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  1. /*
  2.  Copyright (C) Intel Corp.  2006.  All Rights Reserved.
  3.  Intel funded Tungsten Graphics (http://www.tungstengraphics.com) to
  4.  develop this 3D driver.
  5.  
  6.  Permission is hereby granted, free of charge, to any person obtaining
  7.  a 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, sublicense, 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
  16.  portions of the Software.
  17.  
  18.  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  19.  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20.  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
  21.  IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
  22.  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  23.  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  24.  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25.  
  26.  **********************************************************************/
  27.  /*
  28.   * Authors:
  29.   *   Keith Whitwell <keith@tungstengraphics.com>
  30.   */
  31.  
  32. #include "main/glheader.h"
  33. #include "main/macros.h"
  34. #include "main/enums.h"
  35. #include "program/program.h"
  36.  
  37. #include "intel_batchbuffer.h"
  38.  
  39. #include "brw_defines.h"
  40. #include "brw_context.h"
  41. #include "brw_eu.h"
  42. #include "brw_clip.h"
  43.  
  44. static void release_tmps( struct brw_clip_compile *c )
  45. {
  46.    c->last_tmp = c->first_tmp;
  47. }
  48.  
  49.  
  50. void brw_clip_tri_alloc_regs( struct brw_clip_compile *c,
  51.                               GLuint nr_verts )
  52. {
  53.    struct brw_context *brw = c->func.brw;
  54.    GLuint i = 0,j;
  55.  
  56.    /* Register usage is static, precompute here:
  57.     */
  58.    c->reg.R0 = retype(brw_vec8_grf(i, 0), BRW_REGISTER_TYPE_UD); i++;
  59.  
  60.    if (c->key.nr_userclip) {
  61.       c->reg.fixed_planes = brw_vec4_grf(i, 0);
  62.       i += (6 + c->key.nr_userclip + 1) / 2;
  63.  
  64.       c->prog_data.curb_read_length = (6 + c->key.nr_userclip + 1) / 2;
  65.    }
  66.    else
  67.       c->prog_data.curb_read_length = 0;
  68.  
  69.  
  70.    /* Payload vertices plus space for more generated vertices:
  71.     */
  72.    for (j = 0; j < nr_verts; j++) {
  73.       c->reg.vertex[j] = brw_vec4_grf(i, 0);
  74.       i += c->nr_regs;
  75.    }
  76.  
  77.    if (c->vue_map.num_slots % 2) {
  78.       /* The VUE has an odd number of slots so the last register is only half
  79.        * used.  Fill the second half with zero.
  80.        */
  81.       for (j = 0; j < 3; j++) {
  82.          GLuint delta = brw_vue_slot_to_offset(c->vue_map.num_slots);
  83.  
  84.          brw_MOV(&c->func, byte_offset(c->reg.vertex[j], delta), brw_imm_f(0));
  85.       }
  86.    }
  87.  
  88.    c->reg.t          = brw_vec1_grf(i, 0);
  89.    c->reg.loopcount  = retype(brw_vec1_grf(i, 1), BRW_REGISTER_TYPE_D);
  90.    c->reg.nr_verts   = retype(brw_vec1_grf(i, 2), BRW_REGISTER_TYPE_UD);
  91.    c->reg.planemask  = retype(brw_vec1_grf(i, 3), BRW_REGISTER_TYPE_UD);
  92.    c->reg.plane_equation = brw_vec4_grf(i, 4);
  93.    i++;
  94.  
  95.    c->reg.dpPrev     = brw_vec1_grf(i, 0); /* fixme - dp4 will clobber r.1,2,3 */
  96.    c->reg.dp         = brw_vec1_grf(i, 4);
  97.    i++;
  98.  
  99.    c->reg.inlist     = brw_uw16_reg(BRW_GENERAL_REGISTER_FILE, i, 0);
  100.    i++;
  101.  
  102.    c->reg.outlist    = brw_uw16_reg(BRW_GENERAL_REGISTER_FILE, i, 0);
  103.    i++;
  104.  
  105.    c->reg.freelist   = brw_uw16_reg(BRW_GENERAL_REGISTER_FILE, i, 0);
  106.    i++;
  107.  
  108.    if (!c->key.nr_userclip) {
  109.       c->reg.fixed_planes = brw_vec8_grf(i, 0);
  110.       i++;
  111.    }
  112.  
