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Diffstat (limited to 'GL/glx/glxmem.c')
| -rw-r--r-- | GL/glx/glxmem.c | 147 |
1 files changed, 147 insertions, 0 deletions
diff --git a/GL/glx/glxmem.c b/GL/glx/glxmem.c new file mode 100644 index 000000000..0c3ea25a7 --- /dev/null +++ b/GL/glx/glxmem.c @@ -0,0 +1,147 @@ +/* $XFree86: xc/programs/Xserver/GL/glx/glxmem.c,v 1.7 2002/08/28 06:41:26 torrey 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 +*/ + +#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; +} |