src/mesa/tnl/t_context.h

   1 /*
   2  * mesa 3-D graphics library
   3  * Version:  6.5
   4  *
   5  * Copyright (C) 1999-2006  Brian Paul   All Rights Reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the "Software"),
   9  * to deal in the Software without restriction, including without limitation
  10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  11  * and/or sell copies of the Software, and to permit persons to whom the
  12  * Software is furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included
  15  * in all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  21  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  22  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  23  */
  24
  25 /**
  26  * \file t_context.h
  27  * \brief TnL module datatypes and definitions.
  28  * \author Keith Whitwell
  29  */
  30
  31
  32 /**
  33  * \mainpage The TNL-module
  34  *
  35  * TNL stands for "transform and lighting", i.e. this module implements
  36  * a pipeline that receives as input a buffer of vertices and does all
  37  * necessary transformations (rotations, clipping, vertex shader etc.)
  38  * and passes then the output to the rasterizer.
  39  *
  40  * The tnl_pipeline contains the array of all stages, which should be
  41  * applied. Each stage is a black-box, which is described by an
  42  * tnl_pipeline_stage. The function ::_tnl_run_pipeline applies all the
  43  * stages to the vertex_buffer TNLcontext::vb, where the vertex data
  44  * is stored. The last stage in the pipeline is the rasterizer.
  45  *
  46  * The initial vertex_buffer data may either come from an ::immediate
  47  * structure or client vertex_arrays or display lists:
  48  *
  49  *
  50  * - The ::immediate structure records all the GL commands issued between
  51  * glBegin and glEnd.  \n
  52  * The structure accumulates data, until it is either full or it is
  53  * flushed (usually by a state change). Before starting then the pipeline,
  54  * the collected vertex data in ::immediate has to be pushed into
  55  * TNLcontext::vb.
  56  * This happens in ::_tnl_vb_bind_immediate. The pipeline is then run by
  57  * calling tnl_device_driver::RunPipeline = ::_tnl_run_pipeline, which
  58  * is stored in TNLcontext::Driver.   \n
  59  * An ::immediate does (for performance reasons) usually not finish with a
  60  * glEnd, and hence it also does not need to start with a glBegin.
  61  * This means that the last vertices of one ::immediate may need to be
  62  * saved for the next one.
  63  *
  64  *
  65  * - NOT SURE ABOUT THIS: The vertex_arrays structure is used to handle
  66  * glDrawArrays etc.  \n
  67  * Here, the data of the vertex_arrays is copied by ::_tnl_vb_bind_arrays
  68  * into TNLcontext::vb, so that the pipeline can be started.
  69  */
  70
  71
  72 #ifndef _T_CONTEXT_H
  73 #define _T_CONTEXT_H
  74
  75 #include "glheader.h"
  76 #include "mtypes.h"
  77
  78 #include "math/m_matrix.h"
  79 #include "math/m_vector.h"
  80 #include "math/m_xform.h"
  81
  82
  83 #define MAX_PIPELINE_STAGES     30
  84
  85 /*
  86  * Note: The first attributes match the VERT_ATTRIB_* definitions
  87  * in mtypes.h.  However, the tnl module has additional attributes
  88  * for materials, color indexes, edge flags, etc.
  89  */
  90 /* Although it's nice to use these as bit indexes in a DWORD flag, we
  91  * could manage without if necessary.  Another limit currently is the
  92  * number of bits allocated for these numbers in places like vertex
  93  * program instruction formats and register layouts.
  94  */
  95 /* The bit space exhaustion is a fact now, done by _TNL_ATTRIB_ATTRIBUTE* for
  96  * GLSL vertex shader which cannot be aliased with conventional vertex attribs.
  97  * Compacting _TNL_ATTRIB_MAT_* attribs would not work, they would not give
  98  * as many free bits (11 plus already 1 free bit) as _TNL_ATTRIB_ATTRIBUTE*
  99  * attribs want (16).
