src/mesa/tnl/t_context.h

   1 /*
   2  * mesa 3-D graphics library
   3  * Version:  6.5
   4  *
   5  * Copyright (C) 1999-2006  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  */
  47
  48
  49 #ifndef _T_CONTEXT_H
  50 #define _T_CONTEXT_H
  51
  52 #include "main/glheader.h"
  53 #include "main/bitset.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 = 0,
  80         _TNL_ATTRIB_WEIGHT = 1,
  81         _TNL_ATTRIB_NORMAL = 2,
  82         _TNL_ATTRIB_COLOR0 = 3,
  83         _TNL_ATTRIB_COLOR1 = 4,
  84         _TNL_ATTRIB_FOG = 5,
  85         _TNL_ATTRIB_COLOR_INDEX = 6,
  86         _TNL_ATTRIB_EDGEFLAG = 7,
  87         _TNL_ATTRIB_TEX0 = 8,
  88         _TNL_ATTRIB_TEX1 = 9,
  89         _TNL_ATTRIB_TEX2 = 10,
  90         _TNL_ATTRIB_TEX3 = 11,
  91         _TNL_ATTRIB_TEX4 = 12,
  92         _TNL_ATTRIB_TEX5 = 13,
  93         _TNL_ATTRIB_TEX6 = 14,
  94         _TNL_ATTRIB_TEX7 = 15,
  95
  96         _TNL_ATTRIB_GENERIC0 = 16, /* doesn't really exist! */
  97         _TNL_ATTRIB_GENERIC1 = 17,
  98         _TNL_ATTRIB_GENERIC2 = 18,
  99         _TNL_ATTRIB_GENERIC3 = 19,
 100         _TNL_ATTRIB_GENERIC4 = 20,
 101         _TNL_ATTRIB_GENERIC5 = 21,
 102         _TNL_ATTRIB_GENERIC6 = 22,
 103         _TNL_ATTRIB_GENERIC7 = 23,
 104         _TNL_ATTRIB_GENERIC8 = 24,
 105         _TNL_ATTRIB_GENERIC9 = 25,
 106         _TNL_ATTRIB_GENERIC10 = 26,
 107         _TNL_ATTRIB_GENERIC11 = 27,
 108         _TNL_ATTRIB_GENERIC12 = 28,
 109         _TNL_ATTRIB_GENERIC13 = 29,
 110         _TNL_ATTRIB_GENERIC14 = 30,
 111         _TNL_ATTRIB_GENERIC15 = 31,
 112
 113         /* These alias with the generics, but they are not active
 114          * concurrently, so it's not a problem.  The TNL module
 115          * doesn't have to do anything about this as this is how they
 116          * are passed into the _draw_prims callback.
 117          *
 118          * When we generate fixed-function replacement programs (in
 119          * t_vp_build.c currently), they refer to the appropriate
 120          * generic attribute in order to pick up per-vertex material
 121          * data.
 122          */
 123         _TNL_ATTRIB_MAT_FRONT_AMBIENT = 16,
 124         _TNL_ATTRIB_MAT_BACK_AMBIENT = 17,
 125         _TNL_ATTRIB_MAT_FRONT_DIFFUSE = 18,
 126         _TNL_ATTRIB_MAT_BACK_DIFFUSE = 19,
 127         _TNL_ATTRIB_MAT_FRONT_SPECULAR = 20,
 128         _TNL_ATTRIB_MAT_BACK_SPECULAR = 21,
 129         _TNL_ATTRIB_MAT_FRONT_EMISSION = 22,
 130         _TNL_ATTRIB_MAT_BACK_EMISSION = 23,
 131         _TNL_ATTRIB_MAT_FRONT_SHININESS = 24,
 132         _TNL_ATTRIB_MAT_BACK_SHININESS = 25,
 133         _TNL_ATTRIB_MAT_FRONT_INDEXES = 26,
 134         _TNL_ATTRIB_MAT_BACK_INDEXES = 27,
 135
 136         /* This is really a VERT_RESULT, not an attrib.  Need to fix
 137          * tnl to understand the difference.
