6 * -# 4x4 transformation matrices are stored in memory in column major order.
7 * -# Points/vertices are to be thought of as column vectors.
8 * -# Transformation of a point p by a matrix M is: p' = M * p
12 * Mesa 3-D graphics library
15 * Copyright (C) 1999-2004 Brian Paul All Rights Reserved.
17 * Permission is hereby granted, free of charge, to any person obtaining a
18 * copy of this software and associated documentation files (the "Software"),
19 * to deal in the Software without restriction, including without limitation
20 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
21 * and/or sell copies of the Software, and to permit persons to whom the
22 * Software is furnished to do so, subject to the following conditions:
24 * The above copyright notice and this permission notice shall be included
25 * in all copies or substantial portions of the Software.
27 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
28 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
29 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
30 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
31 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
32 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
44 #include "math/m_matrix.h"
45 #include "math/m_xform.h"
49 * Apply a perspective projection matrix.
51 * \param left left clipping plane coordinate.
52 * \param right right clipping plane coordinate.
53 * \param bottom bottom clipping plane coordinate.
54 * \param top top clipping plane coordinate.
55 * \param nearval distance to the near clipping plane.
56 * \param farval distance to the far clipping plane.
60 * Flushes vertices and validates parameters. Calls _math_matrix_frustum() with
61 * the top matrix of the current matrix stack and sets
62 * __GLcontextRec::NewState.
65 _mesa_Frustum( GLdouble left
, GLdouble right
,
66 GLdouble bottom
, GLdouble top
,
67 GLdouble nearval
, GLdouble farval
)
69 GET_CURRENT_CONTEXT(ctx
);
70 ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx
);
78 _mesa_error( ctx
, GL_INVALID_VALUE
, "glFrustum" );
82 _math_matrix_frustum( ctx
->CurrentStack
->Top
,
83 (GLfloat
) left
, (GLfloat
) right
,
84 (GLfloat
) bottom
, (GLfloat
) top
,
85 (GLfloat
) nearval
, (GLfloat
) farval
);
86 ctx
->NewState
|= ctx
->CurrentStack
->DirtyFlag
;
91 * Apply an orthographic projection matrix.
93 * \param left left clipping plane coordinate.
94 * \param right right clipping plane coordinate.
95 * \param bottom bottom clipping plane coordinate.
96 * \param top top clipping plane coordinate.
97 * \param nearval distance to the near clipping plane.
98 * \param farval distance to the far clipping plane.
102 * Flushes vertices and validates parameters. Calls _math_matrix_ortho() with
103 * the top matrix of the current matrix stack and sets
104 * __GLcontextRec::NewState.
107 _mesa_Ortho( GLdouble left
, GLdouble right
,
108 GLdouble bottom
, GLdouble top
,
109 GLdouble nearval
, GLdouble farval
)
111 GET_CURRENT_CONTEXT(ctx
);
112 ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx
);
114 if (MESA_VERBOSE
& VERBOSE_API
)
115 _mesa_debug(ctx
, "glOrtho(%f, %f, %f, %f, %f, %f)\n",
116 left
, right
, bottom
, top
, nearval
, farval
);
122 _mesa_error( ctx
, GL_INVALID_VALUE
, "glOrtho" );
126 _math_matrix_ortho( ctx
->CurrentStack
->Top
,
127 (GLfloat
) left
, (GLfloat
) right
,
128 (GLfloat
) bottom
, (GLfloat
) top
,
129 (GLfloat
) nearval
, (GLfloat
) farval
);
130 ctx
->NewState
|= ctx
->CurrentStack
->DirtyFlag
;
135 * Set the current matrix stack.
137 * \param mode matrix stack.
139 * \sa glMatrixMode().
141 * Flushes the vertices, validates the parameter and updates
142 * __GLcontextRec::CurrentStack and gl_transform_attrib::MatrixMode with the
143 * specified matrix stack.
