56 lines
1.9 KiB
C++
56 lines
1.9 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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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() 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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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. RendererBackend implementations
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// must call the API-specific version that obtains the function pointer for this function,
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// or a null pointer if 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 =
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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(bool);
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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 match the
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// 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(bool);
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};
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} // namespace gl
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} // namespace mbgl
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