egl::Error DisplayD3D::createWindowSurface(const egl::Config *configuration, EGLNativeWindowType window,
const egl::AttributeMap &attribs, SurfaceImpl **outSurface)
{
ASSERT(mRenderer != nullptr);
EGLint width = attribs.get(EGL_WIDTH, 0);
EGLint height = attribs.get(EGL_HEIGHT, 0);
EGLint fixedSize = attribs.get(EGL_FIXED_SIZE_ANGLE, EGL_FALSE);
if (!fixedSize)
{
width = -1;
height = -1;
}
SurfaceD3D *surface = SurfaceD3D::createFromWindow(mRenderer, mDisplay, configuration, window, fixedSize,
width, height);
egl::Error error = surface->initialize();
if (error.isError())
{
SafeDelete(surface);
return error;
}
*outSurface = surface;
return egl::Error(EGL_SUCCESS);
}
EGLImageD3D::EGLImageD3D(RendererD3D *renderer,
EGLenum target,
egl::ImageSibling *buffer,
const egl::AttributeMap &attribs)
: mRenderer(renderer), mBuffer(buffer), mAttachmentBuffer(nullptr), mRenderTarget(nullptr)
{
ASSERT(renderer != nullptr);
ASSERT(buffer != nullptr);
if (egl::IsTextureTarget(target))
{
mAttachmentBuffer = GetImplAs<TextureD3D>(GetAs<gl::Texture>(buffer));
mAttachmentTarget = gl::FramebufferAttachment::Target(
GL_NONE, GetImageIndex(egl_gl::EGLImageTargetToGLTextureTarget(target),
attribs.get(EGL_GL_TEXTURE_LEVEL_KHR, 0),
attribs.get(EGL_GL_TEXTURE_ZOFFSET_KHR, 0)));
}
else if (egl::IsRenderbufferTarget(target))
{
mAttachmentBuffer = GetImplAs<RenderbufferD3D>(GetAs<gl::Renderbuffer>(buffer));
mAttachmentTarget =
gl::FramebufferAttachment::Target(GL_NONE, gl::ImageIndex::MakeInvalid());
}
else
{
UNREACHABLE();
}
}
egl::Error DisplayGL::createContext(const egl::Config *config, const gl::Context *shareContext, const egl::AttributeMap &attribs, gl::Context **outContext)
{
ASSERT(mRenderer != nullptr);
EGLint clientVersion = attribs.get(EGL_CONTEXT_CLIENT_VERSION, 1);
bool notifyResets = (attribs.get(EGL_CONTEXT_OPENGL_RESET_NOTIFICATION_STRATEGY_EXT, EGL_NO_RESET_NOTIFICATION_EXT) == EGL_LOSE_CONTEXT_ON_RESET_EXT);
bool robustAccess = (attribs.get(EGL_CONTEXT_OPENGL_ROBUST_ACCESS_EXT, EGL_FALSE) == EGL_TRUE);
*outContext = new gl::Context(config, clientVersion, shareContext, mRenderer, notifyResets, robustAccess);
return egl::Error(EGL_SUCCESS);
}
RendererGL::RendererGL(const FunctionsGL *functions, const egl::AttributeMap &attribMap)
: Renderer(),
mMaxSupportedESVersion(0, 0),
mFunctions(functions),
mStateManager(nullptr),
mBlitter(nullptr),
mSkipDrawCalls(false)
{
ASSERT(mFunctions);
mStateManager = new StateManagerGL(mFunctions, getRendererCaps());
nativegl_gl::GenerateWorkarounds(mFunctions, &mWorkarounds);
mBlitter = new BlitGL(functions, mWorkarounds, mStateManager);
#ifndef NDEBUG
if (mFunctions->debugMessageControl && mFunctions->debugMessageCallback)
{
mFunctions->enable(GL_DEBUG_OUTPUT_SYNCHRONOUS);
mFunctions->debugMessageControl(GL_DONT_CARE, GL_DONT_CARE, GL_DEBUG_SEVERITY_HIGH, 0, nullptr, GL_TRUE);
mFunctions->debugMessageControl(GL_DONT_CARE, GL_DONT_CARE, GL_DEBUG_SEVERITY_MEDIUM, 0, nullptr, GL_TRUE);
mFunctions->debugMessageControl(GL_DONT_CARE, GL_DONT_CARE, GL_DEBUG_SEVERITY_LOW, 0, nullptr, GL_FALSE);
