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[Fix, Test] (DirectGLES, TextureUtil): return RGB9_E5 glGetTexImage from the stored words

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swung0x48
2026-08-20 10:14:48 -04:00
parent 52718ecf84
commit 1c0be3e715
4 changed files with 160 additions and 0 deletions
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MobileGL/MG_Test/Texture/TextureTest.cpp
+23
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@@ -3320,6 +3320,29 @@ TEST(SharedExponentRGB9E5Test, RawPackedPixelTransferCoversOnlyIdenticalLayouts)
TexturePixelDataType::UnsignedInt5999Rev));
}
TEST(SharedExponentRGB9E5Test, RedundantPackedEncodingIsRGB9E5Only) {
using MG_Util::PixelStoreProcessor::HasRedundantPackedEncoding;
// This is the predicate that decides whether the CPU shadow has to answer glGetTexImage
// instead of a GPU readback, so it must be as narrow as the defect: only the shared exponent
// has several legal encodings of one value.
EXPECT_TRUE(HasRedundantPackedEncoding(TextureInternalFormat::RGB9E5));
// The other three packed 32-bit layouts round-trip through float32 bit-exactly (each field is
// either an integer or a unique float encoding), so a GPU readback still serves them - which
// matters because RGB10_A2 and R11F_G11F_B10F ARE colour-renderable and their shadow can
// legitimately be stale.
EXPECT_FALSE(HasRedundantPackedEncoding(TextureInternalFormat::RGB10A2));
EXPECT_FALSE(HasRedundantPackedEncoding(TextureInternalFormat::RGB10A2UI));
EXPECT_FALSE(HasRedundantPackedEncoding(TextureInternalFormat::R11FG11FB10F));
// Nothing unpacked qualifies, and neither does an unknown format.
EXPECT_FALSE(HasRedundantPackedEncoding(TextureInternalFormat::RGBA8));
EXPECT_FALSE(HasRedundantPackedEncoding(TextureInternalFormat::RGBA32F));
EXPECT_FALSE(HasRedundantPackedEncoding(TextureInternalFormat::RGB8));
EXPECT_FALSE(HasRedundantPackedEncoding(TextureInternalFormat::Unknown));
}
TEST_F(TextureTest, TexImage2DRGB9E5KeepsNonCanonicalClientWords) {
// Upload direction: GL_RGB / GL_UNSIGNED_INT_5_9_9_9_REV into GL_RGB9_E5 stores the client
// words untouched, including the redundant encodings the CTS generates.