Add ktx

2026-06-14 19:09:18 +01:00
parent 14bd1a9271
commit 13fa90a0e9
3958 changed files with 999286 additions and 4 deletions
@@ -0,0 +1,115 @@
+/* -*- tab-iWidth: 4; -*- */
+/* vi: set sw=2 ts=4 expandtab: */
+
+/*
+ * Copyright 2008 HI Corporation.
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/**
+ * @file
+ * @brief   Shaders used by the DrawTexture and TexturedCube samples.
+ */
+
+#include "GL/glcorearb.h"
+#include "ktx.h"
+
+const GLchar* pszVs =
+"layout(location = 0) in vec4 position;\n"
+"layout(location = 1) in vec4 color;\n"
+"layout(location = 2) in vec4 texcoord;\n\n"
+
+"out vec4 v_color;\n"
+"out vec2 v_texcoord;\n\n"
+
+"uniform highp mat4 mvmatrix;\n"
+"uniform highp mat4 pmatrix;\n\n"
+
+"void main(void)\n"
+"{\n"
+"   mat4 mvpmatrix = pmatrix * mvmatrix;\n"
+"   v_color = color;\n"
+"   v_texcoord = texcoord.xy;\n"
+"   gl_Position = mvpmatrix * position;\n"
+"}";
+
+const GLchar* pszDecalFs =
+"precision mediump float;\n\n"
+
+"uniform sampler2D sampler;\n\n"
+
+"in vec4 v_color;\n"
+"in vec2 v_texcoord;\n"
+"out vec4 fragcolor;\n\n"
+
+"void main(void)\n"
+"{\n"
+"  vec4 color = texture(sampler, v_texcoord);\n"
+"  // DECAL\n"
+"  fragcolor.rgb = v_color.rgb * (1.0f - color.a) + color.rgb * color.a;\n"
+"  // No need for blending with page or screen background.\n"
+"  fragcolor.a = 1.0f;\n"
+"}";
+
+const GLchar* pszColorFs =
+"precision mediump float;\n\n"
+
+"in vec4 v_color;\n"
+"out vec4 fragcolor;\n\n"
+
+"void main(void)\n"
+"{\n"
+"  fragcolor = v_color;\n"
+"}";
+
+// For use when sRGB rendering is not available. Note this is really a
+// workaround for broken GL implementations (most) where "linear" framebuffers
+// are really sRGB framebuffers but since they are "linear" GL does not encode
+// the output of the fs to sRGB so we do it ourselves.
+const GLchar* pszDecalSrgbEncodeFs =
+"precision mediump float;\n\n"
+
+"uniform sampler2D sampler;\n\n"
+
+"in vec4 v_color;\n"
+"in vec2 v_texcoord;\n"
+"out vec4 fragcolor;\n\n"
+
+"vec3 srgb_encode(vec3 color) {\n"
+"   float r = color.r < 0.0031308 ? 12.92 * color.r : 1.055 * pow(color.r, 1.0/2.4) - 0.055;\n"
+"   float g = color.g < 0.0031308 ? 12.92 * color.g : 1.055 * pow(color.g, 1.0/2.4) - 0.055;\n"
+"   float b = color.b < 0.0031308 ? 12.92 * color.b : 1.055 * pow(color.b, 1.0/2.4) - 0.055;\n"
+"   return vec3(r, g, b);\n"
+"}\n\n"
+
+"void main(void)\n"
+"{\n"
+"  vec4 t_color = texture(sampler, v_texcoord);\n"
+"  vec3 lin_fragcolor;\n"
+"  // DECAL\n"
+"  lin_fragcolor = v_color.rgb * (1.0f - t_color.a) + t_color.rgb * t_color.a;\n"
+"  fragcolor.rgb = srgb_encode(lin_fragcolor);\n"
+"  // No need for blending with page or screen background.\n"
+"  fragcolor.a = 1.0f;\n"
+"}";
+
+const GLchar* pszColorSrgbEncodeFs =
+"precision mediump float;\n\n"
+
+"in vec4 v_color;\n"
+"out vec4 fragcolor;\n\n"
+
+"vec3 srgb_encode(vec3 color) {\n"
+"   float r = color.r < 0.0031308 ? 12.92 * color.r : 1.055 * pow(color.r, 1.0/2.4) - 0.055;\n"
+"   float g = color.g < 0.0031308 ? 12.92 * color.g : 1.055 * pow(color.g, 1.0/2.4) - 0.055;\n"
+"   float b = color.b < 0.0031308 ? 12.92 * color.b : 1.055 * pow(color.b, 1.0/2.4) - 0.055;\n"
+"   return vec3(r, g, b);\n"
+"}\n\n"
+
+"void main(void)\n"
+"{\n"
+"  fragcolor.rgb = srgb_encode(v_color.rgb);\n"
+"  fragcolor.a = v_color.a;\n"
+"}";
+
+/* ----------------------------------------------------------------------------- */