mFunctions->debugMessageControl(GL_DONT_CARE, GL_DONT_CARE, GL_DEBUG_SEVERITY_NOTIFICATION, 0, nullptr, GL_FALSE);
mFunctions->debugMessageCallback(&LogGLDebugMessage, nullptr);
}
#endif
EGLint deviceType = attribMap.get(EGL_PLATFORM_ANGLE_DEVICE_TYPE_ANGLE, EGL_NONE);
if (deviceType == EGL_PLATFORM_ANGLE_DEVICE_TYPE_NULL_ANGLE)
{
mSkipDrawCalls = true;
}
}
SurfaceD3D::SurfaceD3D(const egl::SurfaceState &state,
RendererD3D *renderer,
egl::Display *display,
EGLNativeWindowType window,
EGLenum buftype,
EGLClientBuffer clientBuffer,
const egl::AttributeMap &attribs)
: SurfaceImpl(state),
mRenderer(renderer),
mDisplay(display),
mFixedSize(window == nullptr || attribs.get(EGL_FIXED_SIZE_ANGLE, EGL_FALSE) == EGL_TRUE),
mOrientation(static_cast<EGLint>(attribs.get(EGL_SURFACE_ORIENTATION_ANGLE, 0))),
mRenderTargetFormat(state.config->renderTargetFormat),
mDepthStencilFormat(state.config->depthStencilFormat),
mSwapChain(nullptr),
mSwapIntervalDirty(true),
mNativeWindow(renderer->createNativeWindow(window, state.config, attribs)),
mWidth(static_cast<EGLint>(attribs.get(EGL_WIDTH, 0))),
mHeight(static_cast<EGLint>(attribs.get(EGL_HEIGHT, 0))),
mSwapInterval(1),
mShareHandle(0),
mD3DTexture(nullptr)
{
if (window != nullptr && !mFixedSize)
{
mWidth = -1;
mHeight = -1;
}
switch (buftype)
{
case EGL_D3D_TEXTURE_2D_SHARE_HANDLE_ANGLE:
mShareHandle = static_cast<HANDLE>(clientBuffer);
break;
case EGL_D3D_TEXTURE_ANGLE:
mD3DTexture = static_cast<IUnknown *>(clientBuffer);
ASSERT(mD3DTexture != nullptr);
mD3DTexture->AddRef();
mRenderer->getD3DTextureInfo(state.config, mD3DTexture, &mWidth, &mHeight,
&mRenderTargetFormat);
break;
default:
break;
}
}
RendererGL::RendererGL(const FunctionsGL *functions, const egl::AttributeMap &attribMap)
: mMaxSupportedESVersion(0, 0),
mFunctions(functions),
mStateManager(nullptr),
mBlitter(nullptr),
mMultiviewClearer(nullptr),
mUseDebugOutput(false),
mSkipDrawCalls(false),
mCapsInitialized(false),
mMultiviewImplementationType(MultiviewImplementationTypeGL::UNSPECIFIED)
{
ASSERT(mFunctions);
nativegl_gl::GenerateWorkarounds(mFunctions, &mWorkarounds);
mStateManager = new StateManagerGL(mFunctions, getNativeCaps(), getNativeExtensions());
mBlitter = new BlitGL(functions, mWorkarounds, mStateManager);
mMultiviewClearer = new ClearMultiviewGL(functions, mStateManager);
bool hasDebugOutput = mFunctions->isAtLeastGL(gl::Version(4, 3)) ||
mFunctions->hasGLExtension("GL_KHR_debug") ||
mFunctions->isAtLeastGLES(gl::Version(3, 2)) ||
mFunctions->hasGLESExtension("GL_KHR_debug");
mUseDebugOutput = hasDebugOutput && ShouldUseDebugLayers(attribMap);
if (mUseDebugOutput)
{
mFunctions->enable(GL_DEBUG_OUTPUT);
mFunctions->enable(GL_DEBUG_OUTPUT_SYNCHRONOUS);
mFunctions->debugMessageControl(GL_DONT_CARE, GL_DONT_CARE, GL_DEBUG_SEVERITY_HIGH, 0,
nullptr, GL_TRUE);
mFunctions->debugMessageControl(GL_DONT_CARE, GL_DONT_CARE, GL_DEBUG_SEVERITY_MEDIUM, 0,
nullptr, GL_TRUE);
mFunctions->debugMessageControl(GL_DONT_CARE, GL_DONT_CARE, GL_DEBUG_SEVERITY_LOW, 0,
