src/mesa/drivers/dri/mga/mga_texstate.c

   1 /*
   2  * Copyright 2000-2001 VA Linux Systems, Inc.
   3  * (c) Copyright IBM Corporation 2002
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the "Software"),
   8  * to deal in the Software without restriction, including without limitation
   9  * on the rights to use, copy, modify, merge, publish, distribute, sub
  10  * license, and/or sell copies of the Software, and to permit persons to whom
  11  * the Software is furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice (including the next
  14  * paragraph) shall be included in all copies or substantial portions of the
  15  * Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.  IN NO EVENT SHALL
  20  * VA LINUX SYSTEMS, IBM AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
  21  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  22  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  23  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  24  *
  25  * Authors:
  26  *    Ian Romanick <idr@us.ibm.com>
  27  *    Keith Whitwell <keithw@tungstengraphics.com>
  28  */
  29
  30 #include "main/context.h"
  31 #include "main/enums.h"
  32 #include "main/macros.h"
  33 #include "main/mm.h"
  34 #include "main/imports.h"
  35 #include "main/simple_list.h"
  36
  37 #include "mgacontext.h"
  38 #include "mgatex.h"
  39 #include "mgaregs.h"
  40 #include "mgatris.h"
  41 #include "mgaioctl.h"
  42
  43 #define MGA_USE_TABLE_FOR_FORMAT
  44 #ifdef MGA_USE_TABLE_FOR_FORMAT
  45 #define TMC_nr_tformat (MESA_FORMAT_YCBCR_REV + 1)
  46 static const unsigned TMC_tformat[ TMC_nr_tformat ] =
  47 {
  48     [MESA_FORMAT_ARGB8888] = TMC_tformat_tw32,
  49     [MESA_FORMAT_RGB565]   = TMC_tformat_tw16,
  50     [MESA_FORMAT_ARGB4444] = TMC_tformat_tw12,
  51     [MESA_FORMAT_ARGB1555] = TMC_tformat_tw15,
  52     [MESA_FORMAT_AL88]     = TMC_tformat_tw8al,
  53     [MESA_FORMAT_I8]       = TMC_tformat_tw8a,
  54     [MESA_FORMAT_CI8]      = TMC_tformat_tw8 ,
  55     [MESA_FORMAT_YCBCR]     = TMC_tformat_tw422uyvy,
  56     [MESA_FORMAT_YCBCR_REV] = TMC_tformat_tw422,
  57 };
  58 #endif
  59
  60 static void
  61 mgaSetTexImages( mgaContextPtr mmesa,
  62                  const struct gl_texture_object * tObj )
  63 {
  64     mgaTextureObjectPtr t = (mgaTextureObjectPtr) tObj->DriverData;
  65     struct gl_texture_image *baseImage = tObj->Image[0][ tObj->BaseLevel ];
  66     GLint totalSize;
  67     GLint width, height;
  68     GLint i;
  69     GLint numLevels;
  70     GLint log2Width, log2Height;
  71     GLuint txformat = 0;
  72     GLint ofs;
  73
  74     /* Set the hardware texture format
  75      */
  76 #ifndef MGA_USE_TABLE_FOR_FORMAT
  77     switch (baseImage->TexFormat->MesaFormat) {
  78
  79         case MESA_FORMAT_ARGB8888: txformat = TMC_tformat_tw32; break;
  80         case MESA_FORMAT_RGB565:   txformat = TMC_tformat_tw16; break;
  81         case MESA_FORMAT_ARGB4444: txformat = TMC_tformat_tw12; break;
  82         case MESA_FORMAT_ARGB1555: txformat = TMC_tformat_tw15; break;
  83         case MESA_FORMAT_AL88:     txformat = TMC_tformat_tw8al; break;
  84         case MESA_FORMAT_I8:       txformat = TMC_tformat_tw8a; break;
  85         case MESA_FORMAT_CI8:      txformat = TMC_tformat_tw8;  break;
  86         case MESA_FORMAT_YCBCR:    txformat  = TMC_tformat_tw422uyvy; break;
  87         case MESA_FORMAT_YCBCR_REV: txformat = TMC_tformat_tw422; break;
  88
  89         default:
  90         _mesa_problem(NULL, "unexpected texture format in %s", __FUNCTION__);
  91         return;
  92     }
  93 #else
  94     if ( (baseImage->TexFormat >= TMC_nr_tformat)
  95          || (TMC_tformat[ baseImage->TexFormat ] == 0) )
