2 * Mesa 3-D graphics library
5 * Copyright (C) 1999-2008 Brian Paul All Rights Reserved.
6 * Copyright (C) 2009 VMware, Inc. All Rights Reserved.
8 * Permission is hereby granted, free of charge, to any person obtaining a
9 * copy of this software and associated documentation files (the "Software"),
10 * to deal in the Software without restriction, including without limitation
11 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
12 * and/or sell copies of the Software, and to permit persons to whom the
13 * Software is furnished to do so, subject to the following conditions:
15 * The above copyright notice and this permission notice shall be included
16 * in all copies or substantial portions of the Software.
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
21 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
22 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
23 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
32 * -# 4x4 transformation matrices are stored in memory in column major order.
33 * -# Points/vertices are to be thought of as column vectors.
34 * -# Transformation of a point p by a matrix M is: p' = M * p
43 #include "mfeatures.h"
46 #include "math/m_matrix.h"
50 * Apply a perspective projection matrix.
52 * \param left left clipping plane coordinate.
53 * \param right right clipping plane coordinate.
54 * \param bottom bottom clipping plane coordinate.
55 * \param top top clipping plane coordinate.
56 * \param nearval distance to the near clipping plane.
57 * \param farval distance to the far clipping plane.
61 * Flushes vertices and validates parameters. Calls _math_matrix_frustum() with
62 * the top matrix of the current matrix stack and sets
63 * __struct gl_contextRec::NewState.
66 _mesa_Frustum( GLdouble left
, GLdouble right
,
67 GLdouble bottom
, GLdouble top
,
68 GLdouble nearval
, GLdouble farval
)
70 GET_CURRENT_CONTEXT(ctx
);
71 ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx
);
79 _mesa_error( ctx
, GL_INVALID_VALUE
, "glFrustum" );
83 _math_matrix_frustum( ctx
->CurrentStack
->Top
,
84 (GLfloat
) left
, (GLfloat
) right
,
85 (GLfloat
) bottom
, (GLfloat
) top
,
86 (GLfloat
) nearval
, (GLfloat
) farval
);
87 ctx
->NewState
|= ctx
->CurrentStack
->DirtyFlag
;
92 * Apply an orthographic projection matrix.
94 * \param left left clipping plane coordinate.
95 * \param right right clipping plane coordinate.
96 * \param bottom bottom clipping plane coordinate.
97 * \param top top clipping plane coordinate.
98 * \param nearval distance to the near clipping plane.
99 * \param farval distance to the far clipping plane.
103 * Flushes vertices and validates parameters. Calls _math_matrix_ortho() with
104 * the top matrix of the current matrix stack and sets
105 * __struct gl_contextRec::NewState.
108 _mesa_Ortho( GLdouble left
, GLdouble right
,
109 GLdouble bottom
, GLdouble top
,
110 GLdouble nearval
, GLdouble farval
)
112 GET_CURRENT_CONTEXT(ctx
);
113 ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx
);
115 if (MESA_VERBOSE
& VERBOSE_API
)
116 _mesa_debug(ctx
, "glOrtho(%f, %f, %f, %f, %f, %f)\n",
117 left
, right
, bottom
, top
, nearval
, farval
);
123 _mesa_error( ctx
, GL_INVALID_VALUE
, "glOrtho" );
127 _math_matrix_ortho( ctx
->CurrentStack
->Top
,
128 (GLfloat
) left
, (GLfloat
) right
,
129 (GLfloat
) bottom
, (GLfloat
) top
,
130 (GLfloat
) nearval
, (GLfloat
) farval
);
131 ctx
->NewState
|= ctx
->CurrentStack
->DirtyFlag
;
136 * Set the current matrix stack.
138 * \param mode matrix stack.
140 * \sa glMatrixMode().
142 * Flushes the vertices, validates the parameter and updates
143 * __struct gl_contextRec::CurrentStack and gl_transform_attrib::MatrixMode
144 * with the specified matrix stack.
