src/mesa/drivers/dri/i915/i830_texblend.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
   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
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
  22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27
  28 #include "glheader.h"
  29 #include "macros.h"
  30 #include "mtypes.h"
  31 #include "simple_list.h"
  32 #include "enums.h"
  33 #include "texformat.h"
  34 #include "texstore.h"
  35
  36 #include "mm.h"
  37
  38 #include "intel_screen.h"
  39 #include "intel_ioctl.h"
  40 #include "intel_tex.h"
  41
  42 #include "i830_context.h"
  43 #include "i830_reg.h"
  44
  45
  46 /* ================================================================
  47  * Texture combine functions
  48  */
  49 static GLuint pass_through( GLuint *state, GLuint blendUnit )
  50 {
  51    state[0] = (_3DSTATE_MAP_BLEND_OP_CMD(blendUnit) |
  52                TEXPIPE_COLOR |
  53                ENABLE_TEXOUTPUT_WRT_SEL |
  54                TEXOP_OUTPUT_CURRENT |
  55                DISABLE_TEX_CNTRL_STAGE |
  56                TEXOP_SCALE_1X |
  57                TEXOP_MODIFY_PARMS |
  58                TEXBLENDOP_ARG1);
  59    state[1] = (_3DSTATE_MAP_BLEND_OP_CMD(blendUnit) |
  60                TEXPIPE_ALPHA |
  61                ENABLE_TEXOUTPUT_WRT_SEL |
  62                TEXOP_OUTPUT_CURRENT |
  63                TEXOP_SCALE_1X |
  64                TEXOP_MODIFY_PARMS |
  65                TEXBLENDOP_ARG1);
  66    state[2] = (_3DSTATE_MAP_BLEND_ARG_CMD(blendUnit) |
  67                TEXPIPE_COLOR |
  68                TEXBLEND_ARG1 |
  69                TEXBLENDARG_MODIFY_PARMS |
  70                TEXBLENDARG_CURRENT);
  71    state[3] = (_3DSTATE_MAP_BLEND_ARG_CMD(blendUnit) |
  72                TEXPIPE_ALPHA |
  73                TEXBLEND_ARG1 |
  74                TEXBLENDARG_MODIFY_PARMS |
  75                TEXBLENDARG_CURRENT);
  76
  77    return 4;
  78 }
  79
  80 static GLuint emit_factor( GLuint blendUnit, GLuint *state, GLuint count,
  81                            const GLfloat *factor )
  82 {
  83    GLubyte r, g, b, a;
  84    GLuint col;
  85
  86    if (0)
  87       fprintf(stderr, "emit constant %d: %.2f %.2f %.2f %.2f\n",
  88           blendUnit, factor[0], factor[1], factor[2], factor[3]);
  89
  90    UNCLAMPED_FLOAT_TO_UBYTE(r, factor[0]);
  91    UNCLAMPED_FLOAT_TO_UBYTE(g, factor[1]);
  92    UNCLAMPED_FLOAT_TO_UBYTE(b, factor[2]);
  93    UNCLAMPED_FLOAT_TO_UBYTE(a, factor[3]);
  94
  95    col = ((a << 24) | (r << 16) | (g << 8) | b);
  96
  97    state[count++] = _3DSTATE_COLOR_FACTOR_N_CMD(blendUnit);
  98    state[count++] = col;
  99
 100    return count;
 101 }
 102
 103
 104 static __inline__ GLuint GetTexelOp(GLint unit)
 105 {
 106    switch(unit) {
 107    case 0: return TEXBLENDARG_TEXEL0;
 108    case 1: return TEXBLENDARG_TEXEL1;
 109    case 2: return TEXBLENDARG_TEXEL2;
 110    case 3: return TEXBLENDARG_TEXEL3;
 111    default: return TEXBLENDARG_TEXEL0;
 112    }
 113 }
 114
 115
 116 /**
 117  * Calculate the hardware instuctions to setup the current texture enviromnemt
 118  * settings.  Since \c gl_texture_unit::_CurrentCombine is used, both
 119  * "classic" texture enviroments and GL_ARB_texture_env_combine type texture
 120  * environments are treated identically.
 121  *
 122  * \todo
 123  * This function should return \c GLboolean.  When \c GL_FALSE is returned,
 124  * it means that an environment is selected that the hardware cannot do.  This
 125  * is the way the Radeon and R200 drivers work.
 126  *
 127  * \todo
 128  * Looking at i830_3d_regs.h, it seems the i830 can do part of
 129  * GL_ATI_texture_env_combine3.  It can handle using \c GL_ONE and
 130  * \c GL_ZERO as combine inputs (which the code already supports).  It can
 131  * also handle the \c GL_MODULATE_ADD_ATI mode.  Is it worth investigating
 132  * partial support for the extension?
