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/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 = 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 = 17, /* doesn't really exist! */ 97 _TNL_ATTRIB_GENERIC1 = 18, 98 _TNL_ATTRIB_GENERIC2 = 19, 99 _TNL_ATTRIB_GENERIC3 = 20, 100 _TNL_ATTRIB_GENERIC4 = 21, 101 _TNL_ATTRIB_GENERIC5 = 22, 102 _TNL_ATTRIB_GENERIC6 = 23, 103 _TNL_ATTRIB_GENERIC7 = 24, 104 _TNL_ATTRIB_GENERIC8 = 25, 105 _TNL_ATTRIB_GENERIC9 = 26, 106 _TNL_ATTRIB_GENERIC10 = 27, 107 _TNL_ATTRIB_GENERIC11 = 28, 108 _TNL_ATTRIB_GENERIC12 = 29, 109 _TNL_ATTRIB_GENERIC13 = 30, 110 _TNL_ATTRIB_GENERIC14 = 31, 111 _TNL_ATTRIB_GENERIC15 = 32, 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 = 17, 124 _TNL_ATTRIB_MAT_BACK_AMBIENT = 18, 125 _TNL_ATTRIB_MAT_FRONT_DIFFUSE = 19, 126 _TNL_ATTRIB_MAT_BACK_DIFFUSE = 20, 127 _TNL_ATTRIB_MAT_FRONT_SPECULAR = 21, 128 _TNL_ATTRIB_MAT_BACK_SPECULAR = 22, 129 _TNL_ATTRIB_MAT_FRONT_EMISSION = 23, 130 _TNL_ATTRIB_MAT_BACK_EMISSION = 24, 131 _TNL_ATTRIB_MAT_FRONT_SHININESS = 25, 132 _TNL_ATTRIB_MAT_BACK_SHININESS = 26, 133 _TNL_ATTRIB_MAT_FRONT_INDEXES = 27, 134 _TNL_ATTRIB_MAT_BACK_INDEXES = 28, 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 = 33 142 } ; 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 texture attributes */ 166 #define _TNL_NUM_TEX 8 167 168 /* Number of available generic attributes */ 169 #define _TNL_NUM_GENERIC 16 170 171 /* Number of attributes used for evaluators */ 172 #define _TNL_NUM_EVAL 16 173 174 175 #define PRIM_BEGIN 0x10 176 #define PRIM_END 0x20 177 #define PRIM_MODE_MASK 0x0f 178 _tnl_translate_prim(const struct _mesa_prim * prim)179 static inline GLuint _tnl_translate_prim( const struct _mesa_prim *prim ) 180 { 181 GLuint flag; 182 flag = prim->mode; 183 if (prim->begin) flag |= PRIM_BEGIN; 184 if (prim->end) flag |= PRIM_END; 185 return flag; 186 } 187 188 189 190 191 /** 192 * Contains the current state of a running pipeline. 193 */ 194 struct vertex_buffer 195 { 196 GLuint Size; /**< Max vertices per vertex buffer, constant */ 197 198 /* Constant over the pipeline. 199 */ 200 GLuint Count; /**< Number of vertices currently in buffer */ 201 202 /* Pointers to current data. Most of the data is in AttribPtr -- all of 203 * it that is one of VERT_ATTRIB_X. For things only produced by TNL, 204 * such as backface color or eye-space coordinates, they are stored 205 * here. 206 */ 207 GLuint *Elts; 208 GLvector4f *EyePtr; /* _TNL_BIT_POS */ 209 GLvector4f *ClipPtr; /* _TNL_BIT_POS */ 210 GLvector4f *NdcPtr; /* _TNL_BIT_POS */ 211 GLubyte ClipOrMask; /* _TNL_BIT_POS */ 212 GLubyte ClipAndMask; /* _TNL_BIT_POS */ 213 GLubyte *ClipMask; /* _TNL_BIT_POS */ 214 GLfloat *NormalLengthPtr; /* _TNL_BIT_NORMAL */ 215 GLboolean *EdgeFlag; /* _TNL_BIT_EDGEFLAG */ 216 GLvector4f *BackfaceIndexPtr; 217 GLvector4f *BackfaceColorPtr; 218 GLvector4f *BackfaceSecondaryColorPtr; 219 220 const struct _mesa_prim *Primitive; 221 GLuint PrimitiveCount; 222 223 /* Inputs to the vertex program stage */ 224 GLvector4f *AttribPtr[_TNL_ATTRIB_MAX]; /* GL_NV_vertex_program */ 225 }; 226 227 228 /** 229 * Describes an individual operation on the pipeline. 230 */ 231 struct tnl_pipeline_stage 232 { 233 const char *name; 234 235 /* Private data for the pipeline stage: 236 */ 237 void *privatePtr; 238 239 /* Allocate private data 240 */ 241 GLboolean (*create)( struct gl_context *ctx, struct tnl_pipeline_stage * ); 242 243 /* Free private data. 244 */ 245 void (*destroy)( struct tnl_pipeline_stage * ); 246 247 /* Called on any statechange or input array size change or 248 * input array change to/from zero stride. 249 */ 250 void (*validate)( struct gl_context *ctx, struct tnl_pipeline_stage * ); 251 252 /* Called from _tnl_run_pipeline(). The stage.changed_inputs value 253 * encodes all inputs to thee struct which have changed. If 254 * non-zero, recompute all affected outputs of the stage, otherwise 255 * execute any 'sideeffects' of the stage. 