147 _mesa_MatrixMode( GLenum mode
)
149 GET_CURRENT_CONTEXT(ctx
);
150 ASSERT_OUTSIDE_BEGIN_END(ctx
);
152 if (ctx
->Transform
.MatrixMode
== mode
&& mode
!= GL_TEXTURE
)
154 FLUSH_VERTICES(ctx
, _NEW_TRANSFORM
);
158 ctx
->CurrentStack
= &ctx
->ModelviewMatrixStack
;
161 ctx
->CurrentStack
= &ctx
->ProjectionMatrixStack
;
164 /* This error check is disabled because if we're called from
165 * glPopAttrib() when the active texture unit is >= MaxTextureCoordUnits
166 * we'll generate an unexpected error.
167 * From the GL_ARB_vertex_shader spec it sounds like we should instead
168 * do error checking in other places when we actually try to access
169 * texture matrices beyond MaxTextureCoordUnits.
172 if (ctx
->Texture
.CurrentUnit
>= ctx
->Const
.MaxTextureCoordUnits
) {
173 _mesa_error(ctx
, GL_INVALID_OPERATION
,
174 "glMatrixMode(invalid tex unit %d)",
175 ctx
->Texture
.CurrentUnit
);
179 ASSERT(ctx
->Texture
.CurrentUnit
< Elements(ctx
->TextureMatrixStack
));
180 ctx
->CurrentStack
= &ctx
->TextureMatrixStack
[ctx
->Texture
.CurrentUnit
];
190 if (ctx
->Extensions
.NV_vertex_program
) {
191 ctx
->CurrentStack
= &ctx
->ProgramMatrixStack
[mode
- GL_MATRIX0_NV
];
194 _mesa_error( ctx
, GL_INVALID_ENUM
, "glMatrixMode(mode)" );
206 if (ctx
->Extensions
.ARB_vertex_program
||
207 ctx
->Extensions
.ARB_fragment_program
) {
208 const GLuint m
= mode
- GL_MATRIX0_ARB
;
209 if (m
> ctx
->Const
.MaxProgramMatrices
) {
210 _mesa_error(ctx
, GL_INVALID_ENUM
,
211 "glMatrixMode(GL_MATRIX%d_ARB)", m
);
214 ctx
->CurrentStack
= &ctx
->ProgramMatrixStack
[m
];
217 _mesa_error( ctx
, GL_INVALID_ENUM
, "glMatrixMode(mode)" );
222 _mesa_error( ctx
, GL_INVALID_ENUM
, "glMatrixMode(mode)" );
226 ctx
->Transform
.MatrixMode
= mode
;
231 * Push the current matrix stack.
233 * \sa glPushMatrix().
235 * Verifies the current matrix stack is not full, and duplicates the top-most
236 * matrix in the stack.
237 * Marks __struct gl_contextRec::NewState with the stack dirty flag.
240 _mesa_PushMatrix( void )
242 GET_CURRENT_CONTEXT(ctx
);
243 struct gl_matrix_stack
*stack
= ctx
->CurrentStack
;
244 ASSERT_OUTSIDE_BEGIN_END(ctx
);
246 if (MESA_VERBOSE
&VERBOSE_API
)
247 _mesa_debug(ctx
, "glPushMatrix %s\n",
248 _mesa_lookup_enum_by_nr(ctx
->Transform
.MatrixMode
));
250 if (stack
->Depth
+ 1 >= stack
->MaxDepth
) {
251 if (ctx
->Transform
.MatrixMode
== GL_TEXTURE
) {
252 _mesa_error(ctx
, GL_STACK_OVERFLOW
,
253 "glPushMatrix(mode=GL_TEXTURE, unit=%d)",
254 ctx
->Texture
.CurrentUnit
);
257 _mesa_error(ctx
, GL_STACK_OVERFLOW
, "glPushMatrix(mode=%s)",
258 _mesa_lookup_enum_by_nr(ctx
->Transform
.MatrixMode
));
262 _math_matrix_copy( &stack
->Stack
[stack
->Depth
+ 1],
263 &stack
->Stack
[stack
->Depth
] );
265 stack
->Top
= &(stack
->Stack
[stack
->Depth
]);
266 ctx
->NewState
|= stack
->DirtyFlag
;
271 * Pop the current matrix stack.
