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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 

#include "main/glheader.h"

#include "main/macros.h"

#include "main/enums.h"

#include "tnl/t_context.h"

#include "intel_batchbuffer.h"

#include "i915_reg.h"

#include "i915_context.h"

#include "i915_program.h"

#define A0_DEST( reg ) (((reg)&UREG_TYPE_NR_MASK)>>UREG_A0_DEST_SHIFT_LEFT)

#define D0_DEST( reg ) (((reg)&UREG_TYPE_NR_MASK)>>UREG_A0_DEST_SHIFT_LEFT)

#define T0_DEST( reg ) (((reg)&UREG_TYPE_NR_MASK)>>UREG_A0_DEST_SHIFT_LEFT)

#define A0_SRC0( reg ) (((reg)&UREG_MASK)>>UREG_A0_SRC0_SHIFT_LEFT)

#define A1_SRC0( reg ) (((reg)&UREG_MASK)<

#define A1_SRC1( reg ) (((reg)&UREG_MASK)>>UREG_A1_SRC1_SHIFT_LEFT)

#define A2_SRC1( reg ) (((reg)&UREG_MASK)<

#define A2_SRC2( reg ) (((reg)&UREG_MASK)>>UREG_A2_SRC2_SHIFT_LEFT)

/* These are special, and don't have swizzle/negate bits.

 */

#define T0_SAMPLER( reg )     (GET_UREG_NR(reg)<

#define T1_ADDRESS_REG( reg ) ((GET_UREG_NR(reg)<

			       (GET_UREG_TYPE(reg)<

/* Macros for translating UREG's into the various register fields used

 * by the I915 programmable unit.

 */

#define UREG_A0_DEST_SHIFT_LEFT  (UREG_TYPE_SHIFT - A0_DEST_TYPE_SHIFT)

#define UREG_A0_SRC0_SHIFT_LEFT  (UREG_TYPE_SHIFT - A0_SRC0_TYPE_SHIFT)

#define UREG_A1_SRC0_SHIFT_RIGHT (A1_SRC0_CHANNEL_W_SHIFT - UREG_CHANNEL_W_SHIFT)

#define UREG_A1_SRC1_SHIFT_LEFT  (UREG_TYPE_SHIFT - A1_SRC1_TYPE_SHIFT)

#define UREG_A2_SRC1_SHIFT_RIGHT (A2_SRC1_CHANNEL_W_SHIFT - UREG_CHANNEL_W_SHIFT)

#define UREG_A2_SRC2_SHIFT_LEFT  (UREG_TYPE_SHIFT - A2_SRC2_TYPE_SHIFT)

#define UREG_MASK         0xffffff00

#define UREG_TYPE_NR_MASK ((REG_TYPE_MASK << UREG_TYPE_SHIFT) | \

  			   (REG_NR_MASK << UREG_NR_SHIFT))

#define I915_CONSTFLAG_PARAM 0x1f

GLuint

i915_get_temp(struct i915_fragment_program *p)

{

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

   if (!bit) {

      fprintf(stderr, "%s: out of temporaries\n", __FILE__);

      exit(1);

   }

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

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

}

GLuint

i915_get_utemp(struct i915_fragment_program * p)

{

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

   if (!bit) {

      fprintf(stderr, "%s: out of temporaries\n", __FILE__);

      exit(1);

   }

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

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

}

void

i915_release_utemps(struct i915_fragment_program *p)

{

   p->utemp_flag = ~0x7;

}

GLuint

i915_emit_decl(struct i915_fragment_program *p,

               GLuint type, GLuint nr, GLuint d0_flags)

{

   GLuint 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;

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

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

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

   assert(p->decl <= p->declarations + ARRAY_SIZE(p->declarations));

   p->nr_decl_insn++;

   return reg;

}

GLuint

i915_emit_arith(struct i915_fragment_program * p,

                GLuint op,

                GLuint dest,

                GLuint mask,

                GLuint saturate, GLuint src0, GLuint src1, GLuint src2)

