src/mesa/drivers/svga/svgamesa16.c

   1
   2 /*
   3  * Mesa 3-D graphics library
   4  * Version:  5.0
   5  * Copyright (C) 1995-2002  Brian Paul
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Library General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Library General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Library General Public
  18  * License along with this library; if not, write to the Free
  19  * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20  */
  21
  22
  23 /*
  24  * SVGA driver for Mesa.
  25  * Original author:  Brian Paul
  26  * Additional authors:  Slawomir Szczyrba <steev@hot.pl>  (Mesa 3.2)
  27  */
  28
  29 #ifdef HAVE_CONFIG_H
  30 #include "conf.h"
  31 #endif
  32
  33 #ifdef SVGA
  34
  35 #include "svgapix.h"
  36 #include "svgamesa16.h"
  37 #include "swrast/swrast.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 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) << 11 |
  66                               (col[1] >> 2) << 5 |
  67                               (col[2] >> 3);
  68 /*    SVGAMesa->clear_hicolor=(red)<<11 | (green)<<5 | (blue); */
  69 }
  70
  71 void __clear16( GLcontext *ctx, GLbitfield mask )
  72 {
  73    int i,j;
  74    int x = ctx->DrawBuffer->_Xmin;
  75    int y = ctx->DrawBuffer->_Ymin;
  76    int width = ctx->DrawBuffer->_Xmax - x;
  77    int height = ctx->DrawBuffer->_Ymax - y;
  78    GLboolean all = (width == ctx->DrawBuffer->Width && height == ctx->DrawBuffer->height)
  79
  80    if (mask & DD_FRONT_LEFT_BIT) {
  81       if (all) {
  82          GLshort *shortBuffer=(void *)SVGABuffer.FrontBuffer;
  83          for (i=0;i<SVGABuffer.BufferSize / 2;i++)
  84             shortBuffer[i]=SVGAMesa->clear_hicolor;
  85       }
  86       else {
  87          GLubyte *tmp = SVGABuffer.DrawBuffer;
  88          SVGABuffer.DrawBuffer = SVGABuffer.FrontBuffer;
  89          for (i=x;i<width;i++)
  90             for (j=y;j<height;j++)
  91                __svga_drawpixel16(i,j,SVGAMesa->clear_hicolor);
  92          SVGABuffer.DrawBuffer = tmp;
  93       }
  94       mask &= ~DD_FRONT_LEFT_BIT;
  95    }
  96    if (mask & DD_BACK_LEFT_BIT) {
  97       if (all) {
  98          GLshort *shortBuffer=(void *)SVGABuffer.BackBuffer;
  99          for (i=0;i<SVGABuffer.BufferSize / 2;i++)
 100             shortBuffer[i]=SVGAMesa->clear_hicolor;
 101       }
 102       else {
 103          GLubyte *tmp = SVGABuffer.DrawBuffer;
 104          SVGABuffer.DrawBuffer = SVGABuffer.BackBuffer;
 105          for (i=x;i<width;i++)
 106             for (j=y;j<height;j++)
 107                __svga_drawpixel16(i,j,SVGAMesa->clear_hicolor);
 108          SVGABuffer.DrawBuffer = tmp;
 109       }
 110       mask &= ~DD_BACK_LEFT_BIT;
 111    }
 112
 113    if (mask)
 114       _swrast_Clear( ctx, mask );
 115 }
 116
 117 void __write_rgba_span16( const GLcontext *ctx, GLuint n, GLint x, GLint y,
 118                           const GLubyte rgba[][4], const GLubyte mask[] )
 119 {
 120    int i;
 121    if (mask) {
 122       /* draw some pixels */
 123       for (i=0; i<n; i++, x++) {
 124          if (mask[i]) {
 125          __svga_drawpixel16( x, y, (rgba[i][RCOMP]>>3)<<11 | \
 126                                    (rgba[i][GCOMP]>>2)<<5  | \
 127                                    (rgba[i][BCOMP]>>3));
 128          }
 129       }
 130    }
 131    else {
 132       /* draw all pixels */
 133       for (i=0; i<n; i++, x++) {
 134          __svga_drawpixel16( x, y, (rgba[i][RCOMP]>>3)<<11 | \
 135                                    (rgba[i][GCOMP]>>2)<<5  | \
 136                                    (rgba[i][BCOMP]>>3));
 137       }
 138    }
 139 }
 140
 141 void __write_mono_rgba_span16( const GLcontext *ctx,
 142                                GLuint n, GLint x, GLint y,
 143                                const GLchan color[4], const GLubyte mask[])
 144 {
 145    GLushort hicolor=(color[RCOMP]>>3)<<11 | (color[GCOMP]>>2)<<5 | (color[BCOMP]>>3);
 146    int i;
 147    for (i=0; i<n; i++, x++) {
 148       if (mask[i]) {
 149          __svga_drawpixel16( x, y, hicolor);
 150       }
 151    }
 152 }
 153
 154 void __read_rgba_span16( const GLcontext *ctx, GLuint n, GLint x, GLint y,
 155                          GLubyte rgba[][4] )
 156 {
 157    int i,pix;
 158    for (i=0; i<n; i++, x++) {
 159     pix = __svga_getpixel16( x, y );
 160     rgba[i][RCOMP] = ((pix>>11)<<3) & 0xff;
 161     rgba[i][GCOMP] = ((pix>> 5)<<2) & 0xff;
 162     rgba[i][BCOMP] = ((pix    )<<3) & 0xff;
 163    }
 164 }
 165
 166 void __write_rgba_pixels16( const GLcontext *ctx,
 167                             GLuint n, const GLint x[], const GLint y[],
 168                             const GLubyte rgba[][4], const GLubyte mask[] )
 169 {
 170    int i;
 171    for (i=0; i<n; i++) {
 172       if (mask[i]) {
 173          __svga_drawpixel16( x[i], y[i], (rgba[i][RCOMP]>>3)<<11 | \
 174                                          (rgba[i][GCOMP]>>2)<<5  | \
 175                                          (rgba[i][BCOMP]>>3));
 176       }
 177    }
 178 }
 179
 180
 181 void __write_mono_rgba_pixels16( const GLcontext *ctx,
 182                                  GLuint n,
 183                                  const GLint x[], const GLint y[],
 184                                  const GLchan color[4], const GLubyte mask[] )
 185 {
 186    GLushort hicolor=(color[RCOMP]>>3)<<11 | (color[GCOMP]>>2)<<5 | (color[BCOMP]>>3);
 187    int i;
 188    for (i=0; i<n; i++) {
 189       if (mask[i]) {
 190          __svga_drawpixel16( x[i], y[i], hicolor );
 191       }
 192    }
 193 }
 194
 195 void __read_rgba_pixels16( const GLcontext *ctx,
 196                            GLuint n, const GLint x[], const GLint y[],
 197                            GLubyte rgba[][4], const GLubyte mask[] )
 198 {
 199    int i,pix;
 200    for (i=0; i<n; i++,x++) {
 201     pix = __svga_getpixel16( x[i], y[i] );
 202     rgba[i][RCOMP] = ((pix>>11)<<3) & 0xff;
 203     rgba[i][GCOMP] = ((pix>> 5)<<2) & 0xff;
 204     rgba[i][BCOMP] = ((pix    )<<3) & 0xff;
 205    }
 206 }
 207
 208 #else
 209
 210
 211 /* silence compiler warning */
 212 extern void _mesa_svga16_dummy_function(void);
 213 void _mesa_svga16_dummy_function(void)
 214 {
 215 }
 216
 217
 218 #endif