275 * Flushes the vertices, verifies the current matrix stack is not empty, and
276 * moves the stack head down.
277 * Marks __struct gl_contextRec::NewState with the dirty stack flag.
280 _mesa_PopMatrix( void )
282 GET_CURRENT_CONTEXT(ctx
);
283 struct gl_matrix_stack
*stack
= ctx
->CurrentStack
;
284 ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx
);
286 if (MESA_VERBOSE
&VERBOSE_API
)
287 _mesa_debug(ctx
, "glPopMatrix %s\n",
288 _mesa_lookup_enum_by_nr(ctx
->Transform
.MatrixMode
));
290 if (stack
->Depth
== 0) {
291 if (ctx
->Transform
.MatrixMode
== GL_TEXTURE
) {
292 _mesa_error(ctx
, GL_STACK_UNDERFLOW
,
293 "glPopMatrix(mode=GL_TEXTURE, unit=%d)",
294 ctx
->Texture
.CurrentUnit
);
297 _mesa_error(ctx
, GL_STACK_UNDERFLOW
, "glPopMatrix(mode=%s)",
298 _mesa_lookup_enum_by_nr(ctx
->Transform
.MatrixMode
));
303 stack
->Top
= &(stack
->Stack
[stack
->Depth
]);
304 ctx
->NewState
|= stack
->DirtyFlag
;
309 * Replace the current matrix with the identity matrix.
311 * \sa glLoadIdentity().
313 * Flushes the vertices and calls _math_matrix_set_identity() with the
314 * top-most matrix in the current stack.
315 * Marks __struct gl_contextRec::NewState with the stack dirty flag.
318 _mesa_LoadIdentity( void )
320 GET_CURRENT_CONTEXT(ctx
);
321 ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx
);
323 if (MESA_VERBOSE
& VERBOSE_API
)
324 _mesa_debug(ctx
, "glLoadIdentity()\n");
326 _math_matrix_set_identity( ctx
->CurrentStack
->Top
);
327 ctx
->NewState
|= ctx
->CurrentStack
->DirtyFlag
;
332 * Replace the current matrix with a given matrix.
336 * \sa glLoadMatrixf().
338 * Flushes the vertices and calls _math_matrix_loadf() with the top-most
339 * matrix in the current stack and the given matrix.
340 * Marks __struct gl_contextRec::NewState with the dirty stack flag.
343 _mesa_LoadMatrixf( const GLfloat
*m
)
345 GET_CURRENT_CONTEXT(ctx
);
347 if (MESA_VERBOSE
& VERBOSE_API
)
349 "glLoadMatrix(%f %f %f %f, %f %f %f %f, %f %f %f %f, %f %f %f %f\n",
350 m
[0], m
[4], m
[8], m
[12],
351 m
[1], m
[5], m
[9], m
[13],
352 m
[2], m
[6], m
[10], m
[14],
353 m
[3], m
[7], m
[11], m
[15]);
355 ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx
);
356 _math_matrix_loadf( ctx
->CurrentStack
->Top
, m
);
357 ctx
->NewState
|= ctx
->CurrentStack
->DirtyFlag
;
362 * Multiply the current matrix with a given matrix.
366 * \sa glMultMatrixf().
368 * Flushes the vertices and calls _math_matrix_mul_floats() with the top-most
369 * matrix in the current stack and the given matrix. Marks
370 * __struct gl_contextRec::NewState with the dirty stack flag.
373 _mesa_MultMatrixf( const GLfloat
*m
)
375 GET_CURRENT_CONTEXT(ctx
);
377 if (MESA_VERBOSE
& VERBOSE_API
)
379 "glMultMatrix(%f %f %f %f, %f %f %f %f, %f %f %f %f, %f %f %f %f\n",
380 m
[0], m
[4], m
[8], m
[12],
381 m
[1], m
[5], m
[9], m
[13],
382 m
[2], m
[6], m
[10], m
[14],
383 m
[3], m
[7], m
[11], m
[15]);
384 ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx
);
385 _math_matrix_mul_floats( ctx
->CurrentStack
->Top
, m
);
386 ctx
->NewState
|= ctx
->CurrentStack
->DirtyFlag
;
391 * Multiply the current matrix with a rotation matrix.
