src/mesa/tnl/t_context.h

   1 /*
   2  * mesa 3-D graphics library
   3  * Version:  6.3
   4  *
   5  * Copyright (C) 1999-2005  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 enum {
  96         _TNL_ATTRIB_POS = 0,
  97         _TNL_ATTRIB_WEIGHT = 1,
  98         _TNL_ATTRIB_NORMAL = 2,
  99         _TNL_ATTRIB_COLOR0 = 3,
 100         _TNL_ATTRIB_COLOR1 = 4,
 101         _TNL_ATTRIB_FOG = 5,
 102         _TNL_ATTRIB_SIX = 6,
 103         _TNL_ATTRIB_SEVEN = 7,
 104         _TNL_ATTRIB_TEX0 = 8,
 105         _TNL_ATTRIB_TEX1 = 9,
 106         _TNL_ATTRIB_TEX2 = 10,
 107         _TNL_ATTRIB_TEX3 = 11,
 108         _TNL_ATTRIB_TEX4 = 12,
 109         _TNL_ATTRIB_TEX5 = 13,
 110         _TNL_ATTRIB_TEX6 = 14,
 111         _TNL_ATTRIB_TEX7 = 15,
 112         _TNL_ATTRIB_MAT_FRONT_AMBIENT = 16,
 113         _TNL_ATTRIB_MAT_BACK_AMBIENT = 17,
 114         _TNL_ATTRIB_MAT_FRONT_DIFFUSE = 18,
 115         _TNL_ATTRIB_MAT_BACK_DIFFUSE = 19,
 116         _TNL_ATTRIB_MAT_FRONT_SPECULAR = 20,
 117         _TNL_ATTRIB_MAT_BACK_SPECULAR = 21,
 118         _TNL_ATTRIB_MAT_FRONT_EMISSION = 22,
 119         _TNL_ATTRIB_MAT_BACK_EMISSION = 23,
 120         _TNL_ATTRIB_MAT_FRONT_SHININESS = 24,
 121         _TNL_ATTRIB_MAT_BACK_SHININESS = 25,
 122         _TNL_ATTRIB_MAT_FRONT_INDEXES = 26,
 123         _TNL_ATTRIB_MAT_BACK_INDEXES = 27,
 124         _TNL_ATTRIB_INDEX = 28,
 125         _TNL_ATTRIB_EDGEFLAG = 29,
 126         _TNL_ATTRIB_POINTSIZE = 30,
 127         _TNL_ATTRIB_MAX = 31
 128 } ;
 129
 130 /* Will probably have to revise this scheme fairly shortly, eg. by
 131  * compacting all the MAT flags down to one bit, or by using two
 132  * dwords to store the flags.
 133  */
 134 #define _TNL_BIT_POS                 (1<<0)
 135 #define _TNL_BIT_WEIGHT              (1<<1)
 136 #define _TNL_BIT_NORMAL              (1<<2)
 137 #define _TNL_BIT_COLOR0              (1<<3)
 138 #define _TNL_BIT_COLOR1              (1<<4)
 139 #define _TNL_BIT_FOG                 (1<<5)
 140 #define _TNL_BIT_SIX                 (1<<6)
 141 #define _TNL_BIT_SEVEN               (1<<7)
 142 #define _TNL_BIT_TEX0                (1<<8)
 143 #define _TNL_BIT_TEX1                (1<<9)
 144 #define _TNL_BIT_TEX2                (1<<10)
 145 #define _TNL_BIT_TEX3                (1<<11)
 146 #define _TNL_BIT_TEX4                (1<<12)
 147 #define _TNL_BIT_TEX5                (1<<13)
 148 #define _TNL_BIT_TEX6                (1<<14)
 149 #define _TNL_BIT_TEX7                (1<<15)
 150 #define _TNL_BIT_MAT_FRONT_AMBIENT   (1<<16)
 151 #define _TNL_BIT_MAT_BACK_AMBIENT    (1<<17)
 152 #define _TNL_BIT_MAT_FRONT_DIFFUSE   (1<<18)
 153 #define _TNL_BIT_MAT_BACK_DIFFUSE    (1<<19)
 154 #define _TNL_BIT_MAT_FRONT_SPECULAR  (1<<20)
 155 #define _TNL_BIT_MAT_BACK_SPECULAR   (1<<21)
 156 #define _TNL_BIT_MAT_FRONT_EMISSION  (1<<22)
 157 #define _TNL_BIT_MAT_BACK_EMISSION   (1<<23)
 158 #define _TNL_BIT_MAT_FRONT_SHININESS (1<<24)
 159 #define _TNL_BIT_MAT_BACK_SHININESS  (1<<25)
 160 #define _TNL_BIT_MAT_FRONT_INDEXES   (1<<26)
 161 #define _TNL_BIT_MAT_BACK_INDEXES    (1<<27)
 162 #define _TNL_BIT_INDEX               (1<<28)
 163 #define _TNL_BIT_EDGEFLAG            (1<<29)
 164 #define _TNL_BIT_POINTSIZE           (1<<30)
 165
 166 #define _TNL_BIT_TEX(u)  (1 << (_TNL_ATTRIB_TEX0 + (u)))
 167
 168
 169
 170 #define _TNL_BITS_MAT_ANY  (_TNL_BIT_MAT_FRONT_AMBIENT   |      \
