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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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21
src/video_core/shader/decode/other.cpp
View file

@ -109,6 +109,27 @@ u32 ShaderIR::DecodeOther(NodeBlock& bb, u32 pc) {
return Operation(OperationCode::WorkGroupIdY);
case SystemVariable::CtaIdZ:
return Operation(OperationCode::WorkGroupIdZ);
case SystemVariable::EqMask:
case SystemVariable::LtMask:
case SystemVariable::LeMask:
case SystemVariable::GtMask:
case SystemVariable::GeMask:
uses_warps = true;
switch (instr.sys20) {
case SystemVariable::EqMask:
return Operation(OperationCode::ThreadEqMask);
case SystemVariable::LtMask:
return Operation(OperationCode::ThreadLtMask);
case SystemVariable::LeMask:
return Operation(OperationCode::ThreadLeMask);
case SystemVariable::GtMask:
return Operation(OperationCode::ThreadGtMask);
case SystemVariable::GeMask:
return Operation(OperationCode::ThreadGeMask);
default:
UNREACHABLE();
return Immediate(0u);
}
default:
UNIMPLEMENTED_MSG("Unhandled system move: {}",
static_cast<u32>(instr.sys20.Value()));

5
src/video_core/shader/node.h
View file

@ -226,6 +226,11 @@ enum class OperationCode {
VoteEqual, /// (bool) -> bool
ThreadId, /// () -> uint
ThreadEqMask, /// () -> uint
ThreadGeMask, /// () -> uint
ThreadGtMask, /// () -> uint
ThreadLeMask, /// () -> uint
ThreadLtMask, /// () -> uint
ShuffleIndexed, /// (uint value, uint index) -> uint
MemoryBarrierGL, /// () -> void