src/mesa/tnl/t_context.h

   1 /*
   2  * mesa 3-D graphics library
   3  *
   4  * Copyright (C) 1999-2006  Brian Paul   All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the "Software"),
   8  * to deal in the Software without restriction, including without limitation
   9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  10  * and/or sell copies of the Software, and to permit persons to whom the
  11  * Software is furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included
  14  * in all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  17  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  20  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  21  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  22  * 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  */
  47
  48
  49 #ifndef _T_CONTEXT_H
  50 #define _T_CONTEXT_H
  51
  52 #include "main/glheader.h"
  53 #include "main/imports.h"
  54 #include "main/mtypes.h"
  55
  56 #include "math/m_vector.h"
  57
  58 #include "vbo/vbo.h"
  59
  60 #define MAX_PIPELINE_STAGES     30
  61
  62 /*
  63  * Note: The first attributes match the VERT_ATTRIB_* definitions
  64  * in mtypes.h.  However, the tnl module has additional attributes
  65  * for materials, color indexes, edge flags, etc.
  66  */
  67 /* Although it's nice to use these as bit indexes in a DWORD flag, we
  68  * could manage without if necessary.  Another limit currently is the
  69  * number of bits allocated for these numbers in places like vertex
  70  * program instruction formats and register layouts.
  71  */
  72 /* The bit space exhaustion is a fact now, done by _TNL_ATTRIB_ATTRIBUTE* for
  73  * GLSL vertex shader which cannot be aliased with conventional vertex attribs.
  74  * Compacting _TNL_ATTRIB_MAT_* attribs would not work, they would not give
  75  * as many free bits (11 plus already 1 free bit) as _TNL_ATTRIB_ATTRIBUTE*
  76  * attribs want (16).
  77  */
  78 enum {
  79         _TNL_ATTRIB_POS,
  80         _TNL_ATTRIB_NORMAL,
  81         _TNL_ATTRIB_COLOR0,
  82         _TNL_ATTRIB_COLOR1,
  83         _TNL_ATTRIB_FOG,
  84         _TNL_ATTRIB_COLOR_INDEX,
  85         _TNL_ATTRIB_EDGEFLAG,
  86         _TNL_ATTRIB_TEX0,
  87         _TNL_ATTRIB_TEX1,
  88         _TNL_ATTRIB_TEX2,
  89         _TNL_ATTRIB_TEX3,
  90         _TNL_ATTRIB_TEX4,
  91         _TNL_ATTRIB_TEX5,
  92         _TNL_ATTRIB_TEX6,
  93         _TNL_ATTRIB_TEX7,
  94
  95         /* This is really a VARYING_SLOT, not an attrib.  Need to fix
  96          * tnl to understand the difference.
  97          */
  98         _TNL_ATTRIB_POINTSIZE,
  99
 100         _TNL_ATTRIB_GENERIC0, /* doesn't really exist! */
 101         _TNL_ATTRIB_GENERIC1,
 102         _TNL_ATTRIB_GENERIC2,
 103         _TNL_ATTRIB_GENERIC3,
 104         _TNL_ATTRIB_GENERIC4,
 105         _TNL_ATTRIB_GENERIC5,
 106         _TNL_ATTRIB_GENERIC6,
 107         _TNL_ATTRIB_GENERIC7,
 108         _TNL_ATTRIB_GENERIC8,
 109         _TNL_ATTRIB_GENERIC9,
 110         _TNL_ATTRIB_GENERIC10,
 111         _TNL_ATTRIB_GENERIC11,
 112         _TNL_ATTRIB_GENERIC12,
 113         _TNL_ATTRIB_GENERIC13,
 114         _TNL_ATTRIB_GENERIC14,
 115         _TNL_ATTRIB_GENERIC15,
 116
 117         _TNL_ATTRIB_MAX,
 118
 119         /* These alias with the generics, but they are not active
 120          * concurrently, so it's not a problem.  The TNL module
 121          * doesn't have to do anything about this as this is how they
 122          * are passed into the _draw_prims callback.
 123          *
 124          * When we generate fixed-function replacement programs (in
 125          * t_vp_build.c currently), they refer to the appropriate
 126          * generic attribute in order to pick up per-vertex material
 127          * data.