 100  */
 101 enum {
 102         _TNL_ATTRIB_POS = 0,
 103         _TNL_ATTRIB_WEIGHT = 1,
 104         _TNL_ATTRIB_NORMAL = 2,
 105         _TNL_ATTRIB_COLOR0 = 3,
 106         _TNL_ATTRIB_COLOR1 = 4,
 107         _TNL_ATTRIB_FOG = 5,
 108         _TNL_ATTRIB_COLOR_INDEX = 6,
 109         _TNL_ATTRIB_SEVEN = 7,
 110         _TNL_ATTRIB_TEX0 = 8,
 111         _TNL_ATTRIB_TEX1 = 9,
 112         _TNL_ATTRIB_TEX2 = 10,
 113         _TNL_ATTRIB_TEX3 = 11,
 114         _TNL_ATTRIB_TEX4 = 12,
 115         _TNL_ATTRIB_TEX5 = 13,
 116         _TNL_ATTRIB_TEX6 = 14,
 117         _TNL_ATTRIB_TEX7 = 15,
 118         _TNL_ATTRIB_GENERIC0 = 16,
 119         _TNL_ATTRIB_GENERIC1 = 17,
 120         _TNL_ATTRIB_GENERIC2 = 18,
 121         _TNL_ATTRIB_GENERIC3 = 19,
 122         _TNL_ATTRIB_GENERIC4 = 20,
 123         _TNL_ATTRIB_GENERIC5 = 21,
 124         _TNL_ATTRIB_GENERIC6 = 22,
 125         _TNL_ATTRIB_GENERIC7 = 23,
 126         _TNL_ATTRIB_GENERIC8 = 24,
 127         _TNL_ATTRIB_GENERIC9 = 25,
 128         _TNL_ATTRIB_GENERIC10 = 26,
 129         _TNL_ATTRIB_GENERIC11 = 27,
 130         _TNL_ATTRIB_GENERIC12 = 28,
 131         _TNL_ATTRIB_GENERIC13 = 29,
 132         _TNL_ATTRIB_GENERIC14 = 30,
 133         _TNL_ATTRIB_GENERIC15 = 31,
 134         _TNL_ATTRIB_MAT_FRONT_AMBIENT = 32,
 135         _TNL_ATTRIB_MAT_BACK_AMBIENT = 33,
 136         _TNL_ATTRIB_MAT_FRONT_DIFFUSE = 34,
 137         _TNL_ATTRIB_MAT_BACK_DIFFUSE = 35,
 138         _TNL_ATTRIB_MAT_FRONT_SPECULAR = 36,
 139         _TNL_ATTRIB_MAT_BACK_SPECULAR = 37,
 140         _TNL_ATTRIB_MAT_FRONT_EMISSION = 38,
 141         _TNL_ATTRIB_MAT_BACK_EMISSION = 39,
 142         _TNL_ATTRIB_MAT_FRONT_SHININESS = 40,
 143         _TNL_ATTRIB_MAT_BACK_SHININESS = 41,
 144         _TNL_ATTRIB_MAT_FRONT_INDEXES = 42,
 145         _TNL_ATTRIB_MAT_BACK_INDEXES = 43,
 146         _TNL_ATTRIB_EDGEFLAG = 44,
 147         _TNL_ATTRIB_POINTSIZE = 45,
 148         _TNL_ATTRIB_MAX = 46
 149 } ;
 150
 151 #define _TNL_ATTRIB_TEX(u)       (_TNL_ATTRIB_TEX0 + (u))
 152 #define _TNL_ATTRIB_GENERIC(n) (_TNL_ATTRIB_GENERIC0 + (n))
 153
 154 /* special index used for handing invalid glVertexAttribute() indices */
 155 #define _TNL_ATTRIB_ERROR    (_TNL_ATTRIB_GENERIC15 + 1)
 156
 157 /**
 158  * Handy attribute ranges:
 159  */
 160 #define _TNL_FIRST_PROG      _TNL_ATTRIB_WEIGHT
 161 #define _TNL_LAST_PROG       _TNL_ATTRIB_TEX7
 162
 163 #define _TNL_FIRST_TEX       _TNL_ATTRIB_TEX0
 164 #define _TNL_LAST_TEX        _TNL_ATTRIB_TEX7
 165
 166 #define _TNL_FIRST_GENERIC _TNL_ATTRIB_GENERIC0
 167 #define _TNL_LAST_GENERIC  _TNL_ATTRIB_GENERIC15
 168
 169 #define _TNL_FIRST_MAT       _TNL_ATTRIB_MAT_FRONT_AMBIENT
 170 #define _TNL_LAST_MAT        _TNL_ATTRIB_MAT_BACK_INDEXES
 171
 172 /* Number of available generic attributes */
 173 #define _TNL_NUM_GENERIC 16
 174
 175 /* Number of attributes used for evaluators */
 176 #define _TNL_NUM_EVAL 16
 177
 178 #define PRIM_BEGIN     0x10
 179 #define PRIM_END       0x20
 180 #define PRIM_WEAK      0x40
