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Check discarded HD render pass restores presented pixels

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Co-Authored-By: GPT-6.1-Sol <noreply@openai.com>
This commit is contained in:
Shokunin
2026-10-24 14:27:46 -07:00
parent 5cedf7b47c
commit 45544217d8
1 changed files with 27 additions and 0 deletions
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runtime/tests/test_gl_scale_invariance.c
+27
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@@ -773,6 +773,14 @@ static int passes_main(int scale, int window) {
s_interp_source_path = GL_PRES_VRAM;
s_pass_verify = 1;
uint64_t before = fnv(vram, sizeof vram, 0xcbf29ce484222325ull);
int fw = FRAME_W * scale, fh = FRAME_H * scale, ow = 0, oh = 0;
uint32_t *pixels = (uint32_t *)malloc((size_t)fw * fh * 4u);
int count = pixels ? gl_renderer_read_display_hires(0, 0, FRAME_W,
FRAME_H, pixels, fw * fh, &ow, &oh) : 0;
check(count == fw * fh && ow == fw && oh == fh,
"HD pass baseline display readback");
uint64_t frame_before = count == fw * fh
? fnv(pixels, (size_t)fw * fh * 4u, 0xcbf29ce484222325ull) : 0;
int opened = gl_renderer_pass_begin(0, 0, FRAME_W, FRAME_H, 1, 2, 0);
check(opened, "HD pass opens");
if (opened) {
@@ -786,6 +794,25 @@ static int passes_main(int scale, int window) {
check(fnv(vram, sizeof vram, 0xcbf29ce484222325ull) == before,
"HD pass leaves native VRAM identical");
}
opened = gl_renderer_pass_begin(0, 0, FRAME_W, FRAME_H, 1, 2, 0);
check(opened, "HD discard pass opens");
if (opened) {
glb_draw_flat_rect(20, 20, 32, 32, 0x03e0);
flush_flat_batch();
gl_renderer_pass_end(0, 0); /* callback failed: keep no image */
check(gl_renderer_pass_verify_vram(),
"discarded HD pass restores GPU and CPU VRAM");
check(fnv(vram, sizeof vram, 0xcbf29ce484222325ull) == before,
"discarded HD pass preserves authoritative CPU digest");
ow = oh = 0;
count = pixels ? gl_renderer_read_display_hires(0, 0, FRAME_W,
FRAME_H, pixels, fw * fh, &ow, &oh) : 0;
check(count == fw * fh && ow == fw && oh == fh &&
fnv(pixels, (size_t)fw * fh * 4u,
0xcbf29ce484222325ull) == frame_before,
"discarded HD pass restores presented pixel digest");
}
free(pixels);
gl_renderer_set_hd_texture_mode(0);
}
check(glGetError() == GL_NO_ERROR, "GL error");