reactos/dll/opengl/mesa/src/mesa/main/blend.c

   1 /**
   2  * \file blend.c
   3  * Blending operations.
   4  */
   5
   6 /*
   7  * Mesa 3-D graphics library
   8  * Version:  6.5.1
   9  *
  10  * Copyright (C) 1999-2006  Brian Paul   All Rights Reserved.
  11  *
  12  * Permission is hereby granted, free of charge, to any person obtaining a
  13  * copy of this software and associated documentation files (the "Software"),
  14  * to deal in the Software without restriction, including without limitation
  15  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  16  * and/or sell copies of the Software, and to permit persons to whom the
  17  * Software is furnished to do so, subject to the following conditions:
  18  *
  19  * The above copyright notice and this permission notice shall be included
  20  * in all copies or substantial portions of the Software.
  21  *
  22  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  23  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  24  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  25  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  26  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  27  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  28  */
  29
  30
  31
  32 #include "glheader.h"
  33 #include "blend.h"
  34 #include "context.h"
  35 #include "enums.h"
  36 #include "macros.h"
  37 #include "mtypes.h"
  38
  39
  40
  41 /**
  42  * Check if given blend source factor is legal.
  43  * \return GL_TRUE if legal, GL_FALSE otherwise.
  44  */
  45 static GLboolean
  46 legal_src_factor(const struct gl_context *ctx, GLenum factor)
  47 {
  48    switch (factor) {
  49    case GL_SRC_COLOR:
  50    case GL_ONE_MINUS_SRC_COLOR:
  51       return ctx->Extensions.NV_blend_square;
  52    case GL_ZERO:
  53    case GL_ONE:
  54    case GL_DST_COLOR:
  55    case GL_ONE_MINUS_DST_COLOR:
  56    case GL_SRC_ALPHA:
  57    case GL_ONE_MINUS_SRC_ALPHA:
  58    case GL_DST_ALPHA:
  59    case GL_ONE_MINUS_DST_ALPHA:
  60    case GL_SRC_ALPHA_SATURATE:
  61    case GL_CONSTANT_COLOR:
  62    case GL_ONE_MINUS_CONSTANT_COLOR:
  63    case GL_CONSTANT_ALPHA:
  64    case GL_ONE_MINUS_CONSTANT_ALPHA:
  65       return GL_TRUE;
  66    default:
  67       return GL_FALSE;
  68    }
  69 }
  70
  71
  72 /**
  73  * Check if given blend destination factor is legal.
  74  * \return GL_TRUE if legal, GL_FALSE otherwise.
  75  */
  76 static GLboolean
  77 legal_dst_factor(const struct gl_context *ctx, GLenum factor)
  78 {
  79    switch (factor) {
  80    case GL_DST_COLOR:
  81    case GL_ONE_MINUS_DST_COLOR:
  82       return ctx->Extensions.NV_blend_square;
  83    case GL_ZERO:
  84    case GL_ONE:
  85    case GL_SRC_COLOR:
  86    case GL_ONE_MINUS_SRC_COLOR:
  87    case GL_SRC_ALPHA:
  88    case GL_ONE_MINUS_SRC_ALPHA:
  89    case GL_DST_ALPHA:
  90    case GL_ONE_MINUS_DST_ALPHA:
  91    case GL_CONSTANT_COLOR:
  92    case GL_ONE_MINUS_CONSTANT_COLOR:
  93    case GL_CONSTANT_ALPHA:
  94    case GL_ONE_MINUS_CONSTANT_ALPHA:
  95       return GL_TRUE;
  96    default:
  97       return GL_FALSE;
  98    }
  99 }
 100
 101
 102 /**
 103  * Check if src/dest RGB/A blend factors are legal.  If not generate
 104  * a GL error.
 105  * \return GL_TRUE if factors are legal, GL_FALSE otherwise.
