1 /*
2 * Mesa 3-D graphics library
3 * Version: 7.1
4 *
5 * Copyright (C) 1999-2007 Brian Paul All Rights Reserved.
6 *
7 * Permission is hereby granted, free of charge, to any person obtaining a
8 * copy of this software and associated documentation files (the "Software"),
9 * to deal in the Software without restriction, including without limitation
10 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
11 * and/or sell copies of the Software, and to permit persons to whom the
12 * Software is furnished to do so, subject to the following conditions:
13 *
14 * The above copyright notice and this permission notice shall be included
15 * in all copies or substantial portions of the Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
18 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
21 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
22 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
23 */
24
25
26 /**
27 * \file stencil.c
28 * Stencil operations.
29 *
30 * Note: There's some conflict between GL_EXT_stencil_two_side and
31 * OpenGL 2.0's two-sided stencil feature.
32 *
33 * With GL_EXT_stencil_two_side, calling glStencilOp/Func/Mask() only the
34 * front OR back face state (as set by glActiveStencilFaceEXT) is set.
35 *
36 * But with OpenGL 2.0, calling glStencilOp/Func/Mask() sets BOTH the
37 * front AND back state.
38 *
39 * Also, note that GL_ATI_separate_stencil is different as well:
40 * glStencilFuncSeparateATI(GLenum frontfunc, GLenum backfunc, ...) vs.
41 * glStencilFuncSeparate(GLenum face, GLenum func, ...).
42 *
43 * This problem is solved by keeping three sets of stencil state:
44 * state[0] = GL_FRONT state.
45 * state[1] = OpenGL 2.0 / GL_ATI_separate_stencil GL_BACK state.
46 * state[2] = GL_EXT_stencil_two_side GL_BACK state.
47 */
48
49
50 #include "glheader.h"
51 #include "imports.h"
52 #include "context.h"
53 #include "macros.h"
54 #include "stencil.h"
55 #include "mtypes.h"
56
57
58 static GLboolean
validate_stencil_op(struct gl_context * ctx,GLenum op)59 validate_stencil_op(struct gl_context *ctx, GLenum op)
60 {
61 switch (op) {
62 case GL_KEEP:
63 case GL_ZERO:
64 case GL_REPLACE:
65 case GL_INCR:
66 case GL_DECR:
67 case GL_INVERT:
68 case GL_INCR_WRAP:
69 case GL_DECR_WRAP:
70 return GL_TRUE;
71 default:
72 return GL_FALSE;
73 }
74 }
75
76
77 static GLboolean
validate_stencil_func(struct gl_context * ctx,GLenum func)78 validate_stencil_func(struct gl_context *ctx, GLenum func)
79 {
80 switch (func) {
81 case GL_NEVER:
82 case GL_LESS:
83 case GL_LEQUAL:
84 case GL_GREATER:
85 case GL_GEQUAL:
86 case GL_EQUAL:
87 case GL_NOTEQUAL:
88 case GL_ALWAYS:
89 return GL_TRUE;
90 default:
91 return GL_FALSE;
92 }
93 }
94
95
96 /**
97 * Set the clear value for the stencil buffer.
98 *
99 * \param s clear value.
100 *
101 * \sa glClearStencil().
102 *
103 * Updates gl_stencil_attrib::Clear. On change
104 * flushes the vertices and notifies the driver via
105 * the dd_function_table::ClearStencil callback.
106 */
107 void GLAPIENTRY
_mesa_ClearStencil(GLint s)108 _mesa_ClearStencil( GLint s )
109 {
110 GET_CURRENT_CONTEXT(ctx);
111 ASSERT_OUTSIDE_BEGIN_END(ctx);
112
113 if (ctx->Stencil.Clear == (GLuint) s)
114 return;
115
116 FLUSH_VERTICES(ctx, _NEW_STENCIL);
117 ctx->Stencil.Clear = (GLuint) s;
118 }
119
120
121 /**
122 * Set the function and reference value for stencil testing.
123 *
124 * \param frontfunc front test function.
125 * \param backfunc back test function.
126 * \param ref front and back reference value.
127 * \param mask front and back bitmask.
128 *
129 * \sa glStencilFunc().
130 *
131 * Verifies the parameters and updates the respective values in
132 * __struct gl_contextRec::Stencil. On change flushes the vertices and notifies the
133 * driver via the dd_function_table::StencilFunc callback.
