Research shaders for compositor ops

Fix slangc warnings
Clear screen to neutral gray
2026-08-09 22:49:26 +01:00 · 2026-08-09 20:46:14 +01:00 · 2026-08-09 20:45:36 +01:00 · 2026-08-09 16:47:12 +01:00 · 2026-08-08 23:50:06 +01:00 · 2026-08-08 23:14:29 +01:00
35 changed files with 2753 additions and 9916 deletions
@@ -234,7 +234,7 @@ WpAllocator scratch = wpMemArenaAllocatorInitZero(KiB(16));

 ## Documentation

-Save research notes and implementation plans as markdown in `documents/`:
+Save research notes, implementation plans and session logs as markdown in `documents/`:

 ```
 documents/
@@ -248,6 +248,9 @@ documents/
    └── YYYY-MM-DD.md
 ```

+At the start of each new session, read the previous session logs to understand what
+we've implemented so far
+
 ## Skills

 Domain-specific conventions are stored as skills in `.opencode/skills/<name>/SKILL.md`.
@@ -0,0 +1,41 @@
+// Prism fullscreen texture blit shader.
+//
+// Draws a selected texture from the bindless array as a fullscreen quad that
+// is letterboxed/pillarboxed to preserve aspect ratio (contain-fit). The NDC
+// content rect is supplied via push constants so the texture is never
+// stretched, squashed, or cropped.
+
+struct BlitData {
+	float4 rect;   // NDC fit rect: x0, y0, x1, y1
+	uint   selected;
+	uint   mode;   // 0 = sample texture, 1 = solid background
+	uint   pad[2];
+};
+
+[[vk::push_constant]]
+BlitData blit;
+
+Sampler2D textures[];
+
+struct VSOutput {
+	float4 Pos : SV_POSITION;
+	float2 UV;
+};
+
+[shader("vertex")]
+VSOutput main(uint vertexIndex : SV_VertexID) {
+	VSOutput output;
+	float2 uv = float2(float(vertexIndex & 1), float((vertexIndex >> 1) & 1));
+	output.UV = uv;
+	float2 pos = lerp(blit.rect.xy, blit.rect.zw, uv);
+	output.Pos = float4(pos, 0.0, 1.0);
+	return output;
+}
+
+[shader("fragment")]
+float4 main(VSOutput input) {
+	if (blit.mode == 1) {
+		return float4(0.18, 0.18, 0.18, 1.0);
+	}
+	return textures[NonUniformResourceIndex(blit.selected)].Sample(input.UV);
+}
@@ -1,61 +0,0 @@
-/* Copyright (c) 2025-2026, Sascha Willems
- *
- * SPDX-License-Identifier: MIT
- *
- */
-
-struct VSInput {
-	float3 Pos;
-	float3 Normal;
-	float2 UV;
-};
-
-Sampler2D textures[];
-
-struct ShaderData {
-	float4x4 projection;
-	float4x4 view;
-	float4x4 model[3];
-	float4 lightPos;
-	uint32_t selected;
-};
-
-struct VSOutput {
-	float4 Pos : SV_POSITION;
-	float3 Normal;
-	float2 UV;
-	float3 Factor;
-	float3 LightVec;
-	float3 ViewVec;
-	uint32_t InstanceIndex;
-};
-
-[shader("vertex")]
-VSOutput main(VSInput input, uniform ShaderData *shaderData, uint instanceIndex : SV_VulkanInstanceID) {
-	VSOutput output;
-	float4x4 modelMat = shaderData->model[instanceIndex];
-	output.Normal = mul((float3x3)mul(shaderData->view, modelMat), input.Normal);
-	output.UV = input.UV;
-	output.Pos = mul(shaderData->projection, mul(shaderData->view, mul(modelMat, float4(input.Pos.xyz, 1.0))));
-	output.Factor = (shaderData->selected == instanceIndex ? 3.0f : 1.0f);
-	output.InstanceIndex = instanceIndex;
-	// Calculate view vectors required for lighting
-	float4 fragPos = mul(mul(shaderData->view, modelMat), float4(input.Pos.xyz, 1.0));
-	output.LightVec = shaderData->lightPos.xyz - fragPos.xyz;
-	output.ViewVec = -fragPos.xyz;
-	return output;
-}
-
-[shader("fragment")]
-float4 main(VSOutput input) {
-	// Phong lighting
-	float3 N = normalize(input.Normal);
-	float3 L = normalize(input.LightVec);
-	float3 V = normalize(input.ViewVec);
-	float3 R = reflect(-L, N);
-	float3 diffuse = max(dot(N, L), 0.0025);
-	float3 specular = pow(max(dot(R, V), 0.0), 16.0) * 0.75;
-	// Sample from texture
-	float3 color = textures[NonUniformResourceIndex(input.InstanceIndex)].Sample(input.UV).rgb * input.Factor;
-	return float4(diffuse * color.rgb + specular, 1.0);
-}
@@ -1,62 +0,0 @@
-# Blender 5.0.1 MTL File: 'suzanne4.blend'
-# www.blender.org
-
-newmtl Material
-Ns 250.000000
-Ka 1.000000 1.000000 1.000000
-Kd 0.800000 0.800000 0.800000
-Ks 0.500000 0.500000 0.500000
-Ke 0.000000 0.000000 0.000000
-Ni 1.500000
-d 1.000000
-illum 2
-
-newmtl Material.001
-Ns 250.000000
-Ka 1.000000 1.000000 1.000000
-Kd 0.127605 0.127605 0.127605
-Ks 0.500000 0.500000 0.500000
-Ke 0.000000 0.000000 0.000000
-Ni 1.500000
-d 1.000000
-illum 2
-
-newmtl Material.002
-Ns 250.000000
-Ka 1.000000 1.000000 1.000000
-Kd 0.000000 0.000000 0.000000
-Ks 0.500000 0.500000 0.500000
-Ke 0.000000 0.000000 0.000000
-Ni 1.500000
-d 1.000000
-illum 2
-
-newmtl Material.003
-Ns 250.000000
-Ka 1.000000 1.000000 1.000000
-Kd 0.800000 0.800000 0.800000
-Ks 0.500000 0.500000 0.500000
-Ke 0.000000 0.000000 0.000000
-Ni 1.500000
-d 1.000000
-illum 2
-
-newmtl Material.004
-Ns 250.000000
-Ka 1.000000 1.000000 1.000000
-Kd 0.800007 0.200800 0.327761
-Ks 0.500000 0.500000 0.500000
-Ke 0.000000 0.000000 0.000000
-Ni 1.500000
-d 1.000000
-illum 2
-
-newmtl Material.005
-Ns 250.000000
-Ka 1.000000 1.000000 1.000000
-Kd 1.000000 1.000000 1.000000
-Ks 0.500000 0.500000 0.500000
-Ke 0.000000 0.000000 0.000000
-Ni 1.500000
-d 1.000000
-illum 2
@@ -0,0 +1,150 @@
+# Plan — Fullscreen Texture Blit with Contain-Fit
+
+## Goal
+
+Render a texture fullscreen with aspect-ratio preservation. If the texture's
+aspect ratio does not match the window's, draw it to fit within the window —
+never stretched, squashed, or cropped. Tall/narrow textures pillarbox (bars on
+left/right); wide textures letterbox (bars on top/bottom).
+
+This replaces the Suzanne mesh demo in `main.cpp`, which was for testing the RHI.
+
+## Fit semantics (contain — never crop)
+
+```
+scale       = min(win_w / tex_w, win_h / tex_h)
+content_w   = tex_w * scale
+content_h   = tex_h * scale
+rect        = centered: left = (win_w - content_w)/2, top = (win_h - content_h)/2
+```
+
+| Texture vs window aspect | Limiting dim | Result            |
+|--------------------------|--------------|-------------------|
+| equal                    | —            | fills exactly     |
+| wider (e.g. 2048x512)    | width        | letterbox (T/B)   |
+| taller (e.g. 512x2048)   | height       | pillarbox (L/R)   |
+
+The fit rect is recomputed per frame from the selected texture's dimensions and
+the current window size, so window resize works without extra handling.
+
+## Changes
+
+### 1. RHI — texture size accessor
+
+Add a value struct and a by-value getter (matches `prRhiGetSurfaceCapabilities`
+pattern):
+
+```c
+typedef struct PrRhiTextureSize {
+	u32 width;
+	u32 height;
+} PrRhiTextureSize;
+
+PrRhiTextureSize prRhiGetTextureSize(PrRhiTexture *texture);
+```
+
+Files: `pr_rhi_types.h`, `pr_rhi.h`, `vulkan/pr_rhi_vk.h`,
+`vulkan/pr_rhi_vk.c`, `vulkan/pr_rhi_vk_aliases.h`.
+
+### 2. Offline shader compilation (drop Slang runtime)
+
+- New `justfile` `shaders` recipe:
+  `slangc -target spirv -profile spirv_1_4 -o build/shaders/blit.spv assets/blit.slang`
+  (entry points auto-detected from `[shader(...)]` attributes).
+  `build` depends on it.
+- `main.cpp` loads `build/shaders/blit.spv` via wapp file I/O
+  (`wpFileOpen` / `wpFileGetLength` / `wpFileRead`) into an arena buffer, then
+  `prRhiCreateShader`. No `slang.h` includes, no runtime compilation.
+- Drop `-lslang` and the `-I .../slang` include from the build.
+
+### 3. `assets/blit.slang`
+
+Push constant block (32 bytes — Slang pads structs to 16-byte alignment, so the
+C++ struct carries explicit `pad[3]` to match):
+
+```hlsl
+struct BlitData {
+	float4 rect;   // NDC fit rect: x0, y0, x1, y1
+	uint   selected;
+	uint   pad[3];
+};
+```
+
+- **VS**: generates a 4-vertex triangle-strip quad from `SV_VertexID` (no vertex
+  buffer), maps UV 0–1 into the NDC rect.
+- **FS**: `textures[NonUniformResourceIndex(selected)].Sample(uv)` — reuses the
+  existing bindless descriptor array.
+
+### 4. `main.cpp` — clean texture viewer
+
+Remove everything mesh-related: tinyobj loading, vertex/index buffers,
+`ShaderData` storage buffers / device addresses, the mesh shader + pipeline,
+mouse orbit, and the mesh draw. Drop `-ltinyobjloader -lglm` from the link.
+Remove unused `assets/shader.slang`, `suzanne.obj`, `suzanne.mtl`.
+
+New flow: RHI init → window/instance/pdev/surface/device/swapchain → load 7
+textures → bindless descriptor set (variable count 7) → load `blit.spv` →
+blit pipeline layout (`VERTEX|FRAGMENT` 32-byte push range) → blit pipeline
+(no vertex input, `TRIANGLE_STRIP`, swapchain color format, no depth,
+`cull NONE`, dynamic viewport/scissor).
+
+Render loop per frame:
+- `compute_fit_rect()` from the selected texture's dims + window size
+- bind blit pipeline + descriptor set, push `BlitData{ rect, selected }`,
+  `prRhiCmdDraw(cb, 4, 1, 0, 0)`
+- `+/-` cycles the selected texture; resize recomputes fit automatically
+
+### 5. Test textures (PIL + `build/bin/toktx`)
+
+Four generated KTX files in `assets/`, loaded alongside the 3 Suzanne textures
+(`texture_count = 7`, explicit path array):
+
+| File            | Size      | Shows                    |
+|-----------------|-----------|--------------------------|
+| `test_square.ktx` | 1024x1024 | bars on both axes        |
+| `test_fill.ktx`   | 1920x1080 | fills the 16:9 window    |
+| `test_wide.ktx`   | 2048x512  | letterbox (T/B)          |
+| `test_tall.ktx`   | 512x2048  | pillarbox (L/R)          |
+
+Each with distinct gradients + a border grid so any stretch/squash is visible.
+Generated with `--genmipmap` for mip-aware sampling.
+
+## Verification
+
+`just build && just run` — each texture fits without crop/stretch, `+/-` cycles,
+window resize keeps fit, no Slang runtime in the binary.
+
+## Verification results (2026-08-08)
+
+Fit behavior confirmed by capturing the window (X11 driver) and sampling pixels:
+
+| Texture             | Window        | Result verified                                |
+|---------------------|---------------|------------------------------------------------|
+| square 1024x1024    | 16:9 wide     | pillarbox — pure-black L/R bars, full height   |
+| test_wide 2048x512  | 16:9 wide     | letterbox — pure-black T/B bars, full width    |
+| test_tall 512x2048  | 16:9 wide     | pillarbox — pure-black L/R bars, full height   |
+| test_fill 1920x1080 | 16:9 wide     | fills exactly — no bars anywhere               |
+| square (resized)    | portrait      | fit recomputed per frame — flips to letterbox  |
+
+Texture cycling (`+/-`, `SDLK_PLUS/KP_PLUS/EQUALS`, `SDLK_MINUS/KP_MINUS`) is a
+straightforward `selected` bump in the key handler; it was reviewed but not
+exercise-tested in the headless verification env (KWin/XWayland drops XTEST
+synthesised keys). The other fit cases were verified by temporarily launching
+each texture as the initial selection.
+
+### Bugs found and fixed during verification
+
+1. **`VK_SUBOPTIMAL_KHR` aborted the app.** `prRhiAcquireNextImageVk` /
+   `prRhiPresentVk` routed `SUBOPTIMAL` into `_checkVk` → `__builtin_trap()`.
+   Both now treat it like `OUT_OF_DATE` (return `PR_RHI_SWAPCHAIN_OUT_OF_DATE`).
+   Triggered immediately under X11/XWayland.
+2. **Swapchain recreate ignored surface extent.** `prRhiRecreateSwapchainVk`
+   hard-coded the passed width/height; on surfaces whose `currentExtent` is
+   meaningful (X11) that mismatched the drawable and re-looped on SUBOPTIMAL.
+   Now queries `vkGetPhysicalDeviceSurfaceCapabilitiesKHR` and falls back to the
+   passed size only when `currentExtent == 0xFFFFFFFF`.
+3. **App used logical window size for the swapchain.** Under HiDPI the drawable
+   differs from `SDL_GetWindowSize` (1920x1080 logical → 2400x1350 drawable at
+   1.25x scale), which is the root cause of #1 under XWayland. main.cpp now uses
+   `SDL_GetWindowSizeInPixels` for swapchain width/height, fit math, viewport
+   and scissor.
@@ -0,0 +1,60 @@
+# Session Log — 2026-08-08
+
+## Fullscreen Texture Viewer — Verification and RHI Fixes
+
+Continuation of the fullscreen-blit plan (`documents/plans/fullscreen-blit.md`),
+which rewrote `main.cpp` from the Suzanne mesh demo into a bindless texture
+viewer with contain-fit. This session visually verified the renderer and fixed
+three real bugs uncovered by that verification.
+
+### Verification method
+
+- Ran the app under the X11 SDL driver (`SDL_VIDEODRIVER=x11`) and captured the
+  window with `xwd -id <window>`, then sampled pixels with ImageMagick
+  (`magick -format "%[pixel:p{x,y}]" info:`). The model cannot view images, so
+  all render checks were programmatic (pure-black bars, centered content).
+- XTEST synthesised keys (`XTestFakeKeyEvent`) are silently dropped by
+  KWin/XWayland (confirmed with `xev`: FocusIn arrives via `_NET_ACTIVE_WINDOW`,
+  KeyPress never does). So texture cycling could not be driven headlessly; fit
+  cases were verified by temporarily making each texture the initial selection.
+
+### Contain-fit verified (pixel-sampled)
+
+| Texture             | Window    | Result                                |
+|---------------------|-----------|---------------------------------------|
+| square 1024x1024    | 16:9      | pillarbox (black L/R bars)            |
+| test_wide 2048x512  | 16:9      | letterbox (black T/B bars)            |
+| test_tall 512x2048  | 16:9      | pillarbox (black L/R bars)            |
+| test_fill 1920x1080 | 16:9      | fills exactly (no bars)               |
+| square, then resized to portrait | portrait | fit recomputed per frame → flips to letterbox |
+
+### Bugs found and fixed
+
+1. **`VK_SUBOPTIMAL_KHR` crashed the app.** `prRhiAcquireNextImageVk` and
+   `prRhiPresentVk` routed SUBOPTIMAL into `_checkVk` → `__builtin_trap()`
+   (SIGILL, caught under X11 immediately). Both now return
+   `PR_RHI_SWAPCHAIN_OUT_OF_DATE` for SUBOPTIMAL, same as OUT_OF_DATE
+   (`pr_rhi_vk.c`).
+2. **Swapchain recreate ignored surface extent.** `prRhiRecreateSwapchainVk`
+   hard-coded the passed width/height. Now queries
+   `vkGetPhysicalDeviceSurfaceCapabilitiesKHR` and falls back to the passed
+   size only when `currentExtent == 0xFFFFFFFF` (matches the initial-create
+   logic).
+3. **App used logical window size for the swapchain.** Under HiDPI the drawable
+   differs from `SDL_GetWindowSize` (1920x1080 logical vs 2400x1350 drawable at
+   1.25x scale on XWayland) — the root cause of #1. main.cpp now uses
+   `SDL_GetWindowSizeInPixels` for swapchain width/height, the fit rect, the
+   viewport, and the scissor.
+
+### CLI arg considered and removed
+
+Added a `--texture N` startup arg to drive the verification, then removed it at
+the user's request (`main()` is back to no-args, `app.selected = 0`). If
+headless key injection is ever needed again, revisit (e.g. `ydotool`/`wtype` on
+Wayland, or a WM on a real X server).
+
+### Notes
+
+- `main.cpp` header comment, `<cstdlib>` include, and plan doc all updated to
+  reflect the removed arg.
+- Native Wayland run still clean after all fixes; `just build` passes.
@@ -0,0 +1,59 @@
+# Session Log — 2026-08-09
+
+## Background colour change (blit shader)
+
+- User requested changing the letterbox/pillarbox background from black to neutral grey.
+- Initial attempt: changed the render pass clear color to `(0.5, 0.5, 0.5, 1.0)`. This
+  triggered the NVIDIA validation layer warning
+  `BestPractices-NVIDIA-ClearColor-NotCompressed` — SRGB fast clears only work
+  with 0.0 or 1.0 on NVIDIA tile-based GPUs.
+- Reverted the clear color and implemented the proper solution: draw a fullscreen
+  grey quad in the fragment shader before the texture quad. The render pass clear
+  stays at 0.0 (fast-compressed).
+- Added `mode` field to `BlitData` push constant. Mode 0 samples the texture, mode
+  1 outputs solid grey.
+- User noted that a branch in the shader is free (no warp divergence since `mode`
+  is uniform per draw call). Agreed — no need for a separate clear pipeline.
+- Changed grey from 0.5 to 0.18 (18% grey card, standard in photography/compositing).
+- Fixed a Slang compilation warning by updating the profile from `spirv_1_4` to
+  `spirv_1_6` and explicitly declaring the required capabilities.
+
+## Shader filter node research
+
+- User requested research on: Gaussian blur, CDL, Laplacian, Sobel, sharpen,
+  posterize, pixelize, Kuwahara.
+- Launched a research agent that produced `documents/research/shader-filters.md`
+  covering all filters with formulas, Slang pseudocode, parameter tables, and
+  performance notes.
+
+## Design decisions made during review
+
+1. **Colour space**: all intermediate textures are linear float
+   (`R16G16B16A16_SFLOAT`, `R32G32B32A32_SFLOAT` for Kuwahara tensor). sRGB images
+   are linearized once at load by the Read node. Final blit to sRGB swapchain
+   handles display encoding.
+
+2. **Alpha**: premultiplied everywhere by default. Explicit Unpremult/Premult
+   nodes for operations that need unpremultiplied values (Nuke model).
+
+3. **Edge handling**: per-node parameter, clamp-to-edge default, clamp-to-border
+   option. Affects sampler state, not shader branches.
+
+4. **Premult has no parameters**: removed the empty push constant struct.
+
+## Research document fixes
+
+- Fixed a contradictory sentence about push constant sizes and CDL block size.
+- Added Unpremult (§9) and Premult (§10) sections with full implementations.
+- Added `edge_mode` field to all 5 spatial filter push constant blocks (Gaussian,
+  Laplacian, Sobel, Sharpen, Kuwahara).
+- Restructured the implications section (§12) into open items vs resolved decisions.
+- Expanded all mathematics sections with plain-language explanations suitable for
+  someone without a strong math background.
+
+## Open items for next session
+
+- Begin implementing the actual shader nodes in Prism
+- Node system needs: per-pass resource signatures, scratch texture hooks, per-node
+  sampler choice, compile-time-bounded loop limits
+- Classic Kuwahara is the recommended first implementation (single pass)
@@ -5,7 +5,6 @@ default: build