 106  */
 107 static GLboolean
 108 validate_blend_factors(struct gl_context *ctx, const char *func,
 109                        GLenum sfactorRGB, GLenum dfactorRGB,
 110                        GLenum sfactorA, GLenum dfactorA)
 111 {
 112    if (!legal_src_factor(ctx, sfactorRGB)) {
 113       _mesa_error(ctx, GL_INVALID_ENUM,
 114                   "%s(sfactorRGB = %s)", func,
 115                   _mesa_lookup_enum_by_nr(sfactorRGB));
 116       return GL_FALSE;
 117    }
 118
 119    if (!legal_dst_factor(ctx, dfactorRGB)) {
 120       _mesa_error(ctx, GL_INVALID_ENUM,
 121                   "%s(dfactorRGB = %s)", func,
 122                   _mesa_lookup_enum_by_nr(dfactorRGB));
 123       return GL_FALSE;
 124    }
 125
 126    if (sfactorA != sfactorRGB && !legal_src_factor(ctx, sfactorA)) {
 127       _mesa_error(ctx, GL_INVALID_ENUM,
 128                   "%s(sfactorA = %s)", func,
 129                   _mesa_lookup_enum_by_nr(sfactorA));
 130       return GL_FALSE;
 131    }
 132
 133    if (dfactorA != dfactorRGB && !legal_dst_factor(ctx, dfactorA)) {
 134       _mesa_error(ctx, GL_INVALID_ENUM,
 135                   "%s(dfactorA = %s)", func,
 136                   _mesa_lookup_enum_by_nr(dfactorA));
 137       return GL_FALSE;
 138    }
 139
 140    return GL_TRUE;
 141 }
 142
 143
 144 /**
 145  * Specify the blending operation.
 146  *
 147  * \param sfactor source factor operator.
 148  * \param dfactor destination factor operator.
 149  *
 150  * \sa glBlendFunc, glBlendFuncSeparateEXT
 151  */
 152 void GLAPIENTRY
 153 _mesa_BlendFunc( GLenum sfactor, GLenum dfactor )
 154 {
 155    _mesa_BlendFuncSeparateEXT(sfactor, dfactor, sfactor, dfactor);
 156 }
 157
 158
 159 /**
 160  * Set the separate blend source/dest factors for all draw buffers.
 161  *
 162  * \param sfactorRGB RGB source factor operator.
 163  * \param dfactorRGB RGB destination factor operator.
 164  * \param sfactorA alpha source factor operator.
 165  * \param dfactorA alpha destination factor operator.
 166  */
 167 void GLAPIENTRY
 168 _mesa_BlendFuncSeparateEXT( GLenum sfactorRGB, GLenum dfactorRGB,
 169                             GLenum sfactorA, GLenum dfactorA )
 170 {
 171    GLuint buf, numBuffers;
 172    GLboolean changed;
 173    GET_CURRENT_CONTEXT(ctx);
 174    ASSERT_OUTSIDE_BEGIN_END(ctx);
 175
 176    if (MESA_VERBOSE & VERBOSE_API)
 177       _mesa_debug(ctx, "glBlendFuncSeparate %s %s %s %s\n",
 178                   _mesa_lookup_enum_by_nr(sfactorRGB),
 179                   _mesa_lookup_enum_by_nr(dfactorRGB),
 180                   _mesa_lookup_enum_by_nr(sfactorA),
 181                   _mesa_lookup_enum_by_nr(dfactorA));
 182
 183    if (!validate_blend_factors(ctx, "glBlendFuncSeparate",
 184                                sfactorRGB, dfactorRGB,
 185                                sfactorA, dfactorA)) {
 186       return;
 187    }
 188
 189    numBuffers = ctx->Extensions.ARB_draw_buffers_blend
 190       ? ctx->Const.MaxDrawBuffers : 1;
 191
 192    changed = GL_FALSE;
 193    for (buf = 0; buf < numBuffers; buf++) {
 194       if (ctx->Color.Blend[buf].SrcRGB != sfactorRGB ||
 195           ctx->Color.Blend[buf].DstRGB != dfactorRGB ||
 196           ctx->Color.Blend[buf].SrcA != sfactorA ||
 197           ctx->Color.Blend[buf].DstA != dfactorA) {
 198          changed = GL_TRUE;
 199          break;
 200       }
 201    }
 202    if (!changed)
 203       return;
 204
 205    FLUSH_VERTICES(ctx, _NEW_COLOR);
 206
 207    for (buf = 0; buf < numBuffers; buf++) {
 208       ctx->Color.Blend[buf].SrcRGB = sfactorRGB;
 209       ctx->Color.Blend[buf].DstRGB = dfactorRGB;
 210       ctx->Color.Blend[buf].SrcA = sfactorA;
 211       ctx->Color.Blend[buf].DstA = dfactorA;
 212    }
 213    ctx->Color._BlendFuncPerBuffer = GL_FALSE;
 214
 215    if (ctx->Driver.BlendFuncSeparate) {
 216       ctx->Driver.BlendFuncSeparate(ctx, sfactorRGB, dfactorRGB,
 217                                     sfactorA, dfactorA);
 218    }
 219 }
 220
 221
 222 #if _HAVE_FULL_GL
 223
 224
 225 /**
 226  * Set blend source/dest factors for one color buffer/target.
