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>
36 #include "math/m_xform.h"
38 #include "t_context.h"
39 #include "t_pipeline.h"
43 struct vertex_stage_data
{
52 #define VERTEX_STAGE_DATA(stage) ((struct vertex_stage_data *)stage->privatePtr)
57 /* This function implements cliptesting for user-defined clip planes.
58 * The clipping of primitives to these planes is implemented in
61 #define USER_CLIPTEST(NAME, SZ) \
62 static void NAME( GLcontext *ctx, \
65 GLubyte *clipormask, \
66 GLubyte *clipandmask ) \
70 for (p = 0; p < ctx->Const.MaxClipPlanes; p++) \
71 if (ctx->Transform.ClipPlanesEnabled & (1 << p)) { \
73 const GLfloat a = ctx->Transform._ClipUserPlane[p][0]; \
74 const GLfloat b = ctx->Transform._ClipUserPlane[p][1]; \
75 const GLfloat c = ctx->Transform._ClipUserPlane[p][2]; \
76 const GLfloat d = ctx->Transform._ClipUserPlane[p][3]; \
77 GLfloat *coord = (GLfloat *)clip->data; \
78 GLuint stride = clip->stride; \
79 GLuint count = clip->count; \
81 for (nr = 0, i = 0 ; i < count ; i++) { \
82 GLfloat dp = coord[0] * a + coord[1] * b; \
83 if (SZ > 2) dp += coord[2] * c; \
84 if (SZ > 3) dp += coord[3] * d; else dp += d; \
88 clipmask[i] |= CLIP_USER_BIT; \
91 STRIDE_F(coord, stride); \
95 *clipormask |= CLIP_USER_BIT; \
97 *clipandmask |= CLIP_USER_BIT; \
105 USER_CLIPTEST(userclip2
, 2)
106 USER_CLIPTEST(userclip3
, 3)
107 USER_CLIPTEST(userclip4
, 4)
109 static void (*(usercliptab
[5]))( GLcontext
*,
110 GLvector4f
*, GLubyte
*,
111 GLubyte
*, GLubyte
* ) =
122 static GLboolean
run_vertex_stage( GLcontext
*ctx
,
123 struct tnl_pipeline_stage
*stage
)
125 struct vertex_stage_data
*store
= (struct vertex_stage_data
*)stage
->privatePtr
;
126 TNLcontext
*tnl
= TNL_CONTEXT(ctx
);
127 struct vertex_buffer
*VB
= &tnl
->vb
;
129 if (ctx
->ShaderObjects
._VertexShaderPresent
)
132 if (ctx
->VertexProgram
._Enabled
)
135 if (ctx
->_NeedEyeCoords
) {
136 /* Separate modelview transformation:
137 * Use combined ModelProject to avoid some depth artifacts
139 if (ctx
->ModelviewMatrixStack
.Top
->type
== MATRIX_IDENTITY
)
140 VB
->EyePtr
= VB
->ObjPtr
;
142 VB
->EyePtr
= TransformRaw( &store
->eye
,
143 ctx
->ModelviewMatrixStack
.Top
,
147 VB
->ClipPtr
= TransformRaw( &store
->clip
,
148 &ctx
->_ModelProjectMatrix
,
151 /* Drivers expect this to be clean to element 4...
153 switch (VB
->ClipPtr
->size
) {
157 _mesa_vector4f_clean_elem( VB
->ClipPtr
, VB
->Count
, 2 );
160 _mesa_vector4f_clean_elem( VB
->ClipPtr
, VB
->Count
, 3 );
167 /* Cliptest and perspective divide. Clip functions must clear
171 store
->andmask
= CLIP_FRUSTUM_BITS
;
173 if (tnl
->NeedNdcCoords
) {
175 _mesa_clip_tab
[VB
->ClipPtr
->size
]( VB
->ClipPtr
,
183 _mesa_clip_np_tab
[VB
->ClipPtr
->size
]( VB
->ClipPtr
,
194 /* Test userclip planes. This contributes to VB->ClipMask, so
195 * is essentially required to be in this stage.
197 if (ctx
->Transform
.ClipPlanesEnabled
) {
198 usercliptab
[VB
->ClipPtr
->size
]( ctx
,
208 VB
->ClipAndMask
= store
->andmask
;
209 VB
->ClipOrMask
= store
->ormask
;
210 VB
->ClipMask
= store
->clipmask
;
216 static GLboolean
init_vertex_stage( GLcontext
*ctx
,
217 struct tnl_pipeline_stage
*stage
)
219 struct vertex_buffer
*VB
= &TNL_CONTEXT(ctx
)->vb
;
220 struct vertex_stage_data
*store
;
221 GLuint size
= VB
->Size
;
223 stage
->privatePtr
= CALLOC(sizeof(*store
));
224 store
= VERTEX_STAGE_DATA(stage
);
228 _mesa_vector4f_alloc( &store
->eye
, 0, size
, 32 );
229 _mesa_vector4f_alloc( &store
->clip
, 0, size
, 32 );
230 _mesa_vector4f_alloc( &store
->proj
, 0, size
, 32 );
232 store
->clipmask
= (GLubyte
*) ALIGN_MALLOC(sizeof(GLubyte
)*size
, 32 );
234 if (!store
->clipmask
||
243 static void dtr( struct tnl_pipeline_stage
*stage
)
245 struct vertex_stage_data
*store
= VERTEX_STAGE_DATA(stage
);
248 _mesa_vector4f_free( &store
->eye
);
249 _mesa_vector4f_free( &store
->clip
);
250 _mesa_vector4f_free( &store
->proj
);
251 ALIGN_FREE( store
->clipmask
);
253 stage
->privatePtr
= NULL
;
254 stage
->run
= init_vertex_stage
;
259 const struct tnl_pipeline_stage _tnl_vertex_transform_stage
=
261 "modelview/project/cliptest/divide",
262 NULL
, /* private data */
264 dtr
, /* destructor */
266 run_vertex_stage
/* run -- initially set to init */