 171                             _TNL_BIT_MAT_BACK_AMBIENT    |      \
 172                             _TNL_BIT_MAT_FRONT_DIFFUSE   |      \
 173                             _TNL_BIT_MAT_BACK_DIFFUSE    |      \
 174                             _TNL_BIT_MAT_FRONT_SPECULAR  |      \
 175                             _TNL_BIT_MAT_BACK_SPECULAR   |      \
 176                             _TNL_BIT_MAT_FRONT_EMISSION  |      \
 177                             _TNL_BIT_MAT_BACK_EMISSION   |      \
 178                             _TNL_BIT_MAT_FRONT_SHININESS |      \
 179                             _TNL_BIT_MAT_BACK_SHININESS  |      \
 180                             _TNL_BIT_MAT_FRONT_INDEXES   |      \
 181                             _TNL_BIT_MAT_BACK_INDEXES)
 182
 183
 184 #define _TNL_BITS_TEX_ANY  (_TNL_BIT_TEX0 |     \
 185                             _TNL_BIT_TEX1 |     \
 186                             _TNL_BIT_TEX2 |     \
 187                             _TNL_BIT_TEX3 |     \
 188                             _TNL_BIT_TEX4 |     \
 189                             _TNL_BIT_TEX5 |     \
 190                             _TNL_BIT_TEX6 |     \
 191                             _TNL_BIT_TEX7)
 192
 193
 194 #define _TNL_BITS_PROG_ANY   (_TNL_BIT_POS    |         \
 195                               _TNL_BIT_WEIGHT |         \
 196                               _TNL_BIT_NORMAL |         \
 197                               _TNL_BIT_COLOR0 |         \
 198                               _TNL_BIT_COLOR1 |         \
 199                               _TNL_BIT_FOG    |         \
 200                               _TNL_BIT_SIX    |         \
 201                               _TNL_BIT_SEVEN  |         \
 202                               _TNL_BITS_TEX_ANY)
 203
 204
 205
 206 #define PRIM_BEGIN     0x10
 207 #define PRIM_END       0x20
 208 #define PRIM_WEAK      0x40
 209 #define PRIM_MODE_MASK 0x0f
 210
 211 /*
 212  */
 213 struct tnl_prim {
 214    GLuint mode;
 215    GLuint start;
 216    GLuint count;
 217 };
 218
 219
 220
 221 struct tnl_eval1_map {
 222    struct gl_1d_map *map;
 223    GLuint sz;
 224 };
 225
 226 struct tnl_eval2_map {
 227    struct gl_2d_map *map;
 228    GLuint sz;
 229 };
 230
 231 struct tnl_eval {
 232    GLuint new_state;
 233    struct tnl_eval1_map map1[_TNL_ATTRIB_INDEX + 1];
 234    struct tnl_eval2_map map2[_TNL_ATTRIB_INDEX + 1];
 235 };
 236
 237
 238 #define TNL_MAX_PRIM 16
 239 #define TNL_MAX_COPIED_VERTS 3
 240
 241 struct tnl_copied_vtx {
 242    GLfloat buffer[_TNL_ATTRIB_MAX * 4 * TNL_MAX_COPIED_VERTS];
 243    GLuint nr;
 244 };
 245
 246 #define VERT_BUFFER_SIZE 2048   /* 8kbytes */
 247
 248
 249 typedef void (*tnl_attrfv_func)( const GLfloat * );
 250
 251 struct _tnl_dynfn {
 252    struct _tnl_dynfn *next, *prev;
 253    GLuint key;
 254    char *code;
 255 };
 256
 257 struct _tnl_dynfn_lists {
 258    struct _tnl_dynfn Vertex[4];
 259    struct _tnl_dynfn Attribute[4];
 260 };
 261
 262 struct _tnl_dynfn_generators {
 263    struct _tnl_dynfn *(*Vertex[4])( GLcontext *ctx, int key );
 264    struct _tnl_dynfn *(*Attribute[4])( GLcontext *ctx, int key );
 265 };
 266
 267 #define _TNL_MAX_ATTR_CODEGEN 16
 268
 269
 270 /* The assembly of vertices in immediate mode is separated from
 271  * display list compilation.  This allows a simpler immediate mode
 272  * treatment and a display list compiler better suited to
 273  * hardware-acceleration.
