src/mesa/drivers/svga/svgamesa16.c

   1 /* $Id: svgamesa16.c,v 1.2 2000/01/22 20:08:36 brianp Exp $ */
   2
   3 /*
   4  * Mesa 3-D graphics library
   5  * Version:  3.2
   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
  31 #include "svgapix.h"
  32
  33 GLshort * shortBuffer;
  34
  35 int __svga_drawpixel16(int x, int y, unsigned long c)
  36 {
  37     unsigned long offset;
  38
  39     shortBuffer=(void *)SVGABuffer.BackBuffer;
  40     y = SVGAInfo->height-y-1;
  41     offset = y * SVGAInfo->width + x;
  42     shortBuffer[offset]=c;
  43     return 0;
  44 }
  45
  46 unsigned long __svga_getpixel16(int x, int y)
  47 {
  48     unsigned long offset;
  49
  50     shortBuffer=(void *)SVGABuffer.BackBuffer;
  51     y = SVGAInfo->height-y-1;
  52     offset = y * SVGAInfo->width + x;
  53     return shortBuffer[offset];
  54 }
  55
  56 void __set_color16( GLcontext *ctx,
  57                     GLubyte red, GLubyte green,
  58                     GLubyte blue, GLubyte alpha )
  59 {
  60     SVGAMesa->hicolor=(red>>3)<<11 | (green>>2)<<5 | (blue>>3);
  61 /*    SVGAMesa->hicolor=(red)<<11 | (green)<<5 | (blue); */
  62 }
  63
  64 void __clear_color16( GLcontext *ctx,
  65                       GLubyte red, GLubyte green,
  66                       GLubyte blue, GLubyte alpha )
  67 {
  68     SVGAMesa->clear_hicolor=(red>>3)<<11 | (green>>2)<<5 | (blue>>3);
  69 /*    SVGAMesa->clear_hicolor=(red)<<11 | (green)<<5 | (blue); */
  70 }
  71
  72 GLbitfield __clear16( GLcontext *ctx, GLbitfield mask, GLboolean all,
  73                       GLint x, GLint y, GLint width, GLint height )
  74 {
  75    int i,j;
  76
  77    if (mask & GL_COLOR_BUFFER_BIT) {
  78     if (all) {
  79      shortBuffer=(void *)SVGABuffer.BackBuffer;
  80      for (i=0;i<SVGABuffer.BufferSize / 2;i++) shortBuffer[i]=SVGAMesa->clear_hicolor;
  81     } else {
  82     for (i=x;i<width;i++)
  83      for (j=y;j<height;j++)
  84       __svga_drawpixel16(i,j,SVGAMesa->clear_hicolor);
  85     }
  86    }
  87    return mask & (~GL_COLOR_BUFFER_BIT);
  88 }
  89
  90 void __write_rgba_span16( const GLcontext *ctx, GLuint n, GLint x, GLint y,
  91                           const GLubyte rgba[][4], const GLubyte mask[] )
  92 {
  93    int i;
  94    if (mask) {
  95       /* draw some pixels */
  96       for (i=0; i<n; i++, x++) {
  97          if (mask[i]) {
  98          __svga_drawpixel16( x, y, (rgba[i][RCOMP]>>3)<<11 | \
  99                                    (rgba[i][GCOMP]>>2)<<5  | \
 100                                    (rgba[i][BCOMP]>>3));
 101          }
 102       }
 103    }
 104    else {
 105       /* draw all pixels */
 106       for (i=0; i<n; i++, x++) {
 107          __svga_drawpixel16( x, y, (rgba[i][RCOMP]>>3)<<11 | \
 108                                    (rgba[i][GCOMP]>>2)<<5  | \
 109                                    (rgba[i][BCOMP]>>3));
 110       }
 111    }
 112 }
 113
 114 void __write_mono_rgba_span16( const GLcontext *ctx,
 115                                GLuint n, GLint x, GLint y,
 116                                const GLubyte mask[])
 117 {
 118    int i;
 119    for (i=0; i<n; i++, x++) {
 120       if (mask[i]) {
 121          __svga_drawpixel16( x, y, SVGAMesa->hicolor);
 122       }
 123    }
 124 }
 125
 126 void __read_rgba_span16( const GLcontext *ctx, GLuint n, GLint x, GLint y,
 127                          GLubyte rgba[][4] )
 128 {
 129    int i,pix;
 130    for (i=0; i<n; i++, x++) {
 131     pix = __svga_getpixel16( x, y );
 132     rgba[i][RCOMP] = ((pix>>11)<<3) & 0xff;
 133     rgba[i][GCOMP] = ((pix>> 5)<<2) & 0xff;
 134     rgba[i][BCOMP] = ((pix    )<<3) & 0xff;
 135    }
 136 }
 137
 138 void __write_rgba_pixels16( const GLcontext *ctx,
 139                             GLuint n, const GLint x[], const GLint y[],
 140                             const GLubyte rgba[][4], const GLubyte mask[] )
 141 {
 142    int i;
 143    for (i=0; i<n; i++) {
 144       if (mask[i]) {
 145          __svga_drawpixel16( x[i], y[i], (rgba[i][RCOMP]>>3)<<11 | \
 146                                          (rgba[i][GCOMP]>>2)<<5  | \
 147                                          (rgba[i][BCOMP]>>3));
 148       }
 149    }
 150 }
 151
 152
 153 void __write_mono_rgba_pixels16( const GLcontext *ctx,
 154                                  GLuint n,
 155                                  const GLint x[], const GLint y[],
 156                                  const GLubyte mask[] )
 157 {
 158    int i;
 159    /* use current rgb color */
 160    for (i=0; i<n; i++) {
 161       if (mask[i]) {
 162          __svga_drawpixel16( x[i], y[i], SVGAMesa->hicolor );
 163       }
 164    }
 165 }
 166
 167 void __read_rgba_pixels16( const GLcontext *ctx,
 168                            GLuint n, const GLint x[], const GLint y[],
 169                            GLubyte rgba[][4], const GLubyte mask[] )
 170 {
 171    int i,pix;
 172    for (i=0; i<n; i++,x++) {
 173     pix = __svga_getpixel16( x[i], y[i] );
 174     rgba[i][RCOMP] = ((pix>>11)<<3) & 0xff;
 175     rgba[i][GCOMP] = ((pix>> 5)<<2) & 0xff;
 176     rgba[i][BCOMP] = ((pix    )<<3) & 0xff;
 177    }
 178 }