src/mesa/main/stencil.c

   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  */
  31
  32
  33 #include "glheader.h"
  34 #include "imports.h"
  35 #include "context.h"
  36 #include "macros.h"
  37 #include "stencil.h"
  38 #include "mtypes.h"
  39
  40
  41 static GLboolean
  42 validate_stencil_op(GLcontext *ctx, GLenum op)
  43 {
  44    switch (op) {
  45    case GL_KEEP:
  46    case GL_ZERO:
  47    case GL_REPLACE:
  48    case GL_INCR:
  49    case GL_DECR:
  50    case GL_INVERT:
  51       return GL_TRUE;
  52    case GL_INCR_WRAP_EXT:
  53    case GL_DECR_WRAP_EXT:
  54       if (ctx->Extensions.EXT_stencil_wrap) {
  55          return GL_TRUE;
  56       }
  57       /* FALL-THROUGH */
  58    default:
  59       return GL_FALSE;
  60    }
  61 }
  62
  63
  64 static GLboolean
  65 validate_stencil_func(GLcontext *ctx, GLenum func)
  66 {
  67    switch (func) {
  68    case GL_NEVER:
  69    case GL_LESS:
  70    case GL_LEQUAL:
  71    case GL_GREATER:
  72    case GL_GEQUAL:
  73    case GL_EQUAL:
  74    case GL_NOTEQUAL:
  75    case GL_ALWAYS:
  76       return GL_TRUE;
  77    default:
  78       return GL_FALSE;
  79    }
  80 }
  81
  82
  83 /**
  84  * Set the clear value for the stencil buffer.
  85  *
  86  * \param s clear value.
  87  *
  88  * \sa glClearStencil().
  89  *
  90  * Updates gl_stencil_attrib::Clear. On change
  91  * flushes the vertices and notifies the driver via
  92  * the dd_function_table::ClearStencil callback.
  93  */
  94 void GLAPIENTRY
  95 _mesa_ClearStencil( GLint s )
  96 {
  97    GET_CURRENT_CONTEXT(ctx);
  98    ASSERT_OUTSIDE_BEGIN_END(ctx);
  99
 100    if (ctx->Stencil.Clear == (GLuint) s)
 101       return;
 102
 103    FLUSH_VERTICES(ctx, _NEW_STENCIL);
 104    ctx->Stencil.Clear = (GLuint) s;
 105
 106    if (ctx->Driver.ClearStencil) {
 107       ctx->Driver.ClearStencil( ctx, s );
 108    }
 109 }
 110
 111
 112 /**
 113  * Set the function and reference value for stencil testing.
 114  *
 115  * \param frontfunc front test function.
 116  * \param backfunc back test function.
 117  * \param ref front and back reference value.
 118  * \param mask front and back bitmask.
 119  *
 120  * \sa glStencilFunc().
 121  *
 122  * Verifies the parameters and updates the respective values in
 123  * __GLcontextRec::Stencil. On change flushes the vertices and notifies the
 124  * driver via the dd_function_table::StencilFunc callback.