 274  */
 275 struct tnl_vtx {
 276    GLfloat buffer[VERT_BUFFER_SIZE];
 277    GLubyte attrsz[_TNL_ATTRIB_MAX];
 278    GLuint vertex_size;
 279    struct tnl_prim prim[TNL_MAX_PRIM];
 280    GLuint prim_count;
 281    GLfloat *vbptr;                    /* cursor, points into buffer */
 282    GLfloat vertex[_TNL_ATTRIB_MAX*4]; /* current vertex */
 283    GLfloat *attrptr[_TNL_ATTRIB_MAX]; /* points into vertex */
 284    GLfloat *current[_TNL_ATTRIB_MAX]; /* points into ctx->Current, etc */
 285    GLfloat CurrentFloatEdgeFlag;
 286    GLuint counter, initial_counter;
 287    struct tnl_copied_vtx copied;
 288
 289    tnl_attrfv_func tabfv[_TNL_MAX_ATTR_CODEGEN+1][4]; /* plus 1 for ERROR_ATTRIB */
 290
 291    struct _tnl_dynfn_lists cache;
 292    struct _tnl_dynfn_generators gen;
 293
 294    struct tnl_eval eval;
 295    GLboolean *edgeflag_tmp;
 296    GLboolean have_materials;
 297 };
 298
 299
 300
 301
 302 /* For display lists, this structure holds a run of vertices of the
 303  * same format, and a strictly well-formed set of begin/end pairs,
 304  * starting on the first vertex and ending at the last.  Vertex
 305  * copying on buffer breaks is precomputed according to these
 306  * primitives, though there are situations where the copying will need
 307  * correction at execute-time, perhaps by replaying the list as
 308  * immediate mode commands.
 309  *
 310  * On executing this list, the 'current' values may be updated with
 311  * the values of the final vertex, and often no fixup of the start of
 312  * the vertex list is required.
 313  *
 314  * Eval and other commands that don't fit into these vertex lists are
 315  * compiled using the fallback opcode mechanism provided by dlist.c.
 316  */
 317 struct tnl_vertex_list {
 318    GLubyte attrsz[_TNL_ATTRIB_MAX];
 319    GLuint vertex_size;
 320
 321    GLfloat *buffer;
 322    GLuint count;
 323    GLuint wrap_count;           /* number of copied vertices at start */
 324    GLboolean have_materials;    /* bit of a hack - quick check for materials */
 325    GLboolean dangling_attr_ref; /* current attr implicitly referenced
 326                                    outside the list */
 327
 328    GLfloat *normal_lengths;
 329    struct tnl_prim *prim;
 330    GLuint prim_count;
 331
 332    struct tnl_vertex_store *vertex_store;
 333    struct tnl_primitive_store *prim_store;
 334 };
 335
 336 /* These buffers should be a reasonable size to support upload to
 337  * hardware?  Maybe drivers should stitch them back together, or
 338  * specify a desired size?
 339  */
 340 #define SAVE_BUFFER_SIZE (16*1024)
 341 #define SAVE_PRIM_SIZE   128
 342
 343 /* Storage to be shared among several vertex_lists.
