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+/* $XFree86: xc/programs/Xserver/GL/glx/glxmem.c,v 1.6 2001/10/31 22:50:27 tsi 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.
+**
+*/
+
+/*
+** Implementation of a buffer in main memory
+*/
+
+#ifdef HAVE_DIX_CONFIG_H
+#include <dix-config.h>
+#endif
+
+#include "glxserver.h"
+#include "glxmem.h"
+#include "glxext.h"
+#include "GL/internal/glcore.h"
+
+/* don't want to include glmath.h */
+extern GLuint __glFloorLog2(GLuint);
+
+/* ---------------------------------------------------------- */
+
+#define BUF_ALIGN 32 /* x86 cache alignment (used for assembly paths) */
+#define BUF_ALIGN_MASK (BUF_ALIGN-1)
+
+static GLboolean
+Resize(__GLdrawableBuffer *buf,
+ GLint x, GLint y, GLuint width, GLuint height,
+ __GLdrawablePrivate *glPriv, GLuint bufferMask)
+{
+ GLuint newSize;
+ void *ubase;
+ GLint pixelWidth;
+ GLint alignedWidth;
+
+ /*
+ ** Note:
+ ** buf->handle : unaligned base
+ ** buf->base : aligned base
+ */
+
+ pixelWidth = BUF_ALIGN / buf->elementSize;
+ alignedWidth = (width & ~(pixelWidth-1)) + pixelWidth;
+
+ newSize = alignedWidth * height * buf->elementSize;
+
+ /*
+ ** Only allocate buffer space for the SGI core.
+ ** Mesa and Aqua handle their own buffer allocations.
+ */
+#if defined(__GL_BUFFER_SIZE_TRACKS_WINDOW)
+ if (__glXCoreType() == GL_CORE_SGI) {
+#else
+ if (newSize > buf->size && __glXCoreType() == GL_CORE_SGI) {
+#endif
+ if (buf->handle) {
+ ubase = (*glPriv->realloc)(buf->handle, newSize + BUF_ALIGN_MASK);
+ if (ubase == NULL) {
+ return GL_FALSE;
+ }
+ } else {
+ ubase = (*glPriv->malloc)(newSize + BUF_ALIGN_MASK);
+ if (ubase == NULL) {
+ return GL_FALSE;
+ }
+ }
+ buf->size = newSize;
+
+ buf->handle = ubase;
+ buf->base = (void *)(((size_t)ubase + BUF_ALIGN_MASK) &
+ (unsigned int) ~BUF_ALIGN_MASK);
+ assert(((size_t)buf->base % BUF_ALIGN) == 0);
+ }
+
+ buf->width = width;
+ buf->height = height;
+ buf->byteWidth = alignedWidth * buf->elementSize;
+ buf->outerWidth = alignedWidth;
+
+ return GL_TRUE;
+}
+
+static void
+Lock(__GLdrawableBuffer *buf, __GLdrawablePrivate *glPriv)
+{
+}
+
+static void
+Unlock(__GLdrawableBuffer *buf, __GLdrawablePrivate *glPriv)
+{
+}
+
+static void
+Free(__GLdrawableBuffer *buf, __GLdrawablePrivate *glPriv)
+{
+ if (buf->handle) {
+ (*glPriv->free)(buf->handle);
+ buf->handle = NULL;
+ }
+}
+
+
+void
+__glXInitMem(__GLdrawableBuffer *buf, __GLdrawablePrivate *glPriv, GLint bits)
+{
+ buf->width = buf->height = 0; /* to be filled during Update */
+ buf->depth = bits;
+ buf->size = 0;
+ buf->handle = buf->base = NULL; /* to be filled during Update */
+ 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;
+}