nullptr, GL_FALSE);
mFunctions->debugMessageControl(GL_DONT_CARE, GL_DONT_CARE, GL_DEBUG_SEVERITY_NOTIFICATION,
0, nullptr, GL_FALSE);
mFunctions->debugMessageCallback(&LogGLDebugMessage, nullptr);
}
EGLint deviceType =
static_cast<EGLint>(attribMap.get(EGL_PLATFORM_ANGLE_DEVICE_TYPE_ANGLE, EGL_NONE));
if (deviceType == EGL_PLATFORM_ANGLE_DEVICE_TYPE_NULL_ANGLE)
{
mSkipDrawCalls = true;
}
if (mWorkarounds.initializeCurrentVertexAttributes)
{
GLint maxVertexAttribs = 0;
mFunctions->getIntegerv(GL_MAX_VERTEX_ATTRIBS, &maxVertexAttribs);
for (GLint i = 0; i < maxVertexAttribs; ++i)
{
mFunctions->vertexAttrib4f(i, 0.0f, 0.0f, 0.0f, 1.0f);
}
}
}
egl::Error DisplayD3D::createPbufferSurface(const egl::Config *configuration, const egl::AttributeMap &attribs,
SurfaceImpl **outSurface)
{
ASSERT(mRenderer != nullptr);
EGLint width = attribs.get(EGL_WIDTH, 0);
EGLint height = attribs.get(EGL_HEIGHT, 0);
SurfaceD3D *surface = SurfaceD3D::createOffscreen(mRenderer, mDisplay, configuration, NULL, width, height);
egl::Error error = surface->initialize();
if (error.isError())
{
SafeDelete(surface);
return error;
}
*outSurface = surface;
return egl::Error(EGL_SUCCESS);
}
bool ShouldUseDebugLayers(const egl::AttributeMap &attribs)
{
EGLAttrib debugSetting =
attribs.get(EGL_PLATFORM_ANGLE_DEBUG_LAYERS_ENABLED_ANGLE, EGL_DONT_CARE);
// Prefer to enable debug layers if compiling in Debug, and disabled in Release.
#if defined(ANGLE_ENABLE_ASSERTS)
return (debugSetting != EGL_FALSE);
#else
return (debugSetting == EGL_TRUE);
#endif // defined(ANGLE_ENABLE_ASSERTS)
}
bool ShouldUseVirtualizedContexts(const egl::AttributeMap &attribs, bool defaultValue)
{
EGLAttrib virtualizedContextRequest =
attribs.get(EGL_PLATFORM_ANGLE_CONTEXT_VIRTUALIZATION_ANGLE, EGL_DONT_CARE);
if (defaultValue)
{
return (virtualizedContextRequest != EGL_FALSE);
}
else
{
return (virtualizedContextRequest == EGL_TRUE);
}
}
ImageEGL::ImageEGL(const egl::ImageState &state,
const gl::Context *context,
EGLenum target,
const egl::AttributeMap &attribs,
const FunctionsEGL *egl)
: ImageGL(state),
mEGL(egl),
mContext(EGL_NO_CONTEXT),
mTarget(target),
mPreserveImage(false),
mImage(EGL_NO_IMAGE)
{
if (context)
{
mContext = GetImplAs<ContextEGL>(context)->getContext();
}
mPreserveImage = attribs.get(EGL_IMAGE_PRESERVED, EGL_FALSE) == EGL_TRUE;
}
egl::Error DisplayGLX::initializeContext(glx::FBConfig config,
const egl::AttributeMap &eglAttributes,
glx::Context *context)
{
int profileMask = 0;
EGLint requestedDisplayType =
eglAttributes.get(EGL_PLATFORM_ANGLE_TYPE_ANGLE, EGL_PLATFORM_ANGLE_TYPE_DEFAULT_ANGLE);
if (requestedDisplayType == EGL_PLATFORM_ANGLE_TYPE_OPENGLES_ANGLE)
{
if (!mHasEXTCreateContextES2Profile)
{
return egl::Error(EGL_NOT_INITIALIZED,
"Cannot create an OpenGL ES platform on GLX without the "
"GLX_EXT_create_context_es_profile extension.");
}
ASSERT(mHasARBCreateContextProfile);
profileMask |= GLX_CONTEXT_ES2_PROFILE_BIT_EXT;
}
// Create a context of the requested version, if any.
