src/gallium/auxiliary/draw/draw_gs.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2009 VMware, Inc.
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * 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, sub license, 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 portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
  22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27
  28 #include "draw_gs.h"
  29
  30 #include "draw_private.h"
  31 #include "draw_context.h"
  32
  33 #include "tgsi/tgsi_parse.h"
  34 #include "tgsi/tgsi_exec.h"
  35
  36 #include "pipe/p_shader_tokens.h"
  37
  38 #include "util/u_math.h"
  39 #include "util/u_memory.h"
  40 #include "util/u_prim.h"
  41
  42 /* fixme: move it from here */
  43 #define MAX_PRIMITIVES 64
  44
  45 boolean
  46 draw_gs_init( struct draw_context *draw )
  47 {
  48    draw->gs.tgsi.machine = tgsi_exec_machine_create();
  49    if (!draw->gs.tgsi.machine)
  50       return FALSE;
  51
  52    draw->gs.tgsi.machine->Primitives = align_malloc(
  53       MAX_PRIMITIVES * sizeof(struct tgsi_exec_vector), 16);
  54    if (!draw->gs.tgsi.machine->Primitives)
  55       return FALSE;
  56    memset(draw->gs.tgsi.machine->Primitives, 0,
  57           MAX_PRIMITIVES * sizeof(struct tgsi_exec_vector));
  58
  59    return TRUE;
  60 }
  61
  62 void draw_gs_destroy( struct draw_context *draw )
  63 {
  64    if (!draw->gs.tgsi.machine)
  65       return;
  66
  67    align_free(draw->gs.tgsi.machine->Primitives);
  68
  69    tgsi_exec_machine_destroy(draw->gs.tgsi.machine);
  70 }
  71
  72 void
  73 draw_gs_set_constants(struct draw_context *draw,
  74                       unsigned slot,
  75                       const void *constants,
  76                       unsigned size)
  77 {
  78    /* noop. added here for symmetry with the VS
  79     * code and in case we'll ever want to allign
  80     * the constants, e.g. when we'll change to a
  81     * different interpreter */
  82 }
  83
  84
  85 struct draw_geometry_shader *
  86 draw_create_geometry_shader(struct draw_context *draw,
  87                             const struct pipe_shader_state *state)
  88 {
  89    struct draw_geometry_shader *gs;
  90    unsigned i;
  91
  92    gs = CALLOC_STRUCT(draw_geometry_shader);
  93
  94    if (!gs)
  95       return NULL;
  96
  97    gs->draw = draw;
  98    gs->state = *state;
  99    gs->state.tokens = tgsi_dup_tokens(state->tokens);
 100    if (!gs->state.tokens) {
 101       FREE(gs);
 102       return NULL;
 103    }
 104
 105    tgsi_scan_shader(state->tokens, &gs->info);
 106
 107    /* setup the defaults */
 108    gs->input_primitive = PIPE_PRIM_TRIANGLES;
 109    gs->output_primitive = PIPE_PRIM_TRIANGLE_STRIP;
 110    gs->max_output_vertices = 32;
 111
 112    for (i = 0; i < gs->info.num_properties; ++i) {
 113       if (gs->info.properties[i].name ==
 114           TGSI_PROPERTY_GS_INPUT_PRIM)
 115          gs->input_primitive = gs->info.properties[i].data[0];
 116       else if (gs->info.properties[i].name ==
 117                TGSI_PROPERTY_GS_OUTPUT_PRIM)
 118          gs->output_primitive = gs->info.properties[i].data[0];
 119       else if (gs->info.properties[i].name ==
 120                TGSI_PROPERTY_GS_MAX_OUTPUT_VERTICES)
 121          gs->max_output_vertices = gs->info.properties[i].data[0];
 122    }
 123
 124    gs->machine = draw->gs.tgsi.machine;
 125
 126    if (gs)
 127    {
 128       uint i;
 129       for (i = 0; i < gs->info.num_outputs; i++) {
 130          if (gs->info.output_semantic_name[i] == TGSI_SEMANTIC_POSITION &&
 131              gs->info.output_semantic_index[i] == 0)
 132             gs->position_output = i;
 133       }
 134    }
 135
 136    return gs;
 137 }
 138
 139 void draw_bind_geometry_shader(struct draw_context *draw,
 140                                struct draw_geometry_shader *dgs)
 141 {
 142    draw_do_flush(draw, DRAW_FLUSH_STATE_CHANGE);
 143
 144    if (dgs) {
 145       draw->gs.geometry_shader = dgs;
 146       draw->gs.num_gs_outputs = dgs->info.num_outputs;
 147       draw->gs.position_output = dgs->position_output;
 148       draw_geometry_shader_prepare(dgs, draw);
 149    }
 150    else {
 151       draw->gs.geometry_shader = NULL;
 152       draw->gs.num_gs_outputs = 0;
 153    }
 154 }
 155
 156 void draw_delete_geometry_shader(struct draw_context *draw,
 157                                  struct draw_geometry_shader *dgs)
 158 {
 159    FREE(dgs->primitive_lengths);
 160    FREE((void*) dgs->state.tokens);
 161    FREE(dgs);
 162 }
 163
 164 /*#define DEBUG_OUTPUTS 1*/
 165 static INLINE void
 166 draw_geometry_fetch_outputs(struct draw_geometry_shader *shader,
 167                             unsigned num_primitives,
 168                             float (**p_output)[4])
 169 {
 170    struct tgsi_exec_machine *machine = shader->machine;
 171    unsigned prim_idx, j, slot;
 172    float (*output)[4];
 173
 174    output = *p_output;
 175
 176    /* Unswizzle all output results.
