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MSL: Prevent RAW hazards on read_write textures
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@ -8,6 +8,7 @@ using namespace metal;
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static inline __attribute__((always_inline))
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void _main(thread const uint3& id, texture2d<float, access::read_write> TargetTexture)
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{
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TargetTexture.fence();
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float2 loaded = TargetTexture.read(uint2(id.xy)).xy;
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float2 storeTemp = loaded + float2(1.0);
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TargetTexture.write(storeTemp.xyyy, uint2((id.xy + uint2(1u))));
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@ -5,6 +5,7 @@ using namespace metal;
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fragment void main0(texture2d_ms<float> uImageMS [[texture(0)]], texture2d_array<float, access::read_write> uImageArray [[texture(1)]], texture2d<float, access::write> uImage [[texture(2)]])
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{
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uImageArray.fence();
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uImage.write(uImageMS.read(uint2(int2(1, 2)), 2), uint2(int2(2, 3)));
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uImageArray.write(uImageArray.read(uint2(int3(1, 2, 4).xy), uint(int3(1, 2, 4).z)), uint2(int3(2, 3, 7).xy), uint(int3(2, 3, 7).z));
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}
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@ -8,6 +8,7 @@ using namespace metal;
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static inline __attribute__((always_inline))
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void _main(thread const uint3& id, texture2d<float, access::read_write> TargetTexture)
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{
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TargetTexture.fence();
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float2 loaded = TargetTexture.read(uint2(id.xy)).xy;
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float2 storeTemp = loaded + float2(1.0);
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TargetTexture.write(storeTemp.xyyy, uint2((id.xy + uint2(1u))));
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@ -6,6 +6,7 @@ using namespace metal;
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fragment void main0(texture2d_ms<float> uImageMS [[texture(0)]], texture2d_array<float, access::read_write> uImageArray [[texture(1)]], texture2d<float, access::write> uImage [[texture(2)]])
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{
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float4 a = uImageMS.read(uint2(int2(1, 2)), 2);
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uImageArray.fence();
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float4 b = uImageArray.read(uint2(int3(1, 2, 4).xy), uint(int3(1, 2, 4).z));
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uImage.write(a, uint2(int2(2, 3)));
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uImageArray.write(b, uint2(int3(2, 3, 7).xy), uint(int3(2, 3, 7).z));
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@ -8675,9 +8675,9 @@ void CompilerMSL::emit_instruction(const Instruction &instruction)
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// Mark that this shader reads from this image
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uint32_t img_id = ops[2];
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auto &type = expression_type(img_id);
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auto *p_var = maybe_get_backing_variable(img_id);
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if (type.image.dim != DimSubpassData)
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{
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auto *p_var = maybe_get_backing_variable(img_id);
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if (p_var && has_decoration(p_var->self, DecorationNonReadable))
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{
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unset_decoration(p_var->self, DecorationNonReadable);
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@ -8685,6 +8685,10 @@ void CompilerMSL::emit_instruction(const Instruction &instruction)
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}
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}
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// Metal requires explicit fences to break up RAW hazards, even within the same shader invocation
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if (p_var && !has_decoration(p_var->self, DecorationNonWritable))
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statement(to_expression(img_id), ".fence();");
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emit_texture_op(instruction, false);
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break;
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}
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