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#include <mbgl/gl/headless_backend.hpp>
#include <mbgl/gl/headless_display.hpp>
#include <OpenGL/OpenGL.h>
#include <CoreFoundation/CoreFoundation.h>
#include <string>
#include <stdexcept>
namespace mbgl {
struct CGLImpl : public HeadlessBackend::Impl {
CGLImpl(CGLContextObj glContext_) : glContext(glContext_) {
}
~CGLImpl() {
CGLDestroyContext(glContext);
}
void activateContext() final {
CGLError error = CGLSetCurrentContext(glContext);
if (error != kCGLNoError) {
throw std::runtime_error(std::string("Switching OpenGL context failed:") +
CGLErrorString(error) + "\n");
}
}
void deactivateContext() final {
CGLError error = CGLSetCurrentContext(nullptr);
if (error != kCGLNoError) {
throw std::runtime_error(std::string("Removing OpenGL context failed:") +
CGLErrorString(error) + "\n");
}
}
CGLContextObj glContext = nullptr;
};
gl::ProcAddress HeadlessBackend::initializeExtension(const char* name) {
static CFBundleRef framework = CFBundleGetBundleWithIdentifier(CFSTR("com.apple.opengl"));
if (!framework) {
throw std::runtime_error("Failed to load OpenGL framework.");
}
CFStringRef str = CFStringCreateWithCString(kCFAllocatorDefault, name, kCFStringEncodingASCII);
void* symbol = CFBundleGetFunctionPointerForName(framework, str);
CFRelease(str);
return reinterpret_cast<gl::ProcAddress>(symbol);
}
bool HeadlessBackend::hasDisplay() {
if (!display) {
display.reset(new HeadlessDisplay);
}
return bool(display);
}
void HeadlessBackend::createContext() {
assert(!hasContext());
CGLContextObj glContext = nullptr;
CGLError error = CGLCreateContext(display->attribute<CGLPixelFormatObj>(), nullptr, &glContext);
if (error != kCGLNoError) {
throw std::runtime_error(std::string("Error creating GL context object:") +
CGLErrorString(error) + "\n");
}
error = CGLEnable(glContext, kCGLCEMPEngine);
if (error != kCGLNoError) {
throw std::runtime_error(std::string("Error enabling OpenGL multithreading:") +
CGLErrorString(error) + "\n");
}
impl.reset(new CGLImpl(glContext));
}
} // namespace mbgl
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