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 /*
  87  * Note: The first attributes match the VERT_ATTRIB_* definitions
  88  * in mtypes.h.  However, the tnl module has additional attributes
  89  * for materials, color indexes, edge flags, etc.
  90  */
  91 enum {
  92         _TNL_ATTRIB_POS = 0,
  93         _TNL_ATTRIB_WEIGHT = 1,
  94         _TNL_ATTRIB_NORMAL = 2,
  95         _TNL_ATTRIB_COLOR0 = 3,
  96         _TNL_ATTRIB_COLOR1 = 4,
  97         _TNL_ATTRIB_FOG = 5,
  98         _TNL_ATTRIB_SIX = 6,
  99         _TNL_ATTRIB_SEVEN = 7,
 100         _TNL_ATTRIB_TEX0 = 8,
 101         _TNL_ATTRIB_TEX1 = 9,
 102         _TNL_ATTRIB_TEX2 = 10,
 103         _TNL_ATTRIB_TEX3 = 11,
 104         _TNL_ATTRIB_TEX4 = 12,
 105         _TNL_ATTRIB_TEX5 = 13,
 106         _TNL_ATTRIB_TEX6 = 14,
 107         _TNL_ATTRIB_TEX7 = 15,
 108         _TNL_ATTRIB_MAT_FRONT_AMBIENT = 16,
 109         _TNL_ATTRIB_MAT_BACK_AMBIENT = 17,
 110         _TNL_ATTRIB_MAT_FRONT_DIFFUSE = 18,
 111         _TNL_ATTRIB_MAT_BACK_DIFFUSE = 19,
 112         _TNL_ATTRIB_MAT_FRONT_SPECULAR = 20,
 113         _TNL_ATTRIB_MAT_BACK_SPECULAR = 21,
 114         _TNL_ATTRIB_MAT_FRONT_EMISSION = 22,
 115         _TNL_ATTRIB_MAT_BACK_EMISSION = 23,
 116         _TNL_ATTRIB_MAT_FRONT_SHININESS = 24,
 117         _TNL_ATTRIB_MAT_BACK_SHININESS = 25,
 118         _TNL_ATTRIB_MAT_FRONT_INDEXES = 26,
 119         _TNL_ATTRIB_MAT_BACK_INDEXES = 27,
 120         _TNL_ATTRIB_INDEX = 28,
 121         _TNL_ATTRIB_EDGEFLAG = 29,
 122         _TNL_ATTRIB_MAX = 30
 123 } ;
 124
 125 /* Will probably have to revise this scheme fairly shortly, eg. by
 126  * compacting all the MAT flags down to one bit, or by using two
 127  * dwords to store the flags.
 128  */
 129 #define _TNL_BIT_POS                 (1<<0)
 130 #define _TNL_BIT_WEIGHT              (1<<1)
 131 #define _TNL_BIT_NORMAL              (1<<2)
 132 #define _TNL_BIT_COLOR0              (1<<3)
 133 #define _TNL_BIT_COLOR1              (1<<4)
 134 #define _TNL_BIT_FOG                 (1<<5)
 135 #define _TNL_BIT_SIX                 (1<<6)
 136 #define _TNL_BIT_SEVEN               (1<<7)
 137 #define _TNL_BIT_TEX0                (1<<8)
 138 #define _TNL_BIT_TEX1                (1<<9)
 139 #define _TNL_BIT_TEX2                (1<<10)
 140 #define _TNL_BIT_TEX3                (1<<11)
 141 #define _TNL_BIT_TEX4                (1<<12)
 142 #define _TNL_BIT_TEX5                (1<<13)
 143 #define _TNL_BIT_TEX6                (1<<14)
 144 #define _TNL_BIT_TEX7                (1<<15)
 145 #define _TNL_BIT_MAT_FRONT_AMBIENT   (1<<16)
 146 #define _TNL_BIT_MAT_BACK_AMBIENT    (1<<17)
 147 #define _TNL_BIT_MAT_FRONT_DIFFUSE   (1<<18)
 148 #define _TNL_BIT_MAT_BACK_DIFFUSE    (1<<19)
 149 #define _TNL_BIT_MAT_FRONT_SPECULAR  (1<<20)
 150 #define _TNL_BIT_MAT_BACK_SPECULAR   (1<<21)
 151 #define _TNL_BIT_MAT_FRONT_EMISSION  (1<<22)
 152 #define _TNL_BIT_MAT_BACK_EMISSION   (1<<23)
 153 #define _TNL_BIT_MAT_FRONT_SHININESS (1<<24)
 154 #define _TNL_BIT_MAT_BACK_SHININESS  (1<<25)
 155 #define _TNL_BIT_MAT_FRONT_INDEXES   (1<<26)
 156 #define _TNL_BIT_MAT_BACK_INDEXES    (1<<27)
 157 #define _TNL_BIT_INDEX               (1<<28)
 158 #define _TNL_BIT_EDGEFLAG            (1<<29)
 159
 160 #define _TNL_BIT_TEX(u)  (1 << (_TNL_ATTRIB_TEX0 + (u)))
 161
 162
 163 #define _TNL_BITS_MAT_ANY  (_TNL_BIT_MAT_FRONT_AMBIENT   |      \
 164                             _TNL_BIT_MAT_BACK_AMBIENT    |      \
