src/mesa/tnl/t_context.h

   1 /*
   2  * mesa 3-D graphics library
   3  * Version:  5.1
   4  *
   5  * Copyright (C) 1999-2003  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 enum {
  87         _TNL_ATTRIB_POS = 0,
  88         _TNL_ATTRIB_WEIGHT = 1,
  89         _TNL_ATTRIB_NORMAL = 2,
  90         _TNL_ATTRIB_COLOR0 = 3,
  91         _TNL_ATTRIB_COLOR1 = 4,
  92         _TNL_ATTRIB_FOG = 5,
  93         _TNL_ATTRIB_SIX = 6,
  94         _TNL_ATTRIB_SEVEN = 7,
  95         _TNL_ATTRIB_TEX0 = 8,
  96         _TNL_ATTRIB_TEX1 = 9,
  97         _TNL_ATTRIB_TEX2 = 10,
  98         _TNL_ATTRIB_TEX3 = 11,
  99         _TNL_ATTRIB_TEX4 = 12,
 100         _TNL_ATTRIB_TEX5 = 13,
 101         _TNL_ATTRIB_TEX6 = 14,
 102         _TNL_ATTRIB_TEX7 = 15,
 103         _TNL_ATTRIB_MAT_FRONT_AMBIENT = 16,
 104         _TNL_ATTRIB_MAT_BACK_AMBIENT = 17,
 105         _TNL_ATTRIB_MAT_FRONT_DIFFUSE = 18,
 106         _TNL_ATTRIB_MAT_BACK_DIFFUSE = 19,
 107         _TNL_ATTRIB_MAT_FRONT_SPECULAR = 20,
 108         _TNL_ATTRIB_MAT_BACK_SPECULAR = 21,
 109         _TNL_ATTRIB_MAT_FRONT_EMISSION = 22,
 110         _TNL_ATTRIB_MAT_BACK_EMISSION = 23,
 111         _TNL_ATTRIB_MAT_FRONT_SHININESS = 24,
 112         _TNL_ATTRIB_MAT_BACK_SHININESS = 25,
 113         _TNL_ATTRIB_MAT_FRONT_INDEXES = 26,
 114         _TNL_ATTRIB_MAT_BACK_INDEXES = 27,
 115         _TNL_ATTRIB_INDEX = 28,
 116         _TNL_ATTRIB_EDGEFLAG = 29,
 117         _TNL_ATTRIB_MAX = 30
 118 } ;
 119
 120 /* Will probably have to revise this scheme fairly shortly, eg. by
 121  * compacting all the MAT flags down to one bit, or by using two
 122  * dwords to store the flags.
 123  */
 124 #define _TNL_BIT_POS                 (1<<0)
 125 #define _TNL_BIT_WEIGHT              (1<<1)
 126 #define _TNL_BIT_NORMAL              (1<<2)
 127 #define _TNL_BIT_COLOR0              (1<<3)
 128 #define _TNL_BIT_COLOR1              (1<<4)
 129 #define _TNL_BIT_FOG                 (1<<5)
 130 #define _TNL_BIT_SIX                 (1<<6)
 131 #define _TNL_BIT_SEVEN               (1<<7)
 132 #define _TNL_BIT_TEX0                (1<<8)
 133 #define _TNL_BIT_TEX1                (1<<9)
 134 #define _TNL_BIT_TEX2                (1<<10)
 135 #define _TNL_BIT_TEX3                (1<<11)
 136 #define _TNL_BIT_TEX4                (1<<12)
 137 #define _TNL_BIT_TEX5                (1<<13)
 138 #define _TNL_BIT_TEX6                (1<<14)
 139 #define _TNL_BIT_TEX7                (1<<15)
 140 #define _TNL_BIT_MAT_FRONT_AMBIENT   (1<<16)
 141 #define _TNL_BIT_MAT_BACK_AMBIENT    (1<<17)
 142 #define _TNL_BIT_MAT_FRONT_DIFFUSE   (1<<18)
 143 #define _TNL_BIT_MAT_BACK_DIFFUSE    (1<<19)
 144 #define _TNL_BIT_MAT_FRONT_SPECULAR  (1<<20)
 145 #define _TNL_BIT_MAT_BACK_SPECULAR   (1<<21)
 146 #define _TNL_BIT_MAT_FRONT_EMISSION  (1<<22)
 147 #define _TNL_BIT_MAT_BACK_EMISSION   (1<<23)
 148 #define _TNL_BIT_MAT_FRONT_SHININESS (1<<24)
 149 #define _TNL_BIT_MAT_BACK_SHININESS  (1<<25)
 150 #define _TNL_BIT_MAT_FRONT_INDEXES   (1<<26)
 151 #define _TNL_BIT_MAT_BACK_INDEXES    (1<<27)
 152 #define _TNL_BIT_INDEX               (1<<28)
 153 #define _TNL_BIT_EDGEFLAG            (1<<29)
 154
 155 #define _TNL_BIT_TEX(u)  (1 << (_TNL_ATTRIB_TEX0 + (u)))
 156
 157
 158 #define _TNL_BITS_MAT_ANY  (_TNL_BIT_MAT_FRONT_AMBIENT   |      \
 159                             _TNL_BIT_MAT_BACK_AMBIENT    |      \
