Add basic EGL support

src/Nazara/OpenGLRenderer/Wrapper/Win32/EGLContextWin32.cpp

@@ -0,0 +1,83 @@
+// 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
+
+#include <Nazara/OpenGLRenderer/Wrapper/Win32/EGLContextWin32.hpp>
+#include <Nazara/OpenGLRenderer/Wrapper/EGL/EGLLoader.hpp>
+#include <Nazara/OpenGLRenderer/Debug.hpp>
+
+namespace Nz::GL
+{
+	bool EGLContextWin32::Create(const ContextParams& params, const EGLContextBase* shareContext)
+	{
+		// It seems context sharing between pbuffer context and window context doesn't work, create an hidden window to handle this
+		HWNDHandle window(::CreateWindowA("STATIC", nullptr, WS_DISABLED | WS_POPUP, 0, 0, 1, 1, nullptr, nullptr, GetModuleHandle(nullptr), nullptr));
+		if (!window)
+		{
+			NazaraError("failed to create dummy window: " + Error::GetLastSystemError());
+			return false;
+		}
+
+		::ShowWindow(window.get(), FALSE);
+
+		WindowHandle windowHandle;
+		windowHandle.type = WindowManager::Windows;
+		windowHandle.windows.window = window.get();
+
+		if (!Create(params, windowHandle, shareContext))
+			return false;
+
+		m_ownedWindow = std::move(window);
+
+		return true;
+	}
+
+	bool EGLContextWin32::Create(const ContextParams& params, WindowHandle window, const EGLContextBase* shareContext)
+	{
+		assert(window.type == WindowManager::Windows);
+
+		Destroy(); //< In case a previous display or surface hasn't been released
+
+		m_params = params;
+
+		if (!BindAPI())
+			return false;
+
+		HWND windowHandle = static_cast<HWND>(window.windows.window);
+		HDC deviceContext = ::GetDC(windowHandle);
+		if (!deviceContext)
+		{
+			NazaraError("failed to retrieve window device context: " + Error::GetLastSystemError());
+			return false;
+		}
+
+		m_display = m_loader.eglGetDisplay(deviceContext);
+		if (!InitDisplay())
+			return false;
+
+		std::size_t configCount;
+		std::array<EGLConfig, 0xFF> configs;
+		if (!ChooseConfig(configs.data(), configs.size(), &configCount))
+			return false;
+
+		EGLint surfaceAttributes[] = {
+			EGL_NONE
+		};
+
+		std::size_t configIndex = 0;
+		for (; configIndex < configCount; ++configIndex)
+		{
+			m_surface = m_loader.eglCreateWindowSurface(m_display, configs[configIndex], windowHandle, surfaceAttributes);
+			if (m_surface)
+				break;
+		}
+
+		return CreateInternal(configs[configIndex], shareContext);
+	}
+
+	void EGLContextWin32::Destroy()
+	{
+		EGLContextBase::Destroy();
+		m_ownedWindow.reset();
+	}
+}