src/gallium/auxiliary/draw/draw_private.h

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 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  * Private data structures, etc for the draw module.
  30  */
  31
  32
  33 /**
  34  * Authors:
  35  * Keith Whitwell <keithw@vmware.com>
  36  * Brian Paul
  37  */
  38
  39
  40 #ifndef DRAW_PRIVATE_H
  41 #define DRAW_PRIVATE_H
  42
  43
  44 #include "pipe/p_state.h"
  45 #include "pipe/p_defines.h"
  46
  47 #include "tgsi/tgsi_scan.h"
  48
  49 #ifdef HAVE_LLVM
  50 struct gallivm_state;
  51 #endif
  52
  53
  54 /** Sum of frustum planes and user-defined planes */
  55 #define DRAW_TOTAL_CLIP_PLANES (6 + PIPE_MAX_CLIP_PLANES)
  56
  57 /**
  58  * The largest possible index of a vertex that can be fetched.
  59  */
  60 #define DRAW_MAX_FETCH_IDX 0xffffffff
  61
  62 struct pipe_context;
  63 struct draw_vertex_shader;
  64 struct draw_context;
  65 struct draw_stage;
  66 struct vbuf_render;
  67 struct tgsi_exec_machine;
  68 struct tgsi_sampler;
  69 struct tgsi_image;
  70 struct draw_pt_front_end;
  71 struct draw_assembler;
  72 struct draw_llvm;
  73
  74
  75 /**
  76  * Represents the mapped vertex buffer.
  77  */
  78 struct draw_vertex_buffer {
  79    const void *map;
  80    uint32_t size;
  81 };
  82
  83 /**
  84  * Basic vertex info.
  85  * Carry some useful information around with the vertices in the prim pipe.
  86  */
  87 struct vertex_header {
  88    unsigned clipmask:DRAW_TOTAL_CLIP_PLANES;
  89    unsigned edgeflag:1;
  90    unsigned pad:1;
  91    unsigned vertex_id:16;
  92
  93    float clip_pos[4];
  94
  95    /* This will probably become float (*data)[4] soon:
  96     */
  97    float data[][4];
  98 };
  99
 100 /* NOTE: It should match vertex_id size above */
 101 #define UNDEFINED_VERTEX_ID 0xffff
 102
 103
 104 /* maximum number of shader variants we can cache */
 105 #define DRAW_MAX_SHADER_VARIANTS 128
 106
 107 /**
 108  * Private context for the drawing module.
 109  */
 110 struct draw_context
 111 {
 112    struct pipe_context *pipe;
 113
 114    /** Drawing/primitive pipeline stages */
 115    struct {
 116       struct draw_stage *first;  /**< one of the following */
 117
 118       struct draw_stage *validate;
 119
 120       /* stages (in logical order) */
 121       struct draw_stage *flatshade;
 122       struct draw_stage *clip;
 123       struct draw_stage *cull;
 124       struct draw_stage *twoside;
 125       struct draw_stage *offset;
 126       struct draw_stage *unfilled;
 127       struct draw_stage *stipple;
 128       struct draw_stage *aapoint;
 129       struct draw_stage *aaline;
 130       struct draw_stage *pstipple;
 131       struct draw_stage *wide_line;
 132       struct draw_stage *wide_point;
 133       struct draw_stage *rasterize;
 134
 135       float wide_point_threshold; /**< convert pnts to tris if larger than this */
 136       float wide_line_threshold;  /**< convert lines to tris if wider than this */
 137       boolean wide_point_sprites; /**< convert points to tris for sprite mode */
 138       boolean line_stipple;       /**< do line stipple? */
 139       boolean point_sprite;       /**< convert points to quads for sprites? */
 140
 141       /* Temporary storage while the pipeline is being run:
 142        */
 143       char *verts;
 144       unsigned vertex_stride;
 145       unsigned vertex_count;
 146    } pipeline;
 147
 148
 149    struct vbuf_render *render;
 150
 151    /* Support prototype passthrough path:
 152     */
 153    struct {
 154       /* Current active frontend */
 155       struct draw_pt_front_end *frontend;
 156       unsigned prim;
 157       unsigned opt;     /**< bitmask of PT_x flags */
 158       unsigned eltSize; /* saved eltSize for flushing */
 159
 160       boolean rebind_parameters;
 161
 162       struct {
 163          struct draw_pt_middle_end *fetch_emit;
 164          struct draw_pt_middle_end *fetch_shade_emit;
 165          struct draw_pt_middle_end *general;
 166          struct draw_pt_middle_end *llvm;
 167       } middle;
 168
 169       struct {
 170          struct draw_pt_front_end *vsplit;
 171       } front;
 172
 173       struct pipe_vertex_buffer vertex_buffer[PIPE_MAX_ATTRIBS];
 174       unsigned nr_vertex_buffers;
 175
 176       /*
 177        * This is the largest legal index value for the current set of
 178        * bound vertex buffers.  Regardless of any other consideration,
 179        * all vertex lookups need to be clamped to 0..max_index to
 180        * prevent out-of-bound access.
