src/mesa/drivers/svga/svgamesa32.c

   1
   2 /*
   3  * Mesa 3-D graphics library
   4  * Version:  5.0
   5  * Copyright (C) 1995-2002  Brian Paul
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Library General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Library General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Library General Public
  18  * License along with this library; if not, write to the Free
  19  * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20  */
  21
  22
  23 /*
  24  * SVGA driver for Mesa.
  25  * Original author:  Brian Paul
  26  * Additional authors:  Slawomir Szczyrba <steev@hot.pl>  (Mesa 3.2)
  27  */
  28
  29 #ifdef HAVE_CONFIG_H
  30 #include "conf.h"
  31 #endif
  32
  33 #ifdef SVGA
  34
  35 #include "svgapix.h"
  36 #include "svgamesa32.h"
  37 #include "swrast/swrast.h"
  38
  39
  40 #if 0
  41 /* this doesn't compile with GCC on RedHat 6.1 */
  42 static INLINE int RGB2BGR32(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 RGB2BGR32(unsigned long color)
  53 {
  54    return (color & 0xff00)|(color>>16)|((color & 0xff)<<16);
  55 }
  56 #endif
  57
  58 static void __svga_drawpixel32(int x, int y, unsigned long c)
  59 {
  60     unsigned long offset;
  61
  62     GLint *intBuffer=(void *)SVGABuffer.DrawBuffer;
  63     y = SVGAInfo->height-y-1;
  64     offset = y * SVGAInfo->width + x;
  65     intBuffer[offset]=c;
  66 }
  67
  68 static unsigned long __svga_getpixel32(int x, int y)
  69 {
  70     unsigned long offset;
  71
  72     const GLint *intBuffer=(void *)SVGABuffer.ReadBuffer;
  73     y = SVGAInfo->height-y-1;
  74     offset = y * SVGAInfo->width + x;
  75     return intBuffer[offset];
  76 }
  77
  78 void __clear_color32( GLcontext *ctx, const GLfloat color[4] )
  79 {
  80    GLubyte col[3];
  81    CLAMPED_FLOAT_TO_UBYTE(col[0], color[0]);
  82    CLAMPED_FLOAT_TO_UBYTE(col[1], color[1]);
  83    CLAMPED_FLOAT_TO_UBYTE(col[2], color[2]);
  84    SVGAMesa->clear_truecolor = (col[0] << 16) | (col[1] << 8) | col[2];
  85 }
  86
  87 void __clear32( GLcontext *ctx, GLbitfield mask )
  88 {
  89    int i,j;
  90    int x = ctx->DrawBuffer->_Xmin;
  91    int y = ctx->DrawBuffer->_Ymin;
  92    int width = ctx->DrawBuffer->_Xmax - x;
  93    int height = ctx->DrawBuffer->_Ymax - y;
  94    GLboolean all = (width == ctx->DrawBuffer->Width && height == ctx->DrawBuffer->height)
  95
  96    if (mask & DD_FRONT_LEFT_BIT) {
  97       if (all) {
  98          GLint *intBuffer=(void *)SVGABuffer.FrontBuffer;
  99          for (i=0;i<SVGABuffer.BufferSize / 4;i++)
 100             intBuffer[i]=SVGAMesa->clear_truecolor;
 101       }
 102       else {
 103          GLubyte *tmp = SVGABuffer.DrawBuffer;
 104          SVGABuffer.DrawBuffer = SVGABuffer.FrontBuffer;
 105          for (i=x;i<width;i++)
 106             for (j=y;j<height;j++)
 107                __svga_drawpixel32(i,j,SVGAMesa->clear_truecolor);
 108          SVGABuffer.DrawBuffer = tmp;
 109       }
 110       mask &= ~DD_FRONT_LEFT_BIT;
 111    }
 112    if (mask & DD_BACK_LEFT_BIT) {
 113       if (all) {
 114          GLint *intBuffer=(void *)SVGABuffer.BackBuffer;
 115          for (i=0;i<SVGABuffer.BufferSize / 4;i++)
 116             intBuffer[i]=SVGAMesa->clear_truecolor;
