src/mesa/drivers/svga/svgamesa15.c

   1 /* $Id: svgamesa15.c,v 1.12 2006/11/01 19:35:23 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 )
  70 {
  71    int i, j;
  72    int x = ctx->DrawBuffer->_Xmin;
  73    int y = ctx->DrawBuffer->_Ymin;
  74    int width = ctx->DrawBuffer->_Xmax - x;
  75    int height = ctx->DrawBuffer->_Ymax - y;
  76    GLboolean all = (width == ctx->DrawBuffer->Width && height == ctx->DrawBuffer->height)
  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       mask &= ~DD_FRONT_LEFT_BIT;
  93    }
  94    if (mask & DD_BACK_LEFT_BIT) {
  95       GLshort *shortBuffer=(void *)SVGABuffer.BackBuffer;
  96       if (all) {
  97          for (i=0;i<SVGABuffer.BufferSize / 2;i++)
  98             shortBuffer[i]=SVGAMesa->clear_hicolor;
  99       }
 100       else {
 101          GLubyte *tmp = SVGABuffer.DrawBuffer;
 102          SVGABuffer.DrawBuffer = SVGABuffer.BackBuffer;
 103          for (i=x;i<width;i++)
 104             for (j=y;j<height;j++)
 105                __svga_drawpixel15(i,j,SVGAMesa->clear_hicolor);
 106          SVGABuffer.DrawBuffer = tmp;
 107       }
 108       mask &= ~DD_BACK_LEFT_BIT;
 109    }
 110
 111    if (mask)
 112       _swrast_Clear( ctx, mask );
 113 }
 114
 115 void __write_rgba_span15( const GLcontext *ctx, GLuint n, GLint x, GLint y,
 116                           const GLubyte rgba[][4], const GLubyte mask[] )
 117 {
 118    int i;
 119    if (mask) {
 120       /* draw some pixels */
 121       for (i=0; i<n; i++, x++) {
 122          if (mask[i]) {
 123          __svga_drawpixel15( x, y, (rgba[i][RCOMP]>>3)<<10 | \
 124                                    (rgba[i][GCOMP]>>3)<<5 |  \
 125                                    (rgba[i][BCOMP]>>3));
 126          }
 127       }
 128    }
 129    else {
 130       /* draw all pixels */
 131       for (i=0; i<n; i++, x++) {
 132          __svga_drawpixel15( x, y, (rgba[i][RCOMP]>>3)<<10 | \
 133                                    (rgba[i][GCOMP]>>3)<<5  | \
 134                                    (rgba[i][BCOMP]>>3));
 135       }
 136    }
 137 }
 138
 139 void __write_mono_rgba_span15( const GLcontext *ctx,
 140                                GLuint n, GLint x, GLint y,
 141                                const GLchan color[4], const GLubyte mask[])
 142 {
 143    GLushort hicolor = (color[RCOMP] >> 3) << 10 |
 144                       (color[GCOMP] >> 3) << 5 |
 145                       (color[BCOMP] >> 3);
 146    int i;
 147    for (i=0; i<n; i++, x++) {
 148       if (mask[i]) {
 149          __svga_drawpixel15( x, y, hicolor);
 150       }
 151    }
 152 }
 153
 154 void __read_rgba_span15( 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_getpixel15( x, y);
 160     rgba[i][RCOMP] = ((pix>>10)<<3) & 0xff;
 161     rgba[i][GCOMP] = ((pix>> 5)<<3) & 0xff;
 162     rgba[i][BCOMP] = ((pix    )<<3) & 0xff;
 163    }
 164 }
 165
 166 void __write_rgba_pixels15( 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_drawpixel15( x[i], y[i], (rgba[i][RCOMP]>>3)<<10 | \
 174                                          (rgba[i][GCOMP]>>3)<<5  | \
 175                                          (rgba[i][BCOMP]>>3));
 176       }
 177    }
 178 }
 179
 180
 181 void __write_mono_rgba_pixels15( 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) << 10 |
 187                       (color[GCOMP] >> 3) << 5 |
 188                       (color[BCOMP] >> 3);
 189    int i;
 190    /* use current rgb color */
 191    for (i=0; i<n; i++) {
 192       if (mask[i]) {
 193          __svga_drawpixel15( x[i], y[i], hicolor );
 194       }
 195    }
 196 }
 197
 198 void __read_rgba_pixels15( const GLcontext *ctx,
 199                            GLuint n, const GLint x[], const GLint y[],
 200                            GLubyte rgba[][4], const GLubyte mask[] )
 201 {
 202    int i,pix;
 203    for (i=0; i<n; i++,x++) {
 204     pix = __svga_getpixel15( x[i], y[i] );
 205     rgba[i][RCOMP] = ((pix>>10)<<3) & 0xff;
 206     rgba[i][GCOMP] = ((pix>> 5)<<3) & 0xff;
 207     rgba[i][BCOMP] = ((pix    )<<3) & 0xff;
 208    }
 209 }
 210
 211 #else
 212
 213
 214 /* silence compiler warning */
 215 extern void _mesa_svga15_dummy_function(void);
 216 void _mesa_svga15_dummy_function(void)
 217 {
 218 }
 219
 220
 221 #endif