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#include <mbgl/gl/headless_backend.hpp>
#include <mbgl/gl/headless_display.hpp>
#include <mbgl/gl/context.hpp>
#include <mbgl/renderer/backend_scope.hpp>
#include <cassert>
#include <stdexcept>
#include <type_traits>
namespace mbgl {
class HeadlessBackend::View {
public:
View(gl::Context& context, Size size)
: color(context.createRenderbuffer<gl::RenderbufferType::RGBA>(size)),
depthStencil(context.createRenderbuffer<gl::RenderbufferType::DepthStencil>(size)),
framebuffer(context.createFramebuffer(color, depthStencil)) {
}
gl::Renderbuffer<gl::RenderbufferType::RGBA> color;
gl::Renderbuffer<gl::RenderbufferType::DepthStencil> depthStencil;
gl::Framebuffer framebuffer;
};
HeadlessBackend::HeadlessBackend(Size size_)
: size(size_) {
}
HeadlessBackend::~HeadlessBackend() {
BackendScope guard { *this };
view.reset();
context.reset();
}
void HeadlessBackend::activate() {
active = true;
if (!hasContext()) {
if (!hasDisplay()) {
throw std::runtime_error("Display is not set");
}
createContext();
}
assert(hasContext());
impl->activateContext();
}
void HeadlessBackend::deactivate() {
assert(hasContext());
impl->deactivateContext();
active = false;
}
void HeadlessBackend::bind() {
gl::Context& context_ = getContext();
if (!view) {
view = std::make_unique<View>(context_, size);
}
context_.bindFramebuffer = view->framebuffer.framebuffer;
context_.scissorTest = false;
context_.viewport = { 0, 0, size };
}
void HeadlessBackend::updateAssumedState() {
// no-op
}
void HeadlessBackend::setSize(Size size_) {
size = size_;
view.reset();
}
PremultipliedImage HeadlessBackend::readStillImage() {
return getContext().readFramebuffer<PremultipliedImage>(size);
}
} // namespace mbgl
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