75 lines
2.1 KiB
C++
75 lines
2.1 KiB
C++
#include <mbgl/gl/offscreen_texture.hpp>
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#include <mbgl/gl/renderable_resource.hpp>
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#include <mbgl/gl/context.hpp>
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#include <mbgl/gl/framebuffer.hpp>
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namespace mbgl {
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namespace gl {
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class OffscreenTextureResource final : public gl::RenderableResource {
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public:
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OffscreenTextureResource(gl::Context& context_, const Size size_, const gfx::TextureChannelDataType type_)
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: context(context_),
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size(size_),
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type(type_) {
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assert(!size.isEmpty());
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}
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~OffscreenTextureResource() noexcept override = default;
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void bind() override {
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if (!framebuffer) {
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assert(!texture);
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texture = context.createTexture(size, gfx::TexturePixelType::RGBA, type);
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framebuffer = context.createFramebuffer(*texture);
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} else {
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context.bindFramebuffer = framebuffer->framebuffer;
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}
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context.activeTextureUnit = 0;
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context.scissorTest = false;
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context.viewport = {0, 0, size};
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}
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PremultipliedImage readStillImage() {
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assert(framebuffer);
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context.bindFramebuffer = framebuffer->framebuffer;
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return context.readFramebuffer<PremultipliedImage>(size);
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}
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gfx::Texture& getTexture() {
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assert(texture);
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return *texture;
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}
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private:
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gl::Context& context;
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const Size size;
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std::optional<gfx::Texture> texture;
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const gfx::TextureChannelDataType type;
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std::optional<gl::Framebuffer> framebuffer;
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};
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OffscreenTexture::OffscreenTexture(gl::Context& context, const Size size_, const gfx::TextureChannelDataType type)
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: gfx::OffscreenTexture(size, std::make_unique<OffscreenTextureResource>(context, size_, type)) {}
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bool OffscreenTexture::isRenderable() {
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try {
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getResource<OffscreenTextureResource>().bind();
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return true;
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} catch (const std::runtime_error&) {
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return false;
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}
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}
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PremultipliedImage OffscreenTexture::readStillImage() {
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return getResource<OffscreenTextureResource>().readStillImage();
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}
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gfx::Texture& OffscreenTexture::getTexture() {
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return getResource<OffscreenTextureResource>().getTexture();
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}
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} // namespace gl
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} // namespace mbgl
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