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_ATTRIBUTE0 = 16,
 119         _TNL_ATTRIB_ATTRIBUTE1 = 17,
 120         _TNL_ATTRIB_ATTRIBUTE2 = 18,
 121         _TNL_ATTRIB_ATTRIBUTE3 = 19,
 122         _TNL_ATTRIB_ATTRIBUTE4 = 20,
 123         _TNL_ATTRIB_ATTRIBUTE5 = 21,
 124         _TNL_ATTRIB_ATTRIBUTE6 = 22,
 125         _TNL_ATTRIB_ATTRIBUTE7 = 23,
 126         _TNL_ATTRIB_ATTRIBUTE8 = 24,
 127         _TNL_ATTRIB_ATTRIBUTE9 = 25,
 128         _TNL_ATTRIB_ATTRIBUTE10 = 26,
 129         _TNL_ATTRIB_ATTRIBUTE11 = 27,
 130         _TNL_ATTRIB_ATTRIBUTE12 = 28,
 131         _TNL_ATTRIB_ATTRIBUTE13 = 29,
 132         _TNL_ATTRIB_ATTRIBUTE14 = 30,
 133         _TNL_ATTRIB_ATTRIBUTE15 = 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_ATTRIBUTE(n) (_TNL_ATTRIB_ATTRIBUTE0 + (n))
 153
 154 /* special index used for handing invalid glVertexAttribute() indices */
 155 #define _TNL_ATTRIB_ERROR    (_TNL_ATTRIB_ATTRIBUTE15 + 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_ATTRIBUTE _TNL_ATTRIB_ATTRIBUTE0
 167 #define _TNL_LAST_ATTRIBUTE  _TNL_ATTRIB_ATTRIBUTE15
 168
 169 #define _TNL_FIRST_MAT       _TNL_ATTRIB_MAT_FRONT_AMBIENT
 170 #define _TNL_LAST_MAT        _TNL_ATTRIB_MAT_BACK_INDEXES
 171
 172
 173 #define PRIM_BEGIN     0x10
 174 #define PRIM_END       0x20
 175 #define PRIM_WEAK      0x40
 176 #define PRIM_MODE_MASK 0x0f
 177
 178 /*
 179  */
 180 struct tnl_prim {
 181    GLuint mode;
 182    GLuint start;
 183    GLuint count;
 184 };
 185
 186
 187
 188 struct tnl_eval1_map {
 189    struct gl_1d_map *map;
 190    GLuint sz;
 191 };
 192
 193 struct tnl_eval2_map {
 194    struct gl_2d_map *map;
 195    GLuint sz;
 196 };
 197
 198 struct tnl_eval {
 199    GLuint new_state;
 200    struct tnl_eval1_map map1[_TNL_ATTRIB_EDGEFLAG + 1];
 201    struct tnl_eval2_map map2[_TNL_ATTRIB_EDGEFLAG + 1];
 202 };
 203
 204
 205 #define TNL_MAX_PRIM 16
 206 #define TNL_MAX_COPIED_VERTS 3
 207
 208 struct tnl_copied_vtx {
 209    GLfloat buffer[_TNL_ATTRIB_MAX * 4 * TNL_MAX_COPIED_VERTS];
 210    GLuint nr;
 211 };
 212
 213 #define VERT_BUFFER_SIZE 2048   /* 8kbytes */
 214
 215
 216 typedef void (*tnl_attrfv_func)( const GLfloat * );
 217
 218 struct _tnl_dynfn {
 219    struct _tnl_dynfn *next, *prev;
 220    GLuint key;
 221    char *code;
 222 };
 223
 224 struct _tnl_dynfn_lists {
 225    struct _tnl_dynfn Vertex[4];
 226    struct _tnl_dynfn Attribute[4];
 227 };
 228
 229 struct _tnl_dynfn_generators {
 230    struct _tnl_dynfn *(*Vertex[4])( GLcontext *ctx, int key );
 231    struct _tnl_dynfn *(*Attribute[4])( GLcontext *ctx, int key );
 232 };
 233
 234 #define _TNL_MAX_ATTR_CODEGEN 32
 235
 236
 237 /**
 238  * The assembly of vertices in immediate mode is separated from
 239  * display list compilation.  This allows a simpler immediate mode
 240  * treatment and a display list compiler better suited to
 241  * hardware-acceleration.
