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/*
* Copyright 2016 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "GrVkVaryingHandler.h"
/** Returns the number of locations take up by a given GrSLType. We assume that all
scalar values are 32 bits. */
static inline int grsltype_to_location_size(GrSLType type) {
switch(type) {
case kVoid_GrSLType:
return 0;
case kFloat_GrSLType:
return 1;
case kVec2f_GrSLType:
return 1;
case kVec3f_GrSLType:
return 1;
case kVec4f_GrSLType:
return 1;
case kMat22f_GrSLType:
return 2;
case kMat33f_GrSLType:
return 3;
case kMat44f_GrSLType:
return 4;
case kTexture2DSampler_GrSLType:
return 0;
case kITexture2DSampler_GrSLType:
return 0;
case kTextureExternalSampler_GrSLType:
return 0;
case kTexture2DRectSampler_GrSLType:
return 0;
case kBufferSampler_GrSLType:
return 0;
case kBool_GrSLType:
return 1;
case kInt_GrSLType:
return 1;
case kUint_GrSLType:
return 1;
case kTexture2D_GrSLType:
return 0;
case kSampler_GrSLType:
return 0;
case kImageStorage2D_GrSLType:
return 0;
case kIImageStorage2D_GrSLType:
return 0;
}
SkFAIL("Unexpected type");
return -1;
}
void finalize_helper(GrVkVaryingHandler::VarArray& vars) {
int locationIndex = 0;
for (int i = 0; i < vars.count(); ++i) {
GrShaderVar& var = vars[i];
SkString location;
location.appendf("location = %d", locationIndex);
var.addLayoutQualifier(location.c_str());
int elementSize = grsltype_to_location_size(var.getType());
SkASSERT(elementSize);
int numElements = 1;
if (var.isArray()) {
numElements = var.getArrayCount();
}
locationIndex += elementSize * numElements;
}
// Vulkan requires at least 64 locations to be supported for both vertex output and fragment
// input. If we ever hit this assert, then we'll need to add a cap to actually check the
// supported input and output values and adjust our supported shaders based on those values.
SkASSERT(locationIndex <= 64);
}
void GrVkVaryingHandler::onFinalize() {
finalize_helper(fVertexInputs);
finalize_helper(fVertexOutputs);
finalize_helper(fGeomInputs);
finalize_helper(fGeomOutputs);
finalize_helper(fFragInputs);
finalize_helper(fFragOutputs);
}
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