glxcmds.c

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/* $XFree86: xc/lib/GL/glx/glxcmds.c,v 1.30 2004/01/30 20:33:06 alanh Exp $ */
/*
** License Applicability. Except to the extent portions of this file are
** made subject to an alternative license as permitted in the SGI Free
** Software License B, Version 1.1 (the "License"), the contents of this
** file are subject only to the provisions of the License. You may not use
** this file except in compliance with the License. You may obtain a copy
** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
** 
** http://oss.sgi.com/projects/FreeB
** 
** Note that, as provided in the License, the Software is distributed on an
** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
** 
** Original Code. The Original Code is: OpenGL Sample Implementation,
** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
** Copyright in any portions created by third parties is as indicated
** elsewhere herein. All Rights Reserved.
** 
** Additional Notice Provisions: The application programming interfaces
** established by SGI in conjunction with the Original Code are The
** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
** Window System(R) (Version 1.3), released October 19, 1998. This software
** was created using the OpenGL(R) version 1.2.1 Sample Implementation
** published by SGI, but has not been independently verified as being
** compliant with the OpenGL(R) version 1.2.1 Specification.
**
*/

/**
 * \file glxcmds.c
 * Client-side GLX interface.
 */

#include <inttypes.h>
#include "glxclient.h"
#include <X11/extensions/extutil.h>
#include <X11/extensions/Xext.h>
#include <assert.h>
#include <string.h>
#include "glapi.h"
#ifdef GLX_DIRECT_RENDERING
#include "indirect_init.h"
#include <X11/extensions/xf86vmode.h>
#include "xf86dri.h"
#endif
#include "glxextensions.h"
#include "glcontextmodes.h"
#include "glheader.h"
#include <sys/time.h>

static const char __glXGLXClientVendorName[] = "SGI";
static const char __glXGLXClientVersion[] = "1.4";


/****************************************************************************/
/**
 * Get the __DRIdrawable for the drawable associated with a GLXContext
 * 
 * \param dpy       The display associated with \c drawable.
 * \param drawable  GLXDrawable whose __DRIdrawable part is to be retrieved.
 * \returns  A pointer to the context's __DRIdrawable on success, or NULL if
 *           the drawable is not associated with a direct-rendering context.
 */

#ifdef GLX_DIRECT_RENDERING
static __DRIdrawable *
GetDRIDrawable( Display *dpy, GLXDrawable drawable, int * const scrn_num )
{
    __GLXdisplayPrivate * const priv = __glXInitialize(dpy);

    if ( (priv != NULL) && (priv->driDisplay.private != NULL) ) {
	const unsigned  screen_count = ScreenCount(dpy);
	unsigned   i;

	for ( i = 0 ; i < screen_count ; i++ ) {
	    __DRIscreen * const psc = &priv->screenConfigs[i].driScreen;
	    __DRIdrawable * const pdraw = (psc->private != NULL)
	       ? (*psc->getDrawable)(dpy, drawable, psc->private) : NULL;

	    if ( pdraw != NULL ) {
		if ( scrn_num != NULL ) {
		    *scrn_num = i;
		}
		return pdraw;
	    }
	}
    }

    return NULL;
}
#endif


/**
 * Get the GLX per-screen data structure associated with a GLX context.
 * 
 * \param dpy   Display for which the GLX per-screen information is to be
 *              retrieved.
 * \param scrn  Screen on \c dpy for which the GLX per-screen information is
 *              to be retrieved.
 * \returns A pointer to the GLX per-screen data if \c dpy and \c scrn
 *          specify a valid GLX screen, or NULL otherwise.
 * 
 * \todo Should this function validate that \c scrn is within the screen
 *       number range for \c dpy?
 */

static __GLXscreenConfigs *
GetGLXScreenConfigs(Display *dpy, int scrn)
{
    __GLXdisplayPrivate * const priv = __glXInitialize(dpy);

    return (priv->screenConfigs != NULL) ? &priv->screenConfigs[scrn] : NULL;
}


static int
GetGLXPrivScreenConfig( Display *dpy, int scrn, __GLXdisplayPrivate ** ppriv,
			__GLXscreenConfigs ** ppsc )
{
    /* Initialize the extension, if needed .  This has the added value
     * of initializing/allocating the display private 
     */
    
    if ( dpy == NULL ) {
	return GLX_NO_EXTENSION;
    }

    *ppriv = __glXInitialize(dpy);
    if ( *ppriv == NULL ) {
	return GLX_NO_EXTENSION;
    }

