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       return GL_TRUE;
 293    case GL_MIN:
 294    case GL_MAX:
 295       return ctx->Extensions.EXT_blend_minmax;
 296    case GL_FUNC_SUBTRACT:
 297    case GL_FUNC_REVERSE_SUBTRACT:
 298       return ctx->Extensions.EXT_blend_subtract;
 299    default:
 300       return GL_FALSE;
 301    }
 302 }
 303
 304
 305 /* This is really an extension function! */
 306 void GLAPIENTRY
 307 _mesa_BlendEquation( GLenum mode )
 308 {
 309    GLuint buf, numBuffers;
 310    GLboolean changed;
 311    GET_CURRENT_CONTEXT(ctx);
 312    ASSERT_OUTSIDE_BEGIN_END(ctx);
 313
 314    if (MESA_VERBOSE & VERBOSE_API)
 315       _mesa_debug(ctx, "glBlendEquation(%s)\n",
 316                   _mesa_lookup_enum_by_nr(mode));
 317
 318    if (!legal_blend_equation(ctx, mode)) {
 319       _mesa_error(ctx, GL_INVALID_ENUM, "glBlendEquation");
 320       return;
 321    }
 322
 323    numBuffers = ctx->Extensions.ARB_draw_buffers_blend
 324       ? ctx->Const.MaxDrawBuffers : 1;
 325
 326    changed = GL_FALSE;
 327    for (buf = 0; buf < numBuffers; buf++) {
 328       if (ctx->Color.Blend[buf].EquationRGB != mode ||
 329           ctx->Color.Blend[buf].EquationA != mode) {
 330          changed = GL_TRUE;
 331          break;
 332       }
 333    }
 334    if (!changed)
 335       return;
 336
 337    FLUSH_VERTICES(ctx, _NEW_COLOR);
 338    for (buf = 0; buf < numBuffers; buf++) {
 339       ctx->Color.Blend[buf].EquationRGB = mode;
 340       ctx->Color.Blend[buf].EquationA = mode;
 341    }
 342    ctx->Color._BlendEquationPerBuffer = GL_FALSE;
 343
 344    if (ctx->Driver.BlendEquationSeparate)
 345       (*ctx->Driver.BlendEquationSeparate)( ctx, mode, mode );
 346 }
 347
 348
 349 /**
 350  * Set blend equation for one color buffer/target.
 351  */
 352 void GLAPIENTRY
 353 _mesa_BlendEquationi(GLuint buf, GLenum mode)
 354 {
 355    GET_CURRENT_CONTEXT(ctx);
 356    ASSERT_OUTSIDE_BEGIN_END(ctx);
 357
 358    if (MESA_VERBOSE & VERBOSE_API)
 359       _mesa_debug(ctx, "glBlendEquationi(%u, %s)\n",
 360                   buf, _mesa_lookup_enum_by_nr(mode));
 361
 362    if (buf >= ctx->Const.MaxDrawBuffers) {
 363       _mesa_error(ctx, GL_INVALID_VALUE, "glBlendFuncSeparatei(buffer=%u)",
 364                   buf);
 365       return;
 366    }
 367
 368    if (!legal_blend_equation(ctx, mode)) {
 369       _mesa_error(ctx, GL_INVALID_ENUM, "glBlendEquationi");
 370       return;
 371    }
 372
 373    if (ctx->Color.Blend[buf].EquationRGB == mode &&
 374        ctx->Color.Blend[buf].EquationA == mode)
 375       return;  /* no change */
 376
 377    FLUSH_VERTICES(ctx, _NEW_COLOR);
 378    ctx->Color.Blend[buf].EquationRGB = mode;
 379    ctx->Color.Blend[buf].EquationA = mode;
 380    ctx->Color._BlendEquationPerBuffer = GL_TRUE;
 381
 382    if (ctx->Driver.BlendEquationSeparatei)
 383       ctx->Driver.BlendEquationSeparatei(ctx, buf, mode, mode);
 384 }
 385
 386
 387 void GLAPIENTRY
 388 _mesa_BlendEquationSeparateEXT( GLenum modeRGB, GLenum modeA )
 389 {
 390    GLuint buf, numBuffers;
 391    GLboolean changed;
 392    GET_CURRENT_CONTEXT(ctx);
 393    ASSERT_OUTSIDE_BEGIN_END(ctx);
 394
 395    if (MESA_VERBOSE & VERBOSE_API)