 128          */
 129         _TNL_ATTRIB_MAT_FRONT_AMBIENT=VERT_ATTRIB_MAT(MAT_ATTRIB_FRONT_AMBIENT),
 130         _TNL_ATTRIB_MAT_BACK_AMBIENT,
 131         _TNL_ATTRIB_MAT_FRONT_DIFFUSE,
 132         _TNL_ATTRIB_MAT_BACK_DIFFUSE,
 133         _TNL_ATTRIB_MAT_FRONT_SPECULAR,
 134         _TNL_ATTRIB_MAT_BACK_SPECULAR,
 135         _TNL_ATTRIB_MAT_FRONT_EMISSION,
 136         _TNL_ATTRIB_MAT_BACK_EMISSION,
 137         _TNL_ATTRIB_MAT_FRONT_SHININESS,
 138         _TNL_ATTRIB_MAT_BACK_SHININESS,
 139         _TNL_ATTRIB_MAT_FRONT_INDEXES,
 140         _TNL_ATTRIB_MAT_BACK_INDEXES,
 141 };
 142
 143 #define _TNL_ATTRIB_TEX(u)       (_TNL_ATTRIB_TEX0 + (u))
 144 #define _TNL_ATTRIB_GENERIC(n) (_TNL_ATTRIB_GENERIC0 + (n))
 145
 146 /* special index used for handing invalid glVertexAttribute() indices */
 147 #define _TNL_ATTRIB_ERROR    (_TNL_ATTRIB_GENERIC15 + 1)
 148
 149 /**
 150  * Handy attribute ranges:
 151  */
 152 #define _TNL_FIRST_PROG      _TNL_ATTRIB_NORMAL
 153 #define _TNL_LAST_PROG       _TNL_ATTRIB_TEX7
 154
 155 #define _TNL_FIRST_TEX       _TNL_ATTRIB_TEX0
 156 #define _TNL_LAST_TEX        _TNL_ATTRIB_TEX7
 157
 158 #define _TNL_FIRST_GENERIC _TNL_ATTRIB_GENERIC0
 159 #define _TNL_LAST_GENERIC  _TNL_ATTRIB_GENERIC15
 160
 161 #define _TNL_FIRST_MAT       _TNL_ATTRIB_MAT_FRONT_AMBIENT /* GENERIC4 */
 162 #define _TNL_LAST_MAT        _TNL_ATTRIB_MAT_BACK_INDEXES  /* GENERIC15 */
 163
 164 /* Number of available texture attributes */
 165 #define _TNL_NUM_TEX 8
 166
 167 /* Number of available generic attributes */
 168 #define _TNL_NUM_GENERIC 16
 169
 170 /* Number of attributes used for evaluators */
 171 #define _TNL_NUM_EVAL 16
 172
 173
 174 #define PRIM_BEGIN     0x10
 175 #define PRIM_END       0x20
 176 #define PRIM_MODE_MASK 0x0f
 177
 178 static inline GLuint _tnl_translate_prim( const struct _mesa_prim *prim )
 179 {
 180    GLuint flag;
 181    flag = prim->mode;
 182    if (prim->begin) flag |= PRIM_BEGIN;
 183    if (prim->end) flag |= PRIM_END;
 184    return flag;
 185 }
 186
 187
 188
 189
 190 /**
 191  * Contains the current state of a running pipeline.
 192  */
 193 struct vertex_buffer
 194 {
 195    GLuint Size;  /**< Max vertices per vertex buffer, constant */
 196
 197    /* Constant over the pipeline.
 198     */
 199    GLuint Count;  /**< Number of vertices currently in buffer */
 200
 201    /* Pointers to current data.  Most of the data is in AttribPtr -- all of
 202     * it that is one of VERT_ATTRIB_X.  For things only produced by TNL,
 203     * such as backface color or eye-space coordinates, they are stored
 204     * here.
