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backends/graphics/openglsdl/openglsdl-graphics.h

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+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#ifndef BACKENDS_GRAPHICS_OPENGLSDL_OPENGLSDL_GRAPHICS_H
+#define BACKENDS_GRAPHICS_OPENGLSDL_OPENGLSDL_GRAPHICS_H
+
+#include "backends/graphics/opengl/opengl-graphics.h"
+#include "backends/graphics/sdl/sdl-graphics.h"
+#include "backends/platform/sdl/sdl-sys.h"
+
+#include "common/array.h"
+#include "common/events.h"
+
+class OpenGLSdlGraphicsManager : public OpenGL::OpenGLGraphicsManager, public SdlGraphicsManager {
+public:
+	OpenGLSdlGraphicsManager(SdlEventSource *eventSource, SdlWindow *window);
+	virtual ~OpenGLSdlGraphicsManager();
+
+	bool hasFeature(OSystem::Feature f) const override;
+	void setFeatureState(OSystem::Feature f, bool enable) override;
+	bool getFeatureState(OSystem::Feature f) const override;
+
+	void initSize(uint w, uint h, const Graphics::PixelFormat *format) override;
+	void updateScreen() override;
+
+	float getHiDPIScreenFactor() const override;
+
+	// EventObserver API
+	bool notifyEvent(const Common::Event &event) override;
+
+	// SdlGraphicsManager API
+	void notifyVideoExpose() override;
+	void notifyResize(const int width, const int height) override;
+
+#if defined(USE_IMGUI) && SDL_VERSION_ATLEAST(2, 0, 0)
+	void *getImGuiTexture(const Graphics::Surface &image, const byte *palette, int palCount) override;
+	void freeImGuiTexture(void *texture) override;
+#endif
+
+#if SDL_VERSION_ATLEAST(2, 0, 0)
+	void destroyingWindow() override;
+#endif
+
+protected:
+	bool loadVideoMode(uint requestedWidth, uint requestedHeight, bool resizable, int antialiasing) override;
+
+	void refreshScreen() override;
+
+	void handleResizeImpl(const int width, const int height) override;
+
+	bool saveScreenshot(const Common::Path &filename) const override;
+
+	bool canSwitchFullscreen() const override;
+
+private:
+	bool setupMode(uint width, uint height);
+
+	void deinitOpenGLContext();
+
+#if SDL_VERSION_ATLEAST(2, 0, 0)
+	int _glContextProfileMask, _glContextMajor, _glContextMinor;
+
+	SDL_GLContext _glContext;
+#else
+	uint32 _lastVideoModeLoad;
+#endif
+
+#ifdef EMSCRIPTEN
+	/** 
+	 * See https://registry.khronos.org/webgl/specs/latest/1.0/#2 :
+	 * " By default, after compositing the contents of the drawing buffer shall be cleared to their default values [...]
+	 *   Techniques like synchronous drawing buffer access (e.g., calling readPixels or toDataURL in the same function
+	 *   that renders to the drawing buffer) can be used to get the contents of the drawing buffer "
+	 * 
+	 * This means we need to take the screenshot at the correct time, which we do by queueing taking the screenshot
+	 * for the next frame instead of taking it right away.
+	 */
+	bool _queuedScreenshot = false;
+	void saveScreenshot() override;
+#endif
+
+	OpenGL::ContextType _glContextType;
+	bool _resizable;
+	int _requestedAntialiasing;
+	int _effectiveAntialiasing;
+
+	uint _forceFrameUpdate = 0;
+	uint _lastRequestedWidth;
+	uint _lastRequestedHeight;
+	uint _graphicsScale;
+	bool _gotResize;
+
+	bool _vsync;
+	bool _wantsFullScreen;
+	uint _ignoreResizeEvents;
+
+	struct VideoMode {
+		VideoMode() : width(0), height(0) {}
+		VideoMode(uint w, uint h) : width(w), height(h) {}
+
+		bool operator<(const VideoMode &right) const {
+			if (width < right.width) {
+				return true;
+			} else if (width == right.width && height < right.height) {
+				return true;
+			} else {
+				return false;
+			}
+		}
+
+		bool operator==(const VideoMode &right) const {
+			return width == right.width && height == right.height;
+		}
+
+		bool operator!=(const VideoMode &right) const {
+			return !(*this == right);
+		}
+
+		uint width, height;
+	};
+	typedef Common::Array<VideoMode> VideoModeArray;
+	VideoModeArray _fullscreenVideoModes;
+
+	uint _desiredFullscreenWidth;
+	uint _desiredFullscreenHeight;
+};
+
+#endif