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    GLuint vertex_size;
 252    struct tnl_prim prim[TNL_MAX_PRIM];
 253    GLuint prim_count;
 254    GLfloat *vbptr;                    /* cursor, points into buffer */
 255    GLfloat vertex[_TNL_ATTRIB_MAX*4]; /* current vertex */
 256    GLfloat *attrptr[_TNL_ATTRIB_MAX]; /* points into vertex */
 257    GLfloat *current[_TNL_ATTRIB_MAX]; /* points into ctx->Current, etc */
 258    GLfloat CurrentFloatEdgeFlag;
 259    GLuint counter, initial_counter;
 260    struct tnl_copied_vtx copied;
 261
 262    /** Note extra space for error handler: */
 263    tnl_attrfv_func tabfv[_TNL_ATTRIB_ERROR+1][4];
 264
 265    struct _tnl_dynfn_lists cache;
 266    struct _tnl_dynfn_generators gen;
 267
 268    struct tnl_eval eval;
 269    GLboolean *edgeflag_tmp;
 270    GLboolean have_materials;
 271 };
 272
 273
 274
 275
 276 /* For display lists, this structure holds a run of vertices of the
 277  * same format, and a strictly well-formed set of begin/end pairs,
 278  * starting on the first vertex and ending at the last.  Vertex
 279  * copying on buffer breaks is precomputed according to these
 280  * primitives, though there are situations where the copying will need
 281  * correction at execute-time, perhaps by replaying the list as
 282  * immediate mode commands.
 283  *
 284  * On executing this list, the 'current' values may be updated with
 285  * the values of the final vertex, and often no fixup of the start of
 286  * the vertex list is required.
 287  *
 288  * Eval and other commands that don't fit into these vertex lists are
 289  * compiled using the fallback opcode mechanism provided by dlist.c.
 290  */
 291 struct tnl_vertex_list {
 292    GLubyte attrsz[_TNL_ATTRIB_MAX];
 293    GLuint vertex_size;
 294
 295    GLfloat *buffer;
 296    GLuint count;
 297    GLuint wrap_count;           /* number of copied vertices at start */
 298    GLboolean have_materials;    /* bit of a hack - quick check for materials */
 299    GLboolean dangling_attr_ref; /* current attr implicitly referenced
 300                                    outside the list */
 301
 302    GLfloat *normal_lengths;
 303    struct tnl_prim *prim;
 304    GLuint prim_count;
 305
 306    struct tnl_vertex_store *vertex_store;
 307    struct tnl_primitive_store *prim_store;
 308 };
 309
 310 /* These buffers should be a reasonable size to support upload to
 311  * hardware?  Maybe drivers should stitch them back together, or
 312  * specify a desired size?
 313  */
 314 #define SAVE_BUFFER_SIZE (16*1024)
 315 #define SAVE_PRIM_SIZE   128
 316
 317 /* Storage to be shared among several vertex_lists.
 318  */
 319 struct tnl_vertex_store {
 320    GLfloat buffer[SAVE_BUFFER_SIZE];
 321    GLuint used;
 322    GLuint refcount;
 323 };
 324
 325 struct tnl_primitive_store {
 326    struct tnl_prim buffer[SAVE_PRIM_SIZE];
 327    GLuint used;
 328    GLuint refcount;
 329 };
 330
 331
 332 struct tnl_save {
 333    GLubyte attrsz[_TNL_ATTRIB_MAX];
 334    GLuint vertex_size;
 335
 336    GLfloat *buffer;
 337    GLuint count;
 338    GLuint wrap_count;
 339    GLuint replay_flags;
 340
 341    struct tnl_prim *prim;
 342    GLuint prim_count, prim_max;
 343
 344    struct tnl_vertex_store *vertex_store;
 345    struct tnl_primitive_store *prim_store;
 346
 347    GLfloat *vbptr;                 /* cursor, points into buffer */
 348    GLfloat vertex[_TNL_ATTRIB_MAX*4];      /* current values */
 349    GLfloat *attrptr[_TNL_ATTRIB_MAX];
 350    GLuint counter, initial_counter;
 351    GLboolean dangling_attr_ref;
 352    GLboolean have_materials;
 353
 354    GLuint opcode_vertex_list;
 355
 356    struct tnl_copied_vtx copied;
 357
 358    GLfloat CurrentFloatEdgeFlag;
 359
 360    GLfloat *current[_TNL_ATTRIB_MAX]; /* points into ctx->ListState */
 361    GLubyte *currentsz[_TNL_ATTRIB_MAX];
 362
 363    void (*tabfv[_TNL_ATTRIB_MAX][4])( const GLfloat * );
 364 };
 365
 366
 367 /**
 368  * A collection of vertex arrays.
