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 void
  49 brw_codegen_ff_gs_prog(struct brw_context *brw,
  50                        struct brw_ff_gs_prog_key *key)
  51 {
  52    struct brw_ff_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_codegen(brw->intelScreen->devinfo, &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_default_mask_control(&c.func, BRW_MASK_DISABLE);
  75
  76    if (brw->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          unreachable("Unexpected primitive type in Gen6 SOL program.");
 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    brw_compact_instructions(&c.func, 0, 0, NULL);
 132
 133    /* get the program
 134     */
 135    program = brw_get_program(&c.func, &program_size);
 136
 137    if (unlikely(INTEL_DEBUG & DEBUG_GS)) {
 138       fprintf(stderr, "gs:\n");
 139       brw_disassemble(brw->intelScreen->devinfo, c.func.store,
 140                       0, program_size, stderr);
 141       fprintf(stderr, "\n");
 142     }
 143
 144    brw_upload_cache(&brw->cache, BRW_CACHE_FF_GS_PROG,
 145                     &c.key, sizeof(c.key),
 146                     program, program_size,
 147                     &c.prog_data, sizeof(c.prog_data),
 148                     &brw->ff_gs.prog_offset, &brw->ff_gs.prog_data);
 149    ralloc_free(mem_ctx);
 150 }
 151
 152 static bool
 153 brw_ff_gs_state_dirty(struct brw_context *brw)
 154 {
 155    return brw_state_dirty(brw,
 156                           _NEW_LIGHT,
 157                           BRW_NEW_PRIMITIVE |
 158                           BRW_NEW_TRANSFORM_FEEDBACK |
 159                           BRW_NEW_VS_PROG_DATA);
 160 }
 161
 162 static void
 163 brw_ff_gs_populate_key(struct brw_context *brw,
 164                        struct brw_ff_gs_prog_key *key)
 165 {
 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    memset(key, 0, sizeof(*key));
 176
 177    /* BRW_NEW_VS_PROG_DATA (part of VUE map) */
 178    key->attrs = brw->vs.prog_data->base.vue_map.slots_valid;
 179
 180    /* BRW_NEW_PRIMITIVE */
 181    key->primitive = brw->primitive;
 182
 183    /* _NEW_LIGHT */
 184    key->pv_first = (ctx->Light.ProvokingVertex == GL_FIRST_VERTEX_CONVENTION);
 185    if (key->primitive == _3DPRIM_QUADLIST && ctx->Light.ShadeModel != GL_FLAT) {
 186       /* Provide consistent primitive order with brw_set_prim's
 187        * optimization of single quads to trifans.
 188        */
 189       key->pv_first = true;
 190    }
 191
 192    if (brw->gen >= 7) {
 193       /* On Gen7 and later, we don't use GS (yet). */
 194       key->need_gs_prog = false;
 195    } else if (brw->gen == 6) {
 196       /* On Gen6, GS is used for transform feedback. */
 197       /* BRW_NEW_TRANSFORM_FEEDBACK */
 198       if (_mesa_is_xfb_active_and_unpaused(ctx)) {
 199          const struct gl_shader_program *shaderprog =
 200             ctx->_Shader->CurrentProgram[MESA_SHADER_VERTEX];
 201          const struct gl_transform_feedback_info *linked_xfb_info =
 202             &shaderprog->LinkedTransformFeedback;
 203          int i;
 204
 205          /* Make sure that the VUE slots won't overflow the unsigned chars in
 206           * key->transform_feedback_bindings[].
 207           */
 208          STATIC_ASSERT(BRW_VARYING_SLOT_COUNT <= 256);
 209
 210          /* Make sure that we don't need more binding table entries than we've
 211           * set aside for use in transform feedback.  (We shouldn't, since we
 212           * set aside enough binding table entries to have one per component).
 213           */
 214          assert(linked_xfb_info->NumOutputs <= BRW_MAX_SOL_BINDINGS);
 215
 216          key->need_gs_prog = true;
 217          key->num_transform_feedback_bindings = linked_xfb_info->NumOutputs;
 218          for (i = 0; i < key->num_transform_feedback_bindings; ++i) {
 219             key->transform_feedback_bindings[i] =
 220                linked_xfb_info->Outputs[i].OutputRegister;
 221             key->transform_feedback_swizzles[i] =
 222                swizzle_for_offset[linked_xfb_info->Outputs[i].ComponentOffset];
 223          }
 224       }
 225    } else {
 226       /* Pre-gen6, GS is used to transform QUADLIST, QUADSTRIP, and LINELOOP
 227        * into simpler primitives.
 228        */
 229       key->need_gs_prog = (brw->primitive == _3DPRIM_QUADLIST ||
 230                            brw->primitive == _3DPRIM_QUADSTRIP ||
 231                            brw->primitive == _3DPRIM_LINELOOP);
 232    }
 233 }
 234
 235 /* Calculate interpolants for triangle and line rasterization.
 236  */
 237 void
 238 brw_upload_ff_gs_prog(struct brw_context *brw)
 239 {
 240    struct brw_ff_gs_prog_key key;
 241
 242    if (!brw_ff_gs_state_dirty(brw))
 243       return;
 244
 245    /* Populate the key:
 246     */
 247    brw_ff_gs_populate_key(brw, &key);
 248
 249    if (brw->ff_gs.prog_active != key.need_gs_prog) {
 250       brw->ctx.NewDriverState |= BRW_NEW_FF_GS_PROG_DATA;
 251       brw->ff_gs.prog_active = key.need_gs_prog;
 252    }
 253
 254    if (brw->ff_gs.prog_active) {
 255       if (!brw_search_cache(&brw->cache, BRW_CACHE_FF_GS_PROG,
 256                             &key, sizeof(key),
 257                             &brw->ff_gs.prog_offset, &brw->ff_gs.prog_data)) {
 258          brw_codegen_ff_gs_prog(brw, &key);
 259       }
 260    }
 261 }
 262
 263 void gen6_brw_upload_ff_gs_prog(struct brw_context *brw)
 264 {
 265    brw_upload_ff_gs_prog(brw);
 266 }