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/*
* Copyright 2013 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "GrGLVertexArray.h"
#include "GrGLBuffer.h"
#include "GrGLGpu.h"
struct AttribLayout {
bool fNormalized; // Only used by floating point types.
uint8_t fCount;
uint16_t fType;
};
GR_STATIC_ASSERT(4 == sizeof(AttribLayout));
static AttribLayout attrib_layout(GrVertexAttribType type) {
switch (type) {
case kFloat_GrVertexAttribType:
return {false, 1, GR_GL_FLOAT};
case kVec2f_GrVertexAttribType:
return {false, 2, GR_GL_FLOAT};
case kVec3f_GrVertexAttribType:
return {false, 3, GR_GL_FLOAT};
case kVec4f_GrVertexAttribType:
return {false, 4, GR_GL_FLOAT};
case kVec2i_GrVertexAttribType:
return {false, 2, GR_GL_INT};
case kVec3i_GrVertexAttribType:
return {false, 3, GR_GL_INT};
case kVec4i_GrVertexAttribType:
return {false, 4, GR_GL_INT};
case kUByte_GrVertexAttribType:
return {true, 1, GR_GL_UNSIGNED_BYTE};
case kVec4ub_GrVertexAttribType:
return {true, 4, GR_GL_UNSIGNED_BYTE};
case kVec2us_norm_GrVertexAttribType:
return {true, 2, GR_GL_UNSIGNED_SHORT};
case kVec2us_uint_GrVertexAttribType:
return {false, 2, GR_GL_UNSIGNED_SHORT};
case kInt_GrVertexAttribType:
return {false, 1, GR_GL_INT};
case kUint_GrVertexAttribType:
return {false, 1, GR_GL_UNSIGNED_INT};
}
SK_ABORT("Unknown vertex attrib type");
return {false, 0, 0};
};
static bool GrVertexAttribTypeIsIntType(const GrShaderCaps* shaderCaps,
GrVertexAttribType type) {
switch (type) {
case kFloat_GrVertexAttribType:
return false;
case kVec2f_GrVertexAttribType:
return false;
case kVec3f_GrVertexAttribType:
return false;
case kVec4f_GrVertexAttribType:
return false;
case kVec2i_GrVertexAttribType:
return true;
case kVec3i_GrVertexAttribType:
return true;
case kVec4i_GrVertexAttribType:
return true;
case kUByte_GrVertexAttribType:
return false;
case kVec4ub_GrVertexAttribType:
return false;
case kVec2us_norm_GrVertexAttribType:
return false;
case kVec2us_uint_GrVertexAttribType:
return shaderCaps->integerSupport();
case kInt_GrVertexAttribType:
return true;
case kUint_GrVertexAttribType:
return true;
}
SK_ABORT("Unexpected attribute type");
return false;
}
void GrGLAttribArrayState::set(GrGLGpu* gpu,
int index,
const GrBuffer* vertexBuffer,
GrVertexAttribType type,
GrGLsizei stride,
size_t offsetInBytes,
int divisor) {
SkASSERT(index >= 0 && index < fAttribArrayStates.count());
SkASSERT(0 == divisor || gpu->caps()->instanceAttribSupport());
AttribArrayState* array = &fAttribArrayStates[index];
if (array->fVertexBufferUniqueID != vertexBuffer->uniqueID() ||
array->fType != type ||
array->fStride != stride ||
array->fOffset != offsetInBytes) {
gpu->bindBuffer(kVertex_GrBufferType, vertexBuffer);
const AttribLayout& layout = attrib_layout(type);
const GrGLvoid* offsetAsPtr = reinterpret_cast<const GrGLvoid*>(offsetInBytes);
if (!GrVertexAttribTypeIsIntType(gpu->caps()->shaderCaps(), type)) {
GR_GL_CALL(gpu->glInterface(), VertexAttribPointer(index,
layout.fCount,
layout.fType,
layout.fNormalized,
stride,
offsetAsPtr));
} else {
SkASSERT(gpu->caps()->shaderCaps()->integerSupport());
SkASSERT(!layout.fNormalized);
GR_GL_CALL(gpu->glInterface(), VertexAttribIPointer(index,
layout.fCount,
layout.fType,
stride,
offsetAsPtr));
}
array->fVertexBufferUniqueID = vertexBuffer->uniqueID();
array->fType = type;
array->fStride = stride;
array->fOffset = offsetInBytes;
}
if (gpu->caps()->instanceAttribSupport() && array->fDivisor != divisor) {
SkASSERT(0 == divisor || 1 == divisor); // not necessarily a requirement but what we expect.
GR_GL_CALL(gpu->glInterface(), VertexAttribDivisor(index, divisor));
array->fDivisor = divisor;
}
}
void GrGLAttribArrayState::enableVertexArrays(const GrGLGpu* gpu, int enabledCount) {
SkASSERT(enabledCount <= fAttribArrayStates.count());
if (fEnabledCountIsValid && enabledCount == fNumEnabledArrays) {
return;
}
int firstIdxToEnable = fEnabledCountIsValid ? fNumEnabledArrays : 0;
for (int i = firstIdxToEnable; i < enabledCount; ++i) {
GR_GL_CALL(gpu->glInterface(), EnableVertexAttribArray(i));
}
int endIdxToDisable = fEnabledCountIsValid ? fNumEnabledArrays : fAttribArrayStates.count();
for (int i = enabledCount; i < endIdxToDisable; ++i) {
GR_GL_CALL(gpu->glInterface(), DisableVertexAttribArray(i));
}
fNumEnabledArrays = enabledCount;
fEnabledCountIsValid = true;
}
///////////////////////////////////////////////////////////////////////////////////////////////////
GrGLVertexArray::GrGLVertexArray(GrGLint id, int attribCount)
: fID(id)
, fAttribArrays(attribCount)
, fIndexBufferUniqueID(SK_InvalidUniqueID) {
}
GrGLAttribArrayState* GrGLVertexArray::bind(GrGLGpu* gpu) {
if (0 == fID) {
return nullptr;
}
gpu->bindVertexArray(fID);
return &fAttribArrays;
}
GrGLAttribArrayState* GrGLVertexArray::bindWithIndexBuffer(GrGLGpu* gpu, const GrBuffer* ibuff) {
GrGLAttribArrayState* state = this->bind(gpu);
if (state && fIndexBufferUniqueID != ibuff->uniqueID()) {
if (ibuff->isCPUBacked()) {
GR_GL_CALL(gpu->glInterface(), BindBuffer(GR_GL_ELEMENT_ARRAY_BUFFER, 0));
} else {
const GrGLBuffer* glBuffer = static_cast<const GrGLBuffer*>(ibuff);
GR_GL_CALL(gpu->glInterface(), BindBuffer(GR_GL_ELEMENT_ARRAY_BUFFER,
glBuffer->bufferID()));
}
fIndexBufferUniqueID = ibuff->uniqueID();
}
return state;
}
void GrGLVertexArray::invalidateCachedState() {
fAttribArrays.invalidate();
fIndexBufferUniqueID.makeInvalid();
}
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