glxext.c

Mesa is an open-source implementation of the OpenGL specification - a system for rendering interacti

/*
 * SGI FREE SOFTWARE LICENSE B (Version 2.0, Sept. 18, 2008)
 * Copyright (C) 1991-2000 Silicon Graphics, Inc. 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 including the dates of first publication and
 * either this permission notice or a reference to
 * http://oss.sgi.com/projects/FreeB/
 * 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
 * SILICON GRAPHICS, INC. 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.
 *
 * Except as contained in this notice, the name of Silicon Graphics, Inc.
 * shall not be used in advertising or otherwise to promote the sale, use or
 * other dealings in this Software without prior written authorization from
 * Silicon Graphics, Inc.
 */

/**
 * \file glxext.c
 * GLX protocol interface boot-strap code.
 *
 * Direct rendering support added by Precision Insight, Inc.
 *
 * \author Kevin E. Martin <[e-mail]>
 */     

#include "glxclient.h"
#include <X11/extensions/Xext.h>
#include <X11/extensions/extutil.h>
#include "glapi.h"
#include "glxextensions.h"
#include "glcontextmodes.h"
#include "glheader.h"

#ifdef USE_XCB
#include <X11/Xlib-xcb.h>
#include <xcb/xcb.h>
#include <xcb/glx.h>
#endif


#ifdef DEBUG
void __glXDumpDrawBuffer(__GLXcontext *ctx);
#endif

#ifdef USE_SPARC_ASM
static void _glx_mesa_init_sparc_glapi_relocs(void);
static int _mesa_sparc_needs_init = 1;
#define INIT_MESA_SPARC { \
    if(_mesa_sparc_needs_init) { \
      _glx_mesa_init_sparc_glapi_relocs(); \
      _mesa_sparc_needs_init = 0; \
  } \
}
#else
#define INIT_MESA_SPARC
#endif

/*
** You can set this cell to 1 to force the gl drawing stuff to be
** one command per packet
*/
_X_HIDDEN int __glXDebug = 0;

/* Extension required boiler plate */

static char *__glXExtensionName = GLX_EXTENSION_NAME;
XExtensionInfo *__glXExtensionInfo = NULL;

static /* const */ char *error_list[] = {
    "GLXBadContext",
    "GLXBadContextState",
    "GLXBadDrawable",
    "GLXBadPixmap",
    "GLXBadContextTag",
    "GLXBadCurrentWindow",
    "GLXBadRenderRequest",
    "GLXBadLargeRequest",
    "GLXUnsupportedPrivateRequest",
    "GLXBadFBConfig",
    "GLXBadPbuffer",
    "GLXBadCurrentDrawable",
    "GLXBadWindow",
};

static int __glXCloseDisplay(Display *dpy, XExtCodes *codes)
{
  GLXContext gc;

  gc = __glXGetCurrentContext();
  if (dpy == gc->currentDpy) {
    __glXSetCurrentContextNull();
    __glXFreeContext(gc);
  }

  return XextRemoveDisplay(__glXExtensionInfo, dpy);
}


static XEXT_GENERATE_ERROR_STRING(__glXErrorString, __glXExtensionName,
				  __GLX_NUMBER_ERRORS, error_list)

static /* const */ XExtensionHooks __glXExtensionHooks = {
    NULL,				/* create_gc */
    NULL,				/* copy_gc */
    NULL,				/* flush_gc */
    NULL,				/* free_gc */
    NULL,				/* create_font */
    NULL,				/* free_font */
    __glXCloseDisplay,			/* close_display */
    NULL,				/* wire_to_event */
    NULL,				/* event_to_wire */
    NULL,				/* error */
    __glXErrorString,			/* error_string */
};

static
XEXT_GENERATE_FIND_DISPLAY(__glXFindDisplay, __glXExtensionInfo,
			   __glXExtensionName, &__glXExtensionHooks,
			   __GLX_NUMBER_EVENTS, NULL)

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

/*
** Free the per screen configs data as well as the array of
** __glXScreenConfigs.
*/
static void FreeScreenConfigs(__GLXdisplayPrivate *priv)
{
    __GLXscreenConfigs *psc;
    GLint i, screens;