 177     */
 178
 179    for (prim_idx = 0; prim_idx < num_primitives; ++prim_idx) {
 180       unsigned num_verts_per_prim = machine->Primitives[prim_idx];
 181       shader->primitive_lengths[prim_idx +   shader->emitted_primitives] =
 182          machine->Primitives[prim_idx];
 183       shader->emitted_vertices += num_verts_per_prim;
 184       for (j = 0; j < num_verts_per_prim; j++) {
 185          int idx = (prim_idx * num_verts_per_prim + j) *
 186                    shader->info.num_outputs;
 187 #ifdef DEBUG_OUTPUTS
 188          debug_printf("%d) Output vert:\n", idx / shader->info.num_outputs);
 189 #endif
 190          for (slot = 0; slot < shader->info.num_outputs; slot++) {
 191             output[slot][0] = machine->Outputs[idx + slot].xyzw[0].f[0];
 192             output[slot][1] = machine->Outputs[idx + slot].xyzw[1].f[0];
 193             output[slot][2] = machine->Outputs[idx + slot].xyzw[2].f[0];
 194             output[slot][3] = machine->Outputs[idx + slot].xyzw[3].f[0];
 195 #ifdef DEBUG_OUTPUTS
 196             debug_printf("\t%d: %f %f %f %f\n", slot,
 197                          output[slot][0],
 198                          output[slot][1],
 199                          output[slot][2],
 200                          output[slot][3]);
 201 #endif
 202             debug_assert(!util_is_inf_or_nan(output[slot][0]));
 203          }
 204          output = (float (*)[4])((char *)output + shader->vertex_size);
 205       }
 206    }
 207    *p_output = output;
 208          shader->emitted_primitives += num_primitives;
 209 }
 210
 211 /*#define DEBUG_INPUTS 1*/
 212 static void draw_fetch_gs_input(struct draw_geometry_shader *shader,
 213                                 unsigned *indices,
 214                                 unsigned num_vertices,
 215                                 unsigned prim_idx)
 216 {
 217    struct tgsi_exec_machine *machine = shader->machine;
 218    unsigned slot, vs_slot, i;
 219    unsigned input_vertex_stride = shader->input_vertex_stride;
 220    const float (*input_ptr)[4];
 221
 222    input_ptr = shader->input;
 223
 224    for (i = 0; i < num_vertices; ++i) {
 225       const float (*input)[4];
 226 #if DEBUG_INPUTS
 227       debug_printf("%d) vertex index = %d (prim idx = %d)\n",
 228                    i, indices[i], prim_idx);
 229 #endif
 230       input = (const float (*)[4])(
 231          (const char *)input_ptr + (indices[i] * input_vertex_stride));
 232       for (slot = 0, vs_slot = 0; slot < shader->info.num_inputs; ++slot) {
 233          unsigned idx = i * TGSI_EXEC_MAX_INPUT_ATTRIBS + slot;
 234          if (shader->info.input_semantic_name[slot] == TGSI_SEMANTIC_PRIMID) {
 235             machine->Inputs[idx].xyzw[0].f[prim_idx] =
 236                (float)shader->in_prim_idx;
 237             machine->Inputs[idx].xyzw[1].f[prim_idx] =
 238                (float)shader->in_prim_idx;
 239             machine->Inputs[idx].xyzw[2].f[prim_idx] =
 240                (float)shader->in_prim_idx;
 241             machine->Inputs[idx].xyzw[3].f[prim_idx] =
 242                (float)shader->in_prim_idx;
 243          } else {
 244 #if DEBUG_INPUTS
 245             debug_printf("\tSlot = %d, vs_slot = %d, idx = %d:\n",
 246                          slot, vs_slot, idx);
 247 #endif
 248 #if 1
 249             assert(!util_is_inf_or_nan(input[vs_slot][0]));
 250             assert(!util_is_inf_or_nan(input[vs_slot][1]));
 251             assert(!util_is_inf_or_nan(input[vs_slot][2]));
 252             assert(!util_is_inf_or_nan(input[vs_slot][3]));
 253 #endif
 254             machine->Inputs[idx].xyzw[0].f[prim_idx] = input[vs_slot][0];
 255             machine->Inputs[idx].xyzw[1].f[prim_idx] = input[vs_slot][1];
 256             machine->Inputs[idx].xyzw[2].f[prim_idx] = input[vs_slot][2];
