1 // Copyright 2020 The Dawn Authors 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 #include "dawn_native/opengl/OpenGLVersion.h" 16 17 #include <cctype> 18 #include <tuple> 19 20 namespace dawn_native { namespace opengl { 21 Initialize(GetProcAddress getProc)22 MaybeError OpenGLVersion::Initialize(GetProcAddress getProc) { 23 PFNGLGETSTRINGPROC getString = reinterpret_cast<PFNGLGETSTRINGPROC>(getProc("glGetString")); 24 if (getString == nullptr) { 25 return DAWN_INTERNAL_ERROR("Couldn't load glGetString"); 26 } 27 28 std::string version = reinterpret_cast<const char*>(getString(GL_VERSION)); 29 30 if (version.find("OpenGL ES") != std::string::npos) { 31 // ES spec states that the GL_VERSION string will be in the following format: 32 // "OpenGL ES N.M vendor-specific information" 33 mStandard = Standard::ES; 34 mMajorVersion = version[10] - '0'; 35 mMinorVersion = version[12] - '0'; 36 37 // The minor version shouldn't get to two digits. 38 ASSERT(version.size() <= 13 || !isdigit(version[13])); 39 } else { 40 // OpenGL spec states the GL_VERSION string will be in the following format: 41 // <version number><space><vendor-specific information> 42 // The version number is either of the form major number.minor number or major 43 // number.minor number.release number, where the numbers all have one or more 44 // digits 45 mStandard = Standard::Desktop; 46 mMajorVersion = version[0] - '0'; 47 mMinorVersion = version[2] - '0'; 48 49 // The minor version shouldn't get to two digits. 50 ASSERT(version.size() <= 3 || !isdigit(version[3])); 51 } 52 53 return {}; 54 } 55 IsDesktop() const56 bool OpenGLVersion::IsDesktop() const { 57 return mStandard == Standard::Desktop; 58 } 59 IsES() const60 bool OpenGLVersion::IsES() const { 61 return mStandard == Standard::ES; 62 } 63 GetMajor() const64 uint32_t OpenGLVersion::GetMajor() const { 65 return mMajorVersion; 66 } 67 GetMinor() const68 uint32_t OpenGLVersion::GetMinor() const { 69 return mMinorVersion; 70 } 71 IsAtLeast(uint32_t majorVersion,uint32_t minorVersion) const72 bool OpenGLVersion::IsAtLeast(uint32_t majorVersion, uint32_t minorVersion) const { 73 return std::tie(mMajorVersion, mMinorVersion) >= std::tie(majorVersion, minorVersion); 74 } 75 76 }} // namespace dawn_native::opengl 77