 125  */
 126 void GLAPIENTRY
 127 _mesa_StencilFuncSeparateATI( GLenum frontfunc, GLenum backfunc, GLint ref, GLuint mask )
 128 {
 129    GET_CURRENT_CONTEXT(ctx);
 130    const GLint stencilMax = (1 << ctx->DrawBuffer->Visual.stencilBits) - 1;
 131    ASSERT_OUTSIDE_BEGIN_END(ctx);
 132
 133    if (!validate_stencil_func(ctx, frontfunc)) {
 134       _mesa_error(ctx, GL_INVALID_ENUM,
 135                   "glStencilFuncSeparateATI(frontfunc)");
 136       return;
 137    }
 138    if (!validate_stencil_func(ctx, backfunc)) {
 139       _mesa_error(ctx, GL_INVALID_ENUM,
 140                   "glStencilFuncSeparateATI(backfunc)");
 141       return;
 142    }
 143
 144    ref = CLAMP( ref, 0, stencilMax );
 145
 146    /* set both front and back state */
 147    if (ctx->Stencil.Function[0] == frontfunc &&
 148        ctx->Stencil.Function[1] == backfunc &&
 149        ctx->Stencil.ValueMask[0] == mask &&
 150        ctx->Stencil.ValueMask[1] == mask &&
 151        ctx->Stencil.Ref[0] == ref &&
 152        ctx->Stencil.Ref[1] == ref)
 153       return;
 154    FLUSH_VERTICES(ctx, _NEW_STENCIL);
 155    ctx->Stencil.Function[0]  = frontfunc;
 156    ctx->Stencil.Function[1]  = backfunc;
 157    ctx->Stencil.Ref[0]       = ctx->Stencil.Ref[1]       = ref;
 158    ctx->Stencil.ValueMask[0] = ctx->Stencil.ValueMask[1] = mask;
 159    if (ctx->Driver.StencilFuncSeparate) {
 160       ctx->Driver.StencilFuncSeparate(ctx, GL_FRONT,
 161                                       frontfunc, ref, mask);
 162       ctx->Driver.StencilFuncSeparate(ctx, GL_BACK,
 163                                       backfunc, ref, mask);
 164    }
 165 }
 166
 167
 168 /**
 169  * Set the function and reference value for stencil testing.
 170  *
 171  * \param func test function.
 172  * \param ref reference value.
 173  * \param mask bitmask.
 174  *
 175  * \sa glStencilFunc().
 176  *
 177  * Verifies the parameters and updates the respective values in
 178  * __GLcontextRec::Stencil. On change flushes the vertices and notifies the
 179  * driver via the dd_function_table::StencilFunc callback.
 180  */
 181 void GLAPIENTRY
 182 _mesa_StencilFunc( GLenum func, GLint ref, GLuint mask )
 183 {
 184    GET_CURRENT_CONTEXT(ctx);
 185    const GLint stencilMax = (1 << ctx->DrawBuffer->Visual.stencilBits) - 1;
 186    const GLint face = ctx->Stencil.ActiveFace;
 187    ASSERT_OUTSIDE_BEGIN_END(ctx);
 188
 189    if (!validate_stencil_func(ctx, func)) {
 190       _mesa_error(ctx, GL_INVALID_ENUM, "glStencilFunc(func)");
 191       return;
 192    }
 193
 194    ref = CLAMP( ref, 0, stencilMax );
 195
 196    if (face != 0) {
 197       if (ctx->Stencil.Function[face] == func &&
 198           ctx->Stencil.ValueMask[face] == mask &&
 199           ctx->Stencil.Ref[face] == ref)
 200          return;
 201       FLUSH_VERTICES(ctx, _NEW_STENCIL);
 202       ctx->Stencil.Function[face] = func;
 203       ctx->Stencil.Ref[face] = ref;
 204       ctx->Stencil.ValueMask[face] = mask;
 205
 206       /* Only propagate the change to the driver if EXT_stencil_two_side
 207        * is enabled.
 208        */
 209       if (ctx->Driver.StencilFuncSeparate && ctx->Stencil.TestTwoSide) {
 210          ctx->Driver.StencilFuncSeparate(ctx, GL_BACK, func, ref, mask);
 211       }
 212    }
 213    else {
 214       /* set both front and back state */
 215       if (ctx->Stencil.Function[0] == func &&
 216           ctx->Stencil.Function[1] == func &&
 217           ctx->Stencil.ValueMask[0] == mask &&
 218           ctx->Stencil.ValueMask[1] == mask &&
 219           ctx->Stencil.Ref[0] == ref &&
 220           ctx->Stencil.Ref[1] == ref)
 221          return;
 222       FLUSH_VERTICES(ctx, _NEW_STENCIL);
 223       ctx->Stencil.Function[0]  = ctx->Stencil.Function[1]  = func;
 224       ctx->Stencil.Ref[0]       = ctx->Stencil.Ref[1]       = ref;
 225       ctx->Stencil.ValueMask[0] = ctx->Stencil.ValueMask[1] = mask;
 226       if (ctx->Driver.StencilFuncSeparate) {
 227          ctx->Driver.StencilFuncSeparate(ctx,
 228                                          ((ctx->Stencil.TestTwoSide)
 229                                           ? GL_FRONT : GL_FRONT_AND_BACK),
 230                                          func, ref, mask);
 231       }
 232    }
 233 }
 234
 235
 236 /**
 237  * Set the stencil writing mask.