 181        */
 182       unsigned max_index;
 183
 184       struct pipe_vertex_element vertex_element[PIPE_MAX_ATTRIBS];
 185       unsigned nr_vertex_elements;
 186
 187       /* user-space vertex data, buffers */
 188       struct {
 189          /** vertex element/index buffer (ex: glDrawElements) */
 190          const void *elts;
 191          /** bytes per index (0, 1, 2 or 4) */
 192          unsigned eltSizeIB;
 193          unsigned eltSize;
 194          unsigned eltMax;
 195          int eltBias;
 196          unsigned min_index;
 197          unsigned max_index;
 198
 199          /** vertex arrays */
 200          struct draw_vertex_buffer vbuffer[PIPE_MAX_ATTRIBS];
 201
 202          /** constant buffers (for vertex/geometry shader) */
 203          const void *vs_constants[PIPE_MAX_CONSTANT_BUFFERS];
 204          unsigned vs_constants_size[PIPE_MAX_CONSTANT_BUFFERS];
 205          const void *gs_constants[PIPE_MAX_CONSTANT_BUFFERS];
 206          unsigned gs_constants_size[PIPE_MAX_CONSTANT_BUFFERS];
 207
 208          /* pointer to planes */
 209          float (*planes)[DRAW_TOTAL_CLIP_PLANES][4];
 210       } user;
 211
 212       boolean test_fse;         /* enable FSE even though its not correct (eg for softpipe) */
 213       boolean no_fse;           /* disable FSE even when it is correct */
 214    } pt;
 215
 216    struct {
 217       boolean bypass_clip_xy;
 218       boolean bypass_clip_z;
 219       boolean guard_band_xy;
 220       boolean bypass_clip_points;
 221    } driver;
 222
 223    boolean quads_always_flatshade_last;
 224
 225    boolean flushing;         /**< debugging/sanity */
 226    boolean suspend_flushing; /**< internally set */
 227
 228    /* Flags set if API requires clipping in these planes and the
 229     * driver doesn't indicate that it can do it for us.
 230     */
 231    boolean clip_xy;
 232    boolean clip_z;
 233    boolean clip_user;
 234    boolean guard_band_xy;
 235    boolean guard_band_points_xy;
 236
 237    boolean force_passthrough; /**< never clip or shade */
 238
 239    boolean dump_vs;
 240
 241    /** Depth format and bias related settings. */
 242    boolean floating_point_depth;
 243    double mrd;  /**< minimum resolvable depth value, for polygon offset */
 244
 245    /** Current rasterizer state given to us by the driver */
 246    const struct pipe_rasterizer_state *rasterizer;
 247    /** Driver CSO handle for the current rasterizer state */
 248    void *rast_handle;
 249
 250    /** Rasterizer CSOs without culling/stipple/etc */
 251    void *rasterizer_no_cull[2][2];
 252
 253    struct pipe_viewport_state viewports[PIPE_MAX_VIEWPORTS];
 254    boolean identity_viewport;
 255    boolean bypass_viewport;
 256
 257    /** Vertex shader state */
 258    struct {
 259       struct draw_vertex_shader *vertex_shader;
 260       uint num_vs_outputs;  /**< convenience, from vertex_shader */
 261       uint position_output;
 262       uint edgeflag_output;
 263       uint clipvertex_output;
 264       uint clipdistance_output[2];
 265
 266       /** Fields for TGSI interpreter / execution */
 267       struct {
 268          struct tgsi_exec_machine *machine;
 269
 270          struct tgsi_sampler *sampler;
 271          struct tgsi_image *image;
 272       } tgsi;
 273
 274       struct translate *fetch;
 275       struct translate_cache *fetch_cache;
 276       struct translate *emit;
 277       struct translate_cache *emit_cache;
 278    } vs;
 279
 280    /** Geometry shader state */
 281    struct {
 282       struct draw_geometry_shader *geometry_shader;
 283       uint num_gs_outputs;  /**< convenience, from geometry_shader */
 284       uint position_output;
 285
 286       /** Fields for TGSI interpreter / execution */
 287       struct {
 288          struct tgsi_exec_machine *machine;
 289
 290          struct tgsi_sampler *sampler;
 291          struct tgsi_image *image;
 292       } tgsi;
 293
 294    } gs;
 295
 296    /** Fragment shader state */
 297    struct {
 298       struct draw_fragment_shader *fragment_shader;
 299    } fs;
 300
 301    /** Stream output (vertex feedback) state */
 302    struct {
 303       struct draw_so_target *targets[PIPE_MAX_SO_BUFFERS];
 304       uint num_targets;
 305    } so;
 306
 307    /* Clip derived state:
 308     */
 309    float plane[DRAW_TOTAL_CLIP_PLANES][4];
 310
 311    /* If a prim stage introduces new vertex attributes, they'll be stored here
 312     */
 313    struct {
 314       uint num;
