SPIRV-Cross/reference/shaders-msl/frag/input-attachment.frag
Chip Davis 4cf840ee7b MSL: Support layered input attachments.
These need to use arrayed texture types, or Metal will complain when
binding the resource. The target layer is addressed relative to the
Layer output by the vertex pipeline, or to the ViewIndex if in a
multiview pipeline. Unlike with the s/t coordinates, Vulkan does not
forbid non-zero layer coordinates here, though this cannot be expressed
in Vulkan GLSL.

Supporting 3D textures will require additional work. Part of the problem
is that Metal does not allow texture views to subset a 3D texture, so we
need some way to pass the base depth to the shader.
2020-09-02 09:18:25 -05:00

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GLSL

#pragma clang diagnostic ignored "-Wmissing-prototypes"
#include <metal_stdlib>
#include <simd/simd.h>
using namespace metal;
struct main0_out
{
float4 FragColor [[color(0)]];
};
static inline __attribute__((always_inline))
float4 load_subpasses(thread const texture2d<float> uInput, thread float4& gl_FragCoord)
{
return uInput.read(uint2(gl_FragCoord.xy));
}
fragment main0_out main0(texture2d<float> uSubpass0 [[texture(0)]], texture2d<float> uSubpass1 [[texture(1)]], float4 gl_FragCoord [[position]])
{
main0_out out = {};
out.FragColor = uSubpass0.read(uint2(gl_FragCoord.xy)) + load_subpasses(uSubpass1, gl_FragCoord);
return out;
}