2 * Mesa 3-D graphics library
4 * Copyright (C) 1999-2006 Brian Paul All Rights Reserved.
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the "Software"),
8 * to deal in the Software without restriction, including without limitation
9 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10 * and/or sell copies of the Software, and to permit persons to whom the
11 * Software is furnished to do so, subject to the following conditions:
13 * The above copyright notice and this permission notice shall be included
14 * in all copies or substantial portions of the Software.
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
17 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
20 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
21 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
22 * OTHER DEALINGS IN THE SOFTWARE.
25 * Keith Whitwell <keithw@vmware.com>
29 #include "main/glheader.h"
30 #include "main/macros.h"
31 #include "main/imports.h"
32 #include "main/mtypes.h"
34 #include "math/m_xform.h"
36 #include "util/bitscan.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( struct gl_context *ctx, \
65 GLubyte *clipormask, \
66 GLubyte *clipandmask ) \
68 GLbitfield mask = ctx->Transform.ClipPlanesEnabled; \
70 const int p = u_bit_scan(&mask); \
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 tnl_clip_prepare(struct gl_context
*ctx
)
123 /* Neither the x86 nor sparc asm cliptest functions have been updated
124 * for ARB_depth_clamp, so force the C paths.
126 if (ctx
->Transform
.DepthClamp
) {
127 static GLboolean c_funcs_installed
= GL_FALSE
;
128 if (!c_funcs_installed
) {
130 c_funcs_installed
= GL_TRUE
;
137 static GLboolean
run_vertex_stage( struct gl_context
*ctx
,
138 struct tnl_pipeline_stage
*stage
)
140 struct vertex_stage_data
*store
= (struct vertex_stage_data
*)stage
->privatePtr
;
141 TNLcontext
*tnl
= TNL_CONTEXT(ctx
);
142 struct vertex_buffer
*VB
= &tnl
->vb
;
144 if (ctx
->VertexProgram
._Current
)
147 tnl_clip_prepare(ctx
);
149 if (ctx
->_NeedEyeCoords
) {
150 /* Separate modelview transformation:
151 * Use combined ModelProject to avoid some depth artifacts
153 if (ctx
->ModelviewMatrixStack
.Top
->type
== MATRIX_IDENTITY
)
154 VB
->EyePtr
= VB
->AttribPtr
[_TNL_ATTRIB_POS
];
156 VB
->EyePtr
= TransformRaw( &store
->eye
,
157 ctx
->ModelviewMatrixStack
.Top
,
158 VB
->AttribPtr
[_TNL_ATTRIB_POS
]);
161 VB
->ClipPtr
= TransformRaw( &store
->clip
,
162 &ctx
->_ModelProjectMatrix
,
163 VB
->AttribPtr
[_TNL_ATTRIB_POS
] );
165 /* Drivers expect this to be clean to element 4...
167 switch (VB
->ClipPtr
->size
) {
171 _mesa_vector4f_clean_elem( VB
->ClipPtr
, VB
->Count
, 2 );
174 _mesa_vector4f_clean_elem( VB
->ClipPtr
, VB
->Count
, 3 );
181 /* Cliptest and perspective divide. Clip functions must clear
185 store
->andmask
= CLIP_FRUSTUM_BITS
;
187 if (tnl
->NeedNdcCoords
) {
189 _mesa_clip_tab
[VB
->ClipPtr
->size
]( VB
->ClipPtr
,
194 !ctx
->Transform
.DepthClamp
);
198 _mesa_clip_np_tab
[VB
->ClipPtr
->size
]( VB
->ClipPtr
,
203 !ctx
->Transform
.DepthClamp
);
210 /* Test userclip planes. This contributes to VB->ClipMask, so
211 * is essentially required to be in this stage.
213 if (ctx
->Transform
.ClipPlanesEnabled
) {
214 usercliptab
[VB
->ClipPtr
->size
]( ctx
,
224 VB
->ClipAndMask
= store
->andmask
;
225 VB
->ClipOrMask
= store
->ormask
;
226 VB
->ClipMask
= store
->clipmask
;
232 static GLboolean
init_vertex_stage( struct gl_context
*ctx
,
233 struct tnl_pipeline_stage
*stage
)
235 struct vertex_buffer
*VB
= &TNL_CONTEXT(ctx
)->vb
;
236 struct vertex_stage_data
*store
;
237 GLuint size
= VB
->Size
;
239 stage
->privatePtr
= calloc(1, sizeof(*store
));
240 store
= VERTEX_STAGE_DATA(stage
);
244 _mesa_vector4f_alloc( &store
->eye
, 0, size
, 32 );
245 _mesa_vector4f_alloc( &store
->clip
, 0, size
, 32 );
246 _mesa_vector4f_alloc( &store
->proj
, 0, size
, 32 );
248 store
->clipmask
= _mesa_align_malloc(sizeof(GLubyte
)*size
, 32 );
250 if (!store
->clipmask
||
259 static void dtr( struct tnl_pipeline_stage
*stage
)
261 struct vertex_stage_data
*store
= VERTEX_STAGE_DATA(stage
);
264 _mesa_vector4f_free( &store
->eye
);
265 _mesa_vector4f_free( &store
->clip
);
266 _mesa_vector4f_free( &store
->proj
);
267 _mesa_align_free( store
->clipmask
);
269 stage
->privatePtr
= NULL
;
270 stage
->run
= init_vertex_stage
;
275 const struct tnl_pipeline_stage _tnl_vertex_transform_stage
=
277 "modelview/project/cliptest/divide",
278 NULL
, /* private data */
280 dtr
, /* destructor */
282 run_vertex_stage
/* run -- initially set to init */