393 * \param angle angle of rotation, in degrees.
394 * \param x rotation vector x coordinate.
395 * \param y rotation vector y coordinate.
396 * \param z rotation vector z coordinate.
400 * Flushes the vertices and calls _math_matrix_rotate() with the top-most
401 * matrix in the current stack and the given parameters. Marks
402 * __struct gl_contextRec::NewState with the dirty stack flag.
405 _mesa_Rotatef( GLfloat angle
, GLfloat x
, GLfloat y
, GLfloat z
)
407 GET_CURRENT_CONTEXT(ctx
);
408 ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx
);
410 _math_matrix_rotate( ctx
->CurrentStack
->Top
, angle
, x
, y
, z
);
411 ctx
->NewState
|= ctx
->CurrentStack
->DirtyFlag
;
417 * Multiply the current matrix with a general scaling matrix.
419 * \param x x axis scale factor.
420 * \param y y axis scale factor.
421 * \param z z axis scale factor.
425 * Flushes the vertices and calls _math_matrix_scale() with the top-most
426 * matrix in the current stack and the given parameters. Marks
427 * __struct gl_contextRec::NewState with the dirty stack flag.
430 _mesa_Scalef( GLfloat x
, GLfloat y
, GLfloat z
)
432 GET_CURRENT_CONTEXT(ctx
);
433 ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx
);
434 _math_matrix_scale( ctx
->CurrentStack
->Top
, x
, y
, z
);
435 ctx
->NewState
|= ctx
->CurrentStack
->DirtyFlag
;
440 * Multiply the current matrix with a translation matrix.
442 * \param x translation vector x coordinate.
443 * \param y translation vector y coordinate.
444 * \param z translation vector z coordinate.
446 * \sa glTranslatef().
448 * Flushes the vertices and calls _math_matrix_translate() with the top-most
449 * matrix in the current stack and the given parameters. Marks
450 * __struct gl_contextRec::NewState with the dirty stack flag.
453 _mesa_Translatef( GLfloat x
, GLfloat y
, GLfloat z
)
455 GET_CURRENT_CONTEXT(ctx
);
456 ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx
);
457 _math_matrix_translate( ctx
->CurrentStack
->Top
, x
, y
, z
);
458 ctx
->NewState
|= ctx
->CurrentStack
->DirtyFlag
;
464 _mesa_LoadMatrixd( const GLdouble
*m
)
469 for (i
= 0; i
< 16; i
++)
470 f
[i
] = (GLfloat
) m
[i
];
471 _mesa_LoadMatrixf(f
);
475 _mesa_MultMatrixd( const GLdouble
*m
)
480 for (i
= 0; i
< 16; i
++)
481 f
[i
] = (GLfloat
) m
[i
];
482 _mesa_MultMatrixf( f
);
487 _mesa_Rotated( GLdouble angle
, GLdouble x
, GLdouble y
, GLdouble z
)
489 _mesa_Rotatef((GLfloat
) angle
, (GLfloat
) x
, (GLfloat
) y
, (GLfloat
) z
);
494 _mesa_Scaled( GLdouble x
, GLdouble y
, GLdouble z
)
496 _mesa_Scalef((GLfloat
) x
, (GLfloat
) y
, (GLfloat
) z
);
501 _mesa_Translated( GLdouble x
, GLdouble y
, GLdouble z
)
503 _mesa_Translatef((GLfloat
) x
, (GLfloat
) y
, (GLfloat
) z
);
510 _mesa_LoadTransposeMatrixfARB( const GLfloat
*m
)
514 _math_transposef(tm
, m
);
515 _mesa_LoadMatrixf(tm
);
520 _mesa_LoadTransposeMatrixdARB( const GLdouble
*m
)
524 _math_transposefd(tm
, m
);
525 _mesa_LoadMatrixf(tm
);
530 _mesa_MultTransposeMatrixfARB( const GLfloat
*m
)
534 _math_transposef(tm
, m
);
535 _mesa_MultMatrixf(tm
);
540 _mesa_MultTransposeMatrixdARB( const GLdouble
*m
)
544 _math_transposefd(tm
, m
);
545 _mesa_MultMatrixf(tm
);
551 /**********************************************************************/
552 /** \name State management */
557 * Update the projection matrix stack.
