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 "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 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
);
113 brw_compact_instructions(&c
.func
, 0, 0, NULL
);
117 program
= brw_get_program(&c
.func
, &program_size
);
119 if (unlikely(INTEL_DEBUG
& DEBUG_CLIP
)) {
120 fprintf(stderr
, "clip:\n");
121 brw_disassemble(brw
, c
.func
.store
, 0, program_size
, stderr
);
122 fprintf(stderr
, "\n");
125 brw_upload_cache(&brw
->cache
,
127 &c
.key
, sizeof(c
.key
),
128 program
, program_size
,
129 &c
.prog_data
, sizeof(c
.prog_data
),
130 &brw
->clip
.prog_offset
, &brw
->clip
.prog_data
);
131 ralloc_free(mem_ctx
);
134 /* Calculate interpolants for triangle and line rasterization.
137 brw_upload_clip_prog(struct brw_context
*brw
)
139 struct gl_context
*ctx
= &brw
->ctx
;
140 struct brw_clip_prog_key key
;
142 memset(&key
, 0, sizeof(key
));
147 /* BRW_NEW_INTERPOLATION_MAP */
148 key
.interpolation_mode
= brw
->interpolation_mode
;
150 /* BRW_NEW_REDUCED_PRIMITIVE */
151 key
.primitive
= brw
->reduced_primitive
;
152 /* BRW_NEW_VUE_MAP_GEOM_OUT */
153 key
.attrs
= brw
->vue_map_geom_out
.slots_valid
;
156 key
.pv_first
= (ctx
->Light
.ProvokingVertex
== GL_FIRST_VERTEX_CONVENTION
);
157 /* _NEW_TRANSFORM (also part of VUE map)*/
158 if (ctx
->Transform
.ClipPlanesEnabled
)
159 key
.nr_userclip
= _mesa_logbase2(ctx
->Transform
.ClipPlanesEnabled
) + 1;
162 key
.clip_mode
= BRW_CLIPMODE_KERNEL_CLIP
;
164 key
.clip_mode
= BRW_CLIPMODE_NORMAL
;
167 if (key
.primitive
== GL_TRIANGLES
) {
168 if (ctx
->Polygon
.CullFlag
&&
169 ctx
->Polygon
.CullFaceMode
== GL_FRONT_AND_BACK
)
170 key
.clip_mode
= BRW_CLIPMODE_REJECT_ALL
;
172 GLuint fill_front
= CLIP_CULL
;
173 GLuint fill_back
= CLIP_CULL
;
174 GLuint offset_front
= 0;
175 GLuint offset_back
= 0;
177 if (!ctx
->Polygon
.CullFlag
||
178 ctx
->Polygon
.CullFaceMode
!= GL_FRONT
) {
179 switch (ctx
->Polygon
.FrontMode
) {
181 fill_front
= CLIP_FILL
;
185 fill_front
= CLIP_LINE
;
186 offset_front
= ctx
->Polygon
.OffsetLine
;
189 fill_front
= CLIP_POINT
;
190 offset_front
= ctx
->Polygon
.OffsetPoint
;
195 if (!ctx
->Polygon
.CullFlag
||
196 ctx
->Polygon
.CullFaceMode
!= GL_BACK
) {
197 switch (ctx
->Polygon
.BackMode
) {
199 fill_back
= CLIP_FILL
;
203 fill_back
= CLIP_LINE
;
204 offset_back
= ctx
->Polygon
.OffsetLine
;
207 fill_back
= CLIP_POINT
;
208 offset_back
= ctx
->Polygon
.OffsetPoint
;
213 if (ctx
->Polygon
.BackMode
!= GL_FILL
||
214 ctx
->Polygon
.FrontMode
!= GL_FILL
) {
217 /* Most cases the fixed function units will handle. Cases where
218 * one or more polygon faces are unfilled will require help:
220 key
.clip_mode
= BRW_CLIPMODE_CLIP_NON_REJECTED
;
222 if (offset_back
|| offset_front
) {
223 /* _NEW_POLYGON, _NEW_BUFFERS */
224 key
.offset_units
= ctx
->Polygon
.OffsetUnits
* ctx
->DrawBuffer
->_MRD
* 2;
225 key
.offset_factor
= ctx
->Polygon
.OffsetFactor
* ctx
->DrawBuffer
->_MRD
;
228 switch (ctx
->Polygon
.FrontFace
) {
230 key
.fill_ccw
= fill_front
;
231 key
.fill_cw
= fill_back
;
232 key
.offset_ccw
= offset_front
;
233 key
.offset_cw
= offset_back
;
234 if (ctx
->Light
.Model
.TwoSide
&&
235 key
.fill_cw
!= CLIP_CULL
)
239 key
.fill_cw
= fill_front
;
240 key
.fill_ccw
= fill_back
;
241 key
.offset_cw
= offset_front
;
242 key
.offset_ccw
= offset_back
;
243 if (ctx
->Light
.Model
.TwoSide
&&
244 key
.fill_ccw
!= CLIP_CULL
)
245 key
.copy_bfc_ccw
= 1;
252 if (!brw_search_cache(&brw
->cache
, BRW_CLIP_PROG
,
254 &brw
->clip
.prog_offset
, &brw
->clip
.prog_data
)) {
255 compile_clip_prog( brw
, &key
);
260 const struct brw_tracked_state brw_clip_prog
= {
262 .mesa
= (_NEW_LIGHT
|
266 .brw
= (BRW_NEW_REDUCED_PRIMITIVE
|
267 BRW_NEW_VUE_MAP_GEOM_OUT
|
268 BRW_NEW_INTERPOLATION_MAP
)
270 .emit
= brw_upload_clip_prog