src/mesa/drivers/svga/svgamesa32.c

   1 /* $Id: svgamesa32.c,v 1.12 2002/11/11 18:42:42 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 "svgamesa32.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 RGB2BGR32(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 RGB2BGR32(unsigned long color)
  54 {
  55    return (color & 0xff00)|(color>>16)|((color & 0xff)<<16);
  56 }
  57 #endif
  58
  59 static void __svga_drawpixel32(int x, int y, unsigned long c)
  60 {
  61     unsigned long offset;
  62
  63     GLint *intBuffer=(void *)SVGABuffer.DrawBuffer;
  64     y = SVGAInfo->height-y-1;
  65     offset = y * SVGAInfo->width + x;
  66     intBuffer[offset]=c;
  67 }
  68
  69 static unsigned long __svga_getpixel32(int x, int y)
  70 {
  71     unsigned long offset;
  72
  73     const GLint *intBuffer=(void *)SVGABuffer.ReadBuffer;
  74     y = SVGAInfo->height-y-1;
  75     offset = y * SVGAInfo->width + x;
  76     return intBuffer[offset];
  77 }
  78
  79 void __clear_color32( GLcontext *ctx, const GLfloat color[4] )
  80 {
  81    GLubyte col[3];
  82    CLAMPED_FLOAT_TO_UBYTE(col[0], color[0]);
  83    CLAMPED_FLOAT_TO_UBYTE(col[1], color[1]);
  84    CLAMPED_FLOAT_TO_UBYTE(col[2], color[2]);
  85    SVGAMesa->clear_truecolor = (col[0] << 16) | (col[1] << 8) | col[2];
  86 }
  87
  88 void __clear32( GLcontext *ctx, GLbitfield mask, GLboolean all,
  89                 GLint x, GLint y, GLint width, GLint height )
  90 {
  91    int i,j;
  92
  93    if (mask & DD_FRONT_LEFT_BIT) {
  94       if (all) {
  95          GLint *intBuffer=(void *)SVGABuffer.FrontBuffer;
  96          for (i=0;i<SVGABuffer.BufferSize / 4;i++)
  97             intBuffer[i]=SVGAMesa->clear_truecolor;
  98       }
  99       else {
 100          GLubyte *tmp = SVGABuffer.DrawBuffer;
 101          SVGABuffer.DrawBuffer = SVGABuffer.FrontBuffer;
 102          for (i=x;i<width;i++)
 103             for (j=y;j<height;j++)
 104                __svga_drawpixel32(i,j,SVGAMesa->clear_truecolor);
 105          SVGABuffer.DrawBuffer = tmp;
 106       }
 107       mask &= ~DD_FRONT_LEFT_BIT;
 108    }
 109    if (mask & DD_BACK_LEFT_BIT) {
 110       if (all) {
 111          GLint *intBuffer=(void *)SVGABuffer.BackBuffer;
 112          for (i=0;i<SVGABuffer.BufferSize / 4;i++)
 113             intBuffer[i]=SVGAMesa->clear_truecolor;
 114       }
 115       else {
 116          GLubyte *tmp = SVGABuffer.DrawBuffer;
 117          SVGABuffer.DrawBuffer = SVGABuffer.BackBuffer;
 118          for (i=x;i<width;i++)
 119             for (j=y;j<height;j++)
 120                __svga_drawpixel32(i,j,SVGAMesa->clear_truecolor);
 121          SVGABuffer.DrawBuffer = tmp;
 122       }
 123       mask &= ~DD_BACK_LEFT_BIT;
 124    }
 125
 126    if (mask)
 127       _swrast_Clear( ctx, mask, all, x, y, width, height );
 128 }
 129
 130 void __write_rgba_span32( const GLcontext *ctx, GLuint n, GLint x, GLint y,
 131                           const GLubyte rgba[][4], const GLubyte mask[] )
 132 {
 133    int i;
 134    if (mask) {
 135       /* draw some pixels */
 136       for (i=0; i<n; i++, x++) {
 137          if (mask[i]) {
 138          __svga_drawpixel32( x, y, RGB2BGR32(*((GLint*)rgba[i])));
 139          }
 140       }
 141    }
 142    else {
 143       /* draw all pixels */
 144       for (i=0; i<n; i++, x++) {
 145          __svga_drawpixel32( x, y, RGB2BGR32(*((GLint*)rgba[i])));
 146       }
 147    }
 148 }
 149
 150 void __write_mono_rgba_span32( const GLcontext *ctx,
 151                                GLuint n, GLint x, GLint y,
 152                                const GLchan color[4], const GLubyte mask[])
 153 {
 154    int i;
 155    GLuint truecolor = color[RCOMP]<<16 | color[GCOMP]<<8 | color[BCOMP];
 156    for (i=0; i<n; i++, x++) {
 157       if (mask[i]) {
 158          __svga_drawpixel32( x, y, truecolor);
 159       }
 160    }
 161 }
 162
 163 void __read_rgba_span32( const GLcontext *ctx, GLuint n, GLint x, GLint y,
 164                          GLubyte rgba[][4] )
 165 {
 166    int i;
 167    for (i=0; i<n; i++, x++) {
 168      *((GLint*)rgba[i]) = RGB2BGR32(__svga_getpixel32( x, y ));
 169    }
 170 }
 171
 172 void __write_rgba_pixels32( const GLcontext *ctx,
 173                             GLuint n, const GLint x[], const GLint y[],
 174                             const GLubyte rgba[][4], const GLubyte mask[] )
 175 {
 176    int i;
 177    for (i=0; i<n; i++) {
 178       if (mask[i]) {
 179          __svga_drawpixel32( x[i], y[i], RGB2BGR32(*((GLint*)rgba[i])));
 180       }
 181    }
 182 }
 183
 184 void __write_mono_rgba_pixels32( const GLcontext *ctx,
 185                                  GLuint n,
 186                                  const GLint x[], const GLint y[],
 187                                  const GLchan color[4], const GLubyte mask[] )
 188 {
 189    GLuint truecolor = color[RCOMP]<<16 | color[GCOMP]<<8 | color[BCOMP];
 190    int i;
 191    for (i=0; i<n; i++) {
 192       if (mask[i]) {
 193          __svga_drawpixel32( x[i], y[i], truecolor );
 194       }
 195    }
 196 }
 197
 198 void __read_rgba_pixels32( const GLcontext *ctx,
 199                            GLuint n, const GLint x[], const GLint y[],
 200                            GLubyte rgba[][4], const GLubyte mask[] )
 201 {
 202    int i;
 203    for (i=0; i<n; i++,x++) {
 204     *((GLint*)rgba[i]) = RGB2BGR32(__svga_getpixel32( x[i], y[i] ));
 205    }
 206 }
 207
 208
 209 #else
 210
 211
 212 /* silence compiler warning */
 213 extern void _mesa_svga32_dummy_function(void);
 214 void _mesa_svga32_dummy_function(void)
 215 {
 216 }
 217
 218
 219 #endif
 220