src/gallium/auxiliary/draw/draw_pipe_pstipple.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2008 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 VMWARE 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 /**
  29  * Polygon stipple stage:  implement polygon stipple with texture map and
  30  * fragment program.  The fragment program samples the texture using the
  31  * fragment window coordinate register and does a fragment kill for the
  32  * stipple-failing fragments.
  33  *
  34  * Authors:  Brian Paul
  35  */
  36
  37
  38 #include "pipe/p_context.h"
  39 #include "pipe/p_defines.h"
  40 #include "pipe/p_shader_tokens.h"
  41 #include "util/u_inlines.h"
  42
  43 #include "util/u_format.h"
  44 #include "util/u_math.h"
  45 #include "util/u_memory.h"
  46 #include "util/u_pstipple.h"
  47 #include "util/u_sampler.h"
  48
  49 #include "tgsi/tgsi_transform.h"
  50
  51 #include "draw_context.h"
  52 #include "draw_pipe.h"
  53
  54
  55 /** Approx number of new tokens for instructions in pstip_transform_inst() */
  56 #define NUM_NEW_TOKENS 53
  57
  58
  59 /**
  60  * Subclass of pipe_shader_state to carry extra fragment shader info.
  61  */
  62 struct pstip_fragment_shader
  63 {
  64    struct pipe_shader_state state;
  65    void *driver_fs;
  66    void *pstip_fs;
  67    uint sampler_unit;
  68 };
  69
  70
  71 /**
  72  * Subclass of draw_stage
  73  */
  74 struct pstip_stage
  75 {
  76    struct draw_stage stage;
  77
  78    void *sampler_cso;
  79    struct pipe_resource *texture;
  80    struct pipe_sampler_view *sampler_view;
  81    uint num_samplers;
  82    uint num_sampler_views;
  83
  84    /*
  85     * Currently bound state
  86     */
  87    struct pstip_fragment_shader *fs;
  88    struct {
  89       void *samplers[PIPE_MAX_SAMPLERS];
  90       struct pipe_sampler_view *sampler_views[PIPE_MAX_SHADER_SAMPLER_VIEWS];
  91       const struct pipe_poly_stipple *stipple;
  92    } state;
  93
  94    /*
  95     * Driver interface/override functions
  96     */
  97    void * (*driver_create_fs_state)(struct pipe_context *,
  98                                     const struct pipe_shader_state *);
  99    void (*driver_bind_fs_state)(struct pipe_context *, void *);
 100    void (*driver_delete_fs_state)(struct pipe_context *, void *);
 101
 102    void (*driver_bind_sampler_states)(struct pipe_context *, unsigned,
 103                                       unsigned, unsigned, void **);
 104
 105    void (*driver_set_sampler_views)(struct pipe_context *,
 106                                     unsigned shader, unsigned start,
 107                                     unsigned count,
 108                                     struct pipe_sampler_view **);
 109
 110    void (*driver_set_polygon_stipple)(struct pipe_context *,
 111                                       const struct pipe_poly_stipple *);
 112
 113    struct pipe_context *pipe;
 114 };
 115
 116
 117 /**
 118  * Generate the frag shader we'll use for doing polygon stipple.
 119  * This will be the user's shader prefixed with a TEX and KIL instruction.
 120  */
 121 static boolean
 122 generate_pstip_fs(struct pstip_stage *pstip)
 123 {
 124    struct pipe_context *pipe = pstip->pipe;
 125    struct pipe_screen *screen = pipe->screen;
 126    const struct pipe_shader_state *orig_fs = &pstip->fs->state;
 127    /*struct draw_context *draw = pstip->stage.draw;*/
 128    struct pipe_shader_state pstip_fs;
 129    enum tgsi_file_type wincoord_file;
 130
 131    wincoord_file = screen->get_param(screen, PIPE_CAP_TGSI_FS_POSITION_IS_SYSVAL) ?
 132                    TGSI_FILE_SYSTEM_VALUE : TGSI_FILE_INPUT;
 133
 134    pstip_fs = *orig_fs; /* copy to init */
 135    pstip_fs.tokens = util_pstipple_create_fragment_shader(orig_fs->tokens,
 136                                                           &pstip->fs->sampler_unit,
 137                                                           0,
 138                                                           wincoord_file);
 139    if (pstip_fs.tokens == NULL)
 140       return FALSE;
 141
 142    assert(pstip->fs->sampler_unit < PIPE_MAX_SAMPLERS);
 143
 144    pstip->fs->pstip_fs = pstip->driver_create_fs_state(pipe, &pstip_fs);
 145
 146    FREE((void *)pstip_fs.tokens);
 147
 148    if (!pstip->fs->pstip_fs)
 149       return FALSE;
 150
 151    return TRUE;
 152 }
 153
 154
 155 /**
 156  * When we're about to draw our first stipple polygon in a batch, this function
 157  * is called to tell the driver to bind our modified fragment shader.