  96     {
  97         _mesa_problem(NULL, "unexpected texture format in %s", __FUNCTION__);
  98         return;
  99     }
 100
 101     txformat = TMC_tformat[ baseImage->TexFormat ];
 102
 103 #endif /* MGA_USE_TABLE_FOR_FORMAT */
 104
 105    driCalculateTextureFirstLastLevel( (driTextureObject *) t );
 106    if (tObj->Target == GL_TEXTURE_RECTANGLE_NV) {
 107       log2Width = 0;
 108       log2Height = 0;
 109    } else {
 110       log2Width  = tObj->Image[0][t->base.firstLevel]->WidthLog2;
 111       log2Height = tObj->Image[0][t->base.firstLevel]->HeightLog2;
 112    }
 113
 114    width = tObj->Image[0][t->base.firstLevel]->Width;
 115    height = tObj->Image[0][t->base.firstLevel]->Height;
 116
 117    numLevels = MIN2( t->base.lastLevel - t->base.firstLevel + 1,
 118                      MGA_IS_G200(mmesa) ? G200_TEX_MAXLEVELS : G400_TEX_MAXLEVELS);
 119
 120
 121    totalSize = 0;
 122    for ( i = 0 ; i < numLevels ; i++ ) {
 123       const struct gl_texture_image * const texImage =
 124           tObj->Image[0][ i + t->base.firstLevel ];
 125       int size;
 126
 127       if (texImage == NULL)
 128          break;
 129
 130       size = texImage->Width * texImage->Height *
 131          _mesa_get_format_bytes(baseImage->TexFormat);
 132
 133       t->offsets[i] = totalSize;
 134       t->base.dirty_images[0] |= (1<<i);
 135
 136       /* All mipmaps must be 32-byte aligned */
 137       totalSize += (size + 31) & ~31;
 138
 139       /* Since G400 calculates the offsets in hardware
 140        * it can't handle more than one < 32 byte mipmap.
 141        *
 142        * Further testing has indicated that it can't
 143        * handle any < 32 byte mipmaps.
 144        */
 145       if (MGA_IS_G400( mmesa ) && size <= 32) {
 146          i++;
 147          break;
 148       }
 149    }
 150
 151    /* save these values */
 152    numLevels = i;
 153    t->base.lastLevel = t->base.firstLevel + numLevels - 1;
 154    t->base.totalSize = totalSize;
 155
 156    /* setup hardware register values */
 157    t->setup.texctl &= (TMC_tformat_MASK & TMC_tpitch_MASK
 158                        & TMC_tpitchext_MASK);
 159    t->setup.texctl |= txformat;
 160
 161
 162    /* Set the texture width.  In order to support non-power of 2 textures and
 163     * textures larger than 1024 texels wide, "linear" pitch must be used.  For
 164     * the linear pitch, if the width is 2048, a value of zero is used.
 165     */
 166
 167    t->setup.texctl |= TMC_tpitchlin_enable;
 168    t->setup.texctl |= MGA_FIELD( TMC_tpitchext, width & (2048 - 1) );
 169
 170
 171    /* G400 specifies the number of mip levels in a strange way.  Since there
 172     * are up to 11 levels, it requires 4 bits.  Three of the bits are at the
 173     * high end of TEXFILTER.  The other bit is in the middle.  Weird.
 174     */
 175    numLevels--;
 176    t->setup.texfilter &= TF_mapnb_MASK & TF_mapnbhigh_MASK & TF_reserved_MASK;
 177    t->setup.texfilter |= MGA_FIELD( TF_mapnb, numLevels & 0x7 );
 178    t->setup.texfilter |= MGA_FIELD( TF_mapnbhigh, (numLevels >> 3) & 0x1 );
 179
 180    /* warp texture registers */
 181    ofs = MGA_IS_G200(mmesa) ? 28 : 11;
 182
 183    t->setup.texwidth = (MGA_FIELD(TW_twmask, width - 1) |
 184                         MGA_FIELD(TW_rfw, (10 - log2Width - 8) & 63 ) |
 185                         MGA_FIELD(TW_tw, (log2Width + ofs ) | 0x40 ));
 186
 187    t->setup.texheight = (MGA_FIELD(TH_thmask, height - 1) |
 188                          MGA_FIELD(TH_rfh, (10 - log2Height - 8) & 63 ) |
 189                          MGA_FIELD(TH_th, (log2Height + ofs ) | 0x40 ));
 190
 191    mgaUploadTexImages( mmesa, t );
