90 lines
2.9 KiB
Plaintext
90 lines
2.9 KiB
Plaintext
#import "MGLMapView+OpenGL.h"
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#import "MGLOpenGLLayer.h"
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#include <mbgl/gl/renderable_resource.hpp>
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#import <OpenGL/gl.h>
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class MGLMapViewOpenGLRenderableResource final : public mbgl::gl::RenderableResource {
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public:
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MGLMapViewOpenGLRenderableResource(MGLMapViewOpenGLImpl& backend_) : backend(backend_) {
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}
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void bind() override {
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backend.restoreFramebufferBinding();
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}
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private:
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MGLMapViewOpenGLImpl& backend;
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public:
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// The current framebuffer of the NSOpenGLLayer we are painting to.
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GLint fbo = 0;
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// The reference counted count of activation calls
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NSUInteger activationCount = 0;
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};
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MGLMapViewOpenGLImpl::MGLMapViewOpenGLImpl(MGLMapView* nativeView_)
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: MGLMapViewImpl(nativeView_),
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mbgl::gl::RendererBackend(mbgl::gfx::ContextMode::Unique),
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mbgl::gfx::Renderable(mapView.framebufferSize,
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std::make_unique<MGLMapViewOpenGLRenderableResource>(*this)) {
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// Install the OpenGL layer. Interface Builder’s synchronous drawing means
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// we can’t display a map, so don’t even bother to have a map layer.
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mapView.layer =
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mapView.isTargetingInterfaceBuilder ? [CALayer layer] : [MGLOpenGLLayer layer];
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}
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mbgl::gl::ProcAddress MGLMapViewOpenGLImpl::getExtensionFunctionPointer(const char* name) {
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static CFBundleRef framework = CFBundleGetBundleWithIdentifier(CFSTR("com.apple.opengl"));
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if (!framework) {
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throw std::runtime_error("Failed to load OpenGL framework.");
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}
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return reinterpret_cast<mbgl::gl::ProcAddress>(CFBundleGetFunctionPointerForName(
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framework, (__bridge CFStringRef)[NSString stringWithUTF8String:name]));
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}
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void MGLMapViewOpenGLImpl::activate() {
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auto& resource = getResource<MGLMapViewOpenGLRenderableResource>();
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if (resource.activationCount++) {
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return;
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}
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MGLOpenGLLayer* layer = (MGLOpenGLLayer*)mapView.layer;
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[layer.openGLContext makeCurrentContext];
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}
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void MGLMapViewOpenGLImpl::deactivate() {
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auto& resource = getResource<MGLMapViewOpenGLRenderableResource>();
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if (--resource.activationCount) {
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return;
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}
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[NSOpenGLContext clearCurrentContext];
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}
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void MGLMapViewOpenGLImpl::updateAssumedState() {
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auto& resource = getResource<MGLMapViewOpenGLRenderableResource>();
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glGetIntegerv(GL_FRAMEBUFFER_BINDING, &resource.fbo);
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assumeFramebufferBinding(resource.fbo);
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assumeViewport(0, 0, mapView.framebufferSize);
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}
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void MGLMapViewOpenGLImpl::restoreFramebufferBinding() {
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auto& resource = getResource<MGLMapViewOpenGLRenderableResource>();
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setFramebufferBinding(resource.fbo);
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setViewport(0, 0, mapView.framebufferSize);
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}
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mbgl::PremultipliedImage MGLMapViewOpenGLImpl::readStillImage() {
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return readFramebuffer(mapView.framebufferSize);
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}
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CGLContextObj MGLMapViewOpenGLImpl::getCGLContextObj() {
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MGLOpenGLLayer* layer = (MGLOpenGLLayer*)mapView.layer;
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return layer.openGLContext.CGLContextObj;
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}
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