src/mesa/drivers/dri/i965/brw_ff_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_ff_gs.h"
  45
  46 #include "util/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_CACHE_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 bool
 151 brw_ff_gs_state_dirty(struct brw_context *brw)
 152 {
 153    return brw_state_dirty(brw,
 154                           _NEW_LIGHT,
 155                           BRW_NEW_PRIMITIVE |
 156                           BRW_NEW_TRANSFORM_FEEDBACK |
 157                           BRW_NEW_VS_PROG_DATA);
 158 }
 159
 160 static void
 161 brw_ff_gs_populate_key(struct brw_context *brw,
 162                        struct brw_ff_gs_prog_key *key)
 163 {
 164    static const unsigned swizzle_for_offset[4] = {
 165       BRW_SWIZZLE4(0, 1, 2, 3),
 166       BRW_SWIZZLE4(1, 2, 3, 3),
 167       BRW_SWIZZLE4(2, 3, 3, 3),
 168       BRW_SWIZZLE4(3, 3, 3, 3)
 169    };
 170
 171    struct gl_context *ctx = &brw->ctx;
 172
 173    memset(key, 0, sizeof(*key));
 174
 175    /* BRW_NEW_VS_PROG_DATA (part of VUE map) */
 176    key->attrs = brw->vs.prog_data->base.vue_map.slots_valid;
 177
 178    /* BRW_NEW_PRIMITIVE */
 179    key->primitive = brw->primitive;
 180
 181    /* _NEW_LIGHT */
 182    key->pv_first = (ctx->Light.ProvokingVertex == GL_FIRST_VERTEX_CONVENTION);
 183    if (key->primitive == _3DPRIM_QUADLIST && ctx->Light.ShadeModel != GL_FLAT) {
 184       /* Provide consistent primitive order with brw_set_prim's
 185        * optimization of single quads to trifans.
 186        */
 187       key->pv_first = true;
 188    }
 189
 190    if (brw->gen >= 7) {
 191       /* On Gen7 and later, we don't use GS (yet). */
 192       key->need_gs_prog = false;
 193    } else if (brw->gen == 6) {
 194       /* On Gen6, GS is used for transform feedback. */
 195       /* BRW_NEW_TRANSFORM_FEEDBACK */
 196       if (_mesa_is_xfb_active_and_unpaused(ctx)) {
 197          const struct gl_shader_program *shaderprog =
 198             ctx->_Shader->CurrentProgram[MESA_SHADER_VERTEX];
 199          const struct gl_transform_feedback_info *linked_xfb_info =
 200             &shaderprog->LinkedTransformFeedback;
 201          int i;
 202
 203          /* Make sure that the VUE slots won't overflow the unsigned chars in
 204           * key->transform_feedback_bindings[].
 205           */
 206          STATIC_ASSERT(BRW_VARYING_SLOT_COUNT <= 256);
 207
 208          /* Make sure that we don't need more binding table entries than we've
 209           * set aside for use in transform feedback.  (We shouldn't, since we
 210           * set aside enough binding table entries to have one per component).
 211           */
 212          assert(linked_xfb_info->NumOutputs <= BRW_MAX_SOL_BINDINGS);
 213
 214          key->need_gs_prog = true;
 215          key->num_transform_feedback_bindings = linked_xfb_info->NumOutputs;
 216          for (i = 0; i < key->num_transform_feedback_bindings; ++i) {
 217             key->transform_feedback_bindings[i] =
 218                linked_xfb_info->Outputs[i].OutputRegister;
 219             key->transform_feedback_swizzles[i] =
 220                swizzle_for_offset[linked_xfb_info->Outputs[i].ComponentOffset];
 221          }
 222       }
 223    } else {
 224       /* Pre-gen6, GS is used to transform QUADLIST, QUADSTRIP, and LINELOOP
 225        * into simpler primitives.
 226        */
 227       key->need_gs_prog = (brw->primitive == _3DPRIM_QUADLIST ||
 228                            brw->primitive == _3DPRIM_QUADSTRIP ||
 229                            brw->primitive == _3DPRIM_LINELOOP);
 230    }
 231 }
 232
 233 /* Calculate interpolants for triangle and line rasterization.
 234  */
 235 void
 236 brw_upload_ff_gs_prog(struct brw_context *brw)
 237 {
 238    struct brw_ff_gs_prog_key key;
 239
 240    if (!brw_ff_gs_state_dirty(brw))
 241       return;
 242
 243    /* Populate the key:
 244     */
 245    brw_ff_gs_populate_key(brw, &key);
 246
 247    if (brw->ff_gs.prog_active != key.need_gs_prog) {
 248       brw->ctx.NewDriverState |= BRW_NEW_FF_GS_PROG_DATA;
 249       brw->ff_gs.prog_active = key.need_gs_prog;
 250    }
 251
 252    if (brw->ff_gs.prog_active) {
 253       if (!brw_search_cache(&brw->cache, BRW_CACHE_FF_GS_PROG,
 254                             &key, sizeof(key),
 255                             &brw->ff_gs.prog_offset, &brw->ff_gs.prog_data)) {
 256          compile_ff_gs_prog( brw, &key );
 257       }
 258    }
 259 }
 260
 261 void gen6_brw_upload_ff_gs_prog(struct brw_context *brw)
 262 {
 263    brw_upload_ff_gs_prog(brw);
 264 }