 344  */
 345 struct tnl_vertex_store {
 346    GLfloat buffer[SAVE_BUFFER_SIZE];
 347    GLuint used;
 348    GLuint refcount;
 349 };
 350
 351 struct tnl_primitive_store {
 352    struct tnl_prim buffer[SAVE_PRIM_SIZE];
 353    GLuint used;
 354    GLuint refcount;
 355 };
 356
 357
 358 struct tnl_save {
 359    GLubyte attrsz[_TNL_ATTRIB_MAX];
 360    GLuint vertex_size;
 361
 362    GLfloat *buffer;
 363    GLuint count;
 364    GLuint wrap_count;
 365    GLuint replay_flags;
 366
 367    struct tnl_prim *prim;
 368    GLuint prim_count, prim_max;
 369
 370    struct tnl_vertex_store *vertex_store;
 371    struct tnl_primitive_store *prim_store;
 372
 373    GLfloat *vbptr;                 /* cursor, points into buffer */
 374    GLfloat vertex[_TNL_ATTRIB_MAX*4];      /* current values */
 375    GLfloat *attrptr[_TNL_ATTRIB_MAX];
 376    GLuint counter, initial_counter;
 377    GLboolean dangling_attr_ref;
 378    GLboolean have_materials;
 379
 380    GLuint opcode_vertex_list;
 381
 382    struct tnl_copied_vtx copied;
 383
 384    GLfloat CurrentFloatEdgeFlag;
 385
 386    GLfloat *current[_TNL_ATTRIB_MAX]; /* points into ctx->ListState */
 387    GLubyte *currentsz[_TNL_ATTRIB_MAX];
 388
 389    void (*tabfv[_TNL_ATTRIB_MAX][4])( const GLfloat * );
 390 };
 391
 392
 393 struct tnl_vertex_arrays
 394 {
 395    /* Conventional vertex attribute arrays */
 396    GLvector4f  Obj;
 397    GLvector4f  Normal;
 398    GLvector4f  Color;
 399    GLvector4f  SecondaryColor;
 400    GLvector4f  FogCoord;
 401    GLvector4f  TexCoord[MAX_TEXTURE_COORD_UNITS];
 402    GLvector4f  Index;
 403
 404    GLubyte     *EdgeFlag;
 405    GLuint      *Elt;
 406
 407    /* These attributes don't alias with the conventional attributes.
 408     * The GL_NV_vertex_program extension defines 16 extra sets of vertex
 409     * arrays which have precedent over the conventional arrays when enabled.
 410     */
 411    GLvector4f  Attribs[_TNL_ATTRIB_MAX];
 412 };
 413
 414
 415 /**
 416  * Contains the current state of a running pipeline.
 417  */
 418 struct vertex_buffer
 419 {
 420    /* Constant over life of the vertex_buffer.
 421     */
 422    GLuint      Size;
 423
 424    /* Constant over the pipeline.
 425     */
 426    GLuint      Count;                         /* for everything except Elts */
 427
 428    /* Pointers to current data.
 429     */
 430    GLuint      *Elts;
 431    GLvector4f  *ObjPtr;                         /* _TNL_BIT_POS */
 432    GLvector4f  *EyePtr;                         /* _TNL_BIT_POS */
 433    GLvector4f  *ClipPtr;                        /* _TNL_BIT_POS */
 434    GLvector4f  *NdcPtr;                         /* _TNL_BIT_POS */
 435    GLubyte     ClipOrMask;                      /* _TNL_BIT_POS */
 436    GLubyte     ClipAndMask;                     /* _TNL_BIT_POS */
 437    GLubyte     *ClipMask;                       /* _TNL_BIT_POS */
 438    GLvector4f  *NormalPtr;                      /* _TNL_BIT_NORMAL */
 439    GLfloat     *NormalLengthPtr;                /* _TNL_BIT_NORMAL */
 440    GLboolean   *EdgeFlag;                       /* _TNL_BIT_EDGEFLAG */
 441    GLvector4f  *TexCoordPtr[MAX_TEXTURE_COORD_UNITS]; /* VERT_TEX_0..n */
 442    GLvector4f  *IndexPtr[2];                    /* _TNL_BIT_INDEX */
 443    GLvector4f  *ColorPtr[2];                    /* _TNL_BIT_COLOR0 */
 444    GLvector4f  *SecondaryColorPtr[2];           /* _TNL_BIT_COLOR1 */
 445    GLvector4f  *PointSizePtr;                   /* _TNL_BIT_POS */
 446    GLvector4f  *FogCoordPtr;                    /* _TNL_BIT_FOG */
 447
 448    struct tnl_prim  *Primitive;
 449    GLuint      PrimitiveCount;
 450
 451    /* Inputs to the vertex program stage */
 452    GLvector4f *AttribPtr[_TNL_ATTRIB_MAX];      /* GL_NV_vertex_program */
 453
 454    GLuint LastClipped;
 455    /* Private data from _tnl_render_stage that has no business being
 456     * in this struct.