 205     */
 206    GLuint      *Elts;
 207    GLvector4f  *EyePtr;                         /* _TNL_BIT_POS */
 208    GLvector4f  *ClipPtr;                        /* _TNL_BIT_POS */
 209    GLvector4f  *NdcPtr;                         /* _TNL_BIT_POS */
 210    GLubyte     ClipOrMask;                      /* _TNL_BIT_POS */
 211    GLubyte     ClipAndMask;                     /* _TNL_BIT_POS */
 212    GLubyte     *ClipMask;                       /* _TNL_BIT_POS */
 213    GLfloat     *NormalLengthPtr;                /* _TNL_BIT_NORMAL */
 214    GLboolean   *EdgeFlag;                       /* _TNL_BIT_EDGEFLAG */
 215    GLvector4f  *BackfaceIndexPtr;
 216    GLvector4f  *BackfaceColorPtr;
 217    GLvector4f  *BackfaceSecondaryColorPtr;
 218
 219    const struct _mesa_prim  *Primitive;
 220    GLuint      PrimitiveCount;
 221
 222    /* Inputs to the vertex program stage */
 223    GLvector4f *AttribPtr[_TNL_ATTRIB_MAX];
 224 };
 225
 226
 227 /**
 228  * Describes an individual operation on the pipeline.
 229  */
 230 struct tnl_pipeline_stage
 231 {
 232    const char *name;
 233
 234    /* Private data for the pipeline stage:
 235     */
 236    void *privatePtr;
 237
 238    /* Allocate private data
 239     */
 240    GLboolean (*create)( struct gl_context *ctx, struct tnl_pipeline_stage * );
 241
 242    /* Free private data.
 243     */
 244    void (*destroy)( struct tnl_pipeline_stage * );
 245
 246    /* Called on any statechange or input array size change or
 247     * input array change to/from zero stride.
 248     */
 249    void (*validate)( struct gl_context *ctx, struct tnl_pipeline_stage * );
 250
 251    /* Called from _tnl_run_pipeline().  The stage.changed_inputs value
 252     * encodes all inputs to thee struct which have changed.  If
 253     * non-zero, recompute all affected outputs of the stage, otherwise
 254     * execute any 'sideeffects' of the stage.
 255     *
 256     * Return value: GL_TRUE - keep going
 257     *               GL_FALSE - finished pipeline
 258     */
 259    GLboolean (*run)( struct gl_context *ctx, struct tnl_pipeline_stage * );
 260 };
 261
 262
 263
 264 /** Contains the array of all pipeline stages.
 265  * The default values are defined at the end of t_pipeline.c
 266  */
 267 struct tnl_pipeline {
 268
 269    GLuint last_attrib_stride[_TNL_ATTRIB_MAX];
 270    GLuint last_attrib_size[_TNL_ATTRIB_MAX];
 271    GLuint input_changes;
 272    GLuint new_state;
 273
 274    struct tnl_pipeline_stage stages[MAX_PIPELINE_STAGES+1];
 275    GLuint nr_stages;
 276 };
 277
 278 struct tnl_clipspace;
 279 struct tnl_clipspace_attr;
 280
 281 typedef void (*tnl_extract_func)( const struct tnl_clipspace_attr *a,
 282                                   GLfloat *out,
 283                                   const GLubyte *v );
 284
 285 typedef void (*tnl_insert_func)( const struct tnl_clipspace_attr *a,
 286                                  GLubyte *v,
 287                                  const GLfloat *in );
 288
 289 typedef void (*tnl_emit_func)( struct gl_context *ctx,
 290                                GLuint count,
 291                                GLubyte *dest );
 292
 293
 294 /**
 295  * Describes how to convert/move a vertex attribute from a vertex array
 296  * to a vertex structure.