146 _mesa_MatrixMode( GLenum mode
)
148 GET_CURRENT_CONTEXT(ctx
);
149 ASSERT_OUTSIDE_BEGIN_END(ctx
);
151 if (ctx
->Transform
.MatrixMode
== mode
&& mode
!= GL_TEXTURE
)
153 FLUSH_VERTICES(ctx
, _NEW_TRANSFORM
);
157 ctx
->CurrentStack
= &ctx
->ModelviewMatrixStack
;
160 ctx
->CurrentStack
= &ctx
->ProjectionMatrixStack
;
163 ctx
->CurrentStack
= &ctx
->TextureMatrixStack
[ctx
->Texture
.CurrentUnit
];
166 ctx
->CurrentStack
= &ctx
->ColorMatrixStack
;
176 if (ctx
->Extensions
.NV_vertex_program
) {
177 ctx
->CurrentStack
= &ctx
->ProgramMatrixStack
[mode
- GL_MATRIX0_NV
];
180 _mesa_error( ctx
, GL_INVALID_ENUM
, "glMatrixMode(mode)" );
192 if (ctx
->Extensions
.ARB_vertex_program
||
193 ctx
->Extensions
.ARB_fragment_program
) {
194 const GLuint m
= mode
- GL_MATRIX0_ARB
;
195 if (m
> ctx
->Const
.MaxProgramMatrices
) {
196 _mesa_error(ctx
, GL_INVALID_ENUM
,
197 "glMatrixMode(GL_MATRIX%d_ARB)", m
);
200 ctx
->CurrentStack
= &ctx
->ProgramMatrixStack
[m
];
203 _mesa_error( ctx
, GL_INVALID_ENUM
, "glMatrixMode(mode)" );
208 _mesa_error( ctx
, GL_INVALID_ENUM
, "glMatrixMode(mode)" );
212 ctx
->Transform
.MatrixMode
= mode
;
217 * Push the current matrix stack.
219 * \sa glPushMatrix().
221 * Verifies the current matrix stack is not full, and duplicates the top-most
222 * matrix in the stack. Marks __GLcontextRec::NewState with the stack dirty
226 _mesa_PushMatrix( void )
228 GET_CURRENT_CONTEXT(ctx
);
229 struct matrix_stack
*stack
= ctx
->CurrentStack
;
230 ASSERT_OUTSIDE_BEGIN_END(ctx
);
232 if (MESA_VERBOSE
&VERBOSE_API
)
233 _mesa_debug(ctx
, "glPushMatrix %s\n",
234 _mesa_lookup_enum_by_nr(ctx
->Transform
.MatrixMode
));
236 if (stack
->Depth
+ 1 >= stack
->MaxDepth
) {
237 if (ctx
->Transform
.MatrixMode
== GL_TEXTURE
) {
238 _mesa_error(ctx
, GL_STACK_OVERFLOW
,
239 "glPushMatrix(mode=GL_TEXTURE, unit=%d)",
240 ctx
->Texture
.CurrentUnit
);
243 _mesa_error(ctx
, GL_STACK_OVERFLOW
, "glPushMatrix(mode=%s)",
244 _mesa_lookup_enum_by_nr(ctx
->Transform
.MatrixMode
));
248 _math_matrix_copy( &stack
->Stack
[stack
->Depth
+ 1],
249 &stack
->Stack
[stack
->Depth
] );
251 stack
->Top
= &(stack
->Stack
[stack
->Depth
]);
252 ctx
->NewState
|= stack
->DirtyFlag
;
257 * Pop the current matrix stack.