 227  */
 228 void GLAPIENTRY
 229 _mesa_BlendFunci(GLuint buf, GLenum sfactor, GLenum dfactor)
 230 {
 231    _mesa_BlendFuncSeparatei(buf, sfactor, dfactor, sfactor, dfactor);
 232 }
 233
 234
 235 /**
 236  * Set separate blend source/dest factors for one color buffer/target.
 237  */
 238 void GLAPIENTRY
 239 _mesa_BlendFuncSeparatei(GLuint buf, GLenum sfactorRGB, GLenum dfactorRGB,
 240                          GLenum sfactorA, GLenum dfactorA)
 241 {
 242    GET_CURRENT_CONTEXT(ctx);
 243    ASSERT_OUTSIDE_BEGIN_END(ctx);
 244
 245    if (!ctx->Extensions.ARB_draw_buffers_blend) {
 246       _mesa_error(ctx, GL_INVALID_OPERATION, "glBlendFunc[Separate]i()");
 247       return;
 248    }
 249
 250    if (buf >= ctx->Const.MaxDrawBuffers) {
 251       _mesa_error(ctx, GL_INVALID_VALUE, "glBlendFuncSeparatei(buffer=%u)",
 252                   buf);
 253       return;
 254    }
 255
 256    if (!validate_blend_factors(ctx, "glBlendFuncSeparatei",
 257                                sfactorRGB, dfactorRGB,
 258                                sfactorA, dfactorA)) {
 259       return;
 260    }
 261
 262    if (ctx->Color.Blend[buf].SrcRGB == sfactorRGB &&
 263        ctx->Color.Blend[buf].DstRGB == dfactorRGB &&
 264        ctx->Color.Blend[buf].SrcA == sfactorA &&
 265        ctx->Color.Blend[buf].DstA == dfactorA)
 266       return; /* no change */
 267
 268    FLUSH_VERTICES(ctx, _NEW_COLOR);
 269
 270    ctx->Color.Blend[buf].SrcRGB = sfactorRGB;
 271    ctx->Color.Blend[buf].DstRGB = dfactorRGB;
 272    ctx->Color.Blend[buf].SrcA = sfactorA;
 273    ctx->Color.Blend[buf].DstA = dfactorA;
 274    ctx->Color._BlendFuncPerBuffer = GL_TRUE;
 275
 276    if (ctx->Driver.BlendFuncSeparatei) {
 277       ctx->Driver.BlendFuncSeparatei(ctx, buf, sfactorRGB, dfactorRGB,
 278                                      sfactorA, dfactorA);
 279    }
 280 }
 281
 282
 283 /**
 284  * Check if given blend equation is legal.
 285  * \return GL_TRUE if legal, GL_FALSE otherwise.
 286  */
 287 static GLboolean
 288 legal_blend_equation(const struct gl_context *ctx, GLenum mode)
 289 {
 290    switch (mode) {
 291    case GL_FUNC_ADD:
 292    case GL_FUNC_SUBTRACT:
 293    case GL_FUNC_REVERSE_SUBTRACT:
 294       return GL_TRUE;
 295    case GL_MIN:
 296    case GL_MAX:
 297       return ctx->Extensions.EXT_blend_minmax;
 298    default:
 299       return GL_FALSE;
 300    }
 301 }
 302
 303
 304 /* This is really an extension function! */
 305 void GLAPIENTRY
 306 _mesa_BlendEquation( GLenum mode )
 307 {
 308    GLuint buf, numBuffers;
 309    GLboolean changed;
 310    GET_CURRENT_CONTEXT(ctx);
 311    ASSERT_OUTSIDE_BEGIN_END(ctx);
 312
 313    if (MESA_VERBOSE & VERBOSE_API)
 314       _mesa_debug(ctx, "glBlendEquation(%s)\n",
 315                   _mesa_lookup_enum_by_nr(mode));
 316
 317    if (!legal_blend_equation(ctx, mode)) {
 318       _mesa_error(ctx, GL_INVALID_ENUM, "glBlendEquation");
 319       return;
 320    }
 321
 322    numBuffers = ctx->Extensions.ARB_draw_buffers_blend
 323       ? ctx->Const.MaxDrawBuffers : 1;
 324
 325    changed = GL_FALSE;
 326    for (buf = 0; buf < numBuffers; buf++) {
 327       if (ctx->Color.Blend[buf].EquationRGB != mode ||
 328           ctx->Color.Blend[buf].EquationA != mode) {
 329          changed = GL_TRUE;
 330          break;
 331       }
 332    }
 333    if (!changed)
 334       return;
 335
 336    FLUSH_VERTICES(ctx, _NEW_COLOR);
 337    for (buf = 0; buf < numBuffers; buf++) {
 338       ctx->Color.Blend[buf].EquationRGB = mode;
 339       ctx->Color.Blend[buf].EquationA = mode;
 340    }
 341    ctx->Color._BlendEquationPerBuffer = GL_FALSE;
 342
 343    if (ctx->Driver.BlendEquationSeparate)
 344       (*ctx->Driver.BlendEquationSeparate)( ctx, mode, mode );
 345 }
 346
 347
 348 /**
 349  * Set blend equation for one color buffer/target.
