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.
21 lines
392 B
GLSL
21 lines
392 B
GLSL
#include <metal_stdlib>
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#include <simd/simd.h>
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using namespace metal;
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struct main0_out
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{
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float4 FragColor [[color(0)]];
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uint gl_SampleMask [[sample_mask]];
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};
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fragment main0_out main0(uint gl_SampleMaskIn [[sample_mask]])
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{
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main0_out out = {};
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out.FragColor = float4(1.0);
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out.gl_SampleMask = (gl_SampleMaskIn & 0x22);
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out.gl_SampleMask &= 0x22;
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return out;
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}
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