xref: /external/mesa3d/src/gallium/state_trackers/glx/xlib/xm_api.h

/*
 * Mesa 3-D graphics library
 * Version:  7.1
 *
 * Copyright (C) 1999-2007  Brian Paul   All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */



/* Sample Usage:

In addition to the usual X calls to select a visual, create a colormap
and create a window, you must do the following to use the X/Mesa interface:

1. Call XMesaCreateVisual() to make an XMesaVisual from an XVisualInfo.

2. Call XMesaCreateContext() to create an X/Mesa rendering context, given
   the XMesaVisual.

3. Call XMesaCreateWindowBuffer() to create an XMesaBuffer from an X window
   and XMesaVisual.

4. Call XMesaMakeCurrent() to bind the XMesaBuffer to an XMesaContext and
   to make the context the current one.

5. Make gl* calls to render your graphics.

6. Use XMesaSwapBuffers() when double buffering to swap front/back buffers.

7. Before the X window is destroyed, call XMesaDestroyBuffer().

8. Before exiting, call XMesaDestroyVisual and XMesaDestroyContext.

*/




#ifndef XMESA_H
#define XMESA_H


#include "mtypes.h"
#include "state_tracker/st_context.h"
#include "state_tracker/st_public.h"
#include "pipe/p_thread.h"


# include <X11/Xlib.h>
# include <X11/Xlibint.h>
# include <X11/Xutil.h>
# ifdef USE_XSHM  /* was SHM */
#  include <sys/ipc.h>
#  include <sys/shm.h>
#  include <X11/extensions/XShm.h>
# endif

typedef struct xmesa_buffer *XMesaBuffer;
typedef struct xmesa_context *XMesaContext;
typedef struct xmesa_visual *XMesaVisual;



/*
 * Create a new X/Mesa visual.
 * Input:  display - X11 display
 *         visinfo - an XVisualInfo pointer
 *         rgb_flag - GL_TRUE = RGB mode,
 *                    GL_FALSE = color index mode
 *         alpha_flag - alpha buffer requested?
 *         db_flag - GL_TRUE = double-buffered,
 *                   GL_FALSE = single buffered
 *         stereo_flag - stereo visual?
 *         ximage_flag - GL_TRUE = use an XImage for back buffer,
 *                       GL_FALSE = use an off-screen pixmap for back buffer
 *         depth_size - requested bits/depth values, or zero
 *         stencil_size - requested bits/stencil values, or zero
 *         accum_red_size - requested bits/red accum values, or zero
 *         accum_green_size - requested bits/green accum values, or zero
 *         accum_blue_size - requested bits/blue accum values, or zero
 *         accum_alpha_size - requested bits/alpha accum values, or zero
 *         num_samples - number of samples/pixel if multisampling, or zero
 *         level - visual level, usually 0
 *         visualCaveat - ala the GLX extension, usually GLX_NONE_EXT
 * Return;  a new XMesaVisual or 0 if error.
 */
extern XMesaVisual XMesaCreateVisual( Display *display,
                                      XVisualInfo * visinfo,
                                      GLboolean rgb_flag,
                                      GLboolean alpha_flag,
                                      GLboolean db_flag,
                                      GLboolean stereo_flag,
                                      GLboolean ximage_flag,
                                      GLint depth_size,
                                      GLint stencil_size,
                                      GLint accum_red_size,
                                      GLint accum_green_size,
                                      GLint accum_blue_size,
                                      GLint accum_alpha_size,
                                      GLint num_samples,
                                      GLint level,
                                      GLint visualCaveat );

/*
 * Destroy an XMesaVisual, but not the associated XVisualInfo.
 */
extern void XMesaDestroyVisual( XMesaVisual v );



/*
 * Create a new XMesaContext for rendering into an X11 window.
 *
 * Input:  visual - an XMesaVisual
 *         share_list - another XMesaContext with which to share display
 *                      lists or NULL if no sharing is wanted.
 * Return:  an XMesaContext or NULL if error.
 */
extern XMesaContext XMesaCreateContext( XMesaVisual v,
					XMesaContext share_list );


/*
 * Destroy a rendering context as returned by XMesaCreateContext()
 */
extern void XMesaDestroyContext( XMesaContext c );



/*
 * Create an XMesaBuffer from an X window.
 */
extern XMesaBuffer XMesaCreateWindowBuffer( XMesaVisual v, Window w );


/*
 * Create an XMesaBuffer from an X pixmap.
 */
extern XMesaBuffer XMesaCreatePixmapBuffer( XMesaVisual v,
					    Pixmap p,
					    Colormap cmap );


/*
 * Destroy an XMesaBuffer, but not the corresponding window or pixmap.
 */
extern void XMesaDestroyBuffer( XMesaBuffer b );


/*
 * Return the XMesaBuffer handle which corresponds to an X drawable, if any.
 *
 * New in Mesa 2.3.
 */
extern XMesaBuffer XMesaFindBuffer( Display *dpy,
				    Drawable d );



/*
 * Bind two buffers (read and draw) to a context and make the
 * context the current one.
 * New in Mesa 3.3
 */
extern GLboolean XMesaMakeCurrent2( XMesaContext c,
                                    XMesaBuffer drawBuffer,
                                    XMesaBuffer readBuffer );


/*
 * Unbind the current context from its buffer.
 */
extern GLboolean XMesaUnbindContext( XMesaContext c );