 192 }
 193
 194
 195 /* ================================================================
 196  * Texture unit state management
 197  */
 198
 199 static void mgaUpdateTextureEnvG200( GLcontext *ctx, GLuint unit )
 200 {
 201    mgaContextPtr mmesa = MGA_CONTEXT(ctx);
 202    struct gl_texture_object *tObj = ctx->Texture.Unit[0]._Current;
 203    mgaTextureObjectPtr t = (mgaTextureObjectPtr) tObj->DriverData;
 204    GLenum format = tObj->Image[0][tObj->BaseLevel]->_BaseFormat;
 205
 206    if (tObj != ctx->Texture.Unit[0].CurrentTex[TEXTURE_2D_INDEX] &&
 207        tObj != ctx->Texture.Unit[0].CurrentTex[TEXTURE_RECT_INDEX])
 208       return;
 209
 210
 211    t->setup.texctl &= ~TMC_tmodulate_enable;
 212    t->setup.texctl2 &= ~(TMC_decalblend_enable |
 213                          TMC_idecal_enable |
 214                          TMC_decaldis_enable);
 215
 216    switch (ctx->Texture.Unit[0].EnvMode) {
 217    case GL_REPLACE:
 218       if (format == GL_ALPHA)
 219          t->setup.texctl2 |= TMC_idecal_enable;
 220
 221       if (format == GL_RGB || format == GL_LUMINANCE)
 222          mmesa->hw.alpha_sel = AC_alphasel_diffused;
 223       else
 224          mmesa->hw.alpha_sel = AC_alphasel_fromtex;
 225       break;
 226
 227    case GL_MODULATE:
 228       t->setup.texctl |= TMC_tmodulate_enable;
 229
 230       if (format == GL_ALPHA)
 231          t->setup.texctl2 |= (TMC_idecal_enable |
 232                               TMC_decaldis_enable);
 233
 234       if (format == GL_RGB || format == GL_LUMINANCE)
 235          mmesa->hw.alpha_sel = AC_alphasel_diffused;
 236       else
 237          mmesa->hw.alpha_sel = AC_alphasel_modulated;
 238       break;
 239
 240    case GL_DECAL:
 241       if (format == GL_RGB || format == GL_RGBA)
 242          t->setup.texctl2 |= TMC_decalblend_enable;
 243       else
 244          t->setup.texctl2 |= TMC_idecal_enable;
 245
 246       mmesa->hw.alpha_sel = AC_alphasel_diffused;
 247       break;
 248
 249    case GL_BLEND:
 250       if (format == GL_ALPHA) {
 251          t->setup.texctl2 |= TMC_idecal_enable;
 252          mmesa->hw.alpha_sel = AC_alphasel_modulated;
 253       } else {
 254          t->texenv_fallback = GL_TRUE;
 255       }
 256       break;
 257
 258    default:
 259       break;
 260    }
 261 }
 262
 263
 264 #define MGA_REPLACE             0
 265 #define MGA_MODULATE            1
 266 #define MGA_DECAL               2
 267 #define MGA_ADD                 3
 268 #define MGA_MAX_COMBFUNC        4
 269
 270 static const GLuint g400_color_combine[][MGA_MAX_COMBFUNC] =
 271 {
 272    /* Unit 0:
 273     */
 274    {
 275       /* GL_REPLACE
 276        * Cv = Cs
 277        * Av = Af
 278        */
 279       (TD0_color_sel_arg1 |
 280        TD0_alpha_arg2_diffuse |
 281        TD0_alpha_sel_arg2),
 282
 283       /* GL_MODULATE
 284        * Cv = Cf Cs
 285        * Av = Af
 286        */
 287       (TD0_color_arg2_diffuse |
 288        TD0_color_sel_mul |
 289        TD0_alpha_arg2_diffuse |
 290        TD0_alpha_sel_arg2),
 291
 292       /* GL_DECAL
 293        * Cv = Cs
 294        * Av = Af
 295        */
 296       (TD0_color_sel_arg1 |
 297        TD0_alpha_arg2_diffuse |
 298        TD0_alpha_sel_arg2),
 299
 300       /* GL_ADD
 301        * Cv = Cf + Cs
 302        * Av = Af
 303        */
 304       (TD0_color_arg2_diffuse |
 305        TD0_color_add_add |
 306        TD0_color_sel_add |
 307        TD0_alpha_arg2_diffuse |
 308        TD0_alpha_sel_arg2),
 309    },
 310
 311    /* Unit 1:
 312     */
 313    {
 314       /* GL_REPLACE
 315        * Cv = Cs
 316        * Av = Ap
 317        */
 318       (TD0_color_sel_arg1 |
 319        TD0_alpha_arg2_prevstage |