256 * 257 * Return value: GL_TRUE - keep going 258 * GL_FALSE - finished pipeline 259 */ 260 GLboolean (*run)( struct gl_context *ctx, struct tnl_pipeline_stage * ); 261 }; 262 263 264 265 /** Contains the array of all pipeline stages. 266 * The default values are defined at the end of t_pipeline.c 267 */ 268 struct tnl_pipeline { 269 270 GLuint last_attrib_stride[_TNL_ATTRIB_MAX]; 271 GLuint last_attrib_size[_TNL_ATTRIB_MAX]; 272 GLuint input_changes; 273 GLuint new_state; 274 275 struct tnl_pipeline_stage stages[MAX_PIPELINE_STAGES+1]; 276 GLuint nr_stages; 277 }; 278 279 struct tnl_clipspace; 280 struct tnl_clipspace_attr; 281 282 typedef void (*tnl_extract_func)( const struct tnl_clipspace_attr *a, 283 GLfloat *out, 284 const GLubyte *v ); 285 286 typedef void (*tnl_insert_func)( const struct tnl_clipspace_attr *a, 287 GLubyte *v, 288 const GLfloat *in ); 289 290 typedef void (*tnl_emit_func)( struct gl_context *ctx, 291 GLuint count, 292 GLubyte *dest ); 293 294 295 /** 296 * Describes how to convert/move a vertex attribute from a vertex array 297 * to a vertex structure. 298 */ 299 struct tnl_clipspace_attr 300 { 301 GLuint attrib; /* which vertex attrib (0=position, etc) */ 302 GLuint format; 303 GLuint vertoffset; /* position of the attrib in the vertex struct */ 304 GLuint vertattrsize; /* size of the attribute in bytes */ 305 GLubyte *inputptr; 306 GLuint inputstride; 307 GLuint inputsize; 308 const tnl_insert_func *insert; 309 tnl_insert_func emit; 310 tnl_extract_func extract; 311 const GLfloat *vp; /* NDC->Viewport mapping matrix */ 312 }; 313 314 315 316 317 typedef void (*tnl_points_func)( struct gl_context *ctx, GLuint first, GLuint last ); 318 typedef void (*tnl_line_func)( struct gl_context *ctx, GLuint v1, GLuint v2 ); 319 typedef void (*tnl_triangle_func)( struct gl_context *ctx, 320 GLuint v1, GLuint v2, GLuint v3 ); 321 typedef void (*tnl_quad_func)( struct gl_context *ctx, GLuint v1, GLuint v2, 322 GLuint v3, GLuint v4 ); 323 typedef void (*tnl_render_func)( struct gl_context *ctx, GLuint start, GLuint count, 324 GLuint flags ); 325 typedef void (*tnl_interp_func)( struct gl_context *ctx, 326 GLfloat t, GLuint dst, GLuint out, GLuint in, 327 GLboolean force_boundary ); 328 typedef void (*tnl_copy_pv_func)( struct gl_context *ctx, GLuint dst, GLuint src ); 329 typedef void (*tnl_setup_func)( struct gl_context *ctx, 330 GLuint start, GLuint end, 331 GLuint new_inputs); 332 333 334 struct tnl_attr_type { 335 GLuint format; 336 GLuint size; 337 GLuint stride; 338 GLuint offset; 339 }; 340 341 struct tnl_clipspace_fastpath { 342 GLuint vertex_size; 343 GLuint attr_count; 344 GLboolean match_strides; 345 346 struct tnl_attr_type *attr; 347 348 tnl_emit_func func; 349 struct tnl_clipspace_fastpath *next; 350 }; 351 352 /** 353 * Used to describe conversion of vertex arrays to vertex structures. 354 * I.e. Structure of arrays to arrays of structs. 355 */ 356 struct tnl_clipspace 357 { 358 GLboolean need_extras; 359 360 GLuint new_inputs; 361 362 GLubyte *vertex_buf; 363 GLuint vertex_size; 364 GLuint max_vertex_size; 365 366 struct tnl_clipspace_attr attr[_TNL_ATTRIB_MAX]; 367 GLuint attr_count; 368 369 tnl_emit_func emit; 370 tnl_interp_func interp; 371 tnl_copy_pv_func copy_pv; 372 373 /* Parameters and constants for codegen: 374 */ 375 GLboolean need_viewport; 376 GLfloat vp_scale[4]; 377 GLfloat vp_xlate[4]; 378 GLfloat chan_scale[4]; 379 GLfloat identity[4]; 380 381 struct tnl_clipspace_fastpath *fastpath; 382 383 void (*codegen_emit)( struct gl_context *ctx ); 384 }; 385 386 387 #define SHINE_TABLE_SIZE 256 /**< Material shininess lookup table sizes */ 388 389 /** 390 * Material shininess lookup table. 391 */ 392 struct tnl_shine_tab 393 { 394 struct tnl_shine_tab *next, *prev; 395 GLfloat tab[SHINE_TABLE_SIZE+1]; 396 GLfloat shininess; 397 GLuint refcount; 398 }; 399 400 401 struct tnl_device_driver 402 { 403 /*** 404 *** TNL Pipeline 405 ***/ 406 407 void (*RunPipeline)(struct gl_context *ctx); 408 /* Replaces PipelineStart/PipelineFinish -- intended to allow 409 * drivers to wrap _tnl_run_pipeline() with code to validate state 410 * and grab/release hardware locks. 