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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 "ui/gl/gl_gl_api_implementation.h"
#include <algorithm>
#include <vector>
#include "base/command_line.h"
#include "base/string_util.h"
#include "ui/gl/gl_context.h"
#include "ui/gl/gl_state_restorer.h"
#include "ui/gl/gl_surface.h"
#include "ui/gl/gl_switches.h"
namespace gfx {
// The GL Api being used. This could be g_real_gl or gl_trace_gl
static GLApi* g_gl;
// A GL Api that calls directly into the driver.
static RealGLApi* g_real_gl;
// A GL Api that calls TRACE and then calls another GL api.
static TraceGLApi* g_trace_gl;
void InitializeGLBindingsGL() {
g_driver_gl.InitializeBindings();
if (!g_real_gl) {
g_real_gl = new RealGLApi();
g_trace_gl = new TraceGLApi(g_real_gl);
}
g_real_gl->Initialize(&g_driver_gl);
g_gl = g_real_gl;
if (CommandLine::ForCurrentProcess()->HasSwitch(
switches::kEnableGPUServiceTracing)) {
g_gl = g_trace_gl;
}
SetGLToRealGLApi();
}
GLApi* GetCurrentGLApi() {
return g_current_gl_context;
}
void SetGLApi(GLApi* api) {
g_current_gl_context = api;
}
void SetGLToRealGLApi() {
SetGLApi(g_gl);
}
void InitializeGLExtensionBindingsGL(GLContext* context) {
g_driver_gl.InitializeExtensionBindings(context);
}
void InitializeDebugGLBindingsGL() {
g_driver_gl.InitializeDebugBindings();
}
void ClearGLBindingsGL() {
if (g_real_gl) {
delete g_real_gl;
g_real_gl = NULL;
}
if (g_trace_gl) {
delete g_trace_gl;
g_trace_gl = NULL;
}
g_gl = NULL;
g_current_gl_context = NULL;
g_driver_gl.ClearBindings();
}
GLApi::GLApi() {
}
GLApi::~GLApi() {
}
GLApiBase::GLApiBase()
: driver_(NULL) {
}
GLApiBase::~GLApiBase() {
}
void GLApiBase::InitializeBase(DriverGL* driver) {
driver_ = driver;
}
RealGLApi::RealGLApi() {
}
RealGLApi::~RealGLApi() {
}
void RealGLApi::Initialize(DriverGL* driver) {
InitializeBase(driver);
}
TraceGLApi::~TraceGLApi() {
}
VirtualGLApi::VirtualGLApi()
: real_context_(NULL),
current_context_(NULL) {
}
VirtualGLApi::~VirtualGLApi() {
}
void VirtualGLApi::Initialize(DriverGL* driver, GLContext* real_context) {
InitializeBase(driver);
real_context_ = real_context;
DCHECK(real_context->IsCurrent(NULL));
std::string ext_string(
reinterpret_cast<const char*>(driver_->fn.glGetStringFn(GL_EXTENSIONS)));
std::vector<std::string> ext;
Tokenize(ext_string, " ", &ext);
std::vector<std::string>::iterator it;
// We can't support GL_EXT_occlusion_query_boolean which is
// based on GL_ARB_occlusion_query without a lot of work virtualizing
// queries.
it = std::find(ext.begin(), ext.end(), "GL_EXT_occlusion_query_boolean");
if (it != ext.end())
ext.erase(it);
extensions_ = JoinString(ext, " ");
}
bool VirtualGLApi::MakeCurrent(GLContext* virtual_context, GLSurface* surface) {
bool switched_contexts = g_current_gl_context != this;
GLSurface* current_surface = GLSurface::GetCurrent();
if (switched_contexts || surface != current_surface) {
if (!switched_contexts && current_surface &&
virtual_context->IsCurrent(surface)) {
// MakeCurrent 'lite' path that avoids potentially expensive MakeCurrent()
// calls if the GLSurface uses the same underlying surface or renders to
// an FBO.
if (!surface->OnMakeCurrent(real_context_)) {
LOG(ERROR) << "Could not make GLSurface current.";
return false;
}
} else if (!real_context_->MakeCurrent(surface)) {
return false;
}
}
DCHECK(GLSurface::GetCurrent());
DCHECK(real_context_->IsCurrent(GLSurface::GetCurrent()));
DCHECK(virtual_context->IsCurrent(surface));
if (switched_contexts || virtual_context != current_context_) {
// There should be no errors from the previous context leaking into the
// new context.
DCHECK_EQ(glGetErrorFn(), static_cast<GLenum>(GL_NO_ERROR));
current_context_ = virtual_context;
// Set all state that is different from the real state
// NOTE: !!! This is a temporary implementation that just restores all
// state to let us test that it works.
// TODO: ASAP, change this to something that only restores the state
// needed for individual GL calls.
GLApi* temp = GetCurrentGLApi();
SetGLToRealGLApi();
virtual_context->GetGLStateRestorer()->RestoreState();
SetGLApi(temp);
}
SetGLApi(this);
return true;
}
void VirtualGLApi::OnDestroyVirtualContext(GLContext* virtual_context) {
if (current_context_ == virtual_context)
current_context_ = NULL;
}
const GLubyte* VirtualGLApi::glGetStringFn(GLenum name) {
switch (name) {
case GL_EXTENSIONS:
return reinterpret_cast<const GLubyte*>(extensions_.c_str());
default:
return driver_->fn.glGetStringFn(name);
}
}
} // namespace gfx
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