src/mesa/drivers/svga/svgamesa32.c

   1 /* $Id: svgamesa32.c,v 1.6 2000/01/31 22:10:07 tanner 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 #include "svgapix.h"
  37 #include "svgamesa32.h"
  38
  39 #if 0
  40 /* this doesn't compile with GCC on RedHat 6.1 */
  41 static inline int RGB2BGR32(int c)
  42 {
  43         asm("rorw  $8, %0\n"
  44             "rorl $16, %0\n"
  45             "rorw  $8, %0\n"
  46             "shrl  $8, %0\n"
  47       : "=q"(c):"0"(c));
  48     return c;
  49 }
  50 #else
  51 static unsigned long RGB2BGR32(unsigned long color)
  52 {
  53    return (color & 0xff00)|(color>>16)|((color & 0xff)<<16);
  54 }
  55 #endif
  56
  57 static void __svga_drawpixel32(int x, int y, unsigned long c)
  58 {
  59     unsigned long offset;
  60
  61     GLint *intBuffer=(void *)SVGABuffer.DrawBuffer;
  62     y = SVGAInfo->height-y-1;
  63     offset = y * SVGAInfo->width + x;
  64     intBuffer[offset]=c;
  65 }
  66
  67 static unsigned long __svga_getpixel32(int x, int y)
  68 {
  69     unsigned long offset;
  70
  71     const GLint *intBuffer=(void *)SVGABuffer.ReadBuffer;
  72     y = SVGAInfo->height-y-1;
  73     offset = y * SVGAInfo->width + x;
  74     return intBuffer[offset];
  75 }
  76
  77 void __set_color32( GLcontext *ctx,
  78                     GLubyte red, GLubyte green,
  79                     GLubyte blue, GLubyte alpha )
  80 {
  81    SVGAMesa->red = red;
  82    SVGAMesa->green = green;
  83    SVGAMesa->blue = blue;
  84    SVGAMesa->truecolor = red<<16 | green<<8 | blue;
  85 }
  86
  87 void __clear_color32( GLcontext *ctx,
  88                       GLubyte red, GLubyte green,
  89                       GLubyte blue, GLubyte alpha )
  90 {
  91    SVGAMesa->clear_truecolor = red<<16 | green<<8 | blue;
  92 }
  93
  94 GLbitfield __clear32( GLcontext *ctx, GLbitfield mask, GLboolean all,
  95                         GLint x, GLint y, GLint width, GLint height )
  96 {
  97    int i,j;
  98
  99    if (mask & DD_FRONT_LEFT_BIT) {
 100       if (all) {
 101          GLint *intBuffer=(void *)SVGABuffer.FrontBuffer;
 102          for (i=0;i<SVGABuffer.BufferSize / 4;i++)
 103             intBuffer[i]=SVGAMesa->clear_truecolor;
 104       }
 105       else {
 106          GLubyte *tmp = SVGABuffer.DrawBuffer;
 107          SVGABuffer.DrawBuffer = SVGABuffer.FrontBuffer;
 108          for (i=x;i<width;i++)
 109             for (j=y;j<height;j++)
 110                __svga_drawpixel32(i,j,SVGAMesa->clear_truecolor);
 111          SVGABuffer.DrawBuffer = tmp;
 112       }
 113    }
 114    if (mask & DD_BACK_LEFT_BIT) {
 115       if (all) {
 116          GLint *intBuffer=(void *)SVGABuffer.BackBuffer;
 117          for (i=0;i<SVGABuffer.BufferSize / 4;i++)
 118             intBuffer[i]=SVGAMesa->clear_truecolor;
 119       }
 120       else {
 121          GLubyte *tmp = SVGABuffer.DrawBuffer;
 122          SVGABuffer.DrawBuffer = SVGABuffer.BackBuffer;
 123          for (i=x;i<width;i++)
 124             for (j=y;j<height;j++)
 125                __svga_drawpixel32(i,j,SVGAMesa->clear_truecolor);
 126          SVGABuffer.DrawBuffer = tmp;
 127       }
 128    }
 129    return mask & (~(DD_FRONT_LEFT_BIT | DD_BACK_LEFT_BIT));
 130 }
 131
 132 void __write_rgba_span32( const GLcontext *ctx, GLuint n, GLint x, GLint y,
 133                           const GLubyte rgba[][4], const GLubyte mask[] )
 134 {
 135    int i;
 136    if (mask) {
 137       /* draw some pixels */
 138       for (i=0; i<n; i++, x++) {
 139          if (mask[i]) {
 140          __svga_drawpixel32( x, y, RGB2BGR32(*((GLint*)rgba[i])));
 141          }
 142       }
 143    }
 144    else {
 145       /* draw all pixels */
 146       for (i=0; i<n; i++, x++) {
 147          __svga_drawpixel32( x, y, RGB2BGR32(*((GLint*)rgba[i])));
 148       }
 149    }
 150 }
 151
 152 void __write_mono_rgba_span32( const GLcontext *ctx,
 153                                GLuint n, GLint x, GLint y,
 154                                const GLubyte mask[])
 155 {
 156    int i;
 157    for (i=0; i<n; i++, x++) {
 158       if (mask[i]) {
 159          __svga_drawpixel32( x, y, SVGAMesa->truecolor);
 160       }
 161    }
 162 }
 163
 164 void __read_rgba_span32( const GLcontext *ctx, GLuint n, GLint x, GLint y,
 165                          GLubyte rgba[][4] )
 166 {
 167    int i;
 168    for (i=0; i<n; i++, x++) {
 169      *((GLint*)rgba[i]) = RGB2BGR32(__svga_getpixel32( x, y ));
 170    }
 171 }
 172
 173 void __write_rgba_pixels32( const GLcontext *ctx,
 174                             GLuint n, const GLint x[], const GLint y[],
 175                             const GLubyte rgba[][4], const GLubyte mask[] )
 176 {
 177    int i;
 178    for (i=0; i<n; i++) {
 179       if (mask[i]) {
 180          __svga_drawpixel32( x[i], y[i], RGB2BGR32(*((GLint*)rgba[i])));
 181       }
 182    }
 183 }
 184
 185 void __write_mono_rgba_pixels32( const GLcontext *ctx,
 186                                  GLuint n,
 187                                  const GLint x[], const GLint y[],
 188                                  const GLubyte mask[] )
 189 {
 190    int i;
 191    /* use current rgb color */
 192    for (i=0; i<n; i++) {
 193       if (mask[i]) {
 194          __svga_drawpixel32( x[i], y[i], SVGAMesa->truecolor );
 195       }
 196    }
 197 }
 198
 199 void __read_rgba_pixels32( const GLcontext *ctx,
 200                            GLuint n, const GLint x[], const GLint y[],
 201                            GLubyte rgba[][4], const GLubyte mask[] )
 202 {
 203    int i;
 204    for (i=0; i<n; i++,x++) {
 205     *((GLint*)rgba[i]) = RGB2BGR32(__svga_getpixel32( x[i], y[i] ));
 206    }
 207 }
 208
 209 #endif
 210