gl::Version requestedVersion(
eglAttributes.get(EGL_PLATFORM_ANGLE_MAX_VERSION_MAJOR_ANGLE, EGL_DONT_CARE),
eglAttributes.get(EGL_PLATFORM_ANGLE_MAX_VERSION_MINOR_ANGLE, EGL_DONT_CARE));
if (static_cast<EGLint>(requestedVersion.major) != EGL_DONT_CARE &&
static_cast<EGLint>(requestedVersion.minor) != EGL_DONT_CARE)
{
if (!(profileMask & GLX_CONTEXT_ES2_PROFILE_BIT_EXT) &&
requestedVersion >= gl::Version(3, 2))
{
profileMask |= GLX_CONTEXT_CORE_PROFILE_BIT_ARB;
}
return createContextAttribs(config, requestedVersion, profileMask, context);
}
// It is commonly assumed that glXCreateContextAttrib will create a context
// of the highest version possible but it is not specified in the spec and
// is not true on the Mesa drivers. Instead we try to create a context per
// GL version until we succeed, starting from newer version. When the default
// platform is selected, if no desktop context can be created, we fallback to
// an ES context.
// clang-format off
const gl::Version desktopVersionsFrom3_2[] = {
gl::Version(4, 5),
gl::Version(4, 4),
gl::Version(4, 3),
gl::Version(4, 2),
gl::Version(4, 1),
gl::Version(4, 0),
gl::Version(3, 3),
gl::Version(3, 2),
};
const gl::Version desktopVersionsPre3_2[] = {
gl::Version(3, 1),
gl::Version(3, 0),
gl::Version(2, 0),
gl::Version(1, 5),
gl::Version(1, 4),
gl::Version(1, 3),
gl::Version(1, 2),
gl::Version(1, 1),
gl::Version(1, 0),
};
const gl::Version esVersionsFrom2_0[] = {
gl::Version(3, 2),
gl::Version(3, 1),
gl::Version(3, 0),
gl::Version(2, 0),
};
// clang-format on
// NOTE: below we return as soon as we're able to create a context so the
// "error" variable is EGL_SUCCESS when returned contrary to the common idiom
// of returning "error" when there is an actual error.
if (requestedDisplayType != EGL_PLATFORM_ANGLE_TYPE_OPENGLES_ANGLE)
{
for (auto &version : desktopVersionsFrom3_2)
{
egl::Error error =
createContextAttribs(config, version, GLX_CONTEXT_CORE_PROFILE_BIT_ARB, context);
if (!error.isError())
{
return error;
}
}
for (auto &version : desktopVersionsPre3_2)
{
egl::Error error = createContextAttribs(config, version, 0, context);
if (!error.isError())
{
return error;
}
}
}
if (requestedDisplayType != EGL_PLATFORM_ANGLE_TYPE_OPENGL_ANGLE)
{
for (auto &version : esVersionsFrom2_0)
{
egl::Error error =
createContextAttribs(config, version, GLX_CONTEXT_ES2_PROFILE_BIT_EXT, context);
if (!error.isError())
{
return error;
}
}
}
return egl::Error(EGL_NOT_INITIALIZED, "Could not create a backing OpenGL context.");
}
glx::Context DisplayGLX::initializeContext(glx::FBConfig config,
const egl::AttributeMap &eglAttributes)
{
// Create a context of the requested version, if any.
EGLint requestedMajorVersion =
eglAttributes.get(EGL_PLATFORM_ANGLE_MAX_VERSION_MAJOR_ANGLE, EGL_DONT_CARE);
EGLint requestedMinorVersion =
eglAttributes.get(EGL_PLATFORM_ANGLE_MAX_VERSION_MINOR_ANGLE, EGL_DONT_CARE);
if (requestedMajorVersion != EGL_DONT_CARE && requestedMinorVersion != EGL_DONT_CARE)
{
std::vector<int> contextAttributes;
contextAttributes.push_back(GLX_CONTEXT_MAJOR_VERSION_ARB);
contextAttributes.push_back(requestedMajorVersion);
contextAttributes.push_back(GLX_CONTEXT_MINOR_VERSION_ARB);
contextAttributes.push_back(requestedMinorVersion);
contextAttributes.push_back(None);
return createContextAttribs(config, contextAttributes);
}
// It is commonly assumed that glXCreateContextAttrib will create a context
// of the highest version possible but it is not specified in the spec and
// is not true on the Mesa drivers. Instead we try to create a context per
// desktop GL version until we succeed, starting from newer version.