 138          */
 139         _TNL_ATTRIB_POINTSIZE = 16,
 140
 141         _TNL_ATTRIB_MAX = 32
 142 } ;
 143
 144 #define _TNL_ATTRIB_TEX(u)       (_TNL_ATTRIB_TEX0 + (u))
 145 #define _TNL_ATTRIB_GENERIC(n) (_TNL_ATTRIB_GENERIC0 + (n))
 146
 147 /* special index used for handing invalid glVertexAttribute() indices */
 148 #define _TNL_ATTRIB_ERROR    (_TNL_ATTRIB_GENERIC15 + 1)
 149
 150 /**
 151  * Handy attribute ranges:
 152  */
 153 #define _TNL_FIRST_PROG      _TNL_ATTRIB_WEIGHT
 154 #define _TNL_LAST_PROG       _TNL_ATTRIB_TEX7
 155
 156 #define _TNL_FIRST_TEX       _TNL_ATTRIB_TEX0
 157 #define _TNL_LAST_TEX        _TNL_ATTRIB_TEX7
 158
 159 #define _TNL_FIRST_GENERIC _TNL_ATTRIB_GENERIC0
 160 #define _TNL_LAST_GENERIC  _TNL_ATTRIB_GENERIC15
 161
 162 #define _TNL_FIRST_MAT       _TNL_ATTRIB_MAT_FRONT_AMBIENT /* GENERIC0 */
 163 #define _TNL_LAST_MAT        _TNL_ATTRIB_MAT_BACK_INDEXES  /* GENERIC11 */
 164
 165 /* Number of available generic attributes */
 166 #define _TNL_NUM_GENERIC 16
 167
 168 /* Number of attributes used for evaluators */
 169 #define _TNL_NUM_EVAL 16
 170
 171
 172 #define PRIM_BEGIN     0x10
 173 #define PRIM_END       0x20
 174 #define PRIM_MODE_MASK 0x0f
 175
 176 static INLINE GLuint _tnl_translate_prim( const struct _mesa_prim *prim )
 177 {
 178    GLuint flag;
 179    flag = prim->mode;
 180    if (prim->begin) flag |= PRIM_BEGIN;
 181    if (prim->end) flag |= PRIM_END;
 182    return flag;
 183 }
 184
 185
 186
 187
 188 /**
 189  * Contains the current state of a running pipeline.
 190  */
 191 struct vertex_buffer
 192 {
 193    GLuint Size;  /**< Max vertices per vertex buffer, constant */
 194
 195    /* Constant over the pipeline.
 196     */
 197    GLuint Count;  /**< Number of vertices currently in buffer */
 198
 199    /* Pointers to current data.  Most of the data is in AttribPtr -- all of
 200     * it that is one of VERT_ATTRIB_X.  For things only produced by TNL,
 201     * such as backface color or eye-space coordinates, they are stored
 202     * here.
 203     */
 204    GLuint      *Elts;
 205    GLvector4f  *EyePtr;                         /* _TNL_BIT_POS */
 206    GLvector4f  *ClipPtr;                        /* _TNL_BIT_POS */
 207    GLvector4f  *NdcPtr;                         /* _TNL_BIT_POS */
 208    GLubyte     ClipOrMask;                      /* _TNL_BIT_POS */
 209    GLubyte     ClipAndMask;                     /* _TNL_BIT_POS */
 210    GLubyte     *ClipMask;                       /* _TNL_BIT_POS */
 211    GLfloat     *NormalLengthPtr;                /* _TNL_BIT_NORMAL */
 212    GLboolean   *EdgeFlag;                       /* _TNL_BIT_EDGEFLAG */
 213    GLvector4f  *BackfaceIndexPtr;
 214    GLvector4f  *BackfaceColorPtr;
 215    GLvector4f  *BackfaceSecondaryColorPtr;
 216
 217    const struct _mesa_prim  *Primitive;
 218    GLuint      PrimitiveCount;
 219
 220    /* Inputs to the vertex program stage */
 221    GLvector4f *AttribPtr[_TNL_ATTRIB_MAX];      /* GL_NV_vertex_program */
 222 };
 223
 224
 225 /**
 226  * Describes an individual operation on the pipeline.
