src/mesa/tnl/t_context.h

   1 /* $Id: t_context.h,v 1.43 2002/10/09 19:45:53 brianp Exp $ */
   2
   3 /*
   4  * Mesa 3-D graphics library
   5  * Version:  4.1
   6  *
   7  * Copyright (C) 1999-2002  Brian Paul   All Rights Reserved.
   8  *
   9  * Permission is hereby granted, free of charge, to any person obtaining a
  10  * copy of this software and associated documentation files (the "Software"),
  11  * to deal in the Software without restriction, including without limitation
  12  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  13  * and/or sell copies of the Software, and to permit persons to whom the
  14  * Software is furnished to do so, subject to the following conditions:
  15  *
  16  * The above copyright notice and this permission notice shall be included
  17  * in all copies or substantial portions of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  20  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  21  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  22  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  23  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  24  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  */
  26
  27 /**
  28  * \file t_context.h
  29  * \brief TnL module datatypes and definitions.
  30  * \author Keith Whitwell
  31  */
  32
  33 #ifndef _T_CONTEXT_H
  34 #define _T_CONTEXT_H
  35
  36 #include "glheader.h"
  37 #include "mtypes.h"
  38
  39 #include "math/m_matrix.h"
  40 #include "math/m_vector.h"
  41 #include "math/m_xform.h"
  42
  43
  44 #define MAX_PIPELINE_STAGES     30
  45
  46
  47 /* Numbers for sizing immediate structs.
  48  */
  49 #define IMM_MAX_COPIED_VERTS  3
  50 #define IMM_MAXDATA          (216 + IMM_MAX_COPIED_VERTS)
  51 #define IMM_SIZE             (IMM_MAXDATA + MAX_CLIPPED_VERTICES)
  52
  53
  54 /* Values for IM->BeginState
  55  */
  56 #define VERT_BEGIN_0    0x1        /* glBegin (if initially inside beg/end) */
  57 #define VERT_BEGIN_1    0x2        /* glBegin (if initially outside beg/end) */
  58 #define VERT_ERROR_0    0x4        /* invalid_operation in initial state 0 */
  59 #define VERT_ERROR_1    0x8        /* invalid_operation in initial state 1 */
  60
  61
  62 /* Flags to be added to the primitive enum in VB->Primitive.
  63  */
  64 #define PRIM_MODE_MASK  0xff   /* Extract the actual primitive */
  65 #define PRIM_BEGIN      0x100  /* The prim starts here (not wrapped) */
  66 #define PRIM_END        0x200  /* The prim ends in this VB (does not wrap) */
  67 #define PRIM_PARITY     0x400  /* The prim wrapped on an odd number of verts */
  68 #define PRIM_LAST       0x800  /* No more prims in the VB */
  69
  70
  71 /**
  72  * Flags that describe the inputs and outputs of pipeline stages, and
  73  * the contents of a vertex-cassette.  We reuse the VERT_BIT_* flags
  74  * defined in mtypes.h and add a bunch of new ones.
  75  */
  76 /* bits 0..5 defined in mtypes.h */
  77 #define VERT_BIT_INDEX       VERT_BIT_SIX    /* a free vertex attrib bit */
  78 #define VERT_BIT_EDGEFLAG    VERT_BIT_SEVEN  /* a free vertex attrib bit */
  79 /* bits 8..15 defined in mtypes.h */
  80 #define VERT_BIT_EVAL_C1     (1 << 16)  /* imm only */
  81 #define VERT_BIT_EVAL_C2     (1 << 17)  /* imm only */
  82 #define VERT_BIT_EVAL_P1     (1 << 18)  /* imm only */
  83 #define VERT_BIT_EVAL_P2     (1 << 19)  /* imm only */
  84 #define VERT_BIT_OBJ_3       (1 << 20)  /* imm only */
  85 #define VERT_BIT_OBJ_4       (1 << 21)  /* imm only */
  86 #define VERT_BIT_MATERIAL    (1 << 22)  /* imm only, but tested in vb code */
  87 #define VERT_BIT_ELT         (1 << 23)  /* imm only */
  88 #define VERT_BIT_BEGIN       (1 << 24)  /* imm only, but tested in vb code */
  89 #define VERT_BIT_END         (1 << 25)  /* imm only, but tested in vb code */
  90 #define VERT_BIT_END_VB      (1 << 26)  /* imm only, but tested in vb code */
  91 #define VERT_BIT_POINT_SIZE  (1 << 27)  /* vb only, could reuse a bit */
  92 #define VERT_BIT_EYE         VERT_BIT_BEGIN /* vb only, reuse imm bit */
  93 #define VERT_BIT_CLIP        VERT_BIT_END   /* vb only, reuse imm bit*/
  94
  95
  96 /* Flags for IM->TexCoordSize.  Enough flags for 16 units.
