src/mesa/drivers/svga/svgamesa15.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 "svgamesa15.h"
  37 #include "swrast/swrast.h"
  38
  39
  40 static void __svga_drawpixel15(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_getpixel15(int x, int y)
  50 {
  51     unsigned long offset;
  52     GLshort *shortBuffer=(void *)SVGABuffer.ReadBuffer;
  53     y = SVGAInfo->height-y-1;
  54     offset = y * SVGAInfo->width + x;
  55     return shortBuffer[offset];
  56 }
  57
  58 void __clear_color15( GLcontext *ctx, const GLfloat color[4] )
  59 {
  60    GLubyte col[3];
  61    CLAMPED_FLOAT_TO_UBYTE(col[0], color[0]);
  62    CLAMPED_FLOAT_TO_UBYTE(col[1], color[1]);
  63    CLAMPED_FLOAT_TO_UBYTE(col[2], color[2]);
  64    SVGAMesa->clear_hicolor=(col[0]>>3)<<10 | (col[1]>>3)<<5 | (col[2]>>3);
  65 /*   SVGAMesa->clear_hicolor=(red)<<10 | (green)<<5 | (blue);*/
  66 }
  67
  68 void __clear15( GLcontext *ctx, GLbitfield mask )
  69 {
  70    int i, j;
  71    int x = ctx->DrawBuffer->_Xmin;
  72    int y = ctx->DrawBuffer->_Ymin;
  73    int width = ctx->DrawBuffer->_Xmax - x;
  74    int height = ctx->DrawBuffer->_Ymax - y;
  75    GLboolean all = (width == ctx->DrawBuffer->Width && height == ctx->DrawBuffer->height)
  76
  77    if (mask & DD_FRONT_LEFT_BIT) {
  78       GLshort *shortBuffer=(void *)SVGABuffer.FrontBuffer;
  79       if (all) {
  80          for (i=0;i<SVGABuffer.BufferSize / 2;i++)
  81             shortBuffer[i]=SVGAMesa->clear_hicolor;
  82       }
  83       else {
  84          GLubyte *tmp = SVGABuffer.DrawBuffer;
  85          SVGABuffer.DrawBuffer = SVGABuffer.FrontBuffer;
  86          for (i=x;i<width;i++)
  87             for (j=y;j<height;j++)
  88                __svga_drawpixel15(i,j,SVGAMesa->clear_hicolor);
  89          SVGABuffer.DrawBuffer = tmp;
  90       }
  91       mask &= ~DD_FRONT_LEFT_BIT;
  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       mask &= ~DD_BACK_LEFT_BIT;
 108    }
 109
 110    if (mask)
 111       _swrast_Clear( ctx, mask );
 112 }
 113
 114 void __write_rgba_span15( const GLcontext *ctx, GLuint n, GLint x, GLint y,
 115                           const GLubyte rgba[][4], const GLubyte mask[] )
 116 {
 117    int i;
 118    if (mask) {
 119       /* draw some pixels */
 120       for (i=0; i<n; i++, x++) {
 121          if (mask[i]) {
 122          __svga_drawpixel15( x, y, (rgba[i][RCOMP]>>3)<<10 | \
 123                                    (rgba[i][GCOMP]>>3)<<5 |  \
 124                                    (rgba[i][BCOMP]>>3));
 125          }
 126       }
 127    }
 128    else {
 129       /* draw all pixels */
 130       for (i=0; i<n; i++, x++) {
 131          __svga_drawpixel15( x, y, (rgba[i][RCOMP]>>3)<<10 | \
 132                                    (rgba[i][GCOMP]>>3)<<5  | \
 133                                    (rgba[i][BCOMP]>>3));
 134       }
 135    }
 136 }
 137
 138 void __write_mono_rgba_span15( const GLcontext *ctx,
 139                                GLuint n, GLint x, GLint y,
 140                                const GLchan color[4], const GLubyte mask[])
 141 {
 142    GLushort hicolor = (color[RCOMP] >> 3) << 10 |
 143                       (color[GCOMP] >> 3) << 5 |
 144                       (color[BCOMP] >> 3);
 145    int i;
 146    for (i=0; i<n; i++, x++) {
 147       if (mask[i]) {
 148          __svga_drawpixel15( x, y, hicolor);
 149       }
 150    }
 151 }
 152
 153 void __read_rgba_span15( const GLcontext *ctx, GLuint n, GLint x, GLint y,
 154                          GLubyte rgba[][4] )
 155 {
 156    int i,pix;
 157    for (i=0; i<n; i++, x++) {
 158     pix = __svga_getpixel15( x, y);
 159     rgba[i][RCOMP] = ((pix>>10)<<3) & 0xff;
 160     rgba[i][GCOMP] = ((pix>> 5)<<3) & 0xff;
 161     rgba[i][BCOMP] = ((pix    )<<3) & 0xff;
 162    }
 163 }
 164
 165 void __write_rgba_pixels15( const GLcontext *ctx,
 166                             GLuint n, const GLint x[], const GLint y[],
 167                             const GLubyte rgba[][4], const GLubyte mask[] )
 168 {
 169    int i;
 170    for (i=0; i<n; i++) {
 171       if (mask[i]) {
 172          __svga_drawpixel15( x[i], y[i], (rgba[i][RCOMP]>>3)<<10 | \
 173                                          (rgba[i][GCOMP]>>3)<<5  | \
 174                                          (rgba[i][BCOMP]>>3));
 175       }
 176    }
 177 }
 178
 179
 180 void __write_mono_rgba_pixels15( const GLcontext *ctx,
 181                                  GLuint n,
 182                                  const GLint x[], const GLint y[],
 183                                  const GLchan color[4], const GLubyte mask[] )
 184 {
 185    GLushort hicolor = (color[RCOMP] >> 3) << 10 |
 186                       (color[GCOMP] >> 3) << 5 |
 187                       (color[BCOMP] >> 3);
 188    int i;
 189    /* use current rgb color */
 190    for (i=0; i<n; i++) {
 191       if (mask[i]) {
 192          __svga_drawpixel15( x[i], y[i], hicolor );
 193       }
 194    }
 195 }
 196
 197 void __read_rgba_pixels15( const GLcontext *ctx,
 198                            GLuint n, const GLint x[], const GLint y[],
 199                            GLubyte rgba[][4], const GLubyte mask[] )
 200 {
 201    int i,pix;
 202    for (i=0; i<n; i++,x++) {
 203     pix = __svga_getpixel15( x[i], y[i] );
 204     rgba[i][RCOMP] = ((pix>>10)<<3) & 0xff;
 205     rgba[i][GCOMP] = ((pix>> 5)<<3) & 0xff;
 206     rgba[i][BCOMP] = ((pix    )<<3) & 0xff;
 207    }
 208 }
 209
 210 #else
 211
 212
 213 /* silence compiler warning */
 214 extern void _mesa_svga15_dummy_function(void);
 215 void _mesa_svga15_dummy_function(void)
 216 {
 217 }
 218
 219
 220 #endif