 242  */
 243 struct tnl_vtx {
 244    GLfloat buffer[VERT_BUFFER_SIZE];
 245    GLubyte attrsz[_TNL_ATTRIB_MAX];
 246    GLuint vertex_size;
 247    struct tnl_prim prim[TNL_MAX_PRIM];
 248    GLuint prim_count;
 249    GLfloat *vbptr;                    /* cursor, points into buffer */
 250    GLfloat vertex[_TNL_ATTRIB_MAX*4]; /* current vertex */
 251    GLfloat *attrptr[_TNL_ATTRIB_MAX]; /* points into vertex */
 252    GLfloat *current[_TNL_ATTRIB_MAX]; /* points into ctx->Current, etc */
 253    GLfloat CurrentFloatEdgeFlag;
 254    GLuint counter, initial_counter;
 255    struct tnl_copied_vtx copied;
 256
 257    /** Note extra space for error handler: */
 258    tnl_attrfv_func tabfv[_TNL_ATTRIB_ERROR+1][4];
 259
 260    struct _tnl_dynfn_lists cache;
 261    struct _tnl_dynfn_generators gen;
 262
 263    struct tnl_eval eval;
 264    GLboolean *edgeflag_tmp;
 265    GLboolean have_materials;
 266 };
 267
 268
 269
 270
 271 /* For display lists, this structure holds a run of vertices of the
 272  * same format, and a strictly well-formed set of begin/end pairs,
 273  * starting on the first vertex and ending at the last.  Vertex
 274  * copying on buffer breaks is precomputed according to these
 275  * primitives, though there are situations where the copying will need
 276  * correction at execute-time, perhaps by replaying the list as
 277  * immediate mode commands.
 278  *
 279  * On executing this list, the 'current' values may be updated with
 280  * the values of the final vertex, and often no fixup of the start of
 281  * the vertex list is required.
 282  *
 283  * Eval and other commands that don't fit into these vertex lists are
 284  * compiled using the fallback opcode mechanism provided by dlist.c.
 285  */
 286 struct tnl_vertex_list {
 287    GLubyte attrsz[_TNL_ATTRIB_MAX];
 288    GLuint vertex_size;
 289
 290    GLfloat *buffer;
 291    GLuint count;
 292    GLuint wrap_count;           /* number of copied vertices at start */
 293    GLboolean have_materials;    /* bit of a hack - quick check for materials */
 294    GLboolean dangling_attr_ref; /* current attr implicitly referenced
 295                                    outside the list */
 296
 297    GLfloat *normal_lengths;
 298    struct tnl_prim *prim;
 299    GLuint prim_count;
 300
 301    struct tnl_vertex_store *vertex_store;
 302    struct tnl_primitive_store *prim_store;
 303 };
 304
 305 /* These buffers should be a reasonable size to support upload to
 306  * hardware?  Maybe drivers should stitch them back together, or
 307  * specify a desired size?
 308  */
 309 #define SAVE_BUFFER_SIZE (16*1024)
 310 #define SAVE_PRIM_SIZE   128
 311
 312 /* Storage to be shared among several vertex_lists.
 313  */
 314 struct tnl_vertex_store {
 315    GLfloat buffer[SAVE_BUFFER_SIZE];
 316    GLuint used;
 317    GLuint refcount;
 318 };
 319
 320 struct tnl_primitive_store {
 321    struct tnl_prim buffer[SAVE_PRIM_SIZE];
 322    GLuint used;
 323    GLuint refcount;
 324 };
 325
 326
 327 struct tnl_save {
 328    GLubyte attrsz[_TNL_ATTRIB_MAX];
 329    GLuint vertex_size;
 330
 331    GLfloat *buffer;
 332    GLuint count;
 333    GLuint wrap_count;
 334    GLuint replay_flags;
 335
 336    struct tnl_prim *prim;
 337    GLuint prim_count, prim_max;
 338
 339    struct tnl_vertex_store *vertex_store;
 340    struct tnl_primitive_store *prim_store;
 341
 342    GLfloat *vbptr;                 /* cursor, points into buffer */
 343    GLfloat vertex[_TNL_ATTRIB_MAX*4];      /* current values */
 344    GLfloat *attrptr[_TNL_ATTRIB_MAX];
 345    GLuint counter, initial_counter;
 346    GLboolean dangling_attr_ref;
 347    GLboolean have_materials;
 348
 349    GLuint opcode_vertex_list;
 350
 351    struct tnl_copied_vtx copied;
 352
 353    GLfloat CurrentFloatEdgeFlag;
 354
 355    GLfloat *current[_TNL_ATTRIB_MAX]; /* points into ctx->ListState */
 356    GLubyte *currentsz[_TNL_ATTRIB_MAX];
 357
 358    void (*tabfv[_TNL_ATTRIB_MAX][4])( const GLfloat * );
 359 };
 360
 361
 362 struct tnl_vertex_arrays
 363 {
 364    /* Conventional vertex attribute arrays */
 365    GLvector4f  Obj;
 366    GLvector4f  Normal;
 367    GLvector4f  Color;
 368    GLvector4f  SecondaryColor;
 369    GLvector4f  FogCoord;
 370    GLvector4f  TexCoord[MAX_TEXTURE_COORD_UNITS];
 371    GLvector4f  Index;
 372
 373    GLubyte     *EdgeFlag;
 374    GLuint      *Elt;
 375
 376    /* These attributes don't alias with the conventional attributes.
