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Shader: Implemented compound predicates in fsetp. 

You can specify three predicates in an fsetp instruction:

P1 = (Value1 Comp Value2) OP P0;
P2 = !(Value1 Comp Value2) OP P0;
This commit is contained in:
Subv 2018-05-24 17:22:36 -05:00
parent 55e6296e71
commit 126270d963
1 changed files with 55 additions and 19 deletions
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74
src/video_core/renderer_opengl/gl_shader_decompiler.cpp
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@ -597,6 +597,45 @@ private:
return variable;
}
/**
* Returns the comparison string to use to compare two values in the 'set' family of
* instructions.
* @params condition The condition used in the 'set'-family instruction.
* @returns String corresponding to the GLSL operator that matches the desired comparison.
*/
std::string GetPredicateComparison(Tegra::Shader::PredCondition condition) const {
using Tegra::Shader::PredCondition;
static const std::unordered_map<PredCondition, const char*> PredicateComparisonStrings = {
{PredCondition::LessThan, "<"},
{PredCondition::Equal, "=="},
{PredCondition::LessEqual, "<="},
};
auto comparison = PredicateComparisonStrings.find(condition);
ASSERT_MSG(comparison != PredicateComparisonStrings.end(),
"Unknown predicate comparison operation");
return comparison->second;
}
/**
* Returns the operator string to use to combine two predicates in the 'setp' family of
* instructions.
* @params operation The operator used in the 'setp'-family instruction.
* @returns String corresponding to the GLSL operator that matches the desired operator.
*/
std::string GetPredicateCombiner(Tegra::Shader::PredOperation operation) const {
using Tegra::Shader::PredOperation;
static const std::unordered_map<PredOperation, const char*> PredicateOperationStrings = {
{PredOperation::And, "&&"},
{PredOperation::Or, "||"},
{PredOperation::Xor, "^"},
};
auto op = PredicateOperationStrings.find(operation);
ASSERT_MSG(op != PredicateOperationStrings.end(), "Unknown predicate operation");
return op->second;
}
/*
* Returns whether the instruction at the specified offset is a 'sched' instruction.
* Sched instructions always appear before a sequence of 3 instructions.
@ -888,28 +927,25 @@ private:
}
using Tegra::Shader::Pred;
ASSERT_MSG(instr.fsetp.pred0 == static_cast<u64>(Pred::UnusedIndex) &&
instr.fsetp.pred39 == static_cast<u64>(Pred::UnusedIndex),
"Compound predicates are not implemented");
// We can't use the constant predicate as destination.
ASSERT(instr.fsetp.pred3 != static_cast<u64>(Pred::UnusedIndex));
using Tegra::Shader::PredCondition;
switch (instr.fsetp.cond) {
case PredCondition::LessThan:
SetPredicate(instr.fsetp.pred3, '(' + op_a + ") < (" + op_b + ')');
break;
case PredCondition::Equal:
SetPredicate(instr.fsetp.pred3, '(' + op_a + ") == (" + op_b + ')');
break;
case PredCondition::LessEqual:
SetPredicate(instr.fsetp.pred3, '(' + op_a + ") <= (" + op_b + ')');
break;
default:
NGLOG_CRITICAL(HW_GPU, "Unhandled predicate condition: {} (a: {}, b: {})",
static_cast<unsigned>(instr.fsetp.cond.Value()), op_a, op_b);
UNREACHABLE();
std::string second_pred =
GetPredicateCondition(instr.fsetp.pred39, instr.fsetp.neg_pred != 0);
std::string comparator = GetPredicateComparison(instr.fsetp.cond);
std::string combiner = GetPredicateCombiner(instr.fsetp.op);
std::string predicate = '(' + op_a + ") " + comparator + " (" + op_b + ')';
// Set the primary predicate to the result of Predicate OP SecondPredicate
SetPredicate(instr.fsetp.pred3,
'(' + predicate + ") " + combiner + " (" + second_pred + ')');
if (instr.fsetp.pred0 != static_cast<u64>(Pred::UnusedIndex)) {
// Set the secondary predicate to the result of !Predicate OP SecondPredicate, if
// enabled
SetPredicate(instr.fsetp.pred0,
"!(" + predicate + ") " + combiner + " (" + second_pred + ')');
}
break;
}