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/* $XFree86: xc/programs/Xserver/GL/glx/glxfb.c,v 1.3 2001/03/21 16:29:36 dawes 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.
**
*/
/*
** An implementation of a buffer which is part of the front buffer
*/
#include "glxserver.h"
#include "glxutil.h"
#include "glxfb.h"
#include <gcstruct.h>
/* so we don'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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