src/mesa/drivers/dri/i965/brw_gs.c

   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
  36 #include "intel_batchbuffer.h"
  37
  38 #include "brw_defines.h"
  39 #include "brw_context.h"
  40 #include "brw_eu.h"
  41 #include "brw_util.h"
  42 #include "brw_state.h"
  43 #include "brw_gs.h"
  44
  45 #include "glsl/ralloc.h"
  46
  47 static void compile_gs_prog( struct brw_context *brw,
  48                              struct brw_gs_prog_key *key )
  49 {
  50    struct intel_context *intel = &brw->intel;
  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    /* The geometry shader needs to access the entire VUE. */
  60    brw_compute_vue_map(&c.vue_map, intel, c.key.userclip_active, c.key.attrs);
  61    c.nr_regs = (c.vue_map.num_slots + 1)/2;
  62
  63    mem_ctx = NULL;
  64
  65    /* Begin the compilation:
  66     */
  67    brw_init_compile(brw, &c.func, mem_ctx);
  68
  69    c.func.single_program_flow = 1;
  70
  71    /* For some reason the thread is spawned with only 4 channels
  72     * unmasked.
  73     */
  74    brw_set_mask_control(&c.func, BRW_MASK_DISABLE);
  75
  76    if (intel->gen >= 6) {
  77       unsigned num_verts;
  78       bool check_edge_flag;
  79       /* On Sandybridge, we use the GS for implementing transform feedback
  80        * (called "Stream Out" in the PRM).
  81        */
  82       switch (key->primitive) {
  83       case _3DPRIM_POINTLIST:
  84          num_verts = 1;
  85          check_edge_flag = false;
  86          break;
  87       case _3DPRIM_LINELIST:
  88       case _3DPRIM_LINESTRIP:
  89       case _3DPRIM_LINELOOP:
  90          num_verts = 2;
  91          check_edge_flag = false;
  92          break;
  93       case _3DPRIM_TRILIST:
  94       case _3DPRIM_TRIFAN:
  95       case _3DPRIM_TRISTRIP:
  96       case _3DPRIM_RECTLIST:
  97          num_verts = 3;
  98          check_edge_flag = false;
  99          break;
 100       case _3DPRIM_QUADLIST:
 101       case _3DPRIM_QUADSTRIP:
 102       case _3DPRIM_POLYGON:
 103          num_verts = 3;
 104          check_edge_flag = true;
 105          break;
 106       default:
 107          assert(!"Unexpected primitive type in Gen6 SOL program.");
 108          return;
 109       }
 110       gen6_sol_program(&c, key, num_verts, check_edge_flag);
 111    } else {
 112       /* On Gen4-5, we use the GS to decompose certain types of primitives.
 113        * Note that primitives which don't require a GS program have already
 114        * been weeded out by now.
 115        */
 116       switch (key->primitive) {
 117       case _3DPRIM_QUADLIST:
 118          brw_gs_quads( &c, key );
 119          break;
 120       case _3DPRIM_QUADSTRIP:
 121          brw_gs_quad_strip( &c, key );
 122          break;
 123       case _3DPRIM_LINELOOP:
 124          brw_gs_lines( &c );
 125          break;
 126       default:
 127          ralloc_free(mem_ctx);
 128          return;
 129       }
 130    }
 131
 132    /* get the program
 133     */
 134    program = brw_get_program(&c.func, &program_size);
 135
 136    if (unlikely(INTEL_DEBUG & DEBUG_GS)) {
 137       int i;
 138
 139       printf("gs:\n");
 140       for (i = 0; i < program_size / sizeof(struct brw_instruction); i++)
 141          brw_disasm(stdout, &((struct brw_instruction *)program)[i],
 142                     intel->gen);
 143       printf("\n");
 144     }
 145
 146    brw_upload_cache(&brw->cache, BRW_GS_PROG,
 147                     &c.key, sizeof(c.key),
 148                     program, program_size,
 149                     &c.prog_data, sizeof(c.prog_data),
 150                     &brw->gs.prog_offset, &brw->gs.prog_data);
 151    ralloc_free(mem_ctx);
 152 }
 153
 154 static void populate_key( struct brw_context *brw,
 155                           struct brw_gs_prog_key *key )
 156 {
 157    struct gl_context *ctx = &brw->intel.ctx;
 158    struct intel_context *intel = &brw->intel;
 159
 160    memset(key, 0, sizeof(*key));
 161
 162    /* CACHE_NEW_VS_PROG */
 163    key->attrs = brw->vs.prog_data->outputs_written;
 164
 165    /* BRW_NEW_PRIMITIVE */
 166    key->primitive = brw->primitive;
 167
 168    /* _NEW_LIGHT */
 169    key->pv_first = (ctx->Light.ProvokingVertex == GL_FIRST_VERTEX_CONVENTION);
 170    if (key->primitive == _3DPRIM_QUADLIST && ctx->Light.ShadeModel != GL_FLAT) {
 171       /* Provide consistent primitive order with brw_set_prim's
 172        * optimization of single quads to trifans.