261 * Flushes the vertices, verifies the current matrix stack is not empty, and
262 * moves the stack head down. Marks __GLcontextRec::NewState with the dirty
266 _mesa_PopMatrix( void )
268 GET_CURRENT_CONTEXT(ctx
);
269 struct matrix_stack
*stack
= ctx
->CurrentStack
;
270 ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx
);
272 if (MESA_VERBOSE
&VERBOSE_API
)
273 _mesa_debug(ctx
, "glPopMatrix %s\n",
274 _mesa_lookup_enum_by_nr(ctx
->Transform
.MatrixMode
));
276 if (stack
->Depth
== 0) {
277 if (ctx
->Transform
.MatrixMode
== GL_TEXTURE
) {
278 _mesa_error(ctx
, GL_STACK_UNDERFLOW
,
279 "glPopMatrix(mode=GL_TEXTURE, unit=%d)",
280 ctx
->Texture
.CurrentUnit
);
283 _mesa_error(ctx
, GL_STACK_UNDERFLOW
, "glPopMatrix(mode=%s)",
284 _mesa_lookup_enum_by_nr(ctx
->Transform
.MatrixMode
));
289 stack
->Top
= &(stack
->Stack
[stack
->Depth
]);
290 ctx
->NewState
|= stack
->DirtyFlag
;
295 * Replace the current matrix with the identity matrix.
297 * \sa glLoadIdentity().
299 * Flushes the vertices and calls _math_matrix_set_identity() with the top-most
300 * matrix in the current stack. Marks __GLcontextRec::NewState with the stack
304 _mesa_LoadIdentity( void )
306 GET_CURRENT_CONTEXT(ctx
);
307 ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx
);
309 if (MESA_VERBOSE
& VERBOSE_API
)
310 _mesa_debug(ctx
, "glLoadIdentity()");
312 _math_matrix_set_identity( ctx
->CurrentStack
->Top
);
313 ctx
->NewState
|= ctx
->CurrentStack
->DirtyFlag
;
318 * Replace the current matrix with a given matrix.
322 * \sa glLoadMatrixf().
324 * Flushes the vertices and calls _math_matrix_loadf() with the top-most matrix
325 * in the current stack and the given matrix. Marks __GLcontextRec::NewState
326 * with the dirty stack flag.
329 _mesa_LoadMatrixf( const GLfloat
*m
)
331 GET_CURRENT_CONTEXT(ctx
);
333 if (MESA_VERBOSE
& VERBOSE_API
)
335 "glLoadMatrix(%f %f %f %f, %f %f %f %f, %f %f %f %f, %f %f %f %f\n",
336 m
[0], m
[4], m
[8], m
[12],
337 m
[1], m
[5], m
[9], m
[13],
338 m
[2], m
[6], m
[10], m
[14],
339 m
[3], m
[7], m
[11], m
[15]);
341 ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx
);
342 _math_matrix_loadf( ctx
->CurrentStack
->Top
, m
);
343 ctx
->NewState
|= ctx
->CurrentStack
->DirtyFlag
;
348 * Multiply the current matrix with a given matrix.
352 * \sa glMultMatrixf().
354 * Flushes the vertices and calls _math_matrix_mul_floats() with the top-most
355 * matrix in the current stack and the given matrix. Marks
356 * __GLcontextRec::NewState with the dirty stack flag.
359 _mesa_MultMatrixf( const GLfloat
*m
)
361 GET_CURRENT_CONTEXT(ctx
);
363 if (MESA_VERBOSE
& VERBOSE_API
)
365 "glMultMatrix(%f %f %f %f, %f %f %f %f, %f %f %f %f, %f %f %f %f\n",
366 m
[0], m
[4], m
[8], m
[12],
367 m
[1], m
[5], m
[9], m
[13],
368 m
[2], m
[6], m
[10], m
[14],
369 m
[3], m
[7], m
[11], m
[15]);
370 ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx
);
371 _math_matrix_mul_floats( ctx
->CurrentStack
->Top
, m
);
372 ctx
->NewState
|= ctx
->CurrentStack
->DirtyFlag
;
377 * Multiply the current matrix with a rotation matrix.
379 * \param angle angle of rotation, in degrees.
380 * \param x rotation vector x coordinate.
