src/mesa/tnl/t_context.h

   1 /* $Id: t_context.h,v 1.39 2002/04/04 18:25:40 kschultz 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
  97 /* Flags for IM->TexCoordSize.  Enough flags for 16 units.
  98  */
  99 #define TEX_0_SIZE_3          (unsigned)0x1
 100 #define TEX_0_SIZE_4          (unsigned)0x10001
 101 #define TEX_SIZE_3(unit)      (TEX_0_SIZE_3 << (unit))
 102 #define TEX_SIZE_4(unit)      (TEX_0_SIZE_4 << (unit))
 103
 104
 105 /* Shorthands.
 106  */
 107 #define VERT_BITS_OBJ_23   (VERT_BIT_POS | VERT_BIT_OBJ_3)
 108 #define VERT_BITS_OBJ_234  (VERT_BIT_POS | VERT_BIT_OBJ_3 | VERT_BIT_OBJ_4)
 109
 110 #define VERT_BITS_TEX_ANY  (VERT_BIT_TEX0 |     \
 111                             VERT_BIT_TEX1 |     \
 112                             VERT_BIT_TEX2 |     \
 113                             VERT_BIT_TEX3 |     \
 114                             VERT_BIT_TEX4 |     \
 115                             VERT_BIT_TEX5 |     \
 116                             VERT_BIT_TEX6 |     \
 117                             VERT_BIT_TEX7)
 118
 119 #define VERT_BITS_EVAL_ANY (VERT_BIT_EVAL_C1 | VERT_BIT_EVAL_P1 | \
 120                             VERT_BIT_EVAL_C2 | VERT_BIT_EVAL_P2)
 121
 122 #define VERT_BITS_FIXUP    (VERT_BITS_TEX_ANY |         \
 123                             VERT_BIT_COLOR0 |           \
 124                             VERT_BIT_COLOR1 |           \
 125                             VERT_BIT_FOG |              \
 126                             VERT_BIT_INDEX |            \
 127                             VERT_BIT_EDGEFLAG |         \
 128                             VERT_BIT_NORMAL)
 129
 130 #define VERT_BITS_CURRENT_DATA  (VERT_BITS_FIXUP |      \
 131                                  VERT_BIT_MATERIAL)
 132
 133 #define VERT_BITS_DATA     (VERT_BITS_TEX_ANY |         \
 134                             VERT_BIT_COLOR0 |           \
 135                             VERT_BIT_COLOR1 |           \
 136                             VERT_BIT_FOG |              \
 137                             VERT_BIT_INDEX |            \
 138                             VERT_BIT_EDGEFLAG |         \
 139                             VERT_BIT_NORMAL |           \
 140                             VERT_BIT_POS |              \
 141                             VERT_BIT_MATERIAL |         \
 142                             VERT_BIT_ELT |              \
 143                             VERT_BITS_EVAL_ANY)
 144
 145
 146 /**
 147  * KW: Represents everything that can take place between a begin and
 148  * end, and can represent multiple begin/end pairs.  Can be used to
 149  * losslessly encode this information in display lists.
 150  */
 151 struct immediate
 152 {
 153    struct __GLcontextRec *backref;
 154    GLuint id, ref_count;
 155
 156    /* This must be saved when immediates are shared in display lists.
 157     */
 158    GLuint CopyStart, Start, Count;
 159    GLuint LastData;             /* count or count+1 */
 160    GLuint AndFlag, OrFlag;
 161    GLuint TexSize;              /* keep track of texcoord sizes */
 162    GLuint BeginState, SavedBeginState;
 163    GLuint LastPrimitive;
 164
 165    GLuint ArrayEltFlags;        /* precalc'ed for glArrayElt */
 166    GLuint ArrayEltIncr;
 167    GLuint ArrayEltFlush;
 168
 169 #define FLUSH_ELT_EAGER 0x1
 170 #define FLUSH_ELT_LAZY 0x2
 171    GLuint FlushElt;
 172
 173    GLuint MaxTextureUnits;      /* precalc'ed for glMultiTexCoordARB */
 174
 175    /* Temporary values created when vertices are copied into the
 176     * first 3 slots of the struct:
 177     */
 178    GLuint CopyOrFlag;
 179    GLuint CopyAndFlag;
 180    GLuint CopyTexSize;
 181    GLuint Evaluated;
 182
 183
 184    /* allocate storage for these on demand:
 185     */
 186    struct gl_material (*Material)[2];
 187    GLuint *MaterialMask;
 188    GLuint LastMaterial;
 189    GLuint MaterialOrMask;
 190    GLuint MaterialAndMask;
 191
 192    GLuint  Primitive[IMM_SIZE];       /* BEGIN/END */
 193    GLuint  PrimitiveLength[IMM_SIZE]; /* BEGIN/END */
 194    GLuint  Flag[IMM_SIZE];            /* VERT_BIT_* flags */
 195
 196    /* All vertex attributes (position, normal, color, secondary color,
 197     * texcoords, fog coord) are stored in the Attrib[] arrays instead
 198     * of individual arrays as we did prior to Mesa 4.1.