 369  */
 370 struct tnl_vertex_arrays
 371 {
 372    /* Conventional vertex attribute arrays */
 373    GLvector4f  Obj;
 374    GLvector4f  Normal;
 375    GLvector4f  Color;
 376    GLvector4f  SecondaryColor;
 377    GLvector4f  FogCoord;
 378    GLvector4f  TexCoord[MAX_TEXTURE_COORD_UNITS];
 379    GLvector4f  Index;
 380
 381    GLubyte     *EdgeFlag;
 382    GLuint      *Elt;
 383
 384    /* These attributes don't alias with the conventional attributes.
 385     * The GL_NV_vertex_program extension defines 16 extra sets of vertex
 386     * arrays which have precedent over the conventional arrays when enabled.
 387     */
 388    /* XXX I think the array size is wronge (47 vs. 16) */
 389    GLvector4f  Attribs[_TNL_ATTRIB_MAX];
 390 };
 391
 392
 393 /**
 394  * Contains the current state of a running pipeline.
 395  */
 396 struct vertex_buffer
 397 {
 398    GLuint Size;  /**< Max vertices per vertex buffer, constant */
 399
 400    /* Constant over the pipeline.
 401     */
 402    GLuint Count;  /**< Number of vertices currently in buffer */
 403
 404    /* Pointers to current data.
 405     * XXX some of these fields alias AttribPtr below and should be removed
 406     * such as NormalPtr, TexCoordPtr, FogCoordPtr, etc.
 407     */
 408    GLuint      *Elts;
 409    GLvector4f  *ObjPtr;                         /* _TNL_BIT_POS */
 410    GLvector4f  *EyePtr;                         /* _TNL_BIT_POS */
 411    GLvector4f  *ClipPtr;                        /* _TNL_BIT_POS */
 412    GLvector4f  *NdcPtr;                         /* _TNL_BIT_POS */
 413    GLubyte     ClipOrMask;                      /* _TNL_BIT_POS */
 414    GLubyte     ClipAndMask;                     /* _TNL_BIT_POS */
 415    GLubyte     *ClipMask;                       /* _TNL_BIT_POS */
 416    GLvector4f  *NormalPtr;                      /* _TNL_BIT_NORMAL */
 417    GLfloat     *NormalLengthPtr;                /* _TNL_BIT_NORMAL */
 418    GLboolean   *EdgeFlag;                       /* _TNL_BIT_EDGEFLAG */
 419    GLvector4f  *TexCoordPtr[MAX_TEXTURE_COORD_UNITS]; /* VERT_TEX_0..n */
 420    GLvector4f  *IndexPtr[2];                    /* _TNL_BIT_INDEX */
 421    GLvector4f  *ColorPtr[2];                    /* _TNL_BIT_COLOR0 */
 422    GLvector4f  *SecondaryColorPtr[2];           /* _TNL_BIT_COLOR1 */
 423    GLvector4f  *FogCoordPtr;                    /* _TNL_BIT_FOG */
 424    GLvector4f  *VaryingPtr[MAX_VARYING_VECTORS];
 425
 426    struct tnl_prim  *Primitive;
 427    GLuint      PrimitiveCount;
 428
 429    /* Inputs to the vertex program stage */
 430    /* XXX This array may be too large (47 vs. 16) */
 431    GLvector4f *AttribPtr[_TNL_ATTRIB_MAX];      /* GL_NV_vertex_program */
 432 };
 433
 434
 435 /**
 436  * Describes an individual operation on the pipeline.
 437  */
 438 struct tnl_pipeline_stage
 439 {
 440    const char *name;
 441
 442    /* Private data for the pipeline stage:
 443     */
 444    void *privatePtr;
 445
 446    /* Allocate private data
 447     */
 448    GLboolean (*create)( GLcontext *ctx, struct tnl_pipeline_stage * );
 449
 450    /* Free private data.
 451     */
 452    void (*destroy)( struct tnl_pipeline_stage * );
 453
 454    /* Called on any statechange or input array size change or
 455     * input array change to/from zero stride.
