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gl_context_egl.cc
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gl_context_egl.cc
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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_context_egl.h"
#include <memory>
#include "base/command_line.h"
#include "base/logging.h"
#include "base/trace_event/trace_event.h"
#include "build/build_config.h"
#include "third_party/khronos/EGL/egl.h"
#include "third_party/khronos/EGL/eglext.h"
#include "ui/gl/egl_util.h"
#include "ui/gl/gl_bindings.h"
#include "ui/gl/gl_surface_egl.h"
#if defined(USE_X11)
extern "C" {
#include <X11/Xlib.h>
}
#endif
#ifndef EGL_CHROMIUM_create_context_bind_generates_resource
#define EGL_CHROMIUM_create_context_bind_generates_resource 1
#define EGL_CONTEXT_BIND_GENERATES_RESOURCE_CHROMIUM 0x3AAD
#endif /* EGL_CHROMIUM_create_context_bind_generates_resource */
#ifndef EGL_ANGLE_create_context_webgl_compatibility
#define EGL_ANGLE_create_context_webgl_compatibility 1
#define EGL_CONTEXT_WEBGL_COMPATIBILITY_ANGLE 0x3AAC
#endif /* EGL_ANGLE_create_context_webgl_compatibility */
#ifndef EGL_ANGLE_display_texture_share_group
#define EGL_ANGLE_display_texture_share_group 1
#define EGL_DISPLAY_TEXTURE_SHARE_GROUP_ANGLE 0x3AAF
#endif /* EGL_ANGLE_display_texture_share_group */
#ifndef EGL_ANGLE_create_context_client_arrays
#define EGL_ANGLE_create_context_client_arrays 1
#define EGL_CONTEXT_CLIENT_ARRAYS_ENABLED_ANGLE 0x3452
#endif /* EGL_ANGLE_create_context_client_arrays */
using ui::GetLastEGLErrorString;
namespace gl {
GLContextEGL::GLContextEGL(GLShareGroup* share_group)
: GLContextReal(share_group),
context_(nullptr),
display_(nullptr),
config_(nullptr),
unbind_fbo_on_makecurrent_(false) {}
bool GLContextEGL::Initialize(GLSurface* compatible_surface,
const GLContextAttribs& attribs) {
DCHECK(compatible_surface);
DCHECK(!context_);
display_ = compatible_surface->GetDisplay();
config_ = compatible_surface->GetConfig();
EGLint config_renderable_type = 0;
if (!eglGetConfigAttrib(display_, config_, EGL_RENDERABLE_TYPE,
&config_renderable_type)) {
LOG(ERROR) << "eglGetConfigAttrib failed with error "
<< GetLastEGLErrorString();
return false;
}
EGLint context_client_major_version = attribs.client_major_es_version;
EGLint context_client_minor_version = attribs.client_minor_es_version;
// If the requested context is ES3 but the config cannot support ES3, request
// ES2 instead.
if ((config_renderable_type & EGL_OPENGL_ES3_BIT) == 0 &&
context_client_major_version >= 3) {
context_client_major_version = 2;
context_client_minor_version = 0;
}
std::vector<EGLint> context_attributes;
// EGL_KHR_create_context allows requesting both a major and minor context
// version
if (GLSurfaceEGL::HasEGLExtension("EGL_KHR_create_context")) {
context_attributes.push_back(EGL_CONTEXT_MAJOR_VERSION);
context_attributes.push_back(context_client_major_version);
context_attributes.push_back(EGL_CONTEXT_MINOR_VERSION);
context_attributes.push_back(context_client_minor_version);
} else {
context_attributes.push_back(EGL_CONTEXT_CLIENT_VERSION);
context_attributes.push_back(context_client_major_version);
// Can only request 2.0 or 3.0 contexts without the EGL_KHR_create_context
// extension, DCHECK to make sure we update the code to support devices
// without this extension
DCHECK(context_client_minor_version == 0);
}
if (GLSurfaceEGL::IsCreateContextRobustnessSupported()) {
DVLOG(1) << "EGL_EXT_create_context_robustness supported.";
context_attributes.push_back(
EGL_CONTEXT_OPENGL_RESET_NOTIFICATION_STRATEGY_EXT);
context_attributes.push_back(EGL_LOSE_CONTEXT_ON_RESET_EXT);
} else {
// At some point we should require the presence of the robustness
// extension and remove this code path.
