2020-08-28 00:24:20 +00:00
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#pragma clang diagnostic ignored "-Wmissing-prototypes"
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#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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};
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static inline __attribute__((always_inline))
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float4 load_subpasses(thread const texture2d_ms_array<float> uInput, thread uint& gl_SampleID, thread float4& gl_FragCoord, thread uint& gl_ViewIndex)
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{
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float4 _24 = uInput.read(uint2(gl_FragCoord.xy), gl_ViewIndex, gl_SampleID);
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return _24;
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}
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fragment main0_out main0(constant uint* spvViewMask [[buffer(24)]], texture2d_ms_array<float> uSubpass0 [[texture(0)]], texture2d_ms_array<float> uSubpass1 [[texture(1)]], uint gl_SampleID [[sample_id]], float4 gl_FragCoord [[position]], uint gl_ViewIndex [[render_target_array_index]])
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{
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main0_out out = {};
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MSL: Adjust FragCoord for sample-rate shading.
In Metal, the `[[position]]` input to a fragment shader remains at
fragment center, even at sample rate, like OpenGL and Direct3D. In
Vulkan, however, when the fragment shader runs at sample rate, the
`FragCoord` builtin moves to the sample position in the framebuffer,
instead of the fragment center. To account for this difference, adjust
the `FragCoord`, if present, by the sample position. The -0.5 offset is
because the fragment center is at (0.5, 0.5).
Also, add an option to force sample-rate shading in a fragment shader.
Since Metal has no explicit control for this, this is done by adding a
dummy `[[sample_id]]` which is otherwise unused, if none is already
present. This is intended to be used from e.g. MoltenVK when a
pipeline's `minSampleShading` value is nonzero.
Instead of checking if any `Input` variables have `Sample`
interpolation, I've elected to check that the `SampleRateShading`
capability is present. Since `SampleId`, `SamplePosition`, and the
`Sample` interpolation decoration require this cap, this should be
equivalent for any valid SPIR-V module. If this isn't acceptable, let me
know.
2020-11-20 21:41:46 +00:00
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gl_FragCoord.xy += get_sample_position(gl_SampleID) - 0.5;
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2020-08-28 00:24:20 +00:00
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gl_ViewIndex += spvViewMask[0];
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out.FragColor = (uSubpass0.read(uint2(gl_FragCoord.xy), gl_ViewIndex, 1) + uSubpass1.read(uint2(gl_FragCoord.xy), gl_ViewIndex, 2)) + load_subpasses(uSubpass0, gl_SampleID, gl_FragCoord, gl_ViewIndex);
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return out;
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}
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