dll/opengl/mesa/masking.c

   1 /* $Id: masking.c,v 1.5 1997/07/24 01:23:16 brianp Exp $ */
   2
   3 /*
   4  * Mesa 3-D graphics library
   5  * Version:  2.4
   6  * Copyright (C) 1995-1997  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  * $Log: masking.c,v $
  26  * Revision 1.5  1997/07/24 01:23:16  brianp
  27  * changed precompiled header symbol from PCH to PC_HEADER
  28  *
  29  * Revision 1.4  1997/05/28 03:25:43  brianp
  30  * added precompiled header (PCH) support
  31  *
  32  * Revision 1.3  1996/11/06 04:19:40  brianp
  33  * now call gl_read_color/index_span() instead of device driver function
  34  *
  35  * Revision 1.2  1996/10/25 00:07:46  brianp
  36  * changed MAX_WIDTH to PB_SIZE in gl_mask_index_pixels()
  37  *
  38  * Revision 1.1  1996/09/13 01:38:16  brianp
  39  * Initial revision
  40  *
  41  */
  42
  43
  44 /*
  45  * Implement the effect of glColorMask and glIndexMask in software.
  46  */
  47
  48
  49 #ifdef PC_HEADER
  50 #include "all.h"
  51 #else
  52 #include <string.h>
  53 #include "alphabuf.h"
  54 #include "context.h"
  55 #include "macros.h"
  56 #include "masking.h"
  57 #include "pb.h"
  58 #include "span.h"
  59 #include "types.h"
  60 #endif
  61
  62
  63
  64 void gl_IndexMask( GLcontext *ctx, GLuint mask )
  65 {
  66    if (INSIDE_BEGIN_END(ctx)) {
  67       gl_error( ctx, GL_INVALID_OPERATION, "glIndexMask" );
  68       return;
  69    }
  70    ctx->Color.IndexMask = mask;
  71    ctx->NewState |= NEW_RASTER_OPS;
  72 }
  73
  74
  75
  76 void gl_ColorMask( GLcontext *ctx, GLboolean red, GLboolean green,
  77                    GLboolean blue, GLboolean alpha )
  78 {
  79    if (INSIDE_BEGIN_END(ctx)) {
  80       gl_error( ctx, GL_INVALID_OPERATION, "glColorMask" );
  81       return;
  82    }
  83    ctx->Color.ColorMask = (red << 3) | (green << 2) | (blue << 1) | alpha;
  84    ctx->NewState |= NEW_RASTER_OPS;
  85 }
  86
  87
  88
  89
  90 /*
  91  * Apply glColorMask to a span of RGBA pixels.
  92  */
  93 void gl_mask_color_span( GLcontext *ctx,
  94                          GLuint n, GLint x, GLint y,
  95                          GLubyte red[], GLubyte green[],
  96                          GLubyte blue[], GLubyte alpha[] )
  97 {
  98    GLubyte r[MAX_WIDTH], g[MAX_WIDTH], b[MAX_WIDTH], a[MAX_WIDTH];
  99
 100    gl_read_color_span( ctx, n, x, y, r, g, b, a );
 101
 102    if ((ctx->Color.ColorMask & 8) == 0) {
 103       /* replace source reds with frame buffer reds */
 104       MEMCPY( red, r, n );
 105    }
 106    if ((ctx->Color.ColorMask & 4) == 0) {
 107       /* replace source greens with frame buffer greens */
 108       MEMCPY( green, g, n );
 109    }
 110    if ((ctx->Color.ColorMask & 2) == 0) {
 111       /* replace source blues with frame buffer blues */
 112       MEMCPY( blue, b, n );
 113    }
 114    if ((ctx->Color.ColorMask & 1) == 0) {
 115       /* replace source alphas with frame buffer alphas */
 116       MEMCPY( alpha, a, n );
 117    }
 118 }
 119
 120
 121
 122 /*
 123  * Apply glColorMask to an array of RGBA pixels.
 124  */
 125 void gl_mask_color_pixels( GLcontext *ctx,
 126                            GLuint n, const GLint x[], const GLint y[],
 127                            GLubyte red[], GLubyte green[],
 128                            GLubyte blue[], GLubyte alpha[],
 129                            const GLubyte mask[] )
 130 {
 131    GLubyte r[PB_SIZE], g[PB_SIZE], b[PB_SIZE], a[PB_SIZE];
 132
 133    (*ctx->Driver.ReadColorPixels)( ctx, n, x, y, r, g, b, a, mask );
 134    if (ctx->RasterMask & ALPHABUF_BIT) {
 135       gl_read_alpha_pixels( ctx, n, x, y, a, mask );
 136    }
 137
 138    if ((ctx->Color.ColorMask & 8) == 0) {
 139       /* replace source reds with frame buffer reds */
 140       MEMCPY( red, r, n );
 141    }
 142    if ((ctx->Color.ColorMask & 4) == 0) {
 143       /* replace source greens with frame buffer greens */
 144       MEMCPY( green, g, n );
 145    }
 146    if ((ctx->Color.ColorMask & 2) == 0) {
 147       /* replace source blues with frame buffer blues */
 148       MEMCPY( blue, b, n );
 149    }
 150    if ((ctx->Color.ColorMask & 1) == 0) {
 151       /* replace source alphas with frame buffer alphas */
 152       MEMCPY( alpha, a, n );
 153    }
 154 }
 155
 156
 157
 158 /*
 159  * Apply glIndexMask to a span of CI pixels.
 160  */
 161 void gl_mask_index_span( GLcontext *ctx,
 162                          GLuint n, GLint x, GLint y, GLuint index[] )
 163 {
 164    GLuint i;
 165    GLuint fbindexes[MAX_WIDTH];
 166    GLuint msrc, mdest;
 167
 168    gl_read_index_span( ctx, n, x, y, fbindexes );
 169
 170    msrc = ctx->Color.IndexMask;
 171    mdest = ~msrc;
 172
 173    for (i=0;i<n;i++) {
 174       index[i] = (index[i] & msrc) | (fbindexes[i] & mdest);
 175    }
 176 }
 177
 178
 179
 180 /*
 181  * Apply glIndexMask to an array of CI pixels.
 182  */
 183 void gl_mask_index_pixels( GLcontext *ctx,
 184                            GLuint n, const GLint x[], const GLint y[],
 185                            GLuint index[], const GLubyte mask[] )
 186 {
 187    GLuint i;
 188    GLuint fbindexes[PB_SIZE];
 189    GLuint msrc, mdest;
 190
 191    (*ctx->Driver.ReadIndexPixels)( ctx, n, x, y, fbindexes, mask );
 192
 193    msrc = ctx->Color.IndexMask;
 194    mdest = ~msrc;
 195
 196    for (i=0;i<n;i++) {
 197       index[i] = (index[i] & msrc) | (fbindexes[i] & mdest);
 198    }
 199 }
 200