src/mesa/drivers/svga/svgamesa15.c

   1 /* $Id: svgamesa15.c,v 1.7 2000/11/14 17:40:14 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 "svgamesa15.h"
  38
  39 static void __svga_drawpixel15(int x, int y, unsigned long c)
  40 {
  41     unsigned long offset;
  42     GLshort *shortBuffer=(void *)SVGABuffer.DrawBuffer;
  43     y = SVGAInfo->height-y-1;
  44     offset = y * SVGAInfo->width + x;
  45     shortBuffer[offset]=c;
  46 }
  47
  48 static unsigned long __svga_getpixel15(int x, int y)
  49 {
  50     unsigned long offset;
  51     GLshort *shortBuffer=(void *)SVGABuffer.ReadBuffer;
  52     y = SVGAInfo->height-y-1;
  53     offset = y * SVGAInfo->width + x;
  54     return shortBuffer[offset];
  55 }
  56
  57 void __clear_color15( GLcontext *ctx,
  58                       GLubyte red, GLubyte green,
  59                       GLubyte blue, GLubyte alpha )
  60 {
  61    SVGAMesa->clear_hicolor=(red>>3)<<10 | (green>>3)<<5 | (blue>>3);
  62 /*   SVGAMesa->clear_hicolor=(red)<<10 | (green)<<5 | (blue);*/
  63 }
  64
  65 GLbitfield __clear15( GLcontext *ctx, GLbitfield mask, GLboolean all,
  66                       GLint x, GLint y, GLint width, GLint height )
  67 {
  68    int i, j;
  69
  70    if (mask & DD_FRONT_LEFT_BIT) {
  71       GLshort *shortBuffer=(void *)SVGABuffer.FrontBuffer;
  72       if (all) {
  73          for (i=0;i<SVGABuffer.BufferSize / 2;i++)
  74             shortBuffer[i]=SVGAMesa->clear_hicolor;
  75       }
  76       else {
  77          GLubyte *tmp = SVGABuffer.DrawBuffer;
  78          SVGABuffer.DrawBuffer = SVGABuffer.FrontBuffer;
  79          for (i=x;i<width;i++)
  80             for (j=y;j<height;j++)
  81                __svga_drawpixel15(i,j,SVGAMesa->clear_hicolor);
  82          SVGABuffer.DrawBuffer = tmp;
  83       }
  84    }
  85    if (mask & DD_BACK_LEFT_BIT) {
  86       GLshort *shortBuffer=(void *)SVGABuffer.BackBuffer;
  87       if (all) {
  88          for (i=0;i<SVGABuffer.BufferSize / 2;i++)
  89             shortBuffer[i]=SVGAMesa->clear_hicolor;
  90       }
  91       else {
  92          GLubyte *tmp = SVGABuffer.DrawBuffer;
  93          SVGABuffer.DrawBuffer = SVGABuffer.BackBuffer;
  94          for (i=x;i<width;i++)
  95             for (j=y;j<height;j++)
  96                __svga_drawpixel15(i,j,SVGAMesa->clear_hicolor);
  97          SVGABuffer.DrawBuffer = tmp;
  98       }
  99    }
 100    return mask & (~(DD_FRONT_LEFT_BIT | DD_BACK_LEFT_BIT));
 101 }
 102
 103 void __write_rgba_span15( const GLcontext *ctx, GLuint n, GLint x, GLint y,
 104                           const GLubyte rgba[][4], const GLubyte mask[] )
 105 {
 106    int i;
 107    if (mask) {
 108       /* draw some pixels */
 109       for (i=0; i<n; i++, x++) {
 110          if (mask[i]) {
 111          __svga_drawpixel15( x, y, (rgba[i][RCOMP]>>3)<<10 | \
 112                                    (rgba[i][GCOMP]>>3)<<5 |  \
 113                                    (rgba[i][BCOMP]>>3));
 114          }
 115       }
 116    }
 117    else {
 118       /* draw all pixels */
 119       for (i=0; i<n; i++, x++) {
 120          __svga_drawpixel15( x, y, (rgba[i][RCOMP]>>3)<<10 | \
 121                                    (rgba[i][GCOMP]>>3)<<5  | \
 122                                    (rgba[i][BCOMP]>>3));
 123       }
 124    }
 125 }
 126
 127 void __write_mono_rgba_span15( const GLcontext *ctx,
 128                                GLuint n, GLint x, GLint y,
 129                                const GLchan color[4], const GLubyte mask[])
 130 {
 131    GLushort hicolor = (color[RCOMP] >> 3) << 10 |
 132                       (color[GCOMP] >> 3) << 5 |
 133                       (color[BCOMP] >> 3);
 134    int i;
 135    for (i=0; i<n; i++, x++) {
 136       if (mask[i]) {
 137          __svga_drawpixel15( x, y, hicolor);
 138       }
 139    }
 140 }
 141
 142 void __read_rgba_span15( 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_getpixel15( x, y);
 148     rgba[i][RCOMP] = ((pix>>10)<<3) & 0xff;
 149     rgba[i][GCOMP] = ((pix>> 5)<<3) & 0xff;
 150     rgba[i][BCOMP] = ((pix    )<<3) & 0xff;
 151    }
 152 }
 153
 154 void __write_rgba_pixels15( 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_drawpixel15( x[i], y[i], (rgba[i][RCOMP]>>3)<<10 | \
 162                                          (rgba[i][GCOMP]>>3)<<5  | \
 163                                          (rgba[i][BCOMP]>>3));
 164       }
 165    }
 166 }
 167
 168
 169 void __write_mono_rgba_pixels15( 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) << 10 |
 175                       (color[GCOMP] >> 3) << 5 |
 176                       (color[BCOMP] >> 3);
 177    int i;
 178    /* use current rgb color */
 179    for (i=0; i<n; i++) {
 180       if (mask[i]) {
 181          __svga_drawpixel15( x[i], y[i], hicolor );
 182       }
 183    }
 184 }
 185
 186 void __read_rgba_pixels15( 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_getpixel15( x[i], y[i] );
 193     rgba[i][RCOMP] = ((pix>>10)<<3) & 0xff;
 194     rgba[i][GCOMP] = ((pix>> 5)<<3) & 0xff;
 195     rgba[i][BCOMP] = ((pix    )<<3) & 0xff;
 196    }
 197 }
 198
 199 #else
 200
 201
 202 /* silence compiler warning */
 203 extern void _mesa_svga15_dummy_function(void);
 204 void _mesa_svga15_dummy_function(void)
 205 {
 206 }
 207
 208
 209 #endif