 456     */
 457    void (*validate)( GLcontext *ctx, struct tnl_pipeline_stage * );
 458
 459    /* Called from _tnl_run_pipeline().  The stage.changed_inputs value
 460     * encodes all inputs to thee struct which have changed.  If
 461     * non-zero, recompute all affected outputs of the stage, otherwise
 462     * execute any 'sideeffects' of the stage.
 463     *
 464     * Return value: GL_TRUE - keep going
 465     *               GL_FALSE - finished pipeline
 466     */
 467    GLboolean (*run)( GLcontext *ctx, struct tnl_pipeline_stage * );
 468 };
 469
 470
 471
 472 /** Contains the array of all pipeline stages.
 473  * The default values are defined at the end of t_pipeline.c
 474  */
 475 struct tnl_pipeline {
 476
 477    GLuint last_attrib_stride[_TNL_ATTRIB_MAX];
 478    GLuint last_attrib_size[_TNL_ATTRIB_MAX];
 479    GLuint input_changes;
 480    GLuint new_state;
 481
 482    struct tnl_pipeline_stage stages[MAX_PIPELINE_STAGES+1];
 483    GLuint nr_stages;
 484 };
 485
 486 struct tnl_clipspace;
 487 struct tnl_clipspace_attr;
 488
 489 typedef void (*tnl_extract_func)( const struct tnl_clipspace_attr *a,
 490                                   GLfloat *out,
 491                                   const GLubyte *v );
 492
 493 typedef void (*tnl_insert_func)( const struct tnl_clipspace_attr *a,
 494                                  GLubyte *v,
 495                                  const GLfloat *in );
 496
 497 typedef void (*tnl_emit_func)( GLcontext *ctx,
 498                                GLuint count,
 499                                GLubyte *dest );
 500
 501
 502 /**
 503  * Describes how to convert/move a vertex attribute from a vertex array
 504  * to a vertex structure.
 505  */
 506 struct tnl_clipspace_attr
 507 {
 508    GLuint attrib;          /* which vertex attrib (0=position, etc) */
 509    GLuint format;
 510    GLuint vertoffset;      /* position of the attrib in the vertex struct */
 511    GLuint vertattrsize;    /* size of the attribute in bytes */
 512    GLubyte *inputptr;
 513    GLuint inputstride;
 514    GLuint inputsize;
 515    const tnl_insert_func *insert;
 516    tnl_insert_func emit;
 517    tnl_extract_func extract;
 518    const GLfloat *vp;   /* NDC->Viewport mapping matrix */
 519 };
 520
 521
 522
 523
 524 typedef void (*tnl_points_func)( GLcontext *ctx, GLuint first, GLuint last );
 525 typedef void (*tnl_line_func)( GLcontext *ctx, GLuint v1, GLuint v2 );
 526 typedef void (*tnl_triangle_func)( GLcontext *ctx,
 527                                    GLuint v1, GLuint v2, GLuint v3 );
 528 typedef void (*tnl_quad_func)( GLcontext *ctx, GLuint v1, GLuint v2,
 529                                GLuint v3, GLuint v4 );
 530 typedef void (*tnl_render_func)( GLcontext *ctx, GLuint start, GLuint count,
 531                                  GLuint flags );
 532 typedef void (*tnl_interp_func)( GLcontext *ctx,
 533                                  GLfloat t, GLuint dst, GLuint out, GLuint in,
 534                                  GLboolean force_boundary );
 535 typedef void (*tnl_copy_pv_func)( GLcontext *ctx, GLuint dst, GLuint src );
 536 typedef void (*tnl_setup_func)( GLcontext *ctx,
 537                                 GLuint start, GLuint end,
 538                                 GLuint new_inputs);
 539
 540
 541 struct tnl_attr_type {
 542    GLuint format;
 543    GLuint size;
 544    GLuint stride;
 545    GLuint offset;
 546 };
 547
 548 struct tnl_clipspace_fastpath {
 549    GLuint vertex_size;
 550    GLuint attr_count;
 551    GLboolean match_strides;
 552
 553    struct tnl_attr_type *attr;
 554
 555    tnl_emit_func func;
 556    struct tnl_clipspace_fastpath *next;
 557 };
 558
 559 /**
 560  * Used to describe conversion of vertex arrays to vertex structures.
 561  * I.e. Structure of arrays to arrays of structs.
