src/gallium/drivers/i915/i915_fpc_emit.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2003 VMware, Inc.
   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 VMWARE 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 "i915_reg.h"
  29 #include "i915_context.h"
  30 #include "i915_fpc.h"
  31 #include "util/u_math.h"
  32
  33 uint
  34 i915_get_temp(struct i915_fp_compile *p)
  35 {
  36    int bit = ffs(~p->temp_flag);
  37    if (!bit) {
  38       i915_program_error(p, "i915_get_temp: out of temporaries");
  39       return 0;
  40    }
  41
  42    p->temp_flag |= 1 << (bit - 1);
  43    return bit - 1;
  44 }
  45
  46
  47 static void
  48 i915_release_temp(struct i915_fp_compile *p, int reg)
  49 {
  50    p->temp_flag &= ~(1 << reg);
  51 }
  52
  53
  54 /**
  55  * Get unpreserved temporary, a temp whose value is not preserved between
  56  * PS program phases.
  57  */
  58 uint
  59 i915_get_utemp(struct i915_fp_compile * p)
  60 {
  61    int bit = ffs(~p->utemp_flag);
  62    if (!bit) {
  63       i915_program_error(p, "i915_get_utemp: out of temporaries");
  64       return 0;
  65    }
  66
  67    p->utemp_flag |= 1 << (bit - 1);
  68    return UREG(REG_TYPE_U, (bit - 1));
  69 }
  70
  71 void
  72 i915_release_utemps(struct i915_fp_compile *p)
  73 {
  74    p->utemp_flag = ~0x7;
  75 }
  76
  77
  78 uint
  79 i915_emit_decl(struct i915_fp_compile *p,
  80                uint type, uint nr, uint d0_flags)
  81 {
  82    uint reg = UREG(type, nr);
  83
  84    if (type == REG_TYPE_T) {
  85       if (p->decl_t & (1 << nr))
  86          return reg;
  87
  88       p->decl_t |= (1 << nr);
  89    }
  90    else if (type == REG_TYPE_S) {
  91       if (p->decl_s & (1 << nr))
  92          return reg;
  93
  94       p->decl_s |= (1 << nr);
  95    }
  96    else
  97       return reg;
  98
  99    if (p->decl< p->declarations + I915_PROGRAM_SIZE) {
 100       *(p->decl++) = (D0_DCL | D0_DEST(reg) | d0_flags);
 101       *(p->decl++) = D1_MBZ;
 102       *(p->decl++) = D2_MBZ;
 103    }
 104    else
 105       i915_program_error(p, "Out of declarations");
 106
 107    p->nr_decl_insn++;
 108    return reg;
 109 }
 110
 111 uint
 112 i915_emit_arith(struct i915_fp_compile * p,
 113                 uint op,
 114                 uint dest,
 115                 uint mask,
 116                 uint saturate, uint src0, uint src1, uint src2)
 117 {
 118    uint c[3];
 119    uint nr_const = 0;
 120
 121    assert(GET_UREG_TYPE(dest) != REG_TYPE_CONST);
 122    dest = UREG(GET_UREG_TYPE(dest), GET_UREG_NR(dest));
 123    assert(dest);
 124
 125    if (GET_UREG_TYPE(src0) == REG_TYPE_CONST)
 126       c[nr_const++] = 0;
 127    if (GET_UREG_TYPE(src1) == REG_TYPE_CONST)
 128       c[nr_const++] = 1;
 129    if (GET_UREG_TYPE(src2) == REG_TYPE_CONST)
 130       c[nr_const++] = 2;
 131
 132    /* Recursively call this function to MOV additional const values
 133     * into temporary registers.  Use utemp registers for this -
 134     * currently shouldn't be possible to run out, but keep an eye on
 135     * this.
 136     */
 137    if (nr_const > 1) {
 138       uint s[3], first, i, old_utemp_flag;
 139
 140       s[0] = src0;
 141       s[1] = src1;
 142       s[2] = src2;
 143       old_utemp_flag = p->utemp_flag;
 144
 145       first = GET_UREG_NR(s[c[0]]);
 146       for (i = 1; i < nr_const; i++) {
 147          if (GET_UREG_NR(s[c[i]]) != first) {
 148             uint tmp = i915_get_utemp(p);
 149
 150             i915_emit_arith(p, A0_MOV, tmp, A0_DEST_CHANNEL_ALL, 0,
 151                             s[c[i]], 0, 0);
 152             s[c[i]] = tmp;
 153          }
 154       }
 155
 156       src0 = s[0];
 157       src1 = s[1];
 158       src2 = s[2];
 159       p->utemp_flag = old_utemp_flag;   /* restore */
 160    }
 161
 162    if (p->csr< p->program + I915_PROGRAM_SIZE) {
 163       *(p->csr++) = (op | A0_DEST(dest) | mask | saturate | A0_SRC0(src0));
 164       *(p->csr++) = (A1_SRC0(src0) | A1_SRC1(src1));
 165       *(p->csr++) = (A2_SRC1(src1) | A2_SRC2(src2));
 166    }
 167    else
 168       i915_program_error(p, "Out of instructions");
 169
 170    if (GET_UREG_TYPE(dest) == REG_TYPE_R)
 171       p->register_phases[GET_UREG_NR(dest)] = p->nr_tex_indirect;
 172
 173    p->nr_alu_insn++;
 174    return dest;
 175 }
 176
 177
 178 /**
 179  * Emit a texture load or texkill instruction.