 320        TD0_alpha_sel_arg2),
 321
 322       /* GL_MODULATE
 323        * Cv = Cp Cs
 324        * Av = Ap
 325        */
 326       (TD0_color_arg2_prevstage |
 327        TD0_color_sel_mul |
 328        TD0_alpha_arg2_prevstage |
 329        TD0_alpha_sel_arg2),
 330
 331       /* GL_DECAL
 332        * Cv = Cs
 333        * Av = Ap
 334        */
 335       (TD0_color_sel_arg1 |
 336        TD0_alpha_arg2_prevstage |
 337        TD0_alpha_sel_arg2),
 338
 339       /* GL_ADD
 340        * Cv = Cp + Cs
 341        * Av = Ap
 342        */
 343       (TD0_color_arg2_prevstage |
 344        TD0_color_add_add |
 345        TD0_color_sel_add |
 346        TD0_alpha_arg2_prevstage |
 347        TD0_alpha_sel_arg2),
 348    },
 349 };
 350
 351 static const GLuint g400_color_alpha_combine[][MGA_MAX_COMBFUNC] =
 352 {
 353    /* Unit 0:
 354     */
 355    {
 356       /* GL_REPLACE
 357        * Cv = Cs
 358        * Av = As
 359        */
 360       (TD0_color_sel_arg1 |
 361        TD0_alpha_sel_arg1),
 362
 363       /* GL_MODULATE
 364        * Cv = Cf Cs
 365        * Av = Af As
 366        */
 367       (TD0_color_arg2_diffuse |
 368        TD0_color_sel_mul |
 369        TD0_alpha_arg2_diffuse |
 370        TD0_alpha_sel_mul),
 371
 372       /* GL_DECAL
 373        * tmp = Cf ( 1 - As )
 374        * Cv = tmp + Cs As
 375        * Av = Af
 376        */
 377       (TD0_color_arg2_diffuse |
 378        TD0_color_alpha_currtex |
 379        TD0_color_alpha1inv_enable |
 380        TD0_color_arg1mul_alpha1 |
 381        TD0_color_blend_enable |
 382        TD0_color_arg1add_mulout |
 383        TD0_color_arg2add_mulout |
 384        TD0_color_add_add |
 385        TD0_color_sel_add |
 386        TD0_alpha_arg2_diffuse |
 387        TD0_alpha_sel_arg2),
 388
 389       /* GL_ADD
 390        * Cv = Cf + Cs
 391        * Av = Af As
 392        */
 393       (TD0_color_arg2_diffuse |
 394        TD0_color_add_add |
 395        TD0_color_sel_add |
 396        TD0_alpha_arg2_diffuse |
 397        TD0_alpha_sel_mul),
 398    },
 399
 400    /* Unit 1:
 401     */
 402    {
 403       /* GL_REPLACE
 404        * Cv = Cs
 405        * Av = As
 406        */
 407       (TD0_color_sel_arg1 |
 408        TD0_alpha_sel_arg1),
 409
 410       /* GL_MODULATE
 411        * Cv = Cp Cs
 412        * Av = Ap As
 413        */
 414       (TD0_color_arg2_prevstage |
 415        TD0_color_sel_mul |
 416        TD0_alpha_arg2_prevstage |
 417        TD0_alpha_sel_mul),
 418
 419       /* GL_DECAL
 420        * tmp = Cp ( 1 - As )
 421        * Cv = tmp + Cs As
 422        * Av = Ap
 423        */
 424       (TD0_color_arg2_prevstage |
 425        TD0_color_alpha_currtex |
 426        TD0_color_alpha1inv_enable |
 427        TD0_color_arg1mul_alpha1 |
 428        TD0_color_blend_enable |
 429        TD0_color_arg1add_mulout |
 430        TD0_color_arg2add_mulout |
 431        TD0_color_add_add |
 432        TD0_color_sel_add |
 433        TD0_alpha_arg2_prevstage |
 434        TD0_alpha_sel_arg2),
 435
 436       /* GL_ADD
 437        * Cv = Cp + Cs
 438        * Av = Ap As
 439        */
 440       (TD0_color_arg2_prevstage |
 441        TD0_color_add_add |
 442        TD0_color_sel_add |
 443        TD0_alpha_arg2_prevstage |
 444        TD0_alpha_sel_mul),
 445    },
 446 };
 447
 448 static const GLuint g400_alpha_combine[][MGA_MAX_COMBFUNC] =
 449 {
 450    /* Unit 0:
 451     */
 452    {
 453       /* GL_REPLACE
 454        * Cv = Cf
 455        * Av = As
 456        */
 457       (TD0_color_arg2_diffuse |
 458        TD0_color_sel_arg2 |
 459        TD0_alpha_sel_arg1),
 460
 461       /* GL_MODULATE
 462        * Cv = Cf
 463        * Av = Af As
