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#include <mbgl/renderer/renderer_backend.hpp>
#include <mbgl/renderer/backend_scope.hpp>
#include <mbgl/gl/context.hpp>
#include <mbgl/gl/extension.hpp>
#include <mbgl/gl/debugging.hpp>
#include <cassert>
namespace mbgl {
RendererBackend::RendererBackend() = default;
gl::Context& RendererBackend::getContext() {
assert(BackendScope::exists());
std::call_once(initialized, [this] {
context = std::make_unique<gl::Context>();
context->enableDebugging();
context->initializeExtensions(
std::bind(&RendererBackend::initializeExtension, this, std::placeholders::_1));
});
return *context;
}
PremultipliedImage RendererBackend::readFramebuffer(const Size& size) const {
assert(context);
return context->readFramebuffer<PremultipliedImage>(size);
}
void RendererBackend::assumeFramebufferBinding(const gl::FramebufferID fbo) {
getContext().bindFramebuffer.setCurrentValue(fbo);
if (fbo != ImplicitFramebufferBinding) {
assert(gl::value::BindFramebuffer::Get() == getContext().bindFramebuffer.getCurrentValue());
}
}
void RendererBackend::assumeViewport(int32_t x, int32_t y, const Size& size) {
getContext().viewport.setCurrentValue({ x, y, size });
assert(gl::value::Viewport::Get() == getContext().viewport.getCurrentValue());
}
void RendererBackend::assumeScissorTest(bool enabled) {
getContext().scissorTest.setCurrentValue(enabled);
assert(gl::value::ScissorTest::Get() == getContext().scissorTest.getCurrentValue());
}
bool RendererBackend::implicitFramebufferBound() {
return getContext().bindFramebuffer.getCurrentValue() == ImplicitFramebufferBinding;
}
void RendererBackend::setFramebufferBinding(const gl::FramebufferID fbo) {
getContext().bindFramebuffer = fbo;
if (fbo != ImplicitFramebufferBinding) {
assert(gl::value::BindFramebuffer::Get() == getContext().bindFramebuffer.getCurrentValue());
}
}
void RendererBackend::setViewport(int32_t x, int32_t y, const Size& size) {
getContext().viewport = { x, y, size };
assert(gl::value::Viewport::Get() == getContext().viewport.getCurrentValue());
}
void RendererBackend::setScissorTest(bool enabled) {
getContext().scissorTest = enabled;
assert(gl::value::ScissorTest::Get() == getContext().scissorTest.getCurrentValue());
}
RendererBackend::~RendererBackend() = default;
} // namespace mbgl
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