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#include <mbgl/platform/default/headless_backend.hpp>
#include <mbgl/platform/log.hpp>
namespace mbgl {
gl::glProc HeadlessBackend::initializeExtension(const char* name) {
return OSMesaGetProcAddress(name);
}
void HeadlessBackend::createContext() {
if (glContext == nullptr) {
#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) {
Log::Error(Event::OpenGL, "failed to create OSMesa context");
}
}
if (glContext == nullptr) {
throw std::runtime_error("Error creating GL context object.");
}
}
void HeadlessBackend::destroyContext() {
if (glContext) {
if (glContext != OSMesaGetCurrentContext()) {
activateContext();
}
OSMesaDestroyContext(glContext);
glContext = nullptr;
}
}
void HeadlessBackend::activateContext() {
if (!OSMesaMakeCurrent(glContext, &fakeBuffer, GL_UNSIGNED_BYTE, 1, 1)) {
throw std::runtime_error("Switching OpenGL context failed.\n");
}
}
void HeadlessBackend::deactivateContext() {
// no-op.
}
} // namespace mbgl
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