  113.    if (c->key.do_unfilled) {
  114.       c->reg.dir     = brw_vec4_grf(i, 0);
  115.       c->reg.offset  = brw_vec4_grf(i, 4);
  116.       i++;
  117.       c->reg.tmp0    = brw_vec4_grf(i, 0);
  118.       c->reg.tmp1    = brw_vec4_grf(i, 4);
  119.       i++;
  120.    }
  121.  
  122.    c->reg.vertex_src_mask = retype(brw_vec1_grf(i, 0), BRW_REGISTER_TYPE_UD);
  123.    i++;
  124.  
  125.    if (brw->gen == 5) {
  126.       c->reg.ff_sync = retype(brw_vec1_grf(i, 0), BRW_REGISTER_TYPE_UD);
  127.       i++;
  128.    }
  129.  
  130.    c->first_tmp = i;
  131.    c->last_tmp = i;
  132.  
  133.    c->prog_data.urb_read_length = c->nr_regs; /* ? */
  134.    c->prog_data.total_grf = i;
  135. }
  136.  
  137.  
  138.  
  139. void brw_clip_tri_init_vertices( struct brw_clip_compile *c )
  140. {
  141.    struct brw_compile *p = &c->func;
  142.    struct brw_reg tmp0 = c->reg.loopcount; /* handy temporary */
  143.  
  144.    /* Initial list of indices for incoming vertexes:
  145.     */
  146.    brw_AND(p, tmp0, get_element_ud(c->reg.R0, 2), brw_imm_ud(PRIM_MASK));
  147.    brw_CMP(p,
  148.            vec1(brw_null_reg()),
  149.            BRW_CONDITIONAL_EQ,
  150.            tmp0,
  151.            brw_imm_ud(_3DPRIM_TRISTRIP_REVERSE));
  152.  
  153.    /* XXX: Is there an easier way to do this?  Need to reverse every
  154.     * second tristrip element:  Can ignore sometimes?
  155.     */
  156.    brw_IF(p, BRW_EXECUTE_1);
  157.    {  
  158.       brw_MOV(p, get_element(c->reg.inlist, 0),  brw_address(c->reg.vertex[1]) );
  159.       brw_MOV(p, get_element(c->reg.inlist, 1),  brw_address(c->reg.vertex[0]) );
  160.       if (c->need_direction)
  161.          brw_MOV(p, c->reg.dir, brw_imm_f(-1));
  162.    }
  163.    brw_ELSE(p);
  164.    {
  165.       brw_MOV(p, get_element(c->reg.inlist, 0),  brw_address(c->reg.vertex[0]) );
  166.       brw_MOV(p, get_element(c->reg.inlist, 1),  brw_address(c->reg.vertex[1]) );
  167.       if (c->need_direction)
  168.          brw_MOV(p, c->reg.dir, brw_imm_f(1));
  169.    }
  170.    brw_ENDIF(p);
  171.  
  172.    brw_MOV(p, get_element(c->reg.inlist, 2),  brw_address(c->reg.vertex[2]) );
  173.    brw_MOV(p, brw_vec8_grf(c->reg.outlist.nr, 0), brw_imm_f(0));
  174.    brw_MOV(p, c->reg.nr_verts, brw_imm_ud(3));
  175. }
  176.  
  177.  
  178.  
  179. void brw_clip_tri_flat_shade( struct brw_clip_compile *c )
  180. {
  181.    struct brw_compile *p = &c->func;
  182.    struct brw_reg tmp0 = c->reg.loopcount; /* handy temporary */
  183.  
  184.    brw_AND(p, tmp0, get_element_ud(c->reg.R0, 2), brw_imm_ud(PRIM_MASK));
  185.    brw_CMP(p,
  186.            vec1(brw_null_reg()),
  187.            BRW_CONDITIONAL_EQ,
  188.            tmp0,
  189.            brw_imm_ud(_3DPRIM_POLYGON));
  190.  
  191.    brw_IF(p, BRW_EXECUTE_1);
  192.    {
  193.       brw_clip_copy_colors(c, 1, 0);
  194.       brw_clip_copy_colors(c, 2, 0);
  195.    }
  196.    brw_ELSE(p);
  197.    {
  198.       if (c->key.pv_first) {
  199.          brw_CMP(p,
  200.                  vec1(brw_null_reg()),
  201.                  BRW_CONDITIONAL_EQ,
  202.                  tmp0,
  203.                  brw_imm_ud(_3DPRIM_TRIFAN));
  204.          brw_IF(p, BRW_EXECUTE_1);
  205.          {
  206.             brw_clip_copy_colors(c, 0, 1);
  207.             brw_clip_copy_colors(c, 2, 1);
  208.          }
  209.          brw_ELSE(p);
  210.          {
  211.             brw_clip_copy_colors(c, 1, 0);
  212.             brw_clip_copy_colors(c, 2, 0);
  213.          }
  214.          brw_ENDIF(p);
  215.       }
  216.       else {
  217.          brw_clip_copy_colors(c, 0, 2);
  218.          brw_clip_copy_colors(c, 1, 2);
  219.       }
  220.    }
  221.    brw_ENDIF(p);
  222. }
  223.  