 457     */
 458 };
 459
 460
 461 /** Describes an individual operation on the pipeline.
 462  */
 463 struct tnl_pipeline_stage
 464 {
 465    const char *name;
 466
 467    /* Private data for the pipeline stage:
 468     */
 469    void *privatePtr;
 470
 471    /* Allocate private data
 472     */
 473    GLboolean (*create)( GLcontext *ctx, struct tnl_pipeline_stage * );
 474
 475    /* Free private data.
 476     */
 477    void (*destroy)( struct tnl_pipeline_stage * );
 478
 479    /* Called on any statechange or input array size change or
 480     * input array change to/from zero stride.
 481     */
 482    void (*validate)( GLcontext *ctx, struct tnl_pipeline_stage * );
 483
 484    /* Called from _tnl_run_pipeline().  The stage.changed_inputs value
 485     * encodes all inputs to thee struct which have changed.  If
 486     * non-zero, recompute all affected outputs of the stage, otherwise
 487     * execute any 'sideeffects' of the stage.
 488     *
 489     * Return value: GL_TRUE - keep going
 490     *               GL_FALSE - finished pipeline
 491     */
 492    GLboolean (*run)( GLcontext *ctx, struct tnl_pipeline_stage * );
 493 };
 494
 495
 496
 497 /** Contains the array of all pipeline stages.
 498  * The default values are defined at the end of t_pipeline.c
 499  */
 500 struct tnl_pipeline {
 501
 502    GLuint last_attrib_stride[_TNL_ATTRIB_MAX];
 503    GLuint last_attrib_size[_TNL_ATTRIB_MAX];
 504    GLuint input_changes;
 505    GLuint new_state;
 506
 507    struct tnl_pipeline_stage stages[MAX_PIPELINE_STAGES+1];
 508    GLuint nr_stages;
 509 };
 510
 511 struct tnl_clipspace;
 512 struct tnl_clipspace_attr;
 513
 514 typedef void (*tnl_extract_func)( const struct tnl_clipspace_attr *a,
 515                                   GLfloat *out,
 516                                   const GLubyte *v );
 517
 518 typedef void (*tnl_insert_func)( const struct tnl_clipspace_attr *a,
 519                                  GLubyte *v,
 520                                  const GLfloat *in );
 521
 522 typedef void (*tnl_emit_func)( GLcontext *ctx,
 523                                GLuint count,
 524                                GLubyte *dest );
 525
 526
 527 /**
 528  * Describes how to convert/move a vertex attribute from a vertex array
 529  * to a vertex structure.
 530  */
 531 struct tnl_clipspace_attr
 532 {
 533    GLuint attrib;          /* which vertex attrib (0=position, etc) */
 534    GLuint format;
 535    GLuint vertoffset;      /* position of the attrib in the vertex struct */
 536    GLuint vertattrsize;    /* size of the attribute in bytes */
 537    GLubyte *inputptr;
 538    GLuint inputstride;
 539    GLuint inputsize;
 540    const tnl_insert_func *insert;
 541    tnl_insert_func emit;
 542    tnl_extract_func extract;
 543    const GLfloat *vp;   /* NDC->Viewport mapping matrix */
 544 };
 545
 546
 547
 548
 549 typedef void (*tnl_points_func)( GLcontext *ctx, GLuint first, GLuint last );
 550 typedef void (*tnl_line_func)( GLcontext *ctx, GLuint v1, GLuint v2 );
 551 typedef void (*tnl_triangle_func)( GLcontext *ctx,
 552                                    GLuint v1, GLuint v2, GLuint v3 );
 553 typedef void (*tnl_quad_func)( GLcontext *ctx, GLuint v1, GLuint v2,
 554                                GLuint v3, GLuint v4 );
 555 typedef void (*tnl_render_func)( GLcontext *ctx, GLuint start, GLuint count,
 556                                  GLuint flags );
 557 typedef void (*tnl_interp_func)( GLcontext *ctx,
 558                                  GLfloat t, GLuint dst, GLuint out, GLuint in,
 559                                  GLboolean force_boundary );
 560 typedef void (*tnl_copy_pv_func)( GLcontext *ctx, GLuint dst, GLuint src );
 561 typedef void (*tnl_setup_func)( GLcontext *ctx,
 562                                 GLuint start, GLuint end,
 563                                 GLuint new_inputs);
 564
 565
 566 struct tnl_clipspace_fastpath {
 567    GLuint vertex_size;
 568    GLuint attr_count;
 569    GLboolean match_strides;
 570
 571    struct {
 572       GLuint format;
 573       GLuint size;
 574       GLuint stride;
 575       GLuint offset;
 576    } *attr;
 577
 578    tnl_emit_func func;
 579    struct tnl_clipspace_fastpath *next;
 580 };
 581
 582 /**
 583  * Used to describe conversion of vertex arrays to vertex structures.
