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
;
63 memset(&c
, 0, sizeof(c
));
65 mem_ctx
= ralloc_context(NULL
);
67 /* Begin the compilation:
69 brw_init_compile(brw
, &c
.func
, mem_ctx
);
71 c
.func
.single_program_flow
= 1;
74 brw_compute_vue_map(&c
.vue_map
, intel
, c
.key
.nr_userclip
,
75 c
.key
.do_twoside_color
, c
.key
.attrs
);
77 /* Need to locate the two positions present in vertex + header.
78 * These are currently hardcoded:
80 c
.ndc_offset
= ATTR_SIZE
;
87 delta
= header_regs
* REG_SIZE
;
89 for (i
= 0; i
< VERT_RESULT_MAX
; i
++) {
90 if (c
.key
.attrs
& BITFIELD64_BIT(i
)) {
94 c
.idx_to_attr
[c
.nr_attrs
] = i
;
99 /* The vertex attributes start at a URB row-aligned offset after
100 * the 8-20 dword vertex header, and continue for a URB row-aligned
101 * length. nr_regs determines the urb_read_length from the start
102 * of the header to the end of the vertex data.
104 c
.nr_regs
= header_regs
+ (c
.nr_attrs
+ 1) / 2;
106 c
.nr_bytes
= c
.nr_regs
* REG_SIZE
;
108 c
.prog_data
.clip_mode
= c
.key
.clip_mode
; /* XXX */
110 /* For some reason the thread is spawned with only 4 channels
113 brw_set_mask_control(&c
.func
, BRW_MASK_DISABLE
);
116 /* Would ideally have the option of producing a program which could
119 switch (key
->primitive
) {
121 if (key
->do_unfilled
)
122 brw_emit_unfilled_clip( &c
);
124 brw_emit_tri_clip( &c
);
127 brw_emit_line_clip( &c
);
130 brw_emit_point_clip( &c
);
141 program
= brw_get_program(&c
.func
, &program_size
);
143 if (unlikely(INTEL_DEBUG
& DEBUG_CLIP
)) {
145 for (i
= 0; i
< program_size
/ sizeof(struct brw_instruction
); i
++)
146 brw_disasm(stdout
, &((struct brw_instruction
*)program
)[i
],
151 brw_upload_cache(&brw
->cache
,
153 &c
.key
, sizeof(c
.key
),
154 program
, program_size
,
155 &c
.prog_data
, sizeof(c
.prog_data
),
156 &brw
->clip
.prog_offset
, &brw
->clip
.prog_data
);
157 ralloc_free(mem_ctx
);
160 /* Calculate interpolants for triangle and line rasterization.
162 static void upload_clip_prog(struct brw_context
*brw
)
164 struct intel_context
*intel
= &brw
->intel
;
165 struct gl_context
*ctx
= &intel
->ctx
;
166 struct brw_clip_prog_key key
;
168 memset(&key
, 0, sizeof(key
));
172 /* BRW_NEW_REDUCED_PRIMITIVE */
173 key
.primitive
= brw
->intel
.reduced_primitive
;
174 /* CACHE_NEW_VS_PROG */
175 key
.attrs
= brw
->vs
.prog_data
->outputs_written
;
177 key
.do_flat_shading
= (ctx
->Light
.ShadeModel
== GL_FLAT
);
178 key
.pv_first
= (ctx
->Light
.ProvokingVertex
== GL_FIRST_VERTEX_CONVENTION
);
179 key
.do_twoside_color
= (ctx
->Light
.Enabled
&& ctx
->Light
.Model
.TwoSide
);
181 key
.nr_userclip
= brw_count_bits(ctx
->Transform
.ClipPlanesEnabled
);
184 key
.clip_mode
= BRW_CLIPMODE_KERNEL_CLIP
;
186 key
.clip_mode
= BRW_CLIPMODE_NORMAL
;
189 if (key
.primitive
== GL_TRIANGLES
) {
190 if (ctx
->Polygon
.CullFlag
&&
191 ctx
->Polygon
.CullFaceMode
== GL_FRONT_AND_BACK
)
192 key
.clip_mode
= BRW_CLIPMODE_REJECT_ALL
;
194 GLuint fill_front
= CLIP_CULL
;
195 GLuint fill_back
= CLIP_CULL
;
196 GLuint offset_front
= 0;
197 GLuint offset_back
= 0;
199 if (!ctx
->Polygon
.CullFlag
||
200 ctx
->Polygon
.CullFaceMode
!= GL_FRONT
) {
201 switch (ctx
->Polygon
.FrontMode
) {
203 fill_front
= CLIP_FILL
;
207 fill_front
= CLIP_LINE
;
208 offset_front
= ctx
->Polygon
.OffsetLine
;
211 fill_front
= CLIP_POINT
;
212 offset_front
= ctx
->Polygon
.OffsetPoint
;
217 if (!ctx
->Polygon
.CullFlag
||
218 ctx
->Polygon
.CullFaceMode
!= GL_BACK
) {
219 switch (ctx
->Polygon
.BackMode
) {
221 fill_back
= CLIP_FILL
;
225 fill_back
= CLIP_LINE
;
226 offset_back
= ctx
->Polygon
.OffsetLine
;
229 fill_back
= CLIP_POINT
;
230 offset_back
= ctx
->Polygon
.OffsetPoint
;
235 if (ctx
->Polygon
.BackMode
!= GL_FILL
||
236 ctx
->Polygon
.FrontMode
!= GL_FILL
) {
239 /* Most cases the fixed function units will handle. Cases where
240 * one or more polygon faces are unfilled will require help:
242 key
.clip_mode
= BRW_CLIPMODE_CLIP_NON_REJECTED
;
244 if (offset_back
|| offset_front
) {
245 /* _NEW_POLYGON, _NEW_BUFFERS */
246 key
.offset_units
= ctx
->Polygon
.OffsetUnits
* brw
->intel
.polygon_offset_scale
;
247 key
.offset_factor
= ctx
->Polygon
.OffsetFactor
* ctx
->DrawBuffer
->_MRD
;
250 switch (ctx
->Polygon
.FrontFace
) {
252 key
.fill_ccw
= fill_front
;
253 key
.fill_cw
= fill_back
;
254 key
.offset_ccw
= offset_front
;
255 key
.offset_cw
= offset_back
;
256 if (ctx
->Light
.Model
.TwoSide
&&
257 key
.fill_cw
!= CLIP_CULL
)
261 key
.fill_cw
= fill_front
;
262 key
.fill_ccw
= fill_back
;
263 key
.offset_cw
= offset_front
;
264 key
.offset_ccw
= offset_back
;
265 if (ctx
->Light
.Model
.TwoSide
&&
266 key
.fill_ccw
!= CLIP_CULL
)
267 key
.copy_bfc_ccw
= 1;
274 if (!brw_search_cache(&brw
->cache
, BRW_CLIP_PROG
,
276 &brw
->clip
.prog_offset
, &brw
->clip
.prog_data
)) {
277 compile_clip_prog( brw
, &key
);
282 const struct brw_tracked_state brw_clip_prog
= {
284 .mesa
= (_NEW_LIGHT
|
288 .brw
= (BRW_NEW_REDUCED_PRIMITIVE
),
289 .cache
= CACHE_NEW_VS_PROG
291 .prepare
= upload_clip_prog