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