  97  */
  98 #define TEX_0_SIZE_3          (unsigned)0x1
  99 #define TEX_0_SIZE_4          (unsigned)0x10001
 100 #define TEX_SIZE_3(unit)      (TEX_0_SIZE_3 << (unit))
 101 #define TEX_SIZE_4(unit)      (TEX_0_SIZE_4 << (unit))
 102
 103
 104 /* Shorthands.
 105  */
 106 #define VERT_BITS_OBJ_23   (VERT_BIT_POS | VERT_BIT_OBJ_3)
 107 #define VERT_BITS_OBJ_234  (VERT_BIT_POS | VERT_BIT_OBJ_3 | VERT_BIT_OBJ_4)
 108
 109 #define VERT_BITS_TEX_ANY  (VERT_BIT_TEX0 |     \
 110                             VERT_BIT_TEX1 |     \
 111                             VERT_BIT_TEX2 |     \
 112                             VERT_BIT_TEX3 |     \
 113                             VERT_BIT_TEX4 |     \
 114                             VERT_BIT_TEX5 |     \
 115                             VERT_BIT_TEX6 |     \
 116                             VERT_BIT_TEX7)
 117
 118 #define VERT_BITS_EVAL_ANY (VERT_BIT_EVAL_C1 | VERT_BIT_EVAL_P1 | \
 119                             VERT_BIT_EVAL_C2 | VERT_BIT_EVAL_P2)
 120
 121 #define VERT_BITS_FIXUP    (VERT_BITS_TEX_ANY |         \
 122                             VERT_BIT_COLOR0 |           \
 123                             VERT_BIT_COLOR1 |           \
 124                             VERT_BIT_FOG |              \
 125                             VERT_BIT_INDEX |            \
 126                             VERT_BIT_EDGEFLAG |         \
 127                             VERT_BIT_NORMAL)
 128
 129 #define VERT_BITS_CURRENT_DATA  (VERT_BITS_FIXUP |      \
 130                                  VERT_BIT_MATERIAL)
 131
 132 #define VERT_BITS_DATA     (VERT_BITS_TEX_ANY |         \
 133                             VERT_BIT_COLOR0 |           \
 134                             VERT_BIT_COLOR1 |           \
 135                             VERT_BIT_FOG |              \
 136                             VERT_BIT_INDEX |            \
 137                             VERT_BIT_EDGEFLAG |         \
 138                             VERT_BIT_NORMAL |           \
 139                             VERT_BIT_POS |              \
 140                             VERT_BIT_MATERIAL |         \
 141                             VERT_BIT_ELT |              \
 142                             VERT_BITS_EVAL_ANY)
 143
 144
 145 /**
 146  * KW: Represents everything that can take place between a begin and
 147  * end, and can represent multiple begin/end pairs.  Can be used to
 148  * losslessly encode this information in display lists.
 149  */
 150 struct immediate
 151 {
 152    GLuint id, ref_count;
 153
 154    /* This must be saved when immediates are shared in display lists.
