2 * mesa 3-D graphics library
4 * Copyright (C) 1999-2006 Brian Paul All Rights Reserved.
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27 * \brief TnL module datatypes and definitions.
28 * \author Keith Whitwell
33 * \mainpage The TNL-module
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.
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.
52 #include "main/glheader.h"
53 #include "main/imports.h"
54 #include "main/mtypes.h"
56 #include "math/m_vector.h"
60 #define MAX_PIPELINE_STAGES 30
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.
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.
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*
84 _TNL_ATTRIB_COLOR_INDEX
,
95 /* This is really a VARYING_SLOT, not an attrib. Need to fix
96 * tnl to understand the difference.
98 _TNL_ATTRIB_POINTSIZE
,
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
,
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.
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
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
,
143 #define _TNL_ATTRIB_TEX(u) (_TNL_ATTRIB_TEX0 + (u))
144 #define _TNL_ATTRIB_GENERIC(n) (_TNL_ATTRIB_GENERIC0 + (n))
146 /* special index used for handing invalid glVertexAttribute() indices */
147 #define _TNL_ATTRIB_ERROR (_TNL_ATTRIB_GENERIC15 + 1)
150 * Handy attribute ranges:
152 #define _TNL_FIRST_PROG _TNL_ATTRIB_NORMAL
153 #define _TNL_LAST_PROG _TNL_ATTRIB_TEX7
155 #define _TNL_FIRST_TEX _TNL_ATTRIB_TEX0
156 #define _TNL_LAST_TEX _TNL_ATTRIB_TEX7
158 #define _TNL_FIRST_GENERIC _TNL_ATTRIB_GENERIC0
159 #define _TNL_LAST_GENERIC _TNL_ATTRIB_GENERIC15
161 #define _TNL_FIRST_MAT _TNL_ATTRIB_MAT_FRONT_AMBIENT /* GENERIC0 */
162 #define _TNL_LAST_MAT _TNL_ATTRIB_MAT_BACK_INDEXES /* GENERIC11 */
164 /* Number of available texture attributes */
165 #define _TNL_NUM_TEX 8
167 /* Number of available generic attributes */
168 #define _TNL_NUM_GENERIC 16
170 /* Number of attributes used for evaluators */
171 #define _TNL_NUM_EVAL 16
174 #define PRIM_BEGIN 0x10
175 #define PRIM_END 0x20
176 #define PRIM_MODE_MASK 0x0f
178 static inline GLuint
_tnl_translate_prim( const struct _mesa_prim
*prim
)
182 if (prim
->begin
) flag
|= PRIM_BEGIN
;
183 if (prim
->end
) flag
|= PRIM_END
;
191 * Contains the current state of a running pipeline.
195 GLuint Size
; /**< Max vertices per vertex buffer, constant */
197 /* Constant over the pipeline.
199 GLuint Count
; /**< Number of vertices currently in buffer */
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
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
;
219 const struct _mesa_prim
*Primitive
;
220 GLuint PrimitiveCount
;
222 /* Inputs to the vertex program stage */
223 GLvector4f
*AttribPtr
[_TNL_ATTRIB_MAX
];
228 * Describes an individual operation on the pipeline.
230 struct tnl_pipeline_stage
234 /* Private data for the pipeline stage:
238 /* Allocate private data
240 GLboolean (*create
)( struct gl_context
*ctx
, struct tnl_pipeline_stage
* );
242 /* Free private data.
244 void (*destroy
)( struct tnl_pipeline_stage
* );
246 /* Called on any statechange or input array size change or
247 * input array change to/from zero stride.
249 void (*validate
)( struct gl_context
*ctx
, struct tnl_pipeline_stage
* );
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.
256 * Return value: GL_TRUE - keep going
257 * GL_FALSE - finished pipeline
259 GLboolean (*run
)( struct gl_context
*ctx
, struct tnl_pipeline_stage
* );
264 /** Contains the array of all pipeline stages.