 350  */
 351 void GLAPIENTRY
 352 _mesa_BlendEquationi(GLuint buf, GLenum mode)
 353 {
 354    GET_CURRENT_CONTEXT(ctx);
 355    ASSERT_OUTSIDE_BEGIN_END(ctx);
 356
 357    if (MESA_VERBOSE & VERBOSE_API)
 358       _mesa_debug(ctx, "glBlendEquationi(%u, %s)\n",
 359                   buf, _mesa_lookup_enum_by_nr(mode));
 360
 361    if (buf >= ctx->Const.MaxDrawBuffers) {
 362       _mesa_error(ctx, GL_INVALID_VALUE, "glBlendFuncSeparatei(buffer=%u)",
 363                   buf);
 364       return;
 365    }
 366
 367    if (!legal_blend_equation(ctx, mode)) {
 368       _mesa_error(ctx, GL_INVALID_ENUM, "glBlendEquationi");
 369       return;
 370    }
 371
 372    if (ctx->Color.Blend[buf].EquationRGB == mode &&
 373        ctx->Color.Blend[buf].EquationA == mode)
 374       return;  /* no change */
 375
 376    FLUSH_VERTICES(ctx, _NEW_COLOR);
 377    ctx->Color.Blend[buf].EquationRGB = mode;
 378    ctx->Color.Blend[buf].EquationA = mode;
 379    ctx->Color._BlendEquationPerBuffer = GL_TRUE;
 380
 381    if (ctx->Driver.BlendEquationSeparatei)
 382       ctx->Driver.BlendEquationSeparatei(ctx, buf, mode, mode);
 383 }
 384
 385
 386 void GLAPIENTRY
 387 _mesa_BlendEquationSeparateEXT( GLenum modeRGB, GLenum modeA )
 388 {
 389    GLuint buf, numBuffers;
 390    GLboolean changed;
 391    GET_CURRENT_CONTEXT(ctx);
 392    ASSERT_OUTSIDE_BEGIN_END(ctx);
 393
 394    if (MESA_VERBOSE & VERBOSE_API)
 395       _mesa_debug(ctx, "glBlendEquationSeparateEXT(%s %s)\n",
 396                   _mesa_lookup_enum_by_nr(modeRGB),
 397                   _mesa_lookup_enum_by_nr(modeA));
 398
 399    if ( (modeRGB != modeA) && !ctx->Extensions.EXT_blend_equation_separate ) {
 400       _mesa_error(ctx, GL_INVALID_OPERATION,
 401                   "glBlendEquationSeparateEXT not supported by driver");
 402       return;
 403    }
 404
 405    if (!legal_blend_equation(ctx, modeRGB)) {
 406       _mesa_error(ctx, GL_INVALID_ENUM, "glBlendEquationSeparateEXT(modeRGB)");
 407       return;
 408    }
 409
 410    if (!legal_blend_equation(ctx, modeA)) {
 411       _mesa_error(ctx, GL_INVALID_ENUM, "glBlendEquationSeparateEXT(modeA)");
 412       return;
 413    }
 414
 415    numBuffers = ctx->Extensions.ARB_draw_buffers_blend
 416       ? ctx->Const.MaxDrawBuffers : 1;
 417
 418    changed = GL_FALSE;
 419    for (buf = 0; buf < numBuffers; buf++) {
 420       if (ctx->Color.Blend[buf].EquationRGB != modeRGB ||
 421           ctx->Color.Blend[buf].EquationA != modeA) {
 422          changed = GL_TRUE;
 423          break;
 424       }
 425    }
 426    if (!changed)
 427       return;
 428
 429    FLUSH_VERTICES(ctx, _NEW_COLOR);
 430    for (buf = 0; buf < numBuffers; buf++) {
 431       ctx->Color.Blend[buf].EquationRGB = modeRGB;
 432       ctx->Color.Blend[buf].EquationA = modeA;
 433    }
 434    ctx->Color._BlendEquationPerBuffer = GL_FALSE;
 435
 436    if (ctx->Driver.BlendEquationSeparate)
 437       ctx->Driver.BlendEquationSeparate(ctx, modeRGB, modeA);
 438 }
 439
 440
 441 /**
 442  * Set separate blend equations for one color buffer/target.
