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HLSL: Implement packoffset production.

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This commit is contained in:
John Kessenich 2016-07-29 13:03:05 -06:00
parent 1936eebe04
commit 82d6baf86f
8 changed files with 147 additions and 77 deletions
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40
hlsl/hlslParseHelper.cpp
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@ -2134,6 +2134,46 @@ void HlslParseContext::handleSemantic(TType& type, const TString& semantic)
type.getQualifier().builtIn = EbvViewportIndex;
}
//
// Handle seeing something like ": packoffset( c[Subcomponent][.component] )"
//
// 'location' has the "c[Subcomponent]" part.
// 'component' points to the "component" part, or nullptr if not present.
//
void HlslParseContext::handlePackOffset(const TSourceLoc& loc, TType& type, const glslang::TString& location,
const glslang::TString* component)
{
if (location.size() == 0 || location[0] != 'c') {
error(loc, "expected 'c'", "packoffset", "");
return;
}
if (location.size() == 1)
return;
if (! isdigit(location[1])) {
error(loc, "expected number after 'c'", "packoffset", "");
return;
}
type.getQualifier().layoutOffset = 16 * atoi(location.substr(1, location.size()).c_str());
if (component) {
int componentOffset = 0;
switch ((*component)[0]) {
case 'x': componentOffset = 0; break;
case 'y': componentOffset = 4; break;
case 'z': componentOffset = 8; break;
case 'w': componentOffset = 12; break;
default:
componentOffset = -1;
break;
}
if (componentOffset < 0 || component->size() > 1) {
error(loc, "expected {x, y, z, w} for component", "packoffset", "");
return;
}
type.getQualifier().layoutOffset += componentOffset;
}
}
//
// Same error message for all places assignments don't work.
//