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