| // Copyright 2020 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/OpenGLVersion.h" |
| |
| #include <cctype> |
| #include <tuple> |
| |
| namespace dawn::native::opengl { |
| |
| MaybeError OpenGLVersion::Initialize(GetProcAddress getProc) { |
| PFNGLGETSTRINGPROC getString = reinterpret_cast<PFNGLGETSTRINGPROC>(getProc("glGetString")); |
| if (getString == nullptr) { |
| return DAWN_INTERNAL_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])); |
| } 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])); |
| } |
| |
| return {}; |
| } |
| |
| bool OpenGLVersion::IsDesktop() const { |
| return mStandard == Standard::Desktop; |
| } |
| |
| bool OpenGLVersion::IsES() const { |
| return mStandard == Standard::ES; |
| } |
| |
| uint32_t OpenGLVersion::GetMajor() const { |
| return mMajorVersion; |
| } |
| |
| uint32_t OpenGLVersion::GetMinor() const { |
| return mMinorVersion; |
| } |
| |
| bool OpenGLVersion::IsAtLeast(uint32_t majorVersion, uint32_t minorVersion) const { |
| return std::tie(mMajorVersion, mMinorVersion) >= std::tie(majorVersion, minorVersion); |
| } |
| |
| } // namespace dawn::native::opengl |