1 files changed, 180 insertions, 0 deletions
diff --git a/src/engine/client/backend_sdl.h b/src/engine/client/backend_sdl.h
new file mode 100644
index 00000000..de0c6bd4
--- /dev/null
+++ b/src/engine/client/backend_sdl.h
@@ -0,0 +1,180 @@
+
+#include "SDL.h"
+#include "SDL_opengl.h"
+
+#include "graphics_threaded.h"
+
+
+
+// platform dependent implementations for transfering render context from the main thread to the graphics thread
+// TODO: when SDL 1.3 comes, this can be removed
+#if defined(CONF_FAMILY_WINDOWS)
+	struct SGLContext
+	{
+		HDC m_hDC;
+		HGLRC m_hGLRC;
+	};
+
+	static SGLContext GL_GetCurrentContext()
+	{
+		SGLContext Context;
+		Context.m_hDC = wglGetCurrentDC();
+		Context.m_hGLRC = wglGetCurrentContext();
+		return Context;
+	}
+
+	static void GL_MakeCurrent(const SGLContext &Context) { wglMakeCurrent(Context.m_hDC, Context.m_hGLRC); }
+	static void GL_ReleaseContext(const SGLContext &Context) { wglMakeCurrent(Context.m_hDC, NULL); }
+	static void GL_SwapBuffers(const SGLContext &Context) { SwapBuffers(Context.m_hDC); }
+#elif defined(CONF_PLATFORM_MACOSX)
+	#error missing implementation
+#elif defined(CONF_FAMILY_UNIX)
+
+	#include <GL/glx.h>
+
+	struct SGLContext
+	{
+		Display *m_pDisplay;
+		GLXDrawable m_Drawable;
+		GLXContext m_Context;
+	};
+
+	static SGLContext GL_GetCurrentContext()
+	{
+		SGLContext Context;
+		Context.m_pDisplay = glXGetCurrentDisplay();
+		Context.m_Drawable = glXGetCurrentDrawable();
+		Context.m_Context = glXGetCurrentContext();
+		return Context;
+	}
+
+	static void GL_MakeCurrent(const SGLContext &Context) { glXMakeCurrent(Context.m_pDisplay, Context.m_Drawable, Context.m_Context); }
+	static void GL_ReleaseContext(const SGLContext &Context) { glXMakeCurrent(Context.m_pDisplay, None, 0x0); }
+	static void GL_SwapBuffers(const SGLContext &Context) { glXSwapBuffers(Context.m_pDisplay, Context.m_Drawable); }
+#else
+	#error missing implementation
+#endif
+
+
+// basic threaded backend, abstract, missing init and shutdown functions
+class CGraphicsBackend_Threaded : public IGraphicsBackend
+{
+public:
+	// constructed on the main thread, the rest of the functions is runned on the render thread
+	class ICommandProcessor
+	{
+	public:
+		virtual ~ICommandProcessor() {}
+		virtual void RunBuffer(CCommandBuffer *pBuffer) = 0;
+	};
+
+	CGraphicsBackend_Threaded();
+
+	virtual void RunBuffer(CCommandBuffer *pBuffer);
+	virtual bool IsIdle() const;
+	virtual void WaitForIdle();
+		
+protected:
+	void StartProcessor(ICommandProcessor *pProcessor);
+	void StopProcessor();
+
+private:
+	ICommandProcessor *m_pProcessor;
+	CCommandBuffer * volatile m_pBuffer;
+	volatile bool m_Shutdown;
+	semaphore m_Activity;
+	semaphore m_BufferDone;
+	void *m_pThread;
+
+	static void ThreadFunc(void *pUser);
+};
+
+// takes care of implementation independent operations
+class CCommandProcessorFragment_General
+{
+	void Cmd_Nop();
+	void Cmd_Signal(const CCommandBuffer::SCommand_Signal *pCommand);
+public:
+	bool RunCommand(const CCommandBuffer::SCommand * pBaseCommand);
+};
+
+// takes care of opengl related rendering
+class CCommandProcessorFragment_OpenGL
+{
+	GLuint m_aTextures[CCommandBuffer::MAX_TEXTURES];
+	static int TexFormatToOpenGLFormat(int TexFormat);
+
+	void SetState(const CCommandBuffer::SState &State);
+
+	void Cmd_Texture_Update(const CCommandBuffer::SCommand_Texture_Update *pCommand);
+	void Cmd_Texture_Destroy(const CCommandBuffer::SCommand_Texture_Destroy *pCommand);
+	void Cmd_Texture_Create(const CCommandBuffer::SCommand_Texture_Create *pCommand);
+	void Cmd_Clear(const CCommandBuffer::SCommand_Clear *pCommand);
+	void Cmd_Render(const CCommandBuffer::SCommand_Render *pCommand);
+	void Cmd_Screenshot(const CCommandBuffer::SCommand_Screenshot *pCommand);
+
+public:
+	CCommandProcessorFragment_OpenGL();
+
+	bool RunCommand(const CCommandBuffer::SCommand * pBaseCommand);
+};
+
+// takes care of sdl related commands
+class CCommandProcessorFragment_SDL
+{
+	// SDL stuff
+	SGLContext m_GLContext;
+public:
+	enum
+	{
+		CMD_INIT = CCommandBuffer::CMDGROUP_PLATFORM,
+		CMD_SHUTDOWN,
+	};
+
+	struct SCommand_Init : public CCommandBuffer::SCommand
+	{
+		SCommand_Init() : SCommand(CMD_INIT) {}
+		SGLContext m_Context;
+	};
+
+	struct SCommand_Shutdown : public CCommandBuffer::SCommand
+	{
+		SCommand_Shutdown() : SCommand(CMD_SHUTDOWN) {}
+	};
+
+private:
+	void Cmd_Init(const SCommand_Init *pCommand);
+	void Cmd_Shutdown(const SCommand_Shutdown *pCommand);
+	void Cmd_Swap(const CCommandBuffer::SCommand_Swap *pCommand);
+	void Cmd_VideoModes(const CCommandBuffer::SCommand_VideoModes *pCommand);
+public:
+	CCommandProcessorFragment_SDL();
+
+	bool RunCommand(const CCommandBuffer::SCommand *pBaseCommand);
+};
+
+// command processor impelementation, uses the fragments to combine into one processor
+class CCommandProcessor_SDL_OpenGL : public CGraphicsBackend_Threaded::ICommandProcessor
+{
+ 	CCommandProcessorFragment_OpenGL m_OpenGL;
+ 	CCommandProcessorFragment_SDL m_SDL;
+ 	CCommandProcessorFragment_General m_General;
+ public:
+	virtual void RunBuffer(CCommandBuffer *pBuffer);
+};
+
+// graphics backend implemented with SDL and OpenGL
+class CGraphicsBackend_SDL_OpenGL : public CGraphicsBackend_Threaded
+{
+	SDL_Surface *m_pScreenSurface;
+	ICommandProcessor *m_pProcessor;
+	SGLContext m_GLContext;
+public:
+	virtual int Init(const char *pName, int Width, int Height, int FsaaSamples, int Flags);
+	virtual int Shutdown();
+
+	virtual void Minimize();
+	virtual void Maximize();
+	virtual int WindowActive();
+	virtual int WindowOpen();
+};