src/mesa/drivers/svga/svgamesa32.c

   1 /* $Id: svgamesa32.c,v 1.8 2000/11/14 17:40:14 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 "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 __clear_color32( GLcontext *ctx,
  78                       GLubyte red, GLubyte green,
  79                       GLubyte blue, GLubyte alpha )
  80 {
  81    SVGAMesa->clear_truecolor = red<<16 | green<<8 | blue;
  82 }
  83
  84 GLbitfield __clear32( GLcontext *ctx, GLbitfield mask, GLboolean all,
  85                         GLint x, GLint y, GLint width, GLint height )
  86 {
  87    int i,j;
  88
  89    if (mask & DD_FRONT_LEFT_BIT) {
  90       if (all) {
  91          GLint *intBuffer=(void *)SVGABuffer.FrontBuffer;
  92          for (i=0;i<SVGABuffer.BufferSize / 4;i++)
  93             intBuffer[i]=SVGAMesa->clear_truecolor;
  94       }
  95       else {
  96          GLubyte *tmp = SVGABuffer.DrawBuffer;
  97          SVGABuffer.DrawBuffer = SVGABuffer.FrontBuffer;
  98          for (i=x;i<width;i++)
  99             for (j=y;j<height;j++)
 100                __svga_drawpixel32(i,j,SVGAMesa->clear_truecolor);
 101          SVGABuffer.DrawBuffer = tmp;
 102       }
 103    }
 104    if (mask & DD_BACK_LEFT_BIT) {
 105       if (all) {
 106          GLint *intBuffer=(void *)SVGABuffer.BackBuffer;
 107          for (i=0;i<SVGABuffer.BufferSize / 4;i++)
 108             intBuffer[i]=SVGAMesa->clear_truecolor;
 109       }
 110       else {
 111          GLubyte *tmp = SVGABuffer.DrawBuffer;
 112          SVGABuffer.DrawBuffer = SVGABuffer.BackBuffer;
 113          for (i=x;i<width;i++)
 114             for (j=y;j<height;j++)
 115                __svga_drawpixel32(i,j,SVGAMesa->clear_truecolor);
 116          SVGABuffer.DrawBuffer = tmp;
 117       }
 118    }
 119    return mask & (~(DD_FRONT_LEFT_BIT | DD_BACK_LEFT_BIT));
 120 }
 121
 122 void __write_rgba_span32( const GLcontext *ctx, GLuint n, GLint x, GLint y,
 123                           const GLubyte rgba[][4], const GLubyte mask[] )
 124 {
 125    int i;
 126    if (mask) {
 127       /* draw some pixels */
 128       for (i=0; i<n; i++, x++) {
 129          if (mask[i]) {
 130          __svga_drawpixel32( x, y, RGB2BGR32(*((GLint*)rgba[i])));
 131          }
 132       }
 133    }
 134    else {
 135       /* draw all pixels */
 136       for (i=0; i<n; i++, x++) {
 137          __svga_drawpixel32( x, y, RGB2BGR32(*((GLint*)rgba[i])));
 138       }
 139    }
 140 }
 141
 142 void __write_mono_rgba_span32( const GLcontext *ctx,
 143                                GLuint n, GLint x, GLint y,
 144                                const GLchan color[4], const GLubyte mask[])
 145 {
 146    int i;
 147    GLuint truecolor = color[RCOMP]<<16 | color[GCOMP]<<8 | color[BCOMP];
 148    for (i=0; i<n; i++, x++) {
 149       if (mask[i]) {
 150          __svga_drawpixel32( x, y, truecolor);
 151       }
 152    }
 153 }
 154
 155 void __read_rgba_span32( const GLcontext *ctx, GLuint n, GLint x, GLint y,
 156                          GLubyte rgba[][4] )
 157 {
 158    int i;
 159    for (i=0; i<n; i++, x++) {
 160      *((GLint*)rgba[i]) = RGB2BGR32(__svga_getpixel32( x, y ));
 161    }
 162 }
 163
 164 void __write_rgba_pixels32( const GLcontext *ctx,
 165                             GLuint n, const GLint x[], const GLint y[],
 166                             const GLubyte rgba[][4], const GLubyte mask[] )
 167 {
 168    int i;
 169    for (i=0; i<n; i++) {
 170       if (mask[i]) {
 171          __svga_drawpixel32( x[i], y[i], RGB2BGR32(*((GLint*)rgba[i])));
 172       }
 173    }
 174 }
 175
 176 void __write_mono_rgba_pixels32( const GLcontext *ctx,
 177                                  GLuint n,
 178                                  const GLint x[], const GLint y[],
 179                                  const GLchan color[4], const GLubyte mask[] )
 180 {
 181    GLuint truecolor = color[RCOMP]<<16 | color[GCOMP]<<8 | color[BCOMP];
 182    int i;
 183    for (i=0; i<n; i++) {
 184       if (mask[i]) {
 185          __svga_drawpixel32( x[i], y[i], truecolor );
 186       }
 187    }
 188 }
 189
 190 void __read_rgba_pixels32( const GLcontext *ctx,
 191                            GLuint n, const GLint x[], const GLint y[],
 192                            GLubyte rgba[][4], const GLubyte mask[] )
 193 {
 194    int i;
 195    for (i=0; i<n; i++,x++) {
 196     *((GLint*)rgba[i]) = RGB2BGR32(__svga_getpixel32( x[i], y[i] ));
 197    }
 198 }
 199
 200
 201 #else
 202
 203
 204 /* silence compiler warning */
 205 extern void _mesa_svga32_dummy_function(void);
 206 void _mesa_svga32_dummy_function(void)
 207 {
 208 }
 209
 210
 211 #endif
 212