148 lines
4.5 KiB
C
148 lines
4.5 KiB
C
/* $XFree86: xc/programs/Xserver/GL/glx/glxmem.c,v 1.7 2002/08/28 06:41:26 torrey 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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** Implementation of a buffer in main memory
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*/
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#include "glxserver.h"
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#include "glxmem.h"
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#include "glxext.h"
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#include "GL/internal/glcore.h"
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/* don't want to include glmath.h */
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extern GLuint __glFloorLog2(GLuint);
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/* ---------------------------------------------------------- */
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#define BUF_ALIGN 32 /* x86 cache alignment (used for assembly paths) */
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#define BUF_ALIGN_MASK (BUF_ALIGN-1)
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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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GLuint newSize;
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void *ubase;
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GLint pixelWidth;
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GLint alignedWidth;
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/*
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** Note:
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** buf->handle : unaligned base
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** buf->base : aligned base
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*/
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pixelWidth = BUF_ALIGN / buf->elementSize;
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alignedWidth = (width & ~(pixelWidth-1)) + pixelWidth;
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newSize = alignedWidth * height * buf->elementSize;
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/*
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** Only allocate buffer space for the SGI core.
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** Mesa and Aqua handle their own buffer allocations.
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*/
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#if defined(__GL_BUFFER_SIZE_TRACKS_WINDOW)
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if (__glXCoreType() == GL_CORE_SGI) {
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#else
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if (newSize > buf->size && __glXCoreType() == GL_CORE_SGI) {
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#endif
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if (buf->handle) {
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ubase = (*glPriv->realloc)(buf->handle, newSize + BUF_ALIGN_MASK);
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if (ubase == NULL) {
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return GL_FALSE;
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}
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} else {
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ubase = (*glPriv->malloc)(newSize + BUF_ALIGN_MASK);
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if (ubase == NULL) {
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return GL_FALSE;
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}
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}
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buf->size = newSize;
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buf->handle = ubase;
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buf->base = (void *)(((size_t)ubase + BUF_ALIGN_MASK) &
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(unsigned int) ~BUF_ALIGN_MASK);
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assert(((size_t)buf->base % BUF_ALIGN) == 0);
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}
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buf->width = width;
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buf->height = height;
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buf->byteWidth = alignedWidth * buf->elementSize;
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buf->outerWidth = alignedWidth;
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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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static void
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Free(__GLdrawableBuffer *buf, __GLdrawablePrivate *glPriv)
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{
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if (buf->handle) {
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(*glPriv->free)(buf->handle);
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buf->handle = NULL;
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}
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}
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void
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__glXInitMem(__GLdrawableBuffer *buf, __GLdrawablePrivate *glPriv, GLint bits)
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{
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buf->width = buf->height = 0; /* to be filled during Update */
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buf->depth = bits;
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buf->size = 0;
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buf->handle = buf->base = NULL; /* to be filled during Update */
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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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}
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