 CC       := "clang"
 CXX      := "clang++"
-SLANGC   := "slangc"
 BUILDDIR := "build"

 # Resolve VULKAN_SDK once via backtick
@@ -14,7 +13,7 @@ VENDOR_INC := BUILDDIR + "/include"
 VENDOR_LIB := BUILDDIR + "/lib"

 VK_FLAGS := "-DPR_RHI_VULKAN -DVK_NO_PROTOTYPES -I" + VK_SDK + "/include -I" + VK_SDK + "/include/vma -I" + VENDOR_INC
-APP_INC  := "-I" + VK_SDK + "/include -I" + VK_SDK + "/include/vma -I" + VK_SDK + "/include/slang -I" + VENDOR_INC + " -Isrc"
+APP_INC  := "-I" + VK_SDK + "/include -I" + VK_SDK + "/include/vma -I" + VENDOR_INC + " -Isrc"

 # Build KTX from source
 vendor:
@@ -31,16 +30,19 @@ vendor:
 	cmake --build {{BUILDDIR}}/ktx --config Release
 	cmake --install {{BUILDDIR}}/ktx

-# Compile Slang shaders to SPIR-V
+# Compile shaders from .slang to SPIR-V
 shaders:
-	mkdir -p assets/shaders
-	{{SLANGC}} -target spirv -stage vertex -entry main src/shaders/blit.vert.slang -o assets/shaders/blit.vert.spv
-	{{SLANGC}} -target spirv -stage vertex -entry main src/shaders/blit_to_swap.vert.slang -o assets/shaders/blit_to_swap.vert.spv
-	{{SLANGC}} -target spirv -stage fragment -entry main src/shaders/read.frag.slang -o assets/shaders/read.frag.spv
-	{{SLANGC}} -target spirv -stage fragment -entry main src/shaders/blur.frag.slang -o assets/shaders/blur.frag.spv
-	{{SLANGC}} -target spirv -stage fragment -entry main src/shaders/grade.frag.slang -o assets/shaders/grade.frag.spv
-	{{SLANGC}} -target spirv -stage fragment -entry main src/shaders/blend.frag.slang -o assets/shaders/blend.frag.spv
-	{{SLANGC}} -target spirv -stage fragment -entry main src/shaders/blit_to_swap.frag.slang -o assets/shaders/blit_to_swap.frag.spv
+	mkdir -p {{BUILDDIR}}/shaders
+	{{VK_SDK}}/bin/slangc -target spirv \
+		-profile spirv_1_6+\
+			SPV_GOOGLE_user_type+\
+			spvFragmentFullyCoveredEXT+\
+			spvDerivativeControl+\
+			spvImageQuery+\
+			spvImageGatherExtended+\
+			spvSparseResidency+\
+			spvMinLod \
+		-o {{BUILDDIR}}/shaders/blit.spv assets/blit.slang

