47 lines
1.1 KiB
C++
47 lines
1.1 KiB
C++
#include <mbgl/gl/headless_backend.hpp>
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#include <mbgl/util/logging.hpp>
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#include <GL/osmesa.h>
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#include <cassert>
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namespace mbgl {
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struct OSMesaImpl : public HeadlessBackend::Impl {
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OSMesaImpl() {
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#if OSMESA_MAJOR_VERSION * 100 + OSMESA_MINOR_VERSION >= 305
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glContext = OSMesaCreateContextExt(OSMESA_RGBA, 16, 0, 0, nullptr);
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#else
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glContext = OSMesaCreateContext(OSMESA_RGBA, nullptr);
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#endif
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if (glContext == nullptr) {
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throw std::runtime_error("Error creating GL context object.");
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}
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}
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~OSMesaImpl() final {
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OSMesaDestroyContext(glContext);
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}
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void activateContext() final {
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if (!OSMesaMakeCurrent(glContext, &fakeBuffer, GL_UNSIGNED_BYTE, 1, 1)) {
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throw std::runtime_error("Switching OpenGL context failed.\n");
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}
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}
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private:
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OSMesaContext glContext = nullptr;
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GLubyte fakeBuffer = 0;
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};
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gl::ProcAddress HeadlessBackend::initializeExtension(const char* name) {
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return OSMesaGetProcAddress(name);
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}
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void HeadlessBackend::createContext() {
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assert(!hasContext());
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impl = std::make_unique<OSMesaImpl>();
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}
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} // namespace mbgl
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