180 lines
5.2 KiB
C
180 lines
5.2 KiB
C
/* $XFree86: xc/programs/Xserver/GL/glx/glxfb.c,v 1.3 2001/03/21 16:29:36 dawes Exp $ */
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/*
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** License Applicability. Except to the extent portions of this file are
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** made subject to an alternative license as permitted in the SGI Free
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** Software License B, Version 1.1 (the "License"), the contents of this
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** file are subject only to the provisions of the License. You may not use
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** this file except in compliance with the License. You may obtain a copy
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** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
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** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
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**
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** http://oss.sgi.com/projects/FreeB
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**
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** Note that, as provided in the License, the Software is distributed on an
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** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
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** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
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** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
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** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
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**
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** Original Code. The Original Code is: OpenGL Sample Implementation,
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** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
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** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
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** Copyright in any portions created by third parties is as indicated
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** elsewhere herein. All Rights Reserved.
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**
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** Additional Notice Provisions: The application programming interfaces
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** established by SGI in conjunction with the Original Code are The
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** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
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** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
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** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
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** Window System(R) (Version 1.3), released October 19, 1998. This software
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** was created using the OpenGL(R) version 1.2.1 Sample Implementation
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** published by SGI, but has not been independently verified as being
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** compliant with the OpenGL(R) version 1.2.1 Specification.
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**
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*/
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/*
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** An implementation of a buffer which is part of the front buffer
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*/
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#include "glxserver.h"
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#include "glxutil.h"
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#include "glxfb.h"
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#include <gcstruct.h>
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/* so we don't include glmath.h */
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extern GLuint __glFloorLog2(GLuint);
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typedef struct __GLFBbufferInfoRec {
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GCPtr pGC;
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} __GLFBbufferInfo;
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extern PixmapPtr __glXPrivPixGetPtr(__GLdrawableBuffer *);
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/* ---------------------------------------------------------- */
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static GLboolean
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Resize(__GLdrawableBuffer *buf,
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GLint x, GLint y, GLuint width, GLuint height,
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__GLdrawablePrivate *glPriv, GLuint bufferMask)
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{
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buf->width = width;
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buf->height = height;
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buf->byteWidth = width * buf->elementSize;
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buf->outerWidth = width;
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return GL_TRUE;
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}
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static void
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Lock(__GLdrawableBuffer *buf, __GLdrawablePrivate *glPriv)
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{
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}
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static void
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Unlock(__GLdrawableBuffer *buf, __GLdrawablePrivate *glPriv)
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{
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}
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/*
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** Do a swap buffer with
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** a memory surface as a back buffer
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** a FB surface as a front buffer
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*/
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GLboolean
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__glXFBMemSwapBuffers(__GLXdrawablePrivate *glxPriv)
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{
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__GLdrawablePrivate *glPriv = &glxPriv->glPriv;
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__GLdrawableBuffer *front = &glPriv->frontBuffer;
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__GLdrawableBuffer *back = &glPriv->backBuffer;
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__GLFBbufferInfo *bufferInfo;
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GCPtr pGC;
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GLint width, height, depth, pad;
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GLubyte *buf;
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bufferInfo = (__GLFBbufferInfo *) front->other;
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pGC = bufferInfo->pGC;
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width = back->width;
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height = back->height;
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depth = back->depth;
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buf = back->base;
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pad = back->outerWidth - back->width; /* back buffer padding */
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/* adjust buffer padding. X wants left, GL has right */
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buf -= pad;
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ValidateGC(glxPriv->pDraw, pGC);
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(*pGC->ops->PutImage)(glxPriv->pDraw, pGC,
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depth,
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0, 0, width, height,
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pad, ZPixmap,
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(char *)buf);
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return GL_TRUE;
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}
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static void
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Free(__GLdrawableBuffer *buf, __GLdrawablePrivate *glPriv)
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{
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__GLFBbufferInfo *bufferInfo;
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bufferInfo = (__GLFBbufferInfo *) buf->other;
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if (bufferInfo->pGC) {
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FreeScratchGC(bufferInfo->pGC);
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}
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__glXFree(bufferInfo);
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buf->other = NULL;
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}
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/*
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** function to return the X GC of this buffer (to be used by DDX)
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*/
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GCPtr __glXFBGetGC(__GLdrawableBuffer *buf)
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{
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__GLFBbufferInfo *bufferInfo;
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bufferInfo = (__GLFBbufferInfo *) buf->other;
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if (bufferInfo) {
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return bufferInfo->pGC;
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} else {
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return NULL;
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}
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}
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void
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__glXInitFB(__GLdrawableBuffer *buf, __GLdrawablePrivate *glPriv, GLint bits)
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{
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__GLFBbufferInfo *bufferInfo;
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__GLXdrawablePrivate *glxPriv = (__GLXdrawablePrivate *) glPriv->other;
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GCPtr pGC;
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buf->depth = bits;
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buf->width = buf->height = 0; /* to be filled during Update */
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buf->handle = buf->base = NULL; /* to be filled during Update */
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buf->size = 0;
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buf->byteWidth = 0;
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buf->elementSize = ((bits-1) / 8) + 1;
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buf->elementSizeLog2 = __glFloorLog2(buf->elementSize);
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buf->resize = Resize;
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buf->lock = Lock;
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buf->unlock = Unlock;
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buf->fill = NULL;
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buf->free = Free;
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/* allocate local information */
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bufferInfo = (__GLFBbufferInfo *) __glXMalloc(sizeof(__GLFBbufferInfo));
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buf->other = (void *) bufferInfo;
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pGC = CreateScratchGC(glxPriv->pDraw->pScreen,
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glxPriv->pDraw->depth);
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bufferInfo->pGC = pGC;
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(*pGC->funcs->ChangeClip)(pGC, CT_NONE, NULL, 0);
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}
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