src/mesa/drivers/svga/svgamesa24.c

   1 /* $Id: svgamesa24.c,v 1.13 2006/11/01 19:35:23 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 )
  95 {
  96    int i,j;
  97    int x = ctx->DrawBuffer->_Xmin;
  98    int y = ctx->DrawBuffer->_Ymin;
  99    int width = ctx->DrawBuffer->_Xmax - x;
 100    int height = ctx->DrawBuffer->_Ymax - y;
 101    GLboolean all = (width == ctx->DrawBuffer->Width && height == ctx->DrawBuffer->height)
 102
 103    if (mask & DD_FRONT_LEFT_BIT) {
 104       if (all) {
 105          _RGB *rgbBuffer=(void *)SVGABuffer.FrontBuffer;
 106          for (i=0;i<SVGABuffer.BufferSize / 3;i++) {
 107             rgbBuffer[i].r=SVGAMesa->clear_red;
 108             rgbBuffer[i].g=SVGAMesa->clear_green;
 109             rgbBuffer[i].b=SVGAMesa->clear_blue;
 110          }
 111       }
 112       else {
 113          GLubyte *tmp = SVGABuffer.DrawBuffer;
 114          SVGABuffer.DrawBuffer = SVGABuffer.FrontBuffer;
 115          for (i=x;i<width;i++)
 116             for (j=y;j<height;j++)
 117                __svga_drawpixel24( i, j, SVGAMesa->clear_red,
 118                                    SVGAMesa->clear_green,
 119                                    SVGAMesa->clear_blue);
 120          SVGABuffer.DrawBuffer = tmp;
 121       }
 122       mask &= ~DD_FRONT_LEFT_BIT;
 123    }
 124    if (mask & DD_BACK_LEFT_BIT) {
 125       if (all) {
 126          _RGB *rgbBuffer=(void *)SVGABuffer.BackBuffer;
 127          for (i=0;i<SVGABuffer.BufferSize / 3;i++) {
 128             rgbBuffer[i].r=SVGAMesa->clear_red;
 129             rgbBuffer[i].g=SVGAMesa->clear_green;
 130             rgbBuffer[i].b=SVGAMesa->clear_blue;
 131          }
 132       }
 133       else {
 134          GLubyte *tmp = SVGABuffer.DrawBuffer;
 135          SVGABuffer.DrawBuffer = SVGABuffer.BackBuffer;
 136          for (i=x;i<width;i++)
 137             for (j=y;j<height;j++)
 138                __svga_drawpixel24( i, j, SVGAMesa->clear_red,
 139                                    SVGAMesa->clear_green,
 140                                    SVGAMesa->clear_blue);
 141          SVGABuffer.DrawBuffer = tmp;
 142       }
 143       mask &= ~DD_BACK_LEFT_BIT;
 144    }
 145
 146    if (mask)
 147       _swrast_Clear( ctx, mask );
 148 }
 149
 150 void __write_rgba_span24( const GLcontext *ctx, GLuint n, GLint x, GLint y,
 151                           const GLubyte rgba[][4], const GLubyte mask[] )
 152 {
 153    int i;
 154    if (mask) {
 155       /* draw some pixels */
 156       for (i=0; i<n; i++, x++) {
 157          if (mask[i]) {
 158          __svga_drawpixel24( x, y, rgba[i][RCOMP],
 159                                    rgba[i][GCOMP],
 160                                    rgba[i][BCOMP]);
 161          }
 162       }
 163    }
 164    else {
 165       /* draw all pixels */
 166       for (i=0; i<n; i++, x++) {
 167          __svga_drawpixel24( x, y, rgba[i][RCOMP],
 168                                    rgba[i][GCOMP],
 169                                    rgba[i][BCOMP]);
 170       }
 171    }
 172 }
 173
 174 void __write_mono_rgba_span24( const GLcontext *ctx,
 175                                GLuint n, GLint x, GLint y,
 176                                const GLchan color[4], const GLubyte mask[])
 177 {
 178    int i;
 179    for (i=0; i<n; i++, x++) {
 180       if (mask[i]) {
 181          __svga_drawpixel24( x, y, color[RCOMP], color[GCOMP], color[BCOMP]);
 182       }
 183    }
 184 }
 185
 186 void __read_rgba_span24( const GLcontext *ctx, GLuint n, GLint x, GLint y,
 187                          GLubyte rgba[][4] )
 188 {
 189    int i;
 190    for (i=0; i<n; i++, x++) {
 191     *((GLint*)rgba[i]) = RGB2BGR24(__svga_getpixel24( x, y));
 192    }
 193 }
 194
 195 void __write_rgba_pixels24( const GLcontext *ctx,
 196                             GLuint n, const GLint x[], const GLint y[],
 197                             const GLubyte rgba[][4], const GLubyte mask[] )
 198 {
 199    int i;
 200    for (i=0; i<n; i++) {
 201       if (mask[i]) {
 202          __svga_drawpixel24( x[i], y[i], rgba[i][RCOMP],
 203                                          rgba[i][GCOMP],
 204                                          rgba[i][BCOMP]);
 205       }
 206    }
 207 }
 208
 209 void __write_mono_rgba_pixels24( const GLcontext *ctx,
 210                                  GLuint n,
 211                                  const GLint x[], const GLint y[],
 212                                  const GLchan color[4], const GLubyte mask[] )
 213 {
 214    int i;
 215    for (i=0; i<n; i++) {
 216       if (mask[i]) {
 217          __svga_drawpixel24( x[i], y[i],
 218                              color[RCOMP], color[GCOMP], color[BCOMP] );
 219       }
 220    }
 221 }
 222
 223 void __read_rgba_pixels24( const GLcontext *ctx,
 224                            GLuint n, const GLint x[], const GLint y[],
 225                            GLubyte rgba[][4], const GLubyte mask[] )
 226 {
 227    int i;
 228    for (i=0; i<n; i++,x++) {
 229     *((GLint*)rgba[i]) = RGB2BGR24(__svga_getpixel24( x[i], y[i]));
 230    }
 231 }
 232
 233 #else
 234
 235
 236 /* silence compiler warning */
 237 extern void _mesa_svga24_dummy_function(void);
 238 void _mesa_svga24_dummy_function(void)
 239 {
 240 }
 241
 242
 243 #endif