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Merge pull request #654 from bunnei/cond-exit

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gl_shader_decompiler: Use FlowCondition field in EXIT instruction.
This commit is contained in:
bunnei 2018-07-12 18:59:05 -07:00 committed by GitHub
commit 52636f67cc
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2 changed files with 34 additions and 8 deletions
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9
src/video_core/engines/shader_bytecode.h
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@ -201,6 +201,11 @@ enum class IMinMaxExchange : u64 {
XHi = 3,
};
enum class FlowCondition : u64 {
Always = 0xF,
Fcsm_Tr = 0x1C, // TODO(bunnei): What is this used for?
};
union Instruction {
Instruction& operator=(const Instruction& instr) {
value = instr.value;
@ -315,6 +320,10 @@ union Instruction {
}
} bfe;
union {
BitField<0, 5, FlowCondition> cond;
} flow;
union {
BitField<48, 1, u64> negate_b;
BitField<49, 1, u64> negate_c;

27
src/video_core/renderer_opengl/gl_shader_decompiler.cpp
View file

@ -1639,16 +1639,32 @@ private:
shader.AddLine("color.a = " + regs.GetRegisterAsFloat(3) + ';');
}
switch (instr.flow.cond) {
case Tegra::Shader::FlowCondition::Always:
shader.AddLine("return true;");
if (instr.pred.pred_index == static_cast<u64>(Pred::UnusedIndex)) {
// If this is an unconditional exit then just end processing here, otherwise
// we have to account for the possibility of the condition not being met, so
// continue processing the next instruction.
// If this is an unconditional exit then just end processing here,
// otherwise we have to account for the possibility of the condition
// not being met, so continue processing the next instruction.
offset = PROGRAM_END - 1;
}
break;
case Tegra::Shader::FlowCondition::Fcsm_Tr:
// TODO(bunnei): What is this used for? If we assume this conditon is not
// satisifed, dual vertex shaders in Farming Simulator make more sense
LOG_CRITICAL(HW_GPU, "Skipping unknown FlowCondition::Fcsm_Tr");
break;
default:
LOG_CRITICAL(HW_GPU, "Unhandled flow condition: {}",
static_cast<u32>(instr.flow.cond.Value()));
UNREACHABLE();
}
break;
}
case OpCode::Id::KIL: {
ASSERT(instr.flow.cond == Tegra::Shader::FlowCondition::Always);
shader.AddLine("discard;");
break;
}
@ -1669,8 +1685,9 @@ private:
// can ignore this when generating GLSL code.
break;
}
case OpCode::Id::DEPBAR:
case OpCode::Id::SYNC: {
case OpCode::Id::SYNC:
ASSERT(instr.flow.cond == Tegra::Shader::FlowCondition::Always);
case OpCode::Id::DEPBAR: {
// TODO(Subv): Find out if we actually have to care about these instructions or if
// the GLSL compiler takes care of that for us.
LOG_WARNING(HW_GPU, "DEPBAR/SYNC instruction is stubbed");