src/gallium/drivers/i915/i915_fpc_emit.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 "i915_reg.h"
  29 #include "i915_context.h"
  30 #include "i915_fpc.h"
  31 #include "util/u_math.h"
  32
  33
  34 #define A0_DEST( reg ) (((reg)&UREG_TYPE_NR_MASK)>>UREG_A0_DEST_SHIFT_LEFT)
  35 #define D0_DEST( reg ) (((reg)&UREG_TYPE_NR_MASK)>>UREG_A0_DEST_SHIFT_LEFT)
  36 #define T0_DEST( reg ) (((reg)&UREG_TYPE_NR_MASK)>>UREG_A0_DEST_SHIFT_LEFT)
  37 #define A0_SRC0( reg ) (((reg)&UREG_MASK)>>UREG_A0_SRC0_SHIFT_LEFT)
  38 #define A1_SRC0( reg ) (((reg)&UREG_MASK)<<UREG_A1_SRC0_SHIFT_RIGHT)
  39 #define A1_SRC1( reg ) (((reg)&UREG_MASK)>>UREG_A1_SRC1_SHIFT_LEFT)
  40 #define A2_SRC1( reg ) (((reg)&UREG_MASK)<<UREG_A2_SRC1_SHIFT_RIGHT)
  41 #define A2_SRC2( reg ) (((reg)&UREG_MASK)>>UREG_A2_SRC2_SHIFT_LEFT)
  42
  43 /* These are special, and don't have swizzle/negate bits.
  44  */
  45 #define T0_SAMPLER( reg )     (GET_UREG_NR(reg)<<T0_SAMPLER_NR_SHIFT)
  46 #define T1_ADDRESS_REG( reg ) ((GET_UREG_NR(reg)<<T1_ADDRESS_REG_NR_SHIFT) | \
  47                                (GET_UREG_TYPE(reg)<<T1_ADDRESS_REG_TYPE_SHIFT))
  48
  49
  50 /* Macros for translating UREG's into the various register fields used
  51  * by the I915 programmable unit.
  52  */
  53 #define UREG_A0_DEST_SHIFT_LEFT  (UREG_TYPE_SHIFT - A0_DEST_TYPE_SHIFT)
  54 #define UREG_A0_SRC0_SHIFT_LEFT  (UREG_TYPE_SHIFT - A0_SRC0_TYPE_SHIFT)
  55 #define UREG_A1_SRC0_SHIFT_RIGHT (A1_SRC0_CHANNEL_W_SHIFT - UREG_CHANNEL_W_SHIFT)
  56 #define UREG_A1_SRC1_SHIFT_LEFT  (UREG_TYPE_SHIFT - A1_SRC1_TYPE_SHIFT)
  57 #define UREG_A2_SRC1_SHIFT_RIGHT (A2_SRC1_CHANNEL_W_SHIFT - UREG_CHANNEL_W_SHIFT)
  58 #define UREG_A2_SRC2_SHIFT_LEFT  (UREG_TYPE_SHIFT - A2_SRC2_TYPE_SHIFT)
  59
  60 #define UREG_MASK         0xffffff00
  61 #define UREG_TYPE_NR_MASK ((REG_TYPE_MASK << UREG_TYPE_SHIFT) | \
  62                            (REG_NR_MASK << UREG_NR_SHIFT))
  63
  64
  65 uint
  66 i915_get_temp(struct i915_fp_compile *p)
  67 {
  68    int bit = ffs(~p->temp_flag);
  69    if (!bit) {
  70       i915_program_error(p, "i915_get_temp: out of temporaries\n");
  71       return 0;
  72    }
  73
  74    p->temp_flag |= 1 << (bit - 1);
  75    return bit - 1;
  76 }
  77
  78
  79 static void
  80 i915_release_temp(struct i915_fp_compile *p, int reg)
  81 {
  82    p->temp_flag &= ~(1 << reg);
  83 }
  84
  85
  86 /**
  87  * Get unpreserved temporary, a temp whose value is not preserved between
  88  * PS program phases.