{

   GLuint c[3];

   GLuint 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) {

      GLuint 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) {

            GLuint 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 + ARRAY_SIZE(p->program)) {

      i915_program_error(p, "Program contains too many instructions");

      return UREG_BAD;

   }

   *(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));

   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;

}

static GLuint get_free_rreg (struct i915_fragment_program *p,

                             GLuint live_regs)

{

    int bit = ffs(~live_regs);

    if (!bit) {

        i915_program_error(p, "Can't find free R reg");

        return UREG_BAD;

    }

    return UREG(REG_TYPE_R, bit - 1);

}

GLuint i915_emit_texld( struct i915_fragment_program *p,

			GLuint live_regs,

			GLuint dest,

			GLuint destmask,

			GLuint sampler,

			GLuint coord,

			GLuint op )

{

    if (coord != UREG(GET_UREG_TYPE(coord), GET_UREG_NR(coord))) {

        /* With the help of the "needed registers" table created earlier, pick

         * a register we can MOV the swizzled TC to (since TEX doesn't support

         * swizzled sources) */

        GLuint swizCoord = get_free_rreg(p, live_regs);

        if (swizCoord == UREG_BAD)

            return 0;

        i915_emit_arith( p, A0_MOV, swizCoord, A0_DEST_CHANNEL_ALL, 0, coord, 0, 0 );

        coord = swizCoord;

    }

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

    * that are always in the 0..1 range.

    */

   if (destmask != A0_DEST_CHANNEL_ALL) {

      GLuint tmp = i915_get_utemp(p);

      i915_emit_texld( p, 0, tmp, A0_DEST_CHANNEL_ALL, sampler, coord, op );

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

      return dest;

   }

   else {

      assert(GET_UREG_TYPE(dest) != REG_TYPE_CONST);

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

      /* Can't use unsaved temps for coords, as the phase boundary would result

       * in the contents becoming undefined.

       */

      assert(GET_UREG_TYPE(coord) != REG_TYPE_U);

      if ((GET_UREG_TYPE(coord) != REG_TYPE_R) &&

          (GET_UREG_TYPE(coord) != REG_TYPE_OC) &&

          (GET_UREG_TYPE(coord) != REG_TYPE_OD) &&

          (GET_UREG_TYPE(coord) != REG_TYPE_T)) {

          GLuint  tmpCoord = get_free_rreg(p, live_regs);

          if (tmpCoord == UREG_BAD)

              return 0;

          i915_emit_arith(p, A0_MOV, tmpCoord, A0_DEST_CHANNEL_ALL, 0, coord, 0, 0);

          coord = tmpCoord;

      }

      /* 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 + ARRAY_SIZE(p->program)) {

	 i915_program_error(p, "Program contains too many instructions");

	 return UREG_BAD;

      }

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

		     T0_DEST( dest ) |

		     T0_SAMPLER( sampler ));

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

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

      if (GET_UREG_TYPE(dest) == REG_TYPE_R)

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

      p->nr_tex_insn++;

      return dest;

   }

}

GLuint

i915_emit_const1f(struct i915_fragment_program * p, GLfloat c0)

{

   GLint 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 (p->constant_flags[reg] == I915_CONSTFLAG_PARAM)

         continue;

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

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

             p->constant[reg][idx] == c0) {

            p->constant[reg][idx] = c0;

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

            if (reg + 1 > p->nr_constants)

               p->nr_constants = reg + 1;

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

         }

      }

   }

   fprintf(stderr, "%s: out of constants\n", __func__);

   p->error = 1;

   return 0;

}

GLuint

i915_emit_const2f(struct i915_fragment_program * p, GLfloat c0, GLfloat c1)

{

   GLint 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);

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

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

          p->constant_flags[reg] == I915_CONSTFLAG_PARAM)

         continue;