134 */
135 void GLAPIENTRY
_mesa_StencilFuncSeparateATI(GLenum frontfunc,GLenum backfunc,GLint ref,GLuint mask)136 _mesa_StencilFuncSeparateATI( GLenum frontfunc, GLenum backfunc, GLint ref, GLuint mask )
137 {
138 GET_CURRENT_CONTEXT(ctx);
139 const GLint stencilMax = (1 << ctx->DrawBuffer->Visual.stencilBits) - 1;
140 ASSERT_OUTSIDE_BEGIN_END(ctx);
141
142 if (MESA_VERBOSE & VERBOSE_API)
143 _mesa_debug(ctx, "glStencilFuncSeparateATI()\n");
144
145 if (!validate_stencil_func(ctx, frontfunc)) {
146 _mesa_error(ctx, GL_INVALID_ENUM,
147 "glStencilFuncSeparateATI(frontfunc)");
148 return;
149 }
150 if (!validate_stencil_func(ctx, backfunc)) {
151 _mesa_error(ctx, GL_INVALID_ENUM,
152 "glStencilFuncSeparateATI(backfunc)");
153 return;
154 }
155
156 ref = CLAMP( ref, 0, stencilMax );
157
158 /* set both front and back state */
159 if (ctx->Stencil.Function[0] == frontfunc &&
160 ctx->Stencil.Function[1] == backfunc &&
161 ctx->Stencil.ValueMask[0] == mask &&
162 ctx->Stencil.ValueMask[1] == mask &&
163 ctx->Stencil.Ref[0] == ref &&
164 ctx->Stencil.Ref[1] == ref)
165 return;
166 FLUSH_VERTICES(ctx, _NEW_STENCIL);
167 ctx->Stencil.Function[0] = frontfunc;
168 ctx->Stencil.Function[1] = backfunc;
169 ctx->Stencil.Ref[0] = ctx->Stencil.Ref[1] = ref;
170 ctx->Stencil.ValueMask[0] = ctx->Stencil.ValueMask[1] = mask;
171 if (ctx->Driver.StencilFuncSeparate) {
172 ctx->Driver.StencilFuncSeparate(ctx, GL_FRONT,
173 frontfunc, ref, mask);
174 ctx->Driver.StencilFuncSeparate(ctx, GL_BACK,
175 backfunc, ref, mask);
176 }
177 }
178
179
180 /**
181 * Set the function and reference value for stencil testing.
182 *
183 * \param func test function.
184 * \param ref reference value.
185 * \param mask bitmask.
186 *
187 * \sa glStencilFunc().
188 *
189 * Verifies the parameters and updates the respective values in
190 * __struct gl_contextRec::Stencil. On change flushes the vertices and notifies the
191 * driver via the dd_function_table::StencilFunc callback.
192 */
193 void GLAPIENTRY
_mesa_StencilFunc(GLenum func,GLint ref,GLuint mask)194 _mesa_StencilFunc( GLenum func, GLint ref, GLuint mask )
195 {
196 GET_CURRENT_CONTEXT(ctx);
197 const GLint stencilMax = (1 << ctx->DrawBuffer->Visual.stencilBits) - 1;
198 const GLint face = ctx->Stencil.ActiveFace;
199 ASSERT_OUTSIDE_BEGIN_END(ctx);
200
201 if (MESA_VERBOSE & VERBOSE_API)
202 _mesa_debug(ctx, "glStencilFunc()\n");
203
204 if (!validate_stencil_func(ctx, func)) {
205 _mesa_error(ctx, GL_INVALID_ENUM, "glStencilFunc(func)");
206 return;
207 }
208
209 ref = CLAMP( ref, 0, stencilMax );
210
211 if (face != 0) {
212 if (ctx->Stencil.Function[face] == func &&
213 ctx->Stencil.ValueMask[face] == mask &&
214 ctx->Stencil.Ref[face] == ref)
215 return;
216 FLUSH_VERTICES(ctx, _NEW_STENCIL);
217 ctx->Stencil.Function[face] = func;
218 ctx->Stencil.Ref[face] = ref;
219 ctx->Stencil.ValueMask[face] = mask;
220
221 /* Only propagate the change to the driver if EXT_stencil_two_side
222 * is enabled.
