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/**************************************************************************

 *

 * Copyright 2003 VMware, Inc.

 * All Rights Reserved.

 *

 * Permission is hereby granted, free of charge, to any person obtaining a

 * copy of this software and associated documentation files (the

 * "Software"), to deal in the Software without restriction, including

 * without limitation the rights to use, copy, modify, merge, publish,

 * distribute, sub license, and/or sell copies of the Software, and to

 * permit persons to whom the Software is furnished to do so, subject to

 * the following conditions:

 *

 * The above copyright notice and this permission notice (including the

 * next paragraph) shall be included in all copies or substantial portions

 * of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS

 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF

 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.

 * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR

 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,

 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE

 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

 *

 **************************************************************************/

#include "i915_reg.h"

#include "i915_context.h"

#include "i915_fpc.h"

#include "util/u_math.h"

uint

i915_get_temp(struct i915_fp_compile *p)

{

   int bit = ffs(~p->temp_flag);

   if (!bit) {

      i915_program_error(p, "i915_get_temp: out of temporaries");

      return 0;

   }

   p->temp_flag |= 1 << (bit - 1);

   return bit - 1;

}

static void

i915_release_temp(struct i915_fp_compile *p, int reg)

{

   p->temp_flag &= ~(1 << reg);

}

/**

 * Get unpreserved temporary, a temp whose value is not preserved between

 * PS program phases.

 */

uint

i915_get_utemp(struct i915_fp_compile * p)

{

   int bit = ffs(~p->utemp_flag);

   if (!bit) {

      i915_program_error(p, "i915_get_utemp: out of temporaries");

      return 0;

   }

   p->utemp_flag |= 1 << (bit - 1);

   return UREG(REG_TYPE_U, (bit - 1));

}

void

i915_release_utemps(struct i915_fp_compile *p)

{

   p->utemp_flag = ~0x7;

}

uint

i915_emit_decl(struct i915_fp_compile *p,

               uint type, uint nr, uint d0_flags)

{

   uint reg = UREG(type, nr);

   if (type == REG_TYPE_T) {

      if (p->decl_t & (1 << nr))

         return reg;

      p->decl_t |= (1 << nr);

   }

   else if (type == REG_TYPE_S) {

      if (p->decl_s & (1 << nr))

         return reg;

      p->decl_s |= (1 << nr);

   }

   else

      return reg;

   if (p->decl< p->declarations + I915_PROGRAM_SIZE) {

      *(p->decl++) = (D0_DCL | D0_DEST(reg) | d0_flags);

      *(p->decl++) = D1_MBZ;

      *(p->decl++) = D2_MBZ;

   }

   else

      i915_program_error(p, "Out of declarations");

   p->nr_decl_insn++;

   return reg;

}

uint

i915_emit_arith(struct i915_fp_compile * p,

                uint op,

                uint dest,

                uint mask,

                uint saturate, uint src0, uint src1, uint src2)

{

   uint c[3];

   uint nr_const = 0;

   assert(GET_UREG_TYPE(dest) != REG_TYPE_CONST);

   dest = UREG(GET_UREG_TYPE(dest), GET_UREG_NR(dest));

   assert(dest);

   if (GET_UREG_TYPE(src0) == REG_TYPE_CONST)

      c[nr_const++] = 0;

   if (GET_UREG_TYPE(src1) == REG_TYPE_CONST)

      c[nr_const++] = 1;

   if (GET_UREG_TYPE(src2) == REG_TYPE_CONST)

      c[nr_const++] = 2;

   /* Recursively call this function to MOV additional const values

    * into temporary registers.  Use utemp registers for this -

    * currently shouldn't be possible to run out, but keep an eye on

    * this.

    */

   if (nr_const > 1) {

      uint s[3], first, i, old_utemp_flag;

      s[0] = src0;

      s[1] = src1;

      s[2] = src2;

      old_utemp_flag = p->utemp_flag;

      first = GET_UREG_NR(s[c[0]]);

      for (i = 1; i < nr_const; i++) {

         if (GET_UREG_NR(s[c[i]]) != first) {

            uint tmp = i915_get_utemp(p);

            i915_emit_arith(p, A0_MOV, tmp, A0_DEST_CHANNEL_ALL, 0,

                            s[c[i]], 0, 0);

            s[c[i]] = tmp;