 464        */
 465       (TD0_color_arg2_diffuse |
 466        TD0_color_sel_arg2 |
 467        TD0_alpha_arg2_diffuse |
 468        TD0_alpha_sel_mul),
 469
 470       /* GL_DECAL (undefined)
 471        * Cv = Cf
 472        * Av = Af
 473        */
 474       (TD0_color_arg2_diffuse |
 475        TD0_color_sel_arg2 |
 476        TD0_alpha_arg2_diffuse |
 477        TD0_alpha_sel_arg2),
 478
 479       /* GL_ADD
 480        * Cv = Cf
 481        * Av = Af As
 482        */
 483       (TD0_color_arg2_diffuse |
 484        TD0_color_sel_arg2 |
 485        TD0_alpha_arg2_diffuse |
 486        TD0_alpha_sel_mul),
 487    },
 488
 489    /* Unit 1:
 490     */
 491    {
 492       /* GL_REPLACE
 493        * Cv = Cp
 494        * Av = As
 495        */
 496       (TD0_color_arg2_prevstage |
 497        TD0_color_sel_arg2 |
 498        TD0_alpha_sel_arg1),
 499
 500       /* GL_MODULATE
 501        * Cv = Cp
 502        * Av = Ap As
 503        */
 504       (TD0_color_arg2_prevstage |
 505        TD0_color_sel_arg2 |
 506        TD0_alpha_arg2_prevstage |
 507        TD0_alpha_sel_mul),
 508
 509       /* GL_DECAL (undefined)
 510        * Cv = Cp
 511        * Av = Ap
 512        */
 513       (TD0_color_arg2_prevstage |
 514        TD0_color_sel_arg2 |
 515        TD0_alpha_arg2_prevstage |
 516        TD0_alpha_sel_arg2),
 517
 518       /* GL_ADD
 519        * Cv = Cp
 520        * Av = Ap As
 521        */
 522       (TD0_color_arg2_prevstage |
 523        TD0_color_sel_arg2 |
 524        TD0_alpha_arg2_prevstage |
 525        TD0_alpha_sel_mul),
 526    },
 527 };
 528
 529 static GLboolean mgaUpdateTextureEnvBlend( GLcontext *ctx, int unit )
 530 {
 531    mgaContextPtr mmesa = MGA_CONTEXT(ctx);
 532    const int source = mmesa->tmu_source[unit];
 533    const struct gl_texture_unit *texUnit = &ctx->Texture.Unit[source];
 534    const struct gl_texture_object *tObj = texUnit->_Current;
 535    GLuint *reg = ((GLuint *)&mmesa->setup.tdualstage0 + unit);
 536    GLenum format = tObj->Image[0][tObj->BaseLevel]->_BaseFormat;
 537
 538    *reg = 0;
 539
 540    if (format == GL_ALPHA) {
 541       /* Cv = Cf */
 542       *reg |= (TD0_color_arg2_diffuse |
 543                TD0_color_sel_arg2);
 544       /* Av = Af As */
 545       *reg |= (TD0_alpha_arg2_diffuse |
 546                TD0_alpha_sel_mul);
 547       return GL_TRUE;
 548    }
 549
 550    /* C1 = Cf ( 1 - Cs ) */
 551    *reg |= (TD0_color_arg1_inv_enable |
 552             TD0_color_arg2_diffuse |
 553             TD0_color_sel_mul);
 554
 555    if (format == GL_RGB || format == GL_LUMINANCE) {
 556       /* A1 = Af */
 557       *reg |= (TD0_alpha_arg2_diffuse |
 558                TD0_alpha_sel_arg2);
 559    } else
 560    if (format == GL_RGBA || format == GL_LUMINANCE_ALPHA) {
 561       /* A1 = Af As */
 562       *reg |= (TD0_alpha_arg2_diffuse |
 563                TD0_alpha_sel_mul);
 564    } else
 565    if (format == GL_INTENSITY) {
 566       /* A1 = Af ( 1 - As ) */
 567       *reg |= (TD0_alpha_arg1_inv_enable |
 568                TD0_alpha_arg2_diffuse |
 569                TD0_alpha_sel_mul);
 570    }
 571
 572    if (RGB_ZERO(mmesa->envcolor[source]) &&
 573        (format != GL_INTENSITY || ALPHA_ZERO(mmesa->envcolor[source])))
 574       return GL_TRUE; /* all done */
 575
 576    if (ctx->Texture._EnabledUnits == 0x03)
 577       return GL_FALSE; /* need both units */
 578
 579    mmesa->force_dualtex = GL_TRUE;
 580    reg = &mmesa->setup.tdualstage1;
 581    *reg = 0;
 582
 583    if (RGB_ZERO(mmesa->envcolor[source])) {
 584       /* Cv = C1 */
 585       *reg |= (TD0_color_arg2_prevstage |
 586                TD0_color_sel_arg2);
 587    } else