    /* Check screen number to see if its valid */
    if ((scrn < 0) || (scrn >= ScreenCount(dpy))) {
	return GLX_BAD_SCREEN;
    }

    /* Check to see if the GL is supported on this screen */
    *ppsc = &((*ppriv)->screenConfigs[scrn]);
    if ( (*ppsc)->configs == NULL ) {
	/* No support for GL on this screen regardless of visual */
	return GLX_BAD_VISUAL;
    }

    return Success;
}


/**
 * Determine if a \c GLXFBConfig supplied by the application is valid.
 *
 * \param dpy     Application supplied \c Display pointer.
 * \param config  Application supplied \c GLXFBConfig.
 *
 * \returns If the \c GLXFBConfig is valid, the a pointer to the matching
 *          \c __GLcontextModes structure is returned.  Otherwise, \c NULL
 *          is returned.
 */
static __GLcontextModes *
ValidateGLXFBConfig( Display * dpy, GLXFBConfig config )
{
    __GLXdisplayPrivate * const priv = __glXInitialize(dpy);
    const unsigned num_screens = ScreenCount(dpy);
    unsigned   i;
    const __GLcontextModes * modes;


    if ( priv != NULL ) {
	for ( i = 0 ; i < num_screens ; i++ ) {
	    for ( modes = priv->screenConfigs[i].configs
		  ; modes != NULL
		  ; modes = modes->next ) {
		if ( modes == (__GLcontextModes *) config ) {
		    return (__GLcontextModes *) config;
		}
	    }
	}
    }

    return NULL;
}


/**
 * \todo It should be possible to move the allocate of \c client_state_private
 * later in the function for direct-rendering contexts.  Direct-rendering
 * contexts don't need to track client state, so they don't need that memory
 * at all.
 * 
 * \todo Eliminate \c __glXInitVertexArrayState.  Replace it with a new
 * function called \c __glXAllocateClientState that allocates the memory and
 * does all the initialization (including the pixel pack / unpack).
 */
static
GLXContext AllocateGLXContext( Display *dpy )
{
     GLXContext gc;
     int bufSize;
     CARD8 opcode;
    __GLXattribute *state;

    if (!dpy)
        return NULL;

    opcode = __glXSetupForCommand(dpy);
    if (!opcode) {
	return NULL;
    }

    /* Allocate our context record */
    gc = (GLXContext) Xmalloc(sizeof(struct __GLXcontextRec));
    if (!gc) {
	/* Out of memory */
	return NULL;
    }
    memset(gc, 0, sizeof(struct __GLXcontextRec));

    state = Xmalloc(sizeof(struct __GLXattributeRec));
    if (state == NULL) {
	/* Out of memory */
	Xfree(gc);
	return NULL;
    }
    gc->client_state_private = state;
    memset(gc->client_state_private, 0, sizeof(struct __GLXattributeRec));
    state->NoDrawArraysProtocol = (getenv("LIBGL_NO_DRAWARRAYS") != NULL);

    /*
    ** Create a temporary buffer to hold GLX rendering commands.  The size
    ** of the buffer is selected so that the maximum number of GLX rendering
    ** commands can fit in a single X packet and still have room in the X
    ** packet for the GLXRenderReq header.
    */

    bufSize = (XMaxRequestSize(dpy) * 4) - sz_xGLXRenderReq;
    gc->buf = (GLubyte *) Xmalloc(bufSize);
    if (!gc->buf) {
	Xfree(gc->client_state_private);
	Xfree(gc);
	return NULL;
    }
    gc->bufSize = bufSize;

    /* Fill in the new context */
    gc->renderMode = GL_RENDER;

    state->storePack.alignment = 4;
    state->storeUnpack.alignment = 4;

    gc->attributes.stackPointer = &gc->attributes.stack[0];

