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
  41 #define MAX_PRIM_VERTICES 6
  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.machine = tgsi_exec_machine_create();
  49    if (!draw->gs.machine)
  50       return FALSE;
  51
  52    draw->gs.machine->Primitives = align_malloc(
  53       MAX_PRIMITIVES * sizeof(struct tgsi_exec_vector), 16);
  54    if (!draw->gs.machine->Primitives)
  55       return FALSE;
  56    memset(draw->gs.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.machine)
  65       return;
  66
  67    align_free(draw->gs.machine->Primitives);
  68
  69    tgsi_exec_machine_destroy(draw->gs.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 }
  79
  80
  81 struct draw_geometry_shader *
  82 draw_create_geometry_shader(struct draw_context *draw,
  83                             const struct pipe_shader_state *state)
  84 {
  85    struct draw_geometry_shader *gs;
  86    int i;
  87
  88    gs = CALLOC_STRUCT(draw_geometry_shader);
  89
  90    if (!gs)
  91       return NULL;
  92
  93    gs->state = *state;
  94    gs->state.tokens = tgsi_dup_tokens(state->tokens);
  95    if (!gs->state.tokens) {
  96       FREE(gs);
  97       return NULL;
  98    }
  99
 100    tgsi_scan_shader(state->tokens, &gs->info);
 101
 102    /* setup the defaults */
 103    gs->input_primitive = PIPE_PRIM_TRIANGLES;
 104    gs->output_primitive = PIPE_PRIM_TRIANGLE_STRIP;
 105    gs->max_output_vertices = 32;
 106
 107    for (i = 0; i < gs->info.num_properties; ++i) {
 108       if (gs->info.properties[i].name ==
 109           TGSI_PROPERTY_GS_INPUT_PRIM)
 110          gs->input_primitive = gs->info.properties[i].data[0];
 111       else if (gs->info.properties[i].name ==
 112                TGSI_PROPERTY_GS_OUTPUT_PRIM)
 113          gs->output_primitive = gs->info.properties[i].data[0];
 114       else if (gs->info.properties[i].name ==
 115                TGSI_PROPERTY_GS_MAX_VERTICES)
 116          gs->max_output_vertices = gs->info.properties[i].data[0];
 117    }
 118
 119    gs->machine = draw->gs.machine;
 120
 121    if (gs)
 122    {
 123       uint i;
 124       for (i = 0; i < gs->info.num_outputs; i++) {
 125          if (gs->info.output_semantic_name[i] == TGSI_SEMANTIC_POSITION &&
 126              gs->info.output_semantic_index[i] == 0)
 127             gs->position_output = i;
 128       }
 129    }
 130
 131    return gs;
 132 }
 133
 134 void draw_bind_geometry_shader(struct draw_context *draw,
 135                                struct draw_geometry_shader *dgs)
 136 {
 137    draw_do_flush(draw, DRAW_FLUSH_STATE_CHANGE);
 138
 139    if (dgs) {
 140       draw->gs.geometry_shader = dgs;
 141       draw->gs.num_gs_outputs = dgs->info.num_outputs;
 142       draw->gs.position_output = dgs->position_output;
 143       draw_geometry_shader_prepare(dgs, draw);
 144    }
 145    else {
 146       draw->gs.geometry_shader = NULL;
 147       draw->gs.num_gs_outputs = 0;
 148    }
 149 }
 150
 151 void draw_delete_geometry_shader(struct draw_context *draw,
 152                                  struct draw_geometry_shader *dgs)
 153 {
 154    FREE(dgs);
 155 }
 156
 157 static INLINE int num_vertices_for_prim(int prim)
 158 {
 159    switch(prim) {
 160    case PIPE_PRIM_POINTS:
 161       return 1;
 162    case PIPE_PRIM_LINES:
 163       return 2;
 164    case PIPE_PRIM_LINE_LOOP:
 165       return 2;
 166    case PIPE_PRIM_LINE_STRIP:
 167       return 2;
 168    case PIPE_PRIM_TRIANGLES:
 169       return 3;
 170    case PIPE_PRIM_TRIANGLE_STRIP:
 171       return 3;
 172    case PIPE_PRIM_TRIANGLE_FAN:
 173       return 3;
 174    case PIPE_PRIM_LINES_ADJACENCY:
 175    case PIPE_PRIM_LINE_STRIP_ADJACENCY:
 176       return 4;
 177    case PIPE_PRIM_TRIANGLES_ADJACENCY:
