2 Copyright (C) Intel Corp. 2006. All Rights Reserved.
3 Intel funded Tungsten Graphics to
4 develop this 3D driver.
6 Permission is hereby granted, free of charge, to any person obtaining
7 a copy of this software and associated documentation files (the
8 "Software"), to deal in the Software without restriction, including
9 without limitation the rights to use, copy, modify, merge, publish,
10 distribute, sublicense, and/or sell copies of the Software, and to
11 permit persons to whom the Software is furnished to do so, subject to
12 the following conditions:
14 The above copyright notice and this permission notice (including the
15 next paragraph) shall be included in all copies or substantial
16 portions of the Software.
18 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
19 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
20 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
21 IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
22 LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
23 OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
24 WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
26 **********************************************************************/
29 * Keith Whitwell <keithw@vmware.com>
36 #include "brw_context.h"
39 /* Initial 3 verts, plus at most 6 additional verts from intersections
40 * with fixed planes, plus at most 8 additional verts from intersections
41 * with user clip planes
43 #define MAX_VERTS (3+6+8)
45 /* Note that if unfilled primitives are being emitted, we have to fix
46 * up polygon offset and flatshading at this point:
48 struct brw_clip_prog_key
{
50 struct interpolation_mode_map interpolation_mode
;
55 GLuint fill_cw
:2; /* includes cull information */
56 GLuint fill_ccw
:2; /* includes cull information */
60 GLuint copy_bfc_ccw
:1;
63 GLfloat offset_factor
;
75 #define PRIM_MASK (0x1f)
77 struct brw_clip_compile
{
78 struct brw_codegen func
;
79 struct brw_clip_prog_key key
;
80 struct brw_clip_prog_data prog_data
;
84 struct brw_reg vertex
[MAX_VERTS
];
87 struct brw_reg t0
, t1
;
88 struct brw_reg dp0
, dp1
;
90 struct brw_reg dpPrev
;
92 struct brw_reg loopcount
;
93 struct brw_reg nr_verts
;
94 struct brw_reg planemask
;
96 struct brw_reg inlist
;
97 struct brw_reg outlist
;
98 struct brw_reg freelist
;
101 struct brw_reg tmp0
, tmp1
;
102 struct brw_reg offset
;
104 struct brw_reg fixed_planes
;
105 struct brw_reg plane_equation
;
107 struct brw_reg ff_sync
;
109 /* Bitmask indicating which coordinate attribute should be used for
110 * comparison to each clipping plane. A 0 indicates that VARYING_SLOT_POS
111 * should be used, because it's one of the fixed +/- x/y/z planes that
112 * constitute the bounds of the view volume. A 1 indicates that
113 * VARYING_SLOT_CLIP_VERTEX should be used (if available) since it's a user-
114 * defined clipping plane.
116 struct brw_reg vertex_src_mask
;
118 /* Offset into the vertex of the current plane's clipdistance value */
119 struct brw_reg clipdistance_offset
;
122 /* Number of registers storing VUE data */
130 struct brw_vue_map vue_map
;
132 bool has_flat_shading
;
133 bool has_noperspective_shading
;
137 * True if the given varying is one of the outputs of the vertex shader.
139 static inline bool brw_clip_have_varying(struct brw_clip_compile
*c
,
142 return (c
->key
.attrs
& BITFIELD64_BIT(varying
)) ? 1 : 0;
145 /* Points are only culled, so no need for a clip routine, however it
146 * works out easier to have a dummy one.
148 void brw_emit_unfilled_clip( struct brw_clip_compile
*c
);
149 void brw_emit_tri_clip( struct brw_clip_compile
*c
);
150 void brw_emit_line_clip( struct brw_clip_compile
*c
);
151 void brw_emit_point_clip( struct brw_clip_compile
*c
);
153 /* brw_clip_tri.c, for use by the unfilled clip routine:
155 void brw_clip_tri_init_vertices( struct brw_clip_compile
*c
);
156 void brw_clip_tri_flat_shade( struct brw_clip_compile
*c
);
157 void brw_clip_tri( struct brw_clip_compile
*c
);
158 void brw_clip_tri_emit_polygon( struct brw_clip_compile
*c
);
159 void brw_clip_tri_alloc_regs( struct brw_clip_compile
*c
,
166 void brw_clip_interp_vertex( struct brw_clip_compile
*c
,
167 struct brw_indirect dest_ptr
,
168 struct brw_indirect v0_ptr
, /* from */
169 struct brw_indirect v1_ptr
, /* to */
171 bool force_edgeflag
);
173 void brw_clip_init_planes( struct brw_clip_compile
*c
);
175 void brw_clip_emit_vue(struct brw_clip_compile
*c
,
176 struct brw_indirect vert
,
177 enum brw_urb_write_flags flags
,
180 void brw_clip_kill_thread(struct brw_clip_compile
*c
);
182 struct brw_reg
brw_clip_plane_stride( struct brw_clip_compile
*c
);
183 struct brw_reg
brw_clip_plane0_address( struct brw_clip_compile
*c
);
185 void brw_clip_copy_flatshaded_attributes( struct brw_clip_compile
*c
,
186 GLuint to
, GLuint from
);
188 void brw_clip_init_clipmask( struct brw_clip_compile
*c
);
190 struct brw_reg
get_tmp( struct brw_clip_compile
*c
);
192 void brw_clip_project_position(struct brw_clip_compile
*c
,
193 struct brw_reg pos
);
194 void brw_clip_ff_sync(struct brw_clip_compile
*c
);
195 void brw_clip_init_ff_sync(struct brw_clip_compile
*c
);