381 * \param y rotation vector y coordinate.
382 * \param z rotation vector z coordinate.
386 * Flushes the vertices and calls _math_matrix_rotate() with the top-most
387 * matrix in the current stack and the given parameters. Marks
388 * __GLcontextRec::NewState with the dirty stack flag.
391 _mesa_Rotatef( GLfloat angle
, GLfloat x
, GLfloat y
, GLfloat z
)
393 GET_CURRENT_CONTEXT(ctx
);
394 ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx
);
396 _math_matrix_rotate( ctx
->CurrentStack
->Top
, angle
, x
, y
, z
);
397 ctx
->NewState
|= ctx
->CurrentStack
->DirtyFlag
;
403 * Multiply the current matrix with a general scaling matrix.
405 * \param x x axis scale factor.
406 * \param y y axis scale factor.
407 * \param z z axis scale factor.
411 * Flushes the vertices and calls _math_matrix_scale() with the top-most
412 * matrix in the current stack and the given parameters. Marks
413 * __GLcontextRec::NewState with the dirty stack flag.
416 _mesa_Scalef( GLfloat x
, GLfloat y
, GLfloat z
)
418 GET_CURRENT_CONTEXT(ctx
);
419 ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx
);
420 _math_matrix_scale( ctx
->CurrentStack
->Top
, x
, y
, z
);
421 ctx
->NewState
|= ctx
->CurrentStack
->DirtyFlag
;
426 * Multiply the current matrix with a general scaling matrix.
428 * \param x translation vector x coordinate.
429 * \param y translation vector y coordinate.
430 * \param z translation vector z coordinate.
432 * \sa glTranslatef().
434 * Flushes the vertices and calls _math_matrix_translate() with the top-most
435 * matrix in the current stack and the given parameters. Marks
436 * __GLcontextRec::NewState with the dirty stack flag.
439 _mesa_Translatef( GLfloat x
, GLfloat y
, GLfloat z
)
441 GET_CURRENT_CONTEXT(ctx
);
442 ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx
);
443 _math_matrix_translate( ctx
->CurrentStack
->Top
, x
, y
, z
);
444 ctx
->NewState
|= ctx
->CurrentStack
->DirtyFlag
;
450 _mesa_LoadMatrixd( const GLdouble
*m
)
455 for (i
= 0; i
< 16; i
++)
456 f
[i
] = (GLfloat
) m
[i
];
457 _mesa_LoadMatrixf(f
);
461 _mesa_MultMatrixd( const GLdouble
*m
)
466 for (i
= 0; i
< 16; i
++)
467 f
[i
] = (GLfloat
) m
[i
];
468 _mesa_MultMatrixf( f
);
473 _mesa_Rotated( GLdouble angle
, GLdouble x
, GLdouble y
, GLdouble z
)
475 _mesa_Rotatef((GLfloat
) angle
, (GLfloat
) x
, (GLfloat
) y
, (GLfloat
) z
);
480 _mesa_Scaled( GLdouble x
, GLdouble y
, GLdouble z
)
482 _mesa_Scalef((GLfloat
) x
, (GLfloat
) y
, (GLfloat
) z
);
487 _mesa_Translated( GLdouble x
, GLdouble y
, GLdouble z
)
489 _mesa_Translatef((GLfloat
) x
, (GLfloat
) y
, (GLfloat
) z
);
496 _mesa_LoadTransposeMatrixfARB( const GLfloat
*m
)
500 _math_transposef(tm
, m
);
501 _mesa_LoadMatrixf(tm
);
506 _mesa_LoadTransposeMatrixdARB( const GLdouble
*m
)
510 _math_transposefd(tm
, m
);
511 _mesa_LoadMatrixf(tm
);
516 _mesa_MultTransposeMatrixfARB( const GLfloat
*m
)
520 _math_transposef(tm
, m
);
521 _mesa_MultMatrixf(tm
);
526 _mesa_MultTransposeMatrixdARB( const GLdouble
*m
)
530 _math_transposefd(tm
, m
);
531 _mesa_MultMatrixf(tm
);
538 * \param x, y coordinates of the lower-left corner of the viewport rectangle.
