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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 "main/transformfeedback.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_util.h"
  43. #include "brw_state.h"
  44. #include "brw_gs.h"
  45.  
  46. #include "glsl/ralloc.h"
  47.  
  48. static void compile_gs_prog( struct brw_context *brw,
  49.                              struct brw_gs_prog_key *key )
  50. {
  51.    struct brw_gs_compile c;
  52.    const GLuint *program;
  53.    void *mem_ctx;
  54.    GLuint program_size;
  55.  
  56.    memset(&c, 0, sizeof(c));
  57.  
  58.    c.key = *key;
  59.    c.vue_map = brw->vs.prog_data->base.vue_map;
  60.    c.nr_regs = (c.vue_map.num_slots + 1)/2;
  61.  
  62.    mem_ctx = ralloc_context(NULL);
  63.  
  64.    /* Begin the compilation:
  65.     */
  66.    brw_init_compile(brw, &c.func, mem_ctx);
  67.  
  68.    c.func.single_program_flow = 1;
  69.  
  70.    /* For some reason the thread is spawned with only 4 channels
  71.     * unmasked.
  72.     */
  73.    brw_set_mask_control(&c.func, BRW_MASK_DISABLE);
  74.  
  75.    if (brw->gen >= 6) {
  76.       unsigned num_verts;
  77.       bool check_edge_flag;
  78.       /* On Sandybridge, we use the GS for implementing transform feedback
  79.        * (called "Stream Out" in the PRM).
  80.        */
  81.       switch (key->primitive) {
  82.       case _3DPRIM_POINTLIST:
  83.          num_verts = 1;
  84.          check_edge_flag = false;
  85.          break;
  86.       case _3DPRIM_LINELIST:
  87.       case _3DPRIM_LINESTRIP:
  88.       case _3DPRIM_LINELOOP:
  89.          num_verts = 2;
  90.          check_edge_flag = false;
  91.          break;
  92.       case _3DPRIM_TRILIST:
  93.       case _3DPRIM_TRIFAN:
  94.       case _3DPRIM_TRISTRIP:
  95.       case _3DPRIM_RECTLIST:
  96.          num_verts = 3;
  97.          check_edge_flag = false;
  98.          break;
  99.       case _3DPRIM_QUADLIST:
  100.       case _3DPRIM_QUADSTRIP:
  101.       case _3DPRIM_POLYGON:
  102.          num_verts = 3;
  103.          check_edge_flag = true;
  104.          break;
  105.       default:
  106.          assert(!"Unexpected primitive type in Gen6 SOL program.");
  107.          return;
  108.       }
  109.       gen6_sol_program(&c, key, num_verts, check_edge_flag);
  110.    } else {
  111.       /* On Gen4-5, we use the GS to decompose certain types of primitives.
  112.        * Note that primitives which don't require a GS program have already
  113.        * been weeded out by now.
  114.        */
  115.       switch (key->primitive) {
  116.       case _3DPRIM_QUADLIST:
  117.          brw_gs_quads( &c, key );
  118.          break;
  119.       case _3DPRIM_QUADSTRIP:
  120.          brw_gs_quad_strip( &c, key );
  121.          break;
  122.       case _3DPRIM_LINELOOP:
  123.          brw_gs_lines( &c );
  124.          break;
  125.       default:
  126.          ralloc_free(mem_ctx);
  127.          return;
  128.       }
  129.    }
  130.  
  131.    /* get the program
  132.     */
  133.    program = brw_get_program(&c.func, &program_size);
  134.  
  135.    if (unlikely(INTEL_DEBUG & DEBUG_GS)) {
  136.       int i;
  137.  
  138.       printf("gs:\n");
  139.       for (i = 0; i < program_size / sizeof(struct brw_instruction); i++)
  140.          brw_disasm(stdout, &((struct brw_instruction *)program)[i],
  141.                     brw->gen);
  142.       printf("\n");
  143.     }
  144.  
  145.    brw_upload_cache(&brw->cache, BRW_GS_PROG,
  146.                     &c.key, sizeof(c.key),
  147.                     program, program_size,
  148.                     &c.prog_data, sizeof(c.prog_data),
  149.                     &brw->gs.prog_offset, &brw->gs.prog_data);
  150.    ralloc_free(mem_ctx);
  151. }
  152.  
  153. static void populate_key( struct brw_context *brw,
  154.                           struct brw_gs_prog_key *key )
  155. {
  156.    static const unsigned swizzle_for_offset[4] = {
  157.       BRW_SWIZZLE4(0, 1, 2, 3),
  158.       BRW_SWIZZLE4(1, 2, 3, 3),
  159.       BRW_SWIZZLE4(2, 3, 3, 3),
  160.       BRW_SWIZZLE4(3, 3, 3, 3)
  161.    };
  162.  
