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improve z-buffer implementation by removing the oddframe state

This commit is contained in:
opfez 2021-11-23 18:27:42 +01:00
parent cdc427a54b
commit 3324e4f990
1 changed files with 15 additions and 17 deletions
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32
main.c
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@ -17,14 +17,7 @@
#define H 600
#define PI 3.14159265358979323844
int oddframe = 1;
typedef struct {
int bit;
int32_t value;
} zval;
zval zbuffer[W*H] = {0};
int32_t zbuffer[W*H] = {INT32_MIN};
int wireframe = 1;
@ -349,10 +342,9 @@ draw_horizontal_line(
size_t i = x + y * W;
if (zbuffer[i].bit != oddframe || zbuffer[i].value < z) {
if (zbuffer[i] < z) {
canvas[i] = c;
zbuffer[i].value = z;
zbuffer[i].bit = oddframe;
zbuffer[i] = z;
}
}
}
@ -724,8 +716,8 @@ main(void)
/* const mesh iso = load_mesh("resources/iso.mod"); */
/* mesh iso_copy = copy_mesh(iso); */
/* const mesh plane = load_mesh("resources/plane.mod"); */
/* mesh plane_copy = copy_mesh(plane); */
const mesh plane = load_mesh("resources/plane.mod");
mesh plane_copy = copy_mesh(plane);
const mesh monkey = load_mesh("resources/monkey.mod");
mesh monkey_copy = copy_mesh(monkey);
@ -733,6 +725,9 @@ main(void)
scalar rot_speed = 0.6;
for (;;) {
/* clear z-buffer */
for (size_t i = 0; i < W*H; i++) zbuffer[i] = INT32_MIN;
scalar elapsed, start = SDL_GetPerformanceCounter();
mat3x3 rotation = mat3x3_mul(
@ -747,7 +742,11 @@ main(void)
/* iso_copy.vertices[i] = vec3_mat3x3_mul(iso.vertices[i], rotation); */
/* } */
/* draw_mesh(state.canvas, WHITE, cam, plane_copy); */
for (size_t i = 0; i < monkey.vertex_num; i++) {
monkey_copy.vertices[i].y = monkey.vertices[i].y + sin(t*0.01) * 2;
}
draw_mesh(state.canvas, WHITE, cam, plane_copy);
/* draw_mesh(state.canvas, WHITE, cam, iso_copy); */
draw_mesh(state.canvas, WHITE, cam, monkey_copy);
@ -799,14 +798,13 @@ main(void)
SDL_Delay(clamp(16.666f - elapsed, 0, 1000));
t++;
oddframe = !oddframe;
}
quit:
/* free_mesh(iso); */
/* free_mesh(iso_copy); */
/* free_mesh(plane); */
/* free_mesh(plane_copy); */
free_mesh(plane);
free_mesh(plane_copy);
free_mesh(monkey);
free_mesh(monkey_copy);
free_sdl(state);