ebb5098def
Vulkan specifies that the Sample Mask Test occurs before fragment shading. This means gl_SampleMaskIn should be influenced by both sample-shading and VkPipelineMultisampleStateCreateInfo::pSampleMask. CTS tests dEQP-VK.pipeline.multisample_shader_builtin.* bear this out. For sample-shading, gl_SampleMaskIn should only have a single bit set, Since Metal does not filter for this, apply a bitmask based on gl_SampleID. For a fixed sample mask, since Metal is unaware of VkPipelineMultisampleStateCreateInfo::pSampleMask, we need to ensure that we apply it to both gl_SampleMaskIn and gl_SampleMask. This has the side effect of a redundant application of pSampleMask if the shader already includes gl_SampleMaskIn when setting gl_SampleMask, but I don't see an easy way around this. Also, simplify the logic for including the fixed sample mask in gl_ShaderMask, and print the fixed sample mask as a hex value for readability of bits. |
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| .. | ||
| amd | ||
| asm | ||
| comp | ||
| desktop-only | ||
| flatten | ||
| frag | ||
| intel | ||
| legacy/vert | ||
| masking | ||
| tesc | ||
| tese | ||
| vert | ||
| vulkan | ||