src/mesa/drivers/svga/svgamesa24.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 "svgamesa24.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 RGB2BGR24(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 RGB2BGR24(unsigned long color)
  53 {
  54    return (color & 0xff00)|(color>>16)|((color & 0xff)<<16);
  55 }
  56 #endif
  57
  58 static void __svga_drawpixel24(int x, int y, GLubyte r, GLubyte g, GLubyte b)
  59 {
  60     unsigned long offset;
  61
  62     _RGB *rgbBuffer=(void *)SVGABuffer.DrawBuffer;
  63     y = SVGAInfo->height-y-1;
  64     offset = y * SVGAInfo->width + x;
  65
  66     rgbBuffer[offset].r=r;
  67     rgbBuffer[offset].g=g;
  68     rgbBuffer[offset].b=b;
  69 }
  70
  71 static unsigned long __svga_getpixel24(int x, int y)
  72 {
  73     unsigned long offset;
  74
  75     _RGB *rgbBuffer=(void *)SVGABuffer.ReadBuffer;
  76     y = SVGAInfo->height-y-1;
  77     offset = y * SVGAInfo->width + x;
  78     return rgbBuffer[offset].r<<16 | rgbBuffer[offset].g<<8 | rgbBuffer[offset].b;
  79 }
  80
  81 void __clear_color24( GLcontext *ctx, const GLfloat color[4] )
  82 {
  83    GLubyte col[3];
  84    CLAMPED_FLOAT_TO_UBYTE(col[0], color[0]);
  85    CLAMPED_FLOAT_TO_UBYTE(col[1], color[1]);
  86    CLAMPED_FLOAT_TO_UBYTE(col[2], color[2]);
  87    SVGAMesa->clear_red = col[0];
  88    SVGAMesa->clear_green = col[1];
  89    SVGAMesa->clear_blue = col[2];
  90 /*   SVGAMesa->clear_truecolor = red<<16 | green<<8 | blue; */
  91 }
  92
  93 void __clear24( GLcontext *ctx, GLbitfield mask )
  94 {
  95    int i,j;
  96    int x = ctx->DrawBuffer->_Xmin;
  97    int y = ctx->DrawBuffer->_Ymin;
  98    int width = ctx->DrawBuffer->_Xmax - x;
  99    int height = ctx->DrawBuffer->_Ymax - y;
 100    GLboolean all = (width == ctx->DrawBuffer->Width && height == ctx->DrawBuffer->height)
 101
 102    if (mask & DD_FRONT_LEFT_BIT) {
 103       if (all) {
 104          _RGB *rgbBuffer=(void *)SVGABuffer.FrontBuffer;
 105          for (i=0;i<SVGABuffer.BufferSize / 3;i++) {
 106             rgbBuffer[i].r=SVGAMesa->clear_red;
 107             rgbBuffer[i].g=SVGAMesa->clear_green;
 108             rgbBuffer[i].b=SVGAMesa->clear_blue;
 109          }
 110       }
 111       else {
 112          GLubyte *tmp = SVGABuffer.DrawBuffer;
 113          SVGABuffer.DrawBuffer = SVGABuffer.FrontBuffer;
 114          for (i=x;i<width;i++)
 115             for (j=y;j<height;j++)
 116                __svga_drawpixel24( i, j, SVGAMesa->clear_red,
 117                                    SVGAMesa->clear_green,
 118                                    SVGAMesa->clear_blue);
 119          SVGABuffer.DrawBuffer = tmp;
 120       }
 121       mask &= ~DD_FRONT_LEFT_BIT;
 122    }
 123    if (mask & DD_BACK_LEFT_BIT) {
 124       if (all) {
 125          _RGB *rgbBuffer=(void *)SVGABuffer.BackBuffer;
 126          for (i=0;i<SVGABuffer.BufferSize / 3;i++) {
 127             rgbBuffer[i].r=SVGAMesa->clear_red;
 128             rgbBuffer[i].g=SVGAMesa->clear_green;
 129             rgbBuffer[i].b=SVGAMesa->clear_blue;
 130          }
 131       }
 132       else {
 133          GLubyte *tmp = SVGABuffer.DrawBuffer;
 134          SVGABuffer.DrawBuffer = SVGABuffer.BackBuffer;
 135          for (i=x;i<width;i++)
 136             for (j=y;j<height;j++)
 137                __svga_drawpixel24( i, j, SVGAMesa->clear_red,