 199     *
 200     * XXX may need to use 32-byte aligned allocation for this!!!
 201     */
 202    GLfloat Attrib[VERT_ATTRIB_MAX][IMM_SIZE][4];  /* GL_NV_vertex_program */
 203
 204    GLfloat *NormalLengthPtr; /* length of normal vectors (display list only) */
 205
 206    GLuint  Elt[IMM_SIZE];
 207    GLubyte EdgeFlag[IMM_SIZE];
 208    GLuint  Index[IMM_SIZE];
 209 };
 210
 211
 212 struct vertex_arrays
 213 {
 214    GLvector4f  Obj;
 215    GLvector4f  Normal;
 216    struct gl_client_array Color;
 217    struct gl_client_array SecondaryColor;
 218    GLvector1ui Index;
 219    GLvector1ub EdgeFlag;
 220    GLvector4f  TexCoord[MAX_TEXTURE_UNITS];
 221    GLvector1ui Elt;
 222    GLvector4f  FogCoord;
 223    GLvector4f  Attribs[VERT_ATTRIB_MAX];
 224 };
 225
 226
 227 /**
 228  * Contains the current state of a running pipeline.
 229  */
 230 typedef struct vertex_buffer
 231 {
 232    /* Constant over life of the vertex_buffer.
 233     */
 234    GLuint Size;
 235
 236    /* Constant over the pipeline.
 237     */
 238    GLuint     Count;                          /* for everything except Elts */
 239    GLuint     FirstClipped;                   /* temp verts for clipping */
 240    GLuint     FirstPrimitive;                 /* usually zero */
 241
 242    /* Pointers to current data.
 243     */
 244    GLuint      *Elts;                           /* VERT_BIT_ELT */
 245    GLvector4f  *ObjPtr;                         /* VERT_BIT_POS */
 246    GLvector4f  *EyePtr;                         /* VERT_BIT_EYE */
 247    GLvector4f  *ClipPtr;                        /* VERT_BIT_CLIP */
 248    GLvector4f  *NdcPtr;                         /* VERT_BIT_CLIP (2) */
 249    GLubyte     ClipOrMask;                      /* VERT_BIT_CLIP (3) */
 250    GLubyte     *ClipMask;                       /* VERT_BIT_CLIP (4) */
 251    GLvector4f  *NormalPtr;                      /* VERT_BIT_NORMAL */
 252    GLfloat     *NormalLengthPtr;                /* VERT_BIT_NORMAL */
 253    GLboolean   *EdgeFlag;                       /* VERT_BIT_EDGEFLAG */
 254    GLvector4f  *TexCoordPtr[MAX_TEXTURE_UNITS]; /* VERT_TEX_0..n */
 255    GLvector1ui *IndexPtr[2];                    /* VERT_BIT_INDEX */
 256    struct gl_client_array *ColorPtr[2];         /* VERT_BIT_COLOR0 */
 257    struct gl_client_array *SecondaryColorPtr[2];/* VERT_BIT_COLOR1 */
 258    GLvector4f  *PointSizePtr;                   /* VERT_BIT_POINT_SIZE */
 259    GLvector4f  *FogCoordPtr;                    /* VERT_BIT_FOG */
 260    struct gl_material (*Material)[2];         /* VERT_BIT_MATERIAL, optional */
 261    GLuint      *MaterialMask;                 /* VERT_BIT_MATERIAL, optional */
 262    GLuint      *Flag;                         /* VERT_BIT_* flags, optional */
 263    GLuint      *Primitive;                    /* GL_(mode)|PRIM_* flags */
 264    GLuint      *PrimitiveLength;              /* integers */
 265
 266    /* Inputs to the vertex program stage */
 267    GLvector4f *AttribPtr[VERT_ATTRIB_MAX];      /* GL_NV_vertex_program */
 268
 269    GLuint importable_data;
 270    void *import_source;
 271    void (*import_data)( GLcontext *ctx, GLuint flags, GLuint vecflags );
 272    /* Callback to the provider of the untransformed input for the
 273     * render stage (or other stages) to call if they need to write into
 274     * write-protected arrays, or fixup the stride on input arrays.