 178    case PIPE_PRIM_TRIANGLE_STRIP_ADJACENCY:
 179       return 6;
 180    default:
 181       assert(!"Bad geometry shader input");
 182       return 0;
 183    }
 184 }
 185
 186 static void draw_fetch_geometry_input(struct draw_geometry_shader *shader,
 187                                       int start_primitive,
 188                                       int num_primitives,
 189                                       const float (*input_ptr)[4],
 190                                       unsigned input_vertex_stride,
 191                                       unsigned inputs_from_vs)
 192 {
 193    struct tgsi_exec_machine *machine = shader->machine;
 194    unsigned slot, vs_slot, k, j;
 195    unsigned num_vertices = num_vertices_for_prim(shader->input_primitive);
 196    int idx = 0;
 197
 198    for (slot = 0, vs_slot = 0; slot < shader->info.num_inputs; slot++) {
 199       /*debug_printf("Slot = %d (semantic = %d)\n", slot,
 200         shader->info.input_semantic_name[slot]);*/
 201       if (shader->info.input_semantic_name[slot] ==
 202           TGSI_SEMANTIC_PRIMID) {
 203          for (j = 0; j < num_primitives; ++j) {
 204             machine->Inputs[idx].xyzw[0].f[j] = (float)start_primitive + j;
 205             machine->Inputs[idx].xyzw[1].f[j] = (float)start_primitive + j;
 206             machine->Inputs[idx].xyzw[2].f[j] = (float)start_primitive + j;
 207             machine->Inputs[idx].xyzw[3].f[j] = (float)start_primitive + j;
 208          }
 209          ++idx;
 210       } else {
 211          for (j = 0; j < num_primitives; ++j) {
 212             int vidx = idx;
 213             const float (*prim_ptr)[4];
 214             /*debug_printf("    %d) Prim (num_verts = %d)\n", start_primitive + j,
 215               num_vertices);*/
 216             prim_ptr = (const float (*)[4])(
 217                (const char *)input_ptr +
 218                (j * num_vertices * input_vertex_stride));
 219
 220             for (k = 0; k < num_vertices; ++k, ++vidx) {
 221                const float (*input)[4];
 222                input = (const float (*)[4])(
 223                   (const char *)prim_ptr + (k * input_vertex_stride));
 224                vidx = k * TGSI_EXEC_MAX_INPUT_ATTRIBS + slot;
 225                /*debug_printf("\t%d)(%d) Input vert:\n", vidx, k);*/
 226 #if 1
 227                assert(!util_is_inf_or_nan(input[vs_slot][0]));
 228                assert(!util_is_inf_or_nan(input[vs_slot][1]));
 229                assert(!util_is_inf_or_nan(input[vs_slot][2]));
 230                assert(!util_is_inf_or_nan(input[vs_slot][3]));
 231 #endif
 232                machine->Inputs[vidx].xyzw[0].f[j] = input[vs_slot][0];
 233                machine->Inputs[vidx].xyzw[1].f[j] = input[vs_slot][1];
 234                machine->Inputs[vidx].xyzw[2].f[j] = input[vs_slot][2];
 235                machine->Inputs[vidx].xyzw[3].f[j] = input[vs_slot][3];
 236 #if 0
 237                debug_printf("\t\t%d %f %f %f %f\n", slot,
 238                             machine->Inputs[vidx].xyzw[0].f[j],
 239                             machine->Inputs[vidx].xyzw[1].f[j],
 240                             machine->Inputs[vidx].xyzw[2].f[j],
 241                             machine->Inputs[vidx].xyzw[3].f[j]);
 242 #endif
 243             }
 244          }
 245          ++vs_slot;
 246          idx += num_vertices;
 247       }
 248    }
 249 }
 250
 251 static INLINE void
 252 draw_geometry_fetch_outputs(struct draw_geometry_shader *shader,
 253                             int num_primitives,
 254                             float (*output)[4],
 255                             unsigned vertex_size)
 256 {
 257    struct tgsi_exec_machine *machine = shader->machine;
 258    unsigned prim_idx, j, slot;
 259
 260    /* Unswizzle all output results.
