src/mesa/drivers/svga/svgamesa24.c

   1 /* $Id: svgamesa24.c,v 1.12 2002/11/11 18:42:41 brianp Exp $ */
   2
   3 /*
   4  * Mesa 3-D graphics library
   5  * Version:  5.0
   6  * Copyright (C) 1995-2002  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 #include "swrast/swrast.h"
  39
  40
  41 #if 0
  42 /* this doesn't compile with GCC on RedHat 6.1 */
  43 static inline int RGB2BGR24(int c)
  44 {
  45         asm("rorw  $8, %0\n"
  46             "rorl $16, %0\n"
  47             "rorw  $8, %0\n"
  48             "shrl  $8, %0\n"
  49       : "=q"(c):"0"(c));
  50     return c;
  51 }
  52 #else
  53 static unsigned long RGB2BGR24(unsigned long color)
  54 {
  55    return (color & 0xff00)|(color>>16)|((color & 0xff)<<16);
  56 }
  57 #endif
  58
  59 static void __svga_drawpixel24(int x, int y, GLubyte r, GLubyte g, GLubyte b)
  60 {
  61     unsigned long offset;
  62
  63     _RGB *rgbBuffer=(void *)SVGABuffer.DrawBuffer;
  64     y = SVGAInfo->height-y-1;
  65     offset = y * SVGAInfo->width + x;
  66
  67     rgbBuffer[offset].r=r;
  68     rgbBuffer[offset].g=g;
  69     rgbBuffer[offset].b=b;
  70 }
  71
  72 static unsigned long __svga_getpixel24(int x, int y)
  73 {
  74     unsigned long offset;
  75
  76     _RGB *rgbBuffer=(void *)SVGABuffer.ReadBuffer;
  77     y = SVGAInfo->height-y-1;
  78     offset = y * SVGAInfo->width + x;
  79     return rgbBuffer[offset].r<<16 | rgbBuffer[offset].g<<8 | rgbBuffer[offset].b;
  80 }
  81
  82 void __clear_color24( GLcontext *ctx, const GLfloat color[4] )
  83 {
  84    GLubyte col[3];
  85    CLAMPED_FLOAT_TO_UBYTE(col[0], color[0]);
  86    CLAMPED_FLOAT_TO_UBYTE(col[1], color[1]);
  87    CLAMPED_FLOAT_TO_UBYTE(col[2], color[2]);
  88    SVGAMesa->clear_red = col[0];
  89    SVGAMesa->clear_green = col[1];
  90    SVGAMesa->clear_blue = col[2];
  91 /*   SVGAMesa->clear_truecolor = red<<16 | green<<8 | blue; */
  92 }
  93
  94 void __clear24( 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          _RGB *rgbBuffer=(void *)SVGABuffer.FrontBuffer;
 102          for (i=0;i<SVGABuffer.BufferSize / 3;i++) {
 103             rgbBuffer[i].r=SVGAMesa->clear_red;
 104             rgbBuffer[i].g=SVGAMesa->clear_green;
 105             rgbBuffer[i].b=SVGAMesa->clear_blue;
 106          }
 107       }
 108       else {
 109          GLubyte *tmp = SVGABuffer.DrawBuffer;
 110          SVGABuffer.DrawBuffer = SVGABuffer.FrontBuffer;
 111          for (i=x;i<width;i++)
 112             for (j=y;j<height;j++)
 113                __svga_drawpixel24( i, j, SVGAMesa->clear_red,
 114                                    SVGAMesa->clear_green,
 115                                    SVGAMesa->clear_blue);
 116          SVGABuffer.DrawBuffer = tmp;
 117       }
 118       mask &= ~DD_FRONT_LEFT_BIT;
 119    }
 120    if (mask & DD_BACK_LEFT_BIT) {
 121       if (all) {
 122          _RGB *rgbBuffer=(void *)SVGABuffer.BackBuffer;
 123          for (i=0;i<SVGABuffer.BufferSize / 3;i++) {
 124             rgbBuffer[i].r=SVGAMesa->clear_red;
 125             rgbBuffer[i].g=SVGAMesa->clear_green;
 126             rgbBuffer[i].b=SVGAMesa->clear_blue;
 127          }
 128       }
 129       else {
 130          GLubyte *tmp = SVGABuffer.DrawBuffer;
 131          SVGABuffer.DrawBuffer = SVGABuffer.BackBuffer;
 132          for (i=x;i<width;i++)
 133             for (j=y;j<height;j++)