 377     * The GL_NV_vertex_program extension defines 16 extra sets of vertex
 378     * arrays which have precedent over the conventional arrays when enabled.
 379     */
 380    /* XXX I think the array size is wronge (47 vs. 16) */
 381    GLvector4f  Attribs[_TNL_ATTRIB_MAX];
 382 };
 383
 384
 385 /**
 386  * Contains the current state of a running pipeline.
 387  */
 388 struct vertex_buffer
 389 {
 390    /* Constant over life of the vertex_buffer.
 391     */
 392    GLuint      Size;
 393
 394    /* Constant over the pipeline.
 395     */
 396    GLuint      Count;                         /* for everything except Elts */
 397
 398    /* Pointers to current data.
 399     */
 400    GLuint      *Elts;
 401    GLvector4f  *ObjPtr;                         /* _TNL_BIT_POS */
 402    GLvector4f  *EyePtr;                         /* _TNL_BIT_POS */
 403    GLvector4f  *ClipPtr;                        /* _TNL_BIT_POS */
 404    GLvector4f  *NdcPtr;                         /* _TNL_BIT_POS */
 405    GLubyte     ClipOrMask;                      /* _TNL_BIT_POS */
 406    GLubyte     ClipAndMask;                     /* _TNL_BIT_POS */
 407    GLubyte     *ClipMask;                       /* _TNL_BIT_POS */
 408    GLvector4f  *NormalPtr;                      /* _TNL_BIT_NORMAL */
 409    GLfloat     *NormalLengthPtr;                /* _TNL_BIT_NORMAL */
 410    GLboolean   *EdgeFlag;                       /* _TNL_BIT_EDGEFLAG */
 411    GLvector4f  *TexCoordPtr[MAX_TEXTURE_COORD_UNITS]; /* VERT_TEX_0..n */
 412    GLvector4f  *IndexPtr[2];                    /* _TNL_BIT_INDEX */
 413    GLvector4f  *ColorPtr[2];                    /* _TNL_BIT_COLOR0 */
 414    GLvector4f  *SecondaryColorPtr[2];           /* _TNL_BIT_COLOR1 */
 415    GLvector4f  *PointSizePtr;                   /* _TNL_BIT_POS */
 416    GLvector4f  *FogCoordPtr;                    /* _TNL_BIT_FOG */
 417    GLvector4f  *VaryingPtr[MAX_VARYING_VECTORS];
 418
 419    struct tnl_prim  *Primitive;
 420    GLuint      PrimitiveCount;
 421
 422    /* Inputs to the vertex program stage */
 423    /* XXX This array may be too large (47 vs. 16) */
 424    GLvector4f *AttribPtr[_TNL_ATTRIB_MAX];      /* GL_NV_vertex_program */
 425 };
 426
 427
 428 /** Describes an individual operation on the pipeline.
 429  */
 430 struct tnl_pipeline_stage
 431 {
 432    const char *name;
 433
 434    /* Private data for the pipeline stage:
 435     */
 436    void *privatePtr;
 437
 438    /* Allocate private data
 439     */
 440    GLboolean (*create)( GLcontext *ctx, struct tnl_pipeline_stage * );
 441
 442    /* Free private data.
 443     */
 444    void (*destroy)( struct tnl_pipeline_stage * );
 445
 446    /* Called on any statechange or input array size change or
 447     * input array change to/from zero stride.