539 * \param width width of the viewport rectangle.
540 * \param height height of the viewport rectangle.
542 * \sa Called via glViewport() or display list execution.
544 * Flushes the vertices and calls _mesa_set_viewport() with the given
548 _mesa_Viewport( GLint x
, GLint y
, GLsizei width
, GLsizei height
)
550 GET_CURRENT_CONTEXT(ctx
);
551 ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx
);
552 _mesa_set_viewport(ctx
, x
, y
, width
, height
);
556 * Set new viewport parameters and update derived state (the _WindowMap
557 * matrix). Usually called from _mesa_Viewport().
559 * \note We also call _mesa_ResizeBuffersMESA() because this is a good
560 * time to check if the window has been resized. Many device drivers
561 * can't get direct notification from the window system of size changes
562 * so this is an ad-hoc solution to that problem.
564 * \param ctx GL context.
565 * \param x, y coordinates of the lower left corner of the viewport rectangle.
566 * \param width width of the viewport rectangle.
567 * \param height height of the viewport rectangle.
569 * Verifies the parameters, clamps them to the implementation dependent range
570 * and updates __GLcontextRec::Viewport. Computes the scale and bias values for
571 * the drivers and notifies the driver via the dd_function_table::Viewport
575 _mesa_set_viewport( GLcontext
*ctx
, GLint x
, GLint y
,
576 GLsizei width
, GLsizei height
)
578 const GLfloat n
= ctx
->Viewport
.Near
;
579 const GLfloat f
= ctx
->Viewport
.Far
;
581 if (MESA_VERBOSE
& VERBOSE_API
)
582 _mesa_debug(ctx
, "glViewport %d %d %d %d\n", x
, y
, width
, height
);
584 if (width
< 0 || height
< 0) {
585 _mesa_error( ctx
, GL_INVALID_VALUE
,
586 "glViewport(%d, %d, %d, %d)", x
, y
, width
, height
);
590 /* clamp width, and height to implementation dependent range */
591 width
= CLAMP( width
, 1, MAX_WIDTH
);
592 height
= CLAMP( height
, 1, MAX_HEIGHT
);
596 ctx
->Viewport
.Width
= width
;
598 ctx
->Viewport
.Height
= height
;
600 /* XXX send transposed width/height to Driver.Viewport() below??? */
601 if (ctx
->_RotateMode
) {
603 tmp
= x
; x
= y
; y
= tmp
;
604 tmps
= width
; width
= height
; height
= tmps
;
607 /* compute scale and bias values :: This is really driver-specific
608 * and should be maintained elsewhere if at all. NOTE: RasterPos
611 ctx
->Viewport
._WindowMap
.m
[MAT_SX
] = (GLfloat
) width
/ 2.0F
;
612 ctx
->Viewport
._WindowMap
.m
[MAT_TX
] = ctx
->Viewport
._WindowMap
.m
[MAT_SX
] + x
;
613 ctx
->Viewport
._WindowMap
.m
[MAT_SY
] = (GLfloat
) height
/ 2.0F
;
614 ctx
->Viewport
._WindowMap
.m
[MAT_TY
] = ctx
->Viewport
._WindowMap
.m
[MAT_SY
] + y
;
615 ctx
->Viewport
._WindowMap
.m
[MAT_SZ
] = ctx
->DepthMaxF
* ((f
- n
) / 2.0F
);
616 ctx
->Viewport
._WindowMap
.m
[MAT_TZ
] = ctx
->DepthMaxF
* ((f
- n
) / 2.0F
+ n
);
617 ctx
->Viewport
._WindowMap
.flags
= MAT_FLAG_GENERAL_SCALE
|MAT_FLAG_TRANSLATION
;
618 ctx
->Viewport
._WindowMap
.type
= MATRIX_3D_NO_ROT
;
619 ctx
->NewState
|= _NEW_VIEWPORT
;
621 /* Check if window/buffer has been resized and if so, reallocate the
622 * ancillary buffers. This is an ad-hoc solution to detecting window
623 * size changes. 99% of all GL apps call glViewport when a window is
624 * resized so this is a good time to check for new window dims and
625 * reallocate color buffers and ancilliary buffers.
