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Vulkan: Have desktop shaders respect precision qualifiers.

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Sets highp defaults for the appropriate types, for all stages,
and turns on precision qualifiers for non-ES shaders.  Required
fixing some qualifier orders for desktop built-in declarations
for pre-420 shaders.
This commit is contained in:
John Kessenich 2016-08-03 16:41:53 -06:00
parent 4d535640e4
commit 54571c2519
11 changed files with 164 additions and 114 deletions
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40
glslang/MachineIndependent/ParseHelper.cpp
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@ -62,7 +62,7 @@ TParseContext::TParseContext(TSymbolTable& symbolTable, TIntermediate& interm, b
linkage = new TIntermAggregate;
// decide whether precision qualifiers should be ignored or respected
obeyPrecisionQualifiers_ = profile == EEsProfile;
obeyPrecisionQualifiers_ = profile == EEsProfile || spvVersion.vulkan > 0;
setPrecisionDefaults();
globalUniformDefaults.clear();
@ -98,8 +98,11 @@ TParseContext::~TParseContext()
// Intended just as a TParseContext constructor helper.
void TParseContext::setPrecisionDefaults()
{
// set all precision defaults to EpqNone, which is correct for all desktop types
// and for ES types that don't have defaults (thus getting an error on use)
// Set all precision defaults to EpqNone, which is correct for all types
// when not obeying precision qualifiers, and correct for types that don't
// have defaults (thus getting an error on use) when obeying precision
// qualifiers.
for (int type = 0; type < EbtNumTypes; ++type)
defaultPrecision[type] = EpqNone;
@ -108,30 +111,35 @@ void TParseContext::setPrecisionDefaults()
// replace with real precision defaults for those that have them
if (obeyPrecisionQualifiers()) {
TSampler sampler;
sampler.set(EbtFloat, Esd2D);
defaultSamplerPrecision[computeSamplerTypeIndex(sampler)] = EpqLow;
sampler.set(EbtFloat, EsdCube);
defaultSamplerPrecision[computeSamplerTypeIndex(sampler)] = EpqLow;
sampler.set(EbtFloat, Esd2D);
sampler.external = true;
defaultSamplerPrecision[computeSamplerTypeIndex(sampler)] = EpqLow;
if (profile == EEsProfile) {
// Most don't have defaults, a few default to lowp.
TSampler sampler;
sampler.set(EbtFloat, Esd2D);
defaultSamplerPrecision[computeSamplerTypeIndex(sampler)] = EpqLow;
sampler.set(EbtFloat, EsdCube);
defaultSamplerPrecision[computeSamplerTypeIndex(sampler)] = EpqLow;
sampler.set(EbtFloat, Esd2D);
sampler.external = true;
defaultSamplerPrecision[computeSamplerTypeIndex(sampler)] = EpqLow;
} else {
// Non-ES profile
// All default to highp.
for (int type = 0; type < maxSamplerIndex; ++type)
defaultSamplerPrecision[type] = EpqHigh;
}
// If we are parsing built-in computational variables/functions, it is meaningful to record
// whether the built-in has no precision qualifier, as that ambiguity
// is used to resolve the precision from the supplied arguments/operands instead.
// So, we don't actually want to replace EpqNone with a default precision for built-ins.
if (! parsingBuiltins) {
switch (language) {
case EShLangFragment:
if (profile == EEsProfile && language == EShLangFragment) {
defaultPrecision[EbtInt] = EpqMedium;
defaultPrecision[EbtUint] = EpqMedium;
break;
default:
} else {
defaultPrecision[EbtInt] = EpqHigh;
defaultPrecision[EbtUint] = EpqHigh;
defaultPrecision[EbtFloat] = EpqHigh;
break;
}
}