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[Fix, Test] (GLImpl): make copy-image completeness mipmap-aware per GL 4.6 core 8.17

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swung0x48
2026-08-20 10:20:34 -04:00
parent a9b4c47fea
commit b1774e80be
2 changed files with 141 additions and 1 deletions
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MobileGL/MG_Impl/GLImpl/Texture/GL_Texture.cpp
+32 -1
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@@ -3540,11 +3540,42 @@ namespace MobileGL::MG_Impl::GLImpl {
return false;
}
// Targets with no mip chain have q == level_base by definition (GL 4.6 core 8.17), so no
// minification filter can make them mipmap incomplete - while the shared predicate derives
// q from the base level's size alone and would call a 16x16 multisample image incomplete.
Bool CopyImageTargetHasMipmapChain(TextureTarget target) {
switch (target) {
case TextureTarget::TextureRectangle:
case TextureTarget::TextureBuffer:
case TextureTarget::Texture2DMultisample:
case TextureTarget::Texture2DMultisampleArray:
return false;
default:
return true;
}
}
Bool IsCopyImageEndpointComplete(const MG_Backend::CopyImageEndpoint& endpoint) {
// A renderbuffer is complete exactly when it has storage - there is nothing else it
// could be missing.
if (endpoint.IsRenderbuffer()) return endpoint.Renderbuffer->IsAllocated();
return endpoint.Texture && endpoint.Texture->IsComplete();
const auto* texture = endpoint.Texture.get();
if (!texture) return false;
// 18.3.2 asks for TEXTURE completeness, which GL 4.6 core 8.17 defines to include the
// MIP CHAIN whenever the minification filter samples it - and ITextureObject::
// IsComplete() only answers the storage half (an internal format, and no zero-size
// level in the middle of the chain). A texture with level 0 alone and the default
// NEAREST_MIPMAP_LINEAR filter is incomplete, which is exactly how
// KHR-GL43.copy_image.incomplete_tex builds its subject.
//
// The filter is the texture's OWN: copy-image never goes through a texture unit, so no
// sampler object is in play. An immutable texture is unaffected - glTexStorage clamps
// TEXTURE_MAX_LEVEL to levels-1, which is what makes a single-level immutable texture
// mipmap complete under any filter.
const auto& sampler = texture->GetSamplerObject();
const Bool mipmapped = CopyImageTargetHasMipmapChain(texture->GetTarget()) && sampler &&
sampler->GetMipmapMode() != SamplerMipmapMode::None;
return MG_State::GLState::IsMipmapCompleteForFilter(texture, mipmapped);
}
GLenum GetCopyImageEndpointCompressedFormat(const MG_Backend::CopyImageEndpoint& endpoint,