src/mesa/drivers/svga/svgamesa15.c

   1 /* $Id: svgamesa15.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 "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 __set_color15( GLcontext *ctx,
  58                     GLubyte red, GLubyte green,
  59                     GLubyte blue, GLubyte alpha )
  60 {
  61    SVGAMesa->hicolor=(red>>3)<<10 | (green>>3)<<5 | (blue>>3);
  62 /*   SVGAMesa->hicolor=(red)<<10 | (green)<<5 | (blue); */
  63 }
  64
  65 void __clear_color15( GLcontext *ctx,
  66                       GLubyte red, GLubyte green,
  67                       GLubyte blue, GLubyte alpha )
  68 {
  69    SVGAMesa->clear_hicolor=(red>>3)<<10 | (green>>3)<<5 | (blue>>3);
  70 /*   SVGAMesa->clear_hicolor=(red)<<10 | (green)<<5 | (blue);*/
  71 }
  72
  73 GLbitfield __clear15( GLcontext *ctx, GLbitfield mask, GLboolean all,
  74                       GLint x, GLint y, GLint width, GLint height )
  75 {
  76    int i, j;
  77
  78    if (mask & DD_FRONT_LEFT_BIT) {
  79       GLshort *shortBuffer=(void *)SVGABuffer.FrontBuffer;
  80       if (all) {
  81          for (i=0;i<SVGABuffer.BufferSize / 2;i++)
  82             shortBuffer[i]=SVGAMesa->clear_hicolor;
  83       }
  84       else {
  85          GLubyte *tmp = SVGABuffer.DrawBuffer;
  86          SVGABuffer.DrawBuffer = SVGABuffer.FrontBuffer;
  87          for (i=x;i<width;i++)
  88             for (j=y;j<height;j++)
  89                __svga_drawpixel15(i,j,SVGAMesa->clear_hicolor);
  90          SVGABuffer.DrawBuffer = tmp;
  91       }
  92    }
  93    if (mask & DD_BACK_LEFT_BIT) {
  94       GLshort *shortBuffer=(void *)SVGABuffer.BackBuffer;
  95       if (all) {
  96          for (i=0;i<SVGABuffer.BufferSize / 2;i++)
  97             shortBuffer[i]=SVGAMesa->clear_hicolor;
  98       }
  99       else {
 100          GLubyte *tmp = SVGABuffer.DrawBuffer;
 101          SVGABuffer.DrawBuffer = SVGABuffer.BackBuffer;
 102          for (i=x;i<width;i++)
 103             for (j=y;j<height;j++)
 104                __svga_drawpixel15(i,j,SVGAMesa->clear_hicolor);
 105          SVGABuffer.DrawBuffer = tmp;
 106       }
 107    }
 108    return mask & (~(DD_FRONT_LEFT_BIT | DD_BACK_LEFT_BIT));
 109 }
 110
 111 void __write_rgba_span15( const GLcontext *ctx, GLuint n, GLint x, GLint y,
 112                           const GLubyte rgba[][4], const GLubyte mask[] )
 113 {
 114    int i;
 115    if (mask) {
 116       /* draw some pixels */
 117       for (i=0; i<n; i++, x++) {
 118          if (mask[i]) {
 119          __svga_drawpixel15( x, y, (rgba[i][RCOMP]>>3)<<10 | \
 120                                    (rgba[i][GCOMP]>>3)<<5 |  \
 121                                    (rgba[i][BCOMP]>>3));
 122          }
 123       }
 124    }
 125    else {
 126       /* draw all pixels */
 127       for (i=0; i<n; i++, x++) {
 128          __svga_drawpixel15( x, y, (rgba[i][RCOMP]>>3)<<10 | \
 129                                    (rgba[i][GCOMP]>>3)<<5  | \
 130                                    (rgba[i][BCOMP]>>3));
 131       }
 132    }
 133 }
 134
 135 void __write_mono_rgba_span15( const GLcontext *ctx,
 136                                GLuint n, GLint x, GLint y,
 137                                const GLubyte mask[])
 138 {
 139    int i;
 140    for (i=0; i<n; i++, x++) {
 141       if (mask[i]) {
 142          __svga_drawpixel15( x, y, SVGAMesa->hicolor);
 143       }
 144    }
 145 }
 146
 147 void __read_rgba_span15( const GLcontext *ctx, GLuint n, GLint x, GLint y,
 148                          GLubyte rgba[][4] )
 149 {
 150    int i,pix;
 151    for (i=0; i<n; i++, x++) {
 152     pix = __svga_getpixel15( x, y);
 153     rgba[i][RCOMP] = ((pix>>10)<<3) & 0xff;
 154     rgba[i][GCOMP] = ((pix>> 5)<<3) & 0xff;
 155     rgba[i][BCOMP] = ((pix    )<<3) & 0xff;
 156    }
 157 }
 158
 159 void __write_rgba_pixels15( const GLcontext *ctx,
 160                             GLuint n, const GLint x[], const GLint y[],
 161                             const GLubyte rgba[][4], const GLubyte mask[] )
 162 {
 163    int i;
 164    for (i=0; i<n; i++) {
 165       if (mask[i]) {
 166          __svga_drawpixel15( x[i], y[i], (rgba[i][RCOMP]>>3)<<10 | \
 167                                          (rgba[i][GCOMP]>>3)<<5  | \
 168                                          (rgba[i][BCOMP]>>3));
 169       }
 170    }
 171 }
 172
 173
 174 void __write_mono_rgba_pixels15( const GLcontext *ctx,
 175                                  GLuint n,
 176                                  const GLint x[], const GLint y[],
 177                                  const GLubyte mask[] )
 178 {
 179    int i;
 180    /* use current rgb color */
 181    for (i=0; i<n; i++) {
 182       if (mask[i]) {
 183          __svga_drawpixel15( x[i], y[i], SVGAMesa->hicolor );
 184       }
 185    }
 186 }
 187
 188 void __read_rgba_pixels15( const GLcontext *ctx,
 189                            GLuint n, const GLint x[], const GLint y[],
 190                            GLubyte rgba[][4], const GLubyte mask[] )
 191 {
 192    int i,pix;
 193    for (i=0; i<n; i++,x++) {
 194     pix = __svga_getpixel15( x[i], y[i] );
 195     rgba[i][RCOMP] = ((pix>>10)<<3) & 0xff;
 196     rgba[i][GCOMP] = ((pix>> 5)<<3) & 0xff;
 197     rgba[i][BCOMP] = ((pix    )<<3) & 0xff;
 198    }
 199 }
 200
 201 #else
 202
 203
 204 /* silence compiler warning */
 205 extern void _mesa_svga15_dummy_function(void);
 206 void _mesa_svga15_dummy_function(void)
 207 {
 208 }
 209
 210
 211 #endif