src/mesa/drivers/svga/svgamesa24.c

   1 /* $Id: svgamesa24.c,v 1.7 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 #include "svgapix.h"
  37 #include "svgamesa24.h"
  38
  39
  40 #if 0
  41 /* this doesn't compile with GCC on RedHat 6.1 */
  42 static inline int RGB2BGR24(int c)
  43 {
  44         asm("rorw  $8, %0\n"
  45             "rorl $16, %0\n"
  46             "rorw  $8, %0\n"
  47             "shrl  $8, %0\n"
  48       : "=q"(c):"0"(c));
  49     return c;
  50 }
  51 #else
  52 static unsigned long RGB2BGR24(unsigned long color)
  53 {
  54    return (color & 0xff00)|(color>>16)|((color & 0xff)<<16);
  55 }
  56 #endif
  57
  58 static void __svga_drawpixel24(int x, int y, GLubyte r, GLubyte g, GLubyte b)
  59 {
  60     unsigned long offset;
  61
  62     _RGB *rgbBuffer=(void *)SVGABuffer.DrawBuffer;
  63     y = SVGAInfo->height-y-1;
  64     offset = y * SVGAInfo->width + x;
  65
  66     rgbBuffer[offset].r=r;
  67     rgbBuffer[offset].g=g;
  68     rgbBuffer[offset].b=b;
  69 }
  70
  71 static unsigned long __svga_getpixel24(int x, int y)
  72 {
  73     unsigned long offset;
  74
  75     _RGB *rgbBuffer=(void *)SVGABuffer.ReadBuffer;
  76     y = SVGAInfo->height-y-1;
  77     offset = y * SVGAInfo->width + x;
  78     return rgbBuffer[offset].r<<16 | rgbBuffer[offset].g<<8 | rgbBuffer[offset].b;
  79 }
  80
  81 void __set_color24( GLcontext *ctx,
  82                     GLubyte red, GLubyte green,
  83                     GLubyte blue, GLubyte alpha )
  84 {
  85    SVGAMesa->red = red;
  86    SVGAMesa->green = green;
  87    SVGAMesa->blue = blue;
  88 /*   SVGAMesa->truecolor = red<<16 | green<<8 | blue; */
  89 }
  90
  91 void __clear_color24( GLcontext *ctx,
  92                       GLubyte red, GLubyte green,
  93                       GLubyte blue, GLubyte alpha )
  94 {
  95    SVGAMesa->clear_red = red;
  96    SVGAMesa->clear_green = green;
  97    SVGAMesa->clear_blue = blue;
  98 /*   SVGAMesa->clear_truecolor = red<<16 | green<<8 | blue; */
  99 }
 100
 101 GLbitfield __clear24( GLcontext *ctx, GLbitfield mask, GLboolean all,
 102                       GLint x, GLint y, GLint width, GLint height )
 103 {
 104    int i,j;
 105
 106    if (mask & DD_FRONT_LEFT_BIT) {
 107       if (all) {
 108          _RGB *rgbBuffer=(void *)SVGABuffer.FrontBuffer;
 109          for (i=0;i<SVGABuffer.BufferSize / 3;i++) {
 110             rgbBuffer[i].r=SVGAMesa->clear_red;
 111             rgbBuffer[i].g=SVGAMesa->clear_green;
 112             rgbBuffer[i].b=SVGAMesa->clear_blue;
 113          }
 114       }
 115       else {
 116          GLubyte *tmp = SVGABuffer.DrawBuffer;
 117          SVGABuffer.DrawBuffer = SVGABuffer.FrontBuffer;
 118          for (i=x;i<width;i++)
 119             for (j=y;j<height;j++)
 120                __svga_drawpixel24( i, j, SVGAMesa->clear_red,
 121                                    SVGAMesa->clear_green,
 122                                    SVGAMesa->clear_blue);
 123          SVGABuffer.DrawBuffer = tmp;
 124       }
 125    }
 126    if (mask & DD_BACK_LEFT_BIT) {
 127       if (all) {
 128          _RGB *rgbBuffer=(void *)SVGABuffer.BackBuffer;
 129          for (i=0;i<SVGABuffer.BufferSize / 3;i++) {
 130             rgbBuffer[i].r=SVGAMesa->clear_red;
 131             rgbBuffer[i].g=SVGAMesa->clear_green;
 132             rgbBuffer[i].b=SVGAMesa->clear_blue;
 133          }
 134       }
 135       else {
 136          GLubyte *tmp = SVGABuffer.DrawBuffer;
 137          SVGABuffer.DrawBuffer = SVGABuffer.BackBuffer;