 165                             _TNL_BIT_MAT_FRONT_DIFFUSE   |      \
 166                             _TNL_BIT_MAT_BACK_DIFFUSE    |      \
 167                             _TNL_BIT_MAT_FRONT_SPECULAR  |      \
 168                             _TNL_BIT_MAT_BACK_SPECULAR   |      \
 169                             _TNL_BIT_MAT_FRONT_EMISSION  |      \
 170                             _TNL_BIT_MAT_BACK_EMISSION   |      \
 171                             _TNL_BIT_MAT_FRONT_SHININESS |      \
 172                             _TNL_BIT_MAT_BACK_SHININESS  |      \
 173                             _TNL_BIT_MAT_FRONT_INDEXES   |      \
 174                             _TNL_BIT_MAT_BACK_INDEXES)
 175
 176
 177 #define _TNL_BITS_TEX_ANY  (_TNL_BIT_TEX0 |     \
 178                             _TNL_BIT_TEX1 |     \
 179                             _TNL_BIT_TEX2 |     \
 180                             _TNL_BIT_TEX3 |     \
 181                             _TNL_BIT_TEX4 |     \
 182                             _TNL_BIT_TEX5 |     \
 183                             _TNL_BIT_TEX6 |     \
 184                             _TNL_BIT_TEX7)
 185
 186
 187 #define _TNL_BITS_PROG_ANY   (_TNL_BIT_POS    |         \
 188                               _TNL_BIT_WEIGHT |         \
 189                               _TNL_BIT_NORMAL |         \
 190                               _TNL_BIT_COLOR0 |         \
 191                               _TNL_BIT_COLOR1 |         \
 192                               _TNL_BIT_FOG    |         \
 193                               _TNL_BIT_SIX    |         \
 194                               _TNL_BIT_SEVEN  |         \
 195                               _TNL_BITS_TEX_ANY)
 196
 197
 198
 199 #define PRIM_BEGIN     0x10
 200 #define PRIM_END       0x20
 201 #define PRIM_WEAK      0x40
 202 #define PRIM_MODE_MASK 0x0f
 203
 204 /*
 205  */
 206 struct tnl_prim {
 207    GLuint mode;
 208    GLuint start;
 209    GLuint count;
 210 };
 211
 212
 213
 214 struct tnl_eval1_map {
 215    struct gl_1d_map *map;
 216    GLuint sz;
 217 };
 218
 219 struct tnl_eval2_map {
 220    struct gl_2d_map *map;
 221    GLuint sz;
 222 };
 223
 224 struct tnl_eval {
 225    GLuint new_state;
 226    struct tnl_eval1_map map1[_TNL_ATTRIB_INDEX + 1];
 227    struct tnl_eval2_map map2[_TNL_ATTRIB_INDEX + 1];
 228 };
 229
 230
 231 #define TNL_MAX_PRIM 16
 232 #define TNL_MAX_COPIED_VERTS 3
 233
 234 struct tnl_copied_vtx {
 235    GLfloat buffer[_TNL_ATTRIB_MAX * 4 * TNL_MAX_COPIED_VERTS];
 236    GLuint nr;
 237 };
 238
 239 #define VERT_BUFFER_SIZE 2048   /* 8kbytes */
 240
 241 typedef void (*attrfv_func)( const GLfloat * );
 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    GLuint counter, initial_counter;
 259    struct tnl_copied_vtx copied;
 260    attrfv_func tabfv[_TNL_ATTRIB_MAX][4];
 261    struct tnl_eval eval;
 262    GLboolean *edgeflag_tmp;
 263    GLboolean have_materials;
 264 };
 265
 266
 267
 268
 269 /* For display lists, this structure holds a run of vertices of the
 270  * same format, and a strictly well-formed set of begin/end pairs,
 271  * starting on the first vertex and ending at the last.  Vertex
 272  * copying on buffer breaks is precomputed according to these
 273  * primitives, though there are situations where the copying will need
 274  * correction at execute-time, perhaps by replaying the list as
 275  * immediate mode commands.