 396       _mesa_debug(ctx, "glBlendEquationSeparateEXT(%s %s)\n",
 397                   _mesa_lookup_enum_by_nr(modeRGB),
 398                   _mesa_lookup_enum_by_nr(modeA));
 399
 400    if ( (modeRGB != modeA) && !ctx->Extensions.EXT_blend_equation_separate ) {
 401       _mesa_error(ctx, GL_INVALID_OPERATION,
 402                   "glBlendEquationSeparateEXT not supported by driver");
 403       return;
 404    }
 405
 406    if (!legal_blend_equation(ctx, modeRGB)) {
 407       _mesa_error(ctx, GL_INVALID_ENUM, "glBlendEquationSeparateEXT(modeRGB)");
 408       return;
 409    }
 410
 411    if (!legal_blend_equation(ctx, modeA)) {
 412       _mesa_error(ctx, GL_INVALID_ENUM, "glBlendEquationSeparateEXT(modeA)");
 413       return;
 414    }
 415
 416    numBuffers = ctx->Extensions.ARB_draw_buffers_blend
 417       ? ctx->Const.MaxDrawBuffers : 1;
 418
 419    changed = GL_FALSE;
 420    for (buf = 0; buf < numBuffers; buf++) {
 421       if (ctx->Color.Blend[buf].EquationRGB != modeRGB ||
 422           ctx->Color.Blend[buf].EquationA != modeA) {
 423          changed = GL_TRUE;
 424          break;
 425       }
 426    }
 427    if (!changed)
 428       return;
 429
 430    FLUSH_VERTICES(ctx, _NEW_COLOR);
 431    for (buf = 0; buf < numBuffers; buf++) {
 432       ctx->Color.Blend[buf].EquationRGB = modeRGB;
 433       ctx->Color.Blend[buf].EquationA = modeA;
 434    }
 435    ctx->Color._BlendEquationPerBuffer = GL_FALSE;
 436
 437    if (ctx->Driver.BlendEquationSeparate)
 438       ctx->Driver.BlendEquationSeparate(ctx, modeRGB, modeA);
 439 }
 440
 441
 442 /**
 443  * Set separate blend equations for one color buffer/target.
 444  */
 445 void GLAPIENTRY
 446 _mesa_BlendEquationSeparatei(GLuint buf, GLenum modeRGB, GLenum modeA)
 447 {
 448    GET_CURRENT_CONTEXT(ctx);
 449    ASSERT_OUTSIDE_BEGIN_END(ctx);
 450
 451    if (MESA_VERBOSE & VERBOSE_API)
 452       _mesa_debug(ctx, "glBlendEquationSeparatei(%u, %s %s)\n", buf,
 453                   _mesa_lookup_enum_by_nr(modeRGB),
 454                   _mesa_lookup_enum_by_nr(modeA));
 455
 456    if (buf >= ctx->Const.MaxDrawBuffers) {
 457       _mesa_error(ctx, GL_INVALID_VALUE, "glBlendEquationSeparatei(buffer=%u)",
 458                   buf);
 459       return;
 460    }
 461
 462    if (!legal_blend_equation(ctx, modeRGB)) {
 463       _mesa_error(ctx, GL_INVALID_ENUM, "glBlendEquationSeparatei(modeRGB)");
 464       return;
 465    }
 466
 467    if (!legal_blend_equation(ctx, modeA)) {
 468       _mesa_error(ctx, GL_INVALID_ENUM, "glBlendEquationSeparatei(modeA)");
 469       return;
 470    }
 471
 472    if (ctx->Color.Blend[buf].EquationRGB == modeRGB &&
 473        ctx->Color.Blend[buf].EquationA == modeA)
 474       return;  /* no change */
 475
 476    FLUSH_VERTICES(ctx, _NEW_COLOR);
 477    ctx->Color.Blend[buf].EquationRGB = modeRGB;
 478    ctx->Color.Blend[buf].EquationA = modeA;
 479    ctx->Color._BlendEquationPerBuffer = GL_TRUE;
 480
 481    if (ctx->Driver.BlendEquationSeparatei)
 482       ctx->Driver.BlendEquationSeparatei(ctx, buf, modeRGB, modeA);
 483 }
 484
 485
 486
 487 #endif /* _HAVE_FULL_GL */
 488
 489
 490 /**
 491  * Set the blending color.
