3 * Mesa 3-D graphics library
6 * Copyright (C) 1999-2001 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 vertex_stage_data
{
53 /* Need these because it's difficult to replay the sideeffects
56 GLvector4f
*save_eyeptr
;
57 GLvector4f
*save_clipptr
;
58 GLvector4f
*save_ndcptr
;
61 #define VERTEX_STAGE_DATA(stage) ((struct vertex_stage_data *)stage->privatePtr)
66 /* This function implements cliptesting for user-defined clip planes.
67 * The clipping of primitives to these planes is implemented in
70 #define USER_CLIPTEST(NAME, SZ) \
71 static void NAME( GLcontext *ctx, \
74 GLubyte *clipormask, \
75 GLubyte *clipandmask ) \
79 for (p = 0; p < ctx->Const.MaxClipPlanes; p++) \
80 if (ctx->Transform.ClipPlanesEnabled & (1 << p)) { \
82 const GLfloat a = ctx->Transform._ClipUserPlane[p][0]; \
83 const GLfloat b = ctx->Transform._ClipUserPlane[p][1]; \
84 const GLfloat c = ctx->Transform._ClipUserPlane[p][2]; \
85 const GLfloat d = ctx->Transform._ClipUserPlane[p][3]; \
86 GLfloat *coord = (GLfloat *)clip->data; \
87 GLuint stride = clip->stride; \
88 GLuint count = clip->count; \
90 for (nr = 0, i = 0 ; i < count ; i++) { \
91 GLfloat dp = coord[0] * a + coord[1] * b; \
92 if (SZ > 2) dp += coord[2] * c; \
93 if (SZ > 3) dp += coord[3] * d; else dp += d; \
97 clipmask[i] |= CLIP_USER_BIT; \
100 STRIDE_F(coord, stride); \
104 *clipormask |= CLIP_USER_BIT; \
106 *clipandmask |= CLIP_USER_BIT; \
114 USER_CLIPTEST(userclip2
, 2)
115 USER_CLIPTEST(userclip3
, 3)
116 USER_CLIPTEST(userclip4
, 4)
118 static void (*(usercliptab
[5]))( GLcontext
*,
119 GLvector4f
*, GLubyte
*,
120 GLubyte
*, GLubyte
* ) =
131 static GLboolean
run_vertex_stage( GLcontext
*ctx
,
132 struct tnl_pipeline_stage
*stage
)
134 struct vertex_stage_data
*store
= (struct vertex_stage_data
*)stage
->privatePtr
;
135 TNLcontext
*tnl
= TNL_CONTEXT(ctx
);
136 struct vertex_buffer
*VB
= &tnl
->vb
;
138 ASSERT(!ctx
->VertexProgram
.Enabled
);
140 if (stage
->changed_inputs
) {
142 if (ctx
->_NeedEyeCoords
) {
143 /* Separate modelview transformation:
144 * Use combined ModelProject to avoid some depth artifacts
146 if (ctx
->ModelviewMatrixStack
.Top
->type
== MATRIX_IDENTITY
)
147 VB
->EyePtr
= VB
->ObjPtr
;
149 VB
->EyePtr
= TransformRaw( &store
->eye
,
150 ctx
->ModelviewMatrixStack
.Top
,
154 VB
->ClipPtr
= TransformRaw( &store
->clip
,
155 &ctx
->_ModelProjectMatrix
,
158 /* Drivers expect this to be clean to element 4...
160 switch (VB
->ClipPtr
->size
) {
164 _mesa_vector4f_clean_elem( VB
->ClipPtr
, VB
->Count
, 2 );
166 _mesa_vector4f_clean_elem( VB
->ClipPtr
, VB
->Count
, 3 );
171 /* Cliptest and perspective divide. Clip functions must clear
175 store
->andmask
= CLIP_ALL_BITS
;
177 if (tnl
->NeedNdcCoords
) {
179 _mesa_clip_tab
[VB
->ClipPtr
->size
]( VB
->ClipPtr
,
187 _mesa_clip_np_tab
[VB
->ClipPtr
->size
]( VB
->ClipPtr
,
198 /* Test userclip planes. This contributes to VB->ClipMask, so
199 * is essentially required to be in this stage.
201 if (ctx
->Transform
.ClipPlanesEnabled
) {
202 usercliptab
[VB
->ClipPtr
->size
]( ctx
,
212 VB
->ClipOrMask
= store
->ormask
;
213 VB
->ClipMask
= store
->clipmask
;
215 store
->save_eyeptr
= VB
->EyePtr
;
216 store
->save_clipptr
= VB
->ClipPtr
;
217 store
->save_ndcptr
= VB
->NdcPtr
;
220 /* Replay the sideeffects.
222 VB
->EyePtr
= store
->save_eyeptr
;
223 VB
->ClipPtr
= store
->save_clipptr
;
224 VB
->NdcPtr
= store
->save_ndcptr
;
225 VB
->ClipMask
= store
->clipmask
;
226 VB
->ClipOrMask
= store
->ormask
;
235 static void check_vertex( GLcontext
*ctx
, struct tnl_pipeline_stage
*stage
)
237 stage
->active
= !ctx
->VertexProgram
.Enabled
;
240 static GLboolean
init_vertex_stage( GLcontext
*ctx
,
241 struct tnl_pipeline_stage
*stage
)
243 struct vertex_buffer
*VB
= &TNL_CONTEXT(ctx
)->vb
;
244 struct vertex_stage_data
*store
;
245 GLuint size
= VB
->Size
;
247 stage
->privatePtr
= CALLOC(sizeof(*store
));
248 store
= VERTEX_STAGE_DATA(stage
);
252 _mesa_vector4f_alloc( &store
->eye
, 0, size
, 32 );
253 _mesa_vector4f_alloc( &store
->clip
, 0, size
, 32 );
254 _mesa_vector4f_alloc( &store
->proj
, 0, size
, 32 );
256 store
->clipmask
= (GLubyte
*) ALIGN_MALLOC(sizeof(GLubyte
)*size
, 32 );
258 if (!store
->clipmask
||
264 /* Now run the stage.
266 stage
->run
= run_vertex_stage
;
267 return stage
->run( ctx
, stage
);
270 static void dtr( struct tnl_pipeline_stage
*stage
)
272 struct vertex_stage_data
*store
= VERTEX_STAGE_DATA(stage
);
275 _mesa_vector4f_free( &store
->eye
);
276 _mesa_vector4f_free( &store
->clip
);
277 _mesa_vector4f_free( &store
->proj
);
278 ALIGN_FREE( store
->clipmask
);
280 stage
->privatePtr
= NULL
;
281 stage
->run
= init_vertex_stage
;
286 const struct tnl_pipeline_stage _tnl_vertex_transform_stage
=
288 "modelview/project/cliptest/divide",
289 _NEW_PROGRAM
, /* check_state: only care about vertex prog */
290 _MESA_NEW_NEED_EYE_COORDS
| /* run_state: when to invalidate / re-run */
295 GL_TRUE
, /* active */
296 _TNL_BIT_POS
, /* inputs */
297 _TNL_BIT_POS
, /* outputs */
298 0, /* changed_inputs */
299 NULL
, /* private data */
300 dtr
, /* destructor */
301 check_vertex
, /* check */
302 init_vertex_stage
/* run -- initially set to init */