 160                             _TNL_BIT_MAT_FRONT_DIFFUSE   |      \
 161                             _TNL_BIT_MAT_BACK_DIFFUSE    |      \
 162                             _TNL_BIT_MAT_FRONT_SPECULAR  |      \
 163                             _TNL_BIT_MAT_BACK_SPECULAR   |      \
 164                             _TNL_BIT_MAT_FRONT_EMISSION  |      \
 165                             _TNL_BIT_MAT_BACK_EMISSION   |      \
 166                             _TNL_BIT_MAT_FRONT_SHININESS |      \
 167                             _TNL_BIT_MAT_BACK_SHININESS  |      \
 168                             _TNL_BIT_MAT_FRONT_INDEXES   |      \
 169                             _TNL_BIT_MAT_BACK_INDEXES)
 170
 171
 172 #define _TNL_BITS_TEX_ANY  (_TNL_BIT_TEX0 |     \
 173                             _TNL_BIT_TEX1 |     \
 174                             _TNL_BIT_TEX2 |     \
 175                             _TNL_BIT_TEX3 |     \
 176                             _TNL_BIT_TEX4 |     \
 177                             _TNL_BIT_TEX5 |     \
 178                             _TNL_BIT_TEX6 |     \
 179                             _TNL_BIT_TEX7)
 180
 181
 182 #define _TNL_BITS_PROG_ANY   (_TNL_BIT_POS    |         \
 183                               _TNL_BIT_WEIGHT |         \
 184                               _TNL_BIT_NORMAL |         \
 185                               _TNL_BIT_COLOR0 |         \
 186                               _TNL_BIT_COLOR1 |         \
 187                               _TNL_BIT_FOG    |         \
 188                               _TNL_BIT_SIX    |         \
 189                               _TNL_BIT_SEVEN  |         \
 190                               _TNL_BITS_TEX_ANY)
 191
 192
 193
 194 #define PRIM_BEGIN     0x10
 195 #define PRIM_END       0x20
 196 #define PRIM_WEAK      0x40
 197 #define PRIM_MODE_MASK 0x0f
 198
 199 /*
 200  */
 201 struct tnl_prim {
 202    GLuint mode;
 203    GLuint start;
 204    GLuint count;
 205 };
 206
 207
 208
 209 struct tnl_eval1_map {
 210    struct gl_1d_map *map;
 211    GLuint sz;
 212 };
 213
 214 struct tnl_eval2_map {
 215    struct gl_2d_map *map;
 216    GLuint sz;
 217 };
 218
 219 struct tnl_eval {
 220    GLuint new_state;
 221    struct tnl_eval1_map map1[_TNL_ATTRIB_INDEX + 1];
 222    struct tnl_eval2_map map2[_TNL_ATTRIB_INDEX + 1];
 223 };
 224
 225
 226 #define TNL_MAX_PRIM 16
 227 #define TNL_MAX_COPIED_VERTS 3
 228
 229 struct tnl_copied_vtx {
 230    GLfloat buffer[_TNL_ATTRIB_MAX * 4 * TNL_MAX_COPIED_VERTS];
 231    GLuint nr;
 232 };
 233
 234 #define VERT_BUFFER_SIZE 2048   /* 8kbytes */
 235
 236 typedef void (*attrfv_func)( const GLfloat * );
 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    GLuint counter, initial_counter;
 254    struct tnl_copied_vtx copied;
 255    attrfv_func tabfv[_TNL_ATTRIB_MAX][4];
 256    struct tnl_eval eval;
 257    GLboolean *edgeflag_tmp;
 258    GLboolean have_materials;
 259 };
 260
 261
 262
 263
 264 /* For display lists, this structure holds a run of vertices of the
 265  * same format, and a strictly well-formed set of begin/end pairs,
 266  * starting on the first vertex and ending at the last.  Vertex
 267  * copying on buffer breaks is precomputed according to these
 268  * primitives, though there are situations where the copying will need
 269  * correction at execute-time, perhaps by replaying the list as
 270  * immediate mode commands.