 138          for (i=x;i<width;i++)
 139             for (j=y;j<height;j++)
 140                __svga_drawpixel24( i, j, SVGAMesa->clear_red,
 141                                    SVGAMesa->clear_green,
 142                                    SVGAMesa->clear_blue);
 143          SVGABuffer.DrawBuffer = tmp;
 144       }
 145    }
 146    return mask & (~(DD_FRONT_LEFT_BIT | DD_BACK_LEFT_BIT));
 147 }
 148
 149 void __write_rgba_span24( const GLcontext *ctx, GLuint n, GLint x, GLint y,
 150                           const GLubyte rgba[][4], const GLubyte mask[] )
 151 {
 152    int i;
 153    if (mask) {
 154       /* draw some pixels */
 155       for (i=0; i<n; i++, x++) {
 156          if (mask[i]) {
 157          __svga_drawpixel24( x, y, rgba[i][RCOMP],
 158                                    rgba[i][GCOMP],
 159                                    rgba[i][BCOMP]);
 160          }
 161       }
 162    }
 163    else {
 164       /* draw all pixels */
 165       for (i=0; i<n; i++, x++) {
 166          __svga_drawpixel24( x, y, rgba[i][RCOMP],
 167                                    rgba[i][GCOMP],
 168                                    rgba[i][BCOMP]);
 169       }
 170    }
 171 }
 172
 173 void __write_mono_rgba_span24( const GLcontext *ctx,
 174                                GLuint n, GLint x, GLint y,
 175                                const GLubyte mask[])
 176 {
 177    int i;
 178    for (i=0; i<n; i++, x++) {
 179       if (mask[i]) {
 180          __svga_drawpixel24( x, y, SVGAMesa->red,
 181                                    SVGAMesa->green,
 182                                    SVGAMesa->blue);
 183       }
 184    }
 185 }
 186
 187 void __read_rgba_span24( const GLcontext *ctx, GLuint n, GLint x, GLint y,
 188                          GLubyte rgba[][4] )
 189 {
 190    int i;
 191    for (i=0; i<n; i++, x++) {
 192     *((GLint*)rgba[i]) = RGB2BGR24(__svga_getpixel24( x, y));
 193    }
 194 }
 195
 196 void __write_rgba_pixels24( const GLcontext *ctx,
 197                             GLuint n, const GLint x[], const GLint y[],
 198                             const GLubyte rgba[][4], const GLubyte mask[] )
 199 {
 200    int i;
 201    for (i=0; i<n; i++) {
 202       if (mask[i]) {
 203          __svga_drawpixel24( x[i], y[i], rgba[i][RCOMP],
 204                                          rgba[i][GCOMP],
 205                                          rgba[i][BCOMP]);
 206       }
 207    }
 208 }
 209
 210 void __write_mono_rgba_pixels24( const GLcontext *ctx,
 211                                  GLuint n,
 212                                  const GLint x[], const GLint y[],
 213                                  const GLubyte mask[] )
 214 {
 215    int i;
 216    /* use current rgb color */
 217    for (i=0; i<n; i++) {
 218       if (mask[i]) {
 219          __svga_drawpixel24( x[i], y[i], SVGAMesa->red,
 220                                          SVGAMesa->green,
 221                                          SVGAMesa->blue);
 222       }
 223    }
 224 }
 225
 226 void __read_rgba_pixels24( const GLcontext *ctx,
 227                            GLuint n, const GLint x[], const GLint y[],
 228                            GLubyte rgba[][4], const GLubyte mask[] )
 229 {
 230    int i;
 231    for (i=0; i<n; i++,x++) {
 232     *((GLint*)rgba[i]) = RGB2BGR24(__svga_getpixel24( x[i], y[i]));
 233    }
 234 }
 235
 236 #else
 237
 238
 239 /* silence compiler warning */
 240 extern void _mesa_svga24_dummy_function(void);
 241 void _mesa_svga24_dummy_function(void)
 242 {
 243 }
 244
 245
 246 #endif