 588    if (RGB_ONE(mmesa->envcolor[source])) {
 589       /* Cv = C1 + Cs */
 590       *reg |= (TD0_color_arg2_prevstage |
 591                TD0_color_add_add |
 592                TD0_color_sel_add);
 593    } else
 594    if (RGBA_EQUAL(mmesa->envcolor[source])) {
 595       /* Cv = C1 + Cc Cs */
 596       *reg |= (TD0_color_arg2_prevstage |
 597                TD0_color_alpha_fcol |
 598                TD0_color_arg2mul_alpha2 |
 599                TD0_color_arg1add_mulout |
 600                TD0_color_add_add |
 601                TD0_color_sel_add);
 602
 603       mmesa->setup.fcol = mmesa->envcolor[source];
 604    } else {
 605       return GL_FALSE;
 606    }
 607
 608    if (format != GL_INTENSITY || ALPHA_ZERO(mmesa->envcolor[source])) {
 609       /* Av = A1 */
 610       *reg |= (TD0_alpha_arg2_prevstage |
 611                TD0_alpha_sel_arg2);
 612    } else
 613    if (ALPHA_ONE(mmesa->envcolor[source])) {
 614       /* Av = A1 + As */
 615       *reg |= (TD0_alpha_arg2_prevstage |
 616                TD0_alpha_add_enable |
 617                TD0_alpha_sel_add);
 618    } else {
 619       return GL_FALSE;
 620    }
 621
 622    return GL_TRUE;
 623 }
 624
 625 static void mgaUpdateTextureEnvG400( GLcontext *ctx, GLuint unit )
 626 {
 627    mgaContextPtr mmesa = MGA_CONTEXT( ctx );
 628    const int source = mmesa->tmu_source[unit];
 629    const struct gl_texture_unit *texUnit = &ctx->Texture.Unit[source];
 630    const struct gl_texture_object *tObj = texUnit->_Current;
 631    GLuint *reg = ((GLuint *)&mmesa->setup.tdualstage0 + unit);
 632    mgaTextureObjectPtr t = (mgaTextureObjectPtr) tObj->DriverData;
 633    GLenum format = tObj->Image[0][tObj->BaseLevel]->_BaseFormat;
 634
 635    if (tObj != ctx->Texture.Unit[source].CurrentTex[TEXTURE_2D_INDEX] &&
 636        tObj != ctx->Texture.Unit[source].CurrentTex[TEXTURE_RECT_INDEX])
 637       return;
 638
 639    switch (ctx->Texture.Unit[source].EnvMode) {
 640    case GL_REPLACE:
 641       if (format == GL_ALPHA) {
 642          *reg = g400_alpha_combine[unit][MGA_REPLACE];
 643       } else if (format == GL_RGB || format == GL_LUMINANCE) {
 644          *reg = g400_color_combine[unit][MGA_REPLACE];
 645       } else {
 646          *reg = g400_color_alpha_combine[unit][MGA_REPLACE];
 647       }
 648       break;
 649
 650    case GL_MODULATE:
 651       if (format == GL_ALPHA) {
 652          *reg = g400_alpha_combine[unit][MGA_MODULATE];
 653       } else if (format == GL_RGB || format == GL_LUMINANCE) {
 654          *reg = g400_color_combine[unit][MGA_MODULATE];
 655       } else {
 656          *reg = g400_color_alpha_combine[unit][MGA_MODULATE];
 657       }
 658       break;
 659
 660    case GL_DECAL:
 661       if (format == GL_RGB) {
 662          *reg = g400_color_combine[unit][MGA_DECAL];
 663       } else if (format == GL_RGBA) {
 664          *reg = g400_color_alpha_combine[unit][MGA_DECAL];
 665          if (ctx->Texture._EnabledUnits != 0x03) {
 666             /* Linear blending mode needs dual texturing enabled */
 667             *(reg+1) = (TD0_color_arg2_prevstage |
 668                         TD0_color_sel_arg2 |
 669                         TD0_alpha_arg2_prevstage |
 670                         TD0_alpha_sel_arg2);
 671             mmesa->force_dualtex = GL_TRUE;
 672          }
 673       } else {
 674          /* Undefined */
 675          *reg = g400_alpha_combine[unit][MGA_DECAL];
 676       }
 677       break;
 678
 679    case GL_ADD:
 680       if (format == GL_ALPHA) {
 681          *reg = g400_alpha_combine[unit][MGA_ADD];
 682       } else if (format == GL_RGB || format == GL_LUMINANCE) {
 683          *reg = g400_color_combine[unit][MGA_ADD];