 155     */
 156    GLuint CopyStart, Start, Count;
 157    GLuint LastData;             /* count or count+1 */
 158    GLuint AndFlag, OrFlag;
 159    GLuint TexSize;              /* keep track of texcoord sizes */
 160    GLuint BeginState, SavedBeginState;
 161    GLuint LastPrimitive;
 162
 163    GLuint ArrayEltFlags;        /* precalc'ed for glArrayElt */
 164    GLuint ArrayEltIncr;
 165    GLuint ArrayEltFlush;
 166
 167 #define FLUSH_ELT_EAGER 0x1
 168 #define FLUSH_ELT_LAZY 0x2
 169    GLuint FlushElt;
 170
 171    GLuint MaxTextureUnits;      /* precalc'ed for glMultiTexCoordARB */
 172
 173    /* Temporary values created when vertices are copied into the
 174     * first 3 slots of the struct:
 175     */
 176    GLuint CopyOrFlag;
 177    GLuint CopyAndFlag;
 178    GLuint CopyTexSize;
 179    GLuint Evaluated;
 180
 181
 182    /* allocate storage for these on demand:
 183     */
 184    struct gl_material (*Material)[2];
 185    GLuint *MaterialMask;
 186    GLuint LastMaterial;
 187    GLuint MaterialOrMask;
 188    GLuint MaterialAndMask;
 189
 190    GLuint  Primitive[IMM_SIZE];       /* BEGIN/END */
 191    GLuint  PrimitiveLength[IMM_SIZE]; /* BEGIN/END */
 192    GLuint  Flag[IMM_SIZE];            /* VERT_BIT_* flags */
 193
 194    /* All vertex attributes (position, normal, color, secondary color,
 195     * texcoords, fog coord) are stored in the Attrib[] arrays instead
 196     * of individual arrays as we did prior to Mesa 4.1.
 197     *
 198     * XXX may need to use 32-byte aligned allocation for this!!!
 199     */
 200    GLfloat Attrib[VERT_ATTRIB_MAX][IMM_SIZE][4];  /* GL_NV_vertex_program */
 201
 202    GLfloat *NormalLengthPtr; /* length of normal vectors (display list only) */
 203
 204    GLuint  Elt[IMM_SIZE];
 205    GLubyte EdgeFlag[IMM_SIZE];
 206    GLuint  Index[IMM_SIZE];
 207 };
 208
 209
 210 struct vertex_arrays
 211 {
 212    /* XXX move a bunch of these fields into the Attribs[] array??? */
 213    GLvector4f  Obj;
 214    GLvector4f  Normal;
 215    struct gl_client_array Color;
 216    struct gl_client_array SecondaryColor;
 217    GLvector1ui Index;
 218    GLvector1ub EdgeFlag;
 219    GLvector4f  TexCoord[MAX_TEXTURE_UNITS];
 220    GLvector1ui Elt;
 221    GLvector4f  FogCoord;
 222    GLvector4f  Attribs[VERT_ATTRIB_MAX];
 223 };
 224
 225
 226 /**
 227  * Contains the current state of a running pipeline.
 228  */
 229 typedef struct vertex_buffer
 230 {
 231    /* Constant over life of the vertex_buffer.
 232     */
 233    GLuint Size;
 234
 235    /* Constant over the pipeline.
 236     */
 237    GLuint     Count;                          /* for everything except Elts */
 238    GLuint     FirstClipped;                   /* temp verts for clipping */
 239    GLuint     FirstPrimitive;                 /* usually zero */
 240
 241    /* Pointers to current data.
 242     */
 243    GLuint      *Elts;                           /* VERT_BIT_ELT */
 244    GLvector4f  *ObjPtr;                         /* VERT_BIT_POS */
 245    GLvector4f  *EyePtr;                         /* VERT_BIT_EYE */
 246    GLvector4f  *ClipPtr;                        /* VERT_BIT_CLIP */
 247    GLvector4f  *NdcPtr;                         /* VERT_BIT_CLIP (2) */
 248    GLubyte     ClipOrMask;                      /* VERT_BIT_CLIP (3) */
 249    GLubyte     *ClipMask;                       /* VERT_BIT_CLIP (4) */
 250    GLvector4f  *NormalPtr;                      /* VERT_BIT_NORMAL */
 251    GLfloat     *NormalLengthPtr;                /* VERT_BIT_NORMAL */
 252    GLboolean   *EdgeFlag;                       /* VERT_BIT_EDGEFLAG */
 253    GLvector4f  *TexCoordPtr[MAX_TEXTURE_UNITS]; /* VERT_TEX_0..n */
 254    GLvector1ui *IndexPtr[2];                    /* VERT_BIT_INDEX */
 255    struct gl_client_array *ColorPtr[2];         /* VERT_BIT_COLOR0 */
 256    struct gl_client_array *SecondaryColorPtr[2];/* VERT_BIT_COLOR1 */
 257    GLvector4f  *PointSizePtr;                   /* VERT_BIT_POINT_SIZE */
 258    GLvector4f  *FogCoordPtr;                    /* VERT_BIT_FOG */
 259    struct gl_material (*Material)[2];         /* VERT_BIT_MATERIAL, optional */
 260    GLuint      *MaterialMask;                 /* VERT_BIT_MATERIAL, optional */
 261    GLuint      *Flag;                         /* VERT_BIT_* flags, optional */
 262    GLuint      *Primitive;                    /* GL_(mode)|PRIM_* flags */
 263    GLuint      *PrimitiveLength;              /* integers */
 264
 265    /* Inputs to the vertex program stage */
 266    GLvector4f *AttribPtr[VERT_ATTRIB_MAX];      /* GL_NV_vertex_program */
 267
 268    GLuint importable_data;
 269    void *import_source;
 270    void (*import_data)( GLcontext *ctx, GLuint flags, GLuint vecflags );
 271    /* Callback to the provider of the untransformed input for the
 272     * render stage (or other stages) to call if they need to write into
 273     * write-protected arrays, or fixup the stride on input arrays.