  89  */
  90 uint
  91 i915_get_utemp(struct i915_fp_compile * p)
  92 {
  93    int bit = ffs(~p->utemp_flag);
  94    if (!bit) {
  95       i915_program_error(p, "i915_get_utemp: out of temporaries\n");
  96       return 0;
  97    }
  98
  99    p->utemp_flag |= 1 << (bit - 1);
 100    return UREG(REG_TYPE_U, (bit - 1));
 101 }
 102
 103 void
 104 i915_release_utemps(struct i915_fp_compile *p)
 105 {
 106    p->utemp_flag = ~0x7;
 107 }
 108
 109
 110 uint
 111 i915_emit_decl(struct i915_fp_compile *p,
 112                uint type, uint nr, uint d0_flags)
 113 {
 114    uint reg = UREG(type, nr);
 115
 116    if (type == REG_TYPE_T) {
 117       if (p->decl_t & (1 << nr))
 118          return reg;
 119
 120       p->decl_t |= (1 << nr);
 121    }
 122    else if (type == REG_TYPE_S) {
 123       if (p->decl_s & (1 << nr))
 124          return reg;
 125
 126       p->decl_s |= (1 << nr);
 127    }
 128    else
 129       return reg;
 130
 131    *(p->decl++) = (D0_DCL | D0_DEST(reg) | d0_flags);
 132    *(p->decl++) = D1_MBZ;
 133    *(p->decl++) = D2_MBZ;
 134
 135    p->nr_decl_insn++;
 136    return reg;
 137 }
 138
 139 uint
 140 i915_emit_arith(struct i915_fp_compile * p,
 141                 uint op,
 142                 uint dest,
 143                 uint mask,
 144                 uint saturate, uint src0, uint src1, uint src2)
 145 {
 146    uint c[3];
 147    uint nr_const = 0;
 148
 149    assert(GET_UREG_TYPE(dest) != REG_TYPE_CONST);
 150    dest = UREG(GET_UREG_TYPE(dest), GET_UREG_NR(dest));
 151    assert(dest);
 152
 153    if (GET_UREG_TYPE(src0) == REG_TYPE_CONST)
 154       c[nr_const++] = 0;
 155    if (GET_UREG_TYPE(src1) == REG_TYPE_CONST)
 156       c[nr_const++] = 1;
 157    if (GET_UREG_TYPE(src2) == REG_TYPE_CONST)
 158       c[nr_const++] = 2;
 159
 160    /* Recursively call this function to MOV additional const values
 161     * into temporary registers.  Use utemp registers for this -
 162     * currently shouldn't be possible to run out, but keep an eye on
 163     * this.
 164     */
 165    if (nr_const > 1) {
 166       uint s[3], first, i, old_utemp_flag;
 167
 168       s[0] = src0;
 169       s[1] = src1;
 170       s[2] = src2;
 171       old_utemp_flag = p->utemp_flag;
 172
 173       first = GET_UREG_NR(s[c[0]]);
 174       for (i = 1; i < nr_const; i++) {
 175          if (GET_UREG_NR(s[c[i]]) != first) {
 176             uint tmp = i915_get_utemp(p);
 177
 178             i915_emit_arith(p, A0_MOV, tmp, A0_DEST_CHANNEL_ALL, 0,
 179                             s[c[i]], 0, 0);
 180             s[c[i]] = tmp;
 181          }
 182       }
 183
 184       src0 = s[0];
 185       src1 = s[1];
 186       src2 = s[2];
 187       p->utemp_flag = old_utemp_flag;   /* restore */
 188    }
 189
 190    *(p->csr++) = (op | A0_DEST(dest) | mask | saturate | A0_SRC0(src0));
 191    *(p->csr++) = (A1_SRC0(src0) | A1_SRC1(src1));
 192    *(p->csr++) = (A2_SRC1(src1) | A2_SRC2(src2));
 193
 194    p->nr_alu_insn++;
 195    return dest;
 196 }
 197
 198
 199 /**
 200  * Emit a texture load or texkill instruction.