223 */
224 if (ctx->Driver.StencilFuncSeparate && ctx->Stencil.TestTwoSide) {
225 ctx->Driver.StencilFuncSeparate(ctx, GL_BACK, func, ref, mask);
226 }
227 }
228 else {
229 /* set both front and back state */
230 if (ctx->Stencil.Function[0] == func &&
231 ctx->Stencil.Function[1] == func &&
232 ctx->Stencil.ValueMask[0] == mask &&
233 ctx->Stencil.ValueMask[1] == mask &&
234 ctx->Stencil.Ref[0] == ref &&
235 ctx->Stencil.Ref[1] == ref)
236 return;
237 FLUSH_VERTICES(ctx, _NEW_STENCIL);
238 ctx->Stencil.Function[0] = ctx->Stencil.Function[1] = func;
239 ctx->Stencil.Ref[0] = ctx->Stencil.Ref[1] = ref;
240 ctx->Stencil.ValueMask[0] = ctx->Stencil.ValueMask[1] = mask;
241 if (ctx->Driver.StencilFuncSeparate) {
242 ctx->Driver.StencilFuncSeparate(ctx,
243 ((ctx->Stencil.TestTwoSide)
244 ? GL_FRONT : GL_FRONT_AND_BACK),
245 func, ref, mask);
246 }
247 }
248 }
249
250
251 /**
252 * Set the stencil writing mask.
253 *
254 * \param mask bit-mask to enable/disable writing of individual bits in the
255 * stencil planes.
256 *
257 * \sa glStencilMask().
258 *
259 * Updates gl_stencil_attrib::WriteMask. On change flushes the vertices and
260 * notifies the driver via the dd_function_table::StencilMask callback.
261 */
262 void GLAPIENTRY
_mesa_StencilMask(GLuint mask)263 _mesa_StencilMask( GLuint mask )
264 {
265 GET_CURRENT_CONTEXT(ctx);
266 const GLint face = ctx->Stencil.ActiveFace;
267
268 if (MESA_VERBOSE & VERBOSE_API)
269 _mesa_debug(ctx, "glStencilMask()\n");
270
271 ASSERT_OUTSIDE_BEGIN_END(ctx);
272
273 if (face != 0) {
274 /* Only modify the EXT_stencil_two_side back-face state.
275 */
276 if (ctx->Stencil.WriteMask[face] == mask)
277 return;
278 FLUSH_VERTICES(ctx, _NEW_STENCIL);
279 ctx->Stencil.WriteMask[face] = mask;
280
281 /* Only propagate the change to the driver if EXT_stencil_two_side
282 * is enabled.
283 */
284 if (ctx->Driver.StencilMaskSeparate && ctx->Stencil.TestTwoSide) {
285 ctx->Driver.StencilMaskSeparate(ctx, GL_BACK, mask);
286 }
287 }
288 else {
289 /* set both front and back state */
290 if (ctx->Stencil.WriteMask[0] == mask &&
291 ctx->Stencil.WriteMask[1] == mask)
292 return;
293 FLUSH_VERTICES(ctx, _NEW_STENCIL);
294 ctx->Stencil.WriteMask[0] = ctx->Stencil.WriteMask[1] = mask;
295 if (ctx->Driver.StencilMaskSeparate) {
296 ctx->Driver.StencilMaskSeparate(ctx,
297 ((ctx->Stencil.TestTwoSide)
298 ? GL_FRONT : GL_FRONT_AND_BACK),
299 mask);
300 }
301 }
302 }
303
304
305 /**
306 * Set the stencil test actions.
307 *
308 * \param fail action to take when stencil test fails.
309 * \param zfail action to take when stencil test passes, but depth test fails.
310 * \param zpass action to take when stencil test passes and the depth test
311 * passes (or depth testing is not enabled).
312 *
313 * \sa glStencilOp().
314 *
315 * Verifies the parameters and updates the respective fields in
316 * __struct gl_contextRec::Stencil. On change flushes the vertices and notifies the
317 * driver via the dd_function_table::StencilOp callback.
