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#include <mbgl/gl/offscreen_view.hpp>
#include <mbgl/gl/context.hpp>
#include <mbgl/gl/framebuffer.hpp>
#include <mbgl/gl/renderbuffer.hpp>
#include <mbgl/util/optional.hpp>
#include <cstring>
#include <cassert>
namespace mbgl {
class OffscreenView::Impl {
public:
Impl(gl::Context& context_, const Size size_) : context(context_), size(std::move(size_)) {
assert(!size.isEmpty());
}
void bind() {
if (!framebuffer) {
color = context.createRenderbuffer<gl::RenderbufferType::RGBA>(size);
depthStencil = context.createRenderbuffer<gl::RenderbufferType::DepthStencil>(size);
framebuffer = context.createFramebuffer(*color, *depthStencil);
} else {
context.bindFramebuffer = framebuffer->framebuffer;
}
context.viewport = { 0, 0, size };
}
PremultipliedImage readStillImage() {
return context.readFramebuffer<PremultipliedImage>(size);
}
const Size& getSize() const {
return size;
}
private:
gl::Context& context;
const Size size;
optional<gl::Framebuffer> framebuffer;
optional<gl::Renderbuffer<gl::RenderbufferType::RGBA>> color;
optional<gl::Renderbuffer<gl::RenderbufferType::DepthStencil>> depthStencil;
};
OffscreenView::OffscreenView(gl::Context& context, const Size size)
: impl(std::make_unique<Impl>(context, std::move(size))) {
}
OffscreenView::~OffscreenView() = default;
void OffscreenView::bind() {
impl->bind();
}
PremultipliedImage OffscreenView::readStillImage() {
return impl->readStillImage();
}
const Size& OffscreenView::getSize() const {
return impl->getSize();
}
} // namespace mbgl
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