 562  */
 563 struct tnl_clipspace
 564 {
 565    GLboolean need_extras;
 566
 567    GLuint new_inputs;
 568
 569    GLubyte *vertex_buf;
 570    GLuint vertex_size;
 571    GLuint max_vertex_size;
 572
 573    struct tnl_clipspace_attr attr[_TNL_ATTRIB_MAX];
 574    GLuint attr_count;
 575
 576    tnl_emit_func emit;
 577    tnl_interp_func interp;
 578    tnl_copy_pv_func copy_pv;
 579
 580    /* Parameters and constants for codegen:
 581     */
 582    GLboolean need_viewport;
 583    GLfloat vp_scale[4];
 584    GLfloat vp_xlate[4];
 585    GLfloat chan_scale[4];
 586    GLfloat identity[4];
 587
 588    struct tnl_clipspace_fastpath *fastpath;
 589
 590    void (*codegen_emit)( GLcontext *ctx );
 591 };
 592
 593
 594 struct tnl_cache_item {
 595    GLuint hash;
 596    void *key;
 597    void *data;
 598    struct tnl_cache_item *next;
 599 };
 600
 601 struct tnl_cache {
 602    struct tnl_cache_item **items;
 603    GLuint size, n_items;
 604 };
 605
 606
 607 struct tnl_device_driver
 608 {
 609    /***
 610     *** TNL Pipeline
 611     ***/
 612
 613    void (*RunPipeline)(GLcontext *ctx);
 614    /* Replaces PipelineStart/PipelineFinish -- intended to allow
 615     * drivers to wrap _tnl_run_pipeline() with code to validate state
 616     * and grab/release hardware locks.
 617     */
 618
 619    void (*NotifyMaterialChange)(GLcontext *ctx);
 620    /* Alert tnl-aware drivers of changes to material.
 621     */
 622
 623    void (*NotifyInputChanges)(GLcontext *ctx, GLuint bitmask);
 624    /* Alert tnl-aware drivers of changes to size and stride of input
 625     * arrays.
 626     */
 627
 628    GLboolean (*NotifyBegin)(GLcontext *ctx, GLenum p);
 629    /* Allow drivers to hook in optimized begin/end engines.
 630     * Return value:  GL_TRUE - driver handled the begin
 631     *                GL_FALSE - driver didn't handle the begin
 632     */
 633
 634    /***
 635     *** Rendering -- These functions called only from t_vb_render.c
 636     ***/
 637    struct
 638    {
 639       void (*Start)(GLcontext *ctx);
 640       void (*Finish)(GLcontext *ctx);
 641       /* Called before and after all rendering operations, including DrawPixels,
 642        * ReadPixels, Bitmap, span functions, and CopyTexImage, etc commands.
 643        * These are a suitable place for grabbing/releasing hardware locks.
 644        */
 645
 646       void (*PrimitiveNotify)(GLcontext *ctx, GLenum mode);
 647       /* Called between RenderStart() and RenderFinish() to indicate the
 648        * type of primitive we're about to draw.  Mode will be one of the
 649        * modes accepted by glBegin().
 650        */
 651
 652       tnl_interp_func Interp;
 653       /* The interp function is called by the clipping routines when we need
 654        * to generate an interpolated vertex.  All pertinant vertex ancilliary
 655        * data should be computed by interpolating between the 'in' and 'out'
 656        * vertices.
 657        */
 658
 659       tnl_copy_pv_func CopyPV;
 660       /* The copy function is used to make a copy of a vertex.  All pertinant
 661        * vertex attributes should be copied.
 662        */
 663
 664       void (*ClippedPolygon)( GLcontext *ctx, const GLuint *elts, GLuint n );
 665       /* Render a polygon with <n> vertices whose indexes are in the <elts>
 666        * array.
 667        */
 668
 669       void (*ClippedLine)( GLcontext *ctx, GLuint v0, GLuint v1 );
 670       /* Render a line between the two vertices given by indexes v0 and v1. */
 671
 672       tnl_points_func           Points; /* must now respect vb->elts */
 673       tnl_line_func             Line;
 674       tnl_triangle_func         Triangle;
 675       tnl_quad_func             Quad;
 676       /* These functions are called in order to render points, lines,
 677        * triangles and quads.  These are only called via the T&L module.
 678        */
 679
 680       tnl_render_func          *PrimTabVerts;
 681       tnl_render_func          *PrimTabElts;
 682       /* Render whole unclipped primitives (points, lines, linestrips,
 683        * lineloops, etc).  The tables are indexed by the GL enum of the
 684        * primitive to be rendered.  RenderTabVerts is used for non-indexed
 685        * arrays of vertices.  RenderTabElts is used for indexed arrays of
 686        * vertices.