  224.  
  225. static inline void
  226. load_vertex_pos(struct brw_clip_compile *c, struct brw_indirect vtx,
  227.                 struct brw_reg dst,
  228.                 GLuint hpos_offset, GLuint clip_offset)
  229. {
  230.    struct brw_compile *p = &c->func;
  231.  
  232.    /*
  233.     * Roughly:
  234.     * dst = (vertex_src_mask & 1) ? src.hpos : src.clipvertex;
  235.     */
  236.  
  237.    brw_set_conditionalmod(p, BRW_CONDITIONAL_NZ);
  238.    brw_AND(p, vec1(brw_null_reg()), c->reg.vertex_src_mask, brw_imm_ud(1));
  239.    brw_IF(p, BRW_EXECUTE_1);
  240.    {
  241.       brw_MOV(p, dst, deref_4f(vtx, clip_offset));
  242.    }
  243.    brw_ELSE(p);
  244.    {
  245.       brw_MOV(p, dst, deref_4f(vtx, hpos_offset));
  246.    }
  247.    brw_ENDIF(p);
  248. }
  249.  
  250.  
  251. /* Use mesa's clipping algorithms, translated to GEN4 assembly.
  252.  */
  253. void brw_clip_tri( struct brw_clip_compile *c )
  254. {
  255.    struct brw_compile *p = &c->func;
  256.    struct brw_indirect vtx = brw_indirect(0, 0);
  257.    struct brw_indirect vtxPrev = brw_indirect(1, 0);
  258.    struct brw_indirect vtxOut = brw_indirect(2, 0);
  259.    struct brw_indirect plane_ptr = brw_indirect(3, 0);
  260.    struct brw_indirect inlist_ptr = brw_indirect(4, 0);
  261.    struct brw_indirect outlist_ptr = brw_indirect(5, 0);
  262.    struct brw_indirect freelist_ptr = brw_indirect(6, 0);
  263.    GLuint hpos_offset = brw_varying_to_offset(&c->vue_map, VARYING_SLOT_POS);
  264.    GLuint clipvert_offset = brw_clip_have_varying(c, VARYING_SLOT_CLIP_VERTEX)
  265.       ? brw_varying_to_offset(&c->vue_map, VARYING_SLOT_CLIP_VERTEX)
  266.       : hpos_offset;
  267.  
  268.    brw_MOV(p, get_addr_reg(vtxPrev),     brw_address(c->reg.vertex[2]) );
  269.    brw_MOV(p, get_addr_reg(plane_ptr),   brw_clip_plane0_address(c));
  270.    brw_MOV(p, get_addr_reg(inlist_ptr),  brw_address(c->reg.inlist));
  271.    brw_MOV(p, get_addr_reg(outlist_ptr), brw_address(c->reg.outlist));
  272.  
  273.    brw_MOV(p, get_addr_reg(freelist_ptr), brw_address(c->reg.vertex[3]) );
  274.  
  275.    /* Set the initial vertex source mask: The first 6 planes are the bounds
  276.     * of the view volume; the next 6 planes are the user clipping planes.
  277.     */
  278.    brw_MOV(p, c->reg.vertex_src_mask, brw_imm_ud(0xfc0));
  279.  
  280.    brw_DO(p, BRW_EXECUTE_1);
  281.    {
  282.       /* if (planemask & 1)
  283.        */
  284.       brw_set_conditionalmod(p, BRW_CONDITIONAL_NZ);
  285.       brw_AND(p, vec1(brw_null_reg()), c->reg.planemask, brw_imm_ud(1));
  286.      
  287.       brw_IF(p, BRW_EXECUTE_1);
  288.       {
  289.          /* vtxOut = freelist_ptr++
  290.           */
  291.          brw_MOV(p, get_addr_reg(vtxOut),       get_addr_reg(freelist_ptr) );
  292.          brw_ADD(p, get_addr_reg(freelist_ptr), get_addr_reg(freelist_ptr), brw_imm_uw(c->nr_regs * REG_SIZE));
  293.  