559 * \param ctx GL context.
561 * Calls _math_matrix_analyse() with the top-matrix of the projection matrix
562 * stack, and recomputes user clip positions if necessary.
564 * \note This routine references __struct gl_contextRec::Tranform attribute
565 * values to compute userclip positions in clip space, but is only called on
566 * _NEW_PROJECTION. The _mesa_ClipPlane() function keeps these values up to
567 * date across changes to the __struct gl_contextRec::Transform attributes.
570 update_projection( struct gl_context
*ctx
)
572 _math_matrix_analyse( ctx
->ProjectionMatrixStack
.Top
);
575 /* Recompute clip plane positions in clipspace. This is also done
576 * in _mesa_ClipPlane().
578 if (ctx
->Transform
.ClipPlanesEnabled
) {
580 for (p
= 0; p
< ctx
->Const
.MaxClipPlanes
; p
++) {
581 if (ctx
->Transform
.ClipPlanesEnabled
& (1 << p
)) {
582 _mesa_transform_vector( ctx
->Transform
._ClipUserPlane
[p
],
583 ctx
->Transform
.EyeUserPlane
[p
],
584 ctx
->ProjectionMatrixStack
.Top
->inv
);
593 * Calculate the combined modelview-projection matrix.
595 * \param ctx GL context.
597 * Multiplies the top matrices of the projection and model view stacks into
598 * __struct gl_contextRec::_ModelProjectMatrix via _math_matrix_mul_matrix()
599 * and analyzes the resulting matrix via _math_matrix_analyse().
602 calculate_model_project_matrix( struct gl_context
*ctx
)
604 _math_matrix_mul_matrix( &ctx
->_ModelProjectMatrix
,
605 ctx
->ProjectionMatrixStack
.Top
,
606 ctx
->ModelviewMatrixStack
.Top
);
608 _math_matrix_analyse( &ctx
->_ModelProjectMatrix
);
613 * Updates the combined modelview-projection matrix.
615 * \param ctx GL context.
616 * \param new_state new state bit mask.
618 * If there is a new model view matrix then analyzes it. If there is a new
619 * projection matrix, updates it. Finally calls
620 * calculate_model_project_matrix() to recalculate the modelview-projection
623 void _mesa_update_modelview_project( struct gl_context
*ctx
, GLuint new_state
)
625 if (new_state
& _NEW_MODELVIEW
) {
626 _math_matrix_analyse( ctx
->ModelviewMatrixStack
.Top
);
628 /* Bring cull position up to date.
630 TRANSFORM_POINT3( ctx
->Transform
.CullObjPos
,
631 ctx
->ModelviewMatrixStack
.Top
->inv
,
632 ctx
->Transform
.CullEyePos
);
636 if (new_state
& _NEW_PROJECTION
)
637 update_projection( ctx
);
639 /* Keep ModelviewProject up to date always to allow tnl
640 * implementations that go model->clip even when eye is required.
642 calculate_model_project_matrix(ctx
);
648 /**********************************************************************/
649 /** Matrix stack initialization */
654 * Initialize a matrix stack.
656 * \param stack matrix stack.
657 * \param maxDepth maximum stack depth.
658 * \param dirtyFlag dirty flag.
660 * Allocates an array of \p maxDepth elements for the matrix stack and calls
661 * _math_matrix_ctr() and _math_matrix_alloc_inv() for each element to
665 init_matrix_stack( struct gl_matrix_stack
*stack
,
666 GLuint maxDepth
, GLuint dirtyFlag
)
671 stack
->MaxDepth
= maxDepth
;
672 stack
->DirtyFlag
= dirtyFlag
;
674 stack
->Stack
= (GLmatrix
*) CALLOC(maxDepth
* sizeof(GLmatrix
));
675 for (i
= 0; i
< maxDepth
; i
++) {
676 _math_matrix_ctr(&stack
->Stack
[i
]);
677 _math_matrix_alloc_inv(&stack
->Stack
[i
]);
679 stack
->Top
= stack
->Stack
;
685 * \param stack matrix stack.