 181 #define PRIM_MODE_MASK 0x0f
 182
 183 /*
 184  */
 185 struct tnl_prim {
 186    GLuint mode;
 187    GLuint start;
 188    GLuint count;
 189 };
 190
 191
 192
 193 struct tnl_eval1_map {
 194    struct gl_1d_map *map;
 195    GLuint sz;
 196 };
 197
 198 struct tnl_eval2_map {
 199    struct gl_2d_map *map;
 200    GLuint sz;
 201 };
 202
 203 struct tnl_eval {
 204    GLuint new_state;
 205    struct tnl_eval1_map map1[_TNL_NUM_EVAL];
 206    struct tnl_eval2_map map2[_TNL_NUM_EVAL];
 207 };
 208
 209
 210 #define TNL_MAX_PRIM 16
 211 #define TNL_MAX_COPIED_VERTS 3
 212
 213 struct tnl_copied_vtx {
 214    GLfloat buffer[_TNL_ATTRIB_MAX * 4 * TNL_MAX_COPIED_VERTS];
 215    GLuint nr;
 216 };
 217
 218 #define VERT_BUFFER_SIZE 2048   /* 8kbytes */
 219
 220
 221 typedef void (*tnl_attrfv_func)( const GLfloat * );
 222
 223 struct _tnl_dynfn {
 224    struct _tnl_dynfn *next, *prev;
 225    GLuint key;
 226    char *code;
 227 };
 228
 229 struct _tnl_dynfn_lists {
 230    struct _tnl_dynfn Vertex[4];
 231    struct _tnl_dynfn Attribute[4];
 232 };
 233
 234 struct _tnl_dynfn_generators {
 235    struct _tnl_dynfn *(*Vertex[4])( GLcontext *ctx, int key );
 236    struct _tnl_dynfn *(*Attribute[4])( GLcontext *ctx, int key );
 237 };
 238
 239 #define _TNL_MAX_ATTR_CODEGEN 32
 240
 241
 242 /**
 243  * The assembly of vertices in immediate mode is separated from
 244  * display list compilation.  This allows a simpler immediate mode
 245  * treatment and a display list compiler better suited to
 246  * hardware-acceleration.
 247  */
 248 struct tnl_vtx {
 249    GLfloat buffer[VERT_BUFFER_SIZE];
 250    GLubyte attrsz[_TNL_ATTRIB_MAX];
 251    GLubyte active_sz[_TNL_ATTRIB_MAX];
 252    GLuint vertex_size;
 253    struct tnl_prim prim[TNL_MAX_PRIM];
 254    GLuint prim_count;
 255    GLfloat *vbptr;                    /* cursor, points into buffer */
 256    GLfloat vertex[_TNL_ATTRIB_MAX*4]; /* current vertex */
 257    GLfloat *attrptr[_TNL_ATTRIB_MAX]; /* points into vertex */
 258    GLfloat *current[_TNL_ATTRIB_MAX]; /* points into ctx->Current, etc */
 259    GLfloat CurrentFloatEdgeFlag;
 260    GLuint counter, initial_counter;
 261    struct tnl_copied_vtx copied;
 262
 263    /** Note extra space for error handler: */
 264    tnl_attrfv_func tabfv[_TNL_ATTRIB_ERROR+1][4];
 265
 266    struct _tnl_dynfn_lists cache;
 267    struct _tnl_dynfn_generators gen;
 268
 269    struct tnl_eval eval;
 270    GLboolean *edgeflag_tmp;
 271    GLboolean have_materials;
 272 };
 273
 274
 275
 276
 277 /* For display lists, this structure holds a run of vertices of the
 278  * same format, and a strictly well-formed set of begin/end pairs,
 279  * starting on the first vertex and ending at the last.  Vertex
 280  * copying on buffer breaks is precomputed according to these
 281  * primitives, though there are situations where the copying will need
 282  * correction at execute-time, perhaps by replaying the list as
 283  * immediate mode commands.