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

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

            p->constant[reg][idx] = c0;

            p->constant[reg][idx + 1] = c1;

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

            if (reg + 1 > p->nr_constants)

               p->nr_constants = reg + 1;

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

                           ONE);

         }

      }

   }

   fprintf(stderr, "%s: out of constants\n", __func__);

   p->error = 1;

   return 0;

}

GLuint

i915_emit_const4f(struct i915_fragment_program * p,

                  GLfloat c0, GLfloat c1, GLfloat c2, GLfloat c3)

{

   GLint reg;

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

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

          p->constant[reg][0] == c0 &&

          p->constant[reg][1] == c1 &&

          p->constant[reg][2] == c2 && p->constant[reg][3] == c3) {

         return UREG(REG_TYPE_CONST, reg);

      }

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

         p->constant[reg][0] = c0;

         p->constant[reg][1] = c1;

         p->constant[reg][2] = c2;

         p->constant[reg][3] = c3;

         p->constant_flags[reg] = 0xf;

         if (reg + 1 > p->nr_constants)

            p->nr_constants = reg + 1;

         return UREG(REG_TYPE_CONST, reg);

      }

   }

   fprintf(stderr, "%s: out of constants\n", __func__);

   p->error = 1;

   return 0;

}

GLuint

i915_emit_const4fv(struct i915_fragment_program * p, const GLfloat * c)

{

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

}

GLuint

i915_emit_param4fv(struct i915_fragment_program * p, const GLfloat * values)

{

   GLint reg, i;

   for (i = 0; i < p->nr_params; i++) {

      if (p->param[i].values == values)

         return UREG(REG_TYPE_CONST, p->param[i].reg);

   }

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

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

         p->constant_flags[reg] = I915_CONSTFLAG_PARAM;

         i = p->nr_params++;

         p->param[i].values = values;

         p->param[i].reg = reg;

         p->params_uptodate = 0;

         if (reg + 1 > p->nr_constants)

            p->nr_constants = reg + 1;

         return UREG(REG_TYPE_CONST, reg);

      }

   }

   fprintf(stderr, "%s: out of constants\n", __func__);

   p->error = 1;

   return 0;

}

/* Warning the user about program errors seems to be quite valuable, from

 * our bug reports.  It unfortunately means piglit reporting errors

 * when we fall back to software due to an unsupportable program, though.

 */

void

i915_program_error(struct i915_fragment_program *p, const char *fmt, ...)

{

   if (unlikely((INTEL_DEBUG & (DEBUG_WM | DEBUG_PERF)) != 0)) {

      va_list args;

      fprintf(stderr, "i915_program_error: ");

      va_start(args, fmt);

      vfprintf(stderr, fmt, args);

      va_end(args);

      fprintf(stderr, "\n");

   }

   p->error = 1;

}

void

i915_init_program(struct i915_context *i915, struct i915_fragment_program *p)

{

   struct gl_context *ctx = &i915->intel.ctx;

   p->translated = 0;

   p->params_uptodate = 0;

   p->on_hardware = 0;

   p->error = 0;

   memset(&p->register_phases, 0, sizeof(p->register_phases));

   p->nr_tex_indirect = 1;

   p->nr_tex_insn = 0;

   p->nr_alu_insn = 0;

   p->nr_decl_insn = 0;

   p->ctx = ctx;

   memset(p->constant_flags, 0, sizeof(p->constant_flags));

   p->nr_constants = 0;

   p->csr = p->program;

   p->decl = p->declarations;

   p->decl_s = 0;

   p->decl_t = 0;

   p->temp_flag = 0xffff000;

   p->utemp_flag = ~0x7;

   p->wpos_tex = -1;

   p->depth_written = 0;

   p->nr_params = 0;

   *(p->decl++) = _3DSTATE_PIXEL_SHADER_PROGRAM;

}

void

i915_fini_program(struct i915_fragment_program *p)

{

   GLuint program_size = p->csr - p->program;