 238  *
 239  * \param mask bit-mask to enable/disable writing of individual bits in the
 240  * stencil planes.
 241  *
 242  * \sa glStencilMask().
 243  *
 244  * Updates gl_stencil_attrib::WriteMask. On change flushes the vertices and
 245  * notifies the driver via the dd_function_table::StencilMask callback.
 246  */
 247 void GLAPIENTRY
 248 _mesa_StencilMask( GLuint mask )
 249 {
 250    GET_CURRENT_CONTEXT(ctx);
 251    const GLint face = ctx->Stencil.ActiveFace;
 252
 253    ASSERT_OUTSIDE_BEGIN_END(ctx);
 254
 255    if (face != 0) {
 256       /* Only modify the EXT_stencil_two_side back-face state.
 257        */
 258       if (ctx->Stencil.WriteMask[face] == mask)
 259          return;
 260       FLUSH_VERTICES(ctx, _NEW_STENCIL);
 261       ctx->Stencil.WriteMask[face] = mask;
 262
 263       /* Only propagate the change to the driver if EXT_stencil_two_side
 264        * is enabled.
 265        */
 266       if (ctx->Driver.StencilMaskSeparate && ctx->Stencil.TestTwoSide) {
 267          ctx->Driver.StencilMaskSeparate(ctx, GL_BACK, mask);
 268       }
 269    }
 270    else {
 271       /* set both front and back state */
 272       if (ctx->Stencil.WriteMask[0] == mask &&
 273           ctx->Stencil.WriteMask[1] == mask)
 274          return;
 275       FLUSH_VERTICES(ctx, _NEW_STENCIL);
 276       ctx->Stencil.WriteMask[0] = ctx->Stencil.WriteMask[1] = mask;
 277       if (ctx->Driver.StencilMaskSeparate) {
 278          ctx->Driver.StencilMaskSeparate(ctx,
 279                                          ((ctx->Stencil.TestTwoSide)
 280                                           ? GL_FRONT : GL_FRONT_AND_BACK),
 281                                           mask);
 282       }
 283    }
 284 }
 285
 286
 287 /**
 288  * Set the stencil test actions.
 289  *
 290  * \param fail action to take when stencil test fails.
 291  * \param zfail action to take when stencil test passes, but depth test fails.
 292  * \param zpass action to take when stencil test passes and the depth test
 293  * passes (or depth testing is not enabled).
 294  *
 295  * \sa glStencilOp().
 296  *
 297  * Verifies the parameters and updates the respective fields in
 298  * __GLcontextRec::Stencil. On change flushes the vertices and notifies the
 299  * driver via the dd_function_table::StencilOp callback.
 300  */
 301 void GLAPIENTRY
 302 _mesa_StencilOp(GLenum fail, GLenum zfail, GLenum zpass)
 303 {
 304    GET_CURRENT_CONTEXT(ctx);
 305    const GLint face = ctx->Stencil.ActiveFace;
 306
 307    ASSERT_OUTSIDE_BEGIN_END(ctx);
 308
 309    if (!validate_stencil_op(ctx, fail)) {
 310       _mesa_error(ctx, GL_INVALID_ENUM, "glStencilOp(sfail)");
 311       return;
 312    }
 313    if (!validate_stencil_op(ctx, zfail)) {
 314       _mesa_error(ctx, GL_INVALID_ENUM, "glStencilOp(zfail)");
 315       return;
 316    }
 317    if (!validate_stencil_op(ctx, zpass)) {
 318       _mesa_error(ctx, GL_INVALID_ENUM, "glStencilOp(zpass)");
 319       return;
 320    }
 321
 322    if (face != 0) {
 323       /* only set active face state */
 324       if (ctx->Stencil.ZFailFunc[face] == zfail &&
 325           ctx->Stencil.ZPassFunc[face] == zpass &&
 326           ctx->Stencil.FailFunc[face] == fail)
 327          return;
 328       FLUSH_VERTICES(ctx, _NEW_STENCIL);
 329       ctx->Stencil.ZFailFunc[face] = zfail;
 330       ctx->Stencil.ZPassFunc[face] = zpass;
 331       ctx->Stencil.FailFunc[face] = fail;
 332
 333       /* Only propagate the change to the driver if EXT_stencil_two_side
 334        * is enabled.