 448     */
 449    void (*validate)( GLcontext *ctx, struct tnl_pipeline_stage * );
 450
 451    /* Called from _tnl_run_pipeline().  The stage.changed_inputs value
 452     * encodes all inputs to thee struct which have changed.  If
 453     * non-zero, recompute all affected outputs of the stage, otherwise
 454     * execute any 'sideeffects' of the stage.
 455     *
 456     * Return value: GL_TRUE - keep going
 457     *               GL_FALSE - finished pipeline
 458     */
 459    GLboolean (*run)( GLcontext *ctx, struct tnl_pipeline_stage * );
 460 };
 461
 462
 463
 464 /** Contains the array of all pipeline stages.
 465  * The default values are defined at the end of t_pipeline.c
 466  */
 467 struct tnl_pipeline {
 468
 469    GLuint last_attrib_stride[_TNL_ATTRIB_MAX];
 470    GLuint last_attrib_size[_TNL_ATTRIB_MAX];
 471    GLuint input_changes;
 472    GLuint new_state;
 473
 474    struct tnl_pipeline_stage stages[MAX_PIPELINE_STAGES+1];
 475    GLuint nr_stages;
 476 };
 477
 478 struct tnl_clipspace;
 479 struct tnl_clipspace_attr;
 480
 481 typedef void (*tnl_extract_func)( const struct tnl_clipspace_attr *a,
 482                                   GLfloat *out,
 483                                   const GLubyte *v );
 484
 485 typedef void (*tnl_insert_func)( const struct tnl_clipspace_attr *a,
 486                                  GLubyte *v,
 487                                  const GLfloat *in );
 488
 489 typedef void (*tnl_emit_func)( GLcontext *ctx,
 490                                GLuint count,
 491                                GLubyte *dest );
 492
 493
 494 /**
 495  * Describes how to convert/move a vertex attribute from a vertex array
 496  * to a vertex structure.
 497  */
 498 struct tnl_clipspace_attr
 499 {
 500    GLuint attrib;          /* which vertex attrib (0=position, etc) */
 501    GLuint format;
 502    GLuint vertoffset;      /* position of the attrib in the vertex struct */
 503    GLuint vertattrsize;    /* size of the attribute in bytes */
 504    GLubyte *inputptr;
 505    GLuint inputstride;
 506    GLuint inputsize;
 507    const tnl_insert_func *insert;
 508    tnl_insert_func emit;
 509    tnl_extract_func extract;
 510    const GLfloat *vp;   /* NDC->Viewport mapping matrix */
 511 };
 512
 513
 514
 515
 516 typedef void (*tnl_points_func)( GLcontext *ctx, GLuint first, GLuint last );
 517 typedef void (*tnl_line_func)( GLcontext *ctx, GLuint v1, GLuint v2 );
 518 typedef void (*tnl_triangle_func)( GLcontext *ctx,
 519                                    GLuint v1, GLuint v2, GLuint v3 );
 520 typedef void (*tnl_quad_func)( GLcontext *ctx, GLuint v1, GLuint v2,
 521                                GLuint v3, GLuint v4 );
 522 typedef void (*tnl_render_func)( GLcontext *ctx, GLuint start, GLuint count,
 523                                  GLuint flags );
 524 typedef void (*tnl_interp_func)( GLcontext *ctx,
 525                                  GLfloat t, GLuint dst, GLuint out, GLuint in,
 526                                  GLboolean force_boundary );
 527 typedef void (*tnl_copy_pv_func)( GLcontext *ctx, GLuint dst, GLuint src );
 528 typedef void (*tnl_setup_func)( GLcontext *ctx,
 529                                 GLuint start, GLuint end,
 530                                 GLuint new_inputs);
 531
 532
 533 struct tnl_clipspace_fastpath {
 534    GLuint vertex_size;
 535    GLuint attr_count;
 536    GLboolean match_strides;
 537
 538    struct attr_type {
 539       GLuint format;
 540       GLuint size;
 541       GLuint stride;
 542       GLuint offset;
 543    } *attr;
 544
 545    tnl_emit_func func;
 546    struct tnl_clipspace_fastpath *next;
 547 };
 548
 549 /**
 550  * Used to describe conversion of vertex arrays to vertex structures.
 551  * I.e. Structure of arrays to arrays of structs.
