HLSL: add subpass input types and methods
Add support for Subpass Input proposal of issue #1069.
Subpass input types are given as:
layout(input_attachment_index = 1) SubpassInput<float4> subpass_f;
layout(input_attachment_index = 2) SubpassInput<int4> subpass_i;
layout(input_attachment_index = 3) SubpassInput<uint4> subpass_u;
layout(input_attachment_index = 1) SubpassInputMS<float4> subpass_ms_f;
layout(input_attachment_index = 2) SubpassInputMS<int4> subpass_ms_i;
layout(input_attachment_index = 3) SubpassInputMS<uint4> subpass_ms_u;
The input attachment may also be specified using attribute syntax:
[[vk::input_attachment_index(7)]] SubpassInput subpass_2;
The template type may be a shorter-than-vec4 vector, but currently user
structs are not supported. (An unimplemented error will be issued).
The load operations are methods on objects of the above type:
float4 result = subpass_f.SubpassLoad();
int4 result = subpass_i.SubpassLoad();
uint4 result = subpass_u.SubpassLoad();
float4 result = subpass_ms_f.SubpassLoad(samp);
int4 result = subpass_ms_i.SubpassLoad(samp);
uint4 result = subpass_ms_u.SubpassLoad(samp);
Additionally, the AST printer could not print EOpSubpass* nodes. Now it can.
Fixes #1069
diff --git a/Test/spv.register.subpass.frag b/Test/spv.register.subpass.frag
new file mode 100644
index 0000000..281c2f7
--- /dev/null
+++ b/Test/spv.register.subpass.frag
@@ -0,0 +1,15 @@
+
+// Test binding autoassignment and offset for SubpassInput objects
+
+layout(input_attachment_index = 1) SubpassInput<float4> subpass_f4 : register(t1);
+layout(input_attachment_index = 4) SubpassInputMS<float4> subpass_ms_f4;
+[[vk::input_attachment_index(7)]] SubpassInput subpass_2;
+
+float4 main() : SV_Target0
+{
+ float4 result00 = subpass_f4.SubpassLoad();
+ float4 result10 = subpass_ms_f4.SubpassLoad(3);
+ float4 result73 = subpass_2.SubpassLoad();
+
+ return 0;
+}