  294.          if (c->key.nr_userclip)
  295.             brw_MOV(p, c->reg.plane_equation, deref_4f(plane_ptr, 0));
  296.          else
  297.             brw_MOV(p, c->reg.plane_equation, deref_4b(plane_ptr, 0));
  298.            
  299.          brw_MOV(p, c->reg.loopcount, c->reg.nr_verts);
  300.          brw_MOV(p, c->reg.nr_verts, brw_imm_ud(0));
  301.  
  302.          brw_DO(p, BRW_EXECUTE_1);
  303.          {
  304.             /* vtx = *input_ptr;
  305.              */
  306.             brw_MOV(p, get_addr_reg(vtx), deref_1uw(inlist_ptr, 0));
  307.  
  308.             load_vertex_pos(c, vtxPrev, vec4(c->reg.dpPrev), hpos_offset, clipvert_offset);
  309.             /* IS_NEGATIVE(prev) */
  310.             brw_set_conditionalmod(p, BRW_CONDITIONAL_L);
  311.             brw_DP4(p, vec4(c->reg.dpPrev), vec4(c->reg.dpPrev), c->reg.plane_equation);
  312.             brw_IF(p, BRW_EXECUTE_1);
  313.             {
  314.                load_vertex_pos(c, vtx, vec4(c->reg.dp), hpos_offset, clipvert_offset);
  315.                /* IS_POSITIVE(next)
  316.                 */
  317.                brw_set_conditionalmod(p, BRW_CONDITIONAL_GE);
  318.                brw_DP4(p, vec4(c->reg.dp), vec4(c->reg.dp), c->reg.plane_equation);
  319.                brw_IF(p, BRW_EXECUTE_1);
  320.                {
  321.  
  322.                   /* Coming back in.
  323.                    */
  324.                   brw_ADD(p, c->reg.t, c->reg.dpPrev, negate(c->reg.dp));
  325.                   brw_math_invert(p, c->reg.t, c->reg.t);
  326.                   brw_MUL(p, c->reg.t, c->reg.t, c->reg.dpPrev);
  327.  
  328.                   /* If (vtxOut == 0) vtxOut = vtxPrev
  329.                    */
  330.                   brw_CMP(p, vec1(brw_null_reg()), BRW_CONDITIONAL_EQ, get_addr_reg(vtxOut), brw_imm_uw(0) );
  331.                   brw_MOV(p, get_addr_reg(vtxOut), get_addr_reg(vtxPrev) );
  332.                   brw_set_predicate_control(p, BRW_PREDICATE_NONE);
  333.  
  334.                   brw_clip_interp_vertex(c, vtxOut, vtxPrev, vtx, c->reg.t, false);
  335.  
  336.                   /* *outlist_ptr++ = vtxOut;
  337.                    * nr_verts++;
  338.                    * vtxOut = 0;
  339.                    */
  340.                   brw_MOV(p, deref_1uw(outlist_ptr, 0), get_addr_reg(vtxOut));
  341.                   brw_ADD(p, get_addr_reg(outlist_ptr), get_addr_reg(outlist_ptr), brw_imm_uw(sizeof(short)));
  342.                   brw_ADD(p, c->reg.nr_verts, c->reg.nr_verts, brw_imm_ud(1));
  343.                   brw_MOV(p, get_addr_reg(vtxOut), brw_imm_uw(0) );
  344.                }
  345.                brw_ENDIF(p);
  346.                
  347.             }
  348.             brw_ELSE(p);
  349.             {
  350.                /* *outlist_ptr++ = vtxPrev;
  351.                 * nr_verts++;
  352.                 */
  353.                brw_MOV(p, deref_1uw(outlist_ptr, 0), get_addr_reg(vtxPrev));
  354.                brw_ADD(p, get_addr_reg(outlist_ptr), get_addr_reg(outlist_ptr), brw_imm_uw(sizeof(short)));
  355.                brw_ADD(p, c->reg.nr_verts, c->reg.nr_verts, brw_imm_ud(1));
  356.  