 284  *
 285  * On executing this list, the 'current' values may be updated with
 286  * the values of the final vertex, and often no fixup of the start of
 287  * the vertex list is required.
 288  *
 289  * Eval and other commands that don't fit into these vertex lists are
 290  * compiled using the fallback opcode mechanism provided by dlist.c.
 291  */
 292 struct tnl_vertex_list {
 293    GLubyte attrsz[_TNL_ATTRIB_MAX];
 294    GLuint vertex_size;
 295
 296    GLfloat *buffer;
 297    GLuint count;
 298    GLuint wrap_count;           /* number of copied vertices at start */
 299    GLboolean have_materials;    /* bit of a hack - quick check for materials */
 300    GLboolean dangling_attr_ref; /* current attr implicitly referenced
 301                                    outside the list */
 302
 303    GLfloat *normal_lengths;
 304    struct tnl_prim *prim;
 305    GLuint prim_count;
 306
 307    struct tnl_vertex_store *vertex_store;
 308    struct tnl_primitive_store *prim_store;
 309 };
 310
 311 /* These buffers should be a reasonable size to support upload to
 312  * hardware?  Maybe drivers should stitch them back together, or
 313  * specify a desired size?
 314  */
 315 #define SAVE_BUFFER_SIZE (16*1024)
 316 #define SAVE_PRIM_SIZE   128
 317
 318 /* Storage to be shared among several vertex_lists.
 319  */
 320 struct tnl_vertex_store {
 321    GLfloat buffer[SAVE_BUFFER_SIZE];
 322    GLuint used;
 323    GLuint refcount;
 324 };
 325
 326 struct tnl_primitive_store {
 327    struct tnl_prim buffer[SAVE_PRIM_SIZE];
 328    GLuint used;
 329    GLuint refcount;
 330 };
 331
 332
 333 struct tnl_save {
 334    GLubyte attrsz[_TNL_ATTRIB_MAX];
 335    GLuint vertex_size;
 336
 337    GLfloat *buffer;
 338    GLuint count;
 339    GLuint wrap_count;
 340    GLuint replay_flags;
 341
 342    struct tnl_prim *prim;
 343    GLuint prim_count, prim_max;
 344
 345    struct tnl_vertex_store *vertex_store;
 346    struct tnl_primitive_store *prim_store;
 347
 348    GLfloat *vbptr;                 /* cursor, points into buffer */
 349    GLfloat vertex[_TNL_ATTRIB_MAX*4];      /* current values */
 350    GLfloat *attrptr[_TNL_ATTRIB_MAX];
 351    GLuint counter, initial_counter;
 352    GLboolean dangling_attr_ref;
 353    GLboolean have_materials;
 354
 355    GLuint opcode_vertex_list;
 356
 357    struct tnl_copied_vtx copied;
 358
 359    GLfloat CurrentFloatEdgeFlag;
 360
 361    GLfloat *current[_TNL_ATTRIB_MAX]; /* points into ctx->ListState */
 362    GLubyte *currentsz[_TNL_ATTRIB_MAX];
 363
 364    void (*tabfv[_TNL_ATTRIB_MAX][4])( const GLfloat * );
 365 };
 366
 367
 368 /**
 369  * A collection of vertex arrays.
 370  */
 371 struct tnl_vertex_arrays
 372 {
 373    /* Conventional vertex attribute arrays */
 374    GLvector4f  Obj;
 375    GLvector4f  Normal;
 376    GLvector4f  Color;
 377    GLvector4f  SecondaryColor;
 378    GLvector4f  FogCoord;
 379    GLvector4f  TexCoord[MAX_TEXTURE_COORD_UNITS];
 380    GLvector4f  Index;
 381
 382    GLubyte     *EdgeFlag;
 383    GLuint      *Elt;
 384
 385    /* These attributes don't alias with the conventional attributes.