 297  */
 298 struct tnl_clipspace_attr
 299 {
 300    GLuint attrib;          /* which vertex attrib (0=position, etc) */
 301    GLuint format;
 302    GLuint vertoffset;      /* position of the attrib in the vertex struct */
 303    GLuint vertattrsize;    /* size of the attribute in bytes */
 304    GLubyte *inputptr;
 305    GLuint inputstride;
 306    GLuint inputsize;
 307    const tnl_insert_func *insert;
 308    tnl_insert_func emit;
 309    tnl_extract_func extract;
 310    const GLfloat *vp;   /* NDC->Viewport mapping matrix */
 311 };
 312
 313
 314
 315
 316 typedef void (*tnl_points_func)( struct gl_context *ctx, GLuint first, GLuint last );
 317 typedef void (*tnl_line_func)( struct gl_context *ctx, GLuint v1, GLuint v2 );
 318 typedef void (*tnl_triangle_func)( struct gl_context *ctx,
 319                                    GLuint v1, GLuint v2, GLuint v3 );
 320 typedef void (*tnl_quad_func)( struct gl_context *ctx, GLuint v1, GLuint v2,
 321                                GLuint v3, GLuint v4 );
 322 typedef void (*tnl_render_func)( struct gl_context *ctx, GLuint start, GLuint count,
 323                                  GLuint flags );
 324 typedef void (*tnl_interp_func)( struct gl_context *ctx,
 325                                  GLfloat t, GLuint dst, GLuint out, GLuint in,
 326                                  GLboolean force_boundary );
 327 typedef void (*tnl_copy_pv_func)( struct gl_context *ctx, GLuint dst, GLuint src );
 328 typedef void (*tnl_setup_func)( struct gl_context *ctx,
 329                                 GLuint start, GLuint end,
 330                                 GLuint new_inputs);
 331
 332
 333 struct tnl_attr_type {
 334    GLuint format;
 335    GLuint size;
 336    GLuint stride;
 337    GLuint offset;
 338 };
 339
 340 struct tnl_clipspace_fastpath {
 341    GLuint vertex_size;
 342    GLuint attr_count;
 343    GLboolean match_strides;
 344
 345    struct tnl_attr_type *attr;
 346
 347    tnl_emit_func func;
 348    struct tnl_clipspace_fastpath *next;
 349 };
 350
 351 /**
 352  * Used to describe conversion of vertex arrays to vertex structures.
 353  * I.e. Structure of arrays to arrays of structs.
 354  */
 355 struct tnl_clipspace
 356 {
 357    GLboolean need_extras;
 358
 359    GLuint new_inputs;
 360
 361    GLubyte *vertex_buf;
 362    GLuint vertex_size;
 363    GLuint max_vertex_size;
 364
 365    struct tnl_clipspace_attr attr[_TNL_ATTRIB_MAX];
 366    GLuint attr_count;
 367
 368    tnl_emit_func emit;
 369    tnl_interp_func interp;
 370    tnl_copy_pv_func copy_pv;
 371
 372    /* Parameters and constants for codegen:
 373     */
 374    GLboolean need_viewport;
 375    GLfloat vp_scale[4];
 376    GLfloat vp_xlate[4];
 377    GLfloat chan_scale[4];
 378    GLfloat identity[4];
 379
 380    struct tnl_clipspace_fastpath *fastpath;
 381
 382    void (*codegen_emit)( struct gl_context *ctx );
 383 };
 384
 385
 386 #define SHINE_TABLE_SIZE 256    /**< Material shininess lookup table sizes */
 387
 388 /**
 389  * Material shininess lookup table.
 390  */
 391 struct tnl_shine_tab
 392 {
 393    struct tnl_shine_tab *next, *prev;
 394    GLfloat tab[SHINE_TABLE_SIZE+1];
 395    GLfloat shininess;
 396    GLuint refcount;
 397 };
 398
 399
 400 struct tnl_device_driver
 401 {
 402    /***
 403     *** TNL Pipeline
 404     ***/
 405
 406    void (*RunPipeline)(struct gl_context *ctx);
 407    /* Replaces PipelineStart/PipelineFinish -- intended to allow
 408     * drivers to wrap _tnl_run_pipeline() with code to validate state
 409     * and grab/release hardware locks.
 410     */
 411
 412    void (*NotifyMaterialChange)(struct gl_context *ctx);
 413    /* Alert tnl-aware drivers of changes to material.
 414     */
 415
 416    /***
 417     *** Rendering -- These functions called only from t_vb_render.c
 418     ***/
 419    struct
 420    {
 421       void (*Start)(struct gl_context *ctx);
 422       void (*Finish)(struct gl_context *ctx);
 423       /* Called before and after all rendering operations, including DrawPixels,
 424        * ReadPixels, Bitmap, span functions, and CopyTexImage, etc commands.
 425        * These are a suitable place for grabbing/releasing hardware locks.
 426        */
 427
 428       void (*PrimitiveNotify)(struct gl_context *ctx, GLenum mode);
 429       /* Called between RenderStart() and RenderFinish() to indicate the
 430        * type of primitive we're about to draw.  Mode will be one of the
 431        * modes accepted by glBegin().
 432        */
 433
 434       tnl_interp_func Interp;
 435       /* The interp function is called by the clipping routines when we need
 436        * to generate an interpolated vertex.  All pertinant vertex ancilliary
 437        * data should be computed by interpolating between the 'in' and 'out'
 438        * vertices.