 492  *
 493  * \param red red color component.
 494  * \param green green color component.
 495  * \param blue blue color component.
 496  * \param alpha alpha color component.
 497  *
 498  * \sa glBlendColor().
 499  *
 500  * Clamps the parameters and updates gl_colorbuffer_attrib::BlendColor.  On a
 501  * change, flushes the vertices and notifies the driver via
 502  * dd_function_table::BlendColor callback.
 503  */
 504 void GLAPIENTRY
 505 _mesa_BlendColor( GLclampf red, GLclampf green, GLclampf blue, GLclampf alpha )
 506 {
 507    GLfloat tmp[4];
 508    GET_CURRENT_CONTEXT(ctx);
 509    ASSERT_OUTSIDE_BEGIN_END(ctx);
 510
 511    tmp[0] = red;
 512    tmp[1] = green;
 513    tmp[2] = blue;
 514    tmp[3] = alpha;
 515
 516    if (TEST_EQ_4V(tmp, ctx->Color.BlendColorUnclamped))
 517       return;
 518
 519    FLUSH_VERTICES(ctx, _NEW_COLOR);
 520    COPY_4FV( ctx->Color.BlendColorUnclamped, tmp );
 521
 522    ctx->Color.BlendColor[0] = CLAMP(tmp[0], 0.0F, 1.0F);
 523    ctx->Color.BlendColor[1] = CLAMP(tmp[1], 0.0F, 1.0F);
 524    ctx->Color.BlendColor[2] = CLAMP(tmp[2], 0.0F, 1.0F);
 525    ctx->Color.BlendColor[3] = CLAMP(tmp[3], 0.0F, 1.0F);
 526
 527    if (ctx->Driver.BlendColor)
 528       (*ctx->Driver.BlendColor)(ctx, ctx->Color.BlendColor);
 529 }
 530
 531
 532 /**
 533  * Specify the alpha test function.
 534  *
 535  * \param func alpha comparison function.
 536  * \param ref reference value.
 537  *
 538  * Verifies the parameters and updates gl_colorbuffer_attrib.
 539  * On a change, flushes the vertices and notifies the driver via
 540  * dd_function_table::AlphaFunc callback.
