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

   1 /*
   2  Copyright (C) Intel Corp.  2006.  All Rights Reserved.
   3  Intel funded Tungsten Graphics 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 <keithw@vmware.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_ff_gs_prog(struct brw_context *brw,
  49                                struct brw_ff_gs_prog_key *key)
  50 {
  51    struct brw_ff_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_default_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          unreachable("Unexpected primitive type in Gen6 SOL program.");
 107       }
 108       gen6_sol_program(&c, key, num_verts, check_edge_flag);
 109    } else {
 110       /* On Gen4-5, we use the GS to decompose certain types of primitives.
 111        * Note that primitives which don't require a GS program have already
 112        * been weeded out by now.
 113        */
 114       switch (key->primitive) {
 115       case _3DPRIM_QUADLIST:
 116          brw_ff_gs_quads( &c, key );
 117          break;
 118       case _3DPRIM_QUADSTRIP:
 119          brw_ff_gs_quad_strip( &c, key );
 120          break;
 121       case _3DPRIM_LINELOOP:
 122          brw_ff_gs_lines( &c );
 123          break;
 124       default:
 125          ralloc_free(mem_ctx);
 126          return;
 127       }
 128    }
 129
 130    brw_compact_instructions(&c.func, 0, 0, NULL);
 131
 132    /* get the program
 133     */
 134    program = brw_get_program(&c.func, &program_size);
 135
 136    if (unlikely(INTEL_DEBUG & DEBUG_GS)) {
 137       fprintf(stderr, "gs:\n");
 138       brw_disassemble(brw, c.func.store, 0, program_size, stderr);
 139       fprintf(stderr, "\n");
 140     }
 141
 142    brw_upload_cache(&brw->cache, BRW_FF_GS_PROG,
 143                     &c.key, sizeof(c.key),
 144                     program, program_size,
 145                     &c.prog_data, sizeof(c.prog_data),
 146                     &brw->ff_gs.prog_offset, &brw->ff_gs.prog_data);
 147    ralloc_free(mem_ctx);
 148 }
 149
 150 static void populate_key(struct brw_context *brw,
 151                          struct brw_ff_gs_prog_key *key)
 152 {
 153    static const unsigned swizzle_for_offset[4] = {
 154       BRW_SWIZZLE4(0, 1, 2, 3),
 155       BRW_SWIZZLE4(1, 2, 3, 3),
 156       BRW_SWIZZLE4(2, 3, 3, 3),
 157       BRW_SWIZZLE4(3, 3, 3, 3)
 158    };
 159
 160    struct gl_context *ctx = &brw->ctx;
 161
 162    memset(key, 0, sizeof(*key));
 163
 164    /* CACHE_NEW_VS_PROG (part of VUE map) */
 165    key->attrs = brw->vs.prog_data->base.vue_map.slots_valid;
 166
 167    /* BRW_NEW_PRIMITIVE */
 168    key->primitive = brw->primitive;
 169
 170    /* _NEW_LIGHT */
 171    key->pv_first = (ctx->Light.ProvokingVertex == GL_FIRST_VERTEX_CONVENTION);
 172    if (key->primitive == _3DPRIM_QUADLIST && ctx->Light.ShadeModel != GL_FLAT) {
 173       /* Provide consistent primitive order with brw_set_prim's
 174        * optimization of single quads to trifans.
 175        */
 176       key->pv_first = true;
 177    }
 178
 179    if (brw->gen >= 7) {
 180       /* On Gen7 and later, we don't use GS (yet). */
 181       key->need_gs_prog = false;
 182    } else if (brw->gen == 6) {
 183       /* On Gen6, GS is used for transform feedback. */
 184       /* BRW_NEW_TRANSFORM_FEEDBACK */
 185       if (_mesa_is_xfb_active_and_unpaused(ctx)) {
 186          const struct gl_shader_program *shaderprog =
 187             ctx->_Shader->CurrentProgram[MESA_SHADER_VERTEX];
 188          const struct gl_transform_feedback_info *linked_xfb_info =
 189             &shaderprog->LinkedTransformFeedback;
 190          int i;
 191
 192          /* Make sure that the VUE slots won't overflow the unsigned chars in
 193           * key->transform_feedback_bindings[].
 194           */
 195          STATIC_ASSERT(BRW_VARYING_SLOT_COUNT <= 256);
 196
 197          /* Make sure that we don't need more binding table entries than we've
 198           * set aside for use in transform feedback.  (We shouldn't, since we
 199           * set aside enough binding table entries to have one per component).
 200           */
 201          assert(linked_xfb_info->NumOutputs <= BRW_MAX_SOL_BINDINGS);
 202
 203          key->need_gs_prog = true;
 204          key->num_transform_feedback_bindings = linked_xfb_info->NumOutputs;
 205          for (i = 0; i < key->num_transform_feedback_bindings; ++i) {
 206             key->transform_feedback_bindings[i] =
 207                linked_xfb_info->Outputs[i].OutputRegister;
 208             key->transform_feedback_swizzles[i] =
 209                swizzle_for_offset[linked_xfb_info->Outputs[i].ComponentOffset];
 210          }
 211       }
 212    } else {
 213       /* Pre-gen6, GS is used to transform QUADLIST, QUADSTRIP, and LINELOOP
 214        * into simpler primitives.
 215        */
 216       key->need_gs_prog = (brw->primitive == _3DPRIM_QUADLIST ||
 217                            brw->primitive == _3DPRIM_QUADSTRIP ||
 218                            brw->primitive == _3DPRIM_LINELOOP);
 219    }
 220 }
 221
 222 /* Calculate interpolants for triangle and line rasterization.
 223  */
 224 static void
 225 brw_upload_ff_gs_prog(struct brw_context *brw)
 226 {
 227    struct brw_ff_gs_prog_key key;
 228    /* Populate the key:
 229     */
 230    populate_key(brw, &key);
 231
 232    if (brw->ff_gs.prog_active != key.need_gs_prog) {
 233       brw->state.dirty.cache |= CACHE_NEW_FF_GS_PROG;
 234       brw->ff_gs.prog_active = key.need_gs_prog;
 235    }
 236
 237    if (brw->ff_gs.prog_active) {
 238       if (!brw_search_cache(&brw->cache, BRW_FF_GS_PROG,
 239                             &key, sizeof(key),
 240                             &brw->ff_gs.prog_offset, &brw->ff_gs.prog_data)) {
 241          compile_ff_gs_prog( brw, &key );
 242       }
 243    }
 244 }
 245
 246
 247 const struct brw_tracked_state brw_ff_gs_prog = {
 248    .dirty = {
 249       .mesa  = (_NEW_LIGHT),
 250       .brw   = (BRW_NEW_PRIMITIVE |
 251                 BRW_NEW_TRANSFORM_FEEDBACK),
 252       .cache = CACHE_NEW_VS_PROG
 253    },
 254    .emit = brw_upload_ff_gs_prog
 255 };