    /* Free screen configuration information */
    psc = priv->screenConfigs;
    screens = ScreenCount(priv->dpy);
    for (i = 0; i < screens; i++, psc++) {
	if (psc->configs) {
	    _gl_context_modes_destroy( psc->configs );
	    if (psc->effectiveGLXexts)
		Xfree(psc->effectiveGLXexts);
	    psc->configs = NULL;	/* NOTE: just for paranoia */
	}
        if (psc->visuals) {
            _gl_context_modes_destroy( psc->visuals );
            psc->visuals = NULL;  /* NOTE: just for paranoia */
        }
 	Xfree((char*) psc->serverGLXexts);

#ifdef GLX_DIRECT_RENDERING
	if (psc->driScreen) {
	    psc->driScreen->destroyScreen(psc);
	    __glxHashDestroy(psc->drawHash);
            XFree(psc->driScreen);
            psc->driScreen = NULL;
	}
#endif
    }
    XFree((char*) priv->screenConfigs);
    priv->screenConfigs = NULL;
}

/*
** Release the private memory referred to in a display private
** structure.  The caller will free the extension structure.
*/
static int __glXFreeDisplayPrivate(XExtData *extension)
{
    __GLXdisplayPrivate *priv;

    priv = (__GLXdisplayPrivate*) extension->private_data;
    FreeScreenConfigs(priv);
    if(priv->serverGLXvendor) {
	Xfree((char*)priv->serverGLXvendor);
	priv->serverGLXvendor = 0x0; /* to protect against double free's */
    }
    if(priv->serverGLXversion) {
	Xfree((char*)priv->serverGLXversion);
	priv->serverGLXversion = 0x0; /* to protect against double free's */
    }

#ifdef GLX_DIRECT_RENDERING
    /* Free the direct rendering per display data */
    if (priv->driswDisplay)
	(*priv->driswDisplay->destroyDisplay)(priv->driswDisplay);
    priv->driswDisplay = NULL;

    if (priv->driDisplay)
	(*priv->driDisplay->destroyDisplay)(priv->driDisplay);
    priv->driDisplay = NULL;
#endif

    Xfree((char*) priv);
    return 0;
}

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

/*
** Query the version of the GLX extension.  This procedure works even if
** the client extension is not completely set up.
*/
static Bool QueryVersion(Display *dpy, int opcode, int *major, int *minor)
{
    xGLXQueryVersionReq *req;
    xGLXQueryVersionReply reply;

    /* Send the glXQueryVersion request */
    LockDisplay(dpy);
    GetReq(GLXQueryVersion,req);
    req->reqType = opcode;
    req->glxCode = X_GLXQueryVersion;
    req->majorVersion = GLX_MAJOR_VERSION;
    req->minorVersion = GLX_MINOR_VERSION;
    _XReply(dpy, (xReply*) &reply, 0, False);
    UnlockDisplay(dpy);
    SyncHandle();

    if (reply.majorVersion != GLX_MAJOR_VERSION) {
	/*
	** The server does not support the same major release as this
	** client.
	*/
	return GL_FALSE;
    }
    *major = reply.majorVersion;
    *minor = min(reply.minorVersion, GLX_MINOR_VERSION);
    return GL_TRUE;
}


_X_HIDDEN void 
__glXInitializeVisualConfigFromTags( __GLcontextModes *config, int count, 
				     const INT32 *bp, Bool tagged_only,
				     Bool fbconfig_style_tags )
{
    int i;

    if (!tagged_only) {
	/* Copy in the first set of properties */
	config->visualID = *bp++;

	config->visualType = _gl_convert_from_x_visual_type( *bp++ );

	config->rgbMode = *bp++;

	config->redBits = *bp++;
	config->greenBits = *bp++;
	config->blueBits = *bp++;
	config->alphaBits = *bp++;
	config->accumRedBits = *bp++;
	config->accumGreenBits = *bp++;
	config->accumBlueBits = *bp++;
	config->accumAlphaBits = *bp++;

	config->doubleBufferMode = *bp++;
	config->stereoMode = *bp++;

	config->rgbBits = *bp++;
	config->depthBits = *bp++;
	config->stencilBits = *bp++;
	config->numAuxBuffers = *bp++;
	config->level = *bp++;

	count -= __GLX_MIN_CONFIG_PROPS;
    }

    /*
    ** Additional properties may be in a list at the end
    ** of the reply.  They are in pairs of property type
    ** and property value.
    */