 158  */
 159 static boolean
 160 bind_pstip_fragment_shader(struct pstip_stage *pstip)
 161 {
 162    struct draw_context *draw = pstip->stage.draw;
 163    if (!pstip->fs->pstip_fs &&
 164        !generate_pstip_fs(pstip))
 165       return FALSE;
 166
 167    draw->suspend_flushing = TRUE;
 168    pstip->driver_bind_fs_state(pstip->pipe, pstip->fs->pstip_fs);
 169    draw->suspend_flushing = FALSE;
 170    return TRUE;
 171 }
 172
 173
 174 static inline struct pstip_stage *
 175 pstip_stage( struct draw_stage *stage )
 176 {
 177    return (struct pstip_stage *) stage;
 178 }
 179
 180
 181 static void
 182 pstip_first_tri(struct draw_stage *stage, struct prim_header *header)
 183 {
 184    struct pstip_stage *pstip = pstip_stage(stage);
 185    struct pipe_context *pipe = pstip->pipe;
 186    struct draw_context *draw = stage->draw;
 187    uint num_samplers;
 188    uint num_sampler_views;
 189
 190    assert(stage->draw->rasterizer->poly_stipple_enable);
 191
 192    /* bind our fragprog */
 193    if (!bind_pstip_fragment_shader(pstip)) {
 194       stage->tri = draw_pipe_passthrough_tri;
 195       stage->tri(stage, header);
 196       return;
 197    }
 198
 199
 200    /* how many samplers? */
 201    /* we'll use sampler/texture[pstip->sampler_unit] for the stipple */
 202    num_samplers = MAX2(pstip->num_samplers, pstip->fs->sampler_unit + 1);
 203    num_sampler_views = MAX2(pstip->num_sampler_views, num_samplers);
 204
 205    /* plug in our sampler, texture */
 206    pstip->state.samplers[pstip->fs->sampler_unit] = pstip->sampler_cso;
 207    pipe_sampler_view_reference(&pstip->state.sampler_views[pstip->fs->sampler_unit],
 208                                pstip->sampler_view);
 209
 210    assert(num_samplers <= PIPE_MAX_SAMPLERS);
 211
 212    draw->suspend_flushing = TRUE;
 213
 214    pstip->driver_bind_sampler_states(pipe, PIPE_SHADER_FRAGMENT, 0,
 215                                      num_samplers, pstip->state.samplers);
 216
 217    pstip->driver_set_sampler_views(pipe, PIPE_SHADER_FRAGMENT, 0,
 218                                    num_sampler_views, pstip->state.sampler_views);
 219
 220    draw->suspend_flushing = FALSE;
 221
 222    /* now really draw first triangle */
 223    stage->tri = draw_pipe_passthrough_tri;
 224    stage->tri(stage, header);
 225 }
 226
 227
 228 static void
 229 pstip_flush(struct draw_stage *stage, unsigned flags)
 230 {
 231    struct draw_context *draw = stage->draw;
 232    struct pstip_stage *pstip = pstip_stage(stage);
 233    struct pipe_context *pipe = pstip->pipe;
 234
 235    stage->tri = pstip_first_tri;
 236    stage->next->flush( stage->next, flags );
 237
 238    /* restore original frag shader, texture, sampler state */
 239    draw->suspend_flushing = TRUE;
 240    pstip->driver_bind_fs_state(pipe, pstip->fs ? pstip->fs->driver_fs : NULL);
 241
 242    pstip->driver_bind_sampler_states(pipe, PIPE_SHADER_FRAGMENT, 0,
 243                                      pstip->num_samplers,
 244                                      pstip->state.samplers);
 245
 246    pstip->driver_set_sampler_views(pipe, PIPE_SHADER_FRAGMENT, 0,
 247                                    pstip->num_sampler_views,
 248                                    pstip->state.sampler_views);
 249
 250    draw->suspend_flushing = FALSE;
 251 }
 252
 253
 254 static void
 255 pstip_reset_stipple_counter(struct draw_stage *stage)
 256 {
 257    stage->next->reset_stipple_counter( stage->next );
 258 }
 259
 260
 261 static void
 262 pstip_destroy(struct draw_stage *stage)
 263 {
 264    struct pstip_stage *pstip = pstip_stage(stage);
 265    uint i;
 266
 267    for (i = 0; i < PIPE_MAX_SHADER_SAMPLER_VIEWS; i++) {
 268       pipe_sampler_view_reference(&pstip->state.sampler_views[i], NULL);
