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HLSL: add subpass input types and methods

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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
This commit is contained in:
LoopDawg 2017-09-27 09:04:43 -06:00
parent 092b7d2e20
commit 7f93d56ef2
14 changed files with 1136 additions and 16 deletions
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2
hlsl/hlslTokens.h
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@ -273,6 +273,8 @@ enum EHlslTokenClass {
EHTokRWTexture2darray,
EHTokRWTexture3d,
EHTokRWBuffer,
EHTokSubpassInput,
EHTokSubpassInputMS,
// Structure buffer variants
EHTokAppendStructuredBuffer,