 687        */
 688
 689       void (*ResetLineStipple)( GLcontext *ctx );
 690       /* Reset the hardware's line stipple counter.
 691        */
 692
 693       tnl_setup_func BuildVertices;
 694       /* This function is called whenever new vertices are required for
 695        * rendering.  The vertices in question are those n such that start
 696        * <= n < end.  The new_inputs parameter indicates those fields of
 697        * the vertex which need to be updated, if only a partial repair of
 698        * the vertex is required.
 699        *
 700        * This function is called only from _tnl_render_stage in tnl/t_render.c.
 701        */
 702
 703
 704       GLboolean (*Multipass)( GLcontext *ctx, GLuint passno );
 705       /* Driver may request additional render passes by returning GL_TRUE
 706        * when this function is called.  This function will be called
 707        * after the first pass, and passes will be made until the function
 708        * returns GL_FALSE.  If no function is registered, only one pass
 709        * is made.
 710        *
 711        * This function will be first invoked with passno == 1.
 712        */
 713    } Render;
 714 };
 715
 716
 717 #define DECLARE_RENDERINPUTS(name) BITSET64_DECLARE(name, _TNL_ATTRIB_MAX)
 718 #define RENDERINPUTS_COPY BITSET64_COPY
 719 #define RENDERINPUTS_EQUAL BITSET64_EQUAL
 720 #define RENDERINPUTS_ZERO BITSET64_ZERO
 721 #define RENDERINPUTS_ONES BITSET64_ONES
 722 #define RENDERINPUTS_TEST BITSET64_TEST
 723 #define RENDERINPUTS_SET BITSET64_SET
 724 #define RENDERINPUTS_CLEAR BITSET64_CLEAR
 725 #define RENDERINPUTS_TEST_RANGE BITSET64_TEST_RANGE
 726 #define RENDERINPUTS_SET_RANGE BITSET64_SET_RANGE
 727 #define RENDERINPUTS_CLEAR_RANGE BITSET64_CLEAR_RANGE
 728
 729
 730 /**
 731  * Context state for T&L context.
 732  */
 733 typedef struct
 734 {
 735    /* Driver interface.
 736     */
 737    struct tnl_device_driver Driver;
 738
 739    /* Execute:
 740     */
 741    struct tnl_vtx vtx;
 742
 743    /* Compile:
 744     */
 745    struct tnl_save save;
 746
 747    /* Pipeline
 748     */
 749    struct tnl_pipeline pipeline;
 750    struct vertex_buffer vb;
 751
 752    /* GLvectors for binding to vb:
 753     */
 754    struct tnl_vertex_arrays vtx_inputs;
 755    struct tnl_vertex_arrays save_inputs;
 756    struct tnl_vertex_arrays current;
 757    struct tnl_vertex_arrays array_inputs;
 758
 759    /* Clipspace/ndc/window vertex managment:
 760     */
 761    struct tnl_clipspace clipspace;
 762
 763    /* Probably need a better configuration mechanism:
 764     */
 765    GLboolean NeedNdcCoords;
 766    GLboolean LoopbackDListCassettes;
 767    GLboolean CalcDListNormalLengths;
 768    GLboolean IsolateMaterials;
 769    GLboolean AllowVertexFog;
 770    GLboolean AllowPixelFog;
 771    GLboolean AllowCodegen;
 772
 773    GLboolean _DoVertexFog;  /* eval fog function at each vertex? */
 774
 775    /* If True, it means we started a glBegin/End primtive with an invalid
 776     * vertex/fragment program or incomplete framebuffer.  In that case,
 777     * discard any buffered vertex data.
 778     */
 779    GLboolean DiscardPrimitive;
 780
 781    DECLARE_RENDERINPUTS(render_inputs_bitset);
 782
 783    GLvertexformat exec_vtxfmt;
 784    GLvertexformat save_vtxfmt;
 785
 786    struct tnl_cache *vp_cache;
 787
 788 } TNLcontext;
 789
 790
 791
 792 #define TNL_CONTEXT(ctx) ((TNLcontext *)((ctx)->swtnl_context))
 793
 794
 795 #define TYPE_IDX(t) ((t) & 0xf)
 796 #define MAX_TYPES TYPE_IDX(GL_DOUBLE)+1      /* 0xa + 1 */
 797
 798
 799 #endif