    /*
    ** PERFORMANCE NOTE: A mode dependent fill image can speed things up.
    ** Other code uses the fastImageUnpack bit, but it is never set
    ** to GL_TRUE.
    */
    gc->fastImageUnpack = GL_FALSE;
    gc->fillImage = __glFillImage;
    gc->isDirect = GL_FALSE;
    gc->pc = gc->buf;
    gc->bufEnd = gc->buf + bufSize;
    if (__glXDebug) {
	/*
	** Set limit register so that there will be one command per packet
	*/
	gc->limit = gc->buf;
    } else {
	gc->limit = gc->buf + bufSize - __GLX_BUFFER_LIMIT_SIZE;
    }
    gc->createDpy = dpy;
    gc->majorOpcode = opcode;

    /*
    ** Constrain the maximum drawing command size allowed to be
    ** transfered using the X_GLXRender protocol request.  First
    ** constrain by a software limit, then constrain by the protocl
    ** limit.
    */
    if (bufSize > __GLX_RENDER_CMD_SIZE_LIMIT) {
        bufSize = __GLX_RENDER_CMD_SIZE_LIMIT;
    }
    if (bufSize > __GLX_MAX_RENDER_CMD_SIZE) {
        bufSize = __GLX_MAX_RENDER_CMD_SIZE;
    }
    gc->maxSmallRenderCommandSize = bufSize;
    return gc;
}


/**
 * Create a new context.  Exactly one of \c vis and \c fbconfig should be
 * non-NULL.
 * 
 * \param use_glx_1_3  For FBConfigs, should GLX 1.3 protocol or
 *                     SGIX_fbconfig protocol be used?
 * \param renderType   For FBConfigs, what is the rendering type?
 */

static GLXContext
CreateContext(Display *dpy, XVisualInfo *vis,
	      const __GLcontextModes * const fbconfig,
	      GLXContext shareList,
	      Bool allowDirect, GLXContextID contextID,
	      Bool use_glx_1_3, int renderType)
{
    GLXContext gc;

    if ( dpy == NULL )
       return NULL;

    gc = AllocateGLXContext(dpy);
    if (!gc)
	return NULL;

    if (None == contextID) {
	if ( (vis == NULL) && (fbconfig == NULL) )
	    return NULL;

#ifdef GLX_DIRECT_RENDERING
	if (allowDirect) {
	    int screen = (fbconfig == NULL) ? vis->screen : fbconfig->screen;
	    __GLXscreenConfigs * const psc = GetGLXScreenConfigs(dpy, screen);
	    const __GLcontextModes * mode;

	    /* The value of fbconfig cannot change because it is tested
	     * later in the function.
	     */
	    if ( fbconfig == NULL ) {
		/* FIXME: Is it possible for the __GLcontextModes structure
		 * FIXME: to not be found?
		 */
		mode = _gl_context_modes_find_visual( psc->configs,
						      vis->visualid );
		assert( mode != NULL );
		assert( mode->screen == screen );
	    }
	    else {
		mode = fbconfig;
	    }

	    if (psc && psc->driScreen.private) {
		void * const shared = (shareList != NULL)
		    ? shareList->driContext.private : NULL;
		gc->driContext.private = 
		  (*psc->driScreen.createNewContext)( dpy, mode, renderType,
						      shared,
						      &gc->driContext );
		if (gc->driContext.private) {
		    gc->isDirect = GL_TRUE;
		    gc->screen = mode->screen;
		    gc->vid = mode->visualID;
		    gc->fbconfigID = mode->fbconfigID;
		    gc->driContext.mode = mode;
		}
	    }
	}
#endif

	LockDisplay(dpy);
	if ( fbconfig == NULL ) {
	    xGLXCreateContextReq *req;

