src/mesa/drivers/svga/svgamesa16.c

   1 /* $Id: svgamesa16.c,v 1.4 2000/01/25 00:03:02 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 SVGA
  31
  32 #include "svgapix.h"
  33 #include "svgamesa16.h"
  34
  35
  36 static void __svga_drawpixel16(int x, int y, unsigned long c)
  37 {
  38     unsigned long offset;
  39     GLshort *shortBuffer=(void *)SVGABuffer.DrawBuffer;
  40     y = SVGAInfo->height-y-1;
  41     offset = y * SVGAInfo->width + x;
  42     shortBuffer[offset]=c;
  43 }
  44
  45 static unsigned long __svga_getpixel16(int x, int y)
  46 {
  47     unsigned long offset;
  48
  49     GLshort *shortBuffer=(void *)SVGABuffer.ReadBuffer;
  50     y = SVGAInfo->height-y-1;
  51     offset = y * SVGAInfo->width + x;
  52     return shortBuffer[offset];
  53 }
  54
  55 void __set_color16( GLcontext *ctx,
  56                     GLubyte red, GLubyte green,
  57                     GLubyte blue, GLubyte alpha )
  58 {
  59     SVGAMesa->hicolor=(red>>3)<<11 | (green>>2)<<5 | (blue>>3);
  60 /*    SVGAMesa->hicolor=(red)<<11 | (green)<<5 | (blue); */
  61 }
  62
  63 void __clear_color16( GLcontext *ctx,
  64                       GLubyte red, GLubyte green,
  65                       GLubyte blue, GLubyte alpha )
  66 {
  67     SVGAMesa->clear_hicolor=(red>>3)<<11 | (green>>2)<<5 | (blue>>3);
  68 /*    SVGAMesa->clear_hicolor=(red)<<11 | (green)<<5 | (blue); */
  69 }
  70
  71 GLbitfield __clear16( GLcontext *ctx, GLbitfield mask, GLboolean all,
  72                       GLint x, GLint y, GLint width, GLint height )
  73 {
  74    int i,j;
  75
  76    if (mask & DD_FRONT_LEFT_BIT) {
  77       if (all) {
  78          GLshort *shortBuffer=(void *)SVGABuffer.FrontBuffer;
  79          for (i=0;i<SVGABuffer.BufferSize / 2;i++)
  80             shortBuffer[i]=SVGAMesa->clear_hicolor;
  81       }
  82       else {
  83          GLubyte *tmp = SVGABuffer.DrawBuffer;
  84          SVGABuffer.DrawBuffer = SVGABuffer.FrontBuffer;
  85          for (i=x;i<width;i++)
  86             for (j=y;j<height;j++)
  87                __svga_drawpixel16(i,j,SVGAMesa->clear_hicolor);
  88          SVGABuffer.DrawBuffer = tmp;
  89       }
  90    }
  91    if (mask & DD_BACK_LEFT_BIT) {
  92       if (all) {
  93          GLshort *shortBuffer=(void *)SVGABuffer.BackBuffer;
  94          for (i=0;i<SVGABuffer.BufferSize / 2;i++)
  95             shortBuffer[i]=SVGAMesa->clear_hicolor;
  96       }
  97       else {
  98          GLubyte *tmp = SVGABuffer.DrawBuffer;
  99          SVGABuffer.DrawBuffer = SVGABuffer.BackBuffer;
 100          for (i=x;i<width;i++)
 101             for (j=y;j<height;j++)
 102                __svga_drawpixel16(i,j,SVGAMesa->clear_hicolor);
 103          SVGABuffer.DrawBuffer = tmp;
 104       }
 105    }
 106    return mask & (~(DD_FRONT_LEFT_BIT | DD_BACK_LEFT_BIT));
 107 }
 108
 109 void __write_rgba_span16( const GLcontext *ctx, GLuint n, GLint x, GLint y,
 110                           const GLubyte rgba[][4], const GLubyte mask[] )
 111 {
 112    int i;
 113    if (mask) {
 114       /* draw some pixels */
 115       for (i=0; i<n; i++, x++) {
 116          if (mask[i]) {
 117          __svga_drawpixel16( x, y, (rgba[i][RCOMP]>>3)<<11 | \
 118                                    (rgba[i][GCOMP]>>2)<<5  | \
 119                                    (rgba[i][BCOMP]>>3));
 120          }
 121       }
 122    }
 123    else {
 124       /* draw all pixels */
 125       for (i=0; i<n; i++, x++) {
 126          __svga_drawpixel16( x, y, (rgba[i][RCOMP]>>3)<<11 | \
 127                                    (rgba[i][GCOMP]>>2)<<5  | \
 128                                    (rgba[i][BCOMP]>>3));
 129       }
 130    }
 131 }
 132
 133 void __write_mono_rgba_span16( const GLcontext *ctx,
 134                                GLuint n, GLint x, GLint y,
 135                                const GLubyte mask[])
 136 {
 137    int i;
 138    for (i=0; i<n; i++, x++) {
 139       if (mask[i]) {
 140          __svga_drawpixel16( x, y, SVGAMesa->hicolor);
 141       }
 142    }
 143 }
 144
 145 void __read_rgba_span16( const GLcontext *ctx, GLuint n, GLint x, GLint y,
 146                          GLubyte rgba[][4] )
 147 {
 148    int i,pix;
 149    for (i=0; i<n; i++, x++) {
 150     pix = __svga_getpixel16( x, y );
 151     rgba[i][RCOMP] = ((pix>>11)<<3) & 0xff;
 152     rgba[i][GCOMP] = ((pix>> 5)<<2) & 0xff;
 153     rgba[i][BCOMP] = ((pix    )<<3) & 0xff;
 154    }
 155 }
 156
 157 void __write_rgba_pixels16( const GLcontext *ctx,
 158                             GLuint n, const GLint x[], const GLint y[],
 159                             const GLubyte rgba[][4], const GLubyte mask[] )
 160 {
 161    int i;
 162    for (i=0; i<n; i++) {
 163       if (mask[i]) {
 164          __svga_drawpixel16( x[i], y[i], (rgba[i][RCOMP]>>3)<<11 | \
 165                                          (rgba[i][GCOMP]>>2)<<5  | \
 166                                          (rgba[i][BCOMP]>>3));
 167       }
 168    }
 169 }
 170
 171
 172 void __write_mono_rgba_pixels16( const GLcontext *ctx,
 173                                  GLuint n,
 174                                  const GLint x[], const GLint y[],
 175                                  const GLubyte mask[] )
 176 {
 177    int i;
 178    /* use current rgb color */
 179    for (i=0; i<n; i++) {
 180       if (mask[i]) {
 181          __svga_drawpixel16( x[i], y[i], SVGAMesa->hicolor );
 182       }
 183    }
 184 }
 185
 186 void __read_rgba_pixels16( const GLcontext *ctx,
 187                            GLuint n, const GLint x[], const GLint y[],
 188                            GLubyte rgba[][4], const GLubyte mask[] )
 189 {
 190    int i,pix;
 191    for (i=0; i<n; i++,x++) {
 192     pix = __svga_getpixel16( x[i], y[i] );
 193     rgba[i][RCOMP] = ((pix>>11)<<3) & 0xff;
 194     rgba[i][GCOMP] = ((pix>> 5)<<2) & 0xff;
 195     rgba[i][BCOMP] = ((pix    )<<3) & 0xff;
 196    }
 197 }
 198
 199 #endif