2 Copyright (C) Intel Corp. 2006. All Rights Reserved.
3 Intel funded Tungsten Graphics (http://www.tungstengraphics.com) 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 <keith@tungstengraphics.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 "glsl/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 intel_context
*intel
= &brw
->intel
;
55 struct brw_clip_compile c
;
56 const GLuint
*program
;
61 memset(&c
, 0, sizeof(c
));
63 mem_ctx
= ralloc_context(NULL
);
65 /* Begin the compilation:
67 brw_init_compile(brw
, &c
.func
, mem_ctx
);
69 c
.func
.single_program_flow
= 1;
72 brw_compute_vue_map(&c
.vue_map
, intel
, c
.key
.nr_userclip
> 0, c
.key
.attrs
);
74 /* nr_regs is the number of registers filled by reading data from the VUE.
75 * This program accesses the entire VUE, so nr_regs needs to be the size of
76 * the VUE (measured in pairs, since two slots are stored in each
79 c
.nr_regs
= (c
.vue_map
.num_slots
+ 1)/2;
81 c
.prog_data
.clip_mode
= c
.key
.clip_mode
; /* XXX */
83 /* For some reason the thread is spawned with only 4 channels
86 brw_set_mask_control(&c
.func
, BRW_MASK_DISABLE
);
89 /* Would ideally have the option of producing a program which could
92 switch (key
->primitive
) {
95 brw_emit_unfilled_clip( &c
);
97 brw_emit_tri_clip( &c
);
100 brw_emit_line_clip( &c
);
103 brw_emit_point_clip( &c
);
114 program
= brw_get_program(&c
.func
, &program_size
);
116 if (unlikely(INTEL_DEBUG
& DEBUG_CLIP
)) {
118 for (i
= 0; i
< program_size
/ sizeof(struct brw_instruction
); i
++)
119 brw_disasm(stdout
, &((struct brw_instruction
*)program
)[i
],
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.
135 static void upload_clip_prog(struct brw_context
*brw
)
137 struct intel_context
*intel
= &brw
->intel
;
138 struct gl_context
*ctx
= &intel
->ctx
;
139 struct brw_clip_prog_key key
;
141 memset(&key
, 0, sizeof(key
));
145 /* BRW_NEW_REDUCED_PRIMITIVE */
146 key
.primitive
= brw
->intel
.reduced_primitive
;
147 /* CACHE_NEW_VS_PROG */
148 key
.attrs
= brw
->vs
.prog_data
->outputs_written
;
150 key
.do_flat_shading
= (ctx
->Light
.ShadeModel
== GL_FLAT
);
151 key
.pv_first
= (ctx
->Light
.ProvokingVertex
== GL_FIRST_VERTEX_CONVENTION
);
153 key
.nr_userclip
= _mesa_bitcount_64(ctx
->Transform
.ClipPlanesEnabled
);
156 key
.clip_mode
= BRW_CLIPMODE_KERNEL_CLIP
;
158 key
.clip_mode
= BRW_CLIPMODE_NORMAL
;
161 if (key
.primitive
== GL_TRIANGLES
) {
162 if (ctx
->Polygon
.CullFlag
&&
163 ctx
->Polygon
.CullFaceMode
== GL_FRONT_AND_BACK
)
164 key
.clip_mode
= BRW_CLIPMODE_REJECT_ALL
;
166 GLuint fill_front
= CLIP_CULL
;
167 GLuint fill_back
= CLIP_CULL
;
168 GLuint offset_front
= 0;
169 GLuint offset_back
= 0;
171 if (!ctx
->Polygon
.CullFlag
||
172 ctx
->Polygon
.CullFaceMode
!= GL_FRONT
) {
173 switch (ctx
->Polygon
.FrontMode
) {
175 fill_front
= CLIP_FILL
;
179 fill_front
= CLIP_LINE
;
180 offset_front
= ctx
->Polygon
.OffsetLine
;
183 fill_front
= CLIP_POINT
;
184 offset_front
= ctx
->Polygon
.OffsetPoint
;
189 if (!ctx
->Polygon
.CullFlag
||
190 ctx
->Polygon
.CullFaceMode
!= GL_BACK
) {
191 switch (ctx
->Polygon
.BackMode
) {
193 fill_back
= CLIP_FILL
;
197 fill_back
= CLIP_LINE
;
198 offset_back
= ctx
->Polygon
.OffsetLine
;
201 fill_back
= CLIP_POINT
;
202 offset_back
= ctx
->Polygon
.OffsetPoint
;
207 if (ctx
->Polygon
.BackMode
!= GL_FILL
||
208 ctx
->Polygon
.FrontMode
!= GL_FILL
) {
211 /* Most cases the fixed function units will handle. Cases where
212 * one or more polygon faces are unfilled will require help:
214 key
.clip_mode
= BRW_CLIPMODE_CLIP_NON_REJECTED
;
216 if (offset_back
|| offset_front
) {
217 /* _NEW_POLYGON, _NEW_BUFFERS */
218 key
.offset_units
= ctx
->Polygon
.OffsetUnits
* brw
->intel
.polygon_offset_scale
;
219 key
.offset_factor
= ctx
->Polygon
.OffsetFactor
* ctx
->DrawBuffer
->_MRD
;
222 switch (ctx
->Polygon
.FrontFace
) {
224 key
.fill_ccw
= fill_front
;
225 key
.fill_cw
= fill_back
;
226 key
.offset_ccw
= offset_front
;
227 key
.offset_cw
= offset_back
;
228 if (ctx
->Light
.Model
.TwoSide
&&
229 key
.fill_cw
!= CLIP_CULL
)
233 key
.fill_cw
= fill_front
;
234 key
.fill_ccw
= fill_back
;
235 key
.offset_cw
= offset_front
;
236 key
.offset_ccw
= offset_back
;
237 if (ctx
->Light
.Model
.TwoSide
&&
238 key
.fill_ccw
!= CLIP_CULL
)
239 key
.copy_bfc_ccw
= 1;
246 if (!brw_search_cache(&brw
->cache
, BRW_CLIP_PROG
,
248 &brw
->clip
.prog_offset
, &brw
->clip
.prog_data
)) {
249 compile_clip_prog( brw
, &key
);
254 const struct brw_tracked_state brw_clip_prog
= {
256 .mesa
= (_NEW_LIGHT
|
260 .brw
= (BRW_NEW_REDUCED_PRIMITIVE
),
261 .cache
= CACHE_NEW_VS_PROG
263 .prepare
= upload_clip_prog