 439        */
 440
 441       tnl_copy_pv_func CopyPV;
 442       /* The copy function is used to make a copy of a vertex.  All pertinant
 443        * vertex attributes should be copied.
 444        */
 445
 446       void (*ClippedPolygon)( struct gl_context *ctx, const GLuint *elts, GLuint n );
 447       /* Render a polygon with <n> vertices whose indexes are in the <elts>
 448        * array.
 449        */
 450
 451       void (*ClippedLine)( struct gl_context *ctx, GLuint v0, GLuint v1 );
 452       /* Render a line between the two vertices given by indexes v0 and v1. */
 453
 454       tnl_points_func           Points; /* must now respect vb->elts */
 455       tnl_line_func             Line;
 456       tnl_triangle_func         Triangle;
 457       tnl_quad_func             Quad;
 458       /* These functions are called in order to render points, lines,
 459        * triangles and quads.  These are only called via the T&L module.
 460        */
 461
 462       tnl_render_func          *PrimTabVerts;
 463       tnl_render_func          *PrimTabElts;
 464       /* Render whole unclipped primitives (points, lines, linestrips,
 465        * lineloops, etc).  The tables are indexed by the GL enum of the
 466        * primitive to be rendered.  RenderTabVerts is used for non-indexed
 467        * arrays of vertices.  RenderTabElts is used for indexed arrays of
 468        * vertices.
 469        */
 470
 471       void (*ResetLineStipple)( struct gl_context *ctx );
 472       /* Reset the hardware's line stipple counter.
 473        */
 474
 475       tnl_setup_func BuildVertices;
 476       /* This function is called whenever new vertices are required for
 477        * rendering.  The vertices in question are those n such that start
 478        * <= n < end.  The new_inputs parameter indicates those fields of
 479        * the vertex which need to be updated, if only a partial repair of
 480        * the vertex is required.
 481        *
 482        * This function is called only from _tnl_render_stage in tnl/t_render.c.
 483        */
 484
 485
 486       GLboolean (*Multipass)( struct gl_context *ctx, GLuint passno );
 487       /* Driver may request additional render passes by returning GL_TRUE
 488        * when this function is called.  This function will be called
 489        * after the first pass, and passes will be made until the function
 490        * returns GL_FALSE.  If no function is registered, only one pass
 491        * is made.
 492        *
 493        * This function will be first invoked with passno == 1.
 494        */
 495    } Render;
 496 };
 497
 498
 499 /**
 500  * Context state for T&L context.
 501  */
 502 typedef struct
 503 {
 504    /* Driver interface.
 505     */
 506    struct tnl_device_driver Driver;
 507
 508    /* Pipeline
 509     */
 510    struct tnl_pipeline pipeline;
 511    struct vertex_buffer vb;
 512
 513    /* Clipspace/ndc/window vertex managment:
 514     */
 515    struct tnl_clipspace clipspace;
 516    GLmatrix _WindowMap;
 517
 518    /* Probably need a better configuration mechanism:
 519     */
 520    GLboolean NeedNdcCoords;
 521    GLboolean AllowVertexFog;
 522    GLboolean AllowPixelFog;
 523    GLboolean _DoVertexFog;  /* eval fog function at each vertex? */
 524
 525    GLbitfield64 render_inputs_bitset;
 526
 527    GLvector4f tmp_inputs[VERT_ATTRIB_MAX];
 528
 529    /* Temp storage for t_draw.c:
 530     */
 531    GLubyte *block[VERT_ATTRIB_MAX];
 532    GLuint nr_blocks;
 533
 534    GLuint CurInstance;
 535
 536    struct tnl_shine_tab *_ShineTable[2]; /**< Active shine tables */
 537    struct tnl_shine_tab *_ShineTabList;  /**< MRU list of inactive shine tables */
 538    /**@}*/
 539
 540    /* The list of gl_vertex_array inputs. */
 541    struct vbo_inputs draw_arrays;
 542 } TNLcontext;
 543
 544
 545
 546 #define TNL_CONTEXT(ctx) ((TNLcontext *)((ctx)->swtnl_context))
 547
 548
 549 #define TYPE_IDX(t) ((t) & 0xf)
 550 #define MAX_TYPES TYPE_IDX(GL_DOUBLE)+1      /* 0xa + 1 */
 551
 552
 553 extern void
 554 tnl_clip_prepare(struct gl_context *ctx);
 555
 556
 557 #endif