 584  * I.e. Structure of arrays to arrays of structs.
 585  */
 586 struct tnl_clipspace
 587 {
 588    GLboolean need_extras;
 589
 590    GLuint new_inputs;
 591
 592    GLubyte *vertex_buf;
 593    GLuint vertex_size;
 594    GLuint max_vertex_size;
 595
 596    struct tnl_clipspace_attr attr[_TNL_ATTRIB_MAX];
 597    GLuint attr_count;
 598
 599    tnl_emit_func emit;
 600    tnl_interp_func interp;
 601    tnl_copy_pv_func copy_pv;
 602
 603    /* Parameters and constants for codegen:
 604     */
 605    GLboolean need_viewport;
 606    GLfloat vp_scale[4];
 607    GLfloat vp_xlate[4];
 608    GLfloat chan_scale[4];
 609    GLfloat identity[4];
 610
 611    struct tnl_clipspace_fastpath *fastpath;
 612
 613    void (*codegen_emit)( GLcontext *ctx );
 614 };
 615
 616
 617 struct tnl_device_driver
 618 {
 619    /***
 620     *** TNL Pipeline
 621     ***/
 622
 623    void (*RunPipeline)(GLcontext *ctx);
 624    /* Replaces PipelineStart/PipelineFinish -- intended to allow
 625     * drivers to wrap _tnl_run_pipeline() with code to validate state
 626     * and grab/release hardware locks.
 627     */
 628
 629    void (*NotifyMaterialChange)(GLcontext *ctx);
 630    /* Alert tnl-aware drivers of changes to material.
 631     */
 632
 633    GLboolean (*NotifyBegin)(GLcontext *ctx, GLenum p);
 634    /* Allow drivers to hook in optimized begin/end engines.
 635     * Return value:  GL_TRUE - driver handled the begin
 636     *                GL_FALSE - driver didn't handle the begin
 637     */
 638
 639    /***
 640     *** Rendering -- These functions called only from t_vb_render.c
 641     ***/
 642    struct
 643    {
 644       void (*Start)(GLcontext *ctx);
 645       void (*Finish)(GLcontext *ctx);
 646       /* Called before and after all rendering operations, including DrawPixels,
 647        * ReadPixels, Bitmap, span functions, and CopyTexImage, etc commands.
 648        * These are a suitable place for grabbing/releasing hardware locks.
 649        */
 650
 651       void (*PrimitiveNotify)(GLcontext *ctx, GLenum mode);
 652       /* Called between RenderStart() and RenderFinish() to indicate the
 653        * type of primitive we're about to draw.  Mode will be one of the
 654        * modes accepted by glBegin().
 655        */
 656
 657       tnl_interp_func Interp;
 658       /* The interp function is called by the clipping routines when we need
 659        * to generate an interpolated vertex.  All pertinant vertex ancilliary
 660        * data should be computed by interpolating between the 'in' and 'out'
 661        * vertices.
 662        */
 663
 664       tnl_copy_pv_func CopyPV;
 665       /* The copy function is used to make a copy of a vertex.  All pertinant
 666        * vertex attributes should be copied.