 # Build all objects, then link
 build: vendor shaders
@@ -55,11 +57,6 @@ build: vendor shaders
 	bear -a -- {{CC}} -g -c {{VK_FLAGS}} src/prism/rhi/pr_rhi.c -o {{BUILDDIR}}/pr_rhi.o
 	bear -a -- {{CC}} -g -c {{VK_FLAGS}} src/prism/rhi/vulkan/pr_rhi_vk.c -o {{BUILDDIR}}/pr_rhi_vk.o
 	bear -a -- {{CC}} -g -c src/vendor/wapp/wapp.c -o {{BUILDDIR}}/wapp.o
-	bear -a -- {{CC}} -g -c {{VK_FLAGS}} src/prism/allocators/pr_pool_allocator.c -o {{BUILDDIR}}/pr_pool_allocator.o
-	bear -a -- {{CC}} -g -c {{VK_FLAGS}} src/prism/core/pr_graph.c -o {{BUILDDIR}}/pr_graph.o
-	bear -a -- {{CC}} -g -c {{VK_FLAGS}} src/prism/core/pr_node.c -o {{BUILDDIR}}/pr_node.o
-	bear -a -- {{CC}} -g -c {{VK_FLAGS}} src/prism/core/pr_node_eval.c -o {{BUILDDIR}}/pr_node_eval.o
-	bear -a -- {{CC}} -g -c {{VK_FLAGS}} src/prism/core/pr_texture_pool.c -o {{BUILDDIR}}/pr_texture_pool.o
 	bear -a -- {{CXX}} -g -c {{VK_FLAGS}} -Wno-nullability-completeness -DVK_NO_PROTOTYPES \
 		{{APP_INC}} \
 		src/main.cpp \
@@ -1,212 +0,0 @@
-// vim:fileencoding=utf-8:foldmethod=marker
-
-#include "pr_graph.h"
-#include "../../vendor/wapp/wapp.h"
-#include <string.h>
-
-// ---------------------------------------------------------------------------
-// Internal: unlink edge helpers
-// ---------------------------------------------------------------------------
-
-static void _unlinkForward(PrGraph *graph, u64 from_idx, PrGraphEdge *edge) {
-	PrGraphVertex *vtx  = &graph->vertices[from_idx];
-	PrGraphEdge   *curr = vtx->next_forward;
-	PrGraphEdge   *prev = NULL;
-	while (curr) {
-		if (curr == edge) {
-			if (prev) {
-				prev->next_forward = curr->next_forward;
-			} else {
-				vtx->next_forward = curr->next_forward;
-			}
-			return;
-		}
-		prev = curr;
-		curr = curr->next_forward;
-	}
-}
-
-static void _unlinkBackward(PrGraph *graph, u64 to_idx, PrGraphEdge *edge) {
-	PrGraphVertex *vtx  = &graph->vertices[to_idx];
-	PrGraphEdge   *curr = vtx->next_backward;
-	PrGraphEdge   *prev = NULL;
-	while (curr) {
-		if (curr == edge) {
-			if (prev) {
-				prev->next_backward = curr->next_backward;
-			} else {
-				vtx->next_backward = curr->next_backward;
-			}
-			return;
-		}
-		prev = curr;
-		curr = curr->next_backward;
-	}
-}
-
-// ---------------------------------------------------------------------------
-// Graph lifecycle
-// ---------------------------------------------------------------------------
-
-wp_extern void prGraphInit(PrGraph *graph, WpAllocator *allocator, u64 capacity) {
-	memset(graph, 0, sizeof(*graph));
-	graph->capacity = capacity;
-
-	graph->vertices = wpArrayAllocCapacity(PrGraphVertex, allocator, capacity, WP_ARRAY_INIT_FILLED);
-	if (!graph->vertices) {
-		graph->capacity = 0;
-		return;
-	}
-
-	prPoolInit(&graph->edge_pool, sizeof(PrGraphEdge), 64);
-}
-
-wp_extern void prGraphDestroy(PrGraph *graph) {
-	prPoolDestroy(&graph->edge_pool);
-	// vertices are owned by the wapp allocator passed to prGraphInit
-	memset(graph, 0, sizeof(*graph));
-}
-
-// ---------------------------------------------------------------------------
-// Vertex lifecycle
-// ---------------------------------------------------------------------------
-
-wp_extern void prGraphAddVertex(PrGraph *graph, u64 idx) {
-	graph->vertices[idx].active = true;
-	graph->vertex_count++;
-	if (idx >= graph->max_vertex_ever) {
-		graph->max_vertex_ever = idx + 1;
-	}
-}
-
-wp_extern void prGraphRemoveVertex(PrGraph *graph, u64 idx) {
-	PrGraphVertex *vtx = &graph->vertices[idx];
-	if (!vtx->active) { return; }
-
-	// Free outgoing edges: unlink from each target's backward list
-	PrGraphEdge *curr = vtx->next_forward;
-	while (curr) {
-		PrGraphEdge *next = curr->next_forward;
-		_unlinkBackward(graph, curr->target_idx, curr);
-		prPoolFree(&graph->edge_pool, curr);
-		curr = next;
-	}
-
-	// Free incoming edges: unlink from each source's forward list
-	curr = vtx->next_backward;
-	while (curr) {
-		PrGraphEdge *next = curr->next_backward;
-		_unlinkForward(graph, curr->source_idx, curr);
-		prPoolFree(&graph->edge_pool, curr);
-		curr = next;
-	}
-
-	vtx->next_forward  = NULL;
-	vtx->next_backward = NULL;
-	vtx->active        = false;
-	graph->vertex_count--;
-}
-
-// ---------------------------------------------------------------------------
-// Edge management
-// ---------------------------------------------------------------------------
-
-wp_extern b8 prGraphEdgeExists(const PrGraph *graph, u64 from_idx, u64 to_idx) {
-	PrGraphVertex *vtx  = &graph->vertices[from_idx];
-	PrGraphEdge   *curr = vtx->next_forward;
-	while (curr) {
-		if (curr->target_idx == to_idx) { return true; }
-		curr = curr->next_forward;
-	}
-	return false;
-}
-
-wp_extern b8 prGraphAddEdge(PrGraph *graph, u64 from_idx, u64 to_idx) {
-	PrGraphEdge *edge = (PrGraphEdge *)prPoolAlloc(&graph->edge_pool);
-	if (!edge) { return false; }
-
-	edge->source_idx = from_idx;
-	edge->target_idx = to_idx;
-
-	// Link into adjacency chains
-	PrGraphVertex *src    = &graph->vertices[from_idx];
-	PrGraphVertex *dst    = &graph->vertices[to_idx];
-	edge->next_forward     = src->next_forward;
-	edge->next_backward    = dst->next_backward;
-	src->next_forward      = edge;
-	dst->next_backward     = edge;
-
-	// Check whether the new edge created a cycle
-	WpAllocator scratch  = wpMemArenaAllocatorInitZero(KiB(16));
-	WpU64Array  sorted   = prGraphTopologicalSort(graph, &scratch);
-	u64         sorted_n = sorted ? wpArrayCount(sorted) : 0;
-	if (sorted_n < graph->vertex_count) {
-		_unlinkForward(graph, from_idx, edge);
-		_unlinkBackward(graph, to_idx, edge);
-		prPoolFree(&graph->edge_pool, edge);
-		return false;
-	}
-	return true;
-}
-
-wp_extern u64 prGraphVertexCount(const PrGraph *graph) {
-	return graph->vertex_count;
-}
-
-// ---------------------------------------------------------------------------
-// Kahn's algorithm — topological sort / cycle detection
-// ---------------------------------------------------------------------------
-
-wp_extern WpU64Array prGraphTopologicalSort(const PrGraph *graph, const WpAllocator *allocator) {
-	if (graph->vertex_count == 0) { return NULL; }
-	if (!graph->vertices || graph->capacity == 0) { return NULL; }
-
-	WpU64Array result = wpArrayAllocCapacity(u64, allocator, graph->vertex_count, WP_ARRAY_INIT_NONE);
-	if (!result) { return NULL; }
-
-	WpAllocator local_arena = wpMemArenaAllocatorInitZero(KiB(16));
-
-	WpU64Array in_degree = wpArrayAllocCapacity(u64, &local_arena, graph->capacity, WP_ARRAY_INIT_FILLED);
-	if (!in_degree) { return result; }
-	memset(in_degree, 0, wpArrayCapacity(in_degree) * sizeof(u64));
-
-	for (u64 i = 0; i < graph->max_vertex_ever; i++) {
-		if (!graph->vertices[i].active) { continue; }
-
-		PrGraphEdge *curr = graph->vertices[i].next_forward;
-		while (curr) {
-			in_degree[curr->target_idx]++;
-			curr = curr->next_forward;
-		}
-	}
-
-	WpQueue queue = wpQueueAlloc(u64, &local_arena, graph->vertex_count);
-
-	for (u64 i = 0; i < graph->max_vertex_ever; i++) {
-		if (!graph->vertices[i].active) { continue; }
-		if (in_degree[i] == 0) {
-			wpQueuePush(u64, &queue, &i);
-		}
-	}
-
-	while (queue.count > 0) {
-		u64 *node_idx = wpQueuePop(u64, &queue);
-		if (!node_idx) { break; }
-
-		wpArrayAppendCapped(u64, result, node_idx);
-
-		PrGraphEdge *curr = graph->vertices[*node_idx].next_forward;
-		while (curr) {
-			u64 target_idx = curr->target_idx;
-			if (in_degree[target_idx] > 0) {
-				in_degree[target_idx]--;
-				if (in_degree[target_idx] == 0) {
-					wpQueuePush(u64, &queue, &target_idx);
-				}
-			}
-			curr = curr->next_forward;
-		}
-	}
-
-	return result;
-}
@@ -1,63 +0,0 @@
-// vim:fileencoding=utf-8:foldmethod=marker
-
-#ifndef PR_GRAPH_H
-#define PR_GRAPH_H
-
-#include "../../vendor/wapp/common/aliases/aliases.h"
-#include "../../vendor/wapp/base/mem/allocator/mem_allocator.h"
-#include "../../vendor/wapp/base/wapp_base.h"
-#include "../allocators/pr_pool_allocator.h"
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-// ---------------------------------------------------------------------------
-// PrGraphEdge — separately allocated adjacency list node
-// ---------------------------------------------------------------------------
-
-typedef struct PrGraphEdge PrGraphEdge;
-struct PrGraphEdge {
-	PrGraphEdge *next_forward;
-	PrGraphEdge *next_backward;
-	u64          source_idx;
-	u64          target_idx;
-};
-
-// ---------------------------------------------------------------------------
-// PrGraphVertex — compact adjacency head
-// ---------------------------------------------------------------------------
-
-typedef struct PrGraphVertex PrGraphVertex;
-struct PrGraphVertex {
-	PrGraphEdge *next_forward;
-	PrGraphEdge *next_backward;
-	b8           active;
-};
-
-// ---------------------------------------------------------------------------
-// PrGraph — owns topology (edges + adjacency heads)
-// ---------------------------------------------------------------------------
-
-typedef struct {
-	PrPool             edge_pool;
-	PrGraphVertex     *vertices;
-	u64                capacity;
-	u64                max_vertex_ever;
-	u64                vertex_count;
-} PrGraph;
-
-void  prGraphInit(PrGraph *graph, WpAllocator *allocator, u64 capacity);
-void  prGraphDestroy(PrGraph *graph);
-void  prGraphAddVertex(PrGraph *graph, u64 idx);
-void  prGraphRemoveVertex(PrGraph *graph, u64 idx);