 443  */
 444 void GLAPIENTRY
 445 _mesa_BlendEquationSeparatei(GLuint buf, GLenum modeRGB, GLenum modeA)
 446 {
 447    GET_CURRENT_CONTEXT(ctx);
 448    ASSERT_OUTSIDE_BEGIN_END(ctx);
 449
 450    if (MESA_VERBOSE & VERBOSE_API)
 451       _mesa_debug(ctx, "glBlendEquationSeparatei(%u, %s %s)\n", buf,
 452                   _mesa_lookup_enum_by_nr(modeRGB),
 453                   _mesa_lookup_enum_by_nr(modeA));
 454
 455    if (buf >= ctx->Const.MaxDrawBuffers) {
 456       _mesa_error(ctx, GL_INVALID_VALUE, "glBlendEquationSeparatei(buffer=%u)",
 457                   buf);
 458       return;
 459    }
 460
 461    if (!legal_blend_equation(ctx, modeRGB)) {
 462       _mesa_error(ctx, GL_INVALID_ENUM, "glBlendEquationSeparatei(modeRGB)");
 463       return;
 464    }
 465
 466    if (!legal_blend_equation(ctx, modeA)) {
 467       _mesa_error(ctx, GL_INVALID_ENUM, "glBlendEquationSeparatei(modeA)");
 468       return;
 469    }
 470
 471    if (ctx->Color.Blend[buf].EquationRGB == modeRGB &&
 472        ctx->Color.Blend[buf].EquationA == modeA)
 473       return;  /* no change */
 474
 475    FLUSH_VERTICES(ctx, _NEW_COLOR);
 476    ctx->Color.Blend[buf].EquationRGB = modeRGB;
 477    ctx->Color.Blend[buf].EquationA = modeA;
 478    ctx->Color._BlendEquationPerBuffer = GL_TRUE;
 479
 480    if (ctx->Driver.BlendEquationSeparatei)
 481       ctx->Driver.BlendEquationSeparatei(ctx, buf, modeRGB, modeA);
 482 }
 483
 484
 485
 486 #endif /* _HAVE_FULL_GL */
 487
 488
 489 /**
 490  * Set the blending color.
 491  *
 492  * \param red red color component.
 493  * \param green green color component.
 494  * \param blue blue color component.
 495  * \param alpha alpha color component.
 496  *
 497  * \sa glBlendColor().
 498  *
 499  * Clamps the parameters and updates gl_colorbuffer_attrib::BlendColor.  On a
 500  * change, flushes the vertices and notifies the driver via
 501  * dd_function_table::BlendColor callback.
 502  */
 503 void GLAPIENTRY
 504 _mesa_BlendColor( GLclampf red, GLclampf green, GLclampf blue, GLclampf alpha )
 505 {
 506    GLfloat tmp[4];
 507    GET_CURRENT_CONTEXT(ctx);
 508    ASSERT_OUTSIDE_BEGIN_END(ctx);
 509
 510    tmp[0] = red;
 511    tmp[1] = green;
 512    tmp[2] = blue;
 513    tmp[3] = alpha;
 514
 515    if (TEST_EQ_4V(tmp, ctx->Color.BlendColorUnclamped))
 516       return;
 517
 518    FLUSH_VERTICES(ctx, _NEW_COLOR);
 519    COPY_4FV( ctx->Color.BlendColorUnclamped, tmp );
 520
 521    ctx->Color.BlendColor[0] = CLAMP(tmp[0], 0.0F, 1.0F);
 522    ctx->Color.BlendColor[1] = CLAMP(tmp[1], 0.0F, 1.0F);
 523    ctx->Color.BlendColor[2] = CLAMP(tmp[2], 0.0F, 1.0F);
 524    ctx->Color.BlendColor[3] = CLAMP(tmp[3], 0.0F, 1.0F);
 525
 526    if (ctx->Driver.BlendColor)
 527       (*ctx->Driver.BlendColor)(ctx, ctx->Color.BlendColor);
 528 }
 529
 530
 531 /**
 532  * Specify the alpha test function.
