src/mesa/drivers/svga/svgamesa16.c

   1 /* $Id: svgamesa16.c,v 1.8 2001/01/24 00:04:59 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 __clear_color16( GLcontext *ctx, const GLchan color[4] )
  60 {
  61     SVGAMesa->clear_hicolor = (color[0] >> 3) << 11 |
  62                               (color[1] >> 2) << 5 |
  63                               (color[2] >> 3);
  64 /*    SVGAMesa->clear_hicolor=(red)<<11 | (green)<<5 | (blue); */
  65 }
  66
  67 GLbitfield __clear16( GLcontext *ctx, GLbitfield mask, GLboolean all,
  68                       GLint x, GLint y, GLint width, GLint height )
  69 {
  70    int i,j;
  71
  72    if (mask & DD_FRONT_LEFT_BIT) {
  73       if (all) {
  74          GLshort *shortBuffer=(void *)SVGABuffer.FrontBuffer;
  75          for (i=0;i<SVGABuffer.BufferSize / 2;i++)
  76             shortBuffer[i]=SVGAMesa->clear_hicolor;
  77       }
  78       else {
  79          GLubyte *tmp = SVGABuffer.DrawBuffer;
  80          SVGABuffer.DrawBuffer = SVGABuffer.FrontBuffer;
  81          for (i=x;i<width;i++)
  82             for (j=y;j<height;j++)
  83                __svga_drawpixel16(i,j,SVGAMesa->clear_hicolor);
  84          SVGABuffer.DrawBuffer = tmp;
  85       }
  86    }
  87    if (mask & DD_BACK_LEFT_BIT) {
  88       if (all) {
  89          GLshort *shortBuffer=(void *)SVGABuffer.BackBuffer;
  90          for (i=0;i<SVGABuffer.BufferSize / 2;i++)
  91             shortBuffer[i]=SVGAMesa->clear_hicolor;
  92       }
  93       else {
  94          GLubyte *tmp = SVGABuffer.DrawBuffer;
  95          SVGABuffer.DrawBuffer = SVGABuffer.BackBuffer;
  96          for (i=x;i<width;i++)
  97             for (j=y;j<height;j++)
  98                __svga_drawpixel16(i,j,SVGAMesa->clear_hicolor);
  99          SVGABuffer.DrawBuffer = tmp;
 100       }
 101    }
 102    return mask & (~(DD_FRONT_LEFT_BIT | DD_BACK_LEFT_BIT));
 103 }
 104
 105 void __write_rgba_span16( const GLcontext *ctx, GLuint n, GLint x, GLint y,
 106                           const GLubyte rgba[][4], const GLubyte mask[] )
 107 {
 108    int i;
 109    if (mask) {
 110       /* draw some pixels */
 111       for (i=0; i<n; i++, x++) {
 112          if (mask[i]) {
 113          __svga_drawpixel16( x, y, (rgba[i][RCOMP]>>3)<<11 | \
 114                                    (rgba[i][GCOMP]>>2)<<5  | \
 115                                    (rgba[i][BCOMP]>>3));
 116          }
 117       }
 118    }
 119    else {
 120       /* draw all pixels */
 121       for (i=0; i<n; i++, x++) {
 122          __svga_drawpixel16( x, y, (rgba[i][RCOMP]>>3)<<11 | \
 123                                    (rgba[i][GCOMP]>>2)<<5  | \
 124                                    (rgba[i][BCOMP]>>3));
 125       }
 126    }
 127 }
 128
 129 void __write_mono_rgba_span16( const GLcontext *ctx,
 130                                GLuint n, GLint x, GLint y,
 131                                const GLchan color[4], const GLubyte mask[])
 132 {
 133    GLushort hicolor=(color[RCOMP]>>3)<<11 | (color[GCOMP]>>2)<<5 | (color[BCOMP]>>3);
 134    int i;
 135    for (i=0; i<n; i++, x++) {
 136       if (mask[i]) {
 137          __svga_drawpixel16( x, y, hicolor);
 138       }
 139    }
 140 }
 141
 142 void __read_rgba_span16( const GLcontext *ctx, GLuint n, GLint x, GLint y,
 143                          GLubyte rgba[][4] )
 144 {
 145    int i,pix;
 146    for (i=0; i<n; i++, x++) {
 147     pix = __svga_getpixel16( x, y );
 148     rgba[i][RCOMP] = ((pix>>11)<<3) & 0xff;
 149     rgba[i][GCOMP] = ((pix>> 5)<<2) & 0xff;
 150     rgba[i][BCOMP] = ((pix    )<<3) & 0xff;
 151    }
 152 }
 153
 154 void __write_rgba_pixels16( const GLcontext *ctx,
 155                             GLuint n, const GLint x[], const GLint y[],
 156                             const GLubyte rgba[][4], const GLubyte mask[] )
 157 {
 158    int i;
 159    for (i=0; i<n; i++) {
 160       if (mask[i]) {
 161          __svga_drawpixel16( x[i], y[i], (rgba[i][RCOMP]>>3)<<11 | \
 162                                          (rgba[i][GCOMP]>>2)<<5  | \
 163                                          (rgba[i][BCOMP]>>3));
 164       }
 165    }
 166 }
 167
 168
 169 void __write_mono_rgba_pixels16( const GLcontext *ctx,
 170                                  GLuint n,
 171                                  const GLint x[], const GLint y[],
 172                                  const GLchan color[4], const GLubyte mask[] )
 173 {
 174    GLushort hicolor=(color[RCOMP]>>3)<<11 | (color[GCOMP]>>2)<<5 | (color[BCOMP]>>3);
 175    int i;
 176    for (i=0; i<n; i++) {
 177       if (mask[i]) {
 178          __svga_drawpixel16( x[i], y[i], hicolor );
 179       }
 180    }
 181 }
 182
 183 void __read_rgba_pixels16( const GLcontext *ctx,
 184                            GLuint n, const GLint x[], const GLint y[],
 185                            GLubyte rgba[][4], const GLubyte mask[] )
 186 {
 187    int i,pix;
 188    for (i=0; i<n; i++,x++) {
 189     pix = __svga_getpixel16( x[i], y[i] );
 190     rgba[i][RCOMP] = ((pix>>11)<<3) & 0xff;
 191     rgba[i][GCOMP] = ((pix>> 5)<<2) & 0xff;
 192     rgba[i][BCOMP] = ((pix    )<<3) & 0xff;
 193    }
 194 }
 195
 196 #else
 197
 198
 199 /* silence compiler warning */
 200 extern void _mesa_svga16_dummy_function(void);
 201 void _mesa_svga16_dummy_function(void)
 202 {
 203 }
 204
 205
 206 #endif