 275     *
 276     * This is currently only necessary for client arrays that make it
 277     * as far down the pipeline as the render stage.
 278     */
 279
 280    GLuint LastClipped;
 281    /* Private data from _tnl_render_stage that has no business being
 282     * in this struct.
 283     */
 284
 285 } TNLvertexbuffer;
 286
 287
 288
 289 /* Describes an individual operation on the pipeline.
 290  */
 291 struct gl_pipeline_stage {
 292    const char *name;
 293    GLuint check_state;          /* All state referenced in check() --
 294                                  * When is the pipeline_stage struct
 295                                  * itself invalidated?  Must be
 296                                  * constant.
 297                                  */
 298
 299    /* Usually constant or set by the 'check' callback:
 300     */
 301    GLuint run_state;            /* All state referenced in run() --
 302                                  * When is the cached output of the
 303                                  * stage invalidated?
 304                                  */
 305
 306    GLboolean active;            /* True if runnable in current state */
 307    GLuint inputs;               /* VERT_* inputs to the stage */
 308    GLuint outputs;              /* VERT_* outputs of the stage */
 309
 310    /* Set in _tnl_run_pipeline():
 311     */
 312    GLuint changed_inputs;       /* Generated value -- inputs to the
 313                                  * stage that have changed since last
 314                                  * call to 'run'.
 315                                  */
 316
 317    /* Private data for the pipeline stage:
 318     */
 319    void *privatePtr;
 320
 321    /* Free private data.  May not be null.
 322     */
 323    void (*destroy)( struct gl_pipeline_stage * );
 324
 325    /* Called from _tnl_validate_pipeline().  Must update all fields in
 326     * the pipeline_stage struct for the current state.
 327     */
 328    void (*check)( GLcontext *ctx, struct gl_pipeline_stage * );
 329
 330    /* Called from _tnl_run_pipeline().  The stage.changed_inputs value
 331     * encodes all inputs to thee struct which have changed.  If
 332     * non-zero, recompute all affected outputs of the stage, otherwise
 333     * execute any 'sideeffects' of the stage.
 334     *
 335     * Return value: GL_TRUE - keep going
 336     *               GL_FALSE - finished pipeline
 337     */
 338    GLboolean (*run)( GLcontext *ctx, struct gl_pipeline_stage * );
 339 };
 340
 341
 342 struct gl_pipeline {
 343    GLuint build_state_trigger;    /* state changes which require build */
 344    GLuint build_state_changes;    /* state changes since last build */
 345    GLuint run_state_changes;      /* state changes since last run */
 346    GLuint run_input_changes;      /* VERT_* changes since last run */
 347    GLuint inputs;                 /* VERT_* inputs to pipeline */
 348    struct gl_pipeline_stage stages[MAX_PIPELINE_STAGES+1];
 349    GLuint nr_stages;
 350 };
 351
 352
 353 struct tnl_eval_store {
 354    GLuint EvalMap1Flags;
 355    GLuint EvalMap2Flags;
 356    GLuint EvalNewState;
 357    struct immediate *im;        /* used for temporary data */
 358 };
 359
 360
 361 typedef void (*points_func)( GLcontext *ctx, GLuint first, GLuint last );
 362 typedef void (*line_func)( GLcontext *ctx, GLuint v1, GLuint v2 );
 363 typedef void (*triangle_func)( GLcontext *ctx,
 364                                GLuint v1, GLuint v2, GLuint v3 );
 365 typedef void (*quad_func)( GLcontext *ctx, GLuint v1, GLuint v2,
 366                            GLuint v3, GLuint v4 );
 367 typedef void (*render_func)( GLcontext *ctx, GLuint start, GLuint count,
 368                              GLuint flags );
 369 typedef void (*interp_func)( GLcontext *ctx,
 370                              GLfloat t, GLuint dst, GLuint out, GLuint in,
 371                              GLboolean force_boundary );
 372 typedef void (*copy_pv_func)( GLcontext *ctx, GLuint dst, GLuint src );
 373 typedef void (*setup_func)( GLcontext *ctx,
 374                             GLuint start, GLuint end,
 375                             GLuint new_inputs);
 376
 377
 378 struct tnl_device_driver {
 379    /***
 380     *** TNL Pipeline
 381     ***/
 382
 383    void (*RunPipeline)(GLcontext *ctx);
 384    /* Replaces PipelineStart/PipelineFinish -- intended to allow
 385     * drivers to wrap _tnl_run_pipeline() with code to validate state
 386     * and grab/release hardware locks.