 271  *
 272  * On executing this list, the 'current' values may be updated with
 273  * the values of the final vertex, and often no fixup of the start of
 274  * the vertex list is required.
 275  *
 276  * Eval and other commands that don't fit into these vertex lists are
 277  * compiled using the fallback opcode mechanism provided by dlist.c.
 278  */
 279 struct tnl_vertex_list {
 280    GLubyte attrsz[_TNL_ATTRIB_MAX];
 281    GLuint vertex_size;
 282
 283    GLfloat *buffer;
 284    GLuint count;
 285    GLuint wrap_count;           /* number of copied vertices at start */
 286    GLboolean have_materials;    /* bit of a hack - quick check for materials */
 287    GLboolean dangling_attr_ref; /* current attr implicitly referenced
 288                                    outside the list */
 289
 290    GLfloat *normal_lengths;
 291    struct tnl_prim *prim;
 292    GLuint prim_count;
 293
 294    struct tnl_vertex_store *vertex_store;
 295    struct tnl_primitive_store *prim_store;
 296 };
 297
 298 /* These buffers should be a reasonable size to support upload to
 299  * hardware?  Maybe drivers should stitch them back together, or
 300  * specify a desired size?
 301  */
 302 #define SAVE_BUFFER_SIZE (16*1024)
 303 #define SAVE_PRIM_SIZE   128
 304
 305 /* Storage to be shared among several vertex_lists.
 306  */
 307 struct tnl_vertex_store {
 308    GLfloat buffer[SAVE_BUFFER_SIZE];
 309    GLuint used;
 310    GLuint refcount;
 311 };
 312
 313 struct tnl_primitive_store {
 314    struct tnl_prim buffer[SAVE_PRIM_SIZE];
 315    GLuint used;
 316    GLuint refcount;
 317 };
 318
 319
 320 struct tnl_save {
 321    GLubyte attrsz[_TNL_ATTRIB_MAX];
 322    GLuint vertex_size;
 323
 324    GLfloat *buffer;
 325    GLuint count;
 326    GLuint wrap_count;
 327
 328    struct tnl_prim *prim;
 329    GLuint prim_count, prim_max;
 330
 331    struct tnl_vertex_store *vertex_store;
 332    struct tnl_primitive_store *prim_store;
 333
 334    GLfloat *vbptr;                 /* cursor, points into buffer */
 335    GLfloat vertex[_TNL_ATTRIB_MAX*4];      /* current values */
 336    GLfloat *attrptr[_TNL_ATTRIB_MAX];
 337    GLuint counter, initial_counter;
 338    GLboolean dangling_attr_ref;
 339    GLboolean have_materials;
 340
 341    GLuint opcode_vertex_list;
 342
 343    struct tnl_copied_vtx copied;
 344
 345    GLfloat *current[_TNL_ATTRIB_MAX]; /* points into ctx->ListState */
 346    GLubyte *currentsz[_TNL_ATTRIB_MAX];
 347
 348    void (*tabfv[_TNL_ATTRIB_MAX][4])( const GLfloat * );
 349 };
 350
 351
 352
 353
 354
 355
 356
 357 struct tnl_vertex_arrays
 358 {
 359    /* Conventional vertex attribute arrays */
 360    GLvector4f  Obj;
 361    GLvector4f  Normal;
 362    GLvector4f  Color;
 363    GLvector4f  SecondaryColor;
 364    GLvector4f  FogCoord;
 365    GLvector4f  TexCoord[MAX_TEXTURE_COORD_UNITS];
 366    GLvector4f  Index;
 367
 368    GLubyte     *EdgeFlag;
 369    GLuint      *Elt;
 370
 371    /* These attributes don't alias with the conventional attributes.
