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//
// Copyright (c) 2013 The ANGLE Project Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//
// Implementation of the state class for mananging GLES 3 Vertex Array Objects.
//
#include "libANGLE/VertexArray.h"
#include "libANGLE/Buffer.h"
#include "libANGLE/Context.h"
#include "libANGLE/renderer/GLImplFactory.h"
#include "libANGLE/renderer/VertexArrayImpl.h"
namespace gl
{
VertexArrayState::VertexArrayState(size_t maxAttribs, size_t maxAttribBindings)
: mLabel(), mVertexBindings(maxAttribBindings), mMaxEnabledAttribute(0)
{
ASSERT(maxAttribs <= maxAttribBindings);
for (size_t i = 0; i < maxAttribs; i++)
{
mVertexAttributes.emplace_back(static_cast<GLuint>(i));
}
}
VertexArrayState::~VertexArrayState()
{
}
VertexArray::VertexArray(rx::GLImplFactory *factory,
GLuint id,
size_t maxAttribs,
size_t maxAttribBindings)
: mId(id),
mState(maxAttribs, maxAttribBindings),
mVertexArray(factory->createVertexArray(mState))
{
}
void VertexArray::onDestroy(const Context *context)
{
for (auto &binding : mState.mVertexBindings)
{
binding.setBuffer(context, nullptr);
}
mState.mElementArrayBuffer.set(context, nullptr);
mVertexArray->destroy(context);
SafeDelete(mVertexArray);
delete this;
}
VertexArray::~VertexArray()
{
ASSERT(!mVertexArray);
}
GLuint VertexArray::id() const
{
return mId;
}
void VertexArray::setLabel(const std::string &label)
{
mState.mLabel = label;
}
const std::string &VertexArray::getLabel() const
{
return mState.mLabel;
}
void VertexArray::detachBuffer(const Context *context, GLuint bufferName)
{
for (auto &binding : mState.mVertexBindings)
{
if (binding.getBuffer().id() == bufferName)
{
binding.setBuffer(context, nullptr);
}
}
if (mState.mElementArrayBuffer.id() == bufferName)
{
mState.mElementArrayBuffer.set(context, nullptr);
}
}
const VertexAttribute &VertexArray::getVertexAttribute(size_t attribIndex) const
{
ASSERT(attribIndex < getMaxAttribs());
return mState.mVertexAttributes[attribIndex];
}
const VertexBinding &VertexArray::getVertexBinding(size_t bindingIndex) const
{
ASSERT(bindingIndex < getMaxBindings());
return mState.mVertexBindings[bindingIndex];
}
size_t VertexArray::GetVertexIndexFromDirtyBit(size_t dirtyBit)
{
static_assert(gl::MAX_VERTEX_ATTRIBS == gl::MAX_VERTEX_ATTRIB_BINDINGS,
"The stride of vertex attributes should equal to that of vertex bindings.");
ASSERT(dirtyBit > DIRTY_BIT_ELEMENT_ARRAY_BUFFER);
return (dirtyBit - DIRTY_BIT_ATTRIB_0_ENABLED) % gl::MAX_VERTEX_ATTRIBS;
}
void VertexArray::bindVertexBufferImpl(const Context *context,
size_t bindingIndex,
Buffer *boundBuffer,
GLintptr offset,
GLsizei stride)
{
ASSERT(bindingIndex < getMaxBindings());
VertexBinding *binding = &mState.mVertexBindings[bindingIndex];
binding->setBuffer(context, boundBuffer);
binding->setOffset(offset);
binding->setStride(stride);
}
void VertexArray::bindVertexBuffer(const Context *context,
size_t bindingIndex,
Buffer *boundBuffer,
GLintptr offset,
GLsizei stride)
{
bindVertexBufferImpl(context, bindingIndex, boundBuffer, offset, stride);
mDirtyBits.set(DIRTY_BIT_BINDING_0_BUFFER + bindingIndex);
}
void VertexArray::setVertexAttribBinding(const Context *context,
size_t attribIndex,
GLuint bindingIndex)
{
ASSERT(attribIndex < getMaxAttribs() && bindingIndex < getMaxBindings());
if (mState.mVertexAttributes[attribIndex].bindingIndex != bindingIndex)
{
// In ES 3.0 contexts, the binding cannot change, hence the code below is unreachable.