318 */
319 void GLAPIENTRY
_mesa_StencilOp(GLenum fail,GLenum zfail,GLenum zpass)320 _mesa_StencilOp(GLenum fail, GLenum zfail, GLenum zpass)
321 {
322 GET_CURRENT_CONTEXT(ctx);
323 const GLint face = ctx->Stencil.ActiveFace;
324
325 if (MESA_VERBOSE & VERBOSE_API)
326 _mesa_debug(ctx, "glStencilOp()\n");
327
328 ASSERT_OUTSIDE_BEGIN_END(ctx);
329
330 if (!validate_stencil_op(ctx, fail)) {
331 _mesa_error(ctx, GL_INVALID_ENUM, "glStencilOp(sfail)");
332 return;
333 }
334 if (!validate_stencil_op(ctx, zfail)) {
335 _mesa_error(ctx, GL_INVALID_ENUM, "glStencilOp(zfail)");
336 return;
337 }
338 if (!validate_stencil_op(ctx, zpass)) {
339 _mesa_error(ctx, GL_INVALID_ENUM, "glStencilOp(zpass)");
340 return;
341 }
342
343 if (face != 0) {
344 /* only set active face state */
345 if (ctx->Stencil.ZFailFunc[face] == zfail &&
346 ctx->Stencil.ZPassFunc[face] == zpass &&
347 ctx->Stencil.FailFunc[face] == fail)
348 return;
349 FLUSH_VERTICES(ctx, _NEW_STENCIL);
350 ctx->Stencil.ZFailFunc[face] = zfail;
351 ctx->Stencil.ZPassFunc[face] = zpass;
352 ctx->Stencil.FailFunc[face] = fail;
353
354 /* Only propagate the change to the driver if EXT_stencil_two_side
355 * is enabled.
356 */
357 if (ctx->Driver.StencilOpSeparate && ctx->Stencil.TestTwoSide) {
358 ctx->Driver.StencilOpSeparate(ctx, GL_BACK, fail, zfail, zpass);
359 }
360 }
361 else {
362 /* set both front and back state */
363 if (ctx->Stencil.ZFailFunc[0] == zfail &&
364 ctx->Stencil.ZFailFunc[1] == zfail &&
365 ctx->Stencil.ZPassFunc[0] == zpass &&
366 ctx->Stencil.ZPassFunc[1] == zpass &&
367 ctx->Stencil.FailFunc[0] == fail &&
368 ctx->Stencil.FailFunc[1] == fail)
369 return;
370 FLUSH_VERTICES(ctx, _NEW_STENCIL);
371 ctx->Stencil.ZFailFunc[0] = ctx->Stencil.ZFailFunc[1] = zfail;
372 ctx->Stencil.ZPassFunc[0] = ctx->Stencil.ZPassFunc[1] = zpass;
373 ctx->Stencil.FailFunc[0] = ctx->Stencil.FailFunc[1] = fail;
374 if (ctx->Driver.StencilOpSeparate) {
375 ctx->Driver.StencilOpSeparate(ctx,
376 ((ctx->Stencil.TestTwoSide)
377 ? GL_FRONT : GL_FRONT_AND_BACK),
378 fail, zfail, zpass);
379 }
380 }
381 }
382
383
384
385 #if _HAVE_FULL_GL
386 /* GL_EXT_stencil_two_side */
387 void GLAPIENTRY
_mesa_ActiveStencilFaceEXT(GLenum face)388 _mesa_ActiveStencilFaceEXT(GLenum face)
389 {
390 GET_CURRENT_CONTEXT(ctx);
391 ASSERT_OUTSIDE_BEGIN_END(ctx);
392
393 if (MESA_VERBOSE & VERBOSE_API)
394 _mesa_debug(ctx, "glActiveStencilFaceEXT()\n");
395
396 if (!ctx->Extensions.EXT_stencil_two_side) {
397 _mesa_error(ctx, GL_INVALID_OPERATION, "glActiveStencilFaceEXT");
398 return;
399 }
400
401 if (face == GL_FRONT || face == GL_BACK) {
402 FLUSH_VERTICES(ctx, _NEW_STENCIL);
403 ctx->Stencil.ActiveFace = (face == GL_FRONT) ? 0 : 2;
404 }
405 else {
406 _mesa_error(ctx, GL_INVALID_ENUM, "glActiveStencilFaceEXT(face)");
407 }
408 }
409 #endif
410
411
412
413 /**
414 * OpenGL 2.0 function.
415 * \todo Make StencilOp() call this function. And eventually remove the
416 * ctx->Driver.StencilOp function and use ctx->Driver.StencilOpSeparate
417 * instead.