 133  */
 134 GLuint
 135 i830SetTexEnvCombine(i830ContextPtr i830,
 136                      const struct gl_tex_env_combine_state * combine,
 137                      GLint blendUnit,
 138                      GLuint texel_op,
 139                      GLuint *state,
 140                      const GLfloat *factor )
 141 {
 142    const GLuint numColorArgs = combine->_NumArgsRGB;
 143    const GLuint numAlphaArgs = combine->_NumArgsA;
 144
 145    GLuint blendop;
 146    GLuint ablendop;
 147    GLuint args_RGB[3];
 148    GLuint args_A[3];
 149    GLuint rgb_shift;
 150    GLuint alpha_shift;
 151    GLboolean need_factor = 0;
 152    int i;
 153    unsigned used;
 154    static const GLuint tex_blend_rgb[3] = {
 155       TEXPIPE_COLOR | TEXBLEND_ARG1 | TEXBLENDARG_MODIFY_PARMS,
 156       TEXPIPE_COLOR | TEXBLEND_ARG2 | TEXBLENDARG_MODIFY_PARMS,
 157       TEXPIPE_COLOR | TEXBLEND_ARG0 | TEXBLENDARG_MODIFY_PARMS,
 158    };
 159    static const GLuint tex_blend_a[3] = {
 160       TEXPIPE_ALPHA | TEXBLEND_ARG1 | TEXBLENDARG_MODIFY_PARMS,
 161       TEXPIPE_ALPHA | TEXBLEND_ARG2 | TEXBLENDARG_MODIFY_PARMS,
 162       TEXPIPE_ALPHA | TEXBLEND_ARG0 | TEXBLENDARG_MODIFY_PARMS,
 163    };
 164
 165    if(INTEL_DEBUG&DEBUG_TEXTURE)
 166       fprintf(stderr, "%s\n", __FUNCTION__);
 167
 168
 169    /* The EXT version of the DOT3 extension does not support the
 170     * scale factor, but the ARB version (and the version in OpenGL
 171     * 1.3) does.
 172     */
 173    switch (combine->ModeRGB) {
 174    case GL_DOT3_RGB_EXT:
 175       alpha_shift = combine->ScaleShiftA;
 176       rgb_shift = 0;
 177       break;
 178
 179    case GL_DOT3_RGBA_EXT:
 180       alpha_shift = 0;
 181       rgb_shift = 0;
 182       break;
 183
 184    default:
 185       rgb_shift = combine->ScaleShiftRGB;
 186       alpha_shift = combine->ScaleShiftA;
 187       break;
 188    }
 189
 190
 191    switch(combine->ModeRGB) {
 192    case GL_REPLACE:
 193       blendop = TEXBLENDOP_ARG1;
 194       break;
 195    case GL_MODULATE:
 196       blendop = TEXBLENDOP_MODULATE;
 197       break;
 198    case GL_ADD:
 199       blendop = TEXBLENDOP_ADD;
 200       break;
 201    case GL_ADD_SIGNED:
 202       blendop = TEXBLENDOP_ADDSIGNED;
 203       break;
 204    case GL_INTERPOLATE:
 205       blendop = TEXBLENDOP_BLEND;
 206       break;
 207    case GL_SUBTRACT:
 208       blendop = TEXBLENDOP_SUBTRACT;
 209       break;
 210    case GL_DOT3_RGB_EXT:
 211    case GL_DOT3_RGB:
 212       blendop = TEXBLENDOP_DOT3;
 213       break;
 214    case GL_DOT3_RGBA_EXT:
 215    case GL_DOT3_RGBA:
 216       blendop = TEXBLENDOP_DOT3;
 217       break;
 218    default:
 219       return pass_through( state, blendUnit );
 220    }
 221
 222    blendop |= (rgb_shift << TEXOP_SCALE_SHIFT);
 223
 224
 225    /* Handle RGB args */
 226    for(i = 0; i < 3; i++) {
 227       switch(combine->SourceRGB[i]) {
 228       case GL_TEXTURE:
 229          args_RGB[i] = texel_op;
 230          break;
 231       case GL_TEXTURE0:
 232       case GL_TEXTURE1:
 233       case GL_TEXTURE2:
 234       case GL_TEXTURE3:
 235          args_RGB[i] = GetTexelOp( combine->SourceRGB[i] - GL_TEXTURE0 );
 236          break;
 237       case GL_CONSTANT:
 238          args_RGB[i] = TEXBLENDARG_FACTOR_N;
 239          need_factor = 1;
 240          break;
 241       case GL_PRIMARY_COLOR:
 242          args_RGB[i] = TEXBLENDARG_DIFFUSE;
 243          break;
 244       case GL_PREVIOUS:
 245          args_RGB[i] = TEXBLENDARG_CURRENT;
 246          break;
 247       default:
 248          return pass_through( state, blendUnit );
 249       }
 250
 251       switch(combine->OperandRGB[i]) {
 252       case GL_SRC_COLOR:
 253          args_RGB[i] |= 0;
 254          break;
 255       case GL_ONE_MINUS_SRC_COLOR:
 256          args_RGB[i] |= TEXBLENDARG_INV_ARG;
 257          break;
 258       case GL_SRC_ALPHA:
 259          args_RGB[i] |= TEXBLENDARG_REPLICATE_ALPHA;
 260          break;
 261       case GL_ONE_MINUS_SRC_ALPHA:
 262          args_RGB[i] |= (TEXBLENDARG_REPLICATE_ALPHA |
 263                          TEXBLENDARG_INV_ARG);
 264          break;
 265       default:
 266          return pass_through( state, blendUnit );
 267       }
 268    }
 269
 270
 271    /* Need to knobble the alpha calculations of TEXBLENDOP_DOT4 to
 272     * match the spec.  Can't use DOT3 as it won't propogate values
 273     * into alpha as required:
 274     *
 275     * Note - the global factor is set up with alpha == .5, so
 276     * the alpha part of the DOT4 calculation should be zero.