411 */ 412 413 void (*NotifyMaterialChange)(struct gl_context *ctx); 414 /* Alert tnl-aware drivers of changes to material. 415 */ 416 417 /*** 418 *** Rendering -- These functions called only from t_vb_render.c 419 ***/ 420 struct 421 { 422 void (*Start)(struct gl_context *ctx); 423 void (*Finish)(struct gl_context *ctx); 424 /* Called before and after all rendering operations, including DrawPixels, 425 * ReadPixels, Bitmap, span functions, and CopyTexImage, etc commands. 426 * These are a suitable place for grabbing/releasing hardware locks. 427 */ 428 429 void (*PrimitiveNotify)(struct gl_context *ctx, GLenum mode); 430 /* Called between RenderStart() and RenderFinish() to indicate the 431 * type of primitive we're about to draw. Mode will be one of the 432 * modes accepted by glBegin(). 433 */ 434 435 tnl_interp_func Interp; 436 /* The interp function is called by the clipping routines when we need 437 * to generate an interpolated vertex. All pertinant vertex ancilliary 438 * data should be computed by interpolating between the 'in' and 'out' 439 * vertices. 440 */ 441 442 tnl_copy_pv_func CopyPV; 443 /* The copy function is used to make a copy of a vertex. All pertinant 444 * vertex attributes should be copied. 445 */ 446 447 void (*ClippedPolygon)( struct gl_context *ctx, const GLuint *elts, GLuint n ); 448 /* Render a polygon with <n> vertices whose indexes are in the <elts> 449 * array. 450 */ 451 452 void (*ClippedLine)( struct gl_context *ctx, GLuint v0, GLuint v1 ); 453 /* Render a line between the two vertices given by indexes v0 and v1. */ 454 455 tnl_points_func Points; /* must now respect vb->elts */ 456 tnl_line_func Line; 457 tnl_triangle_func Triangle; 458 tnl_quad_func Quad; 459 /* These functions are called in order to render points, lines, 460 * triangles and quads. These are only called via the T&L module. 461 */ 462 463 tnl_render_func *PrimTabVerts; 464 tnl_render_func *PrimTabElts; 465 /* Render whole unclipped primitives (points, lines, linestrips, 466 * lineloops, etc). The tables are indexed by the GL enum of the 467 * primitive to be rendered. RenderTabVerts is used for non-indexed 468 * arrays of vertices. RenderTabElts is used for indexed arrays of 469 * vertices. 470 */ 471 472 void (*ResetLineStipple)( struct gl_context *ctx ); 473 /* Reset the hardware's line stipple counter. 474 */ 475 476 tnl_setup_func BuildVertices; 477 /* This function is called whenever new vertices are required for 478 * rendering. The vertices in question are those n such that start 479 * <= n < end. The new_inputs parameter indicates those fields of 480 * the vertex which need to be updated, if only a partial repair of 481 * the vertex is required. 482 * 483 * This function is called only from _tnl_render_stage in tnl/t_render.c. 484 */ 485 486 487 GLboolean (*Multipass)( struct gl_context *ctx, GLuint passno ); 488 /* Driver may request additional render passes by returning GL_TRUE 489 * when this function is called. This function will be called 490 * after the first pass, and passes will be made until the function 491 * returns GL_FALSE. If no function is registered, only one pass 492 * is made. 493 * 494 * This function will be first invoked with passno == 1. 495 */ 496 } Render; 497 }; 498 499 500 /** 501 * Context state for T&L context. 502 */ 503 typedef struct 504 { 505 /* Driver interface. 506 */ 507 struct tnl_device_driver Driver; 508 509 /* Pipeline 510 */ 511 struct tnl_pipeline pipeline; 512 struct vertex_buffer vb; 513 514 /* Clipspace/ndc/window vertex managment: 515 */ 516 struct tnl_clipspace clipspace; 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 } TNLcontext; 540 541 542 543 #define TNL_CONTEXT(ctx) ((TNLcontext *)((ctx)->swtnl_context)) 544 545 546 #define TYPE_IDX(t) ((t) & 0xf) 547 #define MAX_TYPES TYPE_IDX(GL_DOUBLE)+1 /* 0xa + 1 */ 548 549 550 extern void 551 tnl_clip_prepare(struct gl_context *ctx); 552 553 554 #endif 555