   GLuint decl_size = p->decl - p->declarations;

   if (p->nr_tex_indirect > I915_MAX_TEX_INDIRECT) {

      i915_program_error(p, "Exceeded max nr indirect texture lookups "

			 "(%d out of %d)",

			 p->nr_tex_indirect, I915_MAX_TEX_INDIRECT);

   }

   if (p->nr_tex_insn > I915_MAX_TEX_INSN) {

      i915_program_error(p, "Exceeded max TEX instructions (%d out of %d)",

			 p->nr_tex_insn, I915_MAX_TEX_INSN);

   }

   if (p->nr_alu_insn > I915_MAX_ALU_INSN)

      i915_program_error(p, "Exceeded max ALU instructions (%d out of %d)",

			 p->nr_alu_insn, I915_MAX_ALU_INSN);

   if (p->nr_decl_insn > I915_MAX_DECL_INSN) {

      i915_program_error(p, "Exceeded max DECL instructions (%d out of %d)",

			 p->nr_decl_insn, I915_MAX_DECL_INSN);

   }

   if (p->error) {

      p->FragProg.Base.NumNativeInstructions = 0;

      p->FragProg.Base.NumNativeAluInstructions = 0;

      p->FragProg.Base.NumNativeTexInstructions = 0;

      p->FragProg.Base.NumNativeTexIndirections = 0;

   }

   else {

      p->FragProg.Base.NumNativeInstructions = (p->nr_alu_insn +

                                                p->nr_tex_insn +

                                                p->nr_decl_insn);

      p->FragProg.Base.NumNativeAluInstructions = p->nr_alu_insn;

      p->FragProg.Base.NumNativeTexInstructions = p->nr_tex_insn;

      p->FragProg.Base.NumNativeTexIndirections = p->nr_tex_indirect;

   }

   p->declarations[0] |= program_size + decl_size - 2;

}

void

i915_upload_program(struct i915_context *i915,

                    struct i915_fragment_program *p)

{

   GLuint program_size = p->csr - p->program;

   GLuint decl_size = p->decl - p->declarations;

   if (p->error)

      return;

   /* Could just go straight to the batchbuffer from here:

    */

   if (i915->state.ProgramSize != (program_size + decl_size) ||

       memcmp(i915->state.Program + decl_size, p->program,

              program_size * sizeof(int)) != 0) {

      I915_STATECHANGE(i915, I915_UPLOAD_PROGRAM);

      memcpy(i915->state.Program, p->declarations, decl_size * sizeof(int));

      memcpy(i915->state.Program + decl_size, p->program,

             program_size * sizeof(int));

      i915->state.ProgramSize = decl_size + program_size;

   }

   /* Always seemed to get a failure if I used memcmp() to

    * shortcircuit this state upload.  Needs further investigation?

    */

   if (p->nr_constants) {

      GLuint nr = p->nr_constants;

      I915_ACTIVESTATE(i915, I915_UPLOAD_CONSTANTS, 1);

      I915_STATECHANGE(i915, I915_UPLOAD_CONSTANTS);

      i915->state.Constant[0] = _3DSTATE_PIXEL_SHADER_CONSTANTS | ((nr) * 4);

      i915->state.Constant[1] = (1 << (nr - 1)) | ((1 << (nr - 1)) - 1);

      memcpy(&i915->state.Constant[2], p->constant, 4 * sizeof(int) * (nr));

      i915->state.ConstantSize = 2 + (nr) * 4;

      if (0) {

         GLuint i;

         for (i = 0; i < nr; i++) {

            fprintf(stderr, "const[%d]: %f %f %f %f\n", i,

                    p->constant[i][0],

                    p->constant[i][1], p->constant[i][2], p->constant[i][3]);

         }

      }

   }

   else {

      I915_ACTIVESTATE(i915, I915_UPLOAD_CONSTANTS, 0);

   }

   p->on_hardware = 1;

}