  357.                load_vertex_pos(c, vtx, vec4(c->reg.dp), hpos_offset, clipvert_offset);
  358.                /* IS_NEGATIVE(next)
  359.                 */
  360.                brw_set_conditionalmod(p, BRW_CONDITIONAL_L);
  361.                brw_DP4(p, vec4(c->reg.dp), vec4(c->reg.dp), c->reg.plane_equation);
  362.                brw_IF(p, BRW_EXECUTE_1);
  363.                {
  364.                   /* Going out of bounds.  Avoid division by zero as we
  365.                    * know dp != dpPrev from DIFFERENT_SIGNS, above.
  366.                    */
  367.                   brw_ADD(p, c->reg.t, c->reg.dp, negate(c->reg.dpPrev));
  368.                   brw_math_invert(p, c->reg.t, c->reg.t);
  369.                   brw_MUL(p, c->reg.t, c->reg.t, c->reg.dp);
  370.  
  371.                   /* If (vtxOut == 0) vtxOut = vtx
  372.                    */
  373.                   brw_CMP(p, vec1(brw_null_reg()), BRW_CONDITIONAL_EQ, get_addr_reg(vtxOut), brw_imm_uw(0) );
  374.                   brw_MOV(p, get_addr_reg(vtxOut), get_addr_reg(vtx) );
  375.                   brw_set_predicate_control(p, BRW_PREDICATE_NONE);
  376.  
  377.                   brw_clip_interp_vertex(c, vtxOut, vtx, vtxPrev, c->reg.t, true);
  378.  
  379.                   /* *outlist_ptr++ = vtxOut;
  380.                    * nr_verts++;
  381.                    * vtxOut = 0;
  382.                    */
  383.                   brw_MOV(p, deref_1uw(outlist_ptr, 0), get_addr_reg(vtxOut));
  384.                   brw_ADD(p, get_addr_reg(outlist_ptr), get_addr_reg(outlist_ptr), brw_imm_uw(sizeof(short)));
  385.                   brw_ADD(p, c->reg.nr_verts, c->reg.nr_verts, brw_imm_ud(1));
  386.                   brw_MOV(p, get_addr_reg(vtxOut), brw_imm_uw(0) );
  387.                }              
  388.                brw_ENDIF(p);
  389.             }
  390.             brw_ENDIF(p);
  391.            
  392.             /* vtxPrev = vtx;
  393.              * inlist_ptr++;
  394.              */
  395.             brw_MOV(p, get_addr_reg(vtxPrev), get_addr_reg(vtx));
  396.             brw_ADD(p, get_addr_reg(inlist_ptr), get_addr_reg(inlist_ptr), brw_imm_uw(sizeof(short)));
  397.  
  398.             /* while (--loopcount != 0)
  399.              */
  400.             brw_set_conditionalmod(p, BRW_CONDITIONAL_NZ);
  401.             brw_ADD(p, c->reg.loopcount, c->reg.loopcount, brw_imm_d(-1));
  402.          }
  403.          brw_WHILE(p);
  404.  
  405.          /* vtxPrev = *(outlist_ptr-1)  OR: outlist[nr_verts-1]
  406.           * inlist = outlist
  407.           * inlist_ptr = &inlist[0]
  408.           * outlist_ptr = &outlist[0]
  409.           */
  410.          brw_ADD(p, get_addr_reg(outlist_ptr), get_addr_reg(outlist_ptr), brw_imm_w(-2));
  411.          brw_MOV(p, get_addr_reg(vtxPrev), deref_1uw(outlist_ptr, 0));
  412.          brw_MOV(p, brw_vec8_grf(c->reg.inlist.nr, 0), brw_vec8_grf(c->reg.outlist.nr, 0));
  413.          brw_MOV(p, get_addr_reg(inlist_ptr), brw_address(c->reg.inlist));
  414.          brw_MOV(p, get_addr_reg(outlist_ptr), brw_address(c->reg.outlist));
  415.       }
  416.       brw_ENDIF(p);
  417.      
  418.       /* plane_ptr++;
  419.        */
  420.       brw_ADD(p, get_addr_reg(plane_ptr), get_addr_reg(plane_ptr), brw_clip_plane_stride(c));
  421.  
  422.       /* nr_verts >= 3
  423.        */
  424.       brw_CMP(p,
  425.               vec1(brw_null_reg()),
  426.               BRW_CONDITIONAL_GE,
  427.               c->reg.nr_verts,
  428.               brw_imm_ud(3));
  429.    
