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 #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 intel_context *intel = &brw->intel;
  52    struct brw_gs_compile c;
  53    const GLuint *program;
  54    void *mem_ctx;
  55    GLuint program_size;
  56
  57    memset(&c, 0, sizeof(c));
  58
  59    c.key = *key;
  60    c.vue_map = brw->vs.prog_data->base.vue_map;
  61    c.nr_regs = (c.vue_map.num_slots + 1)/2;
  62
  63    mem_ctx = ralloc_context(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    static const unsigned swizzle_for_offset[4] = {
 158       BRW_SWIZZLE4(0, 1, 2, 3),
 159       BRW_SWIZZLE4(1, 2, 3, 3),
 160       BRW_SWIZZLE4(2, 3, 3, 3),
 161       BRW_SWIZZLE4(3, 3, 3, 3)
 162    };
 163
 164    struct gl_context *ctx = &brw->intel.ctx;
 165    struct intel_context *intel = &brw->intel;
 166
 167    memset(key, 0, sizeof(*key));
 168
 169    /* CACHE_NEW_VS_PROG (part of VUE map) */
 170    key->attrs = brw->vs.prog_data->base.vue_map.slots_valid;
 171
 172    /* BRW_NEW_PRIMITIVE */
 173    key->primitive = brw->primitive;
 174
 175    /* _NEW_LIGHT */
 176    key->pv_first = (ctx->Light.ProvokingVertex == GL_FIRST_VERTEX_CONVENTION);
 177    if (key->primitive == _3DPRIM_QUADLIST && ctx->Light.ShadeModel != GL_FLAT) {
 178       /* Provide consistent primitive order with brw_set_prim's
 179        * optimization of single quads to trifans.
 180        */
 181       key->pv_first = true;
 182    }
 183
 184    if (intel->gen >= 7) {
 185       /* On Gen7 and later, we don't use GS (yet). */
 186       key->need_gs_prog = false;
 187    } else if (intel->gen == 6) {
 188       /* On Gen6, GS is used for transform feedback. */
 189       /* BRW_NEW_TRANSFORM_FEEDBACK */
 190       if (_mesa_is_xfb_active_and_unpaused(ctx)) {
 191          const struct gl_shader_program *shaderprog =
 192             ctx->Shader.CurrentVertexProgram;
 193          const struct gl_transform_feedback_info *linked_xfb_info =
 194             &shaderprog->LinkedTransformFeedback;
 195          int i;
 196
 197          /* Make sure that the VUE slots won't overflow the unsigned chars in
 198           * key->transform_feedback_bindings[].
 199           */
 200          STATIC_ASSERT(BRW_VARYING_SLOT_COUNT <= 256);
 201
 202          /* Make sure that we don't need more binding table entries than we've
 203           * set aside for use in transform feedback.  (We shouldn't, since we
 204           * set aside enough binding table entries to have one per component).
 205           */
 206          assert(linked_xfb_info->NumOutputs <= BRW_MAX_SOL_BINDINGS);
 207
 208          key->need_gs_prog = true;
 209          key->num_transform_feedback_bindings = linked_xfb_info->NumOutputs;
 210          for (i = 0; i < key->num_transform_feedback_bindings; ++i) {
 211             key->transform_feedback_bindings[i] =
 212                linked_xfb_info->Outputs[i].OutputRegister;
 213             key->transform_feedback_swizzles[i] =
 214                swizzle_for_offset[linked_xfb_info->Outputs[i].ComponentOffset];
 215          }
 216       }
 217       /* On Gen6, GS is also used for rasterizer discard. */
 218       /* BRW_NEW_RASTERIZER_DISCARD */
 219       if (ctx->RasterDiscard) {
 220          key->need_gs_prog = true;
 221          key->rasterizer_discard = true;
 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 static void
 236 brw_upload_gs_prog(struct brw_context *brw)
 237 {
 238    struct brw_gs_prog_key key;
 239    /* Populate the key:
 240     */
 241    populate_key(brw, &key);
 242
 243    if (brw->gs.prog_active != key.need_gs_prog) {
 244       brw->state.dirty.cache |= CACHE_NEW_GS_PROG;
 245       brw->gs.prog_active = key.need_gs_prog;
 246    }
 247
 248    if (brw->gs.prog_active) {
 249       if (!brw_search_cache(&brw->cache, BRW_GS_PROG,
 250                             &key, sizeof(key),
 251                             &brw->gs.prog_offset, &brw->gs.prog_data)) {
 252          compile_gs_prog( brw, &key );
 253       }
 254    }
 255 }
 256
 257
 258 const struct brw_tracked_state brw_gs_prog = {
 259    .dirty = {
 260       .mesa  = (_NEW_LIGHT),
 261       .brw   = (BRW_NEW_PRIMITIVE |
 262                 BRW_NEW_TRANSFORM_FEEDBACK |
 263                 BRW_NEW_RASTERIZER_DISCARD),
 264       .cache = CACHE_NEW_VS_PROG
 265    },
 266    .emit = brw_upload_gs_prog
 267 };