src/mesa/drivers/svga/svgamesa8.c

   1 /* $Id: svgamesa8.c,v 1.10 2006/11/01 19:35:23 brianp Exp $ */
   2
   3 /*
   4  * Mesa 3-D graphics library
   5  * Version:  3.3
   6  * Copyright (C) 1995-2000  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
  37 #include "svgapix.h"
  38 #include "svgamesa8.h"
  39 #include "swrast/swrast.h"
  40
  41
  42 static void __svga_drawpixel8(int x, int y, unsigned long c)
  43 {
  44     unsigned long offset;
  45     y = SVGAInfo->height-y-1;
  46     offset = y * SVGAInfo->linewidth + x;
  47     SVGABuffer.DrawBuffer[offset]=c;
  48 }
  49
  50 static unsigned long __svga_getpixel8(int x, int y)
  51 {
  52     unsigned long offset;
  53     y = SVGAInfo->height-y-1;
  54     offset = y * SVGAInfo->linewidth + x;
  55     return SVGABuffer.ReadBuffer[offset];
  56 }
  57
  58 void __clear_index8( GLcontext *ctx, GLuint index )
  59 {
  60    SVGAMesa->clear_index = index;
  61 }
  62
  63 void __clear8( GLcontext *ctx, GLbitfield mask )
  64 {
  65    int i,j;
  66    int x = ctx->DrawBuffer->_Xmin;
  67    int y = ctx->DrawBuffer->_Ymin;
  68    int width = ctx->DrawBuffer->_Xmax - x;
  69    int height = ctx->DrawBuffer->_Ymax - y;
  70    GLboolean all = (width == ctx->DrawBuffer->Width && height == ctx->DrawBuffer->height)
  71
  72    if (mask & DD_FRONT_LEFT_BIT) {
  73       if (all) {
  74          memset(SVGABuffer.FrontBuffer, SVGAMesa->clear_index, SVGABuffer.BufferSize);
  75       }
  76       else {
  77          GLubyte *tmp = SVGABuffer.DrawBuffer;
  78          SVGABuffer.DrawBuffer = SVGABuffer.FrontBuffer;
  79          for (i=x;i<width;i++)
  80             for (j=y;j<height;j++)
  81                __svga_drawpixel8(i,j,SVGAMesa->clear_index);
  82          SVGABuffer.DrawBuffer = tmp;
  83       }
  84       mask &= ~DD_FRONT_LEFT_BIT;
  85    }
  86    if (mask & DD_BACK_LEFT_BIT) {
  87       if (all) {
  88          memset(SVGABuffer.BackBuffer, SVGAMesa->clear_index, SVGABuffer.BufferSize);
  89       }
  90       else {
  91          GLubyte *tmp = SVGABuffer.DrawBuffer;
  92          SVGABuffer.DrawBuffer = SVGABuffer.BackBuffer;
  93          for (i=x;i<width;i++)
  94             for (j=y;j<height;j++)
  95                __svga_drawpixel8(i,j,SVGAMesa->clear_index);
  96          SVGABuffer.DrawBuffer = tmp;
  97       }
  98       mask &= ~DD_BACK_LEFT_BIT;
  99    }
 100
 101    if (mask)
 102       _swrast_Clear( ctx, mask );
 103 }
 104
 105 void __write_ci32_span8( const GLcontext *ctx, struct gl_renderbuffer *rb,
 106                          GLuint n, GLint x, GLint y,
 107                          const GLuint index[], const GLubyte mask[] )
 108 {
 109    int i;
 110    for (i=0;i<n;i++,x++) {
 111       if (mask[i]) {
 112          __svga_drawpixel8( x, y, index[i]);
 113       }
 114    }
 115 }
 116
 117 void __write_ci8_span8( const GLcontext *ctx, struct gl_renderbuffer *rb,
 118                         GLuint n, GLint x, GLint y,
 119                         const GLubyte index[], const GLubyte mask[] )
 120 {
 121    int i;
 122
 123    for (i=0;i<n;i++,x++) {
 124       if (mask[i]) {
 125          __svga_drawpixel8( x, y, index[i]);
 126       }
 127    }
 128 }
 129
 130 void __write_mono_ci_span8( const GLcontext *ctx, struct gl_renderbuffer *rb,
 131                             GLuint n, GLint x, GLint y,
 132                             GLuint colorIndex, const GLubyte mask[] )
 133 {
 134    int i;
 135    for (i=0;i<n;i++,x++) {
 136       if (mask[i]) {
 137          __svga_drawpixel8( x, y, colorIndex);
 138       }
 139    }
 140 }
 141
 142 void __read_ci32_span8( const GLcontext *ctx, struct gl_renderbuffer *rb,
 143                         GLuint n, GLint x, GLint y, GLuint index[])
 144 {
 145    int i;
 146    for (i=0; i<n; i++,x++) {
 147       index[i] = __svga_getpixel8( x, y);
 148    }
 149 }
 150
 151 void __write_ci32_pixels8( const GLcontext *ctx, struct gl_renderbuffer *rb,
 152                            GLuint n, const GLint x[], const GLint y[],
 153                            const GLuint index[], const GLubyte mask[] )
 154 {
 155    int i;
 156    for (i=0; i<n; i++) {
 157       if (mask[i]) {
 158          __svga_drawpixel8( x[i], y[i], index[i]);
 159       }
 160    }
 161 }
 162
 163
 164 void __write_mono_ci_pixels8( const GLcontext *ctx, struct gl_renderbuffer *rb,
 165                               GLuint n, const GLint x[], const GLint y[],
 166                               GLuint colorIndex, const GLubyte mask[] )
 167 {
 168    int i;
 169    for (i=0; i<n; i++) {
 170       if (mask[i]) {
 171          __svga_drawpixel8( x[i], y[i], colorIndex);
 172       }
 173    }
 174 }
 175
 176 void __read_ci32_pixels8( const GLcontext *ctx, struct gl_renderbuffer *rb,
 177                           GLuint n, const GLint x[], const GLint y[],
 178                           GLuint index[], const GLubyte mask[] )
 179 {
 180    int i;
 181    for (i=0; i<n; i++,x++) {
 182       index[i] = __svga_getpixel8( x[i], y[i]);
 183    }
 184 }
 185
 186
 187 #else
 188
 189
 190 /* silence compiler warning */
 191 extern void _mesa_svga8_dummy_function(void);
 192 void _mesa_svga8_dummy_function(void)
 193 {
 194 }
 195
 196
 197 #endif