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shader/other: Implement thread comparisons (NV_shader_thread_group)

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Hardware S2R special registers match gl_Thread*MaskNV. We can trivially
implement these using Nvidia's extension on OpenGL or naively stubbing
them with the ARB instructions to match. This might cause issues if the
host device warp size doesn't match Nvidia's. That said, this is
unlikely on proper shaders.

Refer to the attached url for more documentation about these flags.
https://www.khronos.org/registry/OpenGL/extensions/NV/NV_shader_thread_group.txt
This commit is contained in:
ReinUsesLisp
2020-05-15 01:43:44 -03:00
parent cf4ee279c6
commit e2b67a868b
4 changed files with 72 additions and 0 deletions
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23
src/video_core/renderer_opengl/gl_shader_decompiler.cpp
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@ -2309,6 +2309,18 @@ private:
return {"gl_SubGroupInvocationARB", Type::Uint};
}
template <const std::string_view& comparison>
Expression ThreadMask(Operation) {
if (device.HasWarpIntrinsics()) {
return {fmt::format("gl_Thread{}MaskNV", comparison), Type::Uint};
}
if (device.HasShaderBallot()) {
return {fmt::format("uint(gl_SubGroup{}MaskARB)", comparison), Type::Uint};
}
LOG_ERROR(Render_OpenGL, "Thread mask intrinsics are required by the shader");
return {"0U", Type::Uint};
}
Expression ShuffleIndexed(Operation operation) {
std::string value = VisitOperand(operation, 0).AsFloat();
@ -2337,6 +2349,12 @@ private:
static constexpr std::string_view NotEqual = "!=";
static constexpr std::string_view GreaterEqual = ">=";
static constexpr std::string_view Eq = "Eq";
static constexpr std::string_view Ge = "Ge";
static constexpr std::string_view Gt = "Gt";
static constexpr std::string_view Le = "Le";
static constexpr std::string_view Lt = "Lt";
static constexpr std::string_view Add = "Add";
static constexpr std::string_view Min = "Min";
static constexpr std::string_view Max = "Max";
@ -2554,6 +2572,11 @@ private:
&GLSLDecompiler::VoteEqual,
&GLSLDecompiler::ThreadId,
&GLSLDecompiler::ThreadMask<Func::Eq>,
&GLSLDecompiler::ThreadMask<Func::Ge>,
&GLSLDecompiler::ThreadMask<Func::Gt>,
&GLSLDecompiler::ThreadMask<Func::Le>,
&GLSLDecompiler::ThreadMask<Func::Lt>,
&GLSLDecompiler::ShuffleIndexed,
&GLSLDecompiler::MemoryBarrierGL,