blob: 0bc5781a1aadc375071bbe2c8aa56451646321b0 [file] [log] [blame]
// Copyright 2019 The Dawn Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "dawn_native/opengl/OpenGLFunctions.h"
#include <cctype>
#include <tuple>
namespace dawn_native { namespace opengl {
MaybeError OpenGLFunctions::Initialize(GetProcAddress getProc) {
PFNGLGETSTRINGPROC getString = reinterpret_cast<PFNGLGETSTRINGPROC>(getProc("glGetString"));
if (getString == nullptr) {
return DAWN_DEVICE_LOST_ERROR("Couldn't load glGetString");
}
std::string version = reinterpret_cast<const char*>(getString(GL_VERSION));
if (version.find("OpenGL ES") != std::string::npos) {
// ES spec states that the GL_VERSION string will be in the following format:
// "OpenGL ES N.M vendor-specific information"
mStandard = Standard::ES;
mMajorVersion = version[10] - '0';
mMinorVersion = version[12] - '0';
// The minor version shouldn't get to two digits.
ASSERT(version.size() <= 13 || !isdigit(version[13]));
DAWN_TRY(LoadOpenGLESProcs(getProc, mMajorVersion, mMinorVersion));
} else {
// OpenGL spec states the GL_VERSION string will be in the following format:
// <version number><space><vendor-specific information>
// The version number is either of the form major number.minor number or major
// number.minor number.release number, where the numbers all have one or more
// digits
mStandard = Standard::Desktop;
mMajorVersion = version[0] - '0';
mMinorVersion = version[2] - '0';
// The minor version shouldn't get to two digits.
ASSERT(version.size() <= 3 || !isdigit(version[3]));
DAWN_TRY(LoadDesktopGLProcs(getProc, mMajorVersion, mMinorVersion));
}
InitializeSupportedGLExtensions();
return {};
}
void OpenGLFunctions::InitializeSupportedGLExtensions() {
int32_t numExtensions;
GetIntegerv(GL_NUM_EXTENSIONS, &numExtensions);
for (int32_t i = 0; i < numExtensions; ++i) {
const char* extensionName = reinterpret_cast<const char*>(GetStringi(GL_EXTENSIONS, i));
mSupportedGLExtensionsSet.insert(extensionName);
}
}
bool OpenGLFunctions::IsGLExtensionSupported(const char* extension) const {
ASSERT(extension != nullptr);
return mSupportedGLExtensionsSet.count(extension) != 0;
}
bool OpenGLFunctions::IsAtLeastGL(uint32_t majorVersion, uint32_t minorVersion) {
return mStandard == Standard::Desktop &&
std::tie(mMajorVersion, mMinorVersion) >= std::tie(majorVersion, minorVersion);
}
bool OpenGLFunctions::IsAtLeastGLES(uint32_t majorVersion, uint32_t minorVersion) {
return mStandard == Standard::ES &&
std::tie(mMajorVersion, mMinorVersion) >= std::tie(majorVersion, minorVersion);
}
}} // namespace dawn_native::opengl