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_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_ff_gs_quads( &c, key );
 118          break;
 119       case _3DPRIM_QUADSTRIP:
 120          brw_ff_gs_quad_strip( &c, key );
 121          break;
 122       case _3DPRIM_LINELOOP:
 123          brw_ff_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_FF_GS_PROG,
 146                     &c.key, sizeof(c.key),
 147                     program, program_size,
 148                     &c.prog_data, sizeof(c.prog_data),
 149                     &brw->ff_gs.prog_offset, &brw->ff_gs.prog_data);
 150    ralloc_free(mem_ctx);
 151 }
 152
 153 static void populate_key(struct brw_context *brw,
 154                          struct brw_ff_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_ff_gs_prog(struct brw_context *brw)
 229 {
 230    struct brw_ff_gs_prog_key key;
 231    /* Populate the key:
 232     */
 233    populate_key(brw, &key);
 234
 235    if (brw->ff_gs.prog_active != key.need_gs_prog) {
 236       brw->state.dirty.cache |= CACHE_NEW_FF_GS_PROG;
 237       brw->ff_gs.prog_active = key.need_gs_prog;
 238    }
 239
 240    if (brw->ff_gs.prog_active) {
 241       if (!brw_search_cache(&brw->cache, BRW_FF_GS_PROG,
 242                             &key, sizeof(key),
 243                             &brw->ff_gs.prog_offset, &brw->ff_gs.prog_data)) {
 244          compile_ff_gs_prog( brw, &key );
 245       }
 246    }
 247 }
 248
 249
 250 const struct brw_tracked_state brw_ff_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_ff_gs_prog
 258 };