3 * Mesa 3-D graphics library
6 * Copyright (C) 1999-2003 Brian Paul 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.
26 * Keith Whitwell <keith@tungstengraphics.com>
37 #include "math/m_xform.h"
39 #include "t_context.h"
40 #include "t_pipeline.h"
44 struct normal_stage_data
{
45 normal_func NormalTransform
;
49 #define NORMAL_STAGE_DATA(stage) ((struct normal_stage_data *)stage->privatePtr)
54 static GLboolean
run_normal_stage( GLcontext
*ctx
,
55 struct gl_pipeline_stage
*stage
)
57 struct normal_stage_data
*store
= NORMAL_STAGE_DATA(stage
);
58 struct vertex_buffer
*VB
= &TNL_CONTEXT(ctx
)->vb
;
60 ASSERT(store
->NormalTransform
);
62 if (stage
->changed_inputs
) {
63 /* We can only use the display list's saved normal lengths if we've
64 * got a transformation matrix with uniform scaling.
66 const GLfloat
*lengths
;
67 if (ctx
->ModelviewMatrixStack
.Top
->flags
& MAT_FLAG_GENERAL_SCALE
)
70 lengths
= VB
->NormalLengthPtr
;
72 store
->NormalTransform( ctx
->ModelviewMatrixStack
.Top
,
73 ctx
->_ModelViewInvScale
,
74 VB
->NormalPtr
, /* input normals */
76 &store
->normal
); /* resulting normals */
79 VB
->NormalPtr
= &store
->normal
;
80 VB
->NormalLengthPtr
= 0; /* no longer valid */
85 static GLboolean
run_validate_normal_stage( GLcontext
*ctx
,
86 struct gl_pipeline_stage
*stage
)
88 struct normal_stage_data
*store
= NORMAL_STAGE_DATA(stage
);
90 ASSERT(ctx
->_NeedNormals
);
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 gl_pipeline_stage
*stage
)
139 stage
->active
= ctx
->_NeedNormals
&& !ctx
->VertexProgram
.Enabled
;
140 /* Don't clobber the initialize function:
142 if (stage
->privatePtr
)
143 stage
->run
= run_validate_normal_stage
;
147 static GLboolean
alloc_normal_data( GLcontext
*ctx
,
148 struct gl_pipeline_stage
*stage
)
150 TNLcontext
*tnl
= TNL_CONTEXT(ctx
);
151 struct normal_stage_data
*store
;
152 stage
->privatePtr
= MALLOC(sizeof(*store
));
153 store
= NORMAL_STAGE_DATA(stage
);
157 _mesa_vector4f_alloc( &store
->normal
, 0, tnl
->vb
.Size
, 32 );
159 /* Now run the stage.
161 stage
->run
= run_validate_normal_stage
;
162 return stage
->run( ctx
, stage
);
167 static void free_normal_data( struct gl_pipeline_stage
*stage
)
169 struct normal_stage_data
*store
= NORMAL_STAGE_DATA(stage
);
171 _mesa_vector4f_free( &store
->normal
);
173 stage
->privatePtr
= NULL
;
177 #define _TNL_NEW_NORMAL_TRANSFORM (_NEW_MODELVIEW| \
179 _MESA_NEW_NEED_NORMALS| \
180 _MESA_NEW_NEED_EYE_COORDS)
184 const struct gl_pipeline_stage _tnl_normal_transform_stage
=
186 "normal transform", /* name */
187 _TNL_NEW_NORMAL_TRANSFORM
, /* re-check */
188 _TNL_NEW_NORMAL_TRANSFORM
, /* re-run */
189 GL_FALSE
, /* active? */
190 VERT_BIT_NORMAL
, /* inputs */
191 VERT_BIT_NORMAL
, /* outputs */
192 0, /* changed_inputs */
193 NULL
, /* private data */
194 free_normal_data
, /* destructor */
195 check_normal_transform
, /* check */
196 alloc_normal_data
/* run -- initially set to alloc */