  430.       /* && (planemask>>=1) != 0
  431.        */
  432.       brw_set_conditionalmod(p, BRW_CONDITIONAL_NZ);
  433.       brw_SHR(p, c->reg.planemask, c->reg.planemask, brw_imm_ud(1));
  434.       brw_SHR(p, c->reg.vertex_src_mask, c->reg.vertex_src_mask, brw_imm_ud(1));
  435.    }
  436.    brw_WHILE(p);
  437. }
  438.  
  439.  
  440.  
  441. void brw_clip_tri_emit_polygon(struct brw_clip_compile *c)
  442. {
  443.    struct brw_compile *p = &c->func;
  444.  
  445.    /* for (loopcount = nr_verts-2; loopcount > 0; loopcount--)
  446.     */
  447.    brw_set_conditionalmod(p, BRW_CONDITIONAL_G);
  448.    brw_ADD(p,
  449.            c->reg.loopcount,
  450.            c->reg.nr_verts,
  451.            brw_imm_d(-2));
  452.  
  453.    brw_IF(p, BRW_EXECUTE_1);
  454.    {
  455.       struct brw_indirect v0 = brw_indirect(0, 0);
  456.       struct brw_indirect vptr = brw_indirect(1, 0);
  457.  
  458.       brw_MOV(p, get_addr_reg(vptr), brw_address(c->reg.inlist));
  459.       brw_MOV(p, get_addr_reg(v0), deref_1uw(vptr, 0));
  460.  
  461.       brw_clip_emit_vue(c, v0, 1, 0,
  462.                         ((_3DPRIM_TRIFAN << URB_WRITE_PRIM_TYPE_SHIFT)
  463.                          | URB_WRITE_PRIM_START));
  464.      
  465.       brw_ADD(p, get_addr_reg(vptr), get_addr_reg(vptr), brw_imm_uw(2));
  466.       brw_MOV(p, get_addr_reg(v0), deref_1uw(vptr, 0));
  467.  
  468.       brw_DO(p, BRW_EXECUTE_1);
  469.       {
  470.          brw_clip_emit_vue(c, v0, 1, 0,
  471.                            (_3DPRIM_TRIFAN << URB_WRITE_PRIM_TYPE_SHIFT));
  472.  
  473.          brw_ADD(p, get_addr_reg(vptr), get_addr_reg(vptr), brw_imm_uw(2));
  474.          brw_MOV(p, get_addr_reg(v0), deref_1uw(vptr, 0));
  475.  
  476.          brw_set_conditionalmod(p, BRW_CONDITIONAL_NZ);
  477.          brw_ADD(p, c->reg.loopcount, c->reg.loopcount, brw_imm_d(-1));
  478.       }
  479.       brw_WHILE(p);
  480.  
  481.       brw_clip_emit_vue(c, v0, 0, 1,
  482.                         ((_3DPRIM_TRIFAN << URB_WRITE_PRIM_TYPE_SHIFT)
  483.                          | URB_WRITE_PRIM_END));
  484.    }
  485.    brw_ENDIF(p);
  486. }
  487.  
  488. static void do_clip_tri( struct brw_clip_compile *c )
  489. {
  490.    brw_clip_init_planes(c);
  491.  
  492.    brw_clip_tri(c);
  493. }
  494.  
  495.  
  496. static void maybe_do_clip_tri( struct brw_clip_compile *c )
  497. {
  498.    struct brw_compile *p = &c->func;
  499.  
  500.    brw_CMP(p, vec1(brw_null_reg()), BRW_CONDITIONAL_NZ, c->reg.planemask, brw_imm_ud(0));
  501.    brw_IF(p, BRW_EXECUTE_1);
  502.    {
  503.       do_clip_tri(c);
  504.    }
  505.    brw_ENDIF(p);
  506. }
  507.  
  508. static void brw_clip_test( struct brw_clip_compile *c )
  509. {
  510.     struct brw_reg t = retype(get_tmp(c), BRW_REGISTER_TYPE_UD);
  511.     struct brw_reg t1 = retype(get_tmp(c), BRW_REGISTER_TYPE_UD);
  512.     struct brw_reg t2 = retype(get_tmp(c), BRW_REGISTER_TYPE_UD);
  513.     struct brw_reg t3 = retype(get_tmp(c), BRW_REGISTER_TYPE_UD);
  514.  
  515.     struct brw_reg v0 = get_tmp(c);
  516.     struct brw_reg v1 = get_tmp(c);
  517.     struct brw_reg v2 = get_tmp(c);
  518.  
  519.     struct brw_indirect vt0 = brw_indirect(0, 0);
  520.     struct brw_indirect vt1 = brw_indirect(1, 0);
  521.     struct brw_indirect vt2 = brw_indirect(2, 0);
  522.  