// clang-format off
const gl::Version desktopVersions[] = {
gl::Version(4, 5),
gl::Version(4, 4),
gl::Version(4, 3),
gl::Version(4, 2),
gl::Version(4, 1),
gl::Version(4, 0),
gl::Version(3, 3),
gl::Version(3, 2),
gl::Version(3, 1),
gl::Version(3, 0),
gl::Version(2, 0),
gl::Version(1, 5),
gl::Version(1, 4),
gl::Version(1, 3),
gl::Version(1, 2),
gl::Version(1, 1),
gl::Version(1, 0),
};
// clang-format on
bool useProfile = mGLX.hasExtension("GLX_ARB_create_context_profile");
for (size_t i = 0; i < ArraySize(desktopVersions); ++i)
{
const auto &version = desktopVersions[i];
std::vector<int> contextAttributes;
contextAttributes.push_back(GLX_CONTEXT_MAJOR_VERSION_ARB);
contextAttributes.push_back(version.major);
contextAttributes.push_back(GLX_CONTEXT_MINOR_VERSION_ARB);
contextAttributes.push_back(version.minor);
if (useProfile && version >= gl::Version(3, 2))
{
contextAttributes.push_back(GLX_CONTEXT_PROFILE_MASK_ARB);
contextAttributes.push_back(GLX_CONTEXT_CORE_PROFILE_BIT_ARB);
}
contextAttributes.push_back(None);
auto context = createContextAttribs(config, contextAttributes);
if (context)
{
return context;
}
}
return nullptr;
}
egl::Error DisplayGLX::initializeContext(glx::FBConfig config,
const egl::AttributeMap &eglAttributes,
glx::Context *context)
{
int profileMask = 0;
EGLint requestedDisplayType = static_cast<EGLint>(
eglAttributes.get(EGL_PLATFORM_ANGLE_TYPE_ANGLE, EGL_PLATFORM_ANGLE_TYPE_DEFAULT_ANGLE));
if (requestedDisplayType == EGL_PLATFORM_ANGLE_TYPE_OPENGLES_ANGLE)
{
if (!mHasEXTCreateContextES2Profile)
{
return egl::Error(EGL_NOT_INITIALIZED,
"Cannot create an OpenGL ES platform on GLX without the "
"GLX_EXT_create_context_es_profile extension.");
}
ASSERT(mHasARBCreateContextProfile);
profileMask |= GLX_CONTEXT_ES2_PROFILE_BIT_EXT;
}
// Create a context of the requested version, if any.
gl::Version requestedVersion(static_cast<EGLint>(eglAttributes.get(
EGL_PLATFORM_ANGLE_MAX_VERSION_MAJOR_ANGLE, EGL_DONT_CARE)),
static_cast<EGLint>(eglAttributes.get(
EGL_PLATFORM_ANGLE_MAX_VERSION_MINOR_ANGLE, EGL_DONT_CARE)));
if (static_cast<EGLint>(requestedVersion.major) != EGL_DONT_CARE &&
static_cast<EGLint>(requestedVersion.minor) != EGL_DONT_CARE)
{
if (!(profileMask & GLX_CONTEXT_ES2_PROFILE_BIT_EXT) &&
requestedVersion >= gl::Version(3, 2))
{
profileMask |= GLX_CONTEXT_CORE_PROFILE_BIT_ARB;
}
return createContextAttribs(config, requestedVersion, profileMask, context);
}
// It is commonly assumed that glXCreateContextAttrib will create a context
// of the highest version possible but it is not specified in the spec and
// is not true on the Mesa drivers. On Mesa, Instead we try to create a
// context per GL version until we succeed, starting from newer version.
// On both Mesa and other drivers we try to create a desktop context and fall
// back to ES context.
// The code could be simpler if the Mesa code path was used for all drivers,
// however the cost of failing a context creation can be high (3 milliseconds
// for the NVIDIA driver). The good thing is that failed context creation only
// takes 0.1 milliseconds on Mesa.
struct ContextCreationInfo
{
EGLint displayType;
int profileFlag;
Optional<gl::Version> version;
};
// clang-format off
// For regular drivers we try to create a core, compatibility, then ES context.
