src/Main/FrameBufferX11.cpp

// SwiftShader Software Renderer
//
// Copyright(c) 2005-2012 TransGaming Inc.
//
// All rights reserved. No part of this software may be copied, distributed, transmitted,
// transcribed, stored in a retrieval system, translated into any human or computer
// language by any means, or disclosed to third parties without the explicit written
// agreement of TransGaming Inc. Without such an agreement, no rights or licenses, express
// or implied, including but not limited to any patent rights, are granted to you.
//

// Surface.cpp: Implements the egl::Surface class, representing a drawing surface
// such as the client area of a window, including any back buffers.
// Implements EGLSurface and related functionality. [EGL 1.4] section 2.2 page 3.

#include "FrameBufferX11.hpp"

#include <sys/ipc.h>
#include <sys/shm.h>
#include <string.h>

namespace sw
{
	FrameBufferX11::FrameBufferX11(Window window, int width, int height) : FrameBuffer(width, height, false, false), x_window(window)
	{
		x_display = XOpenDisplay(0);
		int screen = DefaultScreen(x_display);
		x_gc = XDefaultGC(x_display, screen);
		Visual *x_visual = XDefaultVisual(x_display, screen);
		int depth = XDefaultDepth(x_display, screen);
		
		mit_shm = XShmQueryExtension(x_display) == True;
			
		if(!mit_shm)
		{
			buffer = new char[width * height * 4];
			x_image = XCreateImage(x_display, x_visual, depth, ZPixmap, 0, buffer, width, height, 32, width * 4);	
		}
		else
		{
			x_image = XShmCreateImage(x_display, x_visual, depth, ZPixmap, 0, &shminfo, width, height);
			
			shminfo.shmid = shmget(IPC_PRIVATE, x_image->bytes_per_line * x_image->height, IPC_CREAT | 0777);
			shminfo.shmaddr = x_image->data = buffer = (char*)shmat(shminfo.shmid, 0, 0);
			shminfo.readOnly = False;
			XShmAttach(x_display, &shminfo);
		}
	}
	
	FrameBufferX11::~FrameBufferX11()
	{
		if(!mit_shm)
		{
			x_image->data = 0;
			XDestroyImage(x_image);
			
			delete[] buffer;
			buffer = 0;
		}
		else
		{
			XShmDetach(x_display, &shminfo);
			XDestroyImage(x_image);
			shmdt(shminfo.shmaddr);
			shmctl(shminfo.shmid, IPC_RMID, 0);
		}
		
		XCloseDisplay(x_display);
	}
	
	void *FrameBufferX11::lock()
	{
		stride = x_image->bytes_per_line;
		locked = buffer;
		
		return locked;
	}
	
	void FrameBufferX11::unlock()
	{
		locked = 0;
	}
		
	void FrameBufferX11::blit(void *source, const Rect *sourceRect, const Rect *destRect, bool HDR)
	{
		copy(source, HDR);
	
		if(!mit_shm)
		{
			XPutImage(x_display, x_window, x_gc, x_image, 0, 0, 0, 0, width, height);
		}
		else
		{
			XShmPutImage(x_display, x_window, x_gc, x_image, 0, 0, 0, 0, width, height, False);
		}
	
		XSync(x_display, False);
	}
}