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p5f fm: cover GPU texture writes and view subresources

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swung0x48
2026-09-19 22:29:36 -04:00
parent 277d1a07f0
commit 2abc561721
1 changed files with 78 additions and 0 deletions
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MobileGL/MG_IntegrationTest/Scenarios/F1WireScenario.cpp
+78
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@@ -259,6 +259,84 @@ TEST_F(F1WireScenario, GenerateMipmapDepthPixels) {
EXPECT_NEAR(pixel, 0.375f, 0.00001f);
}
TEST_F(F1WireScenario, PartialTextureUploadPreservesGpuClearPixels) {
if (!Ready()) return;
Attach(GL_RGBA8);
// The client shadow is red. The GPU then changes every texel to green, so
// applying a later one-pixel upload as a whole shadow loses observable data.
std::array<GLubyte, 8 * 8 * 4> red{};
for (size_t i = 0; i < red.size(); i += 4) {
red[i] = 255;
red[i + 3] = 255;
}
glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 8, 8, GL_RGBA, GL_UNSIGNED_BYTE, red.data());
glClearColor(0, 1, 0, 1);
glClear(GL_COLOR_BUFFER_BIT);
const std::array<GLubyte, 4> blue{0, 0, 255, 255};
glTexSubImage2D(GL_TEXTURE_2D, 0, 1, 2, 1, 1, GL_RGBA, GL_UNSIGNED_BYTE, blue.data());
std::array<GLubyte, 8 * 8 * 4> pixels{};
glReadPixels(0, 0, 8, 8, GL_RGBA, GL_UNSIGNED_BYTE, pixels.data());
ASSERT_EQ(FirstGLError(), GLenum(GL_NO_ERROR));
for (int y = 0; y < 8; ++y) {
for (int x = 0; x < 8; ++x) {
const std::array<GLubyte, 4> expected = x == 1 && y == 2
? blue : std::array<GLubyte, 4>{0, 255, 0, 255};
const size_t at = static_cast<size_t>(y * 8 + x) * 4;
const std::array<GLubyte, 4> actual{pixels[at], pixels[at + 1], pixels[at + 2], pixels[at + 3]};
EXPECT_EQ(actual, expected) << "GPU clear survived outside upload at " << x << ", " << y;
}
}
}
TEST_F(F1WireScenario, TextureViewClearTargetsItsRootMipAndLayer) {
if (!Ready()) return;
GLuint root = 0, view = 0;
glGenTextures(1, &root);
glBindTexture(GL_TEXTURE_2D_ARRAY, root);
glTexStorage3D(GL_TEXTURE_2D_ARRAY, 2, GL_RGBA8, 8, 8, 2);
std::array<GLubyte, 8 * 8 * 2 * 4> red{};
for (size_t i = 0; i < red.size(); i += 4) {
red[i] = 255;
red[i + 3] = 255;
}
glTexSubImage3D(GL_TEXTURE_2D_ARRAY, 0, 0, 0, 0, 8, 8, 2,
GL_RGBA, GL_UNSIGNED_BYTE, red.data());
glTexSubImage3D(GL_TEXTURE_2D_ARRAY, 1, 0, 0, 0, 4, 4, 2,
GL_RGBA, GL_UNSIGNED_BYTE, red.data());
std::array<GLubyte, 4 * 4 * 4> blue{};
for (size_t i = 0; i < blue.size(); i += 4) {
blue[i + 2] = 255;
blue[i + 3] = 255;
}
glTexSubImage3D(GL_TEXTURE_2D_ARRAY, 1, 0, 0, 0, 4, 4, 1,
GL_RGBA, GL_UNSIGNED_BYTE, blue.data());
glGenTextures(1, &view);
glTextureView(view, GL_TEXTURE_2D, root, GL_RGBA8, 1, 1, 1, 1);
ASSERT_EQ(FirstGLError(), GLenum(GL_NO_ERROR)) << "view construction";
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, view, 0);
ASSERT_EQ(glCheckFramebufferStatus(GL_FRAMEBUFFER), GLenum(GL_FRAMEBUFFER_COMPLETE));
glClearColor(0, 1, 0, 1);
glClear(GL_COLOR_BUFFER_BIT);
std::array<GLubyte, 4> pixel{};
glReadPixels(1, 2, 1, 1, GL_RGBA, GL_UNSIGNED_BYTE, pixel.data());
EXPECT_EQ(pixel, (std::array<GLubyte, 4>{0, 255, 0, 255})) << "view reads its cleared window";
glFramebufferTextureLayer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, root, 1, 1);
glReadPixels(1, 2, 1, 1, GL_RGBA, GL_UNSIGNED_BYTE, pixel.data());
EXPECT_EQ(pixel, (std::array<GLubyte, 4>{0, 255, 0, 255})) << "view clear reaches root mip 1, layer 1";
glFramebufferTextureLayer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, root, 1, 0);
glReadPixels(1, 2, 1, 1, GL_RGBA, GL_UNSIGNED_BYTE, pixel.data());
EXPECT_EQ(pixel, (std::array<GLubyte, 4>{0, 0, 255, 255})) << "the neighboring root layer is preserved";
glFramebufferTextureLayer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, root, 0, 1);
glReadPixels(1, 2, 1, 1, GL_RGBA, GL_UNSIGNED_BYTE, pixel.data());
EXPECT_EQ(pixel, (std::array<GLubyte, 4>{255, 0, 0, 255})) << "the neighboring root mip is preserved";
EXPECT_EQ(FirstGLError(), GLenum(GL_NO_ERROR));
glFramebufferTexture(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, 0, 0);
glDeleteTextures(1, &view);
glDeleteTextures(1, &root);
}
TEST_F(F1WireScenario, NamedBlitPreservesBindingsAndRestoresNextVerbsPixels) {
if (!Ready()) return;
Attach(GL_RGBA8);