 372     * The GL_NV_vertex_program extension defines 16 extra sets of vertex
 373     * arrays which have precedent over the conventional arrays when enabled.
 374     */
 375    GLvector4f  Attribs[_TNL_ATTRIB_MAX];
 376 };
 377
 378
 379 /**
 380  * Contains the current state of a running pipeline.
 381  */
 382 struct vertex_buffer
 383 {
 384    /* Constant over life of the vertex_buffer.
 385     */
 386    GLuint      Size;
 387
 388    /* Constant over the pipeline.
 389     */
 390    GLuint      Count;                         /* for everything except Elts */
 391
 392    /* Pointers to current data.
 393     */
 394    GLuint      *Elts;
 395    GLvector4f  *ObjPtr;                         /* _TNL_BIT_POS */
 396    GLvector4f  *EyePtr;                         /* _TNL_BIT_POS */
 397    GLvector4f  *ClipPtr;                        /* _TNL_BIT_POS */
 398    GLvector4f  *NdcPtr;                         /* _TNL_BIT_POS */
 399    GLubyte     ClipOrMask;                      /* _TNL_BIT_POS */
 400    GLubyte     *ClipMask;                       /* _TNL_BIT_POS */
 401    GLvector4f  *NormalPtr;                      /* _TNL_BIT_NORMAL */
 402    GLfloat     *NormalLengthPtr;                /* _TNL_BIT_NORMAL */
 403    GLboolean   *EdgeFlag;                       /* _TNL_BIT_EDGEFLAG */
 404    GLvector4f  *TexCoordPtr[MAX_TEXTURE_COORD_UNITS]; /* VERT_TEX_0..n */
 405    GLvector4f  *IndexPtr[2];                    /* _TNL_BIT_INDEX */
 406    GLvector4f  *ColorPtr[2];                    /* _TNL_BIT_COLOR0 */
 407    GLvector4f  *SecondaryColorPtr[2];           /* _TNL_BIT_COLOR1 */
 408    GLvector4f  *PointSizePtr;                   /* _TNL_BIT_POS */
 409    GLvector4f  *FogCoordPtr;                    /* _TNL_BIT_FOG */
 410
 411    struct tnl_prim  *Primitive;
 412    GLuint      PrimitiveCount;
 413
 414    /* Inputs to the vertex program stage */
 415    GLvector4f *AttribPtr[_TNL_ATTRIB_MAX];      /* GL_NV_vertex_program */
 416
 417    GLuint LastClipped;
 418    /* Private data from _tnl_render_stage that has no business being
 419     * in this struct.
 420     */
 421
 422 };
 423
 424
 425
 426 /** Describes an individual operation on the pipeline.
 427  */
 428 struct tnl_pipeline_stage {
 429    const char *name;
 430    GLuint check_state;          /* All state referenced in check() --
 431                                  * When is the pipeline_stage struct
 432                                  * itself invalidated?  Must be
 433                                  * constant.
 434                                  */
 435
 436    /* Usually constant or set by the 'check' callback:
 437     */
 438    GLuint run_state;            /* All state referenced in run() --
 439                                  * When is the cached output of the
 440                                  * stage invalidated?
 441                                  */
 442
 443    GLboolean active;            /* True if runnable in current state */
 444    GLuint inputs;               /* VERT_* inputs to the stage */
 445    GLuint outputs;              /* VERT_* outputs of the stage */
 446
 447    /* Set in _tnl_run_pipeline():
 448     */
 449    GLuint changed_inputs;       /* Generated value -- inputs to the
 450                                  * stage that have changed since last
 451                                  * call to 'run'.
 452                                  */
 453
 454    /* Private data for the pipeline stage:
 455     */
 456    void *privatePtr;
 457
 458    /* Free private data.  May not be null.