 541  */
 542 void GLAPIENTRY
 543 _mesa_AlphaFunc( GLenum func, GLclampf ref )
 544 {
 545    GET_CURRENT_CONTEXT(ctx);
 546    ASSERT_OUTSIDE_BEGIN_END(ctx);
 547
 548    if (MESA_VERBOSE & VERBOSE_API)
 549       _mesa_debug(ctx, "glAlphaFunc(%s, %f)\n",
 550                   _mesa_lookup_enum_by_nr(func), ref);
 551
 552    switch (func) {
 553    case GL_NEVER:
 554    case GL_LESS:
 555    case GL_EQUAL:
 556    case GL_LEQUAL:
 557    case GL_GREATER:
 558    case GL_NOTEQUAL:
 559    case GL_GEQUAL:
 560    case GL_ALWAYS:
 561       if (ctx->Color.AlphaFunc == func && ctx->Color.AlphaRefUnclamped == ref)
 562          return; /* no change */
 563
 564       FLUSH_VERTICES(ctx, _NEW_COLOR);
 565       ctx->Color.AlphaFunc = func;
 566       ctx->Color.AlphaRefUnclamped = ref;
 567       ctx->Color.AlphaRef = CLAMP(ref, 0.0F, 1.0F);
 568
 569       if (ctx->Driver.AlphaFunc)
 570          ctx->Driver.AlphaFunc(ctx, func, ctx->Color.AlphaRef);
 571       return;
 572
 573    default:
 574       _mesa_error( ctx, GL_INVALID_ENUM, "glAlphaFunc(func)" );
 575       return;
 576    }
 577 }
 578
 579
 580 /**
 581  * Specify a logic pixel operation for color index rendering.
 582  *
 583  * \param opcode operation.
 584  *
 585  * Verifies that \p opcode is a valid enum and updates
 586 gl_colorbuffer_attrib::LogicOp.
 587  * On a change, flushes the vertices and notifies the driver via the
 588  * dd_function_table::LogicOpcode callback.
 589  */
 590 void GLAPIENTRY
 591 _mesa_LogicOp( GLenum opcode )
 592 {
 593    GET_CURRENT_CONTEXT(ctx);
 594    ASSERT_OUTSIDE_BEGIN_END(ctx);
 595
 596    if (MESA_VERBOSE & VERBOSE_API)
 597       _mesa_debug(ctx, "glLogicOp(%s)\n", _mesa_lookup_enum_by_nr(opcode));
 598
 599    switch (opcode) {
 600       case GL_CLEAR:
 601       case GL_SET:
 602       case GL_COPY:
 603       case GL_COPY_INVERTED:
 604       case GL_NOOP:
 605       case GL_INVERT:
 606       case GL_AND:
 607       case GL_NAND:
 608       case GL_OR:
 609       case GL_NOR:
 610       case GL_XOR:
 611       case GL_EQUIV:
 612       case GL_AND_REVERSE:
 613       case GL_AND_INVERTED:
 614       case GL_OR_REVERSE:
 615       case GL_OR_INVERTED:
 616          break;
 617       default:
 618          _mesa_error( ctx, GL_INVALID_ENUM, "glLogicOp" );
 619          return;
 620    }
 621
 622    if (ctx->Color.LogicOp == opcode)
 623       return;
 624
 625    FLUSH_VERTICES(ctx, _NEW_COLOR);
 626    ctx->Color.LogicOp = opcode;
 627
 628    if (ctx->Driver.LogicOpcode)
 629       ctx->Driver.LogicOpcode( ctx, opcode );
 630 }
 631
 632 #if _HAVE_FULL_GL
 633 void GLAPIENTRY
 634 _mesa_IndexMask( GLuint mask )
 635 {
 636    GET_CURRENT_CONTEXT(ctx);
 637    ASSERT_OUTSIDE_BEGIN_END(ctx);
 638
 639    if (ctx->Color.IndexMask == mask)
 640       return;
 641
 642    FLUSH_VERTICES(ctx, _NEW_COLOR);
 643    ctx->Color.IndexMask = mask;
 644 }
 645 #endif
 646
 647
 648 /**
 649  * Enable or disable writing of frame buffer color components.
 650  *
 651  * \param red whether to mask writing of the red color component.
 652  * \param green whether to mask writing of the green color component.
 653  * \param blue whether to mask writing of the blue color component.
 654  * \param alpha whether to mask writing of the alpha color component.
 655  *
 656  * \sa glColorMask().
 657  *
 658  * Sets the appropriate value of gl_colorbuffer_attrib::ColorMask.  On a
 659  * change, flushes the vertices and notifies the driver via the
 660  * dd_function_table::ColorMask callback.