 257             machine->Inputs[idx].xyzw[3].f[prim_idx] = input[vs_slot][3];
 258 #if DEBUG_INPUTS
 259             debug_printf("\t\t%f %f %f %f\n",
 260                          machine->Inputs[idx].xyzw[0].f[prim_idx],
 261                          machine->Inputs[idx].xyzw[1].f[prim_idx],
 262                          machine->Inputs[idx].xyzw[2].f[prim_idx],
 263                          machine->Inputs[idx].xyzw[3].f[prim_idx]);
 264 #endif
 265             ++vs_slot;
 266          }
 267       }
 268    }
 269 }
 270
 271 static void gs_flush(struct draw_geometry_shader *shader,
 272                      unsigned input_primitives)
 273 {
 274    unsigned out_prim_count;
 275    struct tgsi_exec_machine *machine = shader->machine;
 276
 277    debug_assert(input_primitives > 0 &&
 278                 input_primitives < 4);
 279
 280    tgsi_set_exec_mask(machine,
 281                       1,
 282                       input_primitives > 1,
 283                       input_primitives > 2,
 284                       input_primitives > 3);
 285
 286    /* run interpreter */
 287    tgsi_exec_machine_run(machine);
 288
 289    out_prim_count =
 290       machine->Temps[TGSI_EXEC_TEMP_PRIMITIVE_I].xyzw[TGSI_EXEC_TEMP_PRIMITIVE_C].u[0];
 291
 292 #if 0
 293    debug_printf("PRIM emitted prims = %d (verts=%d), cur prim count = %d\n",
 294                 shader->emitted_primitives, shader->emitted_vertices,
 295                 out_prim_count);
 296 #endif
 297    draw_geometry_fetch_outputs(shader, out_prim_count,
 298                                &shader->tmp_output);
 299 }
 300
 301 static void gs_point(struct draw_geometry_shader *shader,
 302                      int idx)
 303 {
 304    unsigned indices[1];
 305
 306    indices[0] = idx;
 307
 308    draw_fetch_gs_input(shader, indices, 1, 0);
 309    ++shader->in_prim_idx;
 310
 311    gs_flush(shader, 1);
 312 }
 313
 314 static void gs_line(struct draw_geometry_shader *shader,
 315                     int i0, int i1)
 316 {
 317    unsigned indices[2];
 318
 319    indices[0] = i0;
 320    indices[1] = i1;
 321
 322    draw_fetch_gs_input(shader, indices, 2, 0);
 323    ++shader->in_prim_idx;
 324
 325    gs_flush(shader, 1);
 326 }
 327
 328 static void gs_line_adj(struct draw_geometry_shader *shader,
 329                         int i0, int i1, int i2, int i3)
 330 {
 331    unsigned indices[4];
 332
 333    indices[0] = i0;
 334    indices[1] = i1;
 335    indices[2] = i2;
 336    indices[3] = i3;
 337
 338    draw_fetch_gs_input(shader, indices, 4, 0);
 339    ++shader->in_prim_idx;
 340
 341    gs_flush(shader, 1);
 342 }
 343
 344 static void gs_tri(struct draw_geometry_shader *shader,
 345                    int i0, int i1, int i2)
 346 {
 347    unsigned indices[3];
 348
 349    indices[0] = i0;
 350    indices[1] = i1;
 351    indices[2] = i2;
 352
 353    draw_fetch_gs_input(shader, indices, 3, 0);
 354    ++shader->in_prim_idx;
 355
 356    gs_flush(shader, 1);
 357 }
 358
 359 static void gs_tri_adj(struct draw_geometry_shader *shader,
 360                        int i0, int i1, int i2,
 361                        int i3, int i4, int i5)
 362 {
 363    unsigned indices[6];
 364
 365    indices[0] = i0;
 366    indices[1] = i1;
 367    indices[2] = i2;
 368    indices[3] = i3;
 369    indices[4] = i4;
 370    indices[5] = i5;
 371
 372    draw_fetch_gs_input(shader, indices, 6, 0);
 373    ++shader->in_prim_idx;
 374
 375    gs_flush(shader, 1);
 376 }
 377
 378 #define FUNC         gs_run
 379 #define GET_ELT(idx) (idx)
 380 #include "draw_gs_tmp.h"
 381
 382
 383 #define FUNC         gs_run_elts
 384 #define LOCAL_VARS   const ushort *elts = input_prims->elts;
 385 #define GET_ELT(idx) (elts[idx])
 386 #include "draw_gs_tmp.h"
 387
 388
 389 /**
 390  * Execute geometry shader using TGSI interpreter.