 269    }
 270
 271    pstip->pipe->delete_sampler_state(pstip->pipe, pstip->sampler_cso);
 272
 273    pipe_resource_reference(&pstip->texture, NULL);
 274
 275    if (pstip->sampler_view) {
 276       pipe_sampler_view_reference(&pstip->sampler_view, NULL);
 277    }
 278
 279    draw_free_temp_verts( stage );
 280    FREE( stage );
 281 }
 282
 283
 284 /** Create a new polygon stipple drawing stage object */
 285 static struct pstip_stage *
 286 draw_pstip_stage(struct draw_context *draw, struct pipe_context *pipe)
 287 {
 288    struct pstip_stage *pstip = CALLOC_STRUCT(pstip_stage);
 289    if (!pstip)
 290       goto fail;
 291
 292    pstip->pipe = pipe;
 293
 294    pstip->stage.draw = draw;
 295    pstip->stage.name = "pstip";
 296    pstip->stage.next = NULL;
 297    pstip->stage.point = draw_pipe_passthrough_point;
 298    pstip->stage.line = draw_pipe_passthrough_line;
 299    pstip->stage.tri = pstip_first_tri;
 300    pstip->stage.flush = pstip_flush;
 301    pstip->stage.reset_stipple_counter = pstip_reset_stipple_counter;
 302    pstip->stage.destroy = pstip_destroy;
 303
 304    if (!draw_alloc_temp_verts( &pstip->stage, 8 ))
 305       goto fail;
 306
 307    return pstip;
 308
 309 fail:
 310    if (pstip)
 311       pstip->stage.destroy( &pstip->stage );
 312
 313    return NULL;
 314 }
 315
 316
 317 static struct pstip_stage *
 318 pstip_stage_from_pipe(struct pipe_context *pipe)
 319 {
 320    struct draw_context *draw = (struct draw_context *) pipe->draw;
 321    return pstip_stage(draw->pipeline.pstipple);
 322 }
 323
 324
 325 /**
 326  * This function overrides the driver's create_fs_state() function and
 327  * will typically be called by the state tracker.
 328  */
 329 static void *
 330 pstip_create_fs_state(struct pipe_context *pipe,
 331                        const struct pipe_shader_state *fs)
 332 {
 333    struct pstip_stage *pstip = pstip_stage_from_pipe(pipe);
 334    struct pstip_fragment_shader *pstipfs = CALLOC_STRUCT(pstip_fragment_shader);
 335
 336    if (pstipfs) {
 337       pstipfs->state.tokens = tgsi_dup_tokens(fs->tokens);
 338
 339       /* pass-through */
 340       pstipfs->driver_fs = pstip->driver_create_fs_state(pstip->pipe, fs);
 341    }
 342
 343    return pstipfs;
 344 }
 345
 346
 347 static void
 348 pstip_bind_fs_state(struct pipe_context *pipe, void *fs)
 349 {
 350    struct pstip_stage *pstip = pstip_stage_from_pipe(pipe);
 351    struct pstip_fragment_shader *pstipfs = (struct pstip_fragment_shader *) fs;
 352    /* save current */
 353    pstip->fs = pstipfs;
 354    /* pass-through */
 355    pstip->driver_bind_fs_state(pstip->pipe,
 356                                (pstipfs ? pstipfs->driver_fs : NULL));
 357 }
 358
 359
 360 static void
 361 pstip_delete_fs_state(struct pipe_context *pipe, void *fs)
 362 {
 363    struct pstip_stage *pstip = pstip_stage_from_pipe(pipe);
 364    struct pstip_fragment_shader *pstipfs = (struct pstip_fragment_shader *) fs;
 365    /* pass-through */
 366    pstip->driver_delete_fs_state(pstip->pipe, pstipfs->driver_fs);
 367
 368    if (pstipfs->pstip_fs)
 369       pstip->driver_delete_fs_state(pstip->pipe, pstipfs->pstip_fs);
 370
 371    FREE((void*)pstipfs->state.tokens);
 372    FREE(pstipfs);
 373 }
 374
 375
 376 static void
 377 pstip_bind_sampler_states(struct pipe_context *pipe, unsigned shader,
 378                           unsigned start, unsigned num, void **sampler)
 379 {
 380    struct pstip_stage *pstip = pstip_stage_from_pipe(pipe);
 381    uint i;
 382
 383    assert(start == 0);
 384
 385    if (shader == PIPE_SHADER_FRAGMENT) {
 386       /* save current */
 387       memcpy(pstip->state.samplers, sampler, num * sizeof(void *));
