src/mesa/drivers/svga/svgamesa16.c

   1 /* $Id: svgamesa16.c,v 1.6 2000/06/14 21:59:07 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 "svgamesa16.h"
  38
  39
  40 static void __svga_drawpixel16(int x, int y, unsigned long c)
  41 {
  42     unsigned long offset;
  43     GLshort *shortBuffer=(void *)SVGABuffer.DrawBuffer;
  44     y = SVGAInfo->height-y-1;
  45     offset = y * SVGAInfo->width + x;
  46     shortBuffer[offset]=c;
  47 }
  48
  49 static unsigned long __svga_getpixel16(int x, int y)
  50 {
  51     unsigned long offset;
  52
  53     GLshort *shortBuffer=(void *)SVGABuffer.ReadBuffer;
  54     y = SVGAInfo->height-y-1;
  55     offset = y * SVGAInfo->width + x;
  56     return shortBuffer[offset];
  57 }
  58
  59 void __set_color16( GLcontext *ctx,
  60                     GLubyte red, GLubyte green,
  61                     GLubyte blue, GLubyte alpha )
  62 {
  63     SVGAMesa->hicolor=(red>>3)<<11 | (green>>2)<<5 | (blue>>3);
  64 /*    SVGAMesa->hicolor=(red)<<11 | (green)<<5 | (blue); */
  65 }
  66
  67 void __clear_color16( GLcontext *ctx,
  68                       GLubyte red, GLubyte green,
  69                       GLubyte blue, GLubyte alpha )
  70 {
  71     SVGAMesa->clear_hicolor=(red>>3)<<11 | (green>>2)<<5 | (blue>>3);
  72 /*    SVGAMesa->clear_hicolor=(red)<<11 | (green)<<5 | (blue); */
  73 }
  74
  75 GLbitfield __clear16( GLcontext *ctx, GLbitfield mask, GLboolean all,
  76                       GLint x, GLint y, GLint width, GLint height )
  77 {
  78    int i,j;
  79
  80    if (mask & DD_FRONT_LEFT_BIT) {
  81       if (all) {
  82          GLshort *shortBuffer=(void *)SVGABuffer.FrontBuffer;
  83          for (i=0;i<SVGABuffer.BufferSize / 2;i++)
  84             shortBuffer[i]=SVGAMesa->clear_hicolor;
  85       }
  86       else {
  87          GLubyte *tmp = SVGABuffer.DrawBuffer;
  88          SVGABuffer.DrawBuffer = SVGABuffer.FrontBuffer;
  89          for (i=x;i<width;i++)
  90             for (j=y;j<height;j++)
  91                __svga_drawpixel16(i,j,SVGAMesa->clear_hicolor);
  92          SVGABuffer.DrawBuffer = tmp;
  93       }
  94    }
  95    if (mask & DD_BACK_LEFT_BIT) {
  96       if (all) {
  97          GLshort *shortBuffer=(void *)SVGABuffer.BackBuffer;
  98          for (i=0;i<SVGABuffer.BufferSize / 2;i++)
  99             shortBuffer[i]=SVGAMesa->clear_hicolor;
 100       }
 101       else {
 102          GLubyte *tmp = SVGABuffer.DrawBuffer;
 103          SVGABuffer.DrawBuffer = SVGABuffer.BackBuffer;
 104          for (i=x;i<width;i++)
 105             for (j=y;j<height;j++)
 106                __svga_drawpixel16(i,j,SVGAMesa->clear_hicolor);
 107          SVGABuffer.DrawBuffer = tmp;
 108       }
 109    }
 110    return mask & (~(DD_FRONT_LEFT_BIT | DD_BACK_LEFT_BIT));
 111 }
 112
 113 void __write_rgba_span16( const GLcontext *ctx, GLuint n, GLint x, GLint y,
 114                           const GLubyte rgba[][4], const GLubyte mask[] )
 115 {
 116    int i;
 117    if (mask) {
 118       /* draw some pixels */
 119       for (i=0; i<n; i++, x++) {
 120          if (mask[i]) {
 121          __svga_drawpixel16( x, y, (rgba[i][RCOMP]>>3)<<11 | \
 122                                    (rgba[i][GCOMP]>>2)<<5  | \
 123                                    (rgba[i][BCOMP]>>3));
 124          }
 125       }
 126    }
 127    else {
 128       /* draw all pixels */
 129       for (i=0; i<n; i++, x++) {
 130          __svga_drawpixel16( x, y, (rgba[i][RCOMP]>>3)<<11 | \
 131                                    (rgba[i][GCOMP]>>2)<<5  | \
 132                                    (rgba[i][BCOMP]>>3));
 133       }
 134    }
 135 }
 136
 137 void __write_mono_rgba_span16( const GLcontext *ctx,
 138                                GLuint n, GLint x, GLint y,
 139                                const GLubyte mask[])
 140 {
 141    int i;
 142    for (i=0; i<n; i++, x++) {
 143       if (mask[i]) {
 144          __svga_drawpixel16( x, y, SVGAMesa->hicolor);
 145       }
 146    }
 147 }
 148
 149 void __read_rgba_span16( const GLcontext *ctx, GLuint n, GLint x, GLint y,
 150                          GLubyte rgba[][4] )
 151 {
 152    int i,pix;
 153    for (i=0; i<n; i++, x++) {
 154     pix = __svga_getpixel16( x, y );
 155     rgba[i][RCOMP] = ((pix>>11)<<3) & 0xff;
 156     rgba[i][GCOMP] = ((pix>> 5)<<2) & 0xff;
 157     rgba[i][BCOMP] = ((pix    )<<3) & 0xff;
 158    }
 159 }
 160
 161 void __write_rgba_pixels16( const GLcontext *ctx,
 162                             GLuint n, const GLint x[], const GLint y[],
 163                             const GLubyte rgba[][4], const GLubyte mask[] )
 164 {
 165    int i;
 166    for (i=0; i<n; i++) {
 167       if (mask[i]) {
 168          __svga_drawpixel16( x[i], y[i], (rgba[i][RCOMP]>>3)<<11 | \
 169                                          (rgba[i][GCOMP]>>2)<<5  | \
 170                                          (rgba[i][BCOMP]>>3));
 171       }
 172    }
 173 }
 174
 175
 176 void __write_mono_rgba_pixels16( const GLcontext *ctx,
 177                                  GLuint n,
 178                                  const GLint x[], const GLint y[],
 179                                  const GLubyte mask[] )
 180 {
 181    int i;
 182    /* use current rgb color */
 183    for (i=0; i<n; i++) {
 184       if (mask[i]) {
 185          __svga_drawpixel16( x[i], y[i], SVGAMesa->hicolor );
 186       }
 187    }
 188 }
 189
 190 void __read_rgba_pixels16( const GLcontext *ctx,
 191                            GLuint n, const GLint x[], const GLint y[],
 192                            GLubyte rgba[][4], const GLubyte mask[] )
 193 {
 194    int i,pix;
 195    for (i=0; i<n; i++,x++) {
 196     pix = __svga_getpixel16( x[i], y[i] );
 197     rgba[i][RCOMP] = ((pix>>11)<<3) & 0xff;
 198     rgba[i][GCOMP] = ((pix>> 5)<<2) & 0xff;
 199     rgba[i][BCOMP] = ((pix    )<<3) & 0xff;
 200    }
 201 }
 202
 203 #else
 204
 205
 206 /* silence compiler warning */
 207 extern void _mesa_svga16_dummy_function(void);
 208 void _mesa_svga16_dummy_function(void)
 209 {
 210 }
 211
 212
 213 #endif