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>
32 #include "main/glheader.h"
33 #include "main/macros.h"
34 #include "main/enums.h"
36 #include "intel_batchbuffer.h"
38 #include "brw_defines.h"
39 #include "brw_context.h"
42 #include "brw_state.h"
45 #include "util/ralloc.h"
47 #define FRONT_UNFILLED_BIT 0x1
48 #define BACK_UNFILLED_BIT 0x2
51 static void compile_clip_prog( struct brw_context
*brw
,
52 struct brw_clip_prog_key
*key
)
54 struct brw_clip_compile c
;
55 const GLuint
*program
;
59 memset(&c
, 0, sizeof(c
));
61 mem_ctx
= ralloc_context(NULL
);
63 /* Begin the compilation:
65 brw_init_compile(brw
, &c
.func
, mem_ctx
);
67 c
.func
.single_program_flow
= 1;
70 c
.vue_map
= brw
->vue_map_geom_out
;
73 brw_any_flat_varyings(&key
->interpolation_mode
);
74 c
.has_noperspective_shading
=
75 brw_any_noperspective_varyings(&key
->interpolation_mode
);
77 /* nr_regs is the number of registers filled by reading data from the VUE.
78 * This program accesses the entire VUE, so nr_regs needs to be the size of
79 * the VUE (measured in pairs, since two slots are stored in each
82 c
.nr_regs
= (c
.vue_map
.num_slots
+ 1)/2;
84 c
.prog_data
.clip_mode
= c
.key
.clip_mode
; /* XXX */
86 /* For some reason the thread is spawned with only 4 channels
89 brw_set_default_mask_control(&c
.func
, BRW_MASK_DISABLE
);
92 /* Would ideally have the option of producing a program which could
95 switch (key
->primitive
) {
98 brw_emit_unfilled_clip( &c
);
100 brw_emit_tri_clip( &c
);
103 brw_emit_line_clip( &c
);
106 brw_emit_point_clip( &c
);
109 unreachable("not reached");
112 brw_compact_instructions(&c
.func
, 0, 0, NULL
);
116 program
= brw_get_program(&c
.func
, &program_size
);
118 if (unlikely(INTEL_DEBUG
& DEBUG_CLIP
)) {
119 fprintf(stderr
, "clip:\n");
120 brw_disassemble(brw
, c
.func
.store
, 0, program_size
, stderr
);
121 fprintf(stderr
, "\n");
124 brw_upload_cache(&brw
->cache
,
126 &c
.key
, sizeof(c
.key
),
127 program
, program_size
,
128 &c
.prog_data
, sizeof(c
.prog_data
),
129 &brw
->clip
.prog_offset
, &brw
->clip
.prog_data
);
130 ralloc_free(mem_ctx
);
133 /* Calculate interpolants for triangle and line rasterization.
136 brw_upload_clip_prog(struct brw_context
*brw
)
138 struct gl_context
*ctx
= &brw
->ctx
;
139 struct brw_clip_prog_key key
;
141 memset(&key
, 0, sizeof(key
));
146 /* BRW_NEW_INTERPOLATION_MAP */
147 key
.interpolation_mode
= brw
->interpolation_mode
;
149 /* BRW_NEW_REDUCED_PRIMITIVE */
150 key
.primitive
= brw
->reduced_primitive
;
151 /* BRW_NEW_VUE_MAP_GEOM_OUT */
152 key
.attrs
= brw
->vue_map_geom_out
.slots_valid
;
155 key
.pv_first
= (ctx
->Light
.ProvokingVertex
== GL_FIRST_VERTEX_CONVENTION
);
156 /* _NEW_TRANSFORM (also part of VUE map)*/
157 if (ctx
->Transform
.ClipPlanesEnabled
)
158 key
.nr_userclip
= _mesa_logbase2(ctx
->Transform
.ClipPlanesEnabled
) + 1;
161 key
.clip_mode
= BRW_CLIPMODE_KERNEL_CLIP
;
163 key
.clip_mode
= BRW_CLIPMODE_NORMAL
;
166 if (key
.primitive
== GL_TRIANGLES
) {
167 if (ctx
->Polygon
.CullFlag
&&
168 ctx
->Polygon
.CullFaceMode
== GL_FRONT_AND_BACK
)
169 key
.clip_mode
= BRW_CLIPMODE_REJECT_ALL
;
171 GLuint fill_front
= CLIP_CULL
;
172 GLuint fill_back
= CLIP_CULL
;
173 GLuint offset_front
= 0;
174 GLuint offset_back
= 0;
176 if (!ctx
->Polygon
.CullFlag
||
177 ctx
->Polygon
.CullFaceMode
!= GL_FRONT
) {
178 switch (ctx
->Polygon
.FrontMode
) {
180 fill_front
= CLIP_FILL
;
184 fill_front
= CLIP_LINE
;
185 offset_front
= ctx
->Polygon
.OffsetLine
;
188 fill_front
= CLIP_POINT
;
189 offset_front
= ctx
->Polygon
.OffsetPoint
;
194 if (!ctx
->Polygon
.CullFlag
||
195 ctx
->Polygon
.CullFaceMode
!= GL_BACK
) {
196 switch (ctx
->Polygon
.BackMode
) {
198 fill_back
= CLIP_FILL
;
202 fill_back
= CLIP_LINE
;
203 offset_back
= ctx
->Polygon
.OffsetLine
;
206 fill_back
= CLIP_POINT
;
207 offset_back
= ctx
->Polygon
.OffsetPoint
;
212 if (ctx
->Polygon
.BackMode
!= GL_FILL
||
213 ctx
->Polygon
.FrontMode
!= GL_FILL
) {
216 /* Most cases the fixed function units will handle. Cases where
217 * one or more polygon faces are unfilled will require help:
219 key
.clip_mode
= BRW_CLIPMODE_CLIP_NON_REJECTED
;
221 if (offset_back
|| offset_front
) {
222 /* _NEW_POLYGON, _NEW_BUFFERS */
223 key
.offset_units
= ctx
->Polygon
.OffsetUnits
* ctx
->DrawBuffer
->_MRD
* 2;
224 key
.offset_factor
= ctx
->Polygon
.OffsetFactor
* ctx
->DrawBuffer
->_MRD
;
227 if (!ctx
->Polygon
._FrontBit
) {
228 key
.fill_ccw
= fill_front
;
229 key
.fill_cw
= fill_back
;
230 key
.offset_ccw
= offset_front
;
231 key
.offset_cw
= offset_back
;
232 if (ctx
->Light
.Model
.TwoSide
&&
233 key
.fill_cw
!= CLIP_CULL
)
236 key
.fill_cw
= fill_front
;
237 key
.fill_ccw
= fill_back
;
238 key
.offset_cw
= offset_front
;
239 key
.offset_ccw
= offset_back
;
240 if (ctx
->Light
.Model
.TwoSide
&&
241 key
.fill_ccw
!= CLIP_CULL
)
242 key
.copy_bfc_ccw
= 1;
248 if (!brw_search_cache(&brw
->cache
, BRW_CACHE_CLIP_PROG
,
250 &brw
->clip
.prog_offset
, &brw
->clip
.prog_data
)) {
251 compile_clip_prog( brw
, &key
);
256 const struct brw_tracked_state brw_clip_prog
= {
258 .mesa
= _NEW_BUFFERS
|
262 .brw
= BRW_NEW_INTERPOLATION_MAP
|
263 BRW_NEW_REDUCED_PRIMITIVE
|
264 BRW_NEW_VUE_MAP_GEOM_OUT
,
266 .emit
= brw_upload_clip_prog