  163.    struct gl_context *ctx = &brw->ctx;
  164.  
  165.    memset(key, 0, sizeof(*key));
  166.  
  167.    /* CACHE_NEW_VS_PROG (part of VUE map) */
  168.    key->attrs = brw->vs.prog_data->base.vue_map.slots_valid;
  169.  
  170.    /* BRW_NEW_PRIMITIVE */
  171.    key->primitive = brw->primitive;
  172.  
  173.    /* _NEW_LIGHT */
  174.    key->pv_first = (ctx->Light.ProvokingVertex == GL_FIRST_VERTEX_CONVENTION);
  175.    if (key->primitive == _3DPRIM_QUADLIST && ctx->Light.ShadeModel != GL_FLAT) {
  176.       /* Provide consistent primitive order with brw_set_prim's
  177.        * optimization of single quads to trifans.
  178.        */
  179.       key->pv_first = true;
  180.    }
  181.  
  182.    if (brw->gen >= 7) {
  183.       /* On Gen7 and later, we don't use GS (yet). */
  184.       key->need_gs_prog = false;
  185.    } else if (brw->gen == 6) {
  186.       /* On Gen6, GS is used for transform feedback. */
  187.       /* BRW_NEW_TRANSFORM_FEEDBACK */
  188.       if (_mesa_is_xfb_active_and_unpaused(ctx)) {
  189.          const struct gl_shader_program *shaderprog =
  190.             ctx->Shader.CurrentVertexProgram;
  191.          const struct gl_transform_feedback_info *linked_xfb_info =
  192.             &shaderprog->LinkedTransformFeedback;
  193.          int i;
  194.  
  195.          /* Make sure that the VUE slots won't overflow the unsigned chars in
  196.           * key->transform_feedback_bindings[].
  197.           */
  198.          STATIC_ASSERT(BRW_VARYING_SLOT_COUNT <= 256);
  199.  
  200.          /* Make sure that we don't need more binding table entries than we've
  201.           * set aside for use in transform feedback.  (We shouldn't, since we
  202.           * set aside enough binding table entries to have one per component).
  203.           */
  204.          assert(linked_xfb_info->NumOutputs <= BRW_MAX_SOL_BINDINGS);
  205.  
  206.          key->need_gs_prog = true;
  207.          key->num_transform_feedback_bindings = linked_xfb_info->NumOutputs;
  208.          for (i = 0; i < key->num_transform_feedback_bindings; ++i) {
  209.             key->transform_feedback_bindings[i] =
  210.                linked_xfb_info->Outputs[i].OutputRegister;
  211.             key->transform_feedback_swizzles[i] =
  212.                swizzle_for_offset[linked_xfb_info->Outputs[i].ComponentOffset];
  213.          }
  214.       }
  215.    } else {
  216.       /* Pre-gen6, GS is used to transform QUADLIST, QUADSTRIP, and LINELOOP
  217.        * into simpler primitives.
  218.        */
  219.       key->need_gs_prog = (brw->primitive == _3DPRIM_QUADLIST ||
  220.                            brw->primitive == _3DPRIM_QUADSTRIP ||
  221.                            brw->primitive == _3DPRIM_LINELOOP);
  222.    }
  223. }
  224.  
  225. /* Calculate interpolants for triangle and line rasterization.
  226.  */
  227. static void
  228. brw_upload_gs_prog(struct brw_context *brw)
  229. {
  230.    struct brw_gs_prog_key key;
  231.    /* Populate the key:
  232.     */
  233.    populate_key(brw, &key);
  234.  
  235.    if (brw->gs.prog_active != key.need_gs_prog) {
  236.       brw->state.dirty.cache |= CACHE_NEW_GS_PROG;
  237.       brw->gs.prog_active = key.need_gs_prog;
  238.    }
  239.  
  240.    if (brw->gs.prog_active) {
  241.       if (!brw_search_cache(&brw->cache, BRW_GS_PROG,
  242.                             &key, sizeof(key),
  243.                             &brw->gs.prog_offset, &brw->gs.prog_data)) {
  244.          compile_gs_prog( brw, &key );
  245.       }
  246.    }
  247. }
  248.  
  249.  
  250. const struct brw_tracked_state brw_gs_prog = {
  251.    .dirty = {
  252.       .mesa  = (_NEW_LIGHT),
  253.       .brw   = (BRW_NEW_PRIMITIVE |
  254.                 BRW_NEW_TRANSFORM_FEEDBACK),
  255.       .cache = CACHE_NEW_VS_PROG
  256.    },
  257.    .emit = brw_upload_gs_prog
  258. };
  259.