-b8    prGraphAddEdge(PrGraph *graph, u64 from_idx, u64 to_idx);
-b8    prGraphEdgeExists(const PrGraph *graph, u64 from_idx, u64 to_idx);
-u64   prGraphVertexCount(const PrGraph *graph);
-WpU64Array prGraphTopologicalSort(const PrGraph *graph, const WpAllocator *allocator);
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif // !PR_GRAPH_H
@@ -1,99 +0,0 @@
-// vim:fileencoding=utf-8:foldmethod=marker
-
-#include "pr_node.h"
-#include "../../vendor/wapp/wapp.h"
-#include <string.h>
-
-// ---------------------------------------------------------------------------
-// Node manager lifecycle
-// ---------------------------------------------------------------------------
-
-wp_extern void prNodeManagerInit(PrNodeManager *mgr, WpAllocator *allocator, u64 capacity) {
-	memset(mgr, 0, sizeof(*mgr));
-	mgr->capacity = capacity;
-
-	mgr->nodes = wpArrayAllocCapacity(PrNode, allocator, capacity, WP_ARRAY_INIT_FILLED);
-	if (!mgr->nodes) {
-		mgr->capacity = 0;
-		return;
-	}
-
-	mgr->free_head = 0;
-	for (u64 i = 0; i < capacity; ++i) {
-		mgr->nodes[i].next_free = i < capacity - 1 ? i + 1 : INVALID_NODE_INDEX;
-	}
-
-	prGraphInit(&mgr->graph, allocator, capacity);
-}
-
-wp_extern void prNodeManagerDestroy(PrNodeManager *mgr) {
-	prGraphDestroy(&mgr->graph);
-	// nodes are owned by the wapp allocator passed to prNodeManagerInit
-	memset(mgr, 0, sizeof(*mgr));
-}
-
-// ---------------------------------------------------------------------------
-// Handle queries
-// ---------------------------------------------------------------------------
-
-wp_extern b8 prNodeManagerIsStaleNode(const PrNodeManager *mgr, PrNodeId id) {
-	u64 generation = mgr->nodes[id.index].generation;
-	return id.generation != generation;
-}
-
-wp_extern b8 prNodeManagerIsActiveNode(const PrNodeManager *mgr, PrNodeId id) {
-	u64 next_free = mgr->nodes[id.index].next_free;
-	return !prNodeManagerIsStaleNode(mgr, id) && next_free == INVALID_NODE_INDEX;
-}
-
-wp_extern PrNodeId prNodeManagerGetNode(const PrNodeManager *mgr, u64 index) {
-	return (PrNodeId){ .index = index, .generation = mgr->nodes[index].generation };
-}
-
-// ---------------------------------------------------------------------------
-// Node lifecycle
-// ---------------------------------------------------------------------------
-
-wp_extern PrNodeId prNodeManagerAddNode(PrNodeManager *mgr, PrNodeType type) {
-	u64 idx = mgr->free_head;
-	if (idx == INVALID_NODE_INDEX) { return INVALID_NODE_ID; }
-
-	PrNode *node = &mgr->nodes[idx];
-
-	mgr->free_head = node->next_free;
-	node->next_free = INVALID_NODE_INDEX;
-	node->type      = type;
-	memset(&node->params, 0, sizeof(node->params));
-
-	mgr->count++;
-	if (idx + 1 > mgr->max_count_ever) { mgr->max_count_ever = idx + 1; }
-
-	prGraphAddVertex(&mgr->graph, idx);
-
-	return (PrNodeId){ .index = idx, .generation = node->generation };
-}
-
-wp_extern void prNodeManagerRemoveNode(PrNodeManager *mgr, PrNodeId id) {
-	if (!prNodeManagerIsActiveNode(mgr, id)) { return; }
-
-	// Tear down all edges incident to this node and mark vertex inactive
-	prGraphRemoveVertex(&mgr->graph, id.index);
-
-	// Return node slot to free list with bumped generation
-	PrNode *node = &mgr->nodes[id.index];
-	node->generation++;
-	node->next_free = mgr->free_head;
-	mgr->free_head  = id.index;
-	mgr->count--;
-}
-
-// ---------------------------------------------------------------------------
-// Edge management
-// ---------------------------------------------------------------------------
-
-wp_extern void prNodeManagerAddEdge(PrNodeManager *mgr, PrNodeId from, PrNodeId to) {
-	if (!prNodeManagerIsActiveNode(mgr, from) || !prNodeManagerIsActiveNode(mgr, to)) { return; }
-	if (from.index == to.index) { return; }
-	if (prGraphEdgeExists(&mgr->graph, from.index, to.index)) { return; }
-	prGraphAddEdge(&mgr->graph, from.index, to.index);
-}
@@ -1,93 +0,0 @@
-// vim:fileencoding=utf-8:foldmethod=marker
-
-#ifndef PR_NODE_H
-#define PR_NODE_H
-
-#include "../../vendor/wapp/common/aliases/aliases.h"
-#include "pr_graph.h"
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-// Forward declarations
-typedef struct PrRhiTexture PrRhiTexture;
-
-// ---------------------------------------------------------------------------
-// Constants
-// ---------------------------------------------------------------------------
-
-#define INVALID_NODE_INDEX (u64)-1
-#define INVALID_NODE_ID    ((PrNodeId){ .index = INVALID_NODE_INDEX, .generation = INVALID_NODE_INDEX })
-
-// ---------------------------------------------------------------------------
-// PrNodeType
-// ---------------------------------------------------------------------------
-
-typedef enum {
-	PR_NODE_TYPE_NONE,
-	PR_NODE_TYPE_READ,
-	PR_NODE_TYPE_BLUR,
-	PR_NODE_TYPE_GRADE,
-	PR_NODE_TYPE_BLEND,
-
-	COUNT_NODE_TYPES
-} PrNodeType;
-
-// ---------------------------------------------------------------------------
-// PrNodeId — generational handle
-// ---------------------------------------------------------------------------
-
-typedef struct {
-	u64 index;
-	u64 generation;
-} PrNodeId;
-
-// ---------------------------------------------------------------------------
-// PrNode — compositor node data
-// ---------------------------------------------------------------------------
-
-typedef struct {
-	union {
-		//WpStr8   path;    // READ: texture path
-		f32      radius;  // BLUR: radius
-		struct {           // GRADE: colour grading
-			f32 gain;
-			f32 offset;
-			f32 power;
-		} grade;
-		u32      mode;    // BLEND: 0=over, 1=under, 2=add
-	} params;
-	PrRhiTexture *texture; // READ: persistent KTX texture
-	PrNodeType    type;
-	u64           generation;
-	u64           next_free;
-} PrNode;
-
-// ---------------------------------------------------------------------------
-// PrNodeManager — owns node data + handle lifecycle + topology
-// ---------------------------------------------------------------------------
-
-typedef struct {
-	PrNode     *nodes;
-	PrGraph     graph;
-	u64         capacity;
-	u64         max_count_ever;
-	u64         count;
-	u64         free_head;
-} PrNodeManager;
-
-void     prNodeManagerInit(PrNodeManager *mgr, WpAllocator *allocator, u64 capacity);
-void     prNodeManagerDestroy(PrNodeManager *mgr);
-b8       prNodeManagerIsStaleNode(const PrNodeManager *mgr, PrNodeId id);
-b8       prNodeManagerIsActiveNode(const PrNodeManager *mgr, PrNodeId id);
-PrNodeId prNodeManagerGetNode(const PrNodeManager *mgr, u64 index);
-PrNodeId prNodeManagerAddNode(PrNodeManager *mgr, PrNodeType type);
-void     prNodeManagerRemoveNode(PrNodeManager *mgr, PrNodeId id);
-void     prNodeManagerAddEdge(PrNodeManager *mgr, PrNodeId from, PrNodeId to);
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif // !PR_NODE_H
@@ -1,358 +0,0 @@
-// vim:fileencoding=utf-8:foldmethod=marker
-
-#include "pr_node_eval.h"
-#include "../rhi/pr_rhi.h"
-#include "../../vendor/wapp/wapp.h"
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-
-wp_intern PrNodeTypeEntry _node_type_table_data[COUNT_NODE_TYPES] = {
-	[PR_NODE_TYPE_READ] = {
-		.type                = PR_NODE_TYPE_READ,
-		.shader_type         = PR_SHADER_TYPE_FRAGMENT,
-		.vertex_shader_path  = "assets/shaders/blit.vert.spv",
-		.fragment_shader_path= "assets/shaders/read.frag.spv",
-		.input_count          = 1,
-		.output_count         = 1,
-		.push_constant_size   = 0,
-	},
-	[PR_NODE_TYPE_BLUR] = {
-		.type                = PR_NODE_TYPE_BLUR,
-		.shader_type         = PR_SHADER_TYPE_FRAGMENT,
-		.vertex_shader_path  = "assets/shaders/blit.vert.spv",
-		.fragment_shader_path= "assets/shaders/blur.frag.spv",
-		.input_count          = 1,
-		.output_count         = 1,
-		.push_constant_size   = sizeof(PrBlurPushConstants),
-	},
-	[PR_NODE_TYPE_GRADE] = {
-		.type                = PR_NODE_TYPE_GRADE,
-		.shader_type         = PR_SHADER_TYPE_FRAGMENT,
-		.vertex_shader_path  = "assets/shaders/blit.vert.spv",
-		.fragment_shader_path= "assets/shaders/grade.frag.spv",
-		.input_count          = 1,
-		.output_count         = 1,
-		.push_constant_size   = sizeof(PrGradePushConstants),
-	},
-	[PR_NODE_TYPE_BLEND] = {
-		.type                = PR_NODE_TYPE_BLEND,
-		.shader_type         = PR_SHADER_TYPE_FRAGMENT,
-		.vertex_shader_path  = "assets/shaders/blit.vert.spv",
-		.fragment_shader_path= "assets/shaders/blend.frag.spv",
-		.input_count          = 2,
-		.output_count         = 1,
-		.push_constant_size   = sizeof(PrBlendPushConstants),
-	},
-};
-
-PrNodeTypeEntry pr_node_type_table[COUNT_NODE_TYPES];
-
-wp_persist PrRhiDescriptorPool *_eval_desc_pool;
-
-wp_intern void *_loadSpirv(const WpAllocator *alloc, const char *path, u64 *out_size) {
-	u64 path_len = strlen(path);
-	WpStr8RO filepath = { path_len, path_len, (c8 *)path };
-	WpFile *f = wpFileOpen(alloc, &filepath, WP_ACCESS_READ);
-	if (!f) {
-		fprintf(stderr, "failed to open SPIR-V: %s\n", path);
-		abort();
-	}
-	i64 file_size = wpFileGetLength(f);
-	if (file_size <= 0) {
-		wpFileClose(f);
-		fprintf(stderr, "empty SPIR-V file: %s\n", path);
-		abort();
-	}
-	void *code = wpMemAllocatorAlloc(alloc, (u64)file_size);
-	if (!code) { wpFileClose(f); abort(); }
-	u64 bytes_read = wpFileRead(code, f, (u64)file_size);
-	wpFileClose(f);
-	if (bytes_read != (u64)file_size) {
-		fprintf(stderr, "short read on SPIR-V: %s\n", path);