 552  */
 553 struct tnl_clipspace
 554 {
 555    GLboolean need_extras;
 556
 557    GLuint new_inputs;
 558
 559    GLubyte *vertex_buf;
 560    GLuint vertex_size;
 561    GLuint max_vertex_size;
 562
 563    struct tnl_clipspace_attr attr[_TNL_ATTRIB_MAX];
 564    GLuint attr_count;
 565
 566    tnl_emit_func emit;
 567    tnl_interp_func interp;
 568    tnl_copy_pv_func copy_pv;
 569
 570    /* Parameters and constants for codegen:
 571     */
 572    GLboolean need_viewport;
 573    GLfloat vp_scale[4];
 574    GLfloat vp_xlate[4];
 575    GLfloat chan_scale[4];
 576    GLfloat identity[4];
 577
 578    struct tnl_clipspace_fastpath *fastpath;
 579
 580    void (*codegen_emit)( GLcontext *ctx );
 581 };
 582
 583
 584 struct tnl_cache_item {
 585    GLuint hash;
 586    void *key;
 587    void *data;
 588    struct tnl_cache_item *next;
 589 };
 590
 591 struct tnl_cache {
 592    struct tnl_cache_item **items;
 593    GLuint size, n_items;
 594 };
 595
 596
 597 struct tnl_device_driver
 598 {
 599    /***
 600     *** TNL Pipeline
 601     ***/
 602
 603    void (*RunPipeline)(GLcontext *ctx);
 604    /* Replaces PipelineStart/PipelineFinish -- intended to allow
 605     * drivers to wrap _tnl_run_pipeline() with code to validate state
 606     * and grab/release hardware locks.
 607     */
 608
 609    void (*NotifyMaterialChange)(GLcontext *ctx);
 610    /* Alert tnl-aware drivers of changes to material.
 611     */
 612
 613    void (*NotifyInputChanges)(GLcontext *ctx, GLuint bitmask);
 614    /* Alert tnl-aware drivers of changes to size and stride of input
 615     * arrays.
 616     */
 617
 618    GLboolean (*NotifyBegin)(GLcontext *ctx, GLenum p);
 619    /* Allow drivers to hook in optimized begin/end engines.
 620     * Return value:  GL_TRUE - driver handled the begin
 621     *                GL_FALSE - driver didn't handle the begin
 622     */
 623
 624    /***
 625     *** Rendering -- These functions called only from t_vb_render.c
 626     ***/
 627    struct
 628    {
 629       void (*Start)(GLcontext *ctx);
 630       void (*Finish)(GLcontext *ctx);
 631       /* Called before and after all rendering operations, including DrawPixels,
 632        * ReadPixels, Bitmap, span functions, and CopyTexImage, etc commands.
 633        * These are a suitable place for grabbing/releasing hardware locks.
 634        */
 635
 636       void (*PrimitiveNotify)(GLcontext *ctx, GLenum mode);
 637       /* Called between RenderStart() and RenderFinish() to indicate the
 638        * type of primitive we're about to draw.  Mode will be one of the
 639        * modes accepted by glBegin().
 640        */
 641
 642       tnl_interp_func Interp;
 643       /* The interp function is called by the clipping routines when we need
 644        * to generate an interpolated vertex.  All pertinant vertex ancilliary
 645        * data should be computed by interpolating between the 'in' and 'out'
 646        * vertices.
 647        */
 648
 649       tnl_copy_pv_func CopyPV;
 650       /* The copy function is used to make a copy of a vertex.  All pertinant
 651        * vertex attributes should be copied.
 652        */
 653
 654       void (*ClippedPolygon)( GLcontext *ctx, const GLuint *elts, GLuint n );
 655       /* Render a polygon with <n> vertices whose indexes are in the <elts>
 656        * array.
 657        */
 658
 659       void (*ClippedLine)( GLcontext *ctx, GLuint v0, GLuint v1 );
 660       /* Render a line between the two vertices given by indexes v0 and v1. */
 661
 662       tnl_points_func           Points; /* must now respect vb->elts */
 663       tnl_line_func             Line;
 664       tnl_triangle_func         Triangle;
 665       tnl_quad_func             Quad;
 666       /* These functions are called in order to render points, lines,
 667        * triangles and quads.  These are only called via the T&L module.
 668        */
 669
 670       tnl_render_func          *PrimTabVerts;
 671       tnl_render_func          *PrimTabElts;
 672       /* Render whole unclipped primitives (points, lines, linestrips,
 673        * lineloops, etc).  The tables are indexed by the GL enum of the
 674        * primitive to be rendered.  RenderTabVerts is used for non-indexed
 675        * arrays of vertices.  RenderTabElts is used for indexed arrays of
 676        * vertices.