 227  */
 228 struct tnl_pipeline_stage
 229 {
 230    const char *name;
 231
 232    /* Private data for the pipeline stage:
 233     */
 234    void *privatePtr;
 235
 236    /* Allocate private data
 237     */
 238    GLboolean (*create)( struct gl_context *ctx, struct tnl_pipeline_stage * );
 239
 240    /* Free private data.
 241     */
 242    void (*destroy)( struct tnl_pipeline_stage * );
 243
 244    /* Called on any statechange or input array size change or
 245     * input array change to/from zero stride.
 246     */
 247    void (*validate)( struct gl_context *ctx, struct tnl_pipeline_stage * );
 248
 249    /* Called from _tnl_run_pipeline().  The stage.changed_inputs value
 250     * encodes all inputs to thee struct which have changed.  If
 251     * non-zero, recompute all affected outputs of the stage, otherwise
 252     * execute any 'sideeffects' of the stage.
 253     *
 254     * Return value: GL_TRUE - keep going
 255     *               GL_FALSE - finished pipeline
 256     */
 257    GLboolean (*run)( struct gl_context *ctx, struct tnl_pipeline_stage * );
 258 };
 259
 260
 261
 262 /** Contains the array of all pipeline stages.
 263  * The default values are defined at the end of t_pipeline.c
 264  */
 265 struct tnl_pipeline {
 266
 267    GLuint last_attrib_stride[_TNL_ATTRIB_MAX];
 268    GLuint last_attrib_size[_TNL_ATTRIB_MAX];
 269    GLuint input_changes;
 270    GLuint new_state;
 271
 272    struct tnl_pipeline_stage stages[MAX_PIPELINE_STAGES+1];
 273    GLuint nr_stages;
 274 };
 275
 276 struct tnl_clipspace;
 277 struct tnl_clipspace_attr;
 278
 279 typedef void (*tnl_extract_func)( const struct tnl_clipspace_attr *a,
 280                                   GLfloat *out,
 281                                   const GLubyte *v );
 282
 283 typedef void (*tnl_insert_func)( const struct tnl_clipspace_attr *a,
 284                                  GLubyte *v,
 285                                  const GLfloat *in );
 286
 287 typedef void (*tnl_emit_func)( struct gl_context *ctx,
 288                                GLuint count,
 289                                GLubyte *dest );
 290
 291
 292 /**
 293  * Describes how to convert/move a vertex attribute from a vertex array
 294  * to a vertex structure.
 295  */
 296 struct tnl_clipspace_attr
 297 {
 298    GLuint attrib;          /* which vertex attrib (0=position, etc) */
 299    GLuint format;
 300    GLuint vertoffset;      /* position of the attrib in the vertex struct */
 301    GLuint vertattrsize;    /* size of the attribute in bytes */
 302    GLubyte *inputptr;
 303    GLuint inputstride;
 304    GLuint inputsize;
 305    const tnl_insert_func *insert;
 306    tnl_insert_func emit;
 307    tnl_extract_func extract;
 308    const GLfloat *vp;   /* NDC->Viewport mapping matrix */
 309 };
 310
 311
 312
 313
 314 typedef void (*tnl_points_func)( struct gl_context *ctx, GLuint first, GLuint last );
 315 typedef void (*tnl_line_func)( struct gl_context *ctx, GLuint v1, GLuint v2 );
 316 typedef void (*tnl_triangle_func)( struct gl_context *ctx,
 317                                    GLuint v1, GLuint v2, GLuint v3 );
 318 typedef void (*tnl_quad_func)( struct gl_context *ctx, GLuint v1, GLuint v2,
 319                                GLuint v3, GLuint v4 );
 320 typedef void (*tnl_render_func)( struct gl_context *ctx, GLuint start, GLuint count,
 321                                  GLuint flags );
 322 typedef void (*tnl_interp_func)( struct gl_context *ctx,
 323                                  GLfloat t, GLuint dst, GLuint out, GLuint in,
 324                                  GLboolean force_boundary );
 325 typedef void (*tnl_copy_pv_func)( struct gl_context *ctx, GLuint dst, GLuint src );
 326 typedef void (*tnl_setup_func)( struct gl_context *ctx,
 327                                 GLuint start, GLuint end,
 328                                 GLuint new_inputs);
 329
 330
 331 struct tnl_attr_type {
 332    GLuint format;
 333    GLuint size;
 334    GLuint stride;
 335    GLuint offset;
 336 };
 337
 338 struct tnl_clipspace_fastpath {
 339    GLuint vertex_size;
 340    GLuint attr_count;
 341    GLboolean match_strides;
 342
 343    struct tnl_attr_type *attr;
 344
 345    tnl_emit_func func;
 346    struct tnl_clipspace_fastpath *next;
 347 };
 348
 349 /**
 350  * Used to describe conversion of vertex arrays to vertex structures.