-		abort();
-	}
-	*out_size = (u64)file_size;
-	return code;
-}
-
-wp_extern void prNodeEvalInit(PrRhiDevice *device, PrRhiFormat output_format) {
-	(void)output_format;
-	memcpy(pr_node_type_table, _node_type_table_data, sizeof(_node_type_table_data));
-
-	for (u32 i = 0; i < COUNT_NODE_TYPES; ++i) {
-		PrNodeTypeEntry *entry = &pr_node_type_table[i];
-		if (entry->shader_type != PR_SHADER_TYPE_FRAGMENT) { continue; }
-		if (!entry->vertex_shader_path || !entry->fragment_shader_path) { continue; }
-
-		// load SPIR-V
-		u64 vert_size = 0, frag_size = 0;
-		void *vert_code = _loadSpirv(&_G_RHI_CONTEXT.allocator, entry->vertex_shader_path, &vert_size);
-		void *frag_code = _loadSpirv(&_G_RHI_CONTEXT.allocator, entry->fragment_shader_path, &frag_size);
-
-		// create shaders
-		entry->vertex_shader = prRhiCreateShader(device, (PrRhiShaderDesc){
-			.spirv_code = vert_code,
-			.spirv_size = vert_size,
-		});
-		entry->fragment_shader = prRhiCreateShader(device, (PrRhiShaderDesc){
-			.spirv_code = frag_code,
-			.spirv_size = frag_size,
-		});
-
-		// free SPIR-V (now owned by Vulkan)
-		wpMemAllocatorFree(&_G_RHI_CONTEXT.allocator, &vert_code, vert_size);
-		wpMemAllocatorFree(&_G_RHI_CONTEXT.allocator, &frag_code, frag_size);
-
-		// create descriptor set layout
-		PrRhiDescriptorSetLayoutBindingArray bindings = NULL;
-		if (entry->input_count > 0) {
-			bindings = wpArrayWithCapacity(PrRhiDescriptorSetLayoutBinding, 4, WP_ARRAY_INIT_NONE);
-			for (u32 b = 0; b < entry->input_count; ++b) {
-				PrRhiDescriptorSetLayoutBinding binding = {
-					.type             = PR_RHI_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER,
-					.descriptor_count = 1,
-					.stage_flags      = PR_RHI_SHADER_STAGE_FRAGMENT,
-					.binding_flags    = (PrRhiDescriptorBindingFlag)0,
-				};
-				wpArrayAppendCapped(PrRhiDescriptorSetLayoutBinding, bindings, &binding);
-			}
-		}
-		entry->set_layout = prRhiCreateDescriptorSetLayout(device, (PrRhiDescriptorSetLayoutDesc){
-			.bindings = bindings,
-		});
-
-		// create pipeline layout
-		PrRhiPushConstantRange pc_range = {
-			.stage_flags = PR_RHI_SHADER_STAGE_FRAGMENT,
-			.offset      = 0,
-			.size        = entry->push_constant_size,
-		};
-		PrRhiDescriptorSetLayoutArray set_layouts = entry->set_layout
-			? wpArray(PrRhiDescriptorSetLayout *, entry->set_layout)
-			: NULL;
-		PrRhiPushConstantRangeArray pc_ranges = entry->push_constant_size > 0
-			? wpArray(PrRhiPushConstantRange, pc_range)
-			: NULL;
-		entry->pipeline_layout = prRhiCreatePipelineLayout(device, (PrRhiPipelineLayoutDesc){
-			.set_layouts          = set_layouts,
-			.push_constant_ranges = pc_ranges,
-		});
-
-		// create graphics pipeline
-		// pool textures are always RGBA16F
-		PrRhiFormatArray color_formats = wpArray(PrRhiFormat, PR_RHI_FORMAT_R16G16B16A16_SFLOAT);
-		PrRhiColorBlendAttachmentArray blend_attachments = wpArray(PrRhiColorBlendAttachment,
-			((PrRhiColorBlendAttachment){ .color_write_mask = 0xF }));
-		entry->pipeline = prRhiCreateGraphicsPipeline(device, (PrRhiGraphicsPipelineDesc){
-			.vertex_shader           = entry->vertex_shader,
-			.vertex_shader_entry_point = "main",
-			.fragment_shader         = entry->fragment_shader,
-			.fragment_shader_entry_point = "main",
-			.vertex_bindings         = NULL,
-			.vertex_attributes       = NULL,
-			.topology                = PR_RHI_TOPOLOGY_TRIANGLE_LIST,
-			.color_attachment_formats = color_formats,
-			.depth_attachment_format  = PR_RHI_FORMAT_UNDEFINED,
-			.depth_test_enable        = false,
-			.depth_write_enable       = false,
-			.depth_compare_op         = PR_RHI_COMPARE_OP_ALWAYS,
-			.blend_attachments        = blend_attachments,
-			.dynamic_viewport         = true,
-			.dynamic_scissor          = true,
-			.polygon_mode            = PR_RHI_POLYGON_MODE_FILL,
-			.cull_mode               = PR_RHI_CULL_MODE_NONE,
-			.front_face              = PR_RHI_FRONT_FACE_COUNTER_CLOCKWISE,
-			.line_width              = 1.0,
-			.multisample_count       = PR_RHI_SAMPLE_COUNT_1,
-			.layout                  = entry->pipeline_layout,
-		});
-	}
-
-	// create per-frame descriptor pool (reset each frame)
-	PrRhiDescriptorPoolSizeArray pool_sizes = wpArray(PrRhiDescriptorPoolSize,
-		((PrRhiDescriptorPoolSize){ .type = PR_RHI_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, .descriptor_count = 64 }));
-	_eval_desc_pool = prRhiCreateDescriptorPool(device, (PrRhiDescriptorPoolDesc){
-		.max_sets    = 64,
-		.pool_sizes  = pool_sizes,
-	});
-}
-
-wp_extern void prNodeEvalDestroy(PrRhiDevice *device) {
-	if (_eval_desc_pool) {
-		prRhiDestroyDescriptorPool(device, _eval_desc_pool);
-		_eval_desc_pool = NULL;
-	}
-	for (u32 i = 0; i < COUNT_NODE_TYPES; ++i) {
-		PrNodeTypeEntry *entry = &pr_node_type_table[i];
-		if (entry->pipeline) {
-			prRhiDestroyPipeline(device, entry->pipeline);
-			entry->pipeline = NULL;
-		}
-		if (entry->pipeline_layout) {
-			prRhiDestroyPipelineLayout(device, entry->pipeline_layout);
-			entry->pipeline_layout = NULL;
-		}
-		if (entry->set_layout) {
-			prRhiDestroyDescriptorSetLayout(device, entry->set_layout);
-			entry->set_layout = NULL;
-		}
-		if (entry->fragment_shader) {
-			prRhiDestroyShader(device, entry->fragment_shader);
-			entry->fragment_shader = NULL;
-		}
-		if (entry->vertex_shader) {
-			prRhiDestroyShader(device, entry->vertex_shader);
-			entry->vertex_shader = NULL;
-		}
-	}
-}
-
-// ---------------------------------------------------------------------------
-// Per-frame evaluation
-// ---------------------------------------------------------------------------
-
-wp_extern void prGraphEvaluate(PrNodeManager *mgr, PrRhiDevice *device,
-                                PrTexturePool *pool, PrRhiCommandBuffer *cb,
-                                PrRhiSampler *shared_sampler,
-                                PrTextureSlot **out_output) {
-	PrGraph *graph = &mgr->graph;
-	u64 vertex_count = prGraphVertexCount(graph);
-
-	if (out_output) { *out_output = NULL; }
-
-	// 1. topological sort
-	WpAllocator scratch = wpMemArenaAllocatorInitZero(KiB(64));
-	WpU64Array topo = prGraphTopologicalSort(graph, &scratch);
-	u64 topo_count = topo ? wpArrayCount(topo) : 0;
-
-	// 2. compute initial refcounts (out-degree per node)
-	u32 *refcounts = wpMemAllocatorAlloc(&scratch, vertex_count * sizeof(u32));
-	memset(refcounts, 0, vertex_count * sizeof(u32));
-	for (u64 i = 0; i < graph->max_vertex_ever; ++i) {
-		if (!graph->vertices[i].active) { continue; }
-		PrGraphEdge *edge = graph->vertices[i].next_forward;
-		while (edge) {
-			refcounts[i]++;
-			edge = edge->next_forward;
-		}
-	}
-
-	// 3. reset texture pool and descriptor pool
-	prTexturePoolReset(pool);
-	if (_eval_desc_pool) {
-		prRhiResetDescriptorPool(device, _eval_desc_pool);
-	}
-
-	// output slot per node (transient, lives in scratch arena)
-	PrTextureSlot **output_slots = wpMemAllocatorAlloc(&scratch, vertex_count * sizeof(PrTextureSlot *));
-	memset(output_slots, 0, vertex_count * sizeof(PrTextureSlot *));
-
-	// 4. for each node in topological order
-	for (u64 t = 0; t < topo_count; ++t) {
-		u64 node_idx = topo[t];
-		PrNode *node = &mgr->nodes[node_idx];
-		if (node->generation == 0) { continue; } // inactive node
-
-		PrNodeTypeEntry *entry = &pr_node_type_table[node->type];
-
-		// acquire output texture
-		PrTextureSlot *output_slot = prTexturePoolAcquire(pool, device);
-		if (!output_slot) { abort(); }
-
-		// gather input textures (predecessors via backward edges)
-		PrTextureSlot *input_slots[4];
-		u32 input_count = 0;
-		PrGraphEdge *edge = graph->vertices[node_idx].next_backward;
-		while (edge && input_count < 4) {
-			u64 src_idx = edge->source_idx;
-			if (output_slots[src_idx]) {
-				input_slots[input_count++] = output_slots[src_idx];
-			}
-			edge = edge->next_backward;
-		}
-		// READ nodes: use the node's own persistent texture if no edges
-		if (input_count == 0 && node->texture) {
-			input_slots[0] = NULL;
-			input_count = 1;
-		}
-
-		// allocate descriptor set (skip for nodes with no inputs)
-		PrRhiDescriptorSet *desc_set = NULL;
-		if (entry->input_count > 0 && input_count > 0) {
-			desc_set = prRhiAllocateDescriptorSet(device, _eval_desc_pool, entry->set_layout, NULL);
-
-			// build write descriptors
-			PrRhiDescriptorImageInfo image_infos[4];
-			PrRhiWriteDescriptorSet writes[4];
-			for (u32 i = 0; i < input_count; ++i) {
-				PrRhiTexture *tex = input_slots[i] ? input_slots[i]->texture : node->texture;
-				image_infos[i] = (PrRhiDescriptorImageInfo){
-					.texture = tex,
-					.sampler = shared_sampler,
-					.layout  = PR_RHI_LAYOUT_READ_ONLY_OPTIMAL,
-				};
-				writes[i] = (PrRhiWriteDescriptorSet){
-					.dst_set          = desc_set,
-					.dst_binding      = i,
-					.dst_array_element= 0,
-					.type             = PR_RHI_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER,
-					.image_info       = &image_infos[i],
-					.buffer_info      = NULL,
-				};
-			}
-			prRhiUpdateDescriptorSet(device, writes);
-		}
-
-		// record commands
-		PrRhiColorAttachment color_att = {
-			.texture     = output_slot->texture,
-			.layout      = PR_RHI_LAYOUT_ATTACHMENT_OPTIMAL,
-			.clear       = true,
-			.clear_color = {0.0f, 0.0f, 0.0f, 0.0f},
-		};
-		prRhiCmdBeginRendering(cb, &color_att, NULL);