687 * Calls _math_matrix_dtr() for each element of the matrix stack and
691 free_matrix_stack( struct gl_matrix_stack
*stack
)
694 for (i
= 0; i
< stack
->MaxDepth
; i
++) {
695 _math_matrix_dtr(&stack
->Stack
[i
]);
698 stack
->Stack
= stack
->Top
= NULL
;
704 /**********************************************************************/
705 /** \name Initialization */
710 * Initialize the context matrix data.
712 * \param ctx GL context.
714 * Initializes each of the matrix stacks and the combined modelview-projection
717 void _mesa_init_matrix( struct gl_context
* ctx
)
721 /* Initialize matrix stacks */
722 init_matrix_stack(&ctx
->ModelviewMatrixStack
, MAX_MODELVIEW_STACK_DEPTH
,
724 init_matrix_stack(&ctx
->ProjectionMatrixStack
, MAX_PROJECTION_STACK_DEPTH
,
726 for (i
= 0; i
< Elements(ctx
->TextureMatrixStack
); i
++)
727 init_matrix_stack(&ctx
->TextureMatrixStack
[i
], MAX_TEXTURE_STACK_DEPTH
,
728 _NEW_TEXTURE_MATRIX
);
729 for (i
= 0; i
< Elements(ctx
->ProgramMatrixStack
); i
++)
730 init_matrix_stack(&ctx
->ProgramMatrixStack
[i
],
731 MAX_PROGRAM_MATRIX_STACK_DEPTH
, _NEW_TRACK_MATRIX
);
732 ctx
->CurrentStack
= &ctx
->ModelviewMatrixStack
;
734 /* Init combined Modelview*Projection matrix */
735 _math_matrix_ctr( &ctx
->_ModelProjectMatrix
);
740 * Free the context matrix data.
742 * \param ctx GL context.
744 * Frees each of the matrix stacks and the combined modelview-projection
747 void _mesa_free_matrix_data( struct gl_context
*ctx
)
751 free_matrix_stack(&ctx
->ModelviewMatrixStack
);
752 free_matrix_stack(&ctx
->ProjectionMatrixStack
);
753 for (i
= 0; i
< Elements(ctx
->TextureMatrixStack
); i
++)
754 free_matrix_stack(&ctx
->TextureMatrixStack
[i
]);
755 for (i
= 0; i
< Elements(ctx
->ProgramMatrixStack
); i
++)
756 free_matrix_stack(&ctx
->ProgramMatrixStack
[i
]);
757 /* combined Modelview*Projection matrix */
758 _math_matrix_dtr( &ctx
->_ModelProjectMatrix
);
764 * Initialize the context transform attribute group.
766 * \param ctx GL context.
768 * \todo Move this to a new file with other 'transform' routines.
770 void _mesa_init_transform( struct gl_context
*ctx
)
774 /* Transformation group */
775 ctx
->Transform
.MatrixMode
= GL_MODELVIEW
;
776 ctx
->Transform
.Normalize
= GL_FALSE
;
777 ctx
->Transform
.RescaleNormals
= GL_FALSE
;
778 ctx
->Transform
.RasterPositionUnclipped
= GL_FALSE
;
779 for (i
=0;i
<ctx
->Const
.MaxClipPlanes
;i
++) {
780 ASSIGN_4V( ctx
->Transform
.EyeUserPlane
[i
], 0.0, 0.0, 0.0, 0.0 );
782 ctx
->Transform
.ClipPlanesEnabled
= 0;
784 ASSIGN_4V( ctx
->Transform
.CullObjPos
, 0.0, 0.0, 1.0, 0.0 );
785 ASSIGN_4V( ctx
->Transform
.CullEyePos
, 0.0, 0.0, 1.0, 0.0 );