 533  *
 534  * \param func alpha comparison function.
 535  * \param ref reference value.
 536  *
 537  * Verifies the parameters and updates gl_colorbuffer_attrib.
 538  * On a change, flushes the vertices and notifies the driver via
 539  * dd_function_table::AlphaFunc callback.
 540  */
 541 void GLAPIENTRY
 542 _mesa_AlphaFunc( GLenum func, GLclampf ref )
 543 {
 544    GET_CURRENT_CONTEXT(ctx);
 545    ASSERT_OUTSIDE_BEGIN_END(ctx);
 546
 547    if (MESA_VERBOSE & VERBOSE_API)
 548       _mesa_debug(ctx, "glAlphaFunc(%s, %f)\n",
 549                   _mesa_lookup_enum_by_nr(func), ref);
 550
 551    switch (func) {
 552    case GL_NEVER:
 553    case GL_LESS:
 554    case GL_EQUAL:
 555    case GL_LEQUAL:
 556    case GL_GREATER:
 557    case GL_NOTEQUAL:
 558    case GL_GEQUAL:
 559    case GL_ALWAYS:
 560       if (ctx->Color.AlphaFunc == func && ctx->Color.AlphaRefUnclamped == ref)
 561          return; /* no change */
 562
 563       FLUSH_VERTICES(ctx, _NEW_COLOR);
 564       ctx->Color.AlphaFunc = func;
 565       ctx->Color.AlphaRefUnclamped = ref;
 566       ctx->Color.AlphaRef = CLAMP(ref, 0.0F, 1.0F);
 567
 568       if (ctx->Driver.AlphaFunc)
 569          ctx->Driver.AlphaFunc(ctx, func, ctx->Color.AlphaRef);
 570       return;
 571
 572    default:
 573       _mesa_error( ctx, GL_INVALID_ENUM, "glAlphaFunc(func)" );
 574       return;
 575    }
 576 }
 577
 578
 579 /**
 580  * Specify a logic pixel operation for color index rendering.
 581  *
 582  * \param opcode operation.
 583  *
 584  * Verifies that \p opcode is a valid enum and updates
 585 gl_colorbuffer_attrib::LogicOp.
 586  * On a change, flushes the vertices and notifies the driver via the
 587  * dd_function_table::LogicOpcode callback.
 588  */
 589 void GLAPIENTRY
 590 _mesa_LogicOp( GLenum opcode )
 591 {
 592    GET_CURRENT_CONTEXT(ctx);
 593    ASSERT_OUTSIDE_BEGIN_END(ctx);
 594
 595    if (MESA_VERBOSE & VERBOSE_API)
 596       _mesa_debug(ctx, "glLogicOp(%s)\n", _mesa_lookup_enum_by_nr(opcode));
 597
 598    switch (opcode) {
 599       case GL_CLEAR:
 600       case GL_SET:
 601       case GL_COPY:
 602       case GL_COPY_INVERTED:
 603       case GL_NOOP:
 604       case GL_INVERT:
 605       case GL_AND:
 606       case GL_NAND:
 607       case GL_OR:
 608       case GL_NOR:
 609       case GL_XOR:
 610       case GL_EQUIV:
 611       case GL_AND_REVERSE:
 612       case GL_AND_INVERTED:
 613       case GL_OR_REVERSE:
 614       case GL_OR_INVERTED:
 615          break;
 616       default:
 617          _mesa_error( ctx, GL_INVALID_ENUM, "glLogicOp" );
 618          return;
 619    }
 620
 621    if (ctx->Color.LogicOp == opcode)
 622       return;
 623
 624    FLUSH_VERTICES(ctx, _NEW_COLOR);
 625    ctx->Color.LogicOp = opcode;
 626
 627    if (ctx->Driver.LogicOpcode)
 628       ctx->Driver.LogicOpcode( ctx, opcode );
 629 }
 630
 631 #if _HAVE_FULL_GL
 632 void GLAPIENTRY
 633 _mesa_IndexMask( GLuint mask )
 634 {
 635    GET_CURRENT_CONTEXT(ctx);
 636    ASSERT_OUTSIDE_BEGIN_END(ctx);
 637
 638    if (ctx->Color.IndexMask == mask)
 639       return;
 640
 641    FLUSH_VERTICES(ctx, _NEW_COLOR);
 642    ctx->Color.IndexMask = mask;
 643 }
 644 #endif
 645
 646
 647 /**
 648  * Enable or disable writing of frame buffer color components.
