glxpix.c 3.98 KB
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/* $XFree86: xc/programs/Xserver/GL/glx/glxpix.c,v 1.3 2000/09/26 15:57:02 tsi Exp $ */
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/*
** 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.
**
*/

/*
** An implementation of a glx pixmap buffer 
*/

#include "glxserver.h"
#include "glxutil.h"
#include "glxpix.h"

#include <gcstruct.h>

/* don't want to include glmath.h */
extern GLuint __glFloorLog2(GLuint);

typedef struct __GLPixBufferInfoRec {
    GCPtr pGC;
} __GLPixBufferInfo;

/* ---------------------------------------------------------- */

static GLboolean
Resize(__GLdrawableBuffer *buf, 
       GLint x, GLint y, GLuint width, GLuint height,
       __GLdrawablePrivate *glPriv, GLuint bufferMask)
{
    buf->width = width;
    buf->height = width;
    buf->byteWidth = width * buf->elementSize;
    buf->outerWidth = width;

    return GL_TRUE;
}

static void
Lock(__GLdrawableBuffer *buf, __GLdrawablePrivate *glPriv)
{
}

static void
Unlock(__GLdrawableBuffer *buf, __GLdrawablePrivate *glPriv)
{
}

static void
Free(__GLdrawableBuffer *buf, __GLdrawablePrivate *glPriv)
{
    __GLPixBufferInfo *bufferInfo;

    if (LookupIDByType((XID)(long)buf->handle, __glXPixmapRes)) {
	FreeResource((XID)(long)buf->handle, FALSE);
	buf->handle = NULL;
    }

    bufferInfo = (__GLPixBufferInfo *) buf->other;

    if (bufferInfo->pGC) {
	FreeScratchGC(bufferInfo->pGC);
    }

    __glXFree(bufferInfo);
    buf->other = NULL;
}

void
__glXInitPix(__GLdrawableBuffer *buf, __GLdrawablePrivate *glPriv, 
	     GLint bits, XID glxpixmapId, __GLXpixmap *pGlxPixmap)
{
    __GLPixBufferInfo *bufferInfo;

    buf->width = buf->height = 0;	/* to be filled during Update */
    buf->depth = bits;
    buf->size = 0;
    buf->base = NULL;
    buf->byteWidth = 0;
    buf->elementSize = ((bits-1) / 8) + 1;
    buf->elementSizeLog2 = __glFloorLog2(buf->elementSize);

    buf->handle = (void *)(long) glxpixmapId;
    pGlxPixmap->refcnt++;

    buf->resize = Resize;
    buf->lock = Lock;
    buf->unlock = Unlock;
    buf->fill = NULL;
    buf->free = Free;

    /* allocate local information */
    bufferInfo = (__GLPixBufferInfo *) __glXMalloc(sizeof(__GLPixBufferInfo));
    buf->other = (void *) bufferInfo;

    bufferInfo->pGC = CreateScratchGC(pGlxPixmap->pDraw->pScreen,
				      pGlxPixmap->pDraw->depth);
}