 138                                    SVGAMesa->clear_green,
 139                                    SVGAMesa->clear_blue);
 140          SVGABuffer.DrawBuffer = tmp;
 141       }
 142       mask &= ~DD_BACK_LEFT_BIT;
 143    }
 144
 145    if (mask)
 146       _swrast_Clear( ctx, mask );
 147 }
 148
 149 void __write_rgba_span24( const GLcontext *ctx, GLuint n, GLint x, GLint y,
 150                           const GLubyte rgba[][4], const GLubyte mask[] )
 151 {
 152    int i;
 153    if (mask) {
 154       /* draw some pixels */
 155       for (i=0; i<n; i++, x++) {
 156          if (mask[i]) {
 157          __svga_drawpixel24( x, y, rgba[i][RCOMP],
 158                                    rgba[i][GCOMP],
 159                                    rgba[i][BCOMP]);
 160          }
 161       }
 162    }
 163    else {
 164       /* draw all pixels */
 165       for (i=0; i<n; i++, x++) {
 166          __svga_drawpixel24( x, y, rgba[i][RCOMP],
 167                                    rgba[i][GCOMP],
 168                                    rgba[i][BCOMP]);
 169       }
 170    }
 171 }
 172
 173 void __write_mono_rgba_span24( const GLcontext *ctx,
 174                                GLuint n, GLint x, GLint y,
 175                                const GLchan color[4], const GLubyte mask[])
 176 {
 177    int i;
 178    for (i=0; i<n; i++, x++) {
 179       if (mask[i]) {
 180          __svga_drawpixel24( x, y, color[RCOMP], color[GCOMP], color[BCOMP]);
 181       }
 182    }
 183 }
 184
 185 void __read_rgba_span24( const GLcontext *ctx, GLuint n, GLint x, GLint y,
 186                          GLubyte rgba[][4] )
 187 {
 188    int i;
 189    for (i=0; i<n; i++, x++) {
 190     *((GLint*)rgba[i]) = RGB2BGR24(__svga_getpixel24( x, y));
 191    }
 192 }
 193
 194 void __write_rgba_pixels24( const GLcontext *ctx,
 195                             GLuint n, const GLint x[], const GLint y[],
 196                             const GLubyte rgba[][4], const GLubyte mask[] )
 197 {
 198    int i;
 199    for (i=0; i<n; i++) {
 200       if (mask[i]) {
 201          __svga_drawpixel24( x[i], y[i], rgba[i][RCOMP],
 202                                          rgba[i][GCOMP],
 203                                          rgba[i][BCOMP]);
 204       }
 205    }
 206 }
 207
 208 void __write_mono_rgba_pixels24( const GLcontext *ctx,
 209                                  GLuint n,
 210                                  const GLint x[], const GLint y[],
 211                                  const GLchan color[4], const GLubyte mask[] )
 212 {
 213    int i;
 214    for (i=0; i<n; i++) {
 215       if (mask[i]) {
 216          __svga_drawpixel24( x[i], y[i],
 217                              color[RCOMP], color[GCOMP], color[BCOMP] );
 218       }
 219    }
 220 }
 221
 222 void __read_rgba_pixels24( const GLcontext *ctx,
 223                            GLuint n, const GLint x[], const GLint y[],
 224                            GLubyte rgba[][4], const GLubyte mask[] )
 225 {
 226    int i;
 227    for (i=0; i<n; i++,x++) {
 228     *((GLint*)rgba[i]) = RGB2BGR24(__svga_getpixel24( x[i], y[i]));
 229    }
 230 }
 231
 232 #else
 233
 234
 235 /* silence compiler warning */
 236 extern void _mesa_svga24_dummy_function(void);
 237 void _mesa_svga24_dummy_function(void)
 238 {
 239 }
 240
 241
 242 #endif