 134                __svga_drawpixel24( i, j, SVGAMesa->clear_red,
 135                                    SVGAMesa->clear_green,
 136                                    SVGAMesa->clear_blue);
 137          SVGABuffer.DrawBuffer = tmp;
 138       }
 139       mask &= ~DD_BACK_LEFT_BIT;
 140    }
 141
 142    if (mask)
 143       _swrast_Clear( ctx, mask, all, x, y, width, height );
 144 }
 145
 146 void __write_rgba_span24( const GLcontext *ctx, GLuint n, GLint x, GLint y,
 147                           const GLubyte rgba[][4], const GLubyte mask[] )
 148 {
 149    int i;
 150    if (mask) {
 151       /* draw some pixels */
 152       for (i=0; i<n; i++, x++) {
 153          if (mask[i]) {
 154          __svga_drawpixel24( x, y, rgba[i][RCOMP],
 155                                    rgba[i][GCOMP],
 156                                    rgba[i][BCOMP]);
 157          }
 158       }
 159    }
 160    else {
 161       /* draw all pixels */
 162       for (i=0; i<n; i++, x++) {
 163          __svga_drawpixel24( x, y, rgba[i][RCOMP],
 164                                    rgba[i][GCOMP],
 165                                    rgba[i][BCOMP]);
 166       }
 167    }
 168 }
 169
 170 void __write_mono_rgba_span24( const GLcontext *ctx,
 171                                GLuint n, GLint x, GLint y,
 172                                const GLchan color[4], const GLubyte mask[])
 173 {
 174    int i;
 175    for (i=0; i<n; i++, x++) {
 176       if (mask[i]) {
 177          __svga_drawpixel24( x, y, color[RCOMP], color[GCOMP], color[BCOMP]);
 178       }
 179    }
 180 }
 181
 182 void __read_rgba_span24( const GLcontext *ctx, GLuint n, GLint x, GLint y,
 183                          GLubyte rgba[][4] )
 184 {
 185    int i;
 186    for (i=0; i<n; i++, x++) {
 187     *((GLint*)rgba[i]) = RGB2BGR24(__svga_getpixel24( x, y));
 188    }
 189 }
 190
 191 void __write_rgba_pixels24( const GLcontext *ctx,
 192                             GLuint n, const GLint x[], const GLint y[],
 193                             const GLubyte rgba[][4], const GLubyte mask[] )
 194 {
 195    int i;
 196    for (i=0; i<n; i++) {
 197       if (mask[i]) {
 198          __svga_drawpixel24( x[i], y[i], rgba[i][RCOMP],
 199                                          rgba[i][GCOMP],
 200                                          rgba[i][BCOMP]);
 201       }
 202    }
 203 }
 204
 205 void __write_mono_rgba_pixels24( const GLcontext *ctx,
 206                                  GLuint n,
 207                                  const GLint x[], const GLint y[],
 208                                  const GLchan color[4], const GLubyte mask[] )
 209 {
 210    int i;
 211    for (i=0; i<n; i++) {
 212       if (mask[i]) {
 213          __svga_drawpixel24( x[i], y[i],
 214                              color[RCOMP], color[GCOMP], color[BCOMP] );
 215       }
 216    }
 217 }
 218
 219 void __read_rgba_pixels24( const GLcontext *ctx,
 220                            GLuint n, const GLint x[], const GLint y[],
 221                            GLubyte rgba[][4], const GLubyte mask[] )
 222 {
 223    int i;
 224    for (i=0; i<n; i++,x++) {
 225     *((GLint*)rgba[i]) = RGB2BGR24(__svga_getpixel24( x[i], y[i]));
 226    }
 227 }
 228
 229 #else
 230
 231
 232 /* silence compiler warning */
 233 extern void _mesa_svga24_dummy_function(void);
 234 void _mesa_svga24_dummy_function(void)
 235 {
 236 }
 237
 238
 239 #endif