 276  *
 277  * On executing this list, the 'current' values may be updated with
 278  * the values of the final vertex, and often no fixup of the start of
 279  * the vertex list is required.
 280  *
 281  * Eval and other commands that don't fit into these vertex lists are
 282  * compiled using the fallback opcode mechanism provided by dlist.c.
 283  */
 284 struct tnl_vertex_list {
 285    GLubyte attrsz[_TNL_ATTRIB_MAX];
 286    GLuint vertex_size;
 287
 288    GLfloat *buffer;
 289    GLuint count;
 290    GLuint wrap_count;           /* number of copied vertices at start */
 291    GLboolean have_materials;    /* bit of a hack - quick check for materials */
 292    GLboolean dangling_attr_ref; /* current attr implicitly referenced
 293                                    outside the list */
 294
 295    GLfloat *normal_lengths;
 296    struct tnl_prim *prim;
 297    GLuint prim_count;
 298
 299    struct tnl_vertex_store *vertex_store;
 300    struct tnl_primitive_store *prim_store;
 301 };
 302
 303 /* These buffers should be a reasonable size to support upload to
 304  * hardware?  Maybe drivers should stitch them back together, or
 305  * specify a desired size?
 306  */
 307 #define SAVE_BUFFER_SIZE (16*1024)
 308 #define SAVE_PRIM_SIZE   128
 309
 310 /* Storage to be shared among several vertex_lists.
 311  */
 312 struct tnl_vertex_store {
 313    GLfloat buffer[SAVE_BUFFER_SIZE];
 314    GLuint used;
 315    GLuint refcount;
 316 };
 317
 318 struct tnl_primitive_store {
 319    struct tnl_prim buffer[SAVE_PRIM_SIZE];
 320    GLuint used;
 321    GLuint refcount;
 322 };
 323
 324
 325 struct tnl_save {
 326    GLubyte attrsz[_TNL_ATTRIB_MAX];
 327    GLuint vertex_size;
 328
 329    GLfloat *buffer;
 330    GLuint count;
 331    GLuint wrap_count;
 332
 333    struct tnl_prim *prim;
 334    GLuint prim_count, prim_max;
 335
 336    struct tnl_vertex_store *vertex_store;
 337    struct tnl_primitive_store *prim_store;
 338
 339    GLfloat *vbptr;                 /* cursor, points into buffer */
 340    GLfloat vertex[_TNL_ATTRIB_MAX*4];      /* current values */
 341    GLfloat *attrptr[_TNL_ATTRIB_MAX];
 342    GLuint counter, initial_counter;
 343    GLboolean dangling_attr_ref;
 344    GLboolean have_materials;
 345
 346    GLuint opcode_vertex_list;
 347
 348    struct tnl_copied_vtx copied;
 349
 350    GLfloat *current[_TNL_ATTRIB_MAX]; /* points into ctx->ListState */
 351    GLubyte *currentsz[_TNL_ATTRIB_MAX];
 352
 353    void (*tabfv[_TNL_ATTRIB_MAX][4])( const GLfloat * );
 354 };
 355
 356
 357
 358
 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    GLvector4f  Attribs[_TNL_ATTRIB_MAX];
 381 };
 382
 383
 384 /**
 385  * Contains the current state of a running pipeline.