/*
 * Return a handle to the current context.
 */
extern XMesaContext XMesaGetCurrentContext( void );


/*
 * Swap the front and back buffers for the given buffer.  No action is
 * taken if the buffer is not double buffered.
 */
extern void XMesaSwapBuffers( XMesaBuffer b );


/*
 * Copy a sub-region of the back buffer to the front buffer.
 *
 * New in Mesa 2.6
 */
extern void XMesaCopySubBuffer( XMesaBuffer b,
				int x,
				int y,
				int width,
				int height );





/*
 * Flush/sync a context
 */
extern void XMesaFlush( XMesaContext c );



/*
 * Scan for XMesaBuffers whose window/pixmap has been destroyed, then free
 * any memory used by that buffer.
 *
 * New in Mesa 2.3.
 */
extern void XMesaGarbageCollect( void );



/*
 * Create a pbuffer.
 * New in Mesa 4.1
 */
extern XMesaBuffer XMesaCreatePBuffer(XMesaVisual v, Colormap cmap,
                                      unsigned int width, unsigned int height);



/*
 * Texture from Pixmap
 * New in Mesa 7.1
 */
extern void
XMesaBindTexImage(Display *dpy, XMesaBuffer drawable, int buffer,
                  const int *attrib_list);

extern void
XMesaReleaseTexImage(Display *dpy, XMesaBuffer drawable, int buffer);


extern XMesaBuffer
XMesaCreatePixmapTextureBuffer(XMesaVisual v, Pixmap p,
                               Colormap cmap,
                               int format, int target, int mipmap);




/***********************************************************************
 */

extern pipe_mutex _xmesa_lock;

extern struct xmesa_buffer *XMesaBufferList;


/**
 * Visual inforation, derived from GLvisual.
 * Basically corresponds to an XVisualInfo.
 */
struct xmesa_visual {
   GLvisual mesa_visual;	/* Device independent visual parameters */
   Display *display;	/* The X11 display */
   XVisualInfo * visinfo;	/* X's visual info (pointer to private copy) */
   XVisualInfo *vishandle;	/* Only used in fakeglx.c */
   GLint BitsPerPixel;		/* True bits per pixel for XImages */

   GLboolean ximage_flag;	/* Use XImage for back buffer (not pixmap)? */
};


/**
 * Context info, derived from st_context.
 * Basically corresponds to a GLXContext.
 */
struct xmesa_context {
   struct st_context *st;
   XMesaVisual xm_visual;	/** pixel format info */
   XMesaBuffer xm_buffer;	/** current drawbuffer */
   XMesaBuffer xm_read_buffer;  /** current readbuffer */
};


/**
 * Types of X/GLX drawables we might render into.
 */
typedef enum {
   WINDOW,          /* An X window */
   GLXWINDOW,       /* GLX window */
   PIXMAP,          /* GLX pixmap */
   PBUFFER          /* GLX Pbuffer */
} BufferType;


/**
 * Framebuffer information, derived from.
 * Basically corresponds to a GLXDrawable.
 */
struct xmesa_buffer {
   struct st_framebuffer *stfb;

   GLboolean wasCurrent;	/* was ever the current buffer? */
   XMesaVisual xm_visual;	/* the X/Mesa visual */
   Drawable drawable;	/* Usually the X window ID */
   Colormap cmap;		/* the X colormap */
   BufferType type;             /* window, pixmap, pbuffer or glxwindow */

   XImage *tempImage;
   unsigned long selectedEvents;/* for pbuffers only */

   GLuint shm;			/* X Shared Memory extension status:	*/
				/*    0 = not available			*/
				/*    1 = XImage support available	*/
				/*    2 = Pixmap support available too	*/
#if defined(USE_XSHM)
   XShmSegmentInfo shminfo;
#endif

   GC gc;			/* scratch GC for span, line, tri drawing */

   /* GLX_EXT_texture_from_pixmap */
   GLint TextureTarget; /** GLX_TEXTURE_1D_EXT, for example */
   GLint TextureFormat; /** GLX_TEXTURE_FORMAT_RGB_EXT, for example */
   GLint TextureMipmap; /** 0 or 1 */

   struct xmesa_buffer *Next;	/* Linked list pointer: */
};



/** cast wrapper */
static INLINE XMesaContext
xmesa_context(GLcontext *ctx)
{
   return (XMesaContext) ctx->DriverCtx;
}


/** cast wrapper */
static INLINE XMesaBuffer
xmesa_buffer(GLframebuffer *fb)
{
   struct st_framebuffer *stfb = (struct st_framebuffer *) fb;
   return (XMesaBuffer) st_framebuffer_private(stfb);
}


extern void
xmesa_delete_framebuffer(struct gl_framebuffer *fb);

extern XMesaBuffer
xmesa_find_buffer(Display *dpy, Colormap cmap, XMesaBuffer notThis);

extern void
xmesa_check_and_update_buffer_size(XMesaContext xmctx, XMesaBuffer drawBuffer);

extern void
xmesa_destroy_buffers_on_display(Display *dpy);

static INLINE GLuint
xmesa_buffer_width(XMesaBuffer b)
{
   return b->stfb->Base.Width;
}

static INLINE GLuint
xmesa_buffer_height(XMesaBuffer b)
{
   return b->stfb->Base.Height;
}

extern int
xmesa_check_for_xshm(Display *display);


#endif