 386     * The GL_NV_vertex_program extension defines 16 extra sets of vertex
 387     * arrays which have precedent over the conventional arrays when enabled.
 388     */
 389    /* XXX I think the array size is wronge (47 vs. 16) */
 390    GLvector4f  Attribs[_TNL_ATTRIB_MAX];
 391 };
 392
 393
 394 /**
 395  * Contains the current state of a running pipeline.
 396  */
 397 struct vertex_buffer
 398 {
 399    GLuint Size;  /**< Max vertices per vertex buffer, constant */
 400
 401    /* Constant over the pipeline.
 402     */
 403    GLuint Count;  /**< Number of vertices currently in buffer */
 404
 405    /* Pointers to current data.
 406     * XXX some of these fields alias AttribPtr below and should be removed
 407     * such as NormalPtr, TexCoordPtr, FogCoordPtr, etc.
 408     */
 409    GLuint      *Elts;
 410    GLvector4f  *ObjPtr;                         /* _TNL_BIT_POS */
 411    GLvector4f  *EyePtr;                         /* _TNL_BIT_POS */
 412    GLvector4f  *ClipPtr;                        /* _TNL_BIT_POS */
 413    GLvector4f  *NdcPtr;                         /* _TNL_BIT_POS */
 414    GLubyte     ClipOrMask;                      /* _TNL_BIT_POS */
 415    GLubyte     ClipAndMask;                     /* _TNL_BIT_POS */
 416    GLubyte     *ClipMask;                       /* _TNL_BIT_POS */
 417    GLvector4f  *NormalPtr;                      /* _TNL_BIT_NORMAL */
 418    GLfloat     *NormalLengthPtr;                /* _TNL_BIT_NORMAL */
 419    GLboolean   *EdgeFlag;                       /* _TNL_BIT_EDGEFLAG */
 420    GLvector4f  *TexCoordPtr[MAX_TEXTURE_COORD_UNITS]; /* VERT_TEX_0..n */
 421    GLvector4f  *IndexPtr[2];                    /* _TNL_BIT_INDEX */
 422    GLvector4f  *ColorPtr[2];                    /* _TNL_BIT_COLOR0 */
 423    GLvector4f  *SecondaryColorPtr[2];           /* _TNL_BIT_COLOR1 */
 424    GLvector4f  *FogCoordPtr;                    /* _TNL_BIT_FOG */
 425    GLvector4f  *VaryingPtr[MAX_VARYING_VECTORS];
 426
 427    struct tnl_prim  *Primitive;
 428    GLuint      PrimitiveCount;
 429
 430    /* Inputs to the vertex program stage */
 431    /* XXX This array may be too large (47 vs. 16) */
 432    GLvector4f *AttribPtr[_TNL_ATTRIB_MAX];      /* GL_NV_vertex_program */
 433 };
 434
 435
 436 /**
 437  * Describes an individual operation on the pipeline.
 438  */
 439 struct tnl_pipeline_stage
 440 {
 441    const char *name;
 442
 443    /* Private data for the pipeline stage:
 444     */
 445    void *privatePtr;
 446
 447    /* Allocate private data
 448     */
 449    GLboolean (*create)( GLcontext *ctx, struct tnl_pipeline_stage * );
 450
 451    /* Free private data.
 452     */
 453    void (*destroy)( struct tnl_pipeline_stage * );
 454
 455    /* Called on any statechange or input array size change or
 456     * input array change to/from zero stride.
 457     */
 458    void (*validate)( GLcontext *ctx, struct tnl_pipeline_stage * );
 459
 460    /* Called from _tnl_run_pipeline().  The stage.changed_inputs value
 461     * encodes all inputs to thee struct which have changed.  If
 462     * non-zero, recompute all affected outputs of the stage, otherwise
 463     * execute any 'sideeffects' of the stage.
 464     *
 465     * Return value: GL_TRUE - keep going
 466     *               GL_FALSE - finished pipeline
 467     */
 468    GLboolean (*run)( GLcontext *ctx, struct tnl_pipeline_stage * );
 469 };
 470
 471
 472
 473 /** Contains the array of all pipeline stages.