	    /* Send the glXCreateContext request */
	    GetReq(GLXCreateContext,req);
	    req->reqType = gc->majorOpcode;
	    req->glxCode = X_GLXCreateContext;
	    req->context = gc->xid = XAllocID(dpy);
	    req->visual = vis->visualid;
	    req->screen = vis->screen;
	    req->shareList = shareList ? shareList->xid : None;
	    req->isDirect = gc->isDirect;
	}
	else if ( use_glx_1_3 ) {
	    xGLXCreateNewContextReq *req;

	    /* Send the glXCreateNewContext request */
	    GetReq(GLXCreateNewContext,req);
	    req->reqType = gc->majorOpcode;
	    req->glxCode = X_GLXCreateNewContext;
	    req->context = gc->xid = XAllocID(dpy);
	    req->fbconfig = fbconfig->fbconfigID;
	    req->screen = fbconfig->screen;
	    req->renderType = renderType;
	    req->shareList = shareList ? shareList->xid : None;
	    req->isDirect = gc->isDirect;
	}
	else {
	    xGLXVendorPrivateWithReplyReq *vpreq;
	    xGLXCreateContextWithConfigSGIXReq *req;

	    /* Send the glXCreateNewContext request */
	    GetReqExtra(GLXVendorPrivateWithReply,
			sz_xGLXCreateContextWithConfigSGIXReq-sz_xGLXVendorPrivateWithReplyReq,vpreq);
	    req = (xGLXCreateContextWithConfigSGIXReq *)vpreq;
	    req->reqType = gc->majorOpcode;
	    req->glxCode = X_GLXVendorPrivateWithReply;
	    req->vendorCode = X_GLXvop_CreateContextWithConfigSGIX;
	    req->context = gc->xid = XAllocID(dpy);
	    req->fbconfig = fbconfig->fbconfigID;
	    req->screen = fbconfig->screen;
	    req->renderType = renderType;
	    req->shareList = shareList ? shareList->xid : None;
	    req->isDirect = gc->isDirect;
	}

	UnlockDisplay(dpy);
	SyncHandle();
	gc->imported = GL_FALSE;
    }
    else {
	gc->xid = contextID;
	gc->imported = GL_TRUE;
    }

    return gc;
}

PUBLIC GLXContext glXCreateContext(Display *dpy, XVisualInfo *vis,
				   GLXContext shareList, Bool allowDirect)
{
   return CreateContext(dpy, vis, NULL, shareList, allowDirect, None,
			False, 0);
}

void __glXFreeContext(__GLXcontext *gc)
{
    if (gc->vendor) XFree((char *) gc->vendor);
    if (gc->renderer) XFree((char *) gc->renderer);
    if (gc->version) XFree((char *) gc->version);
    if (gc->extensions) XFree((char *) gc->extensions);
    __glFreeAttributeState(gc);
    XFree((char *) gc->buf);
    Xfree((char *) gc->client_state_private);
    XFree((char *) gc);
    
}

/*
** Destroy the named context
*/
static void 
DestroyContext(Display *dpy, GLXContext gc)
{
    xGLXDestroyContextReq *req;
    GLXContextID xid;
    CARD8 opcode;
    GLboolean imported;

    opcode = __glXSetupForCommand(dpy);
    if (!opcode || !gc) {
	return;
    }

    __glXLock();
    xid = gc->xid;
    imported = gc->imported;
    gc->xid = None;

#ifdef GLX_DIRECT_RENDERING
    /* Destroy the direct rendering context */
    if (gc->isDirect) {
	if (gc->driContext.private) {
	    (*gc->driContext.destroyContext)(dpy, gc->screen,
					     gc->driContext.private);
	    gc->driContext.private = NULL;
	}
    }
#endif

    if (gc->currentDpy) {
	/* Have to free later cuz it's in use now */
	__glXUnlock();
    } else {
	/* Destroy the handle if not current to anybody */
	__glXUnlock();
	__glXFreeContext(gc);
    }

    if (!imported) {
	/* 
	** This dpy also created the server side part of the context.
	** Send the glXDestroyContext request.
	*/
	LockDisplay(dpy);
	GetReq(GLXDestroyContext,req);
	req->reqType = opcode;
	req->glxCode = X_GLXDestroyContext;
	req->context = xid;
	UnlockDisplay(dpy);
	SyncHandle();