abdelrahman/cg-from-scratch
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Projection equation and first cube

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Abdelrahman Said
2024-06-29 17:11:31 +01:00
parent 6dc609be14
commit f922980232
7 changed files with 107 additions and 19 deletions
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74
src/rasteriser/main.c
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@@ -1,3 +1,4 @@
#include "camera/camera.h"
#include "mem_arena.h"
#include "mem_utils.h"
#include "misc/misc_utils.h"
@@ -11,6 +12,12 @@
int main(void) {
colour_t bg =
(colour_t){.rgba.r = 27, .rgba.g = 38, .rgba.b = 79, .rgba.a = 255};
camera_t camera = {
.position = {.x = 0.0f, .y = 0.0f, .z = 0.0f},
.rotation = {.x = 0.0f, .y = 0.0f, .z = 0.0f},
};
vec3f_t viewport = {.x = 1.0f, .y = 1.0f, .z = 1.0f};
window_t window = {0};
if (!init_window(&window, 800, 800, "CG From Scratch Rasteriser")) {
@@ -25,14 +32,47 @@ int main(void) {
// i32 h_min = ((i32)window.half_height) * -1;
// i32 h_max = (i32)window.half_height;
triangle_t triangle = {
.p0 = {-200, -250},
.p1 = {200, 50},
.p2 = {20, 250},
.h0 = 0,
.h1 = 0,
.h2 = 1,
};
// The four "front" vertices
vec3f_t vAf = {-2, -0.5, 5};
vec3f_t vBf = {-2, 0.5, 5};
vec3f_t vCf = {-1, 0.5, 5};
vec3f_t vDf = {-1, -0.5, 5};
// The four "back" vertices
vec3f_t vAb = {-2, -0.5, 6};
vec3f_t vBb = {-2, 0.5, 6};
vec3f_t vCb = {-1, 0.5, 6};
vec3f_t vDb = {-1, -0.5, 6};
// The front face
line_t lABf = {project_point(vAf, &window, &camera, viewport),
project_point(vBf, &window, &camera, viewport)};
line_t lBCf = {project_point(vBf, &window, &camera, viewport),
project_point(vCf, &window, &camera, viewport)};
line_t lCDf = {project_point(vCf, &window, &camera, viewport),
project_point(vDf, &window, &camera, viewport)};
line_t lDAf = {project_point(vDf, &window, &camera, viewport),
project_point(vAf, &window, &camera, viewport)};
// The back face
line_t lABb = {project_point(vAb, &window, &camera, viewport),
project_point(vBb, &window, &camera, viewport)};
line_t lBCb = {project_point(vBb, &window, &camera, viewport),
project_point(vCb, &window, &camera, viewport)};
line_t lCDb = {project_point(vCb, &window, &camera, viewport),
project_point(vDb, &window, &camera, viewport)};
line_t lDAb = {project_point(vDb, &window, &camera, viewport),
project_point(vAb, &window, &camera, viewport)};
// The front-to-back edges
line_t lABfb = {project_point(vAf, &window, &camera, viewport),
project_point(vAb, &window, &camera, viewport)};
line_t lBCfb = {project_point(vBf, &window, &camera, viewport),
project_point(vBb, &window, &camera, viewport)};
line_t lCDfb = {project_point(vCf, &window, &camera, viewport),
project_point(vCb, &window, &camera, viewport)};
line_t lDAfb = {project_point(vDf, &window, &camera, viewport),
project_point(vDb, &window, &camera, viewport)};
Arena *arena = NULL;
u64 capacity = 10ull * 1024ull * 1024ull * 1024ull;
@@ -51,10 +91,20 @@ int main(void) {
clear_window(&window, bg);
draw_shaded_triangle(&window, arena, triangle,
(colour_t){.colour = 0x00ff00ff});
draw_wireframe_triangle(&window, arena, triangle,
(colour_t){.colour = 0xff008aff});
draw_line(&window, arena, lABf, (colour_t){.colour = 0xffaa00ff});
draw_line(&window, arena, lBCf, (colour_t){.colour = 0xffaa00ff});
draw_line(&window, arena, lCDf, (colour_t){.colour = 0xffaa00ff});
draw_line(&window, arena, lDAf, (colour_t){.colour = 0xffaa00ff});
draw_line(&window, arena, lABb, (colour_t){.colour = 0x00ffaaff});
draw_line(&window, arena, lBCb, (colour_t){.colour = 0x00ffaaff});
draw_line(&window, arena, lCDb, (colour_t){.colour = 0x00ffaaff});
draw_line(&window, arena, lDAb, (colour_t){.colour = 0x00ffaaff});
draw_line(&window, arena, lABfb, (colour_t){.colour = 0xee0099ff});
draw_line(&window, arena, lBCfb, (colour_t){.colour = 0xee0099ff});
draw_line(&window, arena, lCDfb, (colour_t){.colour = 0xee0099ff});
draw_line(&window, arena, lDAfb, (colour_t){.colour = 0xee0099ff});
swap_buffers(&window);