#define FETCH_OR_SET(tag) \
    config-> tag = ( fbconfig_style_tags ) ? *bp++ : 1

    for (i = 0; i < count; i += 2 ) {
	switch(*bp++) {
	  case GLX_RGBA:
	    FETCH_OR_SET( rgbMode );
	    break;
	  case GLX_BUFFER_SIZE:
	    config->rgbBits = *bp++;
	    break;
	  case GLX_LEVEL:
	    config->level = *bp++;
	    break;
	  case GLX_DOUBLEBUFFER:
	    FETCH_OR_SET( doubleBufferMode );
	    break;
	  case GLX_STEREO:
	    FETCH_OR_SET( stereoMode );
	    break;
	  case GLX_AUX_BUFFERS:
	    config->numAuxBuffers = *bp++;
	    break;
	  case GLX_RED_SIZE:
	    config->redBits = *bp++;
	    break;
	  case GLX_GREEN_SIZE:
	    config->greenBits = *bp++;
	    break;
	  case GLX_BLUE_SIZE:
	    config->blueBits = *bp++;
	    break;
	  case GLX_ALPHA_SIZE:
	    config->alphaBits = *bp++;
	    break;
	  case GLX_DEPTH_SIZE:
	    config->depthBits = *bp++;
	    break;
	  case GLX_STENCIL_SIZE:
	    config->stencilBits = *bp++;
	    break;
	  case GLX_ACCUM_RED_SIZE:
	    config->accumRedBits = *bp++;
	    break;
	  case GLX_ACCUM_GREEN_SIZE:
	    config->accumGreenBits = *bp++;
	    break;
	  case GLX_ACCUM_BLUE_SIZE:
	    config->accumBlueBits = *bp++;
	    break;
	  case GLX_ACCUM_ALPHA_SIZE:
	    config->accumAlphaBits = *bp++;
	    break;
	  case GLX_VISUAL_CAVEAT_EXT:
	    config->visualRating = *bp++;    
	    break;
	  case GLX_X_VISUAL_TYPE:
	    config->visualType = *bp++;
	    break;
	  case GLX_TRANSPARENT_TYPE:
	    config->transparentPixel = *bp++;    
	    break;
	  case GLX_TRANSPARENT_INDEX_VALUE:
	    config->transparentIndex = *bp++;    
	    break;
	  case GLX_TRANSPARENT_RED_VALUE:
	    config->transparentRed = *bp++;    
	    break;
	  case GLX_TRANSPARENT_GREEN_VALUE:
	    config->transparentGreen = *bp++;    
	    break;
	  case GLX_TRANSPARENT_BLUE_VALUE:
	    config->transparentBlue = *bp++;    
	    break;
	  case GLX_TRANSPARENT_ALPHA_VALUE:
	    config->transparentAlpha = *bp++;    
	    break;
	  case GLX_VISUAL_ID:
	    config->visualID = *bp++;
	    break;
	  case GLX_DRAWABLE_TYPE:
	    config->drawableType = *bp++;
	    break;
	  case GLX_RENDER_TYPE:
	    config->renderType = *bp++;
	    break;
	  case GLX_X_RENDERABLE:
	    config->xRenderable = *bp++;
	    break;
	  case GLX_FBCONFIG_ID:
	    config->fbconfigID = *bp++;
	    break;
	  case GLX_MAX_PBUFFER_WIDTH:
	    config->maxPbufferWidth = *bp++;
	    break;
	  case GLX_MAX_PBUFFER_HEIGHT:
	    config->maxPbufferHeight = *bp++;
	    break;
	  case GLX_MAX_PBUFFER_PIXELS:
	    config->maxPbufferPixels = *bp++;
	    break;
	  case GLX_OPTIMAL_PBUFFER_WIDTH_SGIX:
	    config->optimalPbufferWidth = *bp++;
	    break;
	  case GLX_OPTIMAL_PBUFFER_HEIGHT_SGIX:
	    config->optimalPbufferHeight = *bp++;
	    break;
	  case GLX_VISUAL_SELECT_GROUP_SGIX:
	    config->visualSelectGroup = *bp++;
	    break;
	  case GLX_SWAP_METHOD_OML:
	    config->swapMethod = *bp++;
	    break;
	  case GLX_SAMPLE_BUFFERS_SGIS:
	    config->sampleBuffers = *bp++;
	    break;
	  case GLX_SAMPLES_SGIS:
	    config->samples = *bp++;
	    break;
	case GLX_BIND_TO_TEXTURE_RGB_EXT:
	    config->bindToTextureRgb = *bp++;
	    break;
	case GLX_BIND_TO_TEXTURE_RGBA_EXT:
	    config->bindToTextureRgba = *bp++;
	    break;
	case GLX_BIND_TO_MIPMAP_TEXTURE_EXT:
	    config->bindToMipmapTexture = *bp++;
	    break;
	case GLX_BIND_TO_TEXTURE_TARGETS_EXT:
	    config->bindToTextureTargets = *bp++;
	    break;
	case GLX_Y_INVERTED_EXT:
	    config->yInverted = *bp++;
	    break;
	  case None:
	    i = count;
	    break;
	  default:
	    break;
	}
    }