 649  *
 650  * \param red whether to mask writing of the red color component.
 651  * \param green whether to mask writing of the green color component.
 652  * \param blue whether to mask writing of the blue color component.
 653  * \param alpha whether to mask writing of the alpha color component.
 654  *
 655  * \sa glColorMask().
 656  *
 657  * Sets the appropriate value of gl_colorbuffer_attrib::ColorMask.  On a
 658  * change, flushes the vertices and notifies the driver via the
 659  * dd_function_table::ColorMask callback.
 660  */
 661 void GLAPIENTRY
 662 _mesa_ColorMask( GLboolean red, GLboolean green,
 663                  GLboolean blue, GLboolean alpha )
 664 {
 665    GET_CURRENT_CONTEXT(ctx);
 666    GLubyte tmp[4];
 667    GLuint i;
 668    GLboolean flushed;
 669    ASSERT_OUTSIDE_BEGIN_END(ctx);
 670
 671    if (MESA_VERBOSE & VERBOSE_API)
 672       _mesa_debug(ctx, "glColorMask(%d, %d, %d, %d)\n",
 673                   red, green, blue, alpha);
 674
 675    /* Shouldn't have any information about channel depth in core mesa
 676     * -- should probably store these as the native booleans:
 677     */
 678    tmp[RCOMP] = red    ? 0xff : 0x0;
 679    tmp[GCOMP] = green  ? 0xff : 0x0;
 680    tmp[BCOMP] = blue   ? 0xff : 0x0;
 681    tmp[ACOMP] = alpha  ? 0xff : 0x0;
 682
 683    flushed = GL_FALSE;
 684    for (i = 0; i < ctx->Const.MaxDrawBuffers; i++) {
 685       if (!TEST_EQ_4V(tmp, ctx->Color.ColorMask[i])) {
 686          if (!flushed) {
 687             FLUSH_VERTICES(ctx, _NEW_COLOR);
 688          }
 689          flushed = GL_TRUE;
 690          COPY_4UBV(ctx->Color.ColorMask[i], tmp);
 691       }
 692    }
 693
 694    if (ctx->Driver.ColorMask)
 695       ctx->Driver.ColorMask( ctx, red, green, blue, alpha );
 696 }
 697
 698
 699 /**
 700  * For GL_EXT_draw_buffers2 and GL3
 701  */
 702 void GLAPIENTRY
 703 _mesa_ColorMaskIndexed( GLuint buf, GLboolean red, GLboolean green,
 704                         GLboolean blue, GLboolean alpha )
 705 {
 706    GLubyte tmp[4];
 707    GET_CURRENT_CONTEXT(ctx);
 708    ASSERT_OUTSIDE_BEGIN_END(ctx);
 709
 710    if (MESA_VERBOSE & VERBOSE_API)
 711       _mesa_debug(ctx, "glColorMaskIndexed %u %d %d %d %d\n",
 712                   buf, red, green, blue, alpha);
 713
 714    if (buf >= ctx->Const.MaxDrawBuffers) {
 715       _mesa_error(ctx, GL_INVALID_VALUE, "glColorMaskIndexed(buf=%u)", buf);
 716       return;
 717    }
 718
 719    /* Shouldn't have any information about channel depth in core mesa
 720     * -- should probably store these as the native booleans:
 721     */
 722    tmp[RCOMP] = red    ? 0xff : 0x0;
 723    tmp[GCOMP] = green  ? 0xff : 0x0;
 724    tmp[BCOMP] = blue   ? 0xff : 0x0;
 725    tmp[ACOMP] = alpha  ? 0xff : 0x0;
 726
 727    if (TEST_EQ_4V(tmp, ctx->Color.ColorMask[buf]))
 728       return;
 729
 730    FLUSH_VERTICES(ctx, _NEW_COLOR);
 731    COPY_4UBV(ctx->Color.ColorMask[buf], tmp);
 732
 733    if (ctx->Driver.ColorMaskIndexed)