 677        */
 678
 679       void (*ResetLineStipple)( GLcontext *ctx );
 680       /* Reset the hardware's line stipple counter.
 681        */
 682
 683       tnl_setup_func BuildVertices;
 684       /* This function is called whenever new vertices are required for
 685        * rendering.  The vertices in question are those n such that start
 686        * <= n < end.  The new_inputs parameter indicates those fields of
 687        * the vertex which need to be updated, if only a partial repair of
 688        * the vertex is required.
 689        *
 690        * This function is called only from _tnl_render_stage in tnl/t_render.c.
 691        */
 692
 693
 694       GLboolean (*Multipass)( GLcontext *ctx, GLuint passno );
 695       /* Driver may request additional render passes by returning GL_TRUE
 696        * when this function is called.  This function will be called
 697        * after the first pass, and passes will be made until the function
 698        * returns GL_FALSE.  If no function is registered, only one pass
 699        * is made.
 700        *
 701        * This function will be first invoked with passno == 1.
 702        */
 703    } Render;
 704 };
 705
 706
 707 #define DECLARE_RENDERINPUTS(name) BITSET64_DECLARE(name, _TNL_ATTRIB_MAX)
 708 #define RENDERINPUTS_COPY BITSET64_COPY
 709 #define RENDERINPUTS_EQUAL BITSET64_EQUAL
 710 #define RENDERINPUTS_ZERO BITSET64_ZERO
 711 #define RENDERINPUTS_ONES BITSET64_ONES
 712 #define RENDERINPUTS_TEST BITSET64_TEST
 713 #define RENDERINPUTS_SET BITSET64_SET
 714 #define RENDERINPUTS_CLEAR BITSET64_CLEAR
 715 #define RENDERINPUTS_TEST_RANGE BITSET64_TEST_RANGE
 716 #define RENDERINPUTS_SET_RANGE BITSET64_SET_RANGE
 717 #define RENDERINPUTS_CLEAR_RANGE BITSET64_CLEAR_RANGE
 718
 719
 720 /**
 721  * Context state for T&L context.
 722  */
 723 typedef struct
 724 {
 725    /* Driver interface.
 726     */
 727    struct tnl_device_driver Driver;
 728
 729    /* Execute:
 730     */
 731    struct tnl_vtx vtx;
 732
 733    /* Compile:
 734     */
 735    struct tnl_save save;
 736
 737    /* Pipeline
 738     */
 739    struct tnl_pipeline pipeline;
 740    struct vertex_buffer vb;
 741
 742    /* GLvectors for binding to vb:
 743     */
 744    struct tnl_vertex_arrays vtx_inputs;
 745    struct tnl_vertex_arrays save_inputs;
 746    struct tnl_vertex_arrays current;
 747    struct tnl_vertex_arrays array_inputs;
 748
 749    /* Clipspace/ndc/window vertex managment:
 750     */
 751    struct tnl_clipspace clipspace;
 752
 753    /* Probably need a better configuration mechanism:
 754     */
 755    GLboolean NeedNdcCoords;
 756    GLboolean LoopbackDListCassettes;
 757    GLboolean CalcDListNormalLengths;
 758    GLboolean IsolateMaterials;
 759    GLboolean AllowVertexFog;
 760    GLboolean AllowPixelFog;
 761    GLboolean AllowCodegen;
 762
 763    GLboolean _DoVertexFog;  /* eval fog function at each vertex? */
 764
 765    /* If True, it means we started a glBegin/End primtive with an invalid
 766     * vertex/fragment program or incomplete framebuffer.  In that case,
 767     * discard any buffered vertex data.
 768     */
 769    GLboolean DiscardPrimitive;
 770
 771    DECLARE_RENDERINPUTS(render_inputs_bitset);
 772
 773    GLvertexformat exec_vtxfmt;
 774    GLvertexformat save_vtxfmt;
 775
 776    struct tnl_cache *vp_cache;
 777
 778 } TNLcontext;
 779
 780
 781
 782 #define TNL_CONTEXT(ctx) ((TNLcontext *)((ctx)->swtnl_context))
 783
 784
 785 #define TYPE_IDX(t) ((t) & 0xf)
 786 #define MAX_TYPES TYPE_IDX(GL_DOUBLE)+1      /* 0xa + 1 */
 787
 788
 789 #endif