void affine_operate(affine_stack_t *transforms, affine_operator_t op, void* data) {
affine_par_t* par_iter;
int x, y;
if(transforms->par_next == NULL) {
op(data, transforms->cur);
} else {
affine_stack_t* j = transforms;
while(j != NULL && j->par_next != NULL) {
j->par_cur = j->par_next;
j->par_cur->x_cur = j->par_cur->x_range_min;
j->par_cur->y_cur = j->par_cur->y_range_min;
j = j->prev;
}
while(1) {
affine_t composite = identity;
j = transforms;
while(j != NULL && j->par_cur != NULL) {
composite = affine_compose(j->par_cur->cur, composite);
composite = affine_compose(affine_translate(j->par_cur->x_cur*j->par_cur->x_offset,j->par_cur->y_cur*j->par_cur->y_offset), composite);
j = j->prev;
}
op(data, composite);
j = transforms;
while(j != NULL && j->par_cur != NULL && j->par_cur->par_next == NULL && j->par_cur->x_cur >= j->par_cur->x_range_max && j->par_cur->y_cur >= j->par_cur->y_range_max) {
j->par_cur = j->par_next;
j->par_cur->x_cur = j->par_cur->x_range_min;
j->par_cur->y_cur = j->par_cur->y_range_min;
j = j->prev;
}
if(j == NULL || j->par_next == NULL ) {
j = transforms;
while(j != NULL && j->par_cur != NULL) {
j->par_cur = NULL;
j = j->prev;
}
break;
}
if(j->par_cur->x_cur < j->par_cur->x_range_max) {
j->par_cur->x_cur++;
} else if (j->par_cur->y_cur < j->par_cur->y_range_max) {
j->par_cur->x_cur = j->par_cur->x_range_min;
j->par_cur->y_cur++;
} else {
j->par_cur = j->par_cur->par_next;
j->par_cur->x_cur = j->par_cur->x_range_min;
j->par_cur->y_cur = j->par_cur->y_range_min;
}
}
j = transforms;
while(j != NULL && j->par_cur != NULL) {
j->par_cur = NULL;
j = j->prev;
}
}
}
void render(SDL_Surface* screen)
{
SDL_LockSurface(screen);
unsigned int* pixels = (unsigned int*)screen->pixels;
int x,y;
for (y = 0; y < screen->h; y++)
{
for (x = 0; x < screen->w; x++)
{
pixels[(y * screen->w) + x] = black;
}
}
static float angle = 0.0f;
affine_identity(rast->model_affine);
affine_translate(rast->model_affine, 0.0, 0.0, -4.0, 0.0);
affine_rotate(rast->model_affine, angle, 0.0, 1.0, 0.0, 0.0);
affine_translate(rast->model_affine, 0.0, 0.0, 4.0, 0.0);
if (++angle > 360.0f)
{
angle = 0.0f;
}
//raytrace_scene(screen);
rasteriser_render_triangle(rast, screen, front, 255, 0, 0);
rasteriser_render_triangle(rast, screen, back, 0, 255, 0);
rasteriser_render_triangle(rast, screen, left, 0, 0, 255);
rasteriser_render_triangle(rast, screen, right, 255, 255, 255);
/*
affine_apply(transform, front->a, front->a);
affine_apply(transform, front->b, front->b);
affine_apply(transform, front->c, front->c);
*/
SDL_UnlockSurface(screen);
SDL_UpdateRect(screen, 0, 0, screen->w, screen->h);
}