-		prRhiCmdBindPipeline(cb, PR_RHI_PIPELINE_BIND_POINT_GRAPHICS, entry->pipeline);
-		prRhiCmdSetViewport(cb, 0.0f, 0.0f, (f32)pool->width, (f32)pool->height);
-		prRhiCmdSetScissor(cb, 0, 0, pool->width, pool->height);
-
-		if (desc_set) {
-			PrRhiDescriptorSet *sets_arr[1] = { desc_set };
-			prRhiCmdBindDescriptorSets(cb, PR_RHI_PIPELINE_BIND_POINT_GRAPHICS,
-			                            entry->pipeline_layout, 0, sets_arr);
-		}
-
-		// push constants
-		if (entry->push_constant_size > 0) {
-			prRhiCmdPushConstants(cb, entry->pipeline_layout,
-			                      PR_RHI_SHADER_STAGE_FRAGMENT, 0,
-			                      entry->push_constant_size, &node->params);
-		}
-
-		prRhiCmdDraw(cb, 3, 1, 0, 0);
-		prRhiCmdEndRendering(cb);
-
-		// release input textures whose refcount hit 0
-		edge = graph->vertices[node_idx].next_backward;
-		u32 input_idx = 0;
-		while (edge && input_idx < input_count) {
-			u64 src_idx = edge->source_idx;
-			if (refcounts[src_idx] > 0) {
-				refcounts[src_idx]--;
-				if (refcounts[src_idx] == 0) {
-					prTexturePoolRelease(pool, output_slots[src_idx]);
-				}
-			}
-			edge = edge->next_backward;
-			input_idx++;
-		}
-
-		output_slots[node_idx] = output_slot;
-	}
-
-	// Return the last node's output as the compositor output
-	if (out_output && topo_count > 0) {
-		u64 last_idx = topo[topo_count - 1];
-		*out_output = output_slots[last_idx];
-	}
-}
@@ -1,95 +0,0 @@
-// vim:fileencoding=utf-8:foldmethod=marker
-
-#ifndef PR_NODE_EVAL_H
-#define PR_NODE_EVAL_H
-
-#include "../../vendor/wapp/common/aliases/aliases.h"
-#include "../rhi/pr_rhi_types.h"
-#include "pr_node.h"
-#include "pr_texture_pool.h"
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-// ---------------------------------------------------------------------------
-// Shader type
-// ---------------------------------------------------------------------------
-
-typedef enum PrShaderType {
-	PR_SHADER_TYPE_FRAGMENT,    // fullscreen triangle, per-pixel
-	PR_SHADER_TYPE_COMPUTE,     // dispatch, shared memory
-} PrShaderType;
-
-// ---------------------------------------------------------------------------
-// Push constant structs (one per node type)
-// ---------------------------------------------------------------------------
-
-typedef struct {
-	f32 radius;
-} PrBlurPushConstants;
-
-typedef struct {
-	f32 gain;
-	f32 offset;
-	f32 power;
-} PrGradePushConstants;
-
-typedef struct {
-	u32 mode;   // 0=over, 1=under, 2=add
-} PrBlendPushConstants;
-
-// ---------------------------------------------------------------------------
-// Node type entry — maps a node type to its resource signature
-// ---------------------------------------------------------------------------
-
-typedef struct PrNodeTypeEntry {
-	PrNodeType       type;
-	PrShaderType     shader_type;
-
-	// shader paths (pre-compiled SPIR-V, built from .slang via slangc)
-	const char      *vertex_shader_path;   // NULL for compute
-	const char      *fragment_shader_path; // NULL for compute
-	const char      *compute_shader_path;  // NULL for fragment
-
-	// resource signature
-	u32              input_count;   // number of texture inputs
-	u32              output_count;  // always 1 for V1
-
-	// push constant size (bytes)
-	u32              push_constant_size;
-
-	// created at init, cached here
-	PrRhiShader                *vertex_shader;
-	PrRhiShader                *fragment_shader;
-	PrRhiDescriptorSetLayout   *set_layout;
-	PrRhiPipelineLayout        *pipeline_layout;
-	PrRhiPipeline              *pipeline;
-} PrNodeTypeEntry;
-
-// ---------------------------------------------------------------------------
-// Global registry
-// ---------------------------------------------------------------------------
-
-extern PrNodeTypeEntry pr_node_type_table[COUNT_NODE_TYPES];
-
-// ---------------------------------------------------------------------------
-// Evaluation
-// ---------------------------------------------------------------------------
-
-wp_extern void prNodeEvalInit(PrRhiDevice *device, PrRhiFormat output_format);
-wp_extern void prNodeEvalDestroy(PrRhiDevice *device);
-
-// Per-frame graph evaluation. Records commands into cb.
-// pool is reset each frame. desc_pool is reset each frame.
-// out_output receives the final compositor output slot (last node in topo order).
-wp_extern void prGraphEvaluate(PrNodeManager *mgr, PrRhiDevice *device,
-                                PrTexturePool *pool, PrRhiCommandBuffer *cb,
-                                PrRhiSampler *shared_sampler,
-                                PrTextureSlot **out_output);
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif // !PR_NODE_EVAL_H
@@ -1,101 +0,0 @@
-#include "pr_texture_pool.h"
-#include "../rhi/pr_rhi.h"
-#include "../../vendor/wapp/wapp.h"
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-
-wp_intern b8 _growPool(PrTexturePool *pool, PrRhiDevice *device) {
-	u32 old_count = pool->count;
-	u32 new_count = old_count + PR_TEXTURE_POOL_GROWTH_BATCH;
-	if (new_count > pool->max) { new_count = pool->max; }
-	if (old_count >= pool->max) {
-		fprintf(stderr, "texture pool exhausted: %u in use, max %u\n", pool->in_use, pool->max);
-		abort();
-	}
-
-	PrTextureSlot *new_slots = wpArrayAllocCapacity(PrTextureSlot, pool->alloc, new_count, WP_ARRAY_INIT_FILLED);
-	if (!new_slots) { return false; }
-	if (pool->slots) {
-		memcpy(new_slots, pool->slots, old_count * sizeof(PrTextureSlot));
-		wpArrayDealloc(PrTextureSlot, pool->alloc, &pool->slots);
-	}
-	pool->slots = new_slots;
-
-	for (u32 i = old_count; i < new_count; ++i) {
-		PrRhiTextureDesc desc = {
-			.format     = PR_RHI_FORMAT_R16G16B16A16_SFLOAT,
-			.width      = pool->width,
-			.height     = pool->height,
-			.mip_levels = 1,
-			.usage      = PR_RHI_TEXTURE_USAGE_SAMPLED | PR_RHI_TEXTURE_USAGE_COLOR_ATTACHMENT,
-		};
-		PrRhiTexture *tex = prRhiCreateTexture(device, desc);
-		if (!tex) { return false; }
-		pool->slots[i].texture  = tex;
-		pool->slots[i].refcount = 0;
-		pool->slots[i].in_use   = false;
-	}
-	pool->count = new_count;
-	return true;
-}
-
-wp_extern void prTexturePoolInit(PrTexturePool *pool, u32 initial_capacity, u32 max, u32 width, u32 height, const WpAllocator *alloc) {
-	pool->alloc   = alloc;
-	pool->slots   = NULL;
-	pool->count   = 0;
-	pool->in_use  = 0;
-	pool->max     = max;
-	pool->width   = width;
-	pool->height  = height;
-	if (initial_capacity > 0) {
-		pool->slots = wpArrayAllocCapacity(PrTextureSlot, alloc, initial_capacity, WP_ARRAY_INIT_FILLED);
-		if (!pool->slots) {
-			fprintf(stderr, "texture pool initial allocation failed\n");
-			abort();
-		}
-		pool->count = initial_capacity;
-	}
-}
-
-wp_extern void prTexturePoolReset(PrTexturePool *pool) {
-	for (u32 i = 0; i < pool->count; ++i) {
-		pool->slots[i].refcount = 0;
-		pool->slots[i].in_use   = false;
-	}
-	pool->in_use = 0;
-}
-
-wp_extern PrTextureSlot *prTexturePoolAcquire(PrTexturePool *pool, PrRhiDevice *device) {
-	for (u32 i = 0; i < pool->count; ++i) {
-		if (!pool->slots[i].in_use) {
-			pool->slots[i].in_use = true;
-			pool->in_use += 1;
-			return &pool->slots[i];
-		}
-	}
-	if (!_growPool(pool, device)) { return NULL; }
-	PrTextureSlot *slot = &pool->slots[pool->count - 1];
-	slot->in_use = true;
-	pool->in_use += 1;
-	return slot;
-}
-
-wp_extern void prTexturePoolRelease(PrTexturePool *pool, PrTextureSlot *slot) {
-	(void)pool;
-	slot->refcount = 0;
-	slot->in_use   = false;
-	pool->in_use -= 1;
-}
-
-wp_extern void prTexturePoolDestroy(PrTexturePool *pool, PrRhiDevice *device) {
-	for (u32 i = 0; i < pool->count; ++i) {
-		if (pool->slots[i].texture) {
-			prRhiDestroyTexture(device, pool->slots[i].texture);
-		}
-	}
-	if (pool->slots) { wpArrayDealloc(PrTextureSlot, pool->alloc, &pool->slots); }
-	pool->slots  = NULL;
-	pool->count  = 0;
-	pool->in_use = 0;
-}
@@ -1,38 +0,0 @@
-#ifndef PR_TEXTURE_POOL_H
-#define PR_TEXTURE_POOL_H
-
-#include "../rhi/pr_rhi_types.h"
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-#define PR_TEXTURE_POOL_GROWTH_BATCH 8
-
-typedef struct PrTextureSlot {
-	PrRhiTexture *texture;
-	u32           refcount;
-	b8            in_use;
-} PrTextureSlot;
-
-typedef struct PrTexturePool {
-	PrTextureSlot     *slots;
-	const WpAllocator *alloc;
-	u32                count;
-	u32                in_use;
-	u32                max;
-	u32                width;
-	u32                height;
-} PrTexturePool;
-
-wp_extern void prTexturePoolInit(PrTexturePool *pool, u32 initial_capacity, u32 max, u32 width, u32 height, const WpAllocator *alloc);
-wp_extern void prTexturePoolReset(PrTexturePool *pool);
-wp_extern PrTextureSlot *prTexturePoolAcquire(PrTexturePool *pool, PrRhiDevice *device);
-wp_extern void prTexturePoolRelease(PrTexturePool *pool, PrTextureSlot *slot);
-wp_extern void prTexturePoolDestroy(PrTexturePool *pool, PrRhiDevice *device);
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif
@@ -111,6 +111,7 @@ PrRhiTexture *prRhiCreateTexture(PrRhiDevice *device, PrRhiTextureDesc desc);
 PrRhiTexture *prRhiCreateTextureFromKtx(PrRhiDevice *device, const char *path,
                                          PrRhiCommandPool *pool, PrRhiCommandBuffer *cb);
 void          prRhiDestroyTexture(PrRhiDevice *device, PrRhiTexture *texture);
+PrRhiTextureSize prRhiGetTextureSize(PrRhiTexture *texture);

