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