 474  * The default values are defined at the end of t_pipeline.c
 475  */
 476 struct tnl_pipeline {
 477
 478    GLuint last_attrib_stride[_TNL_ATTRIB_MAX];
 479    GLuint last_attrib_size[_TNL_ATTRIB_MAX];
 480    GLuint input_changes;
 481    GLuint new_state;
 482
 483    struct tnl_pipeline_stage stages[MAX_PIPELINE_STAGES+1];
 484    GLuint nr_stages;
 485 };
 486
 487 struct tnl_clipspace;
 488 struct tnl_clipspace_attr;
 489
 490 typedef void (*tnl_extract_func)( const struct tnl_clipspace_attr *a,
 491                                   GLfloat *out,
 492                                   const GLubyte *v );
 493
 494 typedef void (*tnl_insert_func)( const struct tnl_clipspace_attr *a,
 495                                  GLubyte *v,
 496                                  const GLfloat *in );
 497
 498 typedef void (*tnl_emit_func)( GLcontext *ctx,
 499                                GLuint count,
 500                                GLubyte *dest );
 501
 502
 503 /**
 504  * Describes how to convert/move a vertex attribute from a vertex array
 505  * to a vertex structure.
 506  */
 507 struct tnl_clipspace_attr
 508 {
 509    GLuint attrib;          /* which vertex attrib (0=position, etc) */
 510    GLuint format;
 511    GLuint vertoffset;      /* position of the attrib in the vertex struct */
 512    GLuint vertattrsize;    /* size of the attribute in bytes */
 513    GLubyte *inputptr;
 514    GLuint inputstride;
 515    GLuint inputsize;
 516    const tnl_insert_func *insert;
 517    tnl_insert_func emit;
 518    tnl_extract_func extract;
 519    const GLfloat *vp;   /* NDC->Viewport mapping matrix */
 520 };
 521
 522
 523
 524
 525 typedef void (*tnl_points_func)( GLcontext *ctx, GLuint first, GLuint last );
 526 typedef void (*tnl_line_func)( GLcontext *ctx, GLuint v1, GLuint v2 );
 527 typedef void (*tnl_triangle_func)( GLcontext *ctx,
 528                                    GLuint v1, GLuint v2, GLuint v3 );
 529 typedef void (*tnl_quad_func)( GLcontext *ctx, GLuint v1, GLuint v2,
 530                                GLuint v3, GLuint v4 );
 531 typedef void (*tnl_render_func)( GLcontext *ctx, GLuint start, GLuint count,
 532                                  GLuint flags );
 533 typedef void (*tnl_interp_func)( GLcontext *ctx,
 534                                  GLfloat t, GLuint dst, GLuint out, GLuint in,
 535                                  GLboolean force_boundary );
 536 typedef void (*tnl_copy_pv_func)( GLcontext *ctx, GLuint dst, GLuint src );
 537 typedef void (*tnl_setup_func)( GLcontext *ctx,
 538                                 GLuint start, GLuint end,
 539                                 GLuint new_inputs);
 540
 541
 542 struct tnl_attr_type {
 543    GLuint format;
 544    GLuint size;
 545    GLuint stride;
 546    GLuint offset;
 547 };
 548
 549 struct tnl_clipspace_fastpath {
 550    GLuint vertex_size;
 551    GLuint attr_count;
 552    GLboolean match_strides;
 553
 554    struct tnl_attr_type *attr;
 555
 556    tnl_emit_func func;
 557    struct tnl_clipspace_fastpath *next;
 558 };
 559
 560 /**
 561  * Used to describe conversion of vertex arrays to vertex structures.
 562  * I.e. Structure of arrays to arrays of structs.