         }

      }

      src0 = s[0];

      src1 = s[1];

      src2 = s[2];

      p->utemp_flag = old_utemp_flag;   /* restore */

   }

   if (p->csr< p->program + I915_PROGRAM_SIZE) {

      *(p->csr++) = (op | A0_DEST(dest) | mask | saturate | A0_SRC0(src0));

      *(p->csr++) = (A1_SRC0(src0) | A1_SRC1(src1));

      *(p->csr++) = (A2_SRC1(src1) | A2_SRC2(src2));

   }

   else

      i915_program_error(p, "Out of instructions");

   if (GET_UREG_TYPE(dest) == REG_TYPE_R)

      p->register_phases[GET_UREG_NR(dest)] = p->nr_tex_indirect;

   p->nr_alu_insn++;

   return dest;

}

/**

 * Emit a texture load or texkill instruction.

 * \param dest  the dest i915 register

 * \param destmask  the dest register writemask

 * \param sampler  the i915 sampler register

 * \param coord  the i915 source texcoord operand

 * \param opcode  the instruction opcode

 */

uint i915_emit_texld( struct i915_fp_compile *p,

                      uint dest,

                      uint destmask,

                      uint sampler,

                      uint coord,

                      uint opcode,

                      uint num_coord )

{

   const uint k = UREG(GET_UREG_TYPE(coord), GET_UREG_NR(coord));

   int temp = -1;

   uint ignore = 0;

   /* Eliminate the useless texture coordinates. Otherwise we end up generating

    * a swizzle for no reason below. */

   switch(num_coord) {

      case 0:

         ignore |= (0xf << UREG_CHANNEL_X_SHIFT);

         /* fall-through */

      case 1:

         ignore |= (0xf << UREG_CHANNEL_Y_SHIFT);

         /* fall-through */

      case 2:

         ignore |= (0xf << UREG_CHANNEL_Z_SHIFT);

         /* fall-through */

      case 3:

         ignore |= (0xf << UREG_CHANNEL_W_SHIFT);

   }

   if ( (coord & ~ignore ) != (k & ~ignore) ) {

      /* texcoord is swizzled or negated.  Need to allocate a new temporary

       * register (a utemp / unpreserved temp) won't do.

       */

      uint tempReg;

      temp = i915_get_temp(p);           /* get temp reg index */

      tempReg = UREG(REG_TYPE_R, temp);  /* make i915 register */

      i915_emit_arith( p, A0_MOV,

                       tempReg, A0_DEST_CHANNEL_ALL, /* dest reg, writemask */

                       0,                            /* saturate */

                       coord, 0, 0 );                /* src0, src1, src2 */

      /* new src texcoord is tempReg */

      coord = tempReg;

   }

   /* Don't worry about saturate as we only support

    */

   if (destmask != A0_DEST_CHANNEL_ALL) {

      /* if not writing to XYZW... */

      uint tmp = i915_get_utemp(p);

      i915_emit_texld( p, tmp, A0_DEST_CHANNEL_ALL, sampler, coord, opcode, num_coord );

      i915_emit_arith( p, A0_MOV, dest, destmask, 0, tmp, 0, 0 );

      /* XXX release utemp here? */

   }

   else {

      assert(GET_UREG_TYPE(dest) != REG_TYPE_CONST);

      assert(dest == UREG(GET_UREG_TYPE(dest), GET_UREG_NR(dest)));

      /* Output register being oC or oD defines a phase boundary */

      if (GET_UREG_TYPE(dest) == REG_TYPE_OC ||

          GET_UREG_TYPE(dest) == REG_TYPE_OD)

         p->nr_tex_indirect++;

      /* Reading from an r# register whose contents depend on output of the

       * current phase defines a phase boundary.

       */

      if (GET_UREG_TYPE(coord) == REG_TYPE_R &&

          p->register_phases[GET_UREG_NR(coord)] == p->nr_tex_indirect)

         p->nr_tex_indirect++;

      if (p->csr< p->program + I915_PROGRAM_SIZE) {

         *(p->csr++) = (opcode |

                        T0_DEST( dest ) |

                        T0_SAMPLER( sampler ));

         *(p->csr++) = T1_ADDRESS_REG( coord );

         *(p->csr++) = T2_MBZ;

      }

      else

         i915_program_error(p, "Out of instructions");

      if (GET_UREG_TYPE(dest) == REG_TYPE_R)

         p->register_phases[GET_UREG_NR(dest)] = p->nr_tex_indirect;

      p->nr_tex_insn++;

