Add basic EGL support

include/Nazara/OpenGLRenderer/Wrapper/EGL/EGLContextBase.hpp

@@ -0,0 +1,79 @@
+// Copyright (C) 2020 Jérôme Leclercq
+// This file is part of the "Nazara Engine - OpenGL Renderer"
+// For conditions of distribution and use, see copyright notice in Config.hpp
+
+#pragma once
+
+#ifndef NAZARA_OPENGLRENDERER_EGLCONTEXT_HPP
+#define NAZARA_OPENGLRENDERER_EGLCONTEXT_HPP
+
+#include <Nazara/Prerequisites.hpp>
+#include <Nazara/Core/DynLib.hpp>
+#include <Nazara/Platform/WindowHandle.hpp>
+#include <Nazara/OpenGLRenderer/Config.hpp>
+#include <Nazara/OpenGLRenderer/Wrapper/Context.hpp>
+#include <Nazara/OpenGLRenderer/Wrapper/EGL/EGLFunctions.hpp>
+#include <string>
+#include <type_traits>
+#include <unordered_set>
+
+namespace Nz::GL
+{
+	class EGLLoader;
+
+	// This class isn't called EGLContext to prevent a conflict with EGLContext from EGL
+	class NAZARA_OPENGLRENDERER_API EGLContextBase : public Context
+	{
+		public:
+			inline EGLContextBase(const OpenGLDevice* device, const EGLLoader& loader);
+			EGLContextBase(const EGLContextBase&) = delete;
+			EGLContextBase(EGLContextBase&&) = delete;
+			~EGLContextBase();
+
+			virtual bool Create(const ContextParams& params, const EGLContextBase* shareContext = nullptr);
+			virtual bool Create(const ContextParams& params, WindowHandle window, const EGLContextBase* shareContext = nullptr);
+			virtual void Destroy();
+
+			void EnableVerticalSync(bool enabled) override;
+
+			inline bool HasPlatformExtension(const std::string& str) const;
+
+			void SwapBuffers() override;
+
+			EGLContextBase& operator=(const EGLContextBase&) = delete;
+			EGLContextBase& operator=(EGLContextBase&&) = delete;
+
+		protected:
+			bool BindAPI();
+			bool ChooseConfig(EGLConfig* configs, std::size_t maxConfigCount, std::size_t* configCount);
+			bool CreateInternal(EGLConfig config, const EGLContextBase* shareContext = nullptr);
+			bool InitDisplay();
+
+			const EGLLoader& m_loader;
+			EGLDisplay m_display;
+			EGLSurface m_surface;
+
+		private:
+			bool ImplementFallback(const std::string_view& function) override;
+
+			bool Activate() const override;
+			void Desactivate() const override;
+			const Loader& GetLoader() override;
+			bool LoadEGLExt();
+
+			struct Fallback
+			{
+				using glClearDepthProc = void(*)(double depth);
+
+				glClearDepthProc glClearDepth;
+			};
+			Fallback fallbacks; //< m_ omitted
+
+			std::unordered_set<std::string> m_supportedPlatformExtensions;
+			EGLContext m_handle;
+	};
+}
+
+#include <Nazara/OpenGLRenderer/Wrapper/EGL/EGLContextBase.inl>
+
+#endif