 459     */
 460    void (*destroy)( struct tnl_pipeline_stage * );
 461
 462    /* Called from _tnl_validate_pipeline().  Must update all fields in
 463     * the pipeline_stage struct for the current state.
 464     */
 465    void (*check)( GLcontext *ctx, struct tnl_pipeline_stage * );
 466
 467    /* Called from _tnl_run_pipeline().  The stage.changed_inputs value
 468     * encodes all inputs to thee struct which have changed.  If
 469     * non-zero, recompute all affected outputs of the stage, otherwise
 470     * execute any 'sideeffects' of the stage.
 471     *
 472     * Return value: GL_TRUE - keep going
 473     *               GL_FALSE - finished pipeline
 474     */
 475    GLboolean (*run)( GLcontext *ctx, struct tnl_pipeline_stage * );
 476 };
 477
 478 /** Contains the array of all pipeline stages.
 479  * The default values are defined at the end of t_pipeline.c */
 480 struct tnl_pipeline {
 481    GLuint build_state_trigger;    /**< state changes which require build */
 482    GLuint build_state_changes;    /**< state changes since last build */
 483    GLuint run_state_changes;      /**< state changes since last run */
 484    GLuint run_input_changes;      /**< VERT_* changes since last run */
 485    GLuint inputs;                 /**< VERT_* inputs to pipeline */
 486    /** This array has to end with a NULL-pointer. */
 487    struct tnl_pipeline_stage stages[MAX_PIPELINE_STAGES+1];
 488    GLuint nr_stages;
 489 };
 490
 491
 492
 493
 494 typedef void (*points_func)( GLcontext *ctx, GLuint first, GLuint last );
 495 typedef void (*line_func)( GLcontext *ctx, GLuint v1, GLuint v2 );
 496 typedef void (*triangle_func)( GLcontext *ctx,
 497                                GLuint v1, GLuint v2, GLuint v3 );
 498 typedef void (*quad_func)( GLcontext *ctx, GLuint v1, GLuint v2,
 499                            GLuint v3, GLuint v4 );
 500 typedef void (*render_func)( GLcontext *ctx, GLuint start, GLuint count,
 501                              GLuint flags );
 502 typedef void (*interp_func)( GLcontext *ctx,
 503                              GLfloat t, GLuint dst, GLuint out, GLuint in,
 504                              GLboolean force_boundary );
 505 typedef void (*copy_pv_func)( GLcontext *ctx, GLuint dst, GLuint src );
 506 typedef void (*setup_func)( GLcontext *ctx,
 507                             GLuint start, GLuint end,
 508                             GLuint new_inputs);
 509
 510
 511 struct tnl_device_driver {
 512    /***
 513     *** TNL Pipeline
 514     ***/
 515
 516    void (*RunPipeline)(GLcontext *ctx);
 517    /* Replaces PipelineStart/PipelineFinish -- intended to allow
 518     * drivers to wrap _tnl_run_pipeline() with code to validate state
 519     * and grab/release hardware locks.
 520     */
 521
 522    void (*NotifyMaterialChange)(GLcontext *ctx);
 523    /* Alert tnl-aware drivers of changes to material.
 524     */
 525
 526    GLboolean (*NotifyBegin)(GLcontext *ctx, GLenum p);
 527    /* Allow drivers to hook in optimized begin/end engines.
 528     * Return value:  GL_TRUE - driver handled the begin
 529     *                GL_FALSE - driver didn't handle the begin
 530     */
 531
 532    /***
 533     *** Rendering -- These functions called only from t_vb_render.c
 534     ***/
 535    struct {
 536       void (*Start)(GLcontext *ctx);
 537       void (*Finish)(GLcontext *ctx);
 538       /* Called before and after all rendering operations, including DrawPixels,
 539        * ReadPixels, Bitmap, span functions, and CopyTexImage, etc commands.
 540        * These are a suitable place for grabbing/releasing hardware locks.
 541        */
 542
 543       void (*PrimitiveNotify)(GLcontext *ctx, GLenum mode);
 544       /* Called between RenderStart() and RenderFinish() to indicate the
 545        * type of primitive we're about to draw.  Mode will be one of the
 546        * modes accepted by glBegin().
