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/* $XFree86: xc/programs/Xserver/GL/glx/glxfb.c,v 1.2 1999/06/14 07:31:27 dawes Exp $ */
/*
** The contents of this file are subject to the GLX Public License Version 1.0
** (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, 2011 N. Shoreline Blvd., Mountain View, CA 94043
** or at http://www.sgi.com/software/opensource/glx/license.html.
**
** Software distributed under the License is distributed on an "AS IS"
** basis. ALL WARRANTIES ARE DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY
** IMPLIED WARRANTIES OF MERCHANTABILITY, OF FITNESS FOR A PARTICULAR
** PURPOSE OR OF NON- INFRINGEMENT. See the License for the specific
** language governing rights and limitations under the License.
**
** The Original Software is GLX version 1.2 source code, released February,
** 1999. The developer of the Original Software is Silicon Graphics, Inc.
** Those portions of the Subject Software created by Silicon Graphics, Inc.
** are Copyright (c) 1991-9 Silicon Graphics, Inc. All Rights Reserved.
**
** $SGI$
*/
/*
** An implementation of a buffer which is part of the front buffer
*/
#include "glxserver.h"
#include "glxutil.h"
#include "glxfb.h"
#include <gcstruct.h>
/* can't include glmath.h */
extern GLuint __glFloorLog2(GLuint);
typedef struct __GLFBbufferInfoRec {
GCPtr pGC;
} __GLFBbufferInfo;
extern PixmapPtr __glXPrivPixGetPtr(__GLdrawableBuffer *);
/* ---------------------------------------------------------- */
static GLboolean
Resize(__GLdrawableBuffer *buf,
GLint x, GLint y, GLuint width, GLuint height,
__GLdrawablePrivate *glPriv, GLuint bufferMask)
{
buf->width = width;
buf->height = height;
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)
{
}
/*
** Do a swap buffer with
** a memory surface as a back buffer
** a FB surface as a front buffer
*/
GLboolean
__glXFBMemSwapBuffers(__GLXdrawablePrivate *glxPriv)
{
__GLdrawablePrivate *glPriv = &glxPriv->glPriv;
__GLdrawableBuffer *front = &glPriv->frontBuffer;
__GLdrawableBuffer *back = &glPriv->backBuffer;
__GLFBbufferInfo *bufferInfo;
GCPtr pGC;
GLint width, height, depth, pad;
GLubyte *buf;
bufferInfo = (__GLFBbufferInfo *) front->other;
pGC = bufferInfo->pGC;
width = back->width;
height = back->height;
depth = back->depth;
buf = back->base;
pad = back->outerWidth - back->width; /* back buffer padding */
/* adjust buffer padding. X wants left, GL has right */
buf -= pad;
ValidateGC(glxPriv->pDraw, pGC);
(*pGC->ops->PutImage)(glxPriv->pDraw, pGC,
depth,
0, 0, width, height,
pad, ZPixmap,
(char *)buf);
return GL_TRUE;
}
static void
Free(__GLdrawableBuffer *buf, __GLdrawablePrivate *glPriv)
{
__GLFBbufferInfo *bufferInfo;
bufferInfo = (__GLFBbufferInfo *) buf->other;
if (bufferInfo->pGC) {
FreeScratchGC(bufferInfo->pGC);
}
__glXFree(bufferInfo);
buf->other = NULL;
}
/*
** function to return the X GC of this buffer (to be used by DDX)
*/
GCPtr __glXFBGetGC(__GLdrawableBuffer *buf)
{
__GLFBbufferInfo *bufferInfo;
bufferInfo = (__GLFBbufferInfo *) buf->other;
if (bufferInfo) {
return bufferInfo->pGC;
} else {
return NULL;
}
}
void
__glXInitFB(__GLdrawableBuffer *buf, __GLdrawablePrivate *glPriv, GLint bits)
{
__GLFBbufferInfo *bufferInfo;
__GLXdrawablePrivate *glxPriv = (__GLXdrawablePrivate *) glPriv->other;
GCPtr pGC;
buf->depth = bits;
buf->width = buf->height = 0; /* to be filled during Update */
buf->handle = buf->base = NULL; /* to be filled during Update */
buf->size = 0;
buf->byteWidth = 0;
buf->elementSize = ((bits-1) / 8) + 1;
buf->elementSizeLog2 = __glFloorLog2(buf->elementSize);
buf->resize = Resize;
buf->lock = Lock;
buf->unlock = Unlock;
buf->fill = NULL;
buf->free = Free;
/* allocate local information */
bufferInfo = (__GLFBbufferInfo *) __glXMalloc(sizeof(__GLFBbufferInfo));
buf->other = (void *) bufferInfo;
pGC = CreateScratchGC(glxPriv->pDraw->pScreen,
glxPriv->pDraw->depth);
bufferInfo->pGC = pGC;
(*pGC->funcs->ChangeClip)(pGC, CT_NONE, NULL, 0);
}
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