// Without requiring any specific version (the Optional version is undefined).
const ContextCreationInfo contextsToTry[] = {
{ EGL_PLATFORM_ANGLE_TYPE_OPENGL_ANGLE, GLX_CONTEXT_CORE_PROFILE_BIT_ARB, {} },
{ EGL_PLATFORM_ANGLE_TYPE_OPENGL_ANGLE, 0, {} },
{ EGL_PLATFORM_ANGLE_TYPE_OPENGLES_ANGLE, GLX_CONTEXT_ES2_PROFILE_BIT_EXT, {} },
};
// On Mesa we try to create a core context, except for versions below 3.2
// where it is not applicable. (and fallback to ES as well)
const ContextCreationInfo mesaContextsToTry[] = {
{ EGL_PLATFORM_ANGLE_TYPE_OPENGL_ANGLE, GLX_CONTEXT_CORE_PROFILE_BIT_ARB, { gl::Version(4, 5) } },
{ EGL_PLATFORM_ANGLE_TYPE_OPENGL_ANGLE, GLX_CONTEXT_CORE_PROFILE_BIT_ARB, { gl::Version(4, 4) } },
{ EGL_PLATFORM_ANGLE_TYPE_OPENGL_ANGLE, GLX_CONTEXT_CORE_PROFILE_BIT_ARB, { gl::Version(4, 3) } },
{ EGL_PLATFORM_ANGLE_TYPE_OPENGL_ANGLE, GLX_CONTEXT_CORE_PROFILE_BIT_ARB, { gl::Version(4, 2) } },
{ EGL_PLATFORM_ANGLE_TYPE_OPENGL_ANGLE, GLX_CONTEXT_CORE_PROFILE_BIT_ARB, { gl::Version(4, 1) } },
{ EGL_PLATFORM_ANGLE_TYPE_OPENGL_ANGLE, GLX_CONTEXT_CORE_PROFILE_BIT_ARB, { gl::Version(4, 0) } },
{ EGL_PLATFORM_ANGLE_TYPE_OPENGL_ANGLE, GLX_CONTEXT_CORE_PROFILE_BIT_ARB, { gl::Version(3, 3) } },
{ EGL_PLATFORM_ANGLE_TYPE_OPENGL_ANGLE, GLX_CONTEXT_CORE_PROFILE_BIT_ARB, { gl::Version(3, 2) } },
{ EGL_PLATFORM_ANGLE_TYPE_OPENGL_ANGLE, 0, { gl::Version(3, 1) } },
{ EGL_PLATFORM_ANGLE_TYPE_OPENGL_ANGLE, 0, { gl::Version(3, 0) } },
{ EGL_PLATFORM_ANGLE_TYPE_OPENGL_ANGLE, 0, { gl::Version(2, 0) } },
{ EGL_PLATFORM_ANGLE_TYPE_OPENGL_ANGLE, 0, { gl::Version(1, 5) } },
{ EGL_PLATFORM_ANGLE_TYPE_OPENGL_ANGLE, 0, { gl::Version(1, 4) } },
{ EGL_PLATFORM_ANGLE_TYPE_OPENGL_ANGLE, 0, { gl::Version(1, 3) } },
{ EGL_PLATFORM_ANGLE_TYPE_OPENGL_ANGLE, 0, { gl::Version(1, 2) } },
{ EGL_PLATFORM_ANGLE_TYPE_OPENGL_ANGLE, 0, { gl::Version(1, 1) } },
{ EGL_PLATFORM_ANGLE_TYPE_OPENGL_ANGLE, 0, { gl::Version(1, 0) } },
{ EGL_PLATFORM_ANGLE_TYPE_OPENGLES_ANGLE, GLX_CONTEXT_ES2_PROFILE_BIT_EXT, { gl::Version(3, 2) } },
{ EGL_PLATFORM_ANGLE_TYPE_OPENGLES_ANGLE, GLX_CONTEXT_ES2_PROFILE_BIT_EXT, { gl::Version(3, 1) } },
{ EGL_PLATFORM_ANGLE_TYPE_OPENGLES_ANGLE, GLX_CONTEXT_ES2_PROFILE_BIT_EXT, { gl::Version(3, 0) } },
{ EGL_PLATFORM_ANGLE_TYPE_OPENGLES_ANGLE, GLX_CONTEXT_ES2_PROFILE_BIT_EXT, { gl::Version(2, 0) } },
};
// clang-format on
const ContextCreationInfo *toTry = contextsToTry;
size_t toTryLength = ArraySize(contextsToTry);
if (mIsMesa)
{
toTry = mesaContextsToTry;
toTryLength = ArraySize(mesaContextsToTry);
}
// NOTE: below we return as soon as we're able to create a context so the
// "error" variable is EGL_SUCCESS when returned contrary to the common idiom
// of returning "error" when there is an actual error.