 277     */
 278    if ( combine->ModeRGB == GL_DOT3_RGBA_EXT ||
 279         combine->ModeRGB == GL_DOT3_RGBA ) {
 280       ablendop = TEXBLENDOP_DOT4;
 281       args_A[0] = TEXBLENDARG_FACTOR; /* the global factor */
 282       args_A[1] = TEXBLENDARG_FACTOR;
 283       args_A[2] = TEXBLENDARG_FACTOR;
 284    }
 285    else {
 286       switch(combine->ModeA) {
 287       case GL_REPLACE:
 288          ablendop = TEXBLENDOP_ARG1;
 289          break;
 290       case GL_MODULATE:
 291          ablendop = TEXBLENDOP_MODULATE;
 292          break;
 293       case GL_ADD:
 294          ablendop = TEXBLENDOP_ADD;
 295          break;
 296       case GL_ADD_SIGNED:
 297          ablendop = TEXBLENDOP_ADDSIGNED;
 298          break;
 299       case GL_INTERPOLATE:
 300          ablendop = TEXBLENDOP_BLEND;
 301          break;
 302       case GL_SUBTRACT:
 303          ablendop = TEXBLENDOP_SUBTRACT;
 304          break;
 305       default:
 306          return pass_through( state, blendUnit );
 307       }
 308
 309
 310       ablendop |= (alpha_shift << TEXOP_SCALE_SHIFT);
 311
 312       /* Handle A args */
 313       for(i = 0; i < 3; i++) {
 314          switch(combine->SourceA[i]) {
 315          case GL_TEXTURE:
 316             args_A[i] = texel_op;
 317             break;
 318          case GL_TEXTURE0:
 319          case GL_TEXTURE1:
 320          case GL_TEXTURE2:
 321          case GL_TEXTURE3:
 322             args_A[i] = GetTexelOp( combine->SourceA[i] - GL_TEXTURE0 );
 323             break;
 324          case GL_CONSTANT:
 325             args_A[i] = TEXBLENDARG_FACTOR_N;
 326             need_factor = 1;
 327             break;
 328          case GL_PRIMARY_COLOR:
 329             args_A[i] = TEXBLENDARG_DIFFUSE;
 330             break;
 331          case GL_PREVIOUS:
 332             args_A[i] = TEXBLENDARG_CURRENT;
 333             break;
 334          default:
 335             return pass_through( state, blendUnit );
 336          }
 337
 338          switch(combine->OperandA[i]) {
 339          case GL_SRC_ALPHA:
 340             args_A[i] |= 0;
 341             break;
 342          case GL_ONE_MINUS_SRC_ALPHA:
 343             args_A[i] |= TEXBLENDARG_INV_ARG;
 344             break;
 345          default:
 346             return pass_through( state, blendUnit );
 347          }
 348       }
 349    }
 350
 351
 352
 353    /* Native Arg1 == Arg0 in GL_EXT_texture_env_combine spec */
 354    /* Native Arg2 == Arg1 in GL_EXT_texture_env_combine spec */
 355    /* Native Arg0 == Arg2 in GL_EXT_texture_env_combine spec */
 356
 357    /* When we render we need to figure out which is the last really enabled
 358     * tex unit, and put last stage on it
 359     */
 360
 361
 362    /* Build color & alpha pipelines */
 363
 364    used = 0;
 365    state[used++] = (_3DSTATE_MAP_BLEND_OP_CMD(blendUnit) |
 366                     TEXPIPE_COLOR |
 367                     ENABLE_TEXOUTPUT_WRT_SEL |
 368                     TEXOP_OUTPUT_CURRENT |
 369                     DISABLE_TEX_CNTRL_STAGE |
 370                     TEXOP_MODIFY_PARMS |
 371                     blendop);
 372    state[used++] = (_3DSTATE_MAP_BLEND_OP_CMD(blendUnit) |
 373                     TEXPIPE_ALPHA |
