2 * Mesa 3-D graphics library
5 * Copyright (C) 1999-2004 Brian Paul All Rights Reserved.
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:
14 * The above copyright notice and this permission notice shall be included
15 * in all copies or substantial portions of the Software.
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.
25 * Keith Whitwell <keith@tungstengraphics.com>
36 #include "math/m_xform.h"
38 #include "t_context.h"
39 #include "t_pipeline.h"
43 struct normal_stage_data
{
44 normal_func NormalTransform
;
48 #define NORMAL_STAGE_DATA(stage) ((struct normal_stage_data *)stage->privatePtr)
53 static GLboolean
run_normal_stage( GLcontext
*ctx
,
54 struct tnl_pipeline_stage
*stage
)
56 struct normal_stage_data
*store
= NORMAL_STAGE_DATA(stage
);
57 struct vertex_buffer
*VB
= &TNL_CONTEXT(ctx
)->vb
;
59 ASSERT(store
->NormalTransform
);
61 if (stage
->changed_inputs
) {
62 /* We can only use the display list's saved normal lengths if we've
63 * got a transformation matrix with uniform scaling.
65 const GLfloat
*lengths
;
66 if (ctx
->ModelviewMatrixStack
.Top
->flags
& MAT_FLAG_GENERAL_SCALE
)
69 lengths
= VB
->NormalLengthPtr
;
71 store
->NormalTransform( ctx
->ModelviewMatrixStack
.Top
,
72 ctx
->_ModelViewInvScale
,
73 VB
->NormalPtr
, /* input normals */
75 &store
->normal
); /* resulting normals */
78 VB
->NormalPtr
= &store
->normal
;
79 VB
->AttribPtr
[_TNL_ATTRIB_NORMAL
] = VB
->NormalPtr
;
81 VB
->NormalLengthPtr
= 0; /* no longer valid */
86 static GLboolean
run_validate_normal_stage( GLcontext
*ctx
,
87 struct tnl_pipeline_stage
*stage
)
89 struct normal_stage_data
*store
= NORMAL_STAGE_DATA(stage
);
92 if (ctx
->_NeedEyeCoords
) {
93 GLuint transform
= NORM_TRANSFORM_NO_ROT
;
95 if (ctx
->ModelviewMatrixStack
.Top
->flags
& (MAT_FLAG_GENERAL
|
98 MAT_FLAG_PERSPECTIVE
))
99 transform
= NORM_TRANSFORM
;
102 if (ctx
->Transform
.Normalize
) {
103 store
->NormalTransform
= _mesa_normal_tab
[transform
| NORM_NORMALIZE
];
105 else if (ctx
->Transform
.RescaleNormals
&&
106 ctx
->_ModelViewInvScale
!= 1.0) {
107 store
->NormalTransform
= _mesa_normal_tab
[transform
| NORM_RESCALE
];
110 store
->NormalTransform
= _mesa_normal_tab
[transform
];
114 if (ctx
->Transform
.Normalize
) {
115 store
->NormalTransform
= _mesa_normal_tab
[NORM_NORMALIZE
];
117 else if (!ctx
->Transform
.RescaleNormals
&&
118 ctx
->_ModelViewInvScale
!= 1.0) {
119 store
->NormalTransform
= _mesa_normal_tab
[NORM_RESCALE
];
122 store
->NormalTransform
= 0;
126 if (store
->NormalTransform
) {
127 stage
->run
= run_normal_stage
;
128 return stage
->run( ctx
, stage
);
130 stage
->active
= GL_FALSE
; /* !!! */
136 static void check_normal_transform( GLcontext
*ctx
,
137 struct tnl_pipeline_stage
*stage
)
139 stage
->active
= !ctx
->VertexProgram
._Enabled
&&
140 (ctx
->Light
.Enabled
|| (ctx
->Texture
._GenFlags
& TEXGEN_NEED_NORMALS
));
142 /* Don't clobber the initialize function:
144 if (stage
->privatePtr
)
145 stage
->run
= run_validate_normal_stage
;
149 static GLboolean
alloc_normal_data( GLcontext
*ctx
,
150 struct tnl_pipeline_stage
*stage
)
152 TNLcontext
*tnl
= TNL_CONTEXT(ctx
);
153 struct normal_stage_data
*store
;
154 stage
->privatePtr
= MALLOC(sizeof(*store
));
155 store
= NORMAL_STAGE_DATA(stage
);
159 _mesa_vector4f_alloc( &store
->normal
, 0, tnl
->vb
.Size
, 32 );
161 /* Now run the stage.
163 stage
->run
= run_validate_normal_stage
;
164 return stage
->run( ctx
, stage
);
169 static void free_normal_data( struct tnl_pipeline_stage
*stage
)
171 struct normal_stage_data
*store
= NORMAL_STAGE_DATA(stage
);
173 _mesa_vector4f_free( &store
->normal
);
175 stage
->privatePtr
= NULL
;
179 #define _TNL_NEW_NORMAL_TRANSFORM (_NEW_MODELVIEW| \
182 _MESA_NEW_NEED_NORMALS| \
183 _MESA_NEW_NEED_EYE_COORDS)
187 const struct tnl_pipeline_stage _tnl_normal_transform_stage
=
189 "normal transform", /* name */
190 _TNL_NEW_NORMAL_TRANSFORM
, /* re-check */
191 _TNL_NEW_NORMAL_TRANSFORM
, /* re-run */
192 GL_FALSE
, /* active? */
193 _TNL_BIT_NORMAL
, /* inputs */
194 _TNL_BIT_NORMAL
, /* outputs */
195 0, /* changed_inputs */
196 NULL
, /* private data */
197 free_normal_data
, /* destructor */
198 check_normal_transform
, /* check */
199 alloc_normal_data
/* run -- initially set to alloc */