418 */
419 void GLAPIENTRY
_mesa_StencilOpSeparate(GLenum face,GLenum sfail,GLenum zfail,GLenum zpass)420 _mesa_StencilOpSeparate(GLenum face, GLenum sfail, GLenum zfail, GLenum zpass)
421 {
422 GLboolean set = GL_FALSE;
423 GET_CURRENT_CONTEXT(ctx);
424 ASSERT_OUTSIDE_BEGIN_END(ctx);
425
426 if (MESA_VERBOSE & VERBOSE_API)
427 _mesa_debug(ctx, "glStencilOpSeparate()\n");
428
429 if (!validate_stencil_op(ctx, sfail)) {
430 _mesa_error(ctx, GL_INVALID_ENUM, "glStencilOpSeparate(sfail)");
431 return;
432 }
433 if (!validate_stencil_op(ctx, zfail)) {
434 _mesa_error(ctx, GL_INVALID_ENUM, "glStencilOpSeparate(zfail)");
435 return;
436 }
437 if (!validate_stencil_op(ctx, zpass)) {
438 _mesa_error(ctx, GL_INVALID_ENUM, "glStencilOpSeparate(zpass)");
439 return;
440 }
441 if (face != GL_FRONT && face != GL_BACK && face != GL_FRONT_AND_BACK) {
442 _mesa_error(ctx, GL_INVALID_ENUM, "glStencilOpSeparate(face)");
443 return;
444 }
445
446 if (face != GL_BACK) {
447 /* set front */
448 if (ctx->Stencil.ZFailFunc[0] != zfail ||
449 ctx->Stencil.ZPassFunc[0] != zpass ||
450 ctx->Stencil.FailFunc[0] != sfail){
451 FLUSH_VERTICES(ctx, _NEW_STENCIL);
452 ctx->Stencil.ZFailFunc[0] = zfail;
453 ctx->Stencil.ZPassFunc[0] = zpass;
454 ctx->Stencil.FailFunc[0] = sfail;
455 set = GL_TRUE;
456 }
457 }
458 if (face != GL_FRONT) {
459 /* set back */
460 if (ctx->Stencil.ZFailFunc[1] != zfail ||
461 ctx->Stencil.ZPassFunc[1] != zpass ||
462 ctx->Stencil.FailFunc[1] != sfail) {
463 FLUSH_VERTICES(ctx, _NEW_STENCIL);
464 ctx->Stencil.ZFailFunc[1] = zfail;
465 ctx->Stencil.ZPassFunc[1] = zpass;
466 ctx->Stencil.FailFunc[1] = sfail;
467 set = GL_TRUE;
468 }
469 }
470 if (set && ctx->Driver.StencilOpSeparate) {
471 ctx->Driver.StencilOpSeparate(ctx, face, sfail, zfail, zpass);
472 }
473 }
474
475
476 /* OpenGL 2.0 */
477 void GLAPIENTRY
_mesa_StencilFuncSeparate(GLenum face,GLenum func,GLint ref,GLuint mask)478 _mesa_StencilFuncSeparate(GLenum face, GLenum func, GLint ref, GLuint mask)
479 {
480 GET_CURRENT_CONTEXT(ctx);
481 const GLint stencilMax = (1 << ctx->DrawBuffer->Visual.stencilBits) - 1;
482 ASSERT_OUTSIDE_BEGIN_END(ctx);
483
484 if (MESA_VERBOSE & VERBOSE_API)
485 _mesa_debug(ctx, "glStencilFuncSeparate()\n");
486
487 if (face != GL_FRONT && face != GL_BACK && face != GL_FRONT_AND_BACK) {
488 _mesa_error(ctx, GL_INVALID_ENUM, "glStencilFuncSeparate(face)");
489 return;
490 }
491 if (!validate_stencil_func(ctx, func)) {
492 _mesa_error(ctx, GL_INVALID_ENUM, "glStencilFuncSeparate(func)");
493 return;
494 }
495
496 ref = CLAMP(ref, 0, stencilMax);
497
498 FLUSH_VERTICES(ctx, _NEW_STENCIL);
499
500 if (face != GL_BACK) {
501 /* set front */
502 ctx->Stencil.Function[0] = func;
503 ctx->Stencil.Ref[0] = ref;
504 ctx->Stencil.ValueMask[0] = mask;
505 }
506 if (face != GL_FRONT) {
507 /* set back */
508 ctx->Stencil.Function[1] = func;
509 ctx->Stencil.Ref[1] = ref;
510 ctx->Stencil.ValueMask[1] = mask;
511 }
512 if (ctx->Driver.StencilFuncSeparate) {
513 ctx->Driver.StencilFuncSeparate(ctx, face, func, ref, mask);
514 }
515 }
516
517
518 /* OpenGL 2.0 */
519 void GLAPIENTRY
_mesa_StencilMaskSeparate(GLenum face,GLuint mask)520 _mesa_StencilMaskSeparate(GLenum face, GLuint mask)
521 {
522 GET_CURRENT_CONTEXT(ctx);
523 ASSERT_OUTSIDE_BEGIN_END(ctx);
524
525 if (MESA_VERBOSE & VERBOSE_API)
526 _mesa_debug(ctx, "glStencilMaskSeparate()\n");
527
528 if (face != GL_FRONT && face != GL_BACK && face != GL_FRONT_AND_BACK) {
529 _mesa_error(ctx, GL_INVALID_ENUM, "glStencilaMaskSeparate(face)");
530 return;
531 }
532
533 FLUSH_VERTICES(ctx, _NEW_STENCIL);
534
535 if (face != GL_BACK) {
536 ctx->Stencil.WriteMask[0] = mask;
537 }
538 if (face != GL_FRONT) {
539 ctx->Stencil.WriteMask[1] = mask;
540 }
541 if (ctx->Driver.StencilMaskSeparate) {
542 ctx->Driver.StencilMaskSeparate(ctx, face, mask);
543 }
544 }
545
546
547 /**
548 * Update derived stencil state.