 351  * I.e. Structure of arrays to arrays of structs.
 352  */
 353 struct tnl_clipspace
 354 {
 355    GLboolean need_extras;
 356
 357    GLuint new_inputs;
 358
 359    GLubyte *vertex_buf;
 360    GLuint vertex_size;
 361    GLuint max_vertex_size;
 362
 363    struct tnl_clipspace_attr attr[_TNL_ATTRIB_MAX];
 364    GLuint attr_count;
 365
 366    tnl_emit_func emit;
 367    tnl_interp_func interp;
 368    tnl_copy_pv_func copy_pv;
 369
 370    /* Parameters and constants for codegen:
 371     */
 372    GLboolean need_viewport;
 373    GLfloat vp_scale[4];
 374    GLfloat vp_xlate[4];
 375    GLfloat chan_scale[4];
 376    GLfloat identity[4];
 377
 378    struct tnl_clipspace_fastpath *fastpath;
 379
 380    void (*codegen_emit)( struct gl_context *ctx );
 381 };
 382
 383
 384 struct tnl_device_driver
 385 {
 386    /***
 387     *** TNL Pipeline
 388     ***/
 389
 390    void (*RunPipeline)(struct gl_context *ctx);
 391    /* Replaces PipelineStart/PipelineFinish -- intended to allow
 392     * drivers to wrap _tnl_run_pipeline() with code to validate state
 393     * and grab/release hardware locks.
 394     */
 395
 396    void (*NotifyMaterialChange)(struct gl_context *ctx);
 397    /* Alert tnl-aware drivers of changes to material.
 398     */
 399
 400    /***
 401     *** Rendering -- These functions called only from t_vb_render.c
 402     ***/
 403    struct
 404    {
 405       void (*Start)(struct gl_context *ctx);
 406       void (*Finish)(struct gl_context *ctx);
 407       /* Called before and after all rendering operations, including DrawPixels,
 408        * ReadPixels, Bitmap, span functions, and CopyTexImage, etc commands.
 409        * These are a suitable place for grabbing/releasing hardware locks.
 410        */
 411
 412       void (*PrimitiveNotify)(struct gl_context *ctx, GLenum mode);
 413       /* Called between RenderStart() and RenderFinish() to indicate the
 414        * type of primitive we're about to draw.  Mode will be one of the
 415        * modes accepted by glBegin().
 416        */
 417
 418       tnl_interp_func Interp;
 419       /* The interp function is called by the clipping routines when we need
 420        * to generate an interpolated vertex.  All pertinant vertex ancilliary
 421        * data should be computed by interpolating between the 'in' and 'out'
 422        * vertices.
 423        */
 424
 425       tnl_copy_pv_func CopyPV;
 426       /* The copy function is used to make a copy of a vertex.  All pertinant
 427        * vertex attributes should be copied.
 428        */
 429
 430       void (*ClippedPolygon)( struct gl_context *ctx, const GLuint *elts, GLuint n );
 431       /* Render a polygon with <n> vertices whose indexes are in the <elts>
 432        * array.
 433        */
 434
 435       void (*ClippedLine)( struct gl_context *ctx, GLuint v0, GLuint v1 );
 436       /* Render a line between the two vertices given by indexes v0 and v1. */
 437
 438       tnl_points_func           Points; /* must now respect vb->elts */
 439       tnl_line_func             Line;
 440       tnl_triangle_func         Triangle;
 441       tnl_quad_func             Quad;
 442       /* These functions are called in order to render points, lines,
 443        * triangles and quads.  These are only called via the T&L module.
