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Front-end: Implement 2nd task of issue #400; precision of result and operation.

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From the ES spec + Bugzilla 15931 and GL_KHR_vulkan_glsl:
- Update precision qualifiers for all built-in function prototypes.
- Implement the new algorithm used to distinguish built-in function
  operation precisions from result precisions.
Also add tracking of separate result and operation precisions, and
use that in generating SPIR-V.
(SPIR-V cares about precision of operation, while the front-end
cares about precision of result, for propagation.)
This commit is contained in:
John Kessenich 2016-08-01 19:44:00 -06:00
parent 6c136223ed
commit f6640761c4
18 changed files with 408 additions and 308 deletions
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35
glslang/Include/intermediate.h
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@ -461,6 +461,9 @@ enum TOperator {
EOpTextureQueryLod,
EOpTextureQueryLevels,
EOpTextureQuerySamples,
EOpSamplingGuardBegin,
EOpTexture,
EOpTextureProj,
EOpTextureLod,
@ -503,7 +506,7 @@ enum TOperator {
EOpSparseTextureGradOffsetClamp,
EOpSparseTextureGuardEnd,
EOpSamplingGuardEnd,
EOpTextureGuardEnd,
//
@ -799,11 +802,27 @@ public:
virtual bool promote() { return true; }
bool modifiesState() const;
bool isConstructor() const;
bool isTexture() const { return op > EOpTextureGuardBegin && op < EOpTextureGuardEnd; }
bool isImage() const { return op > EOpImageGuardBegin && op < EOpImageGuardEnd; }
bool isTexture() const { return op > EOpTextureGuardBegin && op < EOpTextureGuardEnd; }
bool isSampling() const { return op > EOpSamplingGuardBegin && op < EOpSamplingGuardEnd; }
bool isImage() const { return op > EOpImageGuardBegin && op < EOpImageGuardEnd; }
bool isSparseTexture() const { return op > EOpSparseTextureGuardBegin && op < EOpSparseTextureGuardEnd; }
bool isSparseImage() const { return op == EOpSparseImageLoad; }
void setOperationPrecision(TPrecisionQualifier p) { operationPrecision = p; }
TPrecisionQualifier getOperationPrecision() const { return operationPrecision != EpqNone ?
operationPrecision :
type.getQualifier().precision; }
TString getCompleteString() const
{
TString cs = type.getCompleteString();
if (getOperationPrecision() != type.getQualifier().precision) {
cs += ", operation at ";
cs += GetPrecisionQualifierString(getOperationPrecision());
}
return cs;
}
// Crack the op into the individual dimensions of texturing operation.
void crackTexture(TSampler sampler, TCrackedTextureOp& cracked) const
{
@ -935,9 +954,15 @@ public:
}
protected:
TIntermOperator(TOperator o) : TIntermTyped(EbtFloat), op(o) {}
TIntermOperator(TOperator o, TType& t) : TIntermTyped(t), op(o) {}
TIntermOperator(TOperator o) : TIntermTyped(EbtFloat), op(o), operationPrecision(EpqNone) {}
TIntermOperator(TOperator o, TType& t) : TIntermTyped(t), op(o), operationPrecision(EpqNone) {}
TOperator op;
// The result precision is in the inherited TType, and is usually meant to be both
// the operation precision and the result precision. However, some more complex things,
// like built-in function calls, distinguish between the two, in which case non-EqpNone
// 'operationPrecision' overrides the result precision as far as operation precision
// is concerned.
TPrecisionQualifier operationPrecision;
};
//