 388       for (i = num; i < PIPE_MAX_SAMPLERS; i++) {
 389          pstip->state.samplers[i] = NULL;
 390       }
 391       pstip->num_samplers = num;
 392    }
 393
 394    /* pass-through */
 395    pstip->driver_bind_sampler_states(pstip->pipe, shader, start, num, sampler);
 396 }
 397
 398
 399 static void
 400 pstip_set_sampler_views(struct pipe_context *pipe,
 401                         unsigned shader, unsigned start, unsigned num,
 402                         struct pipe_sampler_view **views)
 403 {
 404    struct pstip_stage *pstip = pstip_stage_from_pipe(pipe);
 405    uint i;
 406
 407    if (shader == PIPE_SHADER_FRAGMENT) {
 408       /* save current */
 409       for (i = 0; i < num; i++) {
 410          pipe_sampler_view_reference(&pstip->state.sampler_views[start + i],
 411                                      views[i]);
 412       }
 413       pstip->num_sampler_views = num;
 414    }
 415
 416    /* pass-through */
 417    pstip->driver_set_sampler_views(pstip->pipe, shader, start, num, views);
 418 }
 419
 420
 421 static void
 422 pstip_set_polygon_stipple(struct pipe_context *pipe,
 423                           const struct pipe_poly_stipple *stipple)
 424 {
 425    struct pstip_stage *pstip = pstip_stage_from_pipe(pipe);
 426
 427    /* save current */
 428    pstip->state.stipple = stipple;
 429
 430    /* pass-through */
 431    pstip->driver_set_polygon_stipple(pstip->pipe, stipple);
 432
 433    util_pstipple_update_stipple_texture(pstip->pipe, pstip->texture,
 434                                         pstip->state.stipple->stipple);
 435 }
 436
 437
 438 /**
 439  * Called by drivers that want to install this polygon stipple stage
 440  * into the draw module's pipeline.  This will not be used if the
 441  * hardware has native support for polygon stipple.
 442  */
 443 boolean
 444 draw_install_pstipple_stage(struct draw_context *draw,
 445                             struct pipe_context *pipe)
 446 {
 447    struct pstip_stage *pstip;
 448
 449    pipe->draw = (void *) draw;
 450
 451    /*
 452     * Create / install pgon stipple drawing / prim stage
 453     */
 454    pstip = draw_pstip_stage( draw, pipe );
 455    if (!pstip)
 456       goto fail;
 457
 458    draw->pipeline.pstipple = &pstip->stage;
 459
 460    /* save original driver functions */
 461    pstip->driver_create_fs_state = pipe->create_fs_state;
 462    pstip->driver_bind_fs_state = pipe->bind_fs_state;
 463    pstip->driver_delete_fs_state = pipe->delete_fs_state;
 464
 465    pstip->driver_bind_sampler_states = pipe->bind_sampler_states;
 466    pstip->driver_set_sampler_views = pipe->set_sampler_views;
 467    pstip->driver_set_polygon_stipple = pipe->set_polygon_stipple;
 468
 469    /* create special texture, sampler state */
 470    pstip->texture = util_pstipple_create_stipple_texture(pipe, NULL);
 471    if (!pstip->texture)
 472       goto fail;
 473
 474    pstip->sampler_view = util_pstipple_create_sampler_view(pipe,
 475                                                            pstip->texture);
 476    if (!pstip->sampler_view)
 477       goto fail;
 478
 479    pstip->sampler_cso = util_pstipple_create_sampler(pipe);
 480    if (!pstip->sampler_cso)
 481       goto fail;
 482
 483    /* override the driver's functions */
 484    pipe->create_fs_state = pstip_create_fs_state;
 485    pipe->bind_fs_state = pstip_bind_fs_state;
 486    pipe->delete_fs_state = pstip_delete_fs_state;
 487
 488    pipe->bind_sampler_states = pstip_bind_sampler_states;
 489    pipe->set_sampler_views = pstip_set_sampler_views;
 490    pipe->set_polygon_stipple = pstip_set_polygon_stipple;
 491
 492    return TRUE;
 493
 494  fail:
 495    if (pstip)
 496       pstip->stage.destroy( &pstip->stage );
 497
 498    return FALSE;
 499 }