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_compile_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_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_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, c.func.store, 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(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    static const unsigned swizzle_for_offset[4] = {
 166       BRW_SWIZZLE4(0, 1, 2, 3),
 167       BRW_SWIZZLE4(1, 2, 3, 3),
 168       BRW_SWIZZLE4(2, 3, 3, 3),
 169       BRW_SWIZZLE4(3, 3, 3, 3)
 170    };
 171
 172    struct gl_context *ctx = &brw->ctx;
 173
 174    memset(key, 0, sizeof(*key));
 175
 176    /* BRW_NEW_VS_PROG_DATA (part of VUE map) */
 177    key->attrs = brw->vs.prog_data->base.vue_map.slots_valid;
 178
 179    /* BRW_NEW_PRIMITIVE */
 180    key->primitive = brw->primitive;
 181
 182    /* _NEW_LIGHT */
 183    key->pv_first = (ctx->Light.ProvokingVertex == GL_FIRST_VERTEX_CONVENTION);
 184    if (key->primitive == _3DPRIM_QUADLIST && ctx->Light.ShadeModel != GL_FLAT) {
 185       /* Provide consistent primitive order with brw_set_prim's
 186        * optimization of single quads to trifans.
 187        */
 188       key->pv_first = true;
 189    }
 190
 191    if (brw->gen >= 7) {
 192       /* On Gen7 and later, we don't use GS (yet). */
 193       key->need_gs_prog = false;
 194    } else if (brw->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_shader_program *shaderprog =
 199             ctx->_Shader->CurrentProgram[MESA_SHADER_VERTEX];
 200          const struct gl_transform_feedback_info *linked_xfb_info =
 201             &shaderprog->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,
 255                             &key, sizeof(key),
 256                             &brw->ff_gs.prog_offset, &brw->ff_gs.prog_data)) {
 257          brw_compile_ff_gs_prog(brw, &key);
 258       }
 259    }
 260 }
 261
 262 void gen6_brw_upload_ff_gs_prog(struct brw_context *brw)
 263 {
 264    brw_upload_ff_gs_prog(brw);
 265 }