 386  */
 387 struct vertex_buffer
 388 {
 389    /* Constant over life of the vertex_buffer.
 390     */
 391    GLuint      Size;
 392
 393    /* Constant over the pipeline.
 394     */
 395    GLuint      Count;                         /* for everything except Elts */
 396
 397    /* Pointers to current data.
 398     */
 399    GLuint      *Elts;
 400    GLvector4f  *ObjPtr;                         /* _TNL_BIT_POS */
 401    GLvector4f  *EyePtr;                         /* _TNL_BIT_POS */
 402    GLvector4f  *ClipPtr;                        /* _TNL_BIT_POS */
 403    GLvector4f  *NdcPtr;                         /* _TNL_BIT_POS */
 404    GLubyte     ClipOrMask;                      /* _TNL_BIT_POS */
 405    GLubyte     *ClipMask;                       /* _TNL_BIT_POS */
 406    GLvector4f  *NormalPtr;                      /* _TNL_BIT_NORMAL */
 407    GLfloat     *NormalLengthPtr;                /* _TNL_BIT_NORMAL */
 408    GLboolean   *EdgeFlag;                       /* _TNL_BIT_EDGEFLAG */
 409    GLvector4f  *TexCoordPtr[MAX_TEXTURE_COORD_UNITS]; /* VERT_TEX_0..n */
 410    GLvector4f  *IndexPtr[2];                    /* _TNL_BIT_INDEX */
 411    GLvector4f  *ColorPtr[2];                    /* _TNL_BIT_COLOR0 */
 412    GLvector4f  *SecondaryColorPtr[2];           /* _TNL_BIT_COLOR1 */
 413    GLvector4f  *PointSizePtr;                   /* _TNL_BIT_POS */
 414    GLvector4f  *FogCoordPtr;                    /* _TNL_BIT_FOG */
 415
 416    struct tnl_prim  *Primitive;
 417    GLuint      PrimitiveCount;
 418
 419    /* Inputs to the vertex program stage */
 420    GLvector4f *AttribPtr[_TNL_ATTRIB_MAX];      /* GL_NV_vertex_program */
 421
 422    GLuint LastClipped;
 423    /* Private data from _tnl_render_stage that has no business being
 424     * in this struct.
 425     */
 426
 427 };
 428
 429
 430
 431 /** Describes an individual operation on the pipeline.
 432  */
 433 struct tnl_pipeline_stage {
 434    const char *name;
 435    GLuint check_state;          /* All state referenced in check() --
 436                                  * When is the pipeline_stage struct
 437                                  * itself invalidated?  Must be
 438                                  * constant.
 439                                  */
 440
 441    /* Usually constant or set by the 'check' callback:
 442     */
 443    GLuint run_state;            /* All state referenced in run() --
 444                                  * When is the cached output of the
 445                                  * stage invalidated?
 446                                  */
 447
 448    GLboolean active;            /* True if runnable in current state */
 449    GLuint inputs;               /* VERT_* inputs to the stage */
 450    GLuint outputs;              /* VERT_* outputs of the stage */
 451
 452    /* Set in _tnl_run_pipeline():
 453     */
 454    GLuint changed_inputs;       /* Generated value -- inputs to the
 455                                  * stage that have changed since last
 456                                  * call to 'run'.
 457                                  */
 458
 459    /* Private data for the pipeline stage:
 460     */
 461    void *privatePtr;
 462
 463    /* Free private data.  May not be null.
 464     */
 465    void (*destroy)( struct tnl_pipeline_stage * );
 466
 467    /* Called from _tnl_validate_pipeline().  Must update all fields in
 468     * the pipeline_stage struct for the current state.