 335        */
 336       if (ctx->Driver.StencilOpSeparate && ctx->Stencil.TestTwoSide) {
 337          ctx->Driver.StencilOpSeparate(ctx, GL_BACK, fail, zfail, zpass);
 338       }
 339    }
 340    else {
 341       /* set both front and back state */
 342       if (ctx->Stencil.ZFailFunc[0] == zfail &&
 343           ctx->Stencil.ZFailFunc[1] == zfail &&
 344           ctx->Stencil.ZPassFunc[0] == zpass &&
 345           ctx->Stencil.ZPassFunc[1] == zpass &&
 346           ctx->Stencil.FailFunc[0] == fail &&
 347           ctx->Stencil.FailFunc[1] == fail)
 348          return;
 349       FLUSH_VERTICES(ctx, _NEW_STENCIL);
 350       ctx->Stencil.ZFailFunc[0] = ctx->Stencil.ZFailFunc[1] = zfail;
 351       ctx->Stencil.ZPassFunc[0] = ctx->Stencil.ZPassFunc[1] = zpass;
 352       ctx->Stencil.FailFunc[0]  = ctx->Stencil.FailFunc[1]  = fail;
 353       if (ctx->Driver.StencilOpSeparate) {
 354          ctx->Driver.StencilOpSeparate(ctx,
 355                                        ((ctx->Stencil.TestTwoSide)
 356                                         ? GL_FRONT : GL_FRONT_AND_BACK),
 357                                        fail, zfail, zpass);
 358       }
 359    }
 360 }
 361
 362
 363
 364 #if _HAVE_FULL_GL
 365 /* GL_EXT_stencil_two_side */
 366 void GLAPIENTRY
 367 _mesa_ActiveStencilFaceEXT(GLenum face)
 368 {
 369    GET_CURRENT_CONTEXT(ctx);
 370    ASSERT_OUTSIDE_BEGIN_END(ctx);
 371
 372    if (!ctx->Extensions.EXT_stencil_two_side) {
 373       _mesa_error(ctx, GL_INVALID_OPERATION, "glActiveStencilFaceEXT");
 374       return;
 375    }
 376
 377    if (face == GL_FRONT || face == GL_BACK) {
 378       FLUSH_VERTICES(ctx, _NEW_STENCIL);
 379       ctx->Stencil.ActiveFace = (face == GL_FRONT) ? 0 : 2;
 380    }
 381    else {
 382       _mesa_error(ctx, GL_INVALID_ENUM, "glActiveStencilFaceEXT(face)");
 383    }
 384 }
 385 #endif
 386
 387
 388
 389 /**
 390  * OpenGL 2.0 function.
 391  * \todo Make StencilOp() call this function.  And eventually remove the
 392  * ctx->Driver.StencilOp function and use ctx->Driver.StencilOpSeparate
 393  * instead.