 315       uint semantic_name[10];
 316       uint semantic_index[10];
 317       uint slot[10];
 318    } extra_shader_outputs;
 319
 320    unsigned instance_id;
 321    unsigned start_instance;
 322    unsigned start_index;
 323
 324    struct draw_llvm *llvm;
 325
 326    /** Texture sampler and sampler view state.
 327     * Note that we have arrays indexed by shader type.  At this time
 328     * we only handle vertex and geometry shaders in the draw module, but
 329     * there may be more in the future (ex: hull and tessellation).
 330     */
 331    struct pipe_sampler_view *sampler_views[PIPE_SHADER_TYPES][PIPE_MAX_SHADER_SAMPLER_VIEWS];
 332    unsigned num_sampler_views[PIPE_SHADER_TYPES];
 333    const struct pipe_sampler_state *samplers[PIPE_SHADER_TYPES][PIPE_MAX_SAMPLERS];
 334    unsigned num_samplers[PIPE_SHADER_TYPES];
 335
 336    struct pipe_query_data_pipeline_statistics statistics;
 337    boolean collect_statistics;
 338
 339    struct draw_assembler *ia;
 340
 341    void *driver_private;
 342 };
 343
 344
 345 struct draw_fetch_info {
 346    boolean linear;
 347    unsigned start;
 348    const unsigned *elts;
 349    unsigned count;
 350 };
 351
 352 struct draw_vertex_info {
 353    struct vertex_header *verts;
 354    unsigned vertex_size;
 355    unsigned stride;
 356    unsigned count;
 357 };
 358
 359 /* these flags are set if the primitive is a segment of a larger one */
 360 #define DRAW_SPLIT_BEFORE        0x1
 361 #define DRAW_SPLIT_AFTER         0x2
 362 #define DRAW_LINE_LOOP_AS_STRIP  0x4
 363
 364 struct draw_prim_info {
 365    boolean linear;
 366    unsigned start;
 367
 368    const ushort *elts;
 369    unsigned count;
 370
 371    unsigned prim;
 372    unsigned flags;
 373    unsigned *primitive_lengths;
 374    unsigned primitive_count;
 375 };
 376
 377
 378 /*******************************************************************************
 379  * Draw common initialization code
 380  */
 381 boolean draw_init(struct draw_context *draw);
 382 void draw_new_instance(struct draw_context *draw);
 383
 384 /*******************************************************************************
 385  * Vertex shader code:
 386  */
 387 boolean draw_vs_init( struct draw_context *draw );
 388 void draw_vs_destroy( struct draw_context *draw );
 389
 390
 391 /*******************************************************************************
 392  * Geometry shading code:
 393  */
 394 boolean draw_gs_init( struct draw_context *draw );
 395
 396
 397 void draw_gs_destroy( struct draw_context *draw );
 398
 399 /*******************************************************************************
 400  * Common shading code:
 401  */
 402 uint draw_current_shader_outputs(const struct draw_context *draw);
 403 uint draw_current_shader_position_output(const struct draw_context *draw);
 404 uint draw_current_shader_viewport_index_output(const struct draw_context *draw);
 405 uint draw_current_shader_clipvertex_output(const struct draw_context *draw);
 406 uint draw_current_shader_clipdistance_output(const struct draw_context *draw, int index);
 407 uint draw_current_shader_num_written_clipdistances(const struct draw_context *draw);
 408 uint draw_current_shader_culldistance_output(const struct draw_context *draw, int index);
 409 uint draw_current_shader_num_written_culldistances(const struct draw_context *draw);
 410 int draw_alloc_extra_vertex_attrib(struct draw_context *draw,
 411                                    uint semantic_name, uint semantic_index);
 412 void draw_remove_extra_vertex_attribs(struct draw_context *draw);
 413 boolean draw_current_shader_uses_viewport_index(
 414    const struct draw_context *draw);
 415
 416
 417 /*******************************************************************************
 418  * Vertex processing (was passthrough) code:
 419  */
 420 boolean draw_pt_init( struct draw_context *draw );
 421 void draw_pt_destroy( struct draw_context *draw );
 422 void draw_pt_reset_vertex_ids( struct draw_context *draw );
 423 void draw_pt_flush( struct draw_context *draw, unsigned flags );
 424
 425
 426 /*******************************************************************************
 427  * Primitive processing (pipeline) code:
 428  */
 429
 430 boolean draw_pipeline_init( struct draw_context *draw );
 431 void draw_pipeline_destroy( struct draw_context *draw );
 432
 433
 434
 435
 436
 437 /*
 438  * These flags are used by the pipeline when unfilled and/or line stipple modes
 439  * are operational.