265 * The default values are defined at the end of t_pipeline.c
267 struct tnl_pipeline
{
269 GLuint last_attrib_stride
[_TNL_ATTRIB_MAX
];
270 GLuint last_attrib_size
[_TNL_ATTRIB_MAX
];
271 GLuint input_changes
;
274 struct tnl_pipeline_stage stages
[MAX_PIPELINE_STAGES
+1];
278 struct tnl_clipspace
;
279 struct tnl_clipspace_attr
;
281 typedef void (*tnl_extract_func
)( const struct tnl_clipspace_attr
*a
,
285 typedef void (*tnl_insert_func
)( const struct tnl_clipspace_attr
*a
,
289 typedef void (*tnl_emit_func
)( struct gl_context
*ctx
,
295 * Describes how to convert/move a vertex attribute from a vertex array
296 * to a vertex structure.
298 struct tnl_clipspace_attr
300 GLuint attrib
; /* which vertex attrib (0=position, etc) */
302 GLuint vertoffset
; /* position of the attrib in the vertex struct */
303 GLuint vertattrsize
; /* size of the attribute in bytes */
307 const tnl_insert_func
*insert
;
308 tnl_insert_func emit
;
309 tnl_extract_func extract
;
310 const GLfloat
*vp
; /* NDC->Viewport mapping matrix */
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
,
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
,
333 struct tnl_attr_type
{
340 struct tnl_clipspace_fastpath
{
343 GLboolean match_strides
;
345 struct tnl_attr_type
*attr
;
348 struct tnl_clipspace_fastpath
*next
;
352 * Used to describe conversion of vertex arrays to vertex structures.
353 * I.e. Structure of arrays to arrays of structs.
357 GLboolean need_extras
;
363 GLuint max_vertex_size
;
365 struct tnl_clipspace_attr attr
[_TNL_ATTRIB_MAX
];
369 tnl_interp_func interp
;
370 tnl_copy_pv_func copy_pv
;
372 /* Parameters and constants for codegen:
374 GLboolean need_viewport
;
377 GLfloat chan_scale
[4];
380 struct tnl_clipspace_fastpath
*fastpath
;
382 void (*codegen_emit
)( struct gl_context
*ctx
);
386 #define SHINE_TABLE_SIZE 256 /**< Material shininess lookup table sizes */
389 * Material shininess lookup table.
393 struct tnl_shine_tab
*next
, *prev
;
394 GLfloat tab
[SHINE_TABLE_SIZE
+1];
400 struct tnl_device_driver
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.
412 void (*NotifyMaterialChange
)(struct gl_context
*ctx
);
413 /* Alert tnl-aware drivers of changes to material.
417 *** Rendering -- These functions called only from t_vb_render.c
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.
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().
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'
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.
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>
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. */
454 tnl_points_func Points
; /* must now respect vb->elts */
456 tnl_triangle_func Triangle
;
458 /* These functions are called in order to render points, lines,
459 * triangles and quads. These are only called via the T&L module.
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
471 void (*ResetLineStipple
)( struct gl_context
*ctx
);
472 /* Reset the hardware's line stipple counter.
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.
482 * This function is called only from _tnl_render_stage in tnl/t_render.c.
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
493 * This function will be first invoked with passno == 1.
500 * Context state for T&L context.
506 struct tnl_device_driver Driver
;
510 struct tnl_pipeline pipeline
;
511 struct vertex_buffer vb
;
513 /* Clipspace/ndc/window vertex managment:
515 struct tnl_clipspace clipspace
;
518 /* Probably need a better configuration mechanism:
520 GLboolean NeedNdcCoords
;
521 GLboolean AllowVertexFog
;
522 GLboolean AllowPixelFog
;
523 GLboolean _DoVertexFog
; /* eval fog function at each vertex? */
525 GLbitfield64 render_inputs_bitset
;
527 GLvector4f tmp_inputs
[VERT_ATTRIB_MAX
];
529 /* Temp storage for t_draw.c:
531 GLubyte
*block
[VERT_ATTRIB_MAX
];
536 struct tnl_shine_tab
*_ShineTable
[2]; /**< Active shine tables */
537 struct tnl_shine_tab
*_ShineTabList
; /**< MRU list of inactive shine tables */
543 #define TNL_CONTEXT(ctx) ((TNLcontext *)((ctx)->swtnl_context))
546 #define TYPE_IDX(t) ((t) & 0xf)
547 #define MAX_TYPES TYPE_IDX(GL_DOUBLE)+1 /* 0xa + 1 */
551 tnl_clip_prepare(struct gl_context
*ctx
);