549 */
550 void
_mesa_update_stencil(struct gl_context * ctx)551 _mesa_update_stencil(struct gl_context *ctx)
552 {
553 const GLint face = ctx->Stencil._BackFace;
554
555 ctx->Stencil._Enabled = (ctx->Stencil.Enabled &&
556 ctx->DrawBuffer->Visual.stencilBits > 0);
557
558 ctx->Stencil._TestTwoSide =
559 ctx->Stencil._Enabled &&
560 (ctx->Stencil.Function[0] != ctx->Stencil.Function[face] ||
561 ctx->Stencil.FailFunc[0] != ctx->Stencil.FailFunc[face] ||
562 ctx->Stencil.ZPassFunc[0] != ctx->Stencil.ZPassFunc[face] ||
563 ctx->Stencil.ZFailFunc[0] != ctx->Stencil.ZFailFunc[face] ||
564 ctx->Stencil.Ref[0] != ctx->Stencil.Ref[face] ||
565 ctx->Stencil.ValueMask[0] != ctx->Stencil.ValueMask[face] ||
566 ctx->Stencil.WriteMask[0] != ctx->Stencil.WriteMask[face]);
567 }
568
569
570 /**
571 * Initialize the context stipple state.
572 *
573 * \param ctx GL context.
574 *
575 * Initializes __struct gl_contextRec::Stencil attribute group.
576 */
577 void
_mesa_init_stencil(struct gl_context * ctx)578 _mesa_init_stencil(struct gl_context *ctx)
579 {
580 ctx->Stencil.Enabled = GL_FALSE;
581 ctx->Stencil.TestTwoSide = GL_FALSE;
582 ctx->Stencil.ActiveFace = 0; /* 0 = GL_FRONT, 2 = GL_BACK */
583 ctx->Stencil.Function[0] = GL_ALWAYS;
584 ctx->Stencil.Function[1] = GL_ALWAYS;
585 ctx->Stencil.Function[2] = GL_ALWAYS;
586 ctx->Stencil.FailFunc[0] = GL_KEEP;
587 ctx->Stencil.FailFunc[1] = GL_KEEP;
588 ctx->Stencil.FailFunc[2] = GL_KEEP;
589 ctx->Stencil.ZPassFunc[0] = GL_KEEP;
590 ctx->Stencil.ZPassFunc[1] = GL_KEEP;
591 ctx->Stencil.ZPassFunc[2] = GL_KEEP;
592 ctx->Stencil.ZFailFunc[0] = GL_KEEP;
593 ctx->Stencil.ZFailFunc[1] = GL_KEEP;
594 ctx->Stencil.ZFailFunc[2] = GL_KEEP;
595 ctx->Stencil.Ref[0] = 0;
596 ctx->Stencil.Ref[1] = 0;
597 ctx->Stencil.Ref[2] = 0;
598 ctx->Stencil.ValueMask[0] = ~0U;
599 ctx->Stencil.ValueMask[1] = ~0U;
600 ctx->Stencil.ValueMask[2] = ~0U;
601 ctx->Stencil.WriteMask[0] = ~0U;
602 ctx->Stencil.WriteMask[1] = ~0U;
603 ctx->Stencil.WriteMask[2] = ~0U;
604 ctx->Stencil.Clear = 0;
605 ctx->Stencil._BackFace = 1;
606 }
607