 // ======================================================================
 // Samplers
@@ -352,6 +352,11 @@ typedef struct PrRhiShaderDesc {
 	u64         spirv_size;
 } PrRhiShaderDesc;

+typedef struct PrRhiTextureSize {
+	u32 width;
+	u32 height;
+} PrRhiTextureSize;
+
 typedef struct PrRhiPipelineLayoutDesc {
 	PrRhiDescriptorSetLayoutArray set_layouts;
 	PrRhiPushConstantRangeArray   push_constant_ranges;
@@ -834,7 +834,9 @@ PrRhiSwapchainResult prRhiAcquireNextImageVk(PrRhiDevice *device, PrRhiSwapchain
 	VkSemaphore vk_semaphore = signal_semaphore ? signal_semaphore->handle : VK_NULL_HANDLE;
 	VkResult res = vkAcquireNextImageKHR(device->handle, swapchain->handle, UINT64_MAX, vk_semaphore,
 	                                     VK_NULL_HANDLE, &swapchain->current_image_index);
-	if (res == VK_ERROR_OUT_OF_DATE_KHR) { return PR_RHI_SWAPCHAIN_OUT_OF_DATE; }
+	if (res == VK_ERROR_OUT_OF_DATE_KHR || res == VK_SUBOPTIMAL_KHR) {
+		return PR_RHI_SWAPCHAIN_OUT_OF_DATE;
+	}
 	_checkVk(res, "vkAcquireNextImageKHR");
 	if (out_image_index) { *out_image_index = swapchain->current_image_index; }
 	return PR_RHI_SWAPCHAIN_SUCCESS;
@@ -854,7 +856,9 @@ PrRhiSwapchainResult prRhiPresentVk(PrRhiDevice *device, PrRhiSwapchain *swapcha
 	};