 180  * \param dest  the dest i915 register
 181  * \param destmask  the dest register writemask
 182  * \param sampler  the i915 sampler register
 183  * \param coord  the i915 source texcoord operand
 184  * \param opcode  the instruction opcode
 185  */
 186 uint i915_emit_texld( struct i915_fp_compile *p,
 187                       uint dest,
 188                       uint destmask,
 189                       uint sampler,
 190                       uint coord,
 191                       uint opcode,
 192                       uint num_coord )
 193 {
 194    const uint k = UREG(GET_UREG_TYPE(coord), GET_UREG_NR(coord));
 195
 196    int temp = -1;
 197    uint ignore = 0;
 198
 199    /* Eliminate the useless texture coordinates. Otherwise we end up generating
 200     * a swizzle for no reason below. */
 201    switch(num_coord) {
 202       case 0:
 203          ignore |= (0xf << UREG_CHANNEL_X_SHIFT);
 204          /* fall-through */
 205       case 1:
 206          ignore |= (0xf << UREG_CHANNEL_Y_SHIFT);
 207          /* fall-through */
 208       case 2:
 209          ignore |= (0xf << UREG_CHANNEL_Z_SHIFT);
 210          /* fall-through */
 211       case 3:
 212          ignore |= (0xf << UREG_CHANNEL_W_SHIFT);
 213    }
 214
 215    if ( (coord & ~ignore ) != (k & ~ignore) ) {
 216       /* texcoord is swizzled or negated.  Need to allocate a new temporary
 217        * register (a utemp / unpreserved temp) won't do.
 218        */
 219       uint tempReg;
 220
 221       temp = i915_get_temp(p);           /* get temp reg index */
 222       tempReg = UREG(REG_TYPE_R, temp);  /* make i915 register */
 223
 224       i915_emit_arith( p, A0_MOV,
 225                        tempReg, A0_DEST_CHANNEL_ALL, /* dest reg, writemask */
 226                        0,                            /* saturate */
 227                        coord, 0, 0 );                /* src0, src1, src2 */
 228
 229       /* new src texcoord is tempReg */
 230       coord = tempReg;
 231    }
 232
 233    /* Don't worry about saturate as we only support
 234     */
 235    if (destmask != A0_DEST_CHANNEL_ALL) {
 236       /* if not writing to XYZW... */
 237       uint tmp = i915_get_utemp(p);
 238       i915_emit_texld( p, tmp, A0_DEST_CHANNEL_ALL, sampler, coord, opcode, num_coord );
 239       i915_emit_arith( p, A0_MOV, dest, destmask, 0, tmp, 0, 0 );
 240       /* XXX release utemp here? */
 241    }
 242    else {
 243       assert(GET_UREG_TYPE(dest) != REG_TYPE_CONST);
 244       assert(dest == UREG(GET_UREG_TYPE(dest), GET_UREG_NR(dest)));
 245
 246       /* Output register being oC or oD defines a phase boundary */
 247       if (GET_UREG_TYPE(dest) == REG_TYPE_OC ||
 248           GET_UREG_TYPE(dest) == REG_TYPE_OD)
 249          p->nr_tex_indirect++;
 250
 251       /* Reading from an r# register whose contents depend on output of the
 252        * current phase defines a phase boundary.
