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/macros.h"
  33 #include "main/enums.h"
  34 #include "main/transformfeedback.h"
  35
  36 #include "intel_batchbuffer.h"
  37
  38 #include "brw_defines.h"
  39 #include "brw_context.h"
  40 #include "brw_util.h"
  41 #include "brw_state.h"
  42 #include "brw_ff_gs.h"
  43
  44 #include "util/ralloc.h"
  45
  46 void
  47 brw_codegen_ff_gs_prog(struct brw_context *brw,
  48                        struct brw_ff_gs_prog_key *key)
  49 {
  50    const struct gen_device_info *devinfo = &brw->screen->devinfo;
  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_vue_prog_data(brw->vs.base.prog_data)->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_codegen(&brw->screen->devinfo, &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 (devinfo->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, 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_with_labels(&brw->screen->devinfo, c.func.store,
 139                                   0, program_size, stderr);
 140       fprintf(stderr, "\n");
 141     }
 142
 143    brw_upload_cache(&brw->cache, BRW_CACHE_FF_GS_PROG,
 144                     &c.key, sizeof(c.key),
 145                     program, program_size,
 146                     &c.prog_data, sizeof(c.prog_data),
 147                     &brw->ff_gs.prog_offset, &brw->ff_gs.prog_data);
 148    ralloc_free(mem_ctx);
 149 }
 150
 151 static bool
 152 brw_ff_gs_state_dirty(const struct brw_context *brw)
 153 {
 154    return brw_state_dirty(brw,
 155                           _NEW_LIGHT,
 156                           BRW_NEW_PRIMITIVE |
 157                           BRW_NEW_TRANSFORM_FEEDBACK |
 158                           BRW_NEW_VS_PROG_DATA);
 159 }
 160
 161 static void
 162 brw_ff_gs_populate_key(struct brw_context *brw,
 163                        struct brw_ff_gs_prog_key *key)
 164 {
 165    const struct gen_device_info *devinfo = &brw->screen->devinfo;
 166    static const unsigned swizzle_for_offset[4] = {
 167       BRW_SWIZZLE4(0, 1, 2, 3),
 168       BRW_SWIZZLE4(1, 2, 3, 3),
 169       BRW_SWIZZLE4(2, 3, 3, 3),
 170       BRW_SWIZZLE4(3, 3, 3, 3)
 171    };
 172
 173    struct gl_context *ctx = &brw->ctx;
 174
 175    assert(devinfo->gen < 7);
 176
 177    memset(key, 0, sizeof(*key));
 178
 179    /* BRW_NEW_VS_PROG_DATA (part of VUE map) */
 180    key->attrs = brw_vue_prog_data(brw->vs.base.prog_data)->vue_map.slots_valid;
 181
 182    /* BRW_NEW_PRIMITIVE */
 183    key->primitive = brw->primitive;
 184
 185    /* _NEW_LIGHT */
 186    key->pv_first = (ctx->Light.ProvokingVertex == GL_FIRST_VERTEX_CONVENTION);
 187    if (key->primitive == _3DPRIM_QUADLIST && ctx->Light.ShadeModel != GL_FLAT) {
 188       /* Provide consistent primitive order with brw_set_prim's
 189        * optimization of single quads to trifans.
 190        */
 191       key->pv_first = true;
 192    }
 193
 194    if (devinfo->gen == 6) {
 195       /* On Gen6, GS is used for transform feedback. */
 196       /* BRW_NEW_TRANSFORM_FEEDBACK */
 197       if (_mesa_is_xfb_active_and_unpaused(ctx)) {
 198          const struct gl_program *prog =
 199             ctx->_Shader->CurrentProgram[MESA_SHADER_VERTEX];
 200          const struct gl_transform_feedback_info *linked_xfb_info =
 201             prog->sh.LinkedTransformFeedback;
 202          int i;
 203
 204          /* Make sure that the VUE slots won't overflow the unsigned chars in
 205           * key->transform_feedback_bindings[].
 206           */
 207          STATIC_ASSERT(BRW_VARYING_SLOT_COUNT <= 256);
 208
 209          /* Make sure that we don't need more binding table entries than we've
 210           * set aside for use in transform feedback.  (We shouldn't, since we
 211           * set aside enough binding table entries to have one per component).
 212           */
 213          assert(linked_xfb_info->NumOutputs <= BRW_MAX_SOL_BINDINGS);
 214
 215          key->need_gs_prog = true;
 216          key->num_transform_feedback_bindings = linked_xfb_info->NumOutputs;
 217          for (i = 0; i < key->num_transform_feedback_bindings; ++i) {
 218             key->transform_feedback_bindings[i] =
 219                linked_xfb_info->Outputs[i].OutputRegister;
 220             key->transform_feedback_swizzles[i] =
 221                swizzle_for_offset[linked_xfb_info->Outputs[i].ComponentOffset];
 222          }
 223       }
 224    } else {
 225       /* Pre-gen6, GS is used to transform QUADLIST, QUADSTRIP, and LINELOOP
 226        * into simpler primitives.
 227        */
 228       key->need_gs_prog = (brw->primitive == _3DPRIM_QUADLIST ||
 229                            brw->primitive == _3DPRIM_QUADSTRIP ||
 230                            brw->primitive == _3DPRIM_LINELOOP);
 231    }
 232 }
 233
 234 /* Calculate interpolants for triangle and line rasterization.
 235  */
 236 void
 237 brw_upload_ff_gs_prog(struct brw_context *brw)
 238 {
 239    struct brw_ff_gs_prog_key key;
 240
 241    if (!brw_ff_gs_state_dirty(brw))
 242       return;
 243
 244    /* Populate the key:
 245     */
 246    brw_ff_gs_populate_key(brw, &key);
 247
 248    if (brw->ff_gs.prog_active != key.need_gs_prog) {
 249       brw->ctx.NewDriverState |= BRW_NEW_FF_GS_PROG_DATA;
 250       brw->ff_gs.prog_active = key.need_gs_prog;
 251    }
 252
 253    if (brw->ff_gs.prog_active) {
 254       if (!brw_search_cache(&brw->cache, BRW_CACHE_FF_GS_PROG, &key,
 255                             sizeof(key), &brw->ff_gs.prog_offset,
 256                             &brw->ff_gs.prog_data, true)) {
 257          brw_codegen_ff_gs_prog(brw, &key);
 258       }
 259    }
 260 }