 173        */
 174       key->pv_first = true;
 175    }
 176
 177    /* _NEW_TRANSFORM */
 178    key->userclip_active = (ctx->Transform.ClipPlanesEnabled != 0);
 179
 180    if (intel->gen >= 7) {
 181       /* On Gen7 and later, we don't use GS (yet). */
 182       key->need_gs_prog = false;
 183    } else if (intel->gen == 6) {
 184       /* On Gen6, GS is used for transform feedback. */
 185       /* _NEW_TRANSFORM_FEEDBACK */
 186       if (ctx->TransformFeedback.CurrentObject->Active) {
 187          const struct gl_shader_program *shaderprog =
 188             ctx->Shader.CurrentVertexProgram;
 189          const struct gl_transform_feedback_info *linked_xfb_info =
 190             &shaderprog->LinkedTransformFeedback;
 191          int i;
 192
 193          /* Make sure that the VUE slots won't overflow the unsigned chars in
 194           * key->transform_feedback_bindings[].
 195           */
 196          STATIC_ASSERT(BRW_VERT_RESULT_MAX <= 256);
 197
 198          /* Make sure that we don't need more binding table entries than we've
 199           * set aside for use in transform feedback.  (We shouldn't, since we
 200           * set aside enough binding table entries to have one per component).
 201           */
 202          assert(linked_xfb_info->NumOutputs <= BRW_MAX_SOL_BINDINGS);
 203
 204          key->need_gs_prog = true;
 205          key->num_transform_feedback_bindings = linked_xfb_info->NumOutputs;
 206          for (i = 0; i < key->num_transform_feedback_bindings; ++i) {
 207             key->transform_feedback_bindings[i] =
 208                linked_xfb_info->Outputs[i].OutputRegister;
 209          }
 210       }
 211       /* On Gen6, GS is also used for rasterizer discard. */
 212       /* _NEW_TRANSFORM_FEEDBACK */
 213       if (ctx->RasterDiscard) {
 214          key->need_gs_prog = true;
 215          key->rasterizer_discard = true;
 216       }
 217    } else {
 218       /* Pre-gen6, GS is used to transform QUADLIST, QUADSTRIP, and LINELOOP
 219        * into simpler primitives.
 220        */
 221       key->need_gs_prog = (brw->primitive == _3DPRIM_QUADLIST ||
 222                            brw->primitive == _3DPRIM_QUADSTRIP ||
 223                            brw->primitive == _3DPRIM_LINELOOP);
 224    }
 225    /* For testing, the environment variable INTEL_FORCE_GS can be used to
 226     * force a GS program to be used, even if it's not necessary.
 227     */
 228    if (getenv("INTEL_FORCE_GS"))
 229       key->need_gs_prog = true;
 230 }
 231
 232 /* Calculate interpolants for triangle and line rasterization.
 233  */
 234 static void
 235 brw_upload_gs_prog(struct brw_context *brw)
 236 {
 237    struct brw_gs_prog_key key;
 238    /* Populate the key:
 239     */
 240    populate_key(brw, &key);
 241
 242    if (brw->gs.prog_active != key.need_gs_prog) {
 243       brw->state.dirty.cache |= CACHE_NEW_GS_PROG;
 244       brw->gs.prog_active = key.need_gs_prog;
 245    }
 246
 247    if (brw->gs.prog_active) {
 248       if (!brw_search_cache(&brw->cache, BRW_GS_PROG,
 249                             &key, sizeof(key),
 250                             &brw->gs.prog_offset, &brw->gs.prog_data)) {
 251          compile_gs_prog( brw, &key );
 252       }
 253    }
 254 }
 255
 256
 257 const struct brw_tracked_state brw_gs_prog = {
 258    .dirty = {
 259       .mesa  = (_NEW_LIGHT |
 260                 _NEW_TRANSFORM |
 261                 _NEW_TRANSFORM_FEEDBACK),
 262       .brw   = BRW_NEW_PRIMITIVE,
 263       .cache = CACHE_NEW_VS_PROG
 264    },
 265    .emit = brw_upload_gs_prog
 266 };