   }

   if (temp >= 0)

      i915_release_temp(p, temp);

   return dest;

}

uint

i915_emit_const1f(struct i915_fp_compile * p, float c0)

{

   struct i915_fragment_shader *ifs = p->shader;

   unsigned reg, idx;

   if (c0 == 0.0)

      return swizzle(UREG(REG_TYPE_R, 0), ZERO, ZERO, ZERO, ZERO);

   if (c0 == 1.0)

      return swizzle(UREG(REG_TYPE_R, 0), ONE, ONE, ONE, ONE);

   for (reg = 0; reg < I915_MAX_CONSTANT; reg++) {

      if (ifs->constant_flags[reg] == I915_CONSTFLAG_USER)

         continue;

      for (idx = 0; idx < 4; idx++) {

         if (!(ifs->constant_flags[reg] & (1 << idx)) ||

             ifs->constants[reg][idx] == c0) {

            ifs->constants[reg][idx] = c0;

            ifs->constant_flags[reg] |= 1 << idx;

            if (reg + 1 > ifs->num_constants)

               ifs->num_constants = reg + 1;

            return swizzle(UREG(REG_TYPE_CONST, reg), idx, ZERO, ZERO, ONE);

         }

      }

   }

   i915_program_error(p, "i915_emit_const1f: out of constants");

   return 0;

}

uint

i915_emit_const2f(struct i915_fp_compile * p, float c0, float c1)

{

   struct i915_fragment_shader *ifs = p->shader;

   unsigned reg, idx;

   if (c0 == 0.0)

      return swizzle(i915_emit_const1f(p, c1), ZERO, X, Z, W);

   if (c0 == 1.0)

      return swizzle(i915_emit_const1f(p, c1), ONE, X, Z, W);

   if (c1 == 0.0)

      return swizzle(i915_emit_const1f(p, c0), X, ZERO, Z, W);

   if (c1 == 1.0)

      return swizzle(i915_emit_const1f(p, c0), X, ONE, Z, W);

   // XXX emit swizzle here for 0, 1, -1 and any combination thereof

   // we can use swizzle + neg for that

   for (reg = 0; reg < I915_MAX_CONSTANT; reg++) {

      if (ifs->constant_flags[reg] == 0xf ||

          ifs->constant_flags[reg] == I915_CONSTFLAG_USER)

         continue;

      for (idx = 0; idx < 3; idx++) {

         if (!(ifs->constant_flags[reg] & (3 << idx))) {

            ifs->constants[reg][idx + 0] = c0;

            ifs->constants[reg][idx + 1] = c1;

            ifs->constant_flags[reg] |= 3 << idx;

            if (reg + 1 > ifs->num_constants)

               ifs->num_constants = reg + 1;

            return swizzle(UREG(REG_TYPE_CONST, reg), idx, idx + 1, ZERO, ONE);

         }

      }

   }

   i915_program_error(p, "i915_emit_const2f: out of constants");

   return 0;

}

uint

i915_emit_const4f(struct i915_fp_compile * p,

                  float c0, float c1, float c2, float c3)

{

   struct i915_fragment_shader *ifs = p->shader;

   unsigned reg;

   // XXX emit swizzle here for 0, 1, -1 and any combination thereof

   // we can use swizzle + neg for that

   for (reg = 0; reg < I915_MAX_CONSTANT; reg++) {

      if (ifs->constant_flags[reg] == 0xf &&

          ifs->constants[reg][0] == c0 &&

          ifs->constants[reg][1] == c1 &&

          ifs->constants[reg][2] == c2 &&

          ifs->constants[reg][3] == c3) {

         return UREG(REG_TYPE_CONST, reg);

      }

      else if (ifs->constant_flags[reg] == 0) {

         ifs->constants[reg][0] = c0;

         ifs->constants[reg][1] = c1;

         ifs->constants[reg][2] = c2;

         ifs->constants[reg][3] = c3;

         ifs->constant_flags[reg] = 0xf;

         if (reg + 1 > ifs->num_constants)

            ifs->num_constants = reg + 1;

         return UREG(REG_TYPE_CONST, reg);

      }

   }

   i915_program_error(p, "i915_emit_const4f: out of constants");

   return 0;

}

uint

i915_emit_const4fv(struct i915_fp_compile * p, const float * c)

{

   return i915_emit_const4f(p, c[0], c[1], c[2], c[3]);

}