ASSERT(context->getClientVersion() >= ES_3_1);
mState.mVertexAttributes[attribIndex].bindingIndex = bindingIndex;
mDirtyBits.set(DIRTY_BIT_ATTRIB_0_BINDING + attribIndex);
}
}
void VertexArray::setVertexBindingDivisor(size_t bindingIndex, GLuint divisor)
{
ASSERT(bindingIndex < getMaxBindings());
mState.mVertexBindings[bindingIndex].setDivisor(divisor);
mDirtyBits.set(DIRTY_BIT_BINDING_0_DIVISOR + bindingIndex);
}
void VertexArray::setVertexAttribFormatImpl(size_t attribIndex,
GLint size,
GLenum type,
bool normalized,
bool pureInteger,
GLuint relativeOffset)
{
ASSERT(attribIndex < getMaxAttribs());
VertexAttribute *attrib = &mState.mVertexAttributes[attribIndex];
attrib->size = size;
attrib->type = type;
attrib->normalized = normalized;
attrib->pureInteger = pureInteger;
attrib->relativeOffset = relativeOffset;
}
void VertexArray::setVertexAttribFormat(size_t attribIndex,
GLint size,
GLenum type,
bool normalized,
bool pureInteger,
GLuint relativeOffset)
{
setVertexAttribFormatImpl(attribIndex, size, type, normalized, pureInteger, relativeOffset);
mDirtyBits.set(DIRTY_BIT_ATTRIB_0_FORMAT + attribIndex);
}
void VertexArray::setVertexAttribDivisor(const Context *context, size_t attribIndex, GLuint divisor)
{
ASSERT(attribIndex < getMaxAttribs());
setVertexAttribBinding(context, attribIndex, static_cast<GLuint>(attribIndex));
setVertexBindingDivisor(attribIndex, divisor);
}
void VertexArray::enableAttribute(size_t attribIndex, bool enabledState)
{
ASSERT(attribIndex < getMaxAttribs());
mState.mVertexAttributes[attribIndex].enabled = enabledState;
mDirtyBits.set(DIRTY_BIT_ATTRIB_0_ENABLED + attribIndex);
// Update state cache
if (enabledState)
{
mState.mMaxEnabledAttribute = std::max(attribIndex + 1, mState.mMaxEnabledAttribute);
}
else if (mState.mMaxEnabledAttribute == attribIndex + 1)
{
while (mState.mMaxEnabledAttribute > 0 &&
!mState.mVertexAttributes[mState.mMaxEnabledAttribute - 1].enabled)
{
--mState.mMaxEnabledAttribute;
}
}
}
void VertexArray::setVertexAttribPointer(const Context *context,
size_t attribIndex,
gl::Buffer *boundBuffer,
GLint size,
GLenum type,
bool normalized,
bool pureInteger,
GLsizei stride,
const void *pointer)
{
ASSERT(attribIndex < getMaxAttribs());
GLintptr offset = boundBuffer ? reinterpret_cast<GLintptr>(pointer) : 0;
setVertexAttribFormatImpl(attribIndex, size, type, normalized, pureInteger, 0);
setVertexAttribBinding(context, attribIndex, static_cast<GLuint>(attribIndex));
VertexAttribute &attrib = mState.mVertexAttributes[attribIndex];
GLsizei effectiveStride =
stride != 0 ? stride : static_cast<GLsizei>(ComputeVertexAttributeTypeSize(attrib));
attrib.pointer = pointer;
attrib.vertexAttribArrayStride = stride;
bindVertexBufferImpl(context, attribIndex, boundBuffer, offset, effectiveStride);
mDirtyBits.set(DIRTY_BIT_ATTRIB_0_POINTER + attribIndex);
}
void VertexArray::setElementArrayBuffer(const Context *context, Buffer *buffer)
{
mState.mElementArrayBuffer.set(context, buffer);
mDirtyBits.set(DIRTY_BIT_ELEMENT_ARRAY_BUFFER);
}
void VertexArray::syncState(const Context *context)
{
if (mDirtyBits.any())
{
mVertexArray->syncState(context, mDirtyBits);
mDirtyBits.reset();
}
}
} // namespace gl
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