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[Fix, Test] (GLImpl): record the specific compressed internalformat in TexImage3D and TexStorage3D

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swung0x48
2026-08-20 10:17:55 -04:00
parent 1c0be3e715
commit a9b4c47fea
2 changed files with 103 additions and 0 deletions
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MobileGL/MG_Test/Texture/TextureTest.cpp
+79
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@@ -1651,6 +1651,56 @@ TEST_F(TextureTest, AnUncompressedRespecificationClearsTheCompressedTag) {
EXPECT_EQ(MG_Impl::GLImpl::GetError(), GL_NO_ERROR);
}
// The same rule for the 3D entry points, which never recorded the tag at all. Besides the two
// level queries this decides the level's texel BLOCK SIZE, which glCopyImageSubData compares
// against the other endpoint's - an untagged GL_COMPRESSED_RG_RGTC2 array level measured as the
// RG8 storage it resolves to, 2 bytes instead of 16.
TEST_F(TextureTest, TexImage3DAndTexStorage3DTagASpecificCompressedInternalFormat) {
GLuint texture = 0;
MG_Impl::GLImpl::GenTextures(1, &texture);
MG_Impl::GLImpl::BindTexture(GL_TEXTURE_2D_ARRAY, texture);
MG_Impl::GLImpl::TexImage3D(GL_TEXTURE_2D_ARRAY, 0, GL_COMPRESSED_RG_RGTC2, 8, 8, 2, 0, GL_RG,
GL_UNSIGNED_BYTE, nullptr);
ASSERT_EQ(MG_Impl::GLImpl::GetError(), GL_NO_ERROR);
GLint compressed = GL_FALSE;
MG_Impl::GLImpl::GetTexLevelParameteriv(GL_TEXTURE_2D_ARRAY, 0, GL_TEXTURE_COMPRESSED, &compressed);
EXPECT_EQ(compressed, GL_TRUE);
GLint internalFormat = 0;
MG_Impl::GLImpl::GetTexLevelParameteriv(GL_TEXTURE_2D_ARRAY, 0, GL_TEXTURE_INTERNAL_FORMAT, &internalFormat);
EXPECT_EQ(internalFormat, static_cast<GLint>(GL_COMPRESSED_RG_RGTC2));
// 8x8 in 4x4 blocks of 16 bytes each is 64 bytes a layer, and both layers count.
GLint imageSize = 0;
MG_Impl::GLImpl::GetTexLevelParameteriv(GL_TEXTURE_2D_ARRAY, 0, GL_TEXTURE_COMPRESSED_IMAGE_SIZE, &imageSize);
EXPECT_EQ(imageSize, 128);
EXPECT_EQ(MG_Impl::GLImpl::GetError(), GL_NO_ERROR);
// The texel shadow behind the tag keeps the uncompressed storage the format resolves to.
const auto textureObject = MG_State::pGLContext->GetTextureObject(texture);
ASSERT_NE(textureObject, nullptr);
EXPECT_EQ(textureObject->GetFormat(), TextureInternalFormat::RG8);
MG_Impl::GLImpl::BindTexture(GL_TEXTURE_2D_ARRAY, 0);
// glTexStorage3D has the same gap and the same fix; immutable storage plus
// glCompressedTexSubImage3D is the modern way to upload a compressed array texture.
GLuint storageTexture = 0;
MG_Impl::GLImpl::CreateTextures(GL_TEXTURE_2D_ARRAY, 1, &storageTexture);
MG_Impl::GLImpl::TextureStorage3D(storageTexture, 1, GL_COMPRESSED_RG_RGTC2, 8, 8, 2);
ASSERT_EQ(MG_Impl::GLImpl::GetError(), GL_NO_ERROR);
MG_Impl::GLImpl::BindTexture(GL_TEXTURE_2D_ARRAY, storageTexture);
compressed = GL_FALSE;
MG_Impl::GLImpl::GetTexLevelParameteriv(GL_TEXTURE_2D_ARRAY, 0, GL_TEXTURE_COMPRESSED, &compressed);
EXPECT_EQ(compressed, GL_TRUE);
imageSize = 0;
MG_Impl::GLImpl::GetTexLevelParameteriv(GL_TEXTURE_2D_ARRAY, 0, GL_TEXTURE_COMPRESSED_IMAGE_SIZE, &imageSize);
EXPECT_EQ(imageSize, 128);
EXPECT_EQ(MG_Impl::GLImpl::GetError(), GL_NO_ERROR);
MG_Impl::GLImpl::BindTexture(GL_TEXTURE_2D_ARRAY, 0);
}
namespace {
// A 16x16 RGBA8 texture with exactly `levelCount` levels, defined the way
// KHR-GL43.copy_image.non_existent_mipmap defines its textures - glTexImage2D per
@@ -4511,3 +4561,32 @@ TEST_F(TextureTest, CopyImageSubDataChecksARenderbufferLevelAndStorage) {
EXPECT_FALSE(g_copyImageSubDataCall.Called);
ExpectSingleGlError(GL_INVALID_OPERATION);
}
// A 16-byte RGTC2 block and a 16-byte RGBA32UI texel are in the same size class, so GL 4.6 core
// 18.3.2 requires this copy to succeed. It did not for an ARRAY source: glTexImage3D recorded no
// specific-compressed-format tag, so the level was measured as the 2-byte RG8 storage RGTC2
// resolves to and the compatibility rule saw 2 against 16.
TEST_F(TextureTest, CopyImageSubDataSizesACompressedArrayLevelByItsBlock) {
const ScopedTextureBackendFunctionsOverride backendGuard;
MG_Backend::gBackendFunctionsTable.GL.CopyImageSubData = RecordCopyImageSubData;
g_copyImageSubDataCall = {};
GLuint compressedSource = 0;
MG_Impl::GLImpl::GenTextures(1, &compressedSource);
MG_Impl::GLImpl::BindTexture(GL_TEXTURE_2D_ARRAY, compressedSource);
MG_Impl::GLImpl::TexImage3D(GL_TEXTURE_2D_ARRAY, 0, GL_COMPRESSED_RG_RGTC2, 8, 8, 1, 0, GL_RG,
GL_UNSIGNED_BYTE, nullptr);
MG_Impl::GLImpl::TexParameteri(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_BASE_LEVEL, 0);
MG_Impl::GLImpl::TexParameteri(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_MAX_LEVEL, 0);
MG_Impl::GLImpl::BindTexture(GL_TEXTURE_2D_ARRAY, 0);
GLuint uncompressedDestination = 0;
MG_Impl::GLImpl::CreateTextures(GL_TEXTURE_2D_ARRAY, 1, &uncompressedDestination);
MG_Impl::GLImpl::TextureStorage3D(uncompressedDestination, 1, GL_RGBA32UI, 8, 8, 1);
ASSERT_EQ(MG_Impl::GLImpl::GetError(), GL_NO_ERROR);
MG_Impl::GLImpl::CopyImageSubData(compressedSource, GL_TEXTURE_2D_ARRAY, 0, 0, 0, 0, uncompressedDestination,
GL_TEXTURE_2D_ARRAY, 0, 0, 0, 0, 8, 8, 1);
EXPECT_TRUE(g_copyImageSubDataCall.Called);
EXPECT_EQ(MG_Impl::GLImpl::GetError(), GL_NO_ERROR);
}