 	VkResult res = vkQueuePresentKHR(device->queue, &present_info);
-	if (res == VK_ERROR_OUT_OF_DATE_KHR) { return PR_RHI_SWAPCHAIN_OUT_OF_DATE; }
+	if (res == VK_ERROR_OUT_OF_DATE_KHR || res == VK_SUBOPTIMAL_KHR) {
+		return PR_RHI_SWAPCHAIN_OUT_OF_DATE;
+	}
 	_checkVk(res, "vkQueuePresentKHR");
 	return PR_RHI_SWAPCHAIN_SUCCESS;
 }
@@ -866,13 +870,22 @@ void prRhiRecreateSwapchainVk(PrRhiDevice *device, PrRhiSwapchain **swapchain,

 	VkDevice vk_device       = device->handle;
 	VkPhysicalDevice vk_pdev = device->physical_device;
+	VkSurfaceKHR vk_surface  = ((PrRhiSurface *)old->surface)->handle;

-	VkExtent2D extent = { width, height };
+	VkSurfaceCapabilitiesKHR caps = {};
+	_checkVk(vkGetPhysicalDeviceSurfaceCapabilitiesKHR(vk_pdev, vk_surface, &caps),
+	         "vkGetPhysicalDeviceSurfaceCapabilitiesKHR");
+
+	VkExtent2D extent = caps.currentExtent;
+	if (extent.width == 0xffffffff) {
+		extent.width  = width;
+		extent.height = height;
+	}

 	VkSwapchainCreateInfoKHR swapchain_info = {
 		.sType            = VK_STRUCTURE_TYPE_SWAPCHAIN_CREATE_INFO_KHR,
 		.oldSwapchain     = old->handle,
-		.surface          = ((PrRhiSurface *)old->surface)->handle,
+		.surface          = vk_surface,
 		.minImageCount    = old->image_count,
 		.imageFormat      = (VkFormat)old->format,
 		.imageColorSpace  = _default_colorspace,
@@ -1315,6 +1328,14 @@ PrRhiTexture *prRhiCreateTextureFromKtxVk(PrRhiDevice *device, const char *path,
 	return texture;
 }

+PrRhiTextureSize prRhiGetTextureSizeVk(PrRhiTexture *texture) {
+	PrRhiTextureSize size = {};
+	if (!texture) { return size; }
+	size.width  = texture->width;
+	size.height = texture->height;
+	return size;
+}
+
 void prRhiDestroyTextureVk(PrRhiDevice *device, PrRhiTexture *texture) {
 	if (!texture) { return; }
 	VkDevice vk_device = device->handle;
@@ -166,6 +166,7 @@ PrRhiTexture *prRhiCreateTextureVk(PrRhiDevice *device, PrRhiTextureDesc desc);
 PrRhiTexture *prRhiCreateTextureFromKtxVk(PrRhiDevice *device, const char *path,
                                            PrRhiCommandPool *pool, PrRhiCommandBuffer *cb);
 void          prRhiDestroyTextureVk(PrRhiDevice *device, PrRhiTexture *texture);
+PrRhiTextureSize prRhiGetTextureSizeVk(PrRhiTexture *texture);

 PrRhiSampler *prRhiCreateSamplerVk(PrRhiDevice *device, PrRhiSamplerDesc desc);
 void          prRhiDestroySamplerVk(PrRhiDevice *device, PrRhiSampler *sampler);
@@ -35,6 +35,7 @@
 #define prRhiCreateTexture                 prRhiCreateTextureVk
 #define prRhiCreateTextureFromKtx          prRhiCreateTextureFromKtxVk
 #define prRhiDestroyTexture                prRhiDestroyTextureVk
+#define prRhiGetTextureSize                prRhiGetTextureSizeVk
 #define prRhiCreateSampler                 prRhiCreateSamplerVk
 #define prRhiDestroySampler                prRhiDestroySamplerVk
 #define prRhiCreateShader                  prRhiCreateShaderVk
@@ -1,44 +0,0 @@
-// BLEND node — composites two textures.
-// 2 input textures, push constant: u32 mode (0=over, 1=under, 2=add).
-
-[[vk::binding(0, 0)]]
-Texture2D<float4> background : register(t0);
-[[vk::binding(1, 0)]]
-Texture2D<float4> foreground : register(t1);
-[[vk::binding(2, 0)]]
-SamplerState input_sampler : register(s0);
-
-struct PushConstants {
-    uint mode;
-};
-
-[[vk::push_constant]]
-PushConstants pc;
-
-struct VSOutput {
-    float4 position : SV_Position;
-    float2 uv       : TEXCOORD0;
-};
-
-float4 main(VSOutput input) : SV_Target {
-    float4 bg = background.Sample(input_sampler, input.uv);
-    float4 fg = foreground.Sample(input_sampler, input.uv);
-
-    float4 result;
-    switch (pc.mode) {
-        case 0: // over: foreground over background
-            result = fg.a * fg + (1.0 - fg.a) * bg;
-            break;
-        case 1: // under: background over foreground
-            result = bg.a * bg + (1.0 - bg.a) * fg;
-            break;
-        case 2: // add: additive blend
-            result = bg + fg;
-            break;
-        default:
-            result = fg;
-            break;
-    }
-
-    return result;
-}
@@ -1,18 +0,0 @@
-// Fullscreen triangle — no vertex buffer needed.
-// Uses gl_VertexIndex to generate a single triangle that covers the viewport.
-
-struct VSOutput {
-    float4 position : SV_Position;
-    float2 uv       : TEXCOORD0;
-};
-
-VSOutput main(uint vertex_id : SV_VertexID) {
-    VSOutput output;
-    // Generate UV from vertex ID (0, 1, 2)
-    output.uv = float2((vertex_id << 1) & 2, vertex_id & 2);
-    // Generate clip-space position
-    output.position = float4(output.uv * 2.0 - 1.0, 0.0, 1.0);
-    // Flip Y for Vulkan
-    output.position.y = -output.position.y;
-    return output;
-}
@@ -1,10 +0,0 @@
-// Blit-to-swapchain fragment shader.
-// Samples the compositor output (RGBA16F pool texture) and writes it
-// to the swapchain color attachment.
-
-[vk::binding(0, 0)] Texture2D<float4>   tex : register(t0);
-[vk::binding(1, 0)] SamplerState         smp : register(s0);
-
-float4 main(float4 position : SV_Position, float2 uv : SV_Target0) : SV_Target0 {
-	return tex.Sample(smp, uv);
-}
@@ -1,29 +0,0 @@
-// Fullscreen triangle — no vertex buffer, no inputs.
-// Draws a single triangle that covers the entire viewport.
-// Reused for all blit / composit passes.
-
-struct VsOut {
-	float4 position : SV_Position;
-	float2 uv       : SV_Target0;
-};
-
-VsOut main(uint vertex_id : SV_VertexID) {
-	// Generate fullscreen triangle from vertex ID.
-	// vertex_id 0 → (-1,-1), 1 → (-1,3), 2 → (3,-1)
-	// UV flips Y so image top maps to screen top.
-	float2 positions[3] = {
-		float2(-1.0, -1.0),
-		float2(-1.0,  3.0),
-		float2( 3.0, -1.0)
-	};
-	float2 uvs[3] = {
-		float2(0.0, 0.0),
-		float2(0.0, 2.0),
-		float2(2.0, 0.0)
-	};
-
-	VsOut output;
-	output.position = float4(positions[vertex_id], 0.0, 1.0);
-	output.uv       = uvs[vertex_id];
-	return output;
-}
@@ -1,40 +0,0 @@
-// BLUR node — Gaussian blur with configurable radius.
-// 1 input texture, push constant: f32 radius.
-
-[[vk::binding(0, 0)]]
-Texture2D<float4> input_texture : register(t0);
-[[vk::binding(1, 0)]]
-SamplerState input_sampler : register(s0);
-
-struct PushConstants {
-    float radius;
-};
-
-[[vk::push_constant]]
-PushConstants pc;
-
-struct VSOutput {
-    float4 position : SV_Position;
-    float2 uv       : TEXCOORD0;
-};
-
-float4 main(VSOutput input) : SV_Target {
-    uint width, height;
-    input_texture.GetDimensions(width, height);
-    float2 texel_size = 1.0 / float2(width, height);
-    float4 result = float4(0.0, 0.0, 0.0, 0.0);
-
-    int radius = int(pc.radius);
-    float weight_sum = 0.0;
-
-    for (int x = -radius; x <= radius; ++x) {
-        for (int y = -radius; y <= radius; ++y) {
-            float2 offset = float2(x, y) * texel_size;
-            float weight = 1.0 / (1.0 + float(x * x + y * y));
-            result += input_texture.Sample(input_sampler, input.uv + offset) * weight;
-            weight_sum += weight;
-        }
-    }
-
-    return result / weight_sum;
-}
@@ -1,31 +0,0 @@
-// GRADE node — colour grading with gain, offset, power.
-// 1 input texture, push constants: f32 gain, f32 offset, f32 power.
-
-[[vk::binding(0, 0)]]
-Texture2D<float4> input_texture : register(t0);
-[[vk::binding(1, 0)]]
-SamplerState input_sampler : register(s0);
-
-struct PushConstants {
-    float gain;
-    float offset;
-    float power;
-};
-
-[[vk::push_constant]]
-PushConstants pc;
-
-struct VSOutput {
-    float4 position : SV_Position;
-    float2 uv       : TEXCOORD0;
-};
-
-float4 main(VSOutput input) : SV_Target {
-    float4 color = input_texture.Sample(input_sampler, input.uv);
-
-    // Apply gain, offset, power per channel
-    color.rgb = color.rgb * pc.gain + pc.offset;
-    color.rgb = pow(max(color.rgb, float3(0.0, 0.0, 0.0)), pc.power);
-
-    return color;
-}
@@ -1,16 +0,0 @@
-// READ node — samples from a persistent KTX texture.
-// No push constants, no inputs (texture loaded separately).
-
-[[vk::binding(0, 0)]]
-Texture2D<float4> input_texture : register(t0);
-[[vk::binding(1, 0)]]
-SamplerState input_sampler : register(s0);
-
-struct VSOutput {
-    float4 position : SV_Position;
-    float2 uv       : TEXCOORD0;
-};
-
-float4 main(VSOutput input) : SV_Target {
-    return input_texture.Sample(input_sampler, input.uv);
-}
Author	SHA1	Message	Date
abdelrahman	8e6f051955	Research shaders for compositor ops	2026-08-09 22:49:26 +01:00
abdelrahman	e59865bff5	Fix slangc warnings	2026-08-09 20:46:14 +01:00
abdelrahman	e206e4647b	Clear screen to neutral gray	2026-08-09 20:45:36 +01:00
abdelrahman	a0b7c0672a	Update AGENTS.md	2026-08-09 16:47:12 +01:00
abdelrahman	3d4f34c531	Session log	2026-08-08 23:50:06 +01:00
abdelrahman	ebd1801883	Test a blit shader implementation	2026-08-08 23:14:29 +01:00
abdelrahman	f5ff6c70ea	Fixes and research	2026-08-08 20:25:25 +01:00
abdelrahman	30408ff244	Revert "First pass at nodes" This reverts commit `618f09689d`.	2026-08-08 20:24:24 +01:00