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