627 _mesa_ResizeBuffersMESA();
629 if (ctx
->Driver
.Viewport
) {
630 (*ctx
->Driver
.Viewport
)( ctx
, x
, y
, width
, height
);
637 _mesa_DepthRange( GLclampd nearval
, GLclampd farval
)
640 * nearval - specifies mapping of the near clipping plane to window
641 * coordinates, default is 0
642 * farval - specifies mapping of the far clipping plane to window
643 * coordinates, default is 1
645 * After clipping and div by w, z coords are in -1.0 to 1.0,
646 * corresponding to near and far clipping planes. glDepthRange
647 * specifies a linear mapping of the normalized z coords in
648 * this range to window z coords.
651 GET_CURRENT_CONTEXT(ctx
);
652 ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx
);
654 if (MESA_VERBOSE
&VERBOSE_API
)
655 _mesa_debug(ctx
, "glDepthRange %f %f\n", nearval
, farval
);
657 n
= (GLfloat
) CLAMP( nearval
, 0.0, 1.0 );
658 f
= (GLfloat
) CLAMP( farval
, 0.0, 1.0 );
660 ctx
->Viewport
.Near
= n
;
661 ctx
->Viewport
.Far
= f
;
662 ctx
->Viewport
._WindowMap
.m
[MAT_SZ
] = ctx
->DepthMaxF
* ((f
- n
) / 2.0F
);
663 ctx
->Viewport
._WindowMap
.m
[MAT_TZ
] = ctx
->DepthMaxF
* ((f
- n
) / 2.0F
+ n
);
664 ctx
->NewState
|= _NEW_VIEWPORT
;
666 if (ctx
->Driver
.DepthRange
) {
667 (*ctx
->Driver
.DepthRange
)( ctx
, nearval
, farval
);
674 /**********************************************************************/
675 /** \name State management */
680 * Update the projection matrix stack.
682 * \param ctx GL context.
684 * Calls _math_matrix_analyse() with the top-matrix of the projection matrix
685 * stack, and recomputes user clip positions if necessary.
687 * \note This routine references __GLcontextRec::Tranform attribute values to
688 * compute userclip positions in clip space, but is only called on
689 * _NEW_PROJECTION. The _mesa_ClipPlane() function keeps these values up to
690 * date across changes to the __GLcontextRec::Transform attributes.
693 update_projection( GLcontext
*ctx
)
695 _math_matrix_analyse( ctx
->ProjectionMatrixStack
.Top
);
698 /* Recompute clip plane positions in clipspace. This is also done
699 * in _mesa_ClipPlane().
701 if (ctx
->Transform
.ClipPlanesEnabled
) {
703 for (p
= 0; p
< ctx
->Const
.MaxClipPlanes
; p
++) {
704 if (ctx
->Transform
.ClipPlanesEnabled
& (1 << p
)) {
705 _mesa_transform_vector( ctx
->Transform
._ClipUserPlane
[p
],
706 ctx
->Transform
.EyeUserPlane
[p
],
707 ctx
->ProjectionMatrixStack
.Top
->inv
);
716 * Calculate the combined modelview-projection matrix.
718 * \param ctx GL context.
720 * Multiplies the top matrices of the projection and model view stacks into
721 * __GLcontextRec::_ModelProjectMatrix via _math_matrix_mul_matrix() and
722 * analyzes the resulting matrix via _math_matrix_analyse().