 734       ctx->Driver.ColorMaskIndexed(ctx, buf, red, green, blue, alpha);
 735 }
 736
 737
 738 void GLAPIENTRY
 739 _mesa_ClampColorARB(GLenum target, GLenum clamp)
 740 {
 741    GET_CURRENT_CONTEXT(ctx);
 742
 743    ASSERT_OUTSIDE_BEGIN_END(ctx);
 744
 745    if (clamp != GL_TRUE && clamp != GL_FALSE && clamp != GL_FIXED_ONLY_ARB) {
 746       _mesa_error(ctx, GL_INVALID_ENUM, "glClampColorARB(clamp)");
 747       return;
 748    }
 749
 750    switch (target) {
 751    case GL_CLAMP_VERTEX_COLOR_ARB:
 752       FLUSH_VERTICES(ctx, _NEW_LIGHT);
 753       ctx->Light.ClampVertexColor = clamp;
 754       break;
 755    case GL_CLAMP_FRAGMENT_COLOR_ARB:
 756       FLUSH_VERTICES(ctx, _NEW_FRAG_CLAMP);
 757       ctx->Color.ClampFragmentColor = clamp;
 758       break;
 759    case GL_CLAMP_READ_COLOR_ARB:
 760       FLUSH_VERTICES(ctx, _NEW_COLOR);
 761       ctx->Color.ClampReadColor = clamp;
 762       break;
 763    default:
 764       _mesa_error(ctx, GL_INVALID_ENUM, "glClampColorARB(target)");
 765       return;
 766    }
 767 }
 768
 769
 770
 771
 772 /**********************************************************************/
 773 /** \name Initialization */
 774 /*@{*/
 775
 776 /**
 777  * Initialization of the context's Color attribute group.
 778  *
 779  * \param ctx GL context.
 780  *
 781  * Initializes the related fields in the context color attribute group,
 782  * __struct gl_contextRec::Color.
 783  */
 784 void _mesa_init_color( struct gl_context * ctx )
 785 {
 786    GLuint i;
 787
 788    /* Color buffer group */
 789    ctx->Color.IndexMask = ~0u;
 790    memset(ctx->Color.ColorMask, 0xff, sizeof(ctx->Color.ColorMask));
 791    ctx->Color.ClearIndex = 0;
 792    ASSIGN_4V( ctx->Color.ClearColor.f, 0, 0, 0, 0 );
 793    ctx->Color.AlphaEnabled = GL_FALSE;
 794    ctx->Color.AlphaFunc = GL_ALWAYS;
 795    ctx->Color.AlphaRef = 0;
 796    ctx->Color.BlendEnabled = 0x0;
 797    for (i = 0; i < Elements(ctx->Color.Blend); i++) {
 798       ctx->Color.Blend[i].SrcRGB = GL_ONE;
 799       ctx->Color.Blend[i].DstRGB = GL_ZERO;
 800       ctx->Color.Blend[i].SrcA = GL_ONE;
 801       ctx->Color.Blend[i].DstA = GL_ZERO;
 802       ctx->Color.Blend[i].EquationRGB = GL_FUNC_ADD;
 803       ctx->Color.Blend[i].EquationA = GL_FUNC_ADD;
 804    }
 805    ASSIGN_4V( ctx->Color.BlendColor, 0.0, 0.0, 0.0, 0.0 );
 806    ASSIGN_4V( ctx->Color.BlendColorUnclamped, 0.0, 0.0, 0.0, 0.0 );
 807    ctx->Color.IndexLogicOpEnabled = GL_FALSE;
 808    ctx->Color.ColorLogicOpEnabled = GL_FALSE;
 809    ctx->Color.LogicOp = GL_COPY;
 810    ctx->Color.DitherFlag = GL_TRUE;
 811
 812    if (ctx->Visual.doubleBufferMode) {
 813       ctx->Color.DrawBuffer[0] = GL_BACK;
 814    }
 815    else {
 816       ctx->Color.DrawBuffer[0] = GL_FRONT;
 817    }
 818
 819    ctx->Color.ClampFragmentColor = GL_FIXED_ONLY_ARB;
 820    ctx->Color._ClampFragmentColor = GL_TRUE;
 821    ctx->Color.ClampReadColor = GL_FIXED_ONLY_ARB;
 822    ctx->Color._ClampReadColor = GL_TRUE;
 823 }
 824
 825 /*@}*/