 201  * \param dest  the dest i915 register
 202  * \param destmask  the dest register writemask
 203  * \param sampler  the i915 sampler register
 204  * \param coord  the i915 source texcoord operand
 205  * \param opcode  the instruction opcode
 206  */
 207 uint i915_emit_texld( struct i915_fp_compile *p,
 208                         uint dest,
 209                         uint destmask,
 210                         uint sampler,
 211                         uint coord,
 212                         uint opcode )
 213 {
 214    const uint k = UREG(GET_UREG_TYPE(coord), GET_UREG_NR(coord));
 215    int temp = -1;
 216
 217    if (coord != k) {
 218       /* texcoord is swizzled or negated.  Need to allocate a new temporary
 219        * register (a utemp / unpreserved temp) won't do.
 220        */
 221       uint tempReg;
 222
 223       temp = i915_get_temp(p);           /* get temp reg index */
 224       tempReg = UREG(REG_TYPE_R, temp);  /* make i915 register */
 225
 226       i915_emit_arith( p, A0_MOV,
 227                        tempReg, A0_DEST_CHANNEL_ALL, /* dest reg, writemask */
 228                        0,                            /* saturate */
 229                        coord, 0, 0 );                /* src0, src1, src2 */
 230
 231       /* new src texcoord is tempReg */
 232       coord = tempReg;
 233    }
 234
 235    /* Don't worry about saturate as we only support
 236     */
 237    if (destmask != A0_DEST_CHANNEL_ALL) {
 238       /* if not writing to XYZW... */
 239       uint tmp = i915_get_utemp(p);
 240       i915_emit_texld( p, tmp, A0_DEST_CHANNEL_ALL, sampler, coord, opcode );
 241       i915_emit_arith( p, A0_MOV, dest, destmask, 0, tmp, 0, 0 );
 242       /* XXX release utemp here? */
 243    }
 244    else {
 245       assert(GET_UREG_TYPE(dest) != REG_TYPE_CONST);
 246       assert(dest == UREG(GET_UREG_TYPE(dest), GET_UREG_NR(dest)));
 247
 248       /* is the sampler coord a texcoord input reg? */
 249       if (GET_UREG_TYPE(coord) != REG_TYPE_T) {
 250          p->nr_tex_indirect++;
 251       }
 252
 253       *(p->csr++) = (opcode |
 254                      T0_DEST( dest ) |
 255                      T0_SAMPLER( sampler ));
 256
 257       *(p->csr++) = T1_ADDRESS_REG( coord );
 258       *(p->csr++) = T2_MBZ;
 259
 260       p->nr_tex_insn++;
 261    }
 262
 263    if (temp >= 0)
 264       i915_release_temp(p, temp);
 265
 266    return dest;
 267 }
 268
 269
 270 uint
 271 i915_emit_const1f(struct i915_fp_compile * p, float c0)
 272 {
 273    struct i915_fragment_shader *ifs = p->shader;
 274    unsigned reg, idx;
 275
 276    if (c0 == 0.0)
 277       return swizzle(UREG(REG_TYPE_R, 0), ZERO, ZERO, ZERO, ZERO);
 278    if (c0 == 1.0)
 279       return swizzle(UREG(REG_TYPE_R, 0), ONE, ONE, ONE, ONE);
 280
 281    for (reg = 0; reg < I915_MAX_CONSTANT; reg++) {
 282       if (ifs->constant_flags[reg] == I915_CONSTFLAG_USER)
 283          continue;
 284       for (idx = 0; idx < 4; idx++) {
 285          if (!(ifs->constant_flags[reg] & (1 << idx)) ||