 274     *
 275     * This is currently only necessary for client arrays that make it
 276     * as far down the pipeline as the render stage.
 277     */
 278
 279    GLuint LastClipped;
 280    /* Private data from _tnl_render_stage that has no business being
 281     * in this struct.
 282     */
 283
 284 } TNLvertexbuffer;
 285
 286
 287
 288 /* Describes an individual operation on the pipeline.
 289  */
 290 struct gl_pipeline_stage {
 291    const char *name;
 292    GLuint check_state;          /* All state referenced in check() --
 293                                  * When is the pipeline_stage struct
 294                                  * itself invalidated?  Must be
 295                                  * constant.
 296                                  */
 297
 298    /* Usually constant or set by the 'check' callback:
 299     */
 300    GLuint run_state;            /* All state referenced in run() --
 301                                  * When is the cached output of the
 302                                  * stage invalidated?
 303                                  */
 304
 305    GLboolean active;            /* True if runnable in current state */
 306    GLuint inputs;               /* VERT_* inputs to the stage */
 307    GLuint outputs;              /* VERT_* outputs of the stage */
 308
 309    /* Set in _tnl_run_pipeline():
 310     */
 311    GLuint changed_inputs;       /* Generated value -- inputs to the
 312                                  * stage that have changed since last
 313                                  * call to 'run'.
 314                                  */
 315
 316    /* Private data for the pipeline stage:
 317     */
 318    void *privatePtr;
 319
 320    /* Free private data.  May not be null.
 321     */
 322    void (*destroy)( struct gl_pipeline_stage * );
 323
 324    /* Called from _tnl_validate_pipeline().  Must update all fields in
 325     * the pipeline_stage struct for the current state.
 326     */
 327    void (*check)( GLcontext *ctx, struct gl_pipeline_stage * );
 328
 329    /* Called from _tnl_run_pipeline().  The stage.changed_inputs value
 330     * encodes all inputs to thee struct which have changed.  If
 331     * non-zero, recompute all affected outputs of the stage, otherwise
 332     * execute any 'sideeffects' of the stage.
 333     *
 334     * Return value: GL_TRUE - keep going
 335     *               GL_FALSE - finished pipeline
 336     */
 337    GLboolean (*run)( GLcontext *ctx, struct gl_pipeline_stage * );
 338 };
 339
 340
 341 struct gl_pipeline {
 342    GLuint build_state_trigger;    /* state changes which require build */
 343    GLuint build_state_changes;    /* state changes since last build */
 344    GLuint run_state_changes;      /* state changes since last run */
 345    GLuint run_input_changes;      /* VERT_* changes since last run */
 346    GLuint inputs;                 /* VERT_* inputs to pipeline */
 347    struct gl_pipeline_stage stages[MAX_PIPELINE_STAGES+1];
 348    GLuint nr_stages;
 349 };
 350
 351
 352 struct tnl_eval_store {
 353    GLuint EvalMap1Flags;
 354    GLuint EvalMap2Flags;
 355    GLuint EvalMap1AttribFlags;  /* GL_NV_vertex_program */
 356    GLuint EvalMap2AttribFlags;  /* GL_NV_vertex_program */
 357    GLuint EvalNewState;
 358    struct immediate *im;        /* used for temporary data */
 359 };
 360
 361
 362 typedef void (*points_func)( GLcontext *ctx, GLuint first, GLuint last );
 363 typedef void (*line_func)( GLcontext *ctx, GLuint v1, GLuint v2 );
 364 typedef void (*triangle_func)( GLcontext *ctx,
 365                                GLuint v1, GLuint v2, GLuint v3 );
 366 typedef void (*quad_func)( GLcontext *ctx, GLuint v1, GLuint v2,
 367                            GLuint v3, GLuint v4 );
 368 typedef void (*render_func)( GLcontext *ctx, GLuint start, GLuint count,
 369                              GLuint flags );
 370 typedef void (*interp_func)( GLcontext *ctx,
 371                              GLfloat t, GLuint dst, GLuint out, GLuint in,
 372                              GLboolean force_boundary );
 373 typedef void (*copy_pv_func)( GLcontext *ctx, GLuint dst, GLuint src );
 374 typedef void (*setup_func)( GLcontext *ctx,
 375                             GLuint start, GLuint end,
 376                             GLuint new_inputs);
 377
 378
 379 struct tnl_device_driver {
 380    /***
 381     *** TNL Pipeline
 382     ***/
 383
 384    void (*RunPipeline)(GLcontext *ctx);
 385    /* Replaces PipelineStart/PipelineFinish -- intended to allow
 386     * drivers to wrap _tnl_run_pipeline() with code to validate state
 387     * and grab/release hardware locks.
