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#include <mbgl/gl/headless_backend.hpp>
#include <OpenGLES/EAGL.h>
#include <stdexcept>
namespace mbgl {
class EAGLBackendImpl : public HeadlessBackend::Impl {
public:
EAGLBackendImpl() {
glContext = [[EAGLContext alloc] initWithAPI:kEAGLRenderingAPIOpenGLES2];
if (glContext == nil) {
throw std::runtime_error("Error creating GL context object");
}
glContext.multiThreaded = YES;
}
// Required for ARC to deallocate correctly.
~EAGLBackendImpl() final = default;
gl::ProcAddress getExtensionFunctionPointer(const char* name) final {
static CFBundleRef framework = CFBundleGetBundleWithIdentifier(CFSTR("com.apple.opengles"));
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);
}
void activateContext() final {
[EAGLContext setCurrentContext:glContext];
}
void deactivateContext() final {
[EAGLContext setCurrentContext:nil];
}
private:
EAGLContext* glContext = nullptr;
};
void HeadlessBackend::createImpl() {
assert(!impl);
impl = std::make_unique<EAGLBackendImpl>();
}
} // namespace mbgl
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