725 calculate_model_project_matrix( GLcontext
*ctx
)
727 _math_matrix_mul_matrix( &ctx
->_ModelProjectMatrix
,
728 ctx
->ProjectionMatrixStack
.Top
,
729 ctx
->ModelviewMatrixStack
.Top
);
731 _math_matrix_analyse( &ctx
->_ModelProjectMatrix
);
736 * Updates the combined modelview-projection matrix.
738 * \param ctx GL context.
739 * \param new_state new state bit mask.
741 * If there is a new model view matrix then analyzes it. If there is a new
742 * projection matrix, updates it. Finally calls
743 * calculate_model_project_matrix() to recalculate the modelview-projection
746 void _mesa_update_modelview_project( GLcontext
*ctx
, GLuint new_state
)
748 if (new_state
& _NEW_MODELVIEW
) {
749 _math_matrix_analyse( ctx
->ModelviewMatrixStack
.Top
);
751 /* Bring cull position uptodate.
753 TRANSFORM_POINT3( ctx
->Transform
.CullObjPos
,
754 ctx
->ModelviewMatrixStack
.Top
->inv
,
755 ctx
->Transform
.CullEyePos
);
759 if (new_state
& _NEW_PROJECTION
)
760 update_projection( ctx
);
762 /* Keep ModelviewProject uptodate always to allow tnl
763 * implementations that go model->clip even when eye is required.
765 calculate_model_project_matrix(ctx
);
771 /**********************************************************************/
772 /** Matrix stack initialization */
777 * Initialize a matrix stack.
779 * \param stack matrix stack.
780 * \param maxDepth maximum stack depth.
781 * \param dirtyFlag dirty flag.
783 * Allocates an array of \p maxDepth elements for the matrix stack and calls
784 * _math_matrix_ctr() and _math_matrix_alloc_inv() for each element to
788 init_matrix_stack( struct matrix_stack
*stack
,
789 GLuint maxDepth
, GLuint dirtyFlag
)
794 stack
->MaxDepth
= maxDepth
;
795 stack
->DirtyFlag
= dirtyFlag
;
797 stack
->Stack
= (GLmatrix
*) CALLOC(maxDepth
* sizeof(GLmatrix
));
798 for (i
= 0; i
< maxDepth
; i
++) {
799 _math_matrix_ctr(&stack
->Stack
[i
]);
800 _math_matrix_alloc_inv(&stack
->Stack
[i
]);
802 stack
->Top
= stack
->Stack
;
808 * \param stack matrix stack.
810 * Calls _math_matrix_dtr() for each element of the matrix stack and
814 free_matrix_stack( struct matrix_stack
*stack
)
817 for (i
= 0; i
< stack
->MaxDepth
; i
++) {
818 _math_matrix_dtr(&stack
->Stack
[i
]);
821 stack
->Stack
= stack
->Top
= NULL
;
827 /**********************************************************************/
828 /** \name Initialization */
833 * Initialize the context matrix data.
835 * \param ctx GL context.
837 * Initializes each of the matrix stacks and the combined modelview-projection
840 void _mesa_init_matrix( GLcontext
* ctx
)
844 /* Initialize matrix stacks */
845 init_matrix_stack(&ctx
->ModelviewMatrixStack
, MAX_MODELVIEW_STACK_DEPTH
,
847 init_matrix_stack(&ctx
->ProjectionMatrixStack
, MAX_PROJECTION_STACK_DEPTH
,
849 init_matrix_stack(&ctx
->ColorMatrixStack
, MAX_COLOR_STACK_DEPTH
,
851 for (i
= 0; i
< MAX_TEXTURE_UNITS
; i
++)
852 init_matrix_stack(&ctx
->TextureMatrixStack
[i
], MAX_TEXTURE_STACK_DEPTH
,
853 _NEW_TEXTURE_MATRIX
);
854 for (i
= 0; i
< MAX_PROGRAM_MATRICES
; i
++)
855 init_matrix_stack(&ctx
->ProgramMatrixStack
[i
],
856 MAX_PROGRAM_MATRIX_STACK_DEPTH
, _NEW_TRACK_MATRIX
);
857 ctx
->CurrentStack
= &ctx
->ModelviewMatrixStack
;
859 /* Init combined Modelview*Projection matrix */
860 _math_matrix_ctr( &ctx
->_ModelProjectMatrix
);
865 * Free the context matrix data.
