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