src/mesa/drivers/svga/svgamesa8.c

   1 /* $Id: svgamesa8.c,v 1.6 2000/06/14 21:59:07 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 __set_index8( GLcontext *ctx, GLuint index )
  57 {
  58    SVGAMesa->index = index;
  59 }
  60
  61 void __clear_index8( GLcontext *ctx, GLuint index )
  62 {
  63    SVGAMesa->clear_index = index;
  64 }
  65
  66 GLbitfield __clear8( GLcontext *ctx, GLbitfield mask, GLboolean all,
  67                      GLint x, GLint y, GLint width, GLint height )
  68 {
  69    int i,j;
  70
  71    if (mask & DD_FRONT_LEFT_BIT) {
  72       if (all) {
  73          memset(SVGABuffer.FrontBuffer, SVGAMesa->clear_index, SVGABuffer.BufferSize);
  74       }
  75       else {
  76          GLubyte *tmp = SVGABuffer.DrawBuffer;
  77          SVGABuffer.DrawBuffer = SVGABuffer.FrontBuffer;
  78          for (i=x;i<width;i++)
  79             for (j=y;j<height;j++)
  80                __svga_drawpixel8(i,j,SVGAMesa->clear_index);
  81          SVGABuffer.DrawBuffer = tmp;
  82       }
  83    }
  84    if (mask & DD_BACK_LEFT_BIT) {
  85       if (all) {
  86          memset(SVGABuffer.BackBuffer, SVGAMesa->clear_index, SVGABuffer.BufferSize);
  87       }
  88       else {
  89          GLubyte *tmp = SVGABuffer.DrawBuffer;
  90          SVGABuffer.DrawBuffer = SVGABuffer.BackBuffer;
  91          for (i=x;i<width;i++)
  92             for (j=y;j<height;j++)
  93                __svga_drawpixel8(i,j,SVGAMesa->clear_index);
  94          SVGABuffer.DrawBuffer = tmp;
  95       }
  96    }
  97    return mask & (~(DD_FRONT_LEFT_BIT | DD_BACK_LEFT_BIT));
  98 }
  99
 100 void __write_ci32_span8( const GLcontext *ctx, GLuint n, GLint x, GLint y,
 101                          const GLuint index[], const GLubyte mask[] )
 102 {
 103    int i;
 104    for (i=0;i<n;i++,x++) {
 105       if (mask[i]) {
 106          __svga_drawpixel8( x, y, index[i]);
 107       }
 108    }
 109 }
 110
 111 void __write_ci8_span8( const GLcontext *ctx, GLuint n, GLint x, GLint y,
 112                         const GLubyte index[], const GLubyte mask[] )
 113 {
 114    int i;
 115
 116    for (i=0;i<n;i++,x++) {
 117       if (mask[i]) {
 118          __svga_drawpixel8( x, y, index[i]);
 119       }
 120    }
 121 }
 122
 123 void __write_mono_ci_span8( const GLcontext *ctx, GLuint n,
 124                             GLint x, GLint y, const GLubyte mask[] )
 125 {
 126    int i;
 127    for (i=0;i<n;i++,x++) {
 128       if (mask[i]) {
 129          __svga_drawpixel8( x, y, SVGAMesa->index);
 130       }
 131    }
 132 }
 133
 134 void __read_ci32_span8( const GLcontext *ctx,
 135                         GLuint n, GLint x, GLint y, GLuint index[])
 136 {
 137    int i;
 138    for (i=0; i<n; i++,x++) {
 139       index[i] = __svga_getpixel8( x, y);
 140    }
 141 }
 142
 143 void __write_ci32_pixels8( const GLcontext *ctx,
 144                            GLuint n, const GLint x[], const GLint y[],
 145                            const GLuint index[], const GLubyte mask[] )
 146 {
 147    int i;
 148    for (i=0; i<n; i++) {
 149       if (mask[i]) {
 150          __svga_drawpixel8( x[i], y[i], index[i]);
 151       }
 152    }
 153 }
 154
 155
 156 void __write_mono_ci_pixels8( const GLcontext *ctx, GLuint n,
 157                               const GLint x[], const GLint y[],
 158                               const GLubyte mask[] )
 159 {
 160    int i;
 161    for (i=0; i<n; i++) {
 162       if (mask[i]) {
 163          __svga_drawpixel8( x[i], y[i], SVGAMesa->index);
 164       }
 165    }
 166 }
 167
 168 void __read_ci32_pixels8( const GLcontext *ctx,
 169                           GLuint n, const GLint x[], const GLint y[],
 170                           GLuint index[], const GLubyte mask[] )
 171 {
 172    int i;
 173    for (i=0; i<n; i++,x++) {
 174       index[i] = __svga_getpixel8( x[i], y[i]);
 175    }
 176 }
 177
 178
 179 #else
 180
 181
 182 /* silence compiler warning */
 183 extern void _mesa_svga8_dummy_function(void);
 184 void _mesa_svga8_dummy_function(void)
 185 {
 186 }
 187
 188
 189 #endif