 563  */
 564 struct tnl_clipspace
 565 {
 566    GLboolean need_extras;
 567
 568    GLuint new_inputs;
 569
 570    GLubyte *vertex_buf;
 571    GLuint vertex_size;
 572    GLuint max_vertex_size;
 573
 574    struct tnl_clipspace_attr attr[_TNL_ATTRIB_MAX];
 575    GLuint attr_count;
 576
 577    tnl_emit_func emit;
 578    tnl_interp_func interp;
 579    tnl_copy_pv_func copy_pv;
 580
 581    /* Parameters and constants for codegen:
 582     */
 583    GLboolean need_viewport;
 584    GLfloat vp_scale[4];
 585    GLfloat vp_xlate[4];
 586    GLfloat chan_scale[4];
 587    GLfloat identity[4];
 588
 589    struct tnl_clipspace_fastpath *fastpath;
 590
 591    void (*codegen_emit)( GLcontext *ctx );
 592 };
 593
 594
 595 struct tnl_cache_item {
 596    GLuint hash;
 597    void *key;
 598    void *data;
 599    struct tnl_cache_item *next;
 600 };
 601
 602 struct tnl_cache {
 603    struct tnl_cache_item **items;
 604    GLuint size, n_items;
 605 };
 606
 607
 608 struct tnl_device_driver
 609 {
 610    /***
 611     *** TNL Pipeline
 612     ***/
 613
 614    void (*RunPipeline)(GLcontext *ctx);
 615    /* Replaces PipelineStart/PipelineFinish -- intended to allow
 616     * drivers to wrap _tnl_run_pipeline() with code to validate state
 617     * and grab/release hardware locks.
 618     */
 619
 620    void (*NotifyMaterialChange)(GLcontext *ctx);
 621    /* Alert tnl-aware drivers of changes to material.
 622     */
 623
 624    void (*NotifyInputChanges)(GLcontext *ctx, GLuint bitmask);
 625    /* Alert tnl-aware drivers of changes to size and stride of input
 626     * arrays.
 627     */
 628
 629    GLboolean (*NotifyBegin)(GLcontext *ctx, GLenum p);
 630    /* Allow drivers to hook in optimized begin/end engines.
 631     * Return value:  GL_TRUE - driver handled the begin
 632     *                GL_FALSE - driver didn't handle the begin
 633     */
 634
 635    /***
 636     *** Rendering -- These functions called only from t_vb_render.c
 637     ***/
 638    struct
 639    {
 640       void (*Start)(GLcontext *ctx);
 641       void (*Finish)(GLcontext *ctx);
 642       /* Called before and after all rendering operations, including DrawPixels,
 643        * ReadPixels, Bitmap, span functions, and CopyTexImage, etc commands.
 644        * These are a suitable place for grabbing/releasing hardware locks.
 645        */
 646
 647       void (*PrimitiveNotify)(GLcontext *ctx, GLenum mode);
 648       /* Called between RenderStart() and RenderFinish() to indicate the
 649        * type of primitive we're about to draw.  Mode will be one of the
 650        * modes accepted by glBegin().
 651        */
 652
 653       tnl_interp_func Interp;
 654       /* The interp function is called by the clipping routines when we need
 655        * to generate an interpolated vertex.  All pertinant vertex ancilliary
 656        * data should be computed by interpolating between the 'in' and 'out'
 657        * vertices.
 658        */
 659
 660       tnl_copy_pv_func CopyPV;
 661       /* The copy function is used to make a copy of a vertex.  All pertinant
 662        * vertex attributes should be copied.
 663        */
 664
 665       void (*ClippedPolygon)( GLcontext *ctx, const GLuint *elts, GLuint n );
 666       /* Render a polygon with <n> vertices whose indexes are in the <elts>
 667        * array.
 668        */
 669
 670       void (*ClippedLine)( GLcontext *ctx, GLuint v0, GLuint v1 );
 671       /* Render a line between the two vertices given by indexes v0 and v1. */
 672
 673       tnl_points_func           Points; /* must now respect vb->elts */
 674       tnl_line_func             Line;
 675       tnl_triangle_func         Triangle;
 676       tnl_quad_func             Quad;
 677       /* These functions are called in order to render points, lines,
 678        * triangles and quads.  These are only called via the T&L module.
 679        */
 680
 681       tnl_render_func          *PrimTabVerts;
 682       tnl_render_func          *PrimTabElts;
 683       /* Render whole unclipped primitives (points, lines, linestrips,
 684        * lineloops, etc).  The tables are indexed by the GL enum of the
 685        * primitive to be rendered.  RenderTabVerts is used for non-indexed
 686        * arrays of vertices.  RenderTabElts is used for indexed arrays of
 687        * vertices.
 688        */
 689
 690       void (*ResetLineStipple)( GLcontext *ctx );
 691       /* Reset the hardware's line stipple counter.
