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#include <mbgl/platform/default/headless_backend.hpp>
#include <mbgl/gl/extension.hpp>
#include <OpenGLES/EAGL.h>
#include <stdexcept>
namespace mbgl {
gl::glProc HeadlessBackend::initializeExtension(const char* name) {
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::glProc>(symbol);
}
void HeadlessBackend::createContext() {
glContext = [[EAGLContext alloc] initWithAPI:kEAGLRenderingAPIOpenGLES2];
if (glContext == nil) {
throw std::runtime_error("Error creating GL context object");
}
[reinterpret_cast<EAGLContext*>(glContext) retain];
reinterpret_cast<EAGLContext*>(glContext).multiThreaded = YES;
}
void HeadlessBackend::destroyContext() {
[reinterpret_cast<EAGLContext*>(glContext) release];
glContext = nil;
}
void HeadlessBackend::activateContext() {
[EAGLContext setCurrentContext:reinterpret_cast<EAGLContext*>(glContext)];
}
void HeadlessBackend::deactivateContext() {
[EAGLContext setCurrentContext:nil];
}
} // namespace mbgl
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