 388     */
 389
 390    void (*NotifyMaterialChange)(GLcontext *ctx);
 391    /* Alert tnl-aware drivers of changes to material.
 392     */
 393
 394    GLboolean (*NotifyBegin)(GLcontext *ctx, GLenum p);
 395    /* Allow drivers to hook in optimized begin/end engines.
 396     * Return value:  GL_TRUE - driver handled the begin
 397     *                GL_FALSE - driver didn't handle the begin
 398     */
 399
 400    /***
 401     *** Rendering -- These functions called only from t_vb_render.c
 402     ***/
 403    struct {
 404       void (*Start)(GLcontext *ctx);
 405       void (*Finish)(GLcontext *ctx);
 406       /* Called before and after all rendering operations, including DrawPixels,
 407        * ReadPixels, Bitmap, span functions, and CopyTexImage, etc commands.
 408        * These are a suitable place for grabbing/releasing hardware locks.
 409        */
 410
 411       void (*PrimitiveNotify)(GLcontext *ctx, GLenum mode);
 412       /* Called between RenderStart() and RenderFinish() to indicate the
 413        * type of primitive we're about to draw.  Mode will be one of the
 414        * modes accepted by glBegin().
 415        */
 416
 417       interp_func Interp;
 418       /* The interp function is called by the clipping routines when we need
 419        * to generate an interpolated vertex.  All pertinant vertex ancilliary
 420        * data should be computed by interpolating between the 'in' and 'out'
 421        * vertices.
 422        */
 423
 424       copy_pv_func CopyPV;
 425       /* The copy function is used to make a copy of a vertex.  All pertinant
 426        * vertex attributes should be copied.
 427        */
 428
 429       void (*ClippedPolygon)( GLcontext *ctx, const GLuint *elts, GLuint n );
 430       /* Render a polygon with <n> vertices whose indexes are in the <elts>
 431        * array.
 432        */
 433
 434       void (*ClippedLine)( GLcontext *ctx, GLuint v0, GLuint v1 );
 435       /* Render a line between the two vertices given by indexes v0 and v1. */
 436
 437       points_func           Points; /* must now respect vb->elts */
 438       line_func             Line;
 439       triangle_func         Triangle;
 440       quad_func             Quad;
 441       /* These functions are called in order to render points, lines,
 442        * triangles and quads.  These are only called via the T&L module.
 443        */
 444
 445       render_func          *PrimTabVerts;
 446       render_func          *PrimTabElts;
 447       /* Render whole unclipped primitives (points, lines, linestrips,
 448        * lineloops, etc).  The tables are indexed by the GL enum of the
 449        * primitive to be rendered.  RenderTabVerts is used for non-indexed
 450        * arrays of vertices.  RenderTabElts is used for indexed arrays of
 451        * vertices.
 452        */
 453
 454       void (*ResetLineStipple)( GLcontext *ctx );
 455       /* Reset the hardware's line stipple counter.
 456        */
 457
 458       setup_func BuildVertices;
 459       /* This function is called whenever new vertices are required for
 460        * rendering.  The vertices in question are those n such that start
 461        * <= n < end.  The new_inputs parameter indicates those fields of
 462        * the vertex which need to be updated, if only a partial repair of
 463        * the vertex is required.
