src/mesa/drivers/svga/svgamesa8.c

   1 /* $Id: svgamesa8.c,v 1.7 2000/11/14 17:40:14 brianp Exp $ */
   2
   3 /*
   4  * Mesa 3-D graphics library
   5  * Version:  3.3
   6  * Copyright (C) 1995-2000  Brian Paul
   7  *
   8  * This library is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Library General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2 of the License, or (at your option) any later version.
  12  *
  13  * This library is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Library General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Library General Public
  19  * License along with this library; if not, write to the Free
  20  * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21  */
  22
  23
  24 /*
  25  * SVGA driver for Mesa.
  26  * Original author:  Brian Paul
  27  * Additional authors:  Slawomir Szczyrba <steev@hot.pl>  (Mesa 3.2)
  28  */
  29
  30 #ifdef HAVE_CONFIG_H
  31 #include "conf.h"
  32 #endif
  33
  34 #ifdef SVGA
  35
  36
  37 #include "svgapix.h"
  38 #include "svgamesa8.h"
  39
  40 static void __svga_drawpixel8(int x, int y, unsigned long c)
  41 {
  42     unsigned long offset;
  43     y = SVGAInfo->height-y-1;
  44     offset = y * SVGAInfo->linewidth + x;
  45     SVGABuffer.DrawBuffer[offset]=c;
  46 }
  47
  48 static unsigned long __svga_getpixel8(int x, int y)
  49 {
  50     unsigned long offset;
  51     y = SVGAInfo->height-y-1;
  52     offset = y * SVGAInfo->linewidth + x;
  53     return SVGABuffer.ReadBuffer[offset];
  54 }
  55
  56 void __clear_index8( GLcontext *ctx, GLuint index )
  57 {
  58    SVGAMesa->clear_index = index;
  59 }
  60
  61 GLbitfield __clear8( GLcontext *ctx, GLbitfield mask, GLboolean all,
  62                      GLint x, GLint y, GLint width, GLint height )
  63 {
  64    int i,j;
  65
  66    if (mask & DD_FRONT_LEFT_BIT) {
  67       if (all) {
  68          memset(SVGABuffer.FrontBuffer, SVGAMesa->clear_index, SVGABuffer.BufferSize);
  69       }
  70       else {
  71          GLubyte *tmp = SVGABuffer.DrawBuffer;
  72          SVGABuffer.DrawBuffer = SVGABuffer.FrontBuffer;
  73          for (i=x;i<width;i++)
  74             for (j=y;j<height;j++)
  75                __svga_drawpixel8(i,j,SVGAMesa->clear_index);
  76          SVGABuffer.DrawBuffer = tmp;
  77       }
  78    }
  79    if (mask & DD_BACK_LEFT_BIT) {
  80       if (all) {
  81          memset(SVGABuffer.BackBuffer, SVGAMesa->clear_index, SVGABuffer.BufferSize);
  82       }
  83       else {
  84          GLubyte *tmp = SVGABuffer.DrawBuffer;
  85          SVGABuffer.DrawBuffer = SVGABuffer.BackBuffer;
  86          for (i=x;i<width;i++)
  87             for (j=y;j<height;j++)
  88                __svga_drawpixel8(i,j,SVGAMesa->clear_index);
  89          SVGABuffer.DrawBuffer = tmp;
  90       }
  91    }
  92    return mask & (~(DD_FRONT_LEFT_BIT | DD_BACK_LEFT_BIT));
  93 }
  94
  95 void __write_ci32_span8( const GLcontext *ctx, GLuint n, GLint x, GLint y,
  96                          const GLuint index[], const GLubyte mask[] )
  97 {
  98    int i;
  99    for (i=0;i<n;i++,x++) {
 100       if (mask[i]) {
 101          __svga_drawpixel8( x, y, index[i]);
 102       }
 103    }
 104 }
 105
 106 void __write_ci8_span8( const GLcontext *ctx, GLuint n, GLint x, GLint y,
 107                         const GLubyte index[], const GLubyte mask[] )
 108 {
 109    int i;
 110
 111    for (i=0;i<n;i++,x++) {
 112       if (mask[i]) {
 113          __svga_drawpixel8( x, y, index[i]);
 114       }
 115    }
 116 }
 117
 118 void __write_mono_ci_span8( const GLcontext *ctx, GLuint n,
 119                             GLint x, GLint y,
 120                             GLuint colorIndex, const GLubyte mask[] )
 121 {
 122    int i;
 123    for (i=0;i<n;i++,x++) {
 124       if (mask[i]) {
 125          __svga_drawpixel8( x, y, colorIndex);
 126       }
 127    }
 128 }
 129
 130 void __read_ci32_span8( const GLcontext *ctx,
 131                         GLuint n, GLint x, GLint y, GLuint index[])
 132 {
 133    int i;
 134    for (i=0; i<n; i++,x++) {
 135       index[i] = __svga_getpixel8( x, y);
 136    }
 137 }
 138
 139 void __write_ci32_pixels8( const GLcontext *ctx,
 140                            GLuint n, const GLint x[], const GLint y[],
 141                            const GLuint index[], const GLubyte mask[] )
 142 {
 143    int i;
 144    for (i=0; i<n; i++) {
 145       if (mask[i]) {
 146          __svga_drawpixel8( x[i], y[i], index[i]);
 147       }
 148    }
 149 }
 150
 151
 152 void __write_mono_ci_pixels8( const GLcontext *ctx, GLuint n,
 153                               const GLint x[], const GLint y[],
 154                               GLuint colorIndex, const GLubyte mask[] )
 155 {
 156    int i;
 157    for (i=0; i<n; i++) {
 158       if (mask[i]) {
 159          __svga_drawpixel8( x[i], y[i], colorIndex);
 160       }
 161    }
 162 }
 163
 164 void __read_ci32_pixels8( const GLcontext *ctx,
 165                           GLuint n, const GLint x[], const GLint y[],
 166                           GLuint index[], const GLubyte mask[] )
 167 {
 168    int i;
 169    for (i=0; i<n; i++,x++) {
 170       index[i] = __svga_getpixel8( x[i], y[i]);
 171    }
 172 }
 173
 174
 175 #else
 176
 177
 178 /* silence compiler warning */
 179 extern void _mesa_svga8_dummy_function(void);
 180 void _mesa_svga8_dummy_function(void)
 181 {
 182 }
 183
 184
 185 #endif