 387     */
 388
 389    void (*NotifyMaterialChange)(GLcontext *ctx);
 390    /* Alert tnl-aware drivers of changes to material, especially in
 391     * exec_empty_cassette, which doesn't otherwise reach the driver.
 392     * --> Need to be able to disable exec_empty_cassette???
 393     */
 394
 395    /***
 396     *** Rendering -- These functions called only from t_vb_render.c
 397     ***/
 398    struct {
 399       void (*Start)(GLcontext *ctx);
 400       void (*Finish)(GLcontext *ctx);
 401       /* Called before and after all rendering operations, including DrawPixels,
 402        * ReadPixels, Bitmap, span functions, and CopyTexImage, etc commands.
 403        * These are a suitable place for grabbing/releasing hardware locks.
 404        */
 405
 406       void (*PrimitiveNotify)(GLcontext *ctx, GLenum mode);
 407       /* Called between RenderStart() and RenderFinish() to indicate the
 408        * type of primitive we're about to draw.  Mode will be one of the
 409        * modes accepted by glBegin().
 410        */
 411
 412       interp_func Interp;
 413       /* The interp function is called by the clipping routines when we need
 414        * to generate an interpolated vertex.  All pertinant vertex ancilliary
 415        * data should be computed by interpolating between the 'in' and 'out'
 416        * vertices.
 417        */
 418
 419       copy_pv_func CopyPV;
 420       /* The copy function is used to make a copy of a vertex.  All pertinant
 421        * vertex attributes should be copied.
 422        */
 423
 424       void (*ClippedPolygon)( GLcontext *ctx, const GLuint *elts, GLuint n );
 425       /* Render a polygon with <n> vertices whose indexes are in the <elts>
 426        * array.
 427        */
 428
 429       void (*ClippedLine)( GLcontext *ctx, GLuint v0, GLuint v1 );
 430       /* Render a line between the two vertices given by indexes v0 and v1. */
 431
 432       points_func           Points; /* must now respect vb->elts */
 433       line_func             Line;
 434       triangle_func         Triangle;
 435       quad_func             Quad;
 436       /* These functions are called in order to render points, lines,
 437        * triangles and quads.  These are only called via the T&L module.
 438        */
 439
 440       render_func          *PrimTabVerts;
 441       render_func          *PrimTabElts;
 442       /* Render whole unclipped primitives (points, lines, linestrips,
 443        * lineloops, etc).  The tables are indexed by the GL enum of the
 444        * primitive to be rendered.  RenderTabVerts is used for non-indexed
 445        * arrays of vertices.  RenderTabElts is used for indexed arrays of
 446        * vertices.
 447        */
 448
 449       void (*ResetLineStipple)( GLcontext *ctx );
 450       /* Reset the hardware's line stipple counter.
 451        */
 452
 453       setup_func BuildVertices;
 454       /* This function is called whenever new vertices are required for
 455        * rendering.  The vertices in question are those n such that start
 456        * <= n < end.  The new_inputs parameter indicates those fields of
 457        * the vertex which need to be updated, if only a partial repair of
 458        * the vertex is required.
 459        *
 460        * This function is called only from _tnl_render_stage in tnl/t_render.c.