  523.     struct brw_compile *p = &c->func;
  524.     struct brw_reg tmp0 = c->reg.loopcount; /* handy temporary */
  525.  
  526.     GLuint hpos_offset = brw_varying_to_offset(&c->vue_map,
  527.                                                    VARYING_SLOT_POS);
  528.  
  529.     brw_MOV(p, get_addr_reg(vt0), brw_address(c->reg.vertex[0]));
  530.     brw_MOV(p, get_addr_reg(vt1), brw_address(c->reg.vertex[1]));
  531.     brw_MOV(p, get_addr_reg(vt2), brw_address(c->reg.vertex[2]));
  532.     brw_MOV(p, v0, deref_4f(vt0, hpos_offset));
  533.     brw_MOV(p, v1, deref_4f(vt1, hpos_offset));
  534.     brw_MOV(p, v2, deref_4f(vt2, hpos_offset));
  535.     brw_AND(p, c->reg.planemask, c->reg.planemask, brw_imm_ud(~0x3f));
  536.  
  537.     /* test nearz, xmin, ymin plane */
  538.     /* clip.xyz < -clip.w */
  539.     brw_CMP(p, t1, BRW_CONDITIONAL_L, v0, negate(get_element(v0, 3)));
  540.     brw_set_predicate_control(p, BRW_PREDICATE_NONE);
  541.     brw_CMP(p, t2, BRW_CONDITIONAL_L, v1, negate(get_element(v1, 3)));
  542.     brw_set_predicate_control(p, BRW_PREDICATE_NONE);
  543.     brw_CMP(p, t3, BRW_CONDITIONAL_L, v2, negate(get_element(v2, 3)));
  544.     brw_set_predicate_control(p, BRW_PREDICATE_NONE);
  545.  
  546.     /* All vertices are outside of a plane, rejected */
  547.     brw_AND(p, t, t1, t2);
  548.     brw_AND(p, t, t, t3);
  549.     brw_OR(p, tmp0, get_element(t, 0), get_element(t, 1));
  550.     brw_OR(p, tmp0, tmp0, get_element(t, 2));
  551.     brw_set_conditionalmod(p, BRW_CONDITIONAL_NZ);
  552.     brw_AND(p, brw_null_reg(), tmp0, brw_imm_ud(0x1));
  553.     brw_IF(p, BRW_EXECUTE_1);
  554.     {
  555.         brw_clip_kill_thread(c);
  556.     }
  557.     brw_ENDIF(p);
  558.     brw_set_predicate_control(p, BRW_PREDICATE_NONE);
  559.  
  560.     /* some vertices are inside a plane, some are outside,need to clip */
  561.     brw_XOR(p, t, t1, t2);
  562.     brw_XOR(p, t1, t2, t3);
  563.     brw_OR(p, t, t, t1);
  564.     brw_AND(p, t, t, brw_imm_ud(0x1));
  565.     brw_CMP(p, brw_null_reg(), BRW_CONDITIONAL_NZ,
  566.             get_element(t, 0), brw_imm_ud(0));
  567.     brw_OR(p, c->reg.planemask, c->reg.planemask, brw_imm_ud((1<<5)));
  568.     brw_set_predicate_control(p, BRW_PREDICATE_NONE);
  569.     brw_CMP(p, brw_null_reg(), BRW_CONDITIONAL_NZ,
  570.             get_element(t, 1), brw_imm_ud(0));
  571.     brw_OR(p, c->reg.planemask, c->reg.planemask, brw_imm_ud((1<<3)));
  572.     brw_set_predicate_control(p, BRW_PREDICATE_NONE);
  573.     brw_CMP(p, brw_null_reg(), BRW_CONDITIONAL_NZ,
  574.             get_element(t, 2), brw_imm_ud(0));
  575.     brw_OR(p, c->reg.planemask, c->reg.planemask, brw_imm_ud((1<<1)));
  576.     brw_set_predicate_control(p, BRW_PREDICATE_NONE);
  577.  
  578.     /* test farz, xmax, ymax plane */
  579.     /* clip.xyz > clip.w */
  580.     brw_CMP(p, t1, BRW_CONDITIONAL_G, v0, get_element(v0, 3));
  581.     brw_set_predicate_control(p, BRW_PREDICATE_NONE);
  582.     brw_CMP(p, t2, BRW_CONDITIONAL_G, v1, get_element(v1, 3));
  583.     brw_set_predicate_control(p, BRW_PREDICATE_NONE);
  584.     brw_CMP(p, t3, BRW_CONDITIONAL_G, v2, get_element(v2, 3));
  585.     brw_set_predicate_control(p, BRW_PREDICATE_NONE);
  586.  
