2 * Mesa 3-D graphics library
5 * Copyright (C) 1999-2006 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>
29 #include "main/glheader.h"
30 #include "main/colormac.h"
31 #include "main/macros.h"
32 #include "main/imports.h"
33 #include "main/mtypes.h"
35 #include "math/m_xform.h"
37 #include "t_context.h"
38 #include "t_pipeline.h"
42 struct vertex_stage_data
{
51 #define VERTEX_STAGE_DATA(stage) ((struct vertex_stage_data *)stage->privatePtr)
56 /* This function implements cliptesting for user-defined clip planes.
57 * The clipping of primitives to these planes is implemented in
60 #define USER_CLIPTEST(NAME, SZ) \
61 static void NAME( struct gl_context *ctx, \
64 GLubyte *clipormask, \
65 GLubyte *clipandmask ) \
69 for (p = 0; p < ctx->Const.MaxClipPlanes; p++) \
70 if (ctx->Transform.ClipPlanesEnabled & (1 << p)) { \
72 const GLfloat a = ctx->Transform._ClipUserPlane[p][0]; \
73 const GLfloat b = ctx->Transform._ClipUserPlane[p][1]; \
74 const GLfloat c = ctx->Transform._ClipUserPlane[p][2]; \
75 const GLfloat d = ctx->Transform._ClipUserPlane[p][3]; \
76 GLfloat *coord = (GLfloat *)clip->data; \
77 GLuint stride = clip->stride; \
78 GLuint count = clip->count; \
80 for (nr = 0, i = 0 ; i < count ; i++) { \
81 GLfloat dp = coord[0] * a + coord[1] * b; \
82 if (SZ > 2) dp += coord[2] * c; \
83 if (SZ > 3) dp += coord[3] * d; else dp += d; \
87 clipmask[i] |= CLIP_USER_BIT; \
90 STRIDE_F(coord, stride); \
94 *clipormask |= CLIP_USER_BIT; \
96 *clipandmask |= CLIP_USER_BIT; \
104 USER_CLIPTEST(userclip2
, 2)
105 USER_CLIPTEST(userclip3
, 3)
106 USER_CLIPTEST(userclip4
, 4)
108 static void (*(usercliptab
[5]))( struct gl_context
*,
109 GLvector4f
*, GLubyte
*,
110 GLubyte
*, GLubyte
* ) =
121 static GLboolean
run_vertex_stage( struct gl_context
*ctx
,
122 struct tnl_pipeline_stage
*stage
)
124 struct vertex_stage_data
*store
= (struct vertex_stage_data
*)stage
->privatePtr
;
125 TNLcontext
*tnl
= TNL_CONTEXT(ctx
);
126 struct vertex_buffer
*VB
= &tnl
->vb
;
128 if (ctx
->_NeedEyeCoords
) {
129 /* Separate modelview transformation:
130 * Use combined ModelProject to avoid some depth artifacts
132 if (ctx
->ModelviewMatrixStack
.Top
->type
== MATRIX_IDENTITY
)
133 VB
->EyePtr
= VB
->AttribPtr
[_TNL_ATTRIB_POS
];
135 VB
->EyePtr
= TransformRaw( &store
->eye
,
136 ctx
->ModelviewMatrixStack
.Top
,
137 VB
->AttribPtr
[_TNL_ATTRIB_POS
]);
140 VB
->ClipPtr
= TransformRaw( &store
->clip
,
141 &ctx
->_ModelProjectMatrix
,
142 VB
->AttribPtr
[_TNL_ATTRIB_POS
] );
144 /* Drivers expect this to be clean to element 4...
146 switch (VB
->ClipPtr
->size
) {
150 _mesa_vector4f_clean_elem( VB
->ClipPtr
, VB
->Count
, 2 );
153 _mesa_vector4f_clean_elem( VB
->ClipPtr
, VB
->Count
, 3 );
160 /* Cliptest and perspective divide. Clip functions must clear
164 store
->andmask
= CLIP_FRUSTUM_BITS
;
166 if (tnl
->NeedNdcCoords
) {
168 _mesa_clip_tab
[VB
->ClipPtr
->size
]( VB
->ClipPtr
,
176 _mesa_clip_np_tab
[VB
->ClipPtr
->size
]( VB
->ClipPtr
,
187 /* Test userclip planes. This contributes to VB->ClipMask, so
188 * is essentially required to be in this stage.
190 if (ctx
->Transform
.ClipPlanesEnabled
) {
191 usercliptab
[VB
->ClipPtr
->size
]( ctx
,
201 VB
->ClipAndMask
= store
->andmask
;
202 VB
->ClipOrMask
= store
->ormask
;
203 VB
->ClipMask
= store
->clipmask
;
209 static GLboolean
init_vertex_stage( struct gl_context
*ctx
,
210 struct tnl_pipeline_stage
*stage
)
212 struct vertex_buffer
*VB
= &TNL_CONTEXT(ctx
)->vb
;
213 struct vertex_stage_data
*store
;
214 GLuint size
= VB
->Size
;
216 stage
->privatePtr
= CALLOC(sizeof(*store
));
217 store
= VERTEX_STAGE_DATA(stage
);
221 _mesa_vector4f_alloc( &store
->eye
, 0, size
, 32 );
222 _mesa_vector4f_alloc( &store
->clip
, 0, size
, 32 );
223 _mesa_vector4f_alloc( &store
->proj
, 0, size
, 32 );
225 store
->clipmask
= (GLubyte
*) _mesa_align_malloc(sizeof(GLubyte
)*size
, 32 );
227 if (!store
->clipmask
||
236 static void dtr( struct tnl_pipeline_stage
*stage
)
238 struct vertex_stage_data
*store
= VERTEX_STAGE_DATA(stage
);
241 _mesa_vector4f_free( &store
->eye
);
242 _mesa_vector4f_free( &store
->clip
);
243 _mesa_vector4f_free( &store
->proj
);
244 _mesa_align_free( store
->clipmask
);
246 stage
->privatePtr
= NULL
;
247 stage
->run
= init_vertex_stage
;
252 const struct tnl_pipeline_stage _tnl_vertex_transform_stage
=
254 "modelview/project/cliptest/divide",
255 NULL
, /* private data */
257 dtr
, /* destructor */
259 run_vertex_stage
/* run -- initially set to init */