3 * Mesa 3-D graphics library
6 * Copyright (C) 1999-2002 Brian Paul All Rights Reserved.
8 * Permission is hereby granted, free of charge, to any person obtaining a
9 * copy of this software and associated documentation files (the "Software"),
10 * to deal in the Software without restriction, including without limitation
11 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
12 * and/or sell copies of the Software, and to permit persons to whom the
13 * Software is furnished to do so, subject to the following conditions:
15 * The above copyright notice and this permission notice shall be included
16 * in all copies or substantial portions of the Software.
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
21 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
22 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
23 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
32 #include "s_alphabuf.h"
33 #include "s_context.h"
40 * Apply logic op to array of CI pixels.
43 index_logicop( GLcontext
*ctx
, GLuint n
, GLuint index
[], const GLuint dest
[],
44 const GLubyte mask
[] )
47 switch (ctx
->Color
.LogicOp
) {
65 case GL_COPY_INVERTED
:
96 index
[i
] = ~(index
[i
] & dest
[i
]);
110 index
[i
] = ~(index
[i
] | dest
[i
]);
124 index
[i
] = ~(index
[i
] ^ dest
[i
]);
131 index
[i
] = index
[i
] & ~dest
[i
];
135 case GL_AND_INVERTED
:
138 index
[i
] = ~index
[i
] & dest
[i
];
145 index
[i
] = index
[i
] | ~dest
[i
];
152 index
[i
] = ~index
[i
] | dest
[i
];
157 _mesa_problem(ctx
, "bad mode in index_logic()");
164 * Apply the current logic operator to a span of CI pixels. This is only
165 * used if the device driver can't do logic ops.
168 _swrast_logicop_ci_span( GLcontext
*ctx
, const struct sw_span
*span
,
171 SWcontext
*swrast
= SWRAST_CONTEXT(ctx
);
172 GLuint dest
[MAX_WIDTH
];
174 ASSERT(span
->end
< MAX_WIDTH
);
176 /* Read dest values from frame buffer */
177 if (span
->arrayMask
& SPAN_XY
) {
178 (*swrast
->Driver
.ReadCI32Pixels
)( ctx
, span
->end
,
179 span
->array
->x
, span
->array
->y
,
180 dest
, span
->array
->mask
);
183 (*swrast
->Driver
.ReadCI32Span
)( ctx
, span
->end
, span
->x
, span
->y
, dest
);
186 index_logicop( ctx
, span
->end
, index
, dest
, span
->array
->mask
);
192 * Apply logic operator to rgba pixels.
193 * Input: ctx - the context
194 * n - number of pixels
195 * mask - pixel mask array
196 * In/Out: src - incoming pixels which will be modified
197 * Input: dest - frame buffer values
199 * Note: Since the R, G, B, and A channels are all treated the same we
200 * process them as 4-byte GLuints instead of four GLubytes.
203 rgba_logicop_ui( const GLcontext
*ctx
, GLuint n
, const GLubyte mask
[],
204 GLuint src
[], const GLuint dest
[] )
207 switch (ctx
->Color
.LogicOp
) {
225 case GL_COPY_INVERTED
:
256 src
[i
] = ~(src
[i
] & dest
[i
]);
270 src
[i
] = ~(src
[i
] | dest
[i
]);
284 src
[i
] = ~(src
[i
] ^ dest
[i
]);
291 src
[i
] = src
[i
] & ~dest
[i
];
295 case GL_AND_INVERTED
:
298 src
[i
] = ~src
[i
] & dest
[i
];
305 src
[i
] = src
[i
] | ~dest
[i
];
312 src
[i
] = ~src
[i
] | dest
[i
];
317 /* should never happen */
318 _mesa_problem(ctx
, "Bad function in rgba_logicop");
324 * As above, but operate on GLchan values
325 * Note: need to pass n = numPixels * 4.
328 rgba_logicop_chan( const GLcontext
*ctx
, GLuint n
, const GLubyte mask
[],
329 GLchan srcPtr
[], const GLchan destPtr
[] )
331 #if CHAN_TYPE == GL_FLOAT
332 GLuint
*src
= (GLuint
*) srcPtr
;
333 const GLuint
*dest
= (const GLuint
*) destPtr
;
335 ASSERT(sizeof(GLfloat
) == sizeof(GLuint
));
337 GLchan
*src
= srcPtr
;
338 const GLchan
*dest
= destPtr
;
342 switch (ctx
->Color
.LogicOp
) {
360 case GL_COPY_INVERTED
:
391 src
[i
] = ~(src
[i
] & dest
[i
]);
405 src
[i
] = ~(src
[i
] | dest
[i
]);
419 src
[i
] = ~(src
[i
] ^ dest
[i
]);
426 src
[i
] = src
[i
] & ~dest
[i
];
430 case GL_AND_INVERTED
:
433 src
[i
] = ~src
[i
] & dest
[i
];
440 src
[i
] = src
[i
] | ~dest
[i
];
447 src
[i
] = ~src
[i
] | dest
[i
];
452 /* should never happen */
453 _mesa_problem(ctx
, "Bad function in rgba_logicop");
460 * Apply the current logic operator to a span of RGBA pixels.
461 * We can handle horizontal runs of pixels (spans) or arrays of x/y
465 _swrast_logicop_rgba_span( GLcontext
*ctx
, const struct sw_span
*span
,
468 SWcontext
*swrast
= SWRAST_CONTEXT(ctx
);
469 GLchan dest
[MAX_WIDTH
][4];
471 ASSERT(span
->end
< MAX_WIDTH
);
472 ASSERT(span
->arrayMask
& SPAN_RGBA
);
474 if (span
->arrayMask
& SPAN_XY
) {
475 (*swrast
->Driver
.ReadRGBAPixels
)(ctx
, span
->end
,
476 span
->array
->x
, span
->array
->y
,
477 dest
, span
->array
->mask
);
478 if (SWRAST_CONTEXT(ctx
)->_RasterMask
& ALPHABUF_BIT
) {
479 _swrast_read_alpha_pixels(ctx
, span
->end
,
480 span
->array
->x
, span
->array
->y
,
481 dest
, span
->array
->mask
);
485 _swrast_read_rgba_span(ctx
, ctx
->DrawBuffer
, span
->end
,
486 span
->x
, span
->y
, dest
);
489 if (sizeof(GLchan
) * 4 == sizeof(GLuint
)) {
490 rgba_logicop_ui(ctx
, span
->end
, span
->array
->mask
,
491 (GLuint
*) rgba
, (const GLuint
*) dest
);
494 rgba_logicop_chan(ctx
, 4 * span
->end
, span
->array
->mask
,
495 (GLchan
*) rgba
, (const GLchan
*) dest
);