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[Fix, Test] (TextureUtil, GLImpl): accept GL_STENCIL_INDEX as a stencil-only texture internal format

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swung0x48
2026-08-20 10:49:57 -04:00
parent a8bebe1a3c
commit 042c61fb75
6 changed files with 60 additions and 6 deletions
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MobileGL/MG_Test/Texture/TextureTest.cpp
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@@ -1057,6 +1057,32 @@ TEST_F(TextureTest, TexImage2DAcceptsSpecCompliantFormatCombinations) {
EXPECT_EQ(MG_Impl::GLImpl::GetError(), GL_NO_ERROR);
}
// GL_STENCIL_INDEX is the unsized base format for stencil-only storage, and refusing it as an
// internal format killed the ARB_clear_texture stencil case in its own setup - before it could
// reach the calls it actually tests. The stencil-only transfer format stays paired with
// stencil-only storage in both directions, which is what keeps those clears erroring.
TEST_F(TextureTest, StencilIndexIsATextureInternalFormatPairedOnlyWithStencilStorage) {
GLuint texture = 0;
MG_Impl::GLImpl::GenTextures(1, &texture);
MG_Impl::GLImpl::BindTexture(GL_TEXTURE_2D, texture);
MG_Impl::GLImpl::TexImage2D(GL_TEXTURE_2D, 0, GL_STENCIL_INDEX, 4, 4, 0, GL_STENCIL_INDEX, GL_UNSIGNED_BYTE,
nullptr);
EXPECT_EQ(MG_Impl::GLImpl::GetError(), GL_NO_ERROR);
const auto textureObject = MG_State::pGLContext->GetTextureObject(texture);
ASSERT_NE(textureObject, nullptr);
EXPECT_EQ(textureObject->GetFormat(), TextureInternalFormat::StencilIndex8);
// A colour transfer format against stencil storage is still INVALID_OPERATION, so the clear
// the conformance case makes next fails the way it is supposed to.
MG_Impl::GLImpl::ClearTexImage(texture, 0, GL_RGBA, GL_UNSIGNED_BYTE, nullptr);
ExpectSingleGlError(GL_INVALID_OPERATION);
// ...and the other direction: GL_STENCIL_INDEX against colour storage stays illegal.
MG_Impl::GLImpl::TexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, 4, 4, 0, GL_STENCIL_INDEX, GL_UNSIGNED_BYTE, nullptr);
ExpectSingleGlError(GL_INVALID_OPERATION);
}
// Desktop GL table 3.3 lists GREEN and BLUE as TexImage client formats (GL CTS packed_pixels
// rgba8_format_green/blue upload with them and verify the readback): the single input component
// feeds the named channel, the other color channels default to 0 and alpha to 1.