for (size_t i = 0; i < toTryLength; ++i)
{
const ContextCreationInfo &info = toTry[i];
if (requestedDisplayType != EGL_PLATFORM_ANGLE_TYPE_DEFAULT_ANGLE &&
requestedDisplayType != info.displayType)
{
continue;
}
egl::Error error = createContextAttribs(config, info.version, info.profileFlag, context);
if (!error.isError())
{
return error;
}
}
return egl::Error(EGL_NOT_INITIALIZED, "Could not create a backing OpenGL context.");
}
egl::Error DisplayGLX::initializeContext(glx::FBConfig config,
const egl::AttributeMap &eglAttributes,
glx::Context *context)
{
int profileMask = 0;
EGLint requestedDisplayType = static_cast<EGLint>(
eglAttributes.get(EGL_PLATFORM_ANGLE_TYPE_ANGLE, EGL_PLATFORM_ANGLE_TYPE_DEFAULT_ANGLE));
if (requestedDisplayType == EGL_PLATFORM_ANGLE_TYPE_OPENGLES_ANGLE)
{
if (!mHasEXTCreateContextES2Profile)
{
return egl::EglNotInitialized() << "Cannot create an OpenGL ES platform on GLX without "
"the GLX_EXT_create_context_es_profile extension.";
}
ASSERT(mHasARBCreateContextProfile);
profileMask |= GLX_CONTEXT_ES2_PROFILE_BIT_EXT;
}
// Create a context of the requested version, if any.
gl::Version requestedVersion(static_cast<EGLint>(eglAttributes.get(
EGL_PLATFORM_ANGLE_MAX_VERSION_MAJOR_ANGLE, EGL_DONT_CARE)),
static_cast<EGLint>(eglAttributes.get(
EGL_PLATFORM_ANGLE_MAX_VERSION_MINOR_ANGLE, EGL_DONT_CARE)));
if (static_cast<EGLint>(requestedVersion.major) != EGL_DONT_CARE &&
static_cast<EGLint>(requestedVersion.minor) != EGL_DONT_CARE)
{
if (!(profileMask & GLX_CONTEXT_ES2_PROFILE_BIT_EXT) &&
requestedVersion >= gl::Version(3, 2))
{
profileMask |= GLX_CONTEXT_CORE_PROFILE_BIT_ARB;
}
return createContextAttribs(config, requestedVersion, profileMask, context);
}
// The only way to get a core profile context of the highest version using
// glXCreateContextAttrib is to try creationg contexts in decreasing version
// numbers. It might look that asking for a core context of version (0, 0)
// works on some driver but it create a _compatibility_ context of the highest
// version instead. The cost of failing a context creation is small (< 0.1 ms)
// on Mesa but is unfortunately a bit expensive on the Nvidia driver (~3ms).
// Also try to get any Desktop GL context, but if that fails fallback to
// asking for OpenGL ES contexts.
// NOTE: below we return as soon as we're able to create a context so the
// "error" variable is EGL_SUCCESS when returned contrary to the common idiom
// of returning "error" when there is an actual error.
for (const auto &info : GenerateContextCreationToTry(requestedDisplayType, mIsMesa))
{
int profileFlag = 0;
if (info.type == ContextCreationTry::Type::DESKTOP_CORE)
{
profileFlag |= GLX_CONTEXT_CORE_PROFILE_BIT_ARB;
}
else if (info.type == ContextCreationTry::Type::ES)
{
profileFlag |= GLX_CONTEXT_ES2_PROFILE_BIT_EXT;
}
egl::Error error = createContextAttribs(config, info.version, profileFlag, context);
if (!error.isError())
{
return error;
}
}
return egl::EglNotInitialized() << "Could not create a backing OpenGL context.";
}