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VideoCommon: Allow BitfieldExtract in specialized shaders

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This commit is contained in:
Pokechu22
2021-07-26 11:20:04 -07:00
parent 735fd60e52
commit 555a93057c
7 changed files with 33 additions and 39 deletions
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18
Source/Core/VideoCommon/ShaderGenCommon.cpp
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@ -105,6 +105,24 @@ void WriteIsNanHeader(ShaderCode& out, APIType api_type)
}
}
void WriteBitfieldExtractHeader(ShaderCode& out, APIType api_type,
const ShaderHostConfig& host_config)
{
// ==============================================
// BitfieldExtract for APIs which don't have it
// ==============================================
if (!host_config.backend_bitfield)
{
out.Write("uint bitfieldExtract(uint val, int off, int size) {{\n"
" // This built-in function is only supported in OpenGL 4.0+ and ES 3.1+\n"
" // Microsoft's HLSL compiler automatically optimises this to a bitfield extract "
"instruction.\n"
" uint mask = uint((1 << size) - 1);\n"
" return uint(val >> off) & mask;\n"
"}}\n\n");
}
}
static void DefineOutputMember(ShaderCode& object, APIType api_type, std::string_view qualifier,
std::string_view type, std::string_view name, int var_index,
std::string_view semantic = {}, int semantic_index = -1)