 391  */
 392 int draw_geometry_shader_run(struct draw_geometry_shader *shader,
 393                              const void *constants[PIPE_MAX_CONSTANT_BUFFERS],
 394                              const unsigned constants_size[PIPE_MAX_CONSTANT_BUFFERS],
 395                              const struct draw_vertex_info *input_verts,
 396                              const struct draw_prim_info *input_prim,
 397                              struct draw_vertex_info *output_verts,
 398                              struct draw_prim_info *output_prims )
 399 {
 400    const float (*input)[4] = (const float (*)[4])input_verts->verts->data;
 401    unsigned input_stride = input_verts->vertex_size;
 402    unsigned vertex_size = input_verts->vertex_size;
 403    struct tgsi_exec_machine *machine = shader->machine;
 404    unsigned num_input_verts = input_prim->linear ?
 405                               input_verts->count :
 406                               input_prim->count;
 407    unsigned num_in_primitives =
 408       MAX2(u_gs_prims_for_vertices(input_prim->prim, num_input_verts),
 409            u_gs_prims_for_vertices(shader->input_primitive, num_input_verts));
 410    unsigned max_out_prims = u_gs_prims_for_vertices(shader->output_primitive,
 411                                                     shader->max_output_vertices)
 412                             * num_in_primitives;
 413
 414    output_verts->vertex_size = input_verts->vertex_size;
 415    output_verts->stride = input_verts->vertex_size;
 416    output_verts->verts =
 417       (struct vertex_header *)MALLOC(input_verts->vertex_size *
 418                                      num_in_primitives *
 419                                      shader->max_output_vertices);
 420
 421
 422 #if 0
 423    debug_printf("%s count = %d (in prims # = %d)\n",
 424                 __FUNCTION__, num_input_verts, num_in_primitives);
 425    debug_printf("\tlinear = %d, prim_info->count = %d\n",
 426                 input_prim->linear, input_prim->count);
 427    debug_printf("\tprimt pipe = %d, shader in = %d, shader out = %d, max out = %d\n",
 428                 input_prim->prim, shader->input_primitive,
 429                 shader->output_primitive,
 430                 shader->max_output_vertices);
 431 #endif
 432
 433    shader->emitted_vertices = 0;
 434    shader->emitted_primitives = 0;
 435    shader->vertex_size = vertex_size;
 436    shader->tmp_output = (float (*)[4])output_verts->verts->data;
 437    shader->in_prim_idx = 0;
 438    shader->input_vertex_stride = input_stride;
 439    shader->input = input;
 440    FREE(shader->primitive_lengths);
 441    shader->primitive_lengths = MALLOC(max_out_prims * sizeof(unsigned));
 442
 443    tgsi_exec_set_constant_buffers(machine, PIPE_MAX_CONSTANT_BUFFERS,
 444                                   constants, constants_size);
 445
 446    if (input_prim->linear)
 447       gs_run(shader, input_prim, input_verts,
 448              output_prims, output_verts);
 449    else
 450       gs_run_elts(shader, input_prim, input_verts,
 451                   output_prims, output_verts);
 452
 453    /* Update prim_info:
 454     */
 455    output_prims->linear = TRUE;
 456    output_prims->elts = NULL;
 457    output_prims->start = 0;
 458    output_prims->count = shader->emitted_vertices;
 459    output_prims->prim = shader->output_primitive;
 460    output_prims->flags = 0x0;
 461    output_prims->primitive_lengths = shader->primitive_lengths;
 462    output_prims->primitive_count = shader->emitted_primitives;
 463    output_verts->count = shader->emitted_vertices;
 464
 465 #if 0
 466    debug_printf("GS finished, prims = %d, verts = %d\n",
 467                 output_prims->primitive_count,
 468                 output_verts->count);
 469 #endif
 470
 471    return shader->emitted_vertices;
 472 }
 473
 474 void draw_geometry_shader_prepare(struct draw_geometry_shader *shader,
 475                                   struct draw_context *draw)
 476 {
 477    if (shader && shader->machine->Tokens != shader->state.tokens) {
 478       tgsi_exec_machine_bind_shader(shader->machine,
 479                                     shader->state.tokens,
 480                                     draw->gs.tgsi.num_samplers,
 481                                     draw->gs.tgsi.samplers);
 482    }
 483 }