 261     */
 262    /* FIXME: handle all the primitives produced by the gs, not just
 263     * the first one
 264     unsigned prim_count =
 265     mach->Temps[TEMP_PRIMITIVE_I].xyzw[TEMP_PRIMITIVE_C].u[0];*/
 266    for (prim_idx = 0; prim_idx < num_primitives; ++prim_idx) {
 267       unsigned num_verts_per_prim = machine->Primitives[0];
 268       for (j = 0; j < num_verts_per_prim; j++) {
 269          int idx = (prim_idx * num_verts_per_prim + j) *
 270                    shader->info.num_outputs;
 271 #ifdef DEBUG_OUTPUTS
 272          debug_printf("%d) Output vert:\n", idx);
 273 #endif
 274          for (slot = 0; slot < shader->info.num_outputs; slot++) {
 275             output[slot][0] = machine->Outputs[idx + slot].xyzw[0].f[prim_idx];
 276             output[slot][1] = machine->Outputs[idx + slot].xyzw[1].f[prim_idx];
 277             output[slot][2] = machine->Outputs[idx + slot].xyzw[2].f[prim_idx];
 278             output[slot][3] = machine->Outputs[idx + slot].xyzw[3].f[prim_idx];
 279 #ifdef DEBUG_OUTPUTS
 280             debug_printf("\t%d: %f %f %f %f\n", slot,
 281                          output[slot][0],
 282                          output[slot][1],
 283                          output[slot][2],
 284                          output[slot][3]);
 285 #endif
 286             debug_assert(!util_is_inf_or_nan(output[slot][0]));
 287          }
 288          output = (float (*)[4])((char *)output + vertex_size);
 289       }
 290    }
 291 }
 292
 293 void draw_geometry_shader_run(struct draw_geometry_shader *shader,
 294                               const float (*input)[4],
 295                               float (*output)[4],
 296                               const void *constants[PIPE_MAX_CONSTANT_BUFFERS],
 297                               unsigned count,
 298                               unsigned input_stride,
 299                               unsigned vertex_size)
 300 {
 301    struct tgsi_exec_machine *machine = shader->machine;
 302    unsigned int i;
 303    unsigned num_vertices = num_vertices_for_prim(shader->input_primitive);
 304    unsigned num_primitives = count/num_vertices;
 305    unsigned inputs_from_vs = 0;
 306
 307    for (i = 0; i < PIPE_MAX_CONSTANT_BUFFERS; i++) {
 308       machine->Consts[i] = constants[i];
 309    }
 310
 311    for (i = 0; i < shader->info.num_inputs; ++i) {
 312       if (shader->info.input_semantic_name[i] != TGSI_SEMANTIC_PRIMID)
 313          ++inputs_from_vs;
 314    }
 315
 316    for (i = 0; i < num_primitives; ++i) {
 317       unsigned int max_primitives = 1;
 318
 319       draw_fetch_geometry_input(shader, i, max_primitives, input,
 320                                 input_stride, inputs_from_vs);
 321
 322       tgsi_set_exec_mask(machine,
 323                          1,
 324                          max_primitives > 1,
 325                          max_primitives > 2,
 326                          max_primitives > 3);
 327
 328       /* run interpreter */
 329       tgsi_exec_machine_run(machine);
 330
 331       draw_geometry_fetch_outputs(shader, max_primitives,
 332                                   output, vertex_size);
 333    }
 334 }
 335
 336 void draw_geometry_shader_delete(struct draw_geometry_shader *shader)
 337 {
 338    FREE((void*) shader->state.tokens);
 339    FREE(shader);
 340 }
 341
 342 void draw_geometry_shader_prepare(struct draw_geometry_shader *shader,
 343                                   struct draw_context *draw)
 344 {
 345    if (shader && shader->machine->Tokens != shader->state.tokens) {
 346       tgsi_exec_machine_bind_shader(shader->machine,
 347                                     shader->state.tokens,
 348                                     draw->gs.num_samplers,
 349                                     draw->gs.samplers);
 350    }
 351 }