 692        */
 693
 694       tnl_setup_func BuildVertices;
 695       /* This function is called whenever new vertices are required for
 696        * rendering.  The vertices in question are those n such that start
 697        * <= n < end.  The new_inputs parameter indicates those fields of
 698        * the vertex which need to be updated, if only a partial repair of
 699        * the vertex is required.
 700        *
 701        * This function is called only from _tnl_render_stage in tnl/t_render.c.
 702        */
 703
 704
 705       GLboolean (*Multipass)( GLcontext *ctx, GLuint passno );
 706       /* Driver may request additional render passes by returning GL_TRUE
 707        * when this function is called.  This function will be called
 708        * after the first pass, and passes will be made until the function
 709        * returns GL_FALSE.  If no function is registered, only one pass
 710        * is made.
 711        *
 712        * This function will be first invoked with passno == 1.
 713        */
 714    } Render;
 715 };
 716
 717
 718 #define DECLARE_RENDERINPUTS(name) BITSET64_DECLARE(name, _TNL_ATTRIB_MAX)
 719 #define RENDERINPUTS_COPY BITSET64_COPY
 720 #define RENDERINPUTS_EQUAL BITSET64_EQUAL
 721 #define RENDERINPUTS_ZERO BITSET64_ZERO
 722 #define RENDERINPUTS_ONES BITSET64_ONES
 723 #define RENDERINPUTS_TEST BITSET64_TEST
 724 #define RENDERINPUTS_SET BITSET64_SET
 725 #define RENDERINPUTS_CLEAR BITSET64_CLEAR
 726 #define RENDERINPUTS_TEST_RANGE BITSET64_TEST_RANGE
 727 #define RENDERINPUTS_SET_RANGE BITSET64_SET_RANGE
 728 #define RENDERINPUTS_CLEAR_RANGE BITSET64_CLEAR_RANGE
 729
 730
 731 /**
 732  * Context state for T&L context.
 733  */
 734 typedef struct
 735 {
 736    /* Driver interface.
 737     */
 738    struct tnl_device_driver Driver;
 739
 740    /* Execute:
 741     */
 742    struct tnl_vtx vtx;
 743
 744    /* Compile:
 745     */
 746    struct tnl_save save;
 747
 748    /* Pipeline
 749     */
 750    struct tnl_pipeline pipeline;
 751    struct vertex_buffer vb;
 752
 753    /* GLvectors for binding to vb:
 754     */
 755    struct tnl_vertex_arrays vtx_inputs;
 756    struct tnl_vertex_arrays save_inputs;
 757    struct tnl_vertex_arrays current;
 758    struct tnl_vertex_arrays array_inputs;
 759
 760    /* Clipspace/ndc/window vertex managment:
 761     */
 762    struct tnl_clipspace clipspace;
 763
 764    /* Probably need a better configuration mechanism:
 765     */
 766    GLboolean NeedNdcCoords;
 767    GLboolean LoopbackDListCassettes;
 768    GLboolean CalcDListNormalLengths;
 769    GLboolean IsolateMaterials;
 770    GLboolean AllowVertexFog;
 771    GLboolean AllowPixelFog;
 772    GLboolean AllowCodegen;
 773
 774    GLboolean _DoVertexFog;  /* eval fog function at each vertex? */
 775
 776    /* If True, it means we started a glBegin/End primtive with an invalid
 777     * vertex/fragment program or incomplete framebuffer.  In that case,
 778     * discard any buffered vertex data.
 779     */
 780    GLboolean DiscardPrimitive;
 781
 782    DECLARE_RENDERINPUTS(render_inputs_bitset);
 783
 784    GLvertexformat exec_vtxfmt;
 785    GLvertexformat save_vtxfmt;
 786
 787    struct tnl_cache *vp_cache;
 788
 789 } TNLcontext;
 790
 791
 792
 793 #define TNL_CONTEXT(ctx) ((TNLcontext *)((ctx)->swtnl_context))
 794
 795
 796 #define TYPE_IDX(t) ((t) & 0xf)
 797 #define MAX_TYPES TYPE_IDX(GL_DOUBLE)+1      /* 0xa + 1 */
 798
 799
 800 #endif