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masking.c
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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 
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 
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  */
94  GLuint n, GLint x, GLint y,
95  GLubyte red[], GLubyte green[],
96  GLubyte blue[], GLubyte alpha[] )
97 {
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  */
126  GLuint n, const GLint x[], const GLint y[],
127  GLubyte red[], GLubyte green[],
128  GLubyte blue[], GLubyte alpha[],
129  const GLubyte mask[] )
130 {
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  */
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  */
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 
GLuint NewState
Definition: types.h:1355
void gl_mask_color_span(GLcontext *ctx, GLuint n, GLint x, GLint y, GLubyte red[], GLubyte green[], GLubyte blue[], GLubyte alpha[])
Definition: masking.c:93
unsigned char GLubyte
Definition: gl.h:157
GLdouble GLdouble GLdouble r
Definition: gl.h:2055
void gl_mask_index_pixels(GLcontext *ctx, GLuint n, const GLint x[], const GLint y[], GLuint index[], const GLubyte mask[])
Definition: masking.c:183
GLdouble n
Definition: glext.h:7729
GLint GLint GLint GLint GLint x
Definition: gl.h:1548
#define INSIDE_BEGIN_END(CTX)
Definition: macros.h:135
GLuint RasterMask
Definition: types.h:1361
struct dd_function_table Driver
Definition: types.h:1276
GLsizei GLenum const GLvoid GLsizei GLenum GLbyte GLbyte GLbyte GLdouble GLdouble GLdouble GLfloat GLfloat GLfloat GLint GLint GLint GLshort GLshort GLshort GLubyte GLubyte GLubyte GLuint GLuint GLuint GLushort GLushort GLushort GLbyte GLbyte GLbyte GLbyte GLdouble GLdouble GLdouble GLdouble GLfloat GLfloat GLfloat GLfloat GLint GLint GLint GLint GLshort GLshort GLshort GLshort GLubyte GLubyte GLubyte GLubyte GLuint GLuint GLuint GLuint GLushort GLushort GLushort GLushort GLboolean const GLdouble const GLfloat const GLint const GLshort const GLbyte const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLdouble const GLfloat const GLfloat const GLint const GLint const GLshort const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort GLenum GLenum GLenum GLfloat GLenum GLint GLenum GLenum GLenum GLfloat GLenum GLenum GLint GLenum GLfloat GLenum GLint GLint GLushort GLenum GLenum GLfloat GLenum GLenum GLint GLfloat const GLubyte GLenum GLenum GLenum const GLfloat GLenum GLenum const GLint GLenum GLint GLint GLsizei GLsizei GLint GLenum GLenum const GLvoid GLenum GLenum const GLfloat GLenum GLenum const GLint GLenum GLenum const GLdouble GLenum GLenum const GLfloat GLenum GLenum const GLint GLsizei GLuint GLfloat GLuint GLbitfield GLfloat GLint GLuint GLboolean GLenum GLfloat GLenum GLbitfield GLenum GLfloat GLfloat GLint GLint const GLfloat GLenum GLfloat GLfloat GLint GLint GLfloat GLfloat GLint GLint const GLfloat GLint GLfloat GLfloat GLint GLfloat GLfloat GLint GLfloat GLfloat const GLdouble const GLfloat const GLdouble const GLfloat GLint i
Definition: glfuncs.h:248
GLenum GLint GLuint mask
Definition: glext.h:6028
unsigned char GLboolean
Definition: gl.h:151
void gl_read_index_span(GLcontext *ctx, GLuint n, GLint x, GLint y, GLuint indx[])
Definition: span.c:897
void gl_read_color_span(GLcontext *ctx, GLuint n, GLint x, GLint y, GLubyte red[], GLubyte green[], GLubyte blue[], GLubyte alpha[])
Definition: span.c:850
GLuint index
Definition: glext.h:6031
struct gl_colorbuffer_attrib Color
Definition: types.h:1319
void gl_IndexMask(GLcontext *ctx, GLuint mask)
Definition: masking.c:64
GLclampf GLclampf blue
Definition: gl.h:1740
GLboolean GLboolean g
Definition: glext.h:6204
GLboolean GLboolean GLboolean b
Definition: glext.h:6204
#define ALPHABUF_BIT
Definition: types.h:1223
void gl_read_alpha_pixels(GLcontext *ctx, GLuint n, const GLint x[], const GLint y[], GLubyte alpha[], const GLubyte mask[])
Definition: alphabuf.c:257
#define MAX_WIDTH
Definition: config.h:130
#define MEMCPY(DST, SRC, BYTES)
Definition: macros.h:231
GLclampf green
Definition: gl.h:1740
#define red
Definition: linetest.c:67
#define GL_INVALID_OPERATION
Definition: gl.h:696
void gl_ColorMask(GLcontext *ctx, GLboolean red, GLboolean green, GLboolean blue, GLboolean alpha)
Definition: masking.c:76
#define NEW_RASTER_OPS
Definition: types.h:1233
void gl_error(GLcontext *ctx, GLenum error, const char *s)
Definition: context.c:1421
unsigned int GLuint
Definition: gl.h:159
GLint GLint GLint GLint GLint GLint y
Definition: gl.h:1548
GLclampf GLclampf GLclampf alpha
Definition: gl.h:1740
int GLint
Definition: gl.h:156
GLboolean GLboolean GLboolean GLboolean a
Definition: glext.h:6204
#define PB_SIZE
Definition: pb.h:52
void gl_mask_color_pixels(GLcontext *ctx, GLuint n, const GLint x[], const GLint y[], GLubyte red[], GLubyte green[], GLubyte blue[], GLubyte alpha[], const GLubyte mask[])
Definition: masking.c:125
void gl_mask_index_span(GLcontext *ctx, GLuint n, GLint x, GLint y, GLuint index[])
Definition: masking.c:161