src/mesa/drivers/svga/svgamesa16.c

   1 /* $Id: svgamesa16.c,v 1.11.36.1 2006/11/02 12:02:17 alanh 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 "svgamesa16.h"
  38 #include "swrast/swrast.h"
  39
  40
  41 static void __svga_drawpixel16(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_getpixel16(int x, int y)
  51 {
  52     unsigned long offset;
  53
  54     GLshort *shortBuffer=(void *)SVGABuffer.ReadBuffer;
  55     y = SVGAInfo->height-y-1;
  56     offset = y * SVGAInfo->width + x;
  57     return shortBuffer[offset];
  58 }
  59
  60 void __clear_color16( GLcontext *ctx, const GLfloat color[4] )
  61 {
  62    GLubyte col[3];
  63    CLAMPED_FLOAT_TO_UBYTE(col[0], color[0]);
  64    CLAMPED_FLOAT_TO_UBYTE(col[1], color[1]);
  65    CLAMPED_FLOAT_TO_UBYTE(col[2], color[2]);
  66    SVGAMesa->clear_hicolor = (col[0] >> 3) << 11 |
  67                               (col[1] >> 2) << 5 |
  68                               (col[2] >> 3);
  69 /*    SVGAMesa->clear_hicolor=(red)<<11 | (green)<<5 | (blue); */
  70 }
  71
  72 void __clear16( GLcontext *ctx, GLbitfield mask )
  73 {
  74    int i,j;
  75    int x = ctx->DrawBuffer->_Xmin;
  76    int y = ctx->DrawBuffer->_Ymin;
  77    int width = ctx->DrawBuffer->_Xmax - x;
  78    int height = ctx->DrawBuffer->_Ymax - y;
  79    GLboolean all = (width == ctx->DrawBuffer->Width && height == ctx->DrawBuffer->height)
  80
  81    if (mask & DD_FRONT_LEFT_BIT) {
  82       if (all) {
  83          GLshort *shortBuffer=(void *)SVGABuffer.FrontBuffer;
  84          for (i=0;i<SVGABuffer.BufferSize / 2;i++)
  85             shortBuffer[i]=SVGAMesa->clear_hicolor;
  86       }
  87       else {
  88          GLubyte *tmp = SVGABuffer.DrawBuffer;
  89          SVGABuffer.DrawBuffer = SVGABuffer.FrontBuffer;
  90          for (i=x;i<width;i++)
  91             for (j=y;j<height;j++)
  92                __svga_drawpixel16(i,j,SVGAMesa->clear_hicolor);
  93          SVGABuffer.DrawBuffer = tmp;
  94       }
  95       mask &= ~DD_FRONT_LEFT_BIT;
  96    }
  97    if (mask & DD_BACK_LEFT_BIT) {
  98       if (all) {
  99          GLshort *shortBuffer=(void *)SVGABuffer.BackBuffer;
 100          for (i=0;i<SVGABuffer.BufferSize / 2;i++)
 101             shortBuffer[i]=SVGAMesa->clear_hicolor;
 102       }
 103       else {
 104          GLubyte *tmp = SVGABuffer.DrawBuffer;
 105          SVGABuffer.DrawBuffer = SVGABuffer.BackBuffer;
 106          for (i=x;i<width;i++)
 107             for (j=y;j<height;j++)
 108                __svga_drawpixel16(i,j,SVGAMesa->clear_hicolor);
 109          SVGABuffer.DrawBuffer = tmp;
 110       }
 111       mask &= ~DD_BACK_LEFT_BIT;
 112    }
 113
 114    if (mask)
 115       _swrast_Clear( ctx, mask );
 116 }
 117
 118 void __write_rgba_span16( const GLcontext *ctx, GLuint n, GLint x, GLint y,
 119                           const GLubyte rgba[][4], const GLubyte mask[] )
 120 {
 121    int i;
 122    if (mask) {
 123       /* draw some pixels */
 124       for (i=0; i<n; i++, x++) {
 125          if (mask[i]) {
 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    else {
 133       /* draw all pixels */
 134       for (i=0; i<n; i++, x++) {
 135          __svga_drawpixel16( x, y, (rgba[i][RCOMP]>>3)<<11 | \
 136                                    (rgba[i][GCOMP]>>2)<<5  | \
 137                                    (rgba[i][BCOMP]>>3));
 138       }
 139    }
 140 }
 141
 142 void __write_mono_rgba_span16( const GLcontext *ctx,
 143                                GLuint n, GLint x, GLint y,
 144                                const GLchan color[4], const GLubyte mask[])
 145 {
 146    GLushort hicolor=(color[RCOMP]>>3)<<11 | (color[GCOMP]>>2)<<5 | (color[BCOMP]>>3);
 147    int i;
 148    for (i=0; i<n; i++, x++) {
 149       if (mask[i]) {
 150          __svga_drawpixel16( x, y, hicolor);
 151       }
 152    }
 153 }
 154
 155 void __read_rgba_span16( const GLcontext *ctx, GLuint n, GLint x, GLint y,
 156                          GLubyte rgba[][4] )
 157 {
 158    int i,pix;
 159    for (i=0; i<n; i++, x++) {
 160     pix = __svga_getpixel16( x, y );
 161     rgba[i][RCOMP] = ((pix>>11)<<3) & 0xff;
 162     rgba[i][GCOMP] = ((pix>> 5)<<2) & 0xff;
 163     rgba[i][BCOMP] = ((pix    )<<3) & 0xff;
 164    }
 165 }
 166
 167 void __write_rgba_pixels16( const GLcontext *ctx,
 168                             GLuint n, const GLint x[], const GLint y[],
 169                             const GLubyte rgba[][4], const GLubyte mask[] )
 170 {
 171    int i;
 172    for (i=0; i<n; i++) {
 173       if (mask[i]) {
 174          __svga_drawpixel16( x[i], y[i], (rgba[i][RCOMP]>>3)<<11 | \
 175                                          (rgba[i][GCOMP]>>2)<<5  | \
 176                                          (rgba[i][BCOMP]>>3));
 177       }
 178    }
 179 }
 180
 181
 182 void __write_mono_rgba_pixels16( const GLcontext *ctx,
 183                                  GLuint n,
 184                                  const GLint x[], const GLint y[],
 185                                  const GLchan color[4], const GLubyte mask[] )
 186 {
 187    GLushort hicolor=(color[RCOMP]>>3)<<11 | (color[GCOMP]>>2)<<5 | (color[BCOMP]>>3);
 188    int i;
 189    for (i=0; i<n; i++) {
 190       if (mask[i]) {
 191          __svga_drawpixel16( x[i], y[i], hicolor );
 192       }
 193    }
 194 }
 195
 196 void __read_rgba_pixels16( const GLcontext *ctx,
 197                            GLuint n, const GLint x[], const GLint y[],
 198                            GLubyte rgba[][4], const GLubyte mask[] )
 199 {
 200    int i,pix;
 201    for (i=0; i<n; i++,x++) {
 202     pix = __svga_getpixel16( x[i], y[i] );
 203     rgba[i][RCOMP] = ((pix>>11)<<3) & 0xff;
 204     rgba[i][GCOMP] = ((pix>> 5)<<2) & 0xff;
 205     rgba[i][BCOMP] = ((pix    )<<3) & 0xff;
 206    }
 207 }
 208
 209 #else
 210
 211
 212 /* silence compiler warning */
 213 extern void _mesa_svga16_dummy_function(void);
 214 void _mesa_svga16_dummy_function(void)
 215 {
 216 }
 217
 218
 219 #endif