 661  */
 662 void GLAPIENTRY
 663 _mesa_ColorMask( GLboolean red, GLboolean green,
 664                  GLboolean blue, GLboolean alpha )
 665 {
 666    GET_CURRENT_CONTEXT(ctx);
 667    GLubyte tmp[4];
 668    GLuint i;
 669    GLboolean flushed;
 670    ASSERT_OUTSIDE_BEGIN_END(ctx);
 671
 672    if (MESA_VERBOSE & VERBOSE_API)
 673       _mesa_debug(ctx, "glColorMask(%d, %d, %d, %d)\n",
 674                   red, green, blue, alpha);
 675
 676    /* Shouldn't have any information about channel depth in core mesa
 677     * -- should probably store these as the native booleans:
 678     */
 679    tmp[RCOMP] = red    ? 0xff : 0x0;
 680    tmp[GCOMP] = green  ? 0xff : 0x0;
 681    tmp[BCOMP] = blue   ? 0xff : 0x0;
 682    tmp[ACOMP] = alpha  ? 0xff : 0x0;
 683
 684    flushed = GL_FALSE;
 685    for (i = 0; i < ctx->Const.MaxDrawBuffers; i++) {
 686       if (!TEST_EQ_4V(tmp, ctx->Color.ColorMask[i])) {
 687          if (!flushed) {
 688             FLUSH_VERTICES(ctx, _NEW_COLOR);
 689          }
 690          flushed = GL_TRUE;
 691          COPY_4UBV(ctx->Color.ColorMask[i], tmp);
 692       }
 693    }
 694
 695    if (ctx->Driver.ColorMask)
 696       ctx->Driver.ColorMask( ctx, red, green, blue, alpha );
 697 }
 698
 699
 700 /**
 701  * For GL_EXT_draw_buffers2 and GL3
 702  */
 703 void GLAPIENTRY
 704 _mesa_ColorMaskIndexed( GLuint buf, GLboolean red, GLboolean green,
 705                         GLboolean blue, GLboolean alpha )
 706 {
 707    GLubyte tmp[4];
 708    GET_CURRENT_CONTEXT(ctx);
 709    ASSERT_OUTSIDE_BEGIN_END(ctx);
 710
 711    if (MESA_VERBOSE & VERBOSE_API)
 712       _mesa_debug(ctx, "glColorMaskIndexed %u %d %d %d %d\n",
 713                   buf, red, green, blue, alpha);
 714
 715    if (buf >= ctx->Const.MaxDrawBuffers) {
 716       _mesa_error(ctx, GL_INVALID_VALUE, "glColorMaskIndexed(buf=%u)", buf);
 717       return;
 718    }
 719
 720    /* Shouldn't have any information about channel depth in core mesa
 721     * -- should probably store these as the native booleans:
 722     */
 723    tmp[RCOMP] = red    ? 0xff : 0x0;
 724    tmp[GCOMP] = green  ? 0xff : 0x0;
 725    tmp[BCOMP] = blue   ? 0xff : 0x0;
 726    tmp[ACOMP] = alpha  ? 0xff : 0x0;
 727
 728    if (TEST_EQ_4V(tmp, ctx->Color.ColorMask[buf]))
 729       return;
 730
 731    FLUSH_VERTICES(ctx, _NEW_COLOR);
 732    COPY_4UBV(ctx->Color.ColorMask[buf], tmp);
 733
 734    if (ctx->Driver.ColorMaskIndexed)
 735       ctx->Driver.ColorMaskIndexed(ctx, buf, red, green, blue, alpha);
 736 }
 737
 738
 739 void GLAPIENTRY
 740 _mesa_ClampColorARB(GLenum target, GLenum clamp)
 741 {
 742    GET_CURRENT_CONTEXT(ctx);
 743
 744    ASSERT_OUTSIDE_BEGIN_END(ctx);
 745
 746    if (clamp != GL_TRUE && clamp != GL_FALSE && clamp != GL_FIXED_ONLY_ARB) {
