1 #include <mbgl/renderer/renderer_backend.hpp>
2 #include <mbgl/renderer/backend_scope.hpp>
3 #include <mbgl/gl/context.hpp>
4 #include <mbgl/gl/extension.hpp>
5 #include <mbgl/gl/debugging.hpp>
6
7 #include <cassert>
8
9 namespace mbgl {
10
11 RendererBackend::RendererBackend() = default;
12
getContext()13 gl::Context& RendererBackend::getContext() {
14 assert(BackendScope::exists());
15 std::call_once(initialized, [this] {
16 context = std::make_unique<gl::Context>();
17 context->enableDebugging();
18 context->initializeExtensions(
19 std::bind(&RendererBackend::getExtensionFunctionPointer, this, std::placeholders::_1));
20 });
21 return *context;
22 }
23
readFramebuffer(const Size & size) const24 PremultipliedImage RendererBackend::readFramebuffer(const Size& size) const {
25 assert(context);
26 return context->readFramebuffer<PremultipliedImage>(size);
27 }
28
assumeFramebufferBinding(const gl::FramebufferID fbo)29 void RendererBackend::assumeFramebufferBinding(const gl::FramebufferID fbo) {
30 getContext().bindFramebuffer.setCurrentValue(fbo);
31 if (fbo != ImplicitFramebufferBinding) {
32 assert(gl::value::BindFramebuffer::Get() == getContext().bindFramebuffer.getCurrentValue());
33 }
34 }
35
assumeViewport(int32_t x,int32_t y,const Size & size)36 void RendererBackend::assumeViewport(int32_t x, int32_t y, const Size& size) {
37 getContext().viewport.setCurrentValue({ x, y, size });
38 assert(gl::value::Viewport::Get() == getContext().viewport.getCurrentValue());
39 }
40
assumeScissorTest(bool enabled)41 void RendererBackend::assumeScissorTest(bool enabled) {
42 getContext().scissorTest.setCurrentValue(enabled);
43 assert(gl::value::ScissorTest::Get() == getContext().scissorTest.getCurrentValue());
44 }
45
implicitFramebufferBound()46 bool RendererBackend::implicitFramebufferBound() {
47 return getContext().bindFramebuffer.getCurrentValue() == ImplicitFramebufferBinding;
48 }
49
setFramebufferBinding(const gl::FramebufferID fbo)50 void RendererBackend::setFramebufferBinding(const gl::FramebufferID fbo) {
51 getContext().bindFramebuffer = fbo;
52 if (fbo != ImplicitFramebufferBinding) {
53 assert(gl::value::BindFramebuffer::Get() == getContext().bindFramebuffer.getCurrentValue());
54 }
55 }
56
setViewport(int32_t x,int32_t y,const Size & size)57 void RendererBackend::setViewport(int32_t x, int32_t y, const Size& size) {
58 getContext().viewport = { x, y, size };
59 assert(gl::value::Viewport::Get() == getContext().viewport.getCurrentValue());
60 }
61
setScissorTest(bool enabled)62 void RendererBackend::setScissorTest(bool enabled) {
63 getContext().scissorTest = enabled;
64 assert(gl::value::ScissorTest::Get() == getContext().scissorTest.getCurrentValue());
65 }
66
67 RendererBackend::~RendererBackend() = default;
68
69 } // namespace mbgl
70