 394  */
 395 void GLAPIENTRY
 396 _mesa_StencilOpSeparate(GLenum face, GLenum sfail, GLenum zfail, GLenum zpass)
 397 {
 398    GLboolean set = GL_FALSE;
 399    GET_CURRENT_CONTEXT(ctx);
 400    ASSERT_OUTSIDE_BEGIN_END(ctx);
 401
 402    if (!validate_stencil_op(ctx, sfail)) {
 403       _mesa_error(ctx, GL_INVALID_ENUM, "glStencilOpSeparate(sfail)");
 404       return;
 405    }
 406    if (!validate_stencil_op(ctx, zfail)) {
 407       _mesa_error(ctx, GL_INVALID_ENUM, "glStencilOpSeparate(zfail)");
 408       return;
 409    }
 410    if (!validate_stencil_op(ctx, zpass)) {
 411       _mesa_error(ctx, GL_INVALID_ENUM, "glStencilOpSeparate(zpass)");
 412       return;
 413    }
 414    if (face != GL_FRONT && face != GL_BACK && face != GL_FRONT_AND_BACK) {
 415       _mesa_error(ctx, GL_INVALID_ENUM, "glStencilOpSeparate(face)");
 416       return;
 417    }
 418
 419    if (face != GL_BACK) {
 420       /* set front */
 421       if (ctx->Stencil.ZFailFunc[0] != zfail ||
 422           ctx->Stencil.ZPassFunc[0] != zpass ||
 423           ctx->Stencil.FailFunc[0] != sfail){
 424          FLUSH_VERTICES(ctx, _NEW_STENCIL);
 425          ctx->Stencil.ZFailFunc[0] = zfail;
 426          ctx->Stencil.ZPassFunc[0] = zpass;
 427          ctx->Stencil.FailFunc[0] = sfail;
 428          set = GL_TRUE;
 429       }
 430    }
 431    if (face != GL_FRONT) {
 432       /* set back */
 433       if (ctx->Stencil.ZFailFunc[1] != zfail ||
 434           ctx->Stencil.ZPassFunc[1] != zpass ||
 435           ctx->Stencil.FailFunc[1] != sfail) {
 436          FLUSH_VERTICES(ctx, _NEW_STENCIL);
 437          ctx->Stencil.ZFailFunc[1] = zfail;
 438          ctx->Stencil.ZPassFunc[1] = zpass;
 439          ctx->Stencil.FailFunc[1] = sfail;
 440          set = GL_TRUE;
 441       }
 442    }
 443    if (set && ctx->Driver.StencilOpSeparate) {
 444       ctx->Driver.StencilOpSeparate(ctx, face, sfail, zfail, zpass);
 445    }
 446 }
 447
 448
 449 /* OpenGL 2.0 */
 450 void GLAPIENTRY
 451 _mesa_StencilFuncSeparate(GLenum face, GLenum func, GLint ref, GLuint mask)
 452 {
 453    GET_CURRENT_CONTEXT(ctx);
 454    const GLint stencilMax = (1 << ctx->DrawBuffer->Visual.stencilBits) - 1;
 455    ASSERT_OUTSIDE_BEGIN_END(ctx);
 456
 457    if (face != GL_FRONT && face != GL_BACK && face != GL_FRONT_AND_BACK) {
 458       _mesa_error(ctx, GL_INVALID_ENUM, "glStencilFuncSeparate(face)");
 459       return;
 460    }
 461    if (!validate_stencil_func(ctx, func)) {
 462       _mesa_error(ctx, GL_INVALID_ENUM, "glStencilFuncSeparate(func)");
 463       return;
 464    }
 465
 466    ref = CLAMP(ref, 0, stencilMax);
 467
 468    FLUSH_VERTICES(ctx, _NEW_STENCIL);
 469
 470    if (face != GL_BACK) {
 471       /* set front */
 472       ctx->Stencil.Function[0] = func;
 473       ctx->Stencil.Ref[0] = ref;
 474       ctx->Stencil.ValueMask[0] = mask;
 475    }
 476    if (face != GL_FRONT) {
 477       /* set back */
 478       ctx->Stencil.Function[1] = func;
 479       ctx->Stencil.Ref[1] = ref;
 480       ctx->Stencil.ValueMask[1] = mask;
 481    }
 482    if (ctx->Driver.StencilFuncSeparate) {
 483       ctx->Driver.StencilFuncSeparate(ctx, face, func, ref, mask);
 484    }
 485 }
 486
 487
 488 /* OpenGL 2.0 */
 489 void GLAPIENTRY
 490 _mesa_StencilMaskSeparate(GLenum face, GLuint mask)
 491 {
 492    GET_CURRENT_CONTEXT(ctx);
 493    ASSERT_OUTSIDE_BEGIN_END(ctx);
 494
 495    if (face != GL_FRONT && face != GL_BACK && face != GL_FRONT_AND_BACK) {
 496       _mesa_error(ctx, GL_INVALID_ENUM, "glStencilaMaskSeparate(face)");
 497       return;
 498    }
 499
 500    FLUSH_VERTICES(ctx, _NEW_STENCIL);
 501
 502    if (face != GL_BACK) {
 503       ctx->Stencil.WriteMask[0] = mask;
 504    }
 505    if (face != GL_FRONT) {
 506       ctx->Stencil.WriteMask[1] = mask;
 507    }
 508    if (ctx->Driver.StencilMaskSeparate) {
 509       ctx->Driver.StencilMaskSeparate(ctx, face, mask);
 510    }
 511 }
 512
 513
 514 /**
 515  * Update derived stencil state.