 547        */
 548
 549       interp_func Interp;
 550       /* The interp function is called by the clipping routines when we need
 551        * to generate an interpolated vertex.  All pertinant vertex ancilliary
 552        * data should be computed by interpolating between the 'in' and 'out'
 553        * vertices.
 554        */
 555
 556       copy_pv_func CopyPV;
 557       /* The copy function is used to make a copy of a vertex.  All pertinant
 558        * vertex attributes should be copied.
 559        */
 560
 561       void (*ClippedPolygon)( GLcontext *ctx, const GLuint *elts, GLuint n );
 562       /* Render a polygon with <n> vertices whose indexes are in the <elts>
 563        * array.
 564        */
 565
 566       void (*ClippedLine)( GLcontext *ctx, GLuint v0, GLuint v1 );
 567       /* Render a line between the two vertices given by indexes v0 and v1. */
 568
 569       points_func           Points; /* must now respect vb->elts */
 570       line_func             Line;
 571       triangle_func         Triangle;
 572       quad_func             Quad;
 573       /* These functions are called in order to render points, lines,
 574        * triangles and quads.  These are only called via the T&L module.
 575        */
 576
 577       render_func          *PrimTabVerts;
 578       render_func          *PrimTabElts;
 579       /* Render whole unclipped primitives (points, lines, linestrips,
 580        * lineloops, etc).  The tables are indexed by the GL enum of the
 581        * primitive to be rendered.  RenderTabVerts is used for non-indexed
 582        * arrays of vertices.  RenderTabElts is used for indexed arrays of
 583        * vertices.
 584        */
 585
 586       void (*ResetLineStipple)( GLcontext *ctx );
 587       /* Reset the hardware's line stipple counter.
 588        */
 589
 590       setup_func BuildVertices;
 591       /* This function is called whenever new vertices are required for
 592        * rendering.  The vertices in question are those n such that start
 593        * <= n < end.  The new_inputs parameter indicates those fields of
 594        * the vertex which need to be updated, if only a partial repair of
 595        * the vertex is required.
 596        *
 597        * This function is called only from _tnl_render_stage in tnl/t_render.c.
 598        */
 599
 600
 601       GLboolean (*Multipass)( GLcontext *ctx, GLuint passno );
 602       /* Driver may request additional render passes by returning GL_TRUE
 603        * when this function is called.  This function will be called
 604        * after the first pass, and passes will be made until the function
 605        * returns GL_FALSE.  If no function is registered, only one pass
 606        * is made.
 607        *
 608        * This function will be first invoked with passno == 1.
 609        */
 610    } Render;
 611 };
 612
 613
 614 typedef struct {
 615
 616    /* Driver interface.
 617     */
 618    struct tnl_device_driver Driver;
 619
 620    /* Execute:
 621     */
 622    struct tnl_vtx vtx;
 623
 624    /* Compile:
 625     */
 626    struct tnl_save save;
 627
 628    /* Pipeline
 629     */
 630    struct tnl_pipeline pipeline;
 631    struct vertex_buffer vb;
 632
 633    /* GLvectors for binding to vb:
 634     */
 635    struct tnl_vertex_arrays vtx_inputs;
 636    struct tnl_vertex_arrays save_inputs;
 637    struct tnl_vertex_arrays current;
 638    struct tnl_vertex_arrays array_inputs;
 639
 640
 641    /* Probably need a better configuration mechanism:
 642     */
 643    GLboolean NeedNdcCoords;
 644    GLboolean LoopbackDListCassettes;
 645    GLboolean CalcDListNormalLengths;
 646    GLboolean IsolateMaterials;
 647
 648
 649    GLvertexformat exec_vtxfmt;
 650    GLvertexformat save_vtxfmt;
 651
 652 } TNLcontext;
 653
 654
 655
 656 #define TNL_CONTEXT(ctx) ((TNLcontext *)(ctx->swtnl_context))
 657
 658
 659 #define TYPE_IDX(t) ((t) & 0xf)
 660 #define MAX_TYPES TYPE_IDX(GL_DOUBLE)+1      /* 0xa + 1 */
 661
 662 extern void _tnl_MakeCurrent( GLcontext *ctx,
 663                               GLframebuffer *drawBuffer,
 664                               GLframebuffer *readBuffer );
 665
 666
 667
 668
 669 #endif