  587.     /* All vertices are outside of a plane, rejected */
  588.     brw_AND(p, t, t1, t2);
  589.     brw_AND(p, t, t, t3);
  590.     brw_OR(p, tmp0, get_element(t, 0), get_element(t, 1));
  591.     brw_OR(p, tmp0, tmp0, get_element(t, 2));
  592.     brw_set_conditionalmod(p, BRW_CONDITIONAL_NZ);
  593.     brw_AND(p, brw_null_reg(), tmp0, brw_imm_ud(0x1));
  594.     brw_IF(p, BRW_EXECUTE_1);
  595.     {
  596.         brw_clip_kill_thread(c);
  597.     }
  598.     brw_ENDIF(p);
  599.     brw_set_predicate_control(p, BRW_PREDICATE_NONE);
  600.  
  601.     /* some vertices are inside a plane, some are outside,need to clip */
  602.     brw_XOR(p, t, t1, t2);
  603.     brw_XOR(p, t1, t2, t3);
  604.     brw_OR(p, t, t, t1);
  605.     brw_AND(p, t, t, brw_imm_ud(0x1));
  606.     brw_CMP(p, brw_null_reg(), BRW_CONDITIONAL_NZ,
  607.             get_element(t, 0), brw_imm_ud(0));
  608.     brw_OR(p, c->reg.planemask, c->reg.planemask, brw_imm_ud((1<<4)));
  609.     brw_set_predicate_control(p, BRW_PREDICATE_NONE);
  610.     brw_CMP(p, brw_null_reg(), BRW_CONDITIONAL_NZ,
  611.             get_element(t, 1), brw_imm_ud(0));
  612.     brw_OR(p, c->reg.planemask, c->reg.planemask, brw_imm_ud((1<<2)));
  613.     brw_set_predicate_control(p, BRW_PREDICATE_NONE);
  614.     brw_CMP(p, brw_null_reg(), BRW_CONDITIONAL_NZ,
  615.             get_element(t, 2), brw_imm_ud(0));
  616.     brw_OR(p, c->reg.planemask, c->reg.planemask, brw_imm_ud((1<<0)));
  617.     brw_set_predicate_control(p, BRW_PREDICATE_NONE);
  618.  
  619.     release_tmps(c);
  620. }
  621.  
  622.  
  623. void brw_emit_tri_clip( struct brw_clip_compile *c )
  624. {
  625.    struct brw_compile *p = &c->func;
  626.    struct brw_context *brw = p->brw;
  627.    brw_clip_tri_alloc_regs(c, 3 + c->key.nr_userclip + 6);
  628.    brw_clip_tri_init_vertices(c);
  629.    brw_clip_init_clipmask(c);
  630.    brw_clip_init_ff_sync(c);
  631.  
  632.    /* if -ve rhw workaround bit is set,
  633.       do cliptest */
  634.    if (brw->has_negative_rhw_bug) {
  635.       brw_set_conditionalmod(p, BRW_CONDITIONAL_NZ);
  636.       brw_AND(p, brw_null_reg(), get_element_ud(c->reg.R0, 2),
  637.               brw_imm_ud(1<<20));
  638.       brw_IF(p, BRW_EXECUTE_1);
  639.       {
  640.          brw_clip_test(c);
  641.       }
  642.       brw_ENDIF(p);
  643.    }
  644.    /* Can't push into do_clip_tri because with polygon (or quad)
  645.     * flatshading, need to apply the flatshade here because we don't
  646.     * respect the PV when converting to trifan for emit:
  647.     */
  648.    if (c->key.do_flat_shading)
  649.       brw_clip_tri_flat_shade(c);
  650.      
  651.    if ((c->key.clip_mode == BRW_CLIPMODE_NORMAL) ||
  652.        (c->key.clip_mode == BRW_CLIPMODE_KERNEL_CLIP))
  653.       do_clip_tri(c);
  654.    else
  655.       maybe_do_clip_tri(c);
  656.  
  657.    brw_clip_tri_emit_polygon(c);
  658.  
  659.    /* Send an empty message to kill the thread:
  660.     */
  661.    brw_clip_kill_thread(c);
  662. }
  663.