 117       }
 118       else {
 119          GLubyte *tmp = SVGABuffer.DrawBuffer;
 120          SVGABuffer.DrawBuffer = SVGABuffer.BackBuffer;
 121          for (i=x;i<width;i++)
 122             for (j=y;j<height;j++)
 123                __svga_drawpixel32(i,j,SVGAMesa->clear_truecolor);
 124          SVGABuffer.DrawBuffer = tmp;
 125       }
 126       mask &= ~DD_BACK_LEFT_BIT;
 127    }
 128
 129    if (mask)
 130       _swrast_Clear( ctx, mask );
 131 }
 132
 133 void __write_rgba_span32( const GLcontext *ctx, GLuint n, GLint x, GLint y,
 134                           const GLubyte rgba[][4], const GLubyte mask[] )
 135 {
 136    int i;
 137    if (mask) {
 138       /* draw some pixels */
 139       for (i=0; i<n; i++, x++) {
 140          if (mask[i]) {
 141          __svga_drawpixel32( x, y, RGB2BGR32(*((GLint*)rgba[i])));
 142          }
 143       }
 144    }
 145    else {
 146       /* draw all pixels */
 147       for (i=0; i<n; i++, x++) {
 148          __svga_drawpixel32( x, y, RGB2BGR32(*((GLint*)rgba[i])));
 149       }
 150    }
 151 }
 152
 153 void __write_mono_rgba_span32( const GLcontext *ctx,
 154                                GLuint n, GLint x, GLint y,
 155                                const GLchan color[4], const GLubyte mask[])
 156 {
 157    int i;
 158    GLuint truecolor = color[RCOMP]<<16 | color[GCOMP]<<8 | color[BCOMP];
 159    for (i=0; i<n; i++, x++) {
 160       if (mask[i]) {
 161          __svga_drawpixel32( x, y, truecolor);
 162       }
 163    }
 164 }
 165
 166 void __read_rgba_span32( const GLcontext *ctx, GLuint n, GLint x, GLint y,
 167                          GLubyte rgba[][4] )
 168 {
 169    int i;
 170    for (i=0; i<n; i++, x++) {
 171      *((GLint*)rgba[i]) = RGB2BGR32(__svga_getpixel32( x, y ));
 172    }
 173 }
 174
 175 void __write_rgba_pixels32( const GLcontext *ctx,
 176                             GLuint n, const GLint x[], const GLint y[],
 177                             const GLubyte rgba[][4], const GLubyte mask[] )
 178 {
 179    int i;
 180    for (i=0; i<n; i++) {
 181       if (mask[i]) {
 182          __svga_drawpixel32( x[i], y[i], RGB2BGR32(*((GLint*)rgba[i])));
 183       }
 184    }
 185 }
 186
 187 void __write_mono_rgba_pixels32( const GLcontext *ctx,
 188                                  GLuint n,
 189                                  const GLint x[], const GLint y[],
 190                                  const GLchan color[4], const GLubyte mask[] )
 191 {
 192    GLuint truecolor = color[RCOMP]<<16 | color[GCOMP]<<8 | color[BCOMP];
 193    int i;
 194    for (i=0; i<n; i++) {
 195       if (mask[i]) {
 196          __svga_drawpixel32( x[i], y[i], truecolor );
 197       }
 198    }
 199 }
 200
 201 void __read_rgba_pixels32( const GLcontext *ctx,
 202                            GLuint n, const GLint x[], const GLint y[],
 203                            GLubyte rgba[][4], const GLubyte mask[] )
 204 {
 205    int i;
 206    for (i=0; i<n; i++,x++) {
 207     *((GLint*)rgba[i]) = RGB2BGR32(__svga_getpixel32( x[i], y[i] ));
 208    }
 209 }
 210
 211
 212 #else
 213
 214
 215 /* silence compiler warning */
 216 extern void _mesa_svga32_dummy_function(void);
 217 void _mesa_svga32_dummy_function(void)
 218 {
 219 }
 220
 221
 222 #endif
 223