 747       _mesa_error(ctx, GL_INVALID_ENUM, "glClampColorARB(clamp)");
 748       return;
 749    }
 750
 751    switch (target) {
 752    case GL_CLAMP_VERTEX_COLOR_ARB:
 753       FLUSH_VERTICES(ctx, _NEW_LIGHT);
 754       ctx->Light.ClampVertexColor = clamp;
 755       break;
 756    case GL_CLAMP_FRAGMENT_COLOR_ARB:
 757       FLUSH_VERTICES(ctx, _NEW_FRAG_CLAMP);
 758       ctx->Color.ClampFragmentColor = clamp;
 759       break;
 760    case GL_CLAMP_READ_COLOR_ARB:
 761       FLUSH_VERTICES(ctx, _NEW_COLOR);
 762       ctx->Color.ClampReadColor = clamp;
 763       break;
 764    default:
 765       _mesa_error(ctx, GL_INVALID_ENUM, "glClampColorARB(target)");
 766       return;
 767    }
 768 }
 769
 770
 771
 772
 773 /**********************************************************************/
 774 /** \name Initialization */
 775 /*@{*/
 776
 777 /**
 778  * Initialization of the context's Color attribute group.
 779  *
 780  * \param ctx GL context.
 781  *
 782  * Initializes the related fields in the context color attribute group,
 783  * __struct gl_contextRec::Color.
 784  */
 785 void _mesa_init_color( struct gl_context * ctx )
 786 {
 787    GLuint i;
 788
 789    /* Color buffer group */
 790    ctx->Color.IndexMask = ~0u;
 791    memset(ctx->Color.ColorMask, 0xff, sizeof(ctx->Color.ColorMask));
 792    ctx->Color.ClearIndex = 0;
 793    ASSIGN_4V( ctx->Color.ClearColor.f, 0, 0, 0, 0 );
 794    ctx->Color.AlphaEnabled = GL_FALSE;
 795    ctx->Color.AlphaFunc = GL_ALWAYS;
 796    ctx->Color.AlphaRef = 0;
 797    ctx->Color.BlendEnabled = 0x0;
 798    for (i = 0; i < Elements(ctx->Color.Blend); i++) {
 799       ctx->Color.Blend[i].SrcRGB = GL_ONE;
 800       ctx->Color.Blend[i].DstRGB = GL_ZERO;
 801       ctx->Color.Blend[i].SrcA = GL_ONE;
 802       ctx->Color.Blend[i].DstA = GL_ZERO;
 803       ctx->Color.Blend[i].EquationRGB = GL_FUNC_ADD;
 804       ctx->Color.Blend[i].EquationA = GL_FUNC_ADD;
 805    }
 806    ASSIGN_4V( ctx->Color.BlendColor, 0.0, 0.0, 0.0, 0.0 );
 807    ASSIGN_4V( ctx->Color.BlendColorUnclamped, 0.0, 0.0, 0.0, 0.0 );
 808    ctx->Color.IndexLogicOpEnabled = GL_FALSE;
 809    ctx->Color.ColorLogicOpEnabled = GL_FALSE;
 810    ctx->Color._LogicOpEnabled = GL_FALSE;
 811    ctx->Color.LogicOp = GL_COPY;
 812    ctx->Color.DitherFlag = GL_TRUE;
 813
 814    if (ctx->Visual.doubleBufferMode) {
 815       ctx->Color.DrawBuffer[0] = GL_BACK;
 816    }
 817    else {
 818       ctx->Color.DrawBuffer[0] = GL_FRONT;
 819    }
 820
 821    ctx->Color.ClampFragmentColor = GL_FIXED_ONLY_ARB;
 822    ctx->Color._ClampFragmentColor = GL_TRUE;
 823    ctx->Color.ClampReadColor = GL_FIXED_ONLY_ARB;
 824    ctx->Color._ClampReadColor = GL_TRUE;
 825 }
 826
 827 /*@}*/