 684       } else if (format == GL_RGBA || format == GL_LUMINANCE_ALPHA) {
 685          *reg = g400_color_alpha_combine[unit][MGA_ADD];
 686       } else if (format == GL_INTENSITY) {
 687          /* Cv = Cf + Cs
 688           * Av = Af + As
 689           */
 690          if (unit == 0) {
 691             *reg = (TD0_color_arg2_diffuse |
 692                     TD0_color_add_add |
 693                     TD0_color_sel_add |
 694                     TD0_alpha_arg2_diffuse |
 695                     TD0_alpha_add_enable |
 696                     TD0_alpha_sel_add);
 697          } else {
 698             *reg = (TD0_color_arg2_prevstage |
 699                     TD0_color_add_add |
 700                     TD0_color_sel_add |
 701                     TD0_alpha_arg2_prevstage |
 702                     TD0_alpha_add_enable |
 703                     TD0_alpha_sel_add);
 704          }
 705       }
 706       break;
 707
 708    case GL_BLEND:
 709       if (!mgaUpdateTextureEnvBlend(ctx, unit))
 710          t->texenv_fallback = GL_TRUE;
 711       break;
 712
 713    case GL_COMBINE:
 714       if (!mgaUpdateTextureEnvCombine(ctx, unit))
 715          t->texenv_fallback = GL_TRUE;
 716       break;
 717    default:
 718       break;
 719    }
 720 }
 721
 722 static void disable_tex( GLcontext *ctx, int unit )
 723 {
 724    mgaContextPtr mmesa = MGA_CONTEXT( ctx );
 725
 726    /* Texture unit disabled */
 727
 728    if ( mmesa->CurrentTexObj[unit] != NULL ) {
 729       /* The old texture is no longer bound to this texture unit.
 730        * Mark it as such.
 731        */
 732
 733       mmesa->CurrentTexObj[unit]->base.bound &= ~(1UL << unit);
 734       mmesa->CurrentTexObj[unit] = NULL;
 735    }
 736
 737    if ( unit != 0 && !mmesa->force_dualtex ) {
 738       mmesa->setup.tdualstage1 = mmesa->setup.tdualstage0;
 739    }
 740
 741    if ( ctx->Texture._EnabledUnits == 0 ) {
 742       mmesa->setup.dwgctl &= DC_opcod_MASK;
 743       mmesa->setup.dwgctl |= DC_opcod_trap;
 744       mmesa->hw.alpha_sel = AC_alphasel_diffused;
 745    }
 746
 747    mmesa->dirty |= MGA_UPLOAD_CONTEXT | (MGA_UPLOAD_TEX0 << unit);
 748 }
 749
 750 static GLboolean enable_tex( GLcontext *ctx, int unit )
 751 {
 752    mgaContextPtr mmesa = MGA_CONTEXT(ctx);
 753    const int source = mmesa->tmu_source[unit];
 754    const struct gl_texture_unit *texUnit = &ctx->Texture.Unit[source];
 755    const struct gl_texture_object *tObj = texUnit->_Current;
 756    mgaTextureObjectPtr t = (mgaTextureObjectPtr) tObj->DriverData;
 757
 758    /* Upload teximages (not pipelined)
 759     */
 760    if (t->base.dirty_images[0]) {
 761       FLUSH_BATCH( mmesa );
 762       mgaSetTexImages( mmesa, tObj );
 763       if ( t->base.memBlock == NULL ) {
 764          return GL_FALSE;
 765       }
 766    }
 767
 768    return GL_TRUE;
 769 }
 770
 771 static GLboolean update_tex_common( GLcontext *ctx, int unit )
 772 {
 773    mgaContextPtr mmesa = MGA_CONTEXT(ctx);
 774    const int source = mmesa->tmu_source[unit];
 775    const struct gl_texture_unit *texUnit = &ctx->Texture.Unit[source];
 776    struct gl_texture_object     *tObj = texUnit->_Current;
 777    mgaTextureObjectPtr t = (mgaTextureObjectPtr) tObj->DriverData;
 778
 779    /* Fallback if there's a texture border */
 780    if ( tObj->Image[0][tObj->BaseLevel]->Border > 0 ) {
 781       return GL_FALSE;
 782    }
 783
 784
 785    /* Update state if this is a different texture object to last
 786     * time.
 787     */
 788    if ( mmesa->CurrentTexObj[unit] != t ) {
 789       if ( mmesa->CurrentTexObj[unit] != NULL ) {
 790          /* The old texture is no longer bound to this texture unit.