 469     */
 470    void (*check)( GLcontext *ctx, struct tnl_pipeline_stage * );
 471
 472    /* Called from _tnl_run_pipeline().  The stage.changed_inputs value
 473     * encodes all inputs to thee struct which have changed.  If
 474     * non-zero, recompute all affected outputs of the stage, otherwise
 475     * execute any 'sideeffects' of the stage.
 476     *
 477     * Return value: GL_TRUE - keep going
 478     *               GL_FALSE - finished pipeline
 479     */
 480    GLboolean (*run)( GLcontext *ctx, struct tnl_pipeline_stage * );
 481 };
 482
 483 /** Contains the array of all pipeline stages.
 484  * The default values are defined at the end of t_pipeline.c */
 485 struct tnl_pipeline {
 486    GLuint build_state_trigger;    /**< state changes which require build */
 487    GLuint build_state_changes;    /**< state changes since last build */
 488    GLuint run_state_changes;      /**< state changes since last run */
 489    GLuint run_input_changes;      /**< VERT_* changes since last run */
 490    GLuint inputs;                 /**< VERT_* inputs to pipeline */
 491    /** This array has to end with a NULL-pointer. */
 492    struct tnl_pipeline_stage stages[MAX_PIPELINE_STAGES+1];
 493    GLuint nr_stages;
 494 };
 495
 496
 497
 498
 499 typedef void (*points_func)( GLcontext *ctx, GLuint first, GLuint last );
 500 typedef void (*line_func)( GLcontext *ctx, GLuint v1, GLuint v2 );
 501 typedef void (*triangle_func)( GLcontext *ctx,
 502                                GLuint v1, GLuint v2, GLuint v3 );
 503 typedef void (*quad_func)( GLcontext *ctx, GLuint v1, GLuint v2,
 504                            GLuint v3, GLuint v4 );
 505 typedef void (*render_func)( GLcontext *ctx, GLuint start, GLuint count,
 506                              GLuint flags );
 507 typedef void (*interp_func)( GLcontext *ctx,
 508                              GLfloat t, GLuint dst, GLuint out, GLuint in,
 509                              GLboolean force_boundary );
 510 typedef void (*copy_pv_func)( GLcontext *ctx, GLuint dst, GLuint src );
 511 typedef void (*setup_func)( GLcontext *ctx,
 512                             GLuint start, GLuint end,
 513                             GLuint new_inputs);
 514
 515
 516 struct tnl_device_driver {
 517    /***
 518     *** TNL Pipeline
 519     ***/
 520
 521    void (*RunPipeline)(GLcontext *ctx);
 522    /* Replaces PipelineStart/PipelineFinish -- intended to allow
 523     * drivers to wrap _tnl_run_pipeline() with code to validate state
 524     * and grab/release hardware locks.
 525     */
 526
 527    void (*NotifyMaterialChange)(GLcontext *ctx);
 528    /* Alert tnl-aware drivers of changes to material.
 529     */
 530
 531    GLboolean (*NotifyBegin)(GLcontext *ctx, GLenum p);
 532    /* Allow drivers to hook in optimized begin/end engines.
 533     * Return value:  GL_TRUE - driver handled the begin
 534     *                GL_FALSE - driver didn't handle the begin
 535     */
 536
 537    /***
 538     *** Rendering -- These functions called only from t_vb_render.c
 539     ***/
 540    struct {
 541       void (*Start)(GLcontext *ctx);
 542       void (*Finish)(GLcontext *ctx);
 543       /* Called before and after all rendering operations, including DrawPixels,
 544        * ReadPixels, Bitmap, span functions, and CopyTexImage, etc commands.
 545        * These are a suitable place for grabbing/releasing hardware locks.
 546        */
 547
 548       void (*PrimitiveNotify)(GLcontext *ctx, GLenum mode);
 549       /* Called between RenderStart() and RenderFinish() to indicate the
 550        * type of primitive we're about to draw.  Mode will be one of the
 551        * modes accepted by glBegin().
 552        */
 553
 554       interp_func Interp;
 555       /* The interp function is called by the clipping routines when we need
 556        * to generate an interpolated vertex.  All pertinant vertex ancilliary
 557        * data should be computed by interpolating between the 'in' and 'out'
 558        * vertices.