 464        *
 465        * This function is called only from _tnl_render_stage in tnl/t_render.c.
 466        */
 467
 468
 469       GLboolean (*Multipass)( GLcontext *ctx, GLuint passno );
 470       /* Driver may request additional render passes by returning GL_TRUE
 471        * when this function is called.  This function will be called
 472        * after the first pass, and passes will be made until the function
 473        * returns GL_FALSE.  If no function is registered, only one pass
 474        * is made.
 475        *
 476        * This function will be first invoked with passno == 1.
 477        */
 478    } Render;
 479 };
 480
 481
 482 typedef struct {
 483
 484    /* Driver interface.
 485     */
 486    struct tnl_device_driver Driver;
 487
 488    /* Track whether the module is active.
 489     */
 490    GLboolean bound_exec;
 491
 492    /* Display list extensions
 493     */
 494    GLuint opcode_vertex_cassette;
 495
 496    /* Pipeline
 497     */
 498    struct gl_pipeline pipeline;
 499    struct vertex_buffer vb;
 500
 501    /* GLvectors for binding to vb:
 502     */
 503    struct vertex_arrays imm_inputs;
 504    struct vertex_arrays array_inputs;
 505    GLuint *tmp_primitive;
 506    GLuint *tmp_primitive_length;
 507
 508    /* Set when executing an internally generated begin/end object.  If
 509     * such an object is encountered in a display list, it will be
 510     * replayed only if the list is outside any existing begin/end
 511     * objects.
 512     */
 513    GLboolean ReplayHardBeginEnd;
 514
 515    /* Note which vertices need copying over succesive immediates.
 516     * Will add save versions to precompute vertex copying where
 517     * possible.
 518     */
 519    struct immediate *ExecCopySource;
 520    GLuint ExecCopyCount;
 521    GLuint ExecCopyElts[IMM_MAX_COPIED_VERTS];
 522    GLuint ExecCopyTexSize;
 523    GLuint ExecParity;
 524
 525    GLuint DlistPrimitive;
 526    GLuint DlistPrimitiveLength;
 527    GLuint DlistLastPrimitive;
 528
 529    /* Cache a single free immediate (refcount == 0)
 530     */
 531    struct immediate *freed_immediate;
 532
 533    /* Probably need a better configuration mechanism:
 534     */
 535    GLboolean NeedNdcCoords;
 536    GLboolean LoopbackDListCassettes;
 537    GLboolean CalcDListNormalLengths;
 538    GLboolean IsolateMaterials;
 539
 540    /* Derived state and storage for _tnl_eval_vb:
 541     */
 542    struct tnl_eval_store eval;
 543
 544    /* Functions to be plugged into dispatch when tnl is active.
 545     */
 546    GLvertexformat vtxfmt;
 547    GLvertexformat save_vtxfmt;
 548
 549 } TNLcontext;
 550
 551
 552
 553 #define TNL_CONTEXT(ctx) ((TNLcontext *)(ctx->swtnl_context))
 554 #define TNL_CURRENT_IM(ctx) ((struct immediate *)(ctx->swtnl_im))
 555
 556
 557 #define TYPE_IDX(t) ((t) & 0xf)
 558 #define MAX_TYPES TYPE_IDX(GL_DOUBLE)+1      /* 0xa + 1 */
 559
 560 extern void _tnl_MakeCurrent( GLcontext *ctx,
 561                               GLframebuffer *drawBuffer,
 562                               GLframebuffer *readBuffer );
 563
 564
 565 /*
 566  * Macros for fetching current input buffer.
 567  */
 568 #ifdef THREADS
 569 #define GET_IMMEDIATE  struct immediate *IM = TNL_CURRENT_IM(((GLcontext *) (_glapi_Context ? _glapi_Context : _glapi_get_context())))
 570 #define SET_IMMEDIATE(ctx, im)  ctx->swtnl_im = (void *)im
 571 #else
 572 extern struct immediate *_tnl_CurrentInput;
 573 #define GET_IMMEDIATE struct immediate *IM = _tnl_CurrentInput
 574 #define SET_IMMEDIATE(ctx, im)                  \
 575 do {                                            \
 576    ctx->swtnl_im = (void *)im;                  \
 577    _tnl_CurrentInput = im;                      \
 578 } while (0)
 579 #endif
 580
 581
 582 #endif