 516  */
 517 void
 518 _mesa_update_stencil(GLcontext *ctx)
 519 {
 520    const GLint face = ctx->Stencil._BackFace;
 521
 522    ctx->Stencil._TestTwoSide =
 523        (ctx->Stencil.Function[0] != ctx->Stencil.Function[face] ||
 524         ctx->Stencil.FailFunc[0] != ctx->Stencil.FailFunc[face] ||
 525         ctx->Stencil.ZPassFunc[0] != ctx->Stencil.ZPassFunc[face] ||
 526         ctx->Stencil.ZFailFunc[0] != ctx->Stencil.ZFailFunc[face] ||
 527         ctx->Stencil.Ref[0] != ctx->Stencil.Ref[face] ||
 528         ctx->Stencil.ValueMask[0] != ctx->Stencil.ValueMask[face] ||
 529         ctx->Stencil.WriteMask[0] != ctx->Stencil.WriteMask[face]);
 530 }
 531
 532
 533 /**
 534  * Initialize the context stipple state.
 535  *
 536  * \param ctx GL context.
 537  *
 538  * Initializes __GLcontextRec::Stencil attribute group.
 539  */
 540 void
 541 _mesa_init_stencil(GLcontext *ctx)
 542 {
 543    ctx->Stencil.Enabled = GL_FALSE;
 544    ctx->Stencil.TestTwoSide = GL_FALSE;
 545    ctx->Stencil.ActiveFace = 0;  /* 0 = GL_FRONT, 1 = GL_BACK */
 546    ctx->Stencil.Function[0] = GL_ALWAYS;
 547    ctx->Stencil.Function[1] = GL_ALWAYS;
 548    ctx->Stencil.Function[2] = GL_ALWAYS;
 549    ctx->Stencil.FailFunc[0] = GL_KEEP;
 550    ctx->Stencil.FailFunc[1] = GL_KEEP;
 551    ctx->Stencil.FailFunc[2] = GL_KEEP;
 552    ctx->Stencil.ZPassFunc[0] = GL_KEEP;
 553    ctx->Stencil.ZPassFunc[1] = GL_KEEP;
 554    ctx->Stencil.ZPassFunc[2] = GL_KEEP;
 555    ctx->Stencil.ZFailFunc[0] = GL_KEEP;
 556    ctx->Stencil.ZFailFunc[1] = GL_KEEP;
 557    ctx->Stencil.ZFailFunc[2] = GL_KEEP;
 558    ctx->Stencil.Ref[0] = 0;
 559    ctx->Stencil.Ref[1] = 0;
 560    ctx->Stencil.Ref[2] = 0;
 561    ctx->Stencil.ValueMask[0] = ~0U;
 562    ctx->Stencil.ValueMask[1] = ~0U;
 563    ctx->Stencil.ValueMask[2] = ~0U;
 564    ctx->Stencil.WriteMask[0] = ~0U;
 565    ctx->Stencil.WriteMask[1] = ~0U;
 566    ctx->Stencil.WriteMask[2] = ~0U;
 567    ctx->Stencil.Clear = 0;
 568 }