 461        */
 462
 463
 464       GLboolean (*Multipass)( GLcontext *ctx, GLuint passno );
 465       /* Driver may request additional render passes by returning GL_TRUE
 466        * when this function is called.  This function will be called
 467        * after the first pass, and passes will be made until the function
 468        * returns GL_FALSE.  If no function is registered, only one pass
 469        * is made.
 470        *
 471        * This function will be first invoked with passno == 1.
 472        */
 473    } Render;
 474 };
 475
 476
 477 typedef struct {
 478
 479    /* Driver interface.
 480     */
 481    struct tnl_device_driver Driver;
 482
 483    /* Track whether the module is active.
 484     */
 485    GLboolean bound_exec;
 486
 487    /* Display list extensions
 488     */
 489    GLuint opcode_vertex_cassette;
 490
 491    /* Pipeline
 492     */
 493    struct gl_pipeline pipeline;
 494    struct vertex_buffer vb;
 495
 496    /* GLvectors for binding to vb:
 497     */
 498    struct vertex_arrays imm_inputs;
 499    struct vertex_arrays array_inputs;
 500    GLuint *tmp_primitive;
 501    GLuint *tmp_primitive_length;
 502
 503    /* Set when executing an internally generated begin/end object.  If
 504     * such an object is encountered in a display list, it will be
 505     * replayed only if the list is outside any existing begin/end
 506     * objects.
 507     */
 508    GLboolean ReplayHardBeginEnd;
 509
 510    /* Note which vertices need copying over succesive immediates.
 511     * Will add save versions to precompute vertex copying where
 512     * possible.
 513     */
 514    struct immediate *ExecCopySource;
 515    GLuint ExecCopyCount;
 516    GLuint ExecCopyElts[IMM_MAX_COPIED_VERTS];
 517    GLuint ExecCopyTexSize;
 518    GLuint ExecParity;
 519
 520    GLuint DlistPrimitive;
 521    GLuint DlistPrimitiveLength;
 522    GLuint DlistLastPrimitive;
 523
 524    /* Cache a single free immediate (refcount == 0)
 525     */
 526    struct immediate *freed_immediate;
 527
 528    /* Probably need a better configuration mechanism:
 529     */
 530    GLboolean NeedNdcCoords;
 531    GLboolean LoopbackDListCassettes;
 532    GLboolean CalcDListNormalLengths;
 533    GLboolean IsolateMaterials;
 534
 535    /* Derived state and storage for _tnl_eval_vb:
 536     */
 537    struct tnl_eval_store eval;
 538
 539    /* Functions to be plugged into dispatch when tnl is active.
 540     */
 541    GLvertexformat vtxfmt;
 542
 543 } TNLcontext;
 544
 545
 546
 547 #define TNL_CONTEXT(ctx) ((TNLcontext *)(ctx->swtnl_context))
 548 #define TNL_CURRENT_IM(ctx) ((struct immediate *)(ctx->swtnl_im))
 549
 550
 551 #define TYPE_IDX(t) ((t) & 0xf)
 552 #define MAX_TYPES TYPE_IDX(GL_DOUBLE)+1      /* 0xa + 1 */
 553
 554 extern void _tnl_MakeCurrent( GLcontext *ctx,
 555                               GLframebuffer *drawBuffer,
 556                               GLframebuffer *readBuffer );
 557
 558
 559 /*
 560  * Macros for fetching current input buffer.
 561  */
 562 #ifdef THREADS
 563 #define GET_IMMEDIATE  struct immediate *IM = TNL_CURRENT_IM(((GLcontext *) (_glapi_Context ? _glapi_Context : _glapi_get_context())))
 564 #define SET_IMMEDIATE(ctx, im)  ctx->swtnl_im = (void *)im
 565 #else
 566 extern struct immediate *_tnl_CurrentInput;
 567 #define GET_IMMEDIATE struct immediate *IM = _tnl_CurrentInput
 568 #define SET_IMMEDIATE(ctx, im)                  \
 569 do {                                            \
 570    ctx->swtnl_im = (void *)im;                  \
 571    _tnl_CurrentInput = im;                      \
 572 } while (0)
 573 #endif
 574
 575
 576 #endif