 253        */
 254       if (GET_UREG_TYPE(coord) == REG_TYPE_R &&
 255           p->register_phases[GET_UREG_NR(coord)] == p->nr_tex_indirect)
 256          p->nr_tex_indirect++;
 257
 258       if (p->csr< p->program + I915_PROGRAM_SIZE) {
 259          *(p->csr++) = (opcode |
 260                         T0_DEST( dest ) |
 261                         T0_SAMPLER( sampler ));
 262
 263          *(p->csr++) = T1_ADDRESS_REG( coord );
 264          *(p->csr++) = T2_MBZ;
 265       }
 266       else
 267          i915_program_error(p, "Out of instructions");
 268
 269       if (GET_UREG_TYPE(dest) == REG_TYPE_R)
 270          p->register_phases[GET_UREG_NR(dest)] = p->nr_tex_indirect;
 271
 272       p->nr_tex_insn++;
 273    }
 274
 275    if (temp >= 0)
 276       i915_release_temp(p, temp);
 277
 278    return dest;
 279 }
 280
 281
 282 uint
 283 i915_emit_const1f(struct i915_fp_compile * p, float c0)
 284 {
 285    struct i915_fragment_shader *ifs = p->shader;
 286    unsigned reg, idx;
 287
 288    if (c0 == 0.0)
 289       return swizzle(UREG(REG_TYPE_R, 0), ZERO, ZERO, ZERO, ZERO);
 290    if (c0 == 1.0)
 291       return swizzle(UREG(REG_TYPE_R, 0), ONE, ONE, ONE, ONE);
 292
 293    for (reg = 0; reg < I915_MAX_CONSTANT; reg++) {
 294       if (ifs->constant_flags[reg] == I915_CONSTFLAG_USER)
 295          continue;
 296       for (idx = 0; idx < 4; idx++) {
 297          if (!(ifs->constant_flags[reg] & (1 << idx)) ||
 298              ifs->constants[reg][idx] == c0) {
 299             ifs->constants[reg][idx] = c0;
 300             ifs->constant_flags[reg] |= 1 << idx;
 301             if (reg + 1 > ifs->num_constants)
 302                ifs->num_constants = reg + 1;
 303             return swizzle(UREG(REG_TYPE_CONST, reg), idx, ZERO, ZERO, ONE);
 304          }
 305       }
 306    }
 307
 308    i915_program_error(p, "i915_emit_const1f: out of constants");
 309    return 0;
 310 }
 311
 312 uint
 313 i915_emit_const2f(struct i915_fp_compile * p, float c0, float c1)
 314 {
 315    struct i915_fragment_shader *ifs = p->shader;
 316    unsigned reg, idx;
 317
 318    if (c0 == 0.0)
 319       return swizzle(i915_emit_const1f(p, c1), ZERO, X, Z, W);
 320    if (c0 == 1.0)
 321       return swizzle(i915_emit_const1f(p, c1), ONE, X, Z, W);
 322
 323    if (c1 == 0.0)
 324       return swizzle(i915_emit_const1f(p, c0), X, ZERO, Z, W);
 325    if (c1 == 1.0)
 326       return swizzle(i915_emit_const1f(p, c0), X, ONE, Z, W);
 327
 328    // XXX emit swizzle here for 0, 1, -1 and any combination thereof
 329    // we can use swizzle + neg for that
 330    for (reg = 0; reg < I915_MAX_CONSTANT; reg++) {
 331       if (ifs->constant_flags[reg] == 0xf ||
 332           ifs->constant_flags[reg] == I915_CONSTFLAG_USER)
 333          continue;
 334       for (idx = 0; idx < 3; idx++) {
 335          if (!(ifs->constant_flags[reg] & (3 << idx))) {
 336             ifs->constants[reg][idx + 0] = c0;
 337             ifs->constants[reg][idx + 1] = c1;
 338             ifs->constant_flags[reg] |= 3 << idx;
 339             if (reg + 1 > ifs->num_constants)
 340                ifs->num_constants = reg + 1;
 341             return swizzle(UREG(REG_TYPE_CONST, reg), idx, idx + 1, ZERO, ONE);
 342          }
 343       }
 344    }
 345
 346    i915_program_error(p, "i915_emit_const2f: out of constants");
 347    return 0;
 348 }
 349
 350 uint
 351 i915_emit_const4f(struct i915_fp_compile * p,
 352                   float c0, float c1, float c2, float c3)
 353 {
 354    struct i915_fragment_shader *ifs = p->shader;
 355    unsigned reg;
 356
 357    // XXX emit swizzle here for 0, 1, -1 and any combination thereof
 358    // we can use swizzle + neg for that
 359    for (reg = 0; reg < I915_MAX_CONSTANT; reg++) {
 360       if (ifs->constant_flags[reg] == 0xf &&
 361           ifs->constants[reg][0] == c0 &&
 362           ifs->constants[reg][1] == c1 &&
 363           ifs->constants[reg][2] == c2 &&
 364           ifs->constants[reg][3] == c3) {
 365          return UREG(REG_TYPE_CONST, reg);
 366       }
 367       else if (ifs->constant_flags[reg] == 0) {
 368
 369          ifs->constants[reg][0] = c0;
 370          ifs->constants[reg][1] = c1;
 371          ifs->constants[reg][2] = c2;
 372          ifs->constants[reg][3] = c3;
 373          ifs->constant_flags[reg] = 0xf;
 374          if (reg + 1 > ifs->num_constants)
 375             ifs->num_constants = reg + 1;
 376          return UREG(REG_TYPE_CONST, reg);
 377       }
 378    }
 379
 380    i915_program_error(p, "i915_emit_const4f: out of constants");
 381    return 0;
 382 }
 383
 384
 385 uint
 386 i915_emit_const4fv(struct i915_fp_compile * p, const float * c)
 387 {
 388    return i915_emit_const4f(p, c[0], c[1], c[2], c[3]);
 389 }