 286              ifs->constants[reg][idx] == c0) {
 287             ifs->constants[reg][idx] = c0;
 288             ifs->constant_flags[reg] |= 1 << idx;
 289             if (reg + 1 > ifs->num_constants)
 290                ifs->num_constants = reg + 1;
 291             return swizzle(UREG(REG_TYPE_CONST, reg), idx, ZERO, ZERO, ONE);
 292          }
 293       }
 294    }
 295
 296    i915_program_error(p, "i915_emit_const1f: out of constants\n");
 297    return 0;
 298 }
 299
 300 uint
 301 i915_emit_const2f(struct i915_fp_compile * p, float c0, float c1)
 302 {
 303    struct i915_fragment_shader *ifs = p->shader;
 304    unsigned reg, idx;
 305
 306    if (c0 == 0.0)
 307       return swizzle(i915_emit_const1f(p, c1), ZERO, X, Z, W);
 308    if (c0 == 1.0)
 309       return swizzle(i915_emit_const1f(p, c1), ONE, X, Z, W);
 310
 311    if (c1 == 0.0)
 312       return swizzle(i915_emit_const1f(p, c0), X, ZERO, Z, W);
 313    if (c1 == 1.0)
 314       return swizzle(i915_emit_const1f(p, c0), X, ONE, Z, W);
 315
 316    for (reg = 0; reg < I915_MAX_CONSTANT; reg++) {
 317       if (ifs->constant_flags[reg] == 0xf ||
 318           ifs->constant_flags[reg] == I915_CONSTFLAG_USER)
 319          continue;
 320       for (idx = 0; idx < 3; idx++) {
 321          if (!(ifs->constant_flags[reg] & (3 << idx))) {
 322             ifs->constants[reg][idx + 0] = c0;
 323             ifs->constants[reg][idx + 1] = c1;
 324             ifs->constant_flags[reg] |= 3 << idx;
 325             if (reg + 1 > ifs->num_constants)
 326                ifs->num_constants = reg + 1;
 327             return swizzle(UREG(REG_TYPE_CONST, reg), idx, idx + 1, ZERO, ONE);
 328          }
 329       }
 330    }
 331
 332    i915_program_error(p, "i915_emit_const2f: out of constants\n");
 333    return 0;
 334 }
 335
 336
 337
 338 uint
 339 i915_emit_const4f(struct i915_fp_compile * p,
 340                   float c0, float c1, float c2, float c3)
 341 {
 342    struct i915_fragment_shader *ifs = p->shader;
 343    unsigned reg;
 344
 345    for (reg = 0; reg < I915_MAX_CONSTANT; reg++) {
 346       if (ifs->constant_flags[reg] == 0xf &&
 347           ifs->constants[reg][0] == c0 &&
 348           ifs->constants[reg][1] == c1 &&
 349           ifs->constants[reg][2] == c2 &&
 350           ifs->constants[reg][3] == c3) {
 351          return UREG(REG_TYPE_CONST, reg);
 352       }
 353       else if (ifs->constant_flags[reg] == 0) {
 354
 355          ifs->constants[reg][0] = c0;
 356          ifs->constants[reg][1] = c1;
 357          ifs->constants[reg][2] = c2;
 358          ifs->constants[reg][3] = c3;
 359          ifs->constant_flags[reg] = 0xf;
 360          if (reg + 1 > ifs->num_constants)
 361             ifs->num_constants = reg + 1;
 362          return UREG(REG_TYPE_CONST, reg);
 363       }
 364    }
 365
 366    i915_program_error(p, "i915_emit_const4f: out of constants\n");
 367    return 0;
 368 }
 369
 370
 371 uint
 372 i915_emit_const4fv(struct i915_fp_compile * p, const float * c)
 373 {
 374    return i915_emit_const4f(p, c[0], c[1], c[2], c[3]);
 375 }