 791           * Mark it as such.
 792           */
 793
 794          mmesa->CurrentTexObj[unit]->base.bound &= ~(1UL << unit);
 795       }
 796
 797       mmesa->CurrentTexObj[unit] = t;
 798       t->base.bound |= (1UL << unit);
 799
 800       driUpdateTextureLRU( (driTextureObject *) t ); /* done too often */
 801    }
 802
 803    /* register setup */
 804    if ( unit == 1 ) {
 805       mmesa->setup.tdualstage1 = mmesa->setup.tdualstage0;
 806    }
 807
 808    t->texenv_fallback = GL_FALSE;
 809
 810    /* Set this before mgaUpdateTextureEnvG400() since
 811     * GL_ARB_texture_env_crossbar may have to disable texturing.
 812     */
 813    mmesa->setup.dwgctl &= DC_opcod_MASK;
 814    mmesa->setup.dwgctl |= DC_opcod_texture_trap;
 815
 816    /* FIXME: The Radeon has some cached state so that it can avoid calling
 817     * FIXME: UpdateTextureEnv in some cases.  Is that possible here?
 818     */
 819    if (MGA_IS_G400(mmesa)) {
 820       /* G400: Regardless of texture env mode, we use the alpha from the
 821        * texture unit (AC_alphasel_fromtex) since it will have already
 822        * been modulated by the incoming fragment color, if needed.
 823        * We don't want (AC_alphasel_modulate) since that'll effectively
 824        * do the modulation twice.
 825        */
 826       mmesa->hw.alpha_sel = AC_alphasel_fromtex;
 827
 828       mgaUpdateTextureEnvG400( ctx, unit );
 829    } else {
 830       mgaUpdateTextureEnvG200( ctx, unit );
 831    }
 832
 833    t->setup.texctl2 &= TMC_dualtex_MASK;
 834    if (ctx->Texture._EnabledUnits == 0x03 || mmesa->force_dualtex) {
 835       t->setup.texctl2 |= TMC_dualtex_enable;
 836    }
 837
 838    mmesa->dirty |= MGA_UPLOAD_CONTEXT | (MGA_UPLOAD_TEX0 << unit);
 839
 840    FALLBACK( ctx, MGA_FALLBACK_BORDER_MODE, t->border_fallback );
 841    return !t->border_fallback && !t->texenv_fallback;
 842 }
 843
 844
 845 static GLboolean updateTextureUnit( GLcontext *ctx, int unit )
 846 {
 847    mgaContextPtr mmesa = MGA_CONTEXT( ctx );
 848    const int source = mmesa->tmu_source[unit];
 849    const struct gl_texture_unit *texUnit = &ctx->Texture.Unit[source];
 850
 851
 852    if ( texUnit->_ReallyEnabled == TEXTURE_2D_BIT ||
 853         texUnit->_ReallyEnabled == TEXTURE_RECT_BIT ) {
 854       return(enable_tex( ctx, unit ) &&
 855              update_tex_common( ctx, unit ));
 856    }
 857    else if ( texUnit->_ReallyEnabled ) {
 858       return GL_FALSE;
 859    }
 860    else {
 861       disable_tex( ctx, unit );
 862       return GL_TRUE;
 863    }
 864 }
 865
 866 /* The G400 is now programmed quite differently wrt texture environment.
 867  */
 868 void mgaUpdateTextureState( GLcontext *ctx )
 869 {
 870    mgaContextPtr mmesa = MGA_CONTEXT( ctx );
 871    GLboolean ok;
 872    unsigned  i;
 873
 874    mmesa->force_dualtex = GL_FALSE;
 875    mmesa->fcol_used = GL_FALSE;
 876
 877    /* This works around a quirk with the MGA hardware.  If only OpenGL
 878     * TEXTURE1 is enabled, then the hardware TEXTURE0 must be used.  The
 879     * hardware TEXTURE1 can ONLY be used when hardware TEXTURE0 is also used.
 880     */
 881
 882    mmesa->tmu_source[0] = 0;
 883    mmesa->tmu_source[1] = 1;
 884
 885    if ((ctx->Texture._EnabledUnits & 0x03) == 0x02) {
 886       /* only texture 1 enabled */
 887       mmesa->tmu_source[0] = 1;
 888       mmesa->tmu_source[1] = 0;
 889    }
 890
 891    for ( i = 0, ok = GL_TRUE
 892          ; (i < ctx->Const.MaxTextureUnits) && ok
 893          ; i++ ) {
 894       ok = updateTextureUnit( ctx, i );
 895    }
 896
 897    FALLBACK( ctx, MGA_FALLBACK_TEXTURE, !ok );
 898 }