src/mesa/drivers/svga/svgamesa32.c

   1 /* $Id: svgamesa32.c,v 1.12.36.1 2006/11/02 12:02:17 alanh 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 )
  89 {
  90    int i,j;
  91    int x = ctx->DrawBuffer->_Xmin;
  92    int y = ctx->DrawBuffer->_Ymin;
  93    int width = ctx->DrawBuffer->_Xmax - x;
  94    int height = ctx->DrawBuffer->_Ymax - y;
  95    GLboolean all = (width == ctx->DrawBuffer->Width && height == ctx->DrawBuffer->height)
  96
  97    if (mask & DD_FRONT_LEFT_BIT) {
  98       if (all) {
  99          GLint *intBuffer=(void *)SVGABuffer.FrontBuffer;
 100          for (i=0;i<SVGABuffer.BufferSize / 4;i++)
 101             intBuffer[i]=SVGAMesa->clear_truecolor;
 102       }
 103       else {
 104          GLubyte *tmp = SVGABuffer.DrawBuffer;
 105          SVGABuffer.DrawBuffer = SVGABuffer.FrontBuffer;
 106          for (i=x;i<width;i++)
 107             for (j=y;j<height;j++)
 108                __svga_drawpixel32(i,j,SVGAMesa->clear_truecolor);
 109          SVGABuffer.DrawBuffer = tmp;
 110       }
 111       mask &= ~DD_FRONT_LEFT_BIT;
 112    }
 113    if (mask & DD_BACK_LEFT_BIT) {
 114       if (all) {
 115          GLint *intBuffer=(void *)SVGABuffer.BackBuffer;
 116          for (i=0;i<SVGABuffer.BufferSize / 4;i++)
 117             intBuffer[i]=SVGAMesa->clear_truecolor;
 118       }
 119       else {
 120          GLubyte *tmp = SVGABuffer.DrawBuffer;
 121          SVGABuffer.DrawBuffer = SVGABuffer.BackBuffer;
 122          for (i=x;i<width;i++)
 123             for (j=y;j<height;j++)
 124                __svga_drawpixel32(i,j,SVGAMesa->clear_truecolor);
 125          SVGABuffer.DrawBuffer = tmp;
 126       }
 127       mask &= ~DD_BACK_LEFT_BIT;
 128    }
 129
 130    if (mask)
 131       _swrast_Clear( ctx, mask );
 132 }
 133
 134 void __write_rgba_span32( const GLcontext *ctx, GLuint n, GLint x, GLint y,
 135                           const GLubyte rgba[][4], const GLubyte mask[] )
 136 {
 137    int i;
 138    if (mask) {
 139       /* draw some pixels */
 140       for (i=0; i<n; i++, x++) {
 141          if (mask[i]) {
 142          __svga_drawpixel32( x, y, RGB2BGR32(*((GLint*)rgba[i])));
 143          }
 144       }
 145    }
 146    else {
 147       /* draw all pixels */
 148       for (i=0; i<n; i++, x++) {
 149          __svga_drawpixel32( x, y, RGB2BGR32(*((GLint*)rgba[i])));
 150       }
 151    }
 152 }
 153
 154 void __write_mono_rgba_span32( const GLcontext *ctx,
 155                                GLuint n, GLint x, GLint y,
 156                                const GLchan color[4], const GLubyte mask[])
 157 {
 158    int i;
 159    GLuint truecolor = color[RCOMP]<<16 | color[GCOMP]<<8 | color[BCOMP];
 160    for (i=0; i<n; i++, x++) {
 161       if (mask[i]) {
 162          __svga_drawpixel32( x, y, truecolor);
 163       }
 164    }
 165 }
 166
 167 void __read_rgba_span32( const GLcontext *ctx, GLuint n, GLint x, GLint y,
 168                          GLubyte rgba[][4] )
 169 {
 170    int i;
 171    for (i=0; i<n; i++, x++) {
 172      *((GLint*)rgba[i]) = RGB2BGR32(__svga_getpixel32( x, y ));
 173    }
 174 }
 175
 176 void __write_rgba_pixels32( const GLcontext *ctx,
 177                             GLuint n, const GLint x[], const GLint y[],
 178                             const GLubyte rgba[][4], const GLubyte mask[] )
 179 {
 180    int i;
 181    for (i=0; i<n; i++) {
 182       if (mask[i]) {
 183          __svga_drawpixel32( x[i], y[i], RGB2BGR32(*((GLint*)rgba[i])));
 184       }
 185    }
 186 }
 187
 188 void __write_mono_rgba_pixels32( const GLcontext *ctx,
 189                                  GLuint n,
 190                                  const GLint x[], const GLint y[],
 191                                  const GLchan color[4], const GLubyte mask[] )
 192 {
 193    GLuint truecolor = color[RCOMP]<<16 | color[GCOMP]<<8 | color[BCOMP];
 194    int i;
 195    for (i=0; i<n; i++) {
 196       if (mask[i]) {
 197          __svga_drawpixel32( x[i], y[i], truecolor );
 198       }
 199    }
 200 }
 201
 202 void __read_rgba_pixels32( const GLcontext *ctx,
 203                            GLuint n, const GLint x[], const GLint y[],
 204                            GLubyte rgba[][4], const GLubyte mask[] )
 205 {
 206    int i;
 207    for (i=0; i<n; i++,x++) {
 208     *((GLint*)rgba[i]) = RGB2BGR32(__svga_getpixel32( x[i], y[i] ));
 209    }
 210 }
 211
 212
 213 #else
 214
 215
 216 /* silence compiler warning */
 217 extern void _mesa_svga32_dummy_function(void);
 218 void _mesa_svga32_dummy_function(void)
 219 {
 220 }
 221
 222
 223 #endif
 224