DVLOG(1) << "EGL_EXT_create_context_robustness NOT supported.";
}
if (!eglBindAPI(EGL_OPENGL_ES_API)) {
LOG(ERROR) << "eglBindApi failed with error "
<< GetLastEGLErrorString();
return false;
}
if (GLSurfaceEGL::IsCreateContextBindGeneratesResourceSupported()) {
context_attributes.push_back(EGL_CONTEXT_BIND_GENERATES_RESOURCE_CHROMIUM);
context_attributes.push_back(attribs.bind_generates_resource ? EGL_TRUE
: EGL_FALSE);
} else {
DCHECK(attribs.bind_generates_resource);
}
if (GLSurfaceEGL::IsCreateContextWebGLCompatabilitySupported()) {
context_attributes.push_back(EGL_CONTEXT_WEBGL_COMPATIBILITY_ANGLE);
context_attributes.push_back(
attribs.webgl_compatibility_context ? EGL_TRUE : EGL_FALSE);
} else {
DCHECK(!attribs.webgl_compatibility_context);
}
if (GLSurfaceEGL::HasEGLExtension("EGL_ANGLE_display_texture_share_group")) {
context_attributes.push_back(EGL_DISPLAY_TEXTURE_SHARE_GROUP_ANGLE);
context_attributes.push_back(
attribs.global_texture_share_group ? EGL_TRUE : EGL_FALSE);
} else {
DCHECK(!attribs.global_texture_share_group);
}
if (GLSurfaceEGL::HasEGLExtension("EGL_ANGLE_create_context_client_arrays")) {
// Disable client arrays if the context supports it
context_attributes.push_back(EGL_CONTEXT_CLIENT_ARRAYS_ENABLED_ANGLE);
context_attributes.push_back(EGL_FALSE);
}
// Append final EGL_NONE to signal the context attributes are finished
context_attributes.push_back(EGL_NONE);
context_attributes.push_back(EGL_NONE);
context_ = eglCreateContext(
display_, config_, share_group() ? share_group()->GetHandle() : nullptr,
context_attributes.data());
if (!context_) {
LOG(ERROR) << "eglCreateContext failed with error "
<< GetLastEGLErrorString();
return false;
}
return true;
}
void GLContextEGL::Destroy() {
if (context_) {
if (!eglDestroyContext(display_, context_)) {
LOG(ERROR) << "eglDestroyContext failed with error "
<< GetLastEGLErrorString();
}
context_ = nullptr;
}
}
bool GLContextEGL::MakeCurrent(GLSurface* surface) {
DCHECK(context_);
if (IsCurrent(surface))
return true;
ScopedReleaseCurrent release_current;
TRACE_EVENT2("gpu", "GLContextEGL::MakeCurrent",
"context", context_,
"surface", surface);
if (unbind_fbo_on_makecurrent_ && GetCurrent()) {
glBindFramebufferEXT(GL_FRAMEBUFFER, 0);
}
if (!eglMakeCurrent(display_,
surface->GetHandle(),
surface->GetHandle(),
context_)) {
DVLOG(1) << "eglMakeCurrent failed with error "
<< GetLastEGLErrorString();
return false;
}
// Set this as soon as the context is current, since we might call into GL.
BindGLApi();
SetCurrent(surface);
InitializeDynamicBindings();
if (!surface->OnMakeCurrent(this)) {
LOG(ERROR) << "Could not make current.";
return false;
}
release_current.Cancel();
return true;
}
void GLContextEGL::SetUnbindFboOnMakeCurrent() {
unbind_fbo_on_makecurrent_ = true;
}
void GLContextEGL::ReleaseCurrent(GLSurface* surface) {
if (!IsCurrent(surface))
return;
if (unbind_fbo_on_makecurrent_)
glBindFramebufferEXT(GL_FRAMEBUFFER, 0);
SetCurrent(nullptr);
eglMakeCurrent(display_,
EGL_NO_SURFACE,
EGL_NO_SURFACE,
EGL_NO_CONTEXT);
}
bool GLContextEGL::IsCurrent(GLSurface* surface) {
DCHECK(context_);
bool native_context_is_current = context_ == eglGetCurrentContext();
// If our context is current then our notion of which GLContext is
// current must be correct. On the other hand, third-party code
// using OpenGL might change the current context.
DCHECK(!native_context_is_current || (GetRealCurrent() == this));
if (!native_context_is_current)
return false;
if (surface) {
if (surface->GetHandle() != eglGetCurrentSurface(EGL_DRAW))
return false;
}
return true;
}
void* GLContextEGL::GetHandle() {
return context_;
}
void GLContextEGL::OnSetSwapInterval(int interval) {
DCHECK(IsCurrent(nullptr) && GLSurface::GetCurrent());
// This is a surfaceless context. eglSwapInterval doesn't take any effect in
// this case and will just return EGL_BAD_SURFACE.
if (GLSurface::GetCurrent()->IsSurfaceless())
return;
if (!eglSwapInterval(display_, interval)) {
LOG(ERROR) << "eglSwapInterval failed with error "
<< GetLastEGLErrorString();
}
}
std::string GLContextEGL::GetExtensions() {
const char* extensions = eglQueryString(display_,
EGL_EXTENSIONS);
if (!extensions)
return GLContext::GetExtensions();
return GLContext::GetExtensions() + " " + extensions;
}
bool GLContextEGL::WasAllocatedUsingRobustnessExtension() {
return GLSurfaceEGL::IsCreateContextRobustnessSupported();
}
GLContextEGL::~GLContextEGL() {
Destroy();
}
} // namespace gl