 559        */
 560
 561       copy_pv_func CopyPV;
 562       /* The copy function is used to make a copy of a vertex.  All pertinant
 563        * vertex attributes should be copied.
 564        */
 565
 566       void (*ClippedPolygon)( GLcontext *ctx, const GLuint *elts, GLuint n );
 567       /* Render a polygon with <n> vertices whose indexes are in the <elts>
 568        * array.
 569        */
 570
 571       void (*ClippedLine)( GLcontext *ctx, GLuint v0, GLuint v1 );
 572       /* Render a line between the two vertices given by indexes v0 and v1. */
 573
 574       points_func           Points; /* must now respect vb->elts */
 575       line_func             Line;
 576       triangle_func         Triangle;
 577       quad_func             Quad;
 578       /* These functions are called in order to render points, lines,
 579        * triangles and quads.  These are only called via the T&L module.
 580        */
 581
 582       render_func          *PrimTabVerts;
 583       render_func          *PrimTabElts;
 584       /* Render whole unclipped primitives (points, lines, linestrips,
 585        * lineloops, etc).  The tables are indexed by the GL enum of the
 586        * primitive to be rendered.  RenderTabVerts is used for non-indexed
 587        * arrays of vertices.  RenderTabElts is used for indexed arrays of
 588        * vertices.
 589        */
 590
 591       void (*ResetLineStipple)( GLcontext *ctx );
 592       /* Reset the hardware's line stipple counter.
 593        */
 594
 595       setup_func BuildVertices;
 596       /* This function is called whenever new vertices are required for
 597        * rendering.  The vertices in question are those n such that start
 598        * <= n < end.  The new_inputs parameter indicates those fields of
 599        * the vertex which need to be updated, if only a partial repair of
 600        * the vertex is required.
 601        *
 602        * This function is called only from _tnl_render_stage in tnl/t_render.c.
 603        */
 604
 605
 606       GLboolean (*Multipass)( GLcontext *ctx, GLuint passno );
 607       /* Driver may request additional render passes by returning GL_TRUE
 608        * when this function is called.  This function will be called
 609        * after the first pass, and passes will be made until the function
 610        * returns GL_FALSE.  If no function is registered, only one pass
 611        * is made.
 612        *
 613        * This function will be first invoked with passno == 1.
 614        */
 615    } Render;
 616 };
 617
 618
 619 typedef struct {
 620
 621    /* Driver interface.
 622     */
 623    struct tnl_device_driver Driver;
 624
 625    /* Execute:
 626     */
 627    struct tnl_vtx vtx;
 628
 629    /* Compile:
 630     */
 631    struct tnl_save save;
 632
 633    /* Pipeline
 634     */
 635    struct tnl_pipeline pipeline;
 636    struct vertex_buffer vb;
 637
 638    /* GLvectors for binding to vb:
 639     */
 640    struct tnl_vertex_arrays vtx_inputs;
 641    struct tnl_vertex_arrays save_inputs;
 642    struct tnl_vertex_arrays current;
 643    struct tnl_vertex_arrays array_inputs;
 644
 645
 646    /* Probably need a better configuration mechanism:
 647     */
 648    GLboolean NeedNdcCoords;
 649    GLboolean LoopbackDListCassettes;
 650    GLboolean CalcDListNormalLengths;
 651    GLboolean IsolateMaterials;
 652
 653
 654    GLvertexformat exec_vtxfmt;
 655    GLvertexformat save_vtxfmt;
 656
 657 } TNLcontext;
 658
 659
 660
 661 #define TNL_CONTEXT(ctx) ((TNLcontext *)(ctx->swtnl_context))
 662
 663
 664 #define TYPE_IDX(t) ((t) & 0xf)
 665 #define MAX_TYPES TYPE_IDX(GL_DOUBLE)+1      /* 0xa + 1 */
 666
 667 extern void _tnl_MakeCurrent( GLcontext *ctx,
 668                               GLframebuffer *drawBuffer,
 669                               GLframebuffer *readBuffer );
 670
 671
 672
 673
 674 #endif