src/mesa/drivers/svga/svgamesa15.c

   1 /* $Id: svgamesa15.c,v 1.11 2002/11/11 18:42:39 brianp Exp $ */
   2
   3 /*
   4  * Mesa 3-D graphics library
   5  * Version:  5.0
   6  * Copyright (C) 1995-2002  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 #include "swrast/swrast.h"
  39
  40
  41 static void __svga_drawpixel15(int x, int y, unsigned long c)
  42 {
  43     unsigned long offset;
  44     GLshort *shortBuffer=(void *)SVGABuffer.DrawBuffer;
  45     y = SVGAInfo->height-y-1;
  46     offset = y * SVGAInfo->width + x;
  47     shortBuffer[offset]=c;
  48 }
  49
  50 static unsigned long __svga_getpixel15(int x, int y)
  51 {
  52     unsigned long offset;
  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_color15( GLcontext *ctx, const GLfloat color[4] )
  60 {
  61    GLubyte col[3];
  62    CLAMPED_FLOAT_TO_UBYTE(col[0], color[0]);
  63    CLAMPED_FLOAT_TO_UBYTE(col[1], color[1]);
  64    CLAMPED_FLOAT_TO_UBYTE(col[2], color[2]);
  65    SVGAMesa->clear_hicolor=(col[0]>>3)<<10 | (col[1]>>3)<<5 | (col[2]>>3);
  66 /*   SVGAMesa->clear_hicolor=(red)<<10 | (green)<<5 | (blue);*/
  67 }
  68
  69 void __clear15( GLcontext *ctx, GLbitfield mask, GLboolean all,
  70                 GLint x, GLint y, GLint width, GLint height )
  71 {
  72    int i, j;
  73
  74    if (mask & DD_FRONT_LEFT_BIT) {
  75       GLshort *shortBuffer=(void *)SVGABuffer.FrontBuffer;
  76       if (all) {
  77          for (i=0;i<SVGABuffer.BufferSize / 2;i++)
  78             shortBuffer[i]=SVGAMesa->clear_hicolor;
  79       }
  80       else {
  81          GLubyte *tmp = SVGABuffer.DrawBuffer;
  82          SVGABuffer.DrawBuffer = SVGABuffer.FrontBuffer;
  83          for (i=x;i<width;i++)
  84             for (j=y;j<height;j++)
  85                __svga_drawpixel15(i,j,SVGAMesa->clear_hicolor);
  86          SVGABuffer.DrawBuffer = tmp;
  87       }
  88       mask &= ~DD_FRONT_LEFT_BIT;
  89    }
  90    if (mask & DD_BACK_LEFT_BIT) {
  91       GLshort *shortBuffer=(void *)SVGABuffer.BackBuffer;
  92       if (all) {
  93          for (i=0;i<SVGABuffer.BufferSize / 2;i++)
  94             shortBuffer[i]=SVGAMesa->clear_hicolor;
  95       }
  96       else {
  97          GLubyte *tmp = SVGABuffer.DrawBuffer;
  98          SVGABuffer.DrawBuffer = SVGABuffer.BackBuffer;
  99          for (i=x;i<width;i++)
 100             for (j=y;j<height;j++)
 101                __svga_drawpixel15(i,j,SVGAMesa->clear_hicolor);
 102          SVGABuffer.DrawBuffer = tmp;
 103       }
 104       mask &= ~DD_BACK_LEFT_BIT;
 105    }
 106
 107    if (mask)
 108       _swrast_Clear( ctx, mask, all, x, y, width, height );
 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 GLchan color[4], const GLubyte mask[])
 138 {
 139    GLushort hicolor = (color[RCOMP] >> 3) << 10 |
 140                       (color[GCOMP] >> 3) << 5 |
 141                       (color[BCOMP] >> 3);
 142    int i;
 143    for (i=0; i<n; i++, x++) {
 144       if (mask[i]) {
 145          __svga_drawpixel15( x, y, hicolor);
 146       }
 147    }
 148 }
 149
 150 void __read_rgba_span15( const GLcontext *ctx, GLuint n, GLint x, GLint y,
 151                          GLubyte rgba[][4] )
 152 {
 153    int i,pix;
 154    for (i=0; i<n; i++, x++) {
 155     pix = __svga_getpixel15( x, y);
 156     rgba[i][RCOMP] = ((pix>>10)<<3) & 0xff;
 157     rgba[i][GCOMP] = ((pix>> 5)<<3) & 0xff;
 158     rgba[i][BCOMP] = ((pix    )<<3) & 0xff;
 159    }
 160 }
 161
 162 void __write_rgba_pixels15( const GLcontext *ctx,
 163                             GLuint n, const GLint x[], const GLint y[],
 164                             const GLubyte rgba[][4], const GLubyte mask[] )
 165 {
 166    int i;
 167    for (i=0; i<n; i++) {
 168       if (mask[i]) {
 169          __svga_drawpixel15( x[i], y[i], (rgba[i][RCOMP]>>3)<<10 | \
 170                                          (rgba[i][GCOMP]>>3)<<5  | \
 171                                          (rgba[i][BCOMP]>>3));
 172       }
 173    }
 174 }
 175
 176
 177 void __write_mono_rgba_pixels15( const GLcontext *ctx,
 178                                  GLuint n,
 179                                  const GLint x[], const GLint y[],
 180                                  const GLchan color[4], const GLubyte mask[] )
 181 {
 182    GLushort hicolor = (color[RCOMP] >> 3) << 10 |
 183                       (color[GCOMP] >> 3) << 5 |
 184                       (color[BCOMP] >> 3);
 185    int i;
 186    /* use current rgb color */
 187    for (i=0; i<n; i++) {
 188       if (mask[i]) {
 189          __svga_drawpixel15( x[i], y[i], hicolor );
 190       }
 191    }
 192 }
 193
 194 void __read_rgba_pixels15( const GLcontext *ctx,
 195                            GLuint n, const GLint x[], const GLint y[],
 196                            GLubyte rgba[][4], const GLubyte mask[] )
 197 {
 198    int i,pix;
 199    for (i=0; i<n; i++,x++) {
 200     pix = __svga_getpixel15( x[i], y[i] );
 201     rgba[i][RCOMP] = ((pix>>10)<<3) & 0xff;
 202     rgba[i][GCOMP] = ((pix>> 5)<<3) & 0xff;
 203     rgba[i][BCOMP] = ((pix    )<<3) & 0xff;
 204    }
 205 }
 206
 207 #else
 208
 209
 210 /* silence compiler warning */
 211 extern void _mesa_svga15_dummy_function(void);
 212 void _mesa_svga15_dummy_function(void)
 213 {
 214 }
 215
 216
 217 #endif