    config->renderType = (config->rgbMode) ? GLX_RGBA_BIT : GLX_COLOR_INDEX_BIT;

    config->haveAccumBuffer = ((config->accumRedBits +
			       config->accumGreenBits +
			       config->accumBlueBits +
			       config->accumAlphaBits) > 0);
    config->haveDepthBuffer = (config->depthBits > 0);
    config->haveStencilBuffer = (config->stencilBits > 0);
}

static __GLcontextModes *
createConfigsFromProperties(Display *dpy, int nvisuals, int nprops,
			    int screen, GLboolean tagged_only)
{
    INT32 buf[__GLX_TOTAL_CONFIG], *props;
    unsigned prop_size;
    __GLcontextModes *modes, *m;
    int i;

    if (nprops == 0)
	return NULL;

    /* FIXME: Is the __GLX_MIN_CONFIG_PROPS test correct for FBconfigs? */

    /* Check number of properties */
    if (nprops < __GLX_MIN_CONFIG_PROPS || nprops > __GLX_MAX_CONFIG_PROPS)
	return NULL;

    /* Allocate memory for our config structure */
    modes = _gl_context_modes_create(nvisuals, sizeof(__GLcontextModes));
    if (!modes)
	return NULL;

    prop_size = nprops * __GLX_SIZE_INT32;
    if (prop_size <= sizeof(buf))
	props = buf;
    else
	props = Xmalloc(prop_size);

    /* Read each config structure and convert it into our format */
    m = modes;
    for (i = 0; i < nvisuals; i++) {
	_XRead(dpy, (char *)props, prop_size);
	/* Older X servers don't send this so we default it here. */
	m->drawableType = GLX_WINDOW_BIT;
	__glXInitializeVisualConfigFromTags(m, nprops, props,
					    tagged_only, GL_TRUE);
	m->screen = screen;
	m = m->next;
    }

    if (props != buf)
	Xfree(props);

    return modes;
}

static GLboolean
getVisualConfigs(Display *dpy, __GLXdisplayPrivate *priv, int screen)
{
    xGLXGetVisualConfigsReq *req;
    __GLXscreenConfigs *psc;
    xGLXGetVisualConfigsReply reply;
    
    LockDisplay(dpy);

    psc = priv->screenConfigs + screen;
    psc->visuals = NULL;
    GetReq(GLXGetVisualConfigs, req);
    req->reqType = priv->majorOpcode;
    req->glxCode = X_GLXGetVisualConfigs;
    req->screen = screen;

    if (!_XReply(dpy, (xReply*) &reply, 0, False))
	goto out;

    psc->visuals = createConfigsFromProperties(dpy,
					       reply.numVisuals,
					       reply.numProps,
					       screen, GL_FALSE);