 667        */
 668
 669       void (*ClippedPolygon)( GLcontext *ctx, const GLuint *elts, GLuint n );
 670       /* Render a polygon with <n> vertices whose indexes are in the <elts>
 671        * array.
 672        */
 673
 674       void (*ClippedLine)( GLcontext *ctx, GLuint v0, GLuint v1 );
 675       /* Render a line between the two vertices given by indexes v0 and v1. */
 676
 677       tnl_points_func           Points; /* must now respect vb->elts */
 678       tnl_line_func             Line;
 679       tnl_triangle_func         Triangle;
 680       tnl_quad_func             Quad;
 681       /* These functions are called in order to render points, lines,
 682        * triangles and quads.  These are only called via the T&L module.
 683        */
 684
 685       tnl_render_func          *PrimTabVerts;
 686       tnl_render_func          *PrimTabElts;
 687       /* Render whole unclipped primitives (points, lines, linestrips,
 688        * lineloops, etc).  The tables are indexed by the GL enum of the
 689        * primitive to be rendered.  RenderTabVerts is used for non-indexed
 690        * arrays of vertices.  RenderTabElts is used for indexed arrays of
 691        * vertices.
 692        */
 693
 694       void (*ResetLineStipple)( GLcontext *ctx );
 695       /* Reset the hardware's line stipple counter.
 696        */
 697
 698       tnl_setup_func BuildVertices;
 699       /* This function is called whenever new vertices are required for
 700        * rendering.  The vertices in question are those n such that start
 701        * <= n < end.  The new_inputs parameter indicates those fields of
 702        * the vertex which need to be updated, if only a partial repair of
 703        * the vertex is required.
 704        *
 705        * This function is called only from _tnl_render_stage in tnl/t_render.c.
 706        */
 707
 708
 709       GLboolean (*Multipass)( GLcontext *ctx, GLuint passno );
 710       /* Driver may request additional render passes by returning GL_TRUE
 711        * when this function is called.  This function will be called
 712        * after the first pass, and passes will be made until the function
 713        * returns GL_FALSE.  If no function is registered, only one pass
 714        * is made.
 715        *
 716        * This function will be first invoked with passno == 1.
 717        */
 718    } Render;
 719 };
 720
 721
 722 /**
 723  * Context state for T&L context.
 724  */
 725 typedef struct
 726 {
 727    /* Driver interface.
 728     */
 729    struct tnl_device_driver Driver;
 730
 731    /* Execute:
 732     */
 733    struct tnl_vtx vtx;
 734
 735    /* Compile:
 736     */
 737    struct tnl_save save;
 738
 739    /* Pipeline
 740     */
 741    struct tnl_pipeline pipeline;
 742    struct vertex_buffer vb;
 743
 744    /* GLvectors for binding to vb:
 745     */
 746    struct tnl_vertex_arrays vtx_inputs;
 747    struct tnl_vertex_arrays save_inputs;
 748    struct tnl_vertex_arrays current;
 749    struct tnl_vertex_arrays array_inputs;
 750
 751    /* Clipspace/ndc/window vertex managment:
 752     */
 753    struct tnl_clipspace clipspace;
 754
 755    /* Probably need a better configuration mechanism:
 756     */
 757    GLboolean NeedNdcCoords;
 758    GLboolean LoopbackDListCassettes;
 759    GLboolean CalcDListNormalLengths;
 760    GLboolean IsolateMaterials;
 761    GLboolean AllowVertexFog;
 762    GLboolean AllowPixelFog;
 763    GLboolean AllowCodegen;
 764
 765    GLboolean _DoVertexFog;  /* eval fog function at each vertex? */
 766
 767    GLuint render_inputs;
 768
 769    GLvertexformat exec_vtxfmt;
 770    GLvertexformat save_vtxfmt;
 771
 772 } TNLcontext;
 773
 774
 775
 776 #define TNL_CONTEXT(ctx) ((TNLcontext *)((ctx)->swtnl_context))
 777
 778
 779 #define TYPE_IDX(t) ((t) & 0xf)
 780 #define MAX_TYPES TYPE_IDX(GL_DOUBLE)+1      /* 0xa + 1 */
 781
 782 extern void _tnl_MakeCurrent( GLcontext *ctx,
 783                               GLframebuffer *drawBuffer,
 784                               GLframebuffer *readBuffer );
 785
 786
 787
 788
 789 #endif