63 lines
2.2 KiB
C++
63 lines
2.2 KiB
C++
#pragma once
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#include <mbgl/gfx/renderer_backend.hpp>
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#include <mbgl/util/image.hpp>
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#include <mbgl/util/size.hpp>
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#include <mbgl/util/util.hpp>
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namespace mbgl {
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class ProgramParameters;
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namespace gl {
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using ProcAddress = void (*)();
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using FramebufferID = uint32_t;
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class RendererBackend : public gfx::RendererBackend {
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public:
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RendererBackend(gfx::ContextMode);
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RendererBackend(gfx::ContextMode, const TaggedScheduler&);
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~RendererBackend() override;
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/// Called prior to rendering to update the internally assumed OpenGL state.
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virtual void updateAssumedState() = 0;
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/// One-time shader initialization
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void initShaders(gfx::ShaderRegistry&, const ProgramParameters& programParameters) override;
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protected:
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std::unique_ptr<gfx::Context> createContext() override;
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/// Called with the name of an OpenGL extension that should be loaded.
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/// RendererBackend implementations must call the API-specific version that
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/// obtains the function pointer for this function, or a null pointer if
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/// unsupported/unavailable.
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virtual ProcAddress getExtensionFunctionPointer(const char*) = 0;
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/// Reads the color pixel data from the currently bound framebuffer.
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PremultipliedImage readFramebuffer(const Size&);
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/// A constant to signal that a framebuffer is bound, but with an unknown ID.
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static constexpr const FramebufferID ImplicitFramebufferBinding = std::numeric_limits<FramebufferID>::max();
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/// Tells the renderer that OpenGL state has already been set by the windowing toolkit.
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/// It sets the internal assumed state to the supplied values.
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void assumeFramebufferBinding(FramebufferID fbo);
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void assumeViewport(int32_t x, int32_t y, const Size&);
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void assumeScissorTest(int32_t, int32_t, uint32_t, uint32_t);
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/// Returns true when assumed framebuffer binding hasn't changed from the implicit binding.
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bool implicitFramebufferBound();
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public:
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/// Triggers an OpenGL state update if the internal assumed state doesn't
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/// match the supplied values.
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void setFramebufferBinding(FramebufferID fbo);
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void setViewport(int32_t x, int32_t y, const Size&);
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void setScissorTest(int32_t, int32_t, uint32_t, uint32_t);
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};
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} // namespace gl
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} // namespace mbgl
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