src/mesa/drivers/svga/svgamesa8.c

   1 /* $Id: svgamesa8.c,v 1.8 2001/02/06 00:03:48 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 #include "swrast/swrast.h"
  40
  41
  42 static void __svga_drawpixel8(int x, int y, unsigned long c)
  43 {
  44     unsigned long offset;
  45     y = SVGAInfo->height-y-1;
  46     offset = y * SVGAInfo->linewidth + x;
  47     SVGABuffer.DrawBuffer[offset]=c;
  48 }
  49
  50 static unsigned long __svga_getpixel8(int x, int y)
  51 {
  52     unsigned long offset;
  53     y = SVGAInfo->height-y-1;
  54     offset = y * SVGAInfo->linewidth + x;
  55     return SVGABuffer.ReadBuffer[offset];
  56 }
  57
  58 void __clear_index8( GLcontext *ctx, GLuint index )
  59 {
  60    SVGAMesa->clear_index = index;
  61 }
  62
  63 void __clear8( GLcontext *ctx, GLbitfield mask, GLboolean all,
  64                GLint x, GLint y, GLint width, GLint height )
  65 {
  66    int i,j;
  67
  68    if (mask & DD_FRONT_LEFT_BIT) {
  69       if (all) {
  70          memset(SVGABuffer.FrontBuffer, SVGAMesa->clear_index, SVGABuffer.BufferSize);
  71       }
  72       else {
  73          GLubyte *tmp = SVGABuffer.DrawBuffer;
  74          SVGABuffer.DrawBuffer = SVGABuffer.FrontBuffer;
  75          for (i=x;i<width;i++)
  76             for (j=y;j<height;j++)
  77                __svga_drawpixel8(i,j,SVGAMesa->clear_index);
  78          SVGABuffer.DrawBuffer = tmp;
  79       }
  80       mask &= ~DD_FRONT_LEFT_BIT;
  81    }
  82    if (mask & DD_BACK_LEFT_BIT) {
  83       if (all) {
  84          memset(SVGABuffer.BackBuffer, SVGAMesa->clear_index, SVGABuffer.BufferSize);
  85       }
  86       else {
  87          GLubyte *tmp = SVGABuffer.DrawBuffer;
  88          SVGABuffer.DrawBuffer = SVGABuffer.BackBuffer;
  89          for (i=x;i<width;i++)
  90             for (j=y;j<height;j++)
  91                __svga_drawpixel8(i,j,SVGAMesa->clear_index);
  92          SVGABuffer.DrawBuffer = tmp;
  93       }
  94       mask &= ~DD_BACK_LEFT_BIT;
  95    }
  96
  97    if (mask)
  98       _swrast_Clear( ctx, mask, all, x, y, width, height );
  99 }
 100
 101 void __write_ci32_span8( const GLcontext *ctx, GLuint n, GLint x, GLint y,
 102                          const GLuint index[], const GLubyte mask[] )
 103 {
 104    int i;
 105    for (i=0;i<n;i++,x++) {
 106       if (mask[i]) {
 107          __svga_drawpixel8( x, y, index[i]);
 108       }
 109    }
 110 }
 111
 112 void __write_ci8_span8( const GLcontext *ctx, GLuint n, GLint x, GLint y,
 113                         const GLubyte index[], const GLubyte mask[] )
 114 {
 115    int i;
 116
 117    for (i=0;i<n;i++,x++) {
 118       if (mask[i]) {
 119          __svga_drawpixel8( x, y, index[i]);
 120       }
 121    }
 122 }
 123
 124 void __write_mono_ci_span8( const GLcontext *ctx, GLuint n,
 125                             GLint x, GLint y,
 126                             GLuint colorIndex, const GLubyte mask[] )
 127 {
 128    int i;
 129    for (i=0;i<n;i++,x++) {
 130       if (mask[i]) {
 131          __svga_drawpixel8( x, y, colorIndex);
 132       }
 133    }
 134 }
 135
 136 void __read_ci32_span8( const GLcontext *ctx,
 137                         GLuint n, GLint x, GLint y, GLuint index[])
 138 {
 139    int i;
 140    for (i=0; i<n; i++,x++) {
 141       index[i] = __svga_getpixel8( x, y);
 142    }
 143 }
 144
 145 void __write_ci32_pixels8( const GLcontext *ctx,
 146                            GLuint n, const GLint x[], const GLint y[],
 147                            const GLuint index[], const GLubyte mask[] )
 148 {
 149    int i;
 150    for (i=0; i<n; i++) {
 151       if (mask[i]) {
 152          __svga_drawpixel8( x[i], y[i], index[i]);
 153       }
 154    }
 155 }
 156
 157
 158 void __write_mono_ci_pixels8( const GLcontext *ctx, GLuint n,
 159                               const GLint x[], const GLint y[],
 160                               GLuint colorIndex, const GLubyte mask[] )
 161 {
 162    int i;
 163    for (i=0; i<n; i++) {
 164       if (mask[i]) {
 165          __svga_drawpixel8( x[i], y[i], colorIndex);
 166       }
 167    }
 168 }
 169
 170 void __read_ci32_pixels8( const GLcontext *ctx,
 171                           GLuint n, const GLint x[], const GLint y[],
 172                           GLuint index[], const GLubyte mask[] )
 173 {
 174    int i;
 175    for (i=0; i<n; i++,x++) {
 176       index[i] = __svga_getpixel8( x[i], y[i]);
 177    }
 178 }
 179
 180
 181 #else
 182
 183
 184 /* silence compiler warning */
 185 extern void _mesa_svga8_dummy_function(void);
 186 void _mesa_svga8_dummy_function(void)
 187 {
 188 }
 189
 190
 191 #endif