mirror of
https://github.com/PixarAnimationStudios/OpenSubdiv
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f3f28995a5
At build time, the preprocessor symbols: OSD_USES_GLEW or OSD_USES_INTERNAL_GLAPILOADER determine the GL API loader that will be used by the OSD library.
80 lines
2.2 KiB
C++
80 lines
2.2 KiB
C++
//
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// Copyright 2020 Pixar
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//
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// Licensed under the Apache License, Version 2.0 (the "Apache License")
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// with the following modification; you may not use this file except in
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// compliance with the Apache License and the following modification to it:
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// Section 6. Trademarks. is deleted and replaced with:
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//
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// 6. Trademarks. This License does not grant permission to use the trade
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// names, trademarks, service marks, or product names of the Licensor
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// and its affiliates, except as required to comply with Section 4(c) of
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// the License and to reproduce the content of the NOTICE file.
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//
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// You may obtain a copy of the Apache License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the Apache License with the above modification is
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// distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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// KIND, either express or implied. See the Apache License for the specific
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// language governing permissions and limitations under the Apache License.
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//
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#include "glLoader.h"
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#include <stdio.h>
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#include <stdlib.h>
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namespace OpenSubdiv {
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namespace internal {
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namespace GLLoader {
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bool
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applicationInitializeGL()
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{
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#if defined(OSD_USES_INTERNAL_GLAPILOADER)
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// -- GLAPILOADER
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return OpenSubdiv::internal::GLApi::glApiLoad();
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#elif defined(OSD_USES_GLEW)
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// -- GLEW
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#define CORE_PROFILE
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#ifdef CORE_PROFILE
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// this is the only way to initialize GLEW (before GLEW 1.13)
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// correctly under core profile context.
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glewExperimental = true;
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#endif
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GLenum status = glewInit();
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if (status != GLEW_OK) {
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printf("Failed to initialize glew. Error = %s\n",
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glewGetErrorString(status));
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return false;
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}
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#ifdef CORE_PROFILE
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// clear GL errors which were generated during glewInit()
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glGetError();
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#endif
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#endif
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return true;
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}
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bool
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libraryInitializeGL()
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{
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#if defined(OSD_USES_INTERNAL_GLAPILOADER)
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return OpenSubdiv::internal::GLApi::glApiLoad();
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#else
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// otherwise do nothing
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return true;
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#endif
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}
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} // namespace GLLoader
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} // namespace internal
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} // namespace OpenSubdiv
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