 444        */
 445
 446       tnl_render_func          *PrimTabVerts;
 447       tnl_render_func          *PrimTabElts;
 448       /* Render whole unclipped primitives (points, lines, linestrips,
 449        * lineloops, etc).  The tables are indexed by the GL enum of the
 450        * primitive to be rendered.  RenderTabVerts is used for non-indexed
 451        * arrays of vertices.  RenderTabElts is used for indexed arrays of
 452        * vertices.
 453        */
 454
 455       void (*ResetLineStipple)( struct gl_context *ctx );
 456       /* Reset the hardware's line stipple counter.
 457        */
 458
 459       tnl_setup_func BuildVertices;
 460       /* This function is called whenever new vertices are required for
 461        * rendering.  The vertices in question are those n such that start
 462        * <= n < end.  The new_inputs parameter indicates those fields of
 463        * the vertex which need to be updated, if only a partial repair of
 464        * the vertex is required.
 465        *
 466        * This function is called only from _tnl_render_stage in tnl/t_render.c.
 467        */
 468
 469
 470       GLboolean (*Multipass)( struct gl_context *ctx, GLuint passno );
 471       /* Driver may request additional render passes by returning GL_TRUE
 472        * when this function is called.  This function will be called
 473        * after the first pass, and passes will be made until the function
 474        * returns GL_FALSE.  If no function is registered, only one pass
 475        * is made.
 476        *
 477        * This function will be first invoked with passno == 1.
 478        */
 479    } Render;
 480 };
 481
 482
 483 #define DECLARE_RENDERINPUTS(name) BITSET64_DECLARE(name, _TNL_ATTRIB_MAX)
 484 #define RENDERINPUTS_COPY BITSET64_COPY
 485 #define RENDERINPUTS_EQUAL BITSET64_EQUAL
 486 #define RENDERINPUTS_ZERO BITSET64_ZERO
 487 #define RENDERINPUTS_ONES BITSET64_ONES
 488 #define RENDERINPUTS_TEST BITSET64_TEST
 489 #define RENDERINPUTS_SET BITSET64_SET
 490 #define RENDERINPUTS_CLEAR BITSET64_CLEAR
 491 #define RENDERINPUTS_TEST_RANGE BITSET64_TEST_RANGE
 492 #define RENDERINPUTS_SET_RANGE BITSET64_SET_RANGE
 493 #define RENDERINPUTS_CLEAR_RANGE BITSET64_CLEAR_RANGE
 494
 495
 496 /**
 497  * Context state for T&L context.
 498  */
 499 typedef struct
 500 {
 501    /* Driver interface.
 502     */
 503    struct tnl_device_driver Driver;
 504
 505    /* Pipeline
 506     */
 507    struct tnl_pipeline pipeline;
 508    struct vertex_buffer vb;
 509
 510    /* Clipspace/ndc/window vertex managment:
 511     */
 512    struct tnl_clipspace clipspace;
 513
 514    /* Probably need a better configuration mechanism:
 515     */
 516    GLboolean NeedNdcCoords;
 517    GLboolean AllowVertexFog;
 518    GLboolean AllowPixelFog;
 519    GLboolean _DoVertexFog;  /* eval fog function at each vertex? */
 520
 521    DECLARE_RENDERINPUTS(render_inputs_bitset);
 522
 523    GLvector4f tmp_inputs[VERT_ATTRIB_MAX];
 524
 525    /* Temp storage for t_draw.c:
 526     */
 527    GLubyte *block[VERT_ATTRIB_MAX];
 528    GLuint nr_blocks;
 529
 530 } TNLcontext;
 531
 532
 533
 534 #define TNL_CONTEXT(ctx) ((TNLcontext *)((ctx)->swtnl_context))
 535
 536
 537 #define TYPE_IDX(t) ((t) & 0xf)
 538 #define MAX_TYPES TYPE_IDX(GL_DOUBLE)+1      /* 0xa + 1 */
 539
 540
 541 extern void
 542 tnl_clip_prepare(struct gl_context *ctx);
 543
 544
 545 #endif