867 * \param ctx GL context.
869 * Frees each of the matrix stacks and the combined modelview-projection
872 void _mesa_free_matrix_data( GLcontext
*ctx
)
876 free_matrix_stack(&ctx
->ModelviewMatrixStack
);
877 free_matrix_stack(&ctx
->ProjectionMatrixStack
);
878 free_matrix_stack(&ctx
->ColorMatrixStack
);
879 for (i
= 0; i
< MAX_TEXTURE_UNITS
; i
++)
880 free_matrix_stack(&ctx
->TextureMatrixStack
[i
]);
881 for (i
= 0; i
< MAX_PROGRAM_MATRICES
; i
++)
882 free_matrix_stack(&ctx
->ProgramMatrixStack
[i
]);
883 /* combined Modelview*Projection matrix */
884 _math_matrix_dtr( &ctx
->_ModelProjectMatrix
);
890 * Initialize the context transform attribute group.
892 * \param ctx GL context.
894 * \todo Move this to a new file with other 'transform' routines.
896 void _mesa_init_transform( GLcontext
*ctx
)
900 /* Transformation group */
901 ctx
->Transform
.MatrixMode
= GL_MODELVIEW
;
902 ctx
->Transform
.Normalize
= GL_FALSE
;
903 ctx
->Transform
.RescaleNormals
= GL_FALSE
;
904 ctx
->Transform
.RasterPositionUnclipped
= GL_FALSE
;
905 for (i
=0;i
<MAX_CLIP_PLANES
;i
++) {
906 ASSIGN_4V( ctx
->Transform
.EyeUserPlane
[i
], 0.0, 0.0, 0.0, 0.0 );
908 ctx
->Transform
.ClipPlanesEnabled
= 0;
910 ASSIGN_4V( ctx
->Transform
.CullObjPos
, 0.0, 0.0, 1.0, 0.0 );
911 ASSIGN_4V( ctx
->Transform
.CullEyePos
, 0.0, 0.0, 1.0, 0.0 );
916 * Initialize the context viewport attribute group.
918 * \param ctx GL context.
920 * \todo Move this to a new file with other 'viewport' routines.
922 void _mesa_init_viewport( GLcontext
*ctx
)
927 ctx
->Viewport
.Width
= 0;
928 ctx
->Viewport
.Height
= 0;
929 ctx
->Viewport
.Near
= 0.0;
930 ctx
->Viewport
.Far
= 1.0;
931 _math_matrix_ctr(&ctx
->Viewport
._WindowMap
);
935 ctx
->Viewport
._WindowMap
.m
[Sz
] = 0.5F
* ctx
->DepthMaxF
;
936 ctx
->Viewport
._WindowMap
.m
[Tz
] = 0.5F
* ctx
->DepthMaxF
;
940 ctx
->Viewport
._WindowMap
.flags
= MAT_FLAG_GENERAL_SCALE
|MAT_FLAG_TRANSLATION
;
941 ctx
->Viewport
._WindowMap
.type
= MATRIX_3D_NO_ROT
;
946 * Free the context viewport attribute group data.
948 * \param ctx GL context.
950 * \todo Move this to a new file with other 'viewport' routines.
952 void _mesa_free_viewport_data( GLcontext
*ctx
)
954 _math_matrix_dtr(&ctx
->Viewport
._WindowMap
);