BeeEngine/glslang-zig
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

SPV: Reduce spurious type generation by removing intermediate types in the middle of access chains.

Browse source 
This generally simplifies access chain generation, with far fewer  type conversions.
It is particularly important to future SPIR-V changes where there is less aggregate
type uniqueness due to carrying different layout information with the type.
This commit is contained in:
John Kessenich 2015-09-13 14:46:30 -06:00
parent c9a808319a
commit fa668dad99
8 changed files with 144 additions and 137 deletions
Download patch file Download diff file Expand all files Collapse all files

18
SPIRV/SpvBuilder.h
View file

@ -431,7 +431,7 @@ public:
Id instr; // the instruction that generates this access chain
std::vector<unsigned> swizzle;
Id component; // a dynamic component index, can coexist with a swizzle, done after the swizzle
Id resultType; // dereferenced type, to be exclusive of swizzles
Id preSwizzleBaseType; // dereferenced type, before swizzle or component is applied; NoType unless a swizzle or component is present
bool isRValue;
};
@ -452,7 +452,6 @@ public:
{
assert(isPointer(lValue));
accessChain.base = lValue;
accessChain.resultType = getContainedTypeId(getTypeId(lValue));
}
// set new base value as an r-value
@ -460,27 +459,30 @@ public:
{
accessChain.isRValue = true;
accessChain.base = rValue;
accessChain.resultType = getTypeId(rValue);
}
// push offset onto the end of the chain
void accessChainPush(Id offset, Id newType)
void accessChainPush(Id offset)
{
accessChain.indexChain.push_back(offset);
accessChain.resultType = newType;
}
// push new swizzle onto the end of any existing swizzle, merging into a single swizzle
void accessChainPushSwizzle(std::vector<unsigned>& swizzle);
void accessChainPushSwizzle(std::vector<unsigned>& swizzle, Id preSwizzleBaseType);
// push a variable component selection onto the access chain; supporting only one, so unsided
void accessChainPushComponent(Id component) { accessChain.component = component; }
void accessChainPushComponent(Id component, Id preSwizzleBaseType)
{
accessChain.component = component;
if (accessChain.preSwizzleBaseType == NoType)
accessChain.preSwizzleBaseType = preSwizzleBaseType;
}
// use accessChain and swizzle to store value
void accessChainStore(Id rvalue);
// use accessChain and swizzle to load an r-value
Id accessChainLoad(Decoration precision);
Id accessChainLoad(Id ResultType);
// get the direct pointer for an l-value
Id accessChainGetLValue();