 440  */
 441 #define DRAW_PIPE_EDGE_FLAG_0   0x1
 442 #define DRAW_PIPE_EDGE_FLAG_1   0x2
 443 #define DRAW_PIPE_EDGE_FLAG_2   0x4
 444 #define DRAW_PIPE_EDGE_FLAG_ALL 0x7
 445 #define DRAW_PIPE_RESET_STIPPLE 0x8
 446
 447 void draw_pipeline_run( struct draw_context *draw,
 448                         const struct draw_vertex_info *vert,
 449                         const struct draw_prim_info *prim);
 450
 451 void draw_pipeline_run_linear( struct draw_context *draw,
 452                                const struct draw_vertex_info *vert,
 453                                const struct draw_prim_info *prim);
 454
 455
 456
 457
 458 void draw_pipeline_flush( struct draw_context *draw,
 459                           unsigned flags );
 460
 461
 462
 463 /*******************************************************************************
 464  * Flushing
 465  */
 466
 467 #define DRAW_FLUSH_PARAMETER_CHANGE 0x1  /**< Constants, viewport, etc */
 468 #define DRAW_FLUSH_STATE_CHANGE     0x2  /**< Other/heavy state changes */
 469 #define DRAW_FLUSH_BACKEND          0x4  /**< Flush the output buffer */
 470
 471
 472 void draw_do_flush( struct draw_context *draw, unsigned flags );
 473
 474
 475
 476 void *
 477 draw_get_rasterizer_no_cull( struct draw_context *draw,
 478                              boolean scissor,
 479                              boolean flatshade );
 480
 481 void
 482 draw_stats_clipper_primitives(struct draw_context *draw,
 483                               const struct draw_prim_info *prim_info);
 484
 485 void draw_update_clip_flags(struct draw_context *draw);
 486 void draw_update_viewport_flags(struct draw_context *draw);
 487
 488 /**
 489  * Return index i from the index buffer.
 490  * If the index buffer would overflow we return the
 491  * maximum possible index.
 492  */
 493 #define DRAW_GET_IDX(_elts, _i)                   \
 494    (((_i) >= draw->pt.user.eltMax) ? DRAW_MAX_FETCH_IDX : (_elts)[_i])
 495
 496 /**
 497  * Return index of the given viewport clamping it
 498  * to be between 0 <= and < PIPE_MAX_VIEWPORTS
 499  */
 500 static inline unsigned
 501 draw_clamp_viewport_idx(int idx)
 502 {
 503    return ((PIPE_MAX_VIEWPORTS > idx && idx >= 0) ? idx : 0);
 504 }
 505
 506 /**
 507  * Adds two unsigned integers and if the addition
 508  * overflows then it returns the value from
 509  * the overflow_value variable.
 510  */
 511 static inline unsigned
 512 draw_overflow_uadd(unsigned a, unsigned b,
 513                    unsigned overflow_value)
 514 {
 515    unsigned res = a + b;
 516    if (res < a || res < b) {
 517       res = overflow_value;
 518    }
 519    return res;
 520 }
 521
 522 #endif /* DRAW_PRIVATE_H */