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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "gpu/command_buffer/service/vertex_attrib_manager.h"
#include <list>
#include "base/logging.h"
#include "base/memory/scoped_ptr.h"
#include "build/build_config.h"
#define GLES2_GPU_SERVICE 1
#include "gpu/command_buffer/common/gles2_cmd_format.h"
#include "gpu/command_buffer/common/gles2_cmd_utils.h"
#include "gpu/command_buffer/service/gl_utils.h"
namespace gpu {
namespace gles2 {
VertexAttribManager::VertexAttribInfo::VertexAttribInfo()
: index_(0),
enabled_(false),
size_(4),
type_(GL_FLOAT),
offset_(0),
normalized_(GL_FALSE),
gl_stride_(0),
real_stride_(16),
divisor_(0),
list_(NULL) {
value_.v[0] = 0.0f;
value_.v[1] = 0.0f;
value_.v[2] = 0.0f;
value_.v[3] = 1.0f;
}
VertexAttribManager::VertexAttribInfo::~VertexAttribInfo() {
}
bool VertexAttribManager::VertexAttribInfo::CanAccess(GLuint index) const {
if (!enabled_) {
return true;
}
if (!buffer_ || buffer_->IsDeleted()) {
return false;
}
// The number of elements that can be accessed.
GLsizeiptr buffer_size = buffer_->size();
if (offset_ > buffer_size || real_stride_ == 0) {
return false;
}
uint32 usable_size = buffer_size - offset_;
GLuint num_elements = usable_size / real_stride_ +
((usable_size % real_stride_) >=
(GLES2Util::GetGLTypeSizeForTexturesAndBuffers(type_) * size_) ? 1 : 0);
return index < num_elements;
}
VertexAttribManager::VertexAttribManager()
: max_vertex_attribs_(0),
num_fixed_attribs_(0) {
}
VertexAttribManager::~VertexAttribManager() {
}
void VertexAttribManager::Initialize(uint32 max_vertex_attribs) {
max_vertex_attribs_ = max_vertex_attribs;
vertex_attrib_infos_.reset(
new VertexAttribInfo[max_vertex_attribs]);
for (uint32 vv = 0; vv < max_vertex_attribs; ++vv) {
vertex_attrib_infos_[vv].set_index(vv);
vertex_attrib_infos_[vv].SetList(&disabled_vertex_attribs_);
}
}
bool VertexAttribManager::Enable(GLuint index, bool enable) {
if (index >= max_vertex_attribs_) {
return false;
}
VertexAttribInfo& info = vertex_attrib_infos_[index];
if (info.enabled() != enable) {
info.set_enabled(enable);
info.SetList(enable ? &enabled_vertex_attribs_ : &disabled_vertex_attribs_);
}
return true;
}
void VertexAttribManager::Unbind(BufferManager::BufferInfo* buffer) {
for (uint32 vv = 0; vv < max_vertex_attribs_; ++vv) {
vertex_attrib_infos_[vv].Unbind(buffer);
}
}
} // namespace gles2
} // namespace gpu
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