 374                     ENABLE_TEXOUTPUT_WRT_SEL |
 375                     TEXOP_OUTPUT_CURRENT |
 376                     TEXOP_MODIFY_PARMS |
 377                     ablendop);
 378
 379    for ( i = 0 ; i < numColorArgs ; i++ ) {
 380       state[used++] = (_3DSTATE_MAP_BLEND_ARG_CMD(blendUnit) |
 381                        tex_blend_rgb[i] | args_RGB[i]);
 382    }
 383
 384    for ( i = 0 ; i < numAlphaArgs ; i++ ) {
 385       state[used++] = (_3DSTATE_MAP_BLEND_ARG_CMD(blendUnit) |
 386                        tex_blend_a[i] | args_A[i]);
 387    }
 388
 389
 390    if (need_factor)
 391       return emit_factor( blendUnit, state, used, factor );
 392    else
 393       return used;
 394 }
 395
 396
 397 static void emit_texblend( i830ContextPtr i830, GLuint unit, GLuint blendUnit,
 398                            GLboolean last_stage )
 399 {
 400    struct gl_texture_unit *texUnit = &i830->intel.ctx.Texture.Unit[unit];
 401    GLuint tmp[I830_TEXBLEND_SIZE], tmp_sz;
 402
 403
 404    if (0) fprintf(stderr, "%s unit %d\n", __FUNCTION__, unit);
 405
 406    /* Update i830->state.TexBlend
 407     */
 408    tmp_sz = i830SetTexEnvCombine(i830, texUnit->_CurrentCombine, blendUnit,
 409                                  GetTexelOp(unit), tmp,
 410                                  texUnit->EnvColor );
 411
 412    if (last_stage)
 413       tmp[0] |= TEXOP_LAST_STAGE;
 414
 415    if (tmp_sz != i830->state.TexBlendWordsUsed[blendUnit] ||
 416        memcmp( tmp, i830->state.TexBlend[blendUnit], tmp_sz * sizeof(GLuint))) {
 417
 418       I830_STATECHANGE( i830, I830_UPLOAD_TEXBLEND(blendUnit) );
 419       memcpy( i830->state.TexBlend[blendUnit], tmp, tmp_sz * sizeof(GLuint));
 420       i830->state.TexBlendWordsUsed[blendUnit] = tmp_sz;
 421    }
 422
 423    I830_ACTIVESTATE(i830, I830_UPLOAD_TEXBLEND(blendUnit), GL_TRUE);
 424 }
 425
 426 static void emit_passthrough( i830ContextPtr i830 )
 427 {
 428    GLuint tmp[I830_TEXBLEND_SIZE], tmp_sz;
 429    GLuint unit = 0;
 430
 431    tmp_sz = pass_through( tmp, unit );
 432    tmp[0] |= TEXOP_LAST_STAGE;
 433
 434    if (tmp_sz != i830->state.TexBlendWordsUsed[unit] ||
 435        memcmp( tmp, i830->state.TexBlend[unit], tmp_sz * sizeof(GLuint))) {
 436
 437       I830_STATECHANGE( i830, I830_UPLOAD_TEXBLEND(unit) );
 438       memcpy( i830->state.TexBlend[unit], tmp, tmp_sz * sizeof(GLuint));
 439       i830->state.TexBlendWordsUsed[unit] = tmp_sz;
 440    }
 441
 442    I830_ACTIVESTATE(i830, I830_UPLOAD_TEXBLEND(unit), GL_TRUE);
 443 }
 444
 445 void i830EmitTextureBlend( i830ContextPtr i830 )
 446 {
 447    GLcontext *ctx = &i830->intel.ctx;
 448    GLuint unit, last_stage = 0, blendunit = 0;
 449
 450    I830_ACTIVESTATE(i830, I830_UPLOAD_TEXBLEND_ALL, GL_FALSE);
 451
 452    if (ctx->Texture._EnabledUnits) {
 453       for (unit = 0 ; unit < ctx->Const.MaxTextureUnits ; unit++)
 454          if (ctx->Texture.Unit[unit]._ReallyEnabled)
 455             last_stage = unit;
 456
 457       for (unit = 0 ; unit < ctx->Const.MaxTextureUnits ; unit++)
 458          if (ctx->Texture.Unit[unit]._ReallyEnabled)
 459             emit_texblend( i830, unit, blendunit++, last_stage == unit );
 460    }
 461    else {
 462       emit_passthrough( i830 );
 463    }
 464 }
 465