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Front-end: Fix issue #443: dvec3 uses only 2 components of second location.

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This commit is contained in:
John Kessenich 2016-08-08 15:31:36 -06:00
parent 34177cd778
commit 426542ba57
4 changed files with 83 additions and 27 deletions
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104
glslang/MachineIndependent/linkValidate.cpp
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@ -664,37 +664,93 @@ int TIntermediate::addUsedLocation(const TQualifier& qualifier, const TType& typ
size = computeTypeLocationSize(type);
}
// locations...
TRange locationRange(qualifier.layoutLocation, qualifier.layoutLocation + size - 1);
// Locations, and components within locations.
//
// Almost always, dealing with components means a single location is involved.
// The exception is a dvec3. From the spec:
//
// "A dvec3 will consume all four components of the first location and components 0 and 1 of
// the second location. This leaves components 2 and 3 available for other component-qualified
// declarations."
//
// That means, without ever mentioning a component, a component range
// for a different location gets specified, if it's not a vertex shader input. (!)
// (A vertex shader input will show using only one location, even for a dvec3/4.)
//
// So, for the case of dvec3, we need two independent ioRanges.
// components in this location slot...
TRange componentRange(0, 3);
if (qualifier.hasComponent() || type.getVectorSize() > 0) {
int consumedComponents = type.getVectorSize() * (type.getBasicType() == EbtDouble ? 2 : 1);
if (qualifier.hasComponent())
componentRange.start = qualifier.layoutComponent;
componentRange.last = componentRange.start + consumedComponents - 1;
int collision = -1; // no collision
if (size == 2 && type.getBasicType() == EbtDouble && type.getVectorSize() == 3 &&
(qualifier.isPipeInput() || qualifier.isPipeOutput())) {
// Dealing with dvec3 in/out split across two locations.
// Need two io-ranges.
// The case where the dvec3 doesn't start at component 0 was previously caught as overflow.
// First range:
TRange locationRange(qualifier.layoutLocation, qualifier.layoutLocation);
TRange componentRange(0, 3);
TIoRange range(locationRange, componentRange, type.getBasicType(), 0);
// check for collisions
collision = checkLocationRange(set, range, type, typeCollision);
if (collision < 0) {
usedIo[set].push_back(range);
// Second range:
TRange locationRange2(qualifier.layoutLocation + 1, qualifier.layoutLocation + 1);
TRange componentRange2(0, 1);
TIoRange range2(locationRange2, componentRange2, type.getBasicType(), 0);
// check for collisions
collision = checkLocationRange(set, range2, type, typeCollision);
if (collision < 0)
usedIo[set].push_back(range2);
}
} else {
// Not a dvec3 in/out split across two locations, generic path.
// Need a single IO-range block.
TRange locationRange(qualifier.layoutLocation, qualifier.layoutLocation + size - 1);
TRange componentRange(0, 3);
if (qualifier.hasComponent() || type.getVectorSize() > 0) {
int consumedComponents = type.getVectorSize() * (type.getBasicType() == EbtDouble ? 2 : 1);
if (qualifier.hasComponent())
componentRange.start = qualifier.layoutComponent;
componentRange.last = componentRange.start + consumedComponents - 1;
}
// combine location and component ranges
TIoRange range(locationRange, componentRange, type.getBasicType(), qualifier.hasIndex() ? qualifier.layoutIndex : 0);
// check for collisions, except for vertex inputs on desktop
if (! (profile != EEsProfile && language == EShLangVertex && qualifier.isPipeInput()))
collision = checkLocationRange(set, range, type, typeCollision);
if (collision < 0)
usedIo[set].push_back(range);
}
// both...
TIoRange range(locationRange, componentRange, type.getBasicType(), qualifier.hasIndex() ? qualifier.layoutIndex : 0);
return collision;
}
// check for collisions, except for vertex inputs on desktop
if (! (profile != EEsProfile && language == EShLangVertex && qualifier.isPipeInput())) {
for (size_t r = 0; r < usedIo[set].size(); ++r) {
if (range.overlap(usedIo[set][r])) {
// there is a collision; pick one
return std::max(locationRange.start, usedIo[set][r].location.start);
} else if (locationRange.overlap(usedIo[set][r].location) && type.getBasicType() != usedIo[set][r].basicType) {
// aliased-type mismatch
typeCollision = true;
return std::max(locationRange.start, usedIo[set][r].location.start);
}
// Compare a new (the passed in) 'range' against the existing set, and see
// if there are any collisions.
//
// Returns < 0 if no collision, >= 0 if collision and the value returned is a colliding value.
//
int TIntermediate::checkLocationRange(int set, const TIoRange& range, const TType& type, bool& typeCollision)
{
for (size_t r = 0; r < usedIo[set].size(); ++r) {
if (range.overlap(usedIo[set][r])) {
// there is a collision; pick one
return std::max(range.location.start, usedIo[set][r].location.start);
} else if (range.location.overlap(usedIo[set][r].location) && type.getBasicType() != usedIo[set][r].basicType) {
// aliased-type mismatch
typeCollision = true;
return std::max(range.location.start, usedIo[set][r].location.start);
}
}
usedIo[set].push_back(range);
return -1; // no collision
}