2 * Copyright © 2012 Intel Corporation
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
24 * Jordan Justen <jordan.l.justen@intel.com>
28 #include "main/imports.h"
29 #include "main/bufferobj.h"
30 #include "main/varray.h"
33 #include "brw_context.h"
34 #include "brw_defines.h"
37 #include "intel_batchbuffer.h"
40 * Check if the hardware's cut index support can handle the primitive
41 * restart index value (pre-Haswell only).
44 can_cut_index_handle_restart_index(struct gl_context
*ctx
,
45 const struct _mesa_index_buffer
*ib
)
47 /* The FixedIndex variant means 0xFF, 0xFFFF, or 0xFFFFFFFF based on
48 * the index buffer type, which corresponds exactly to the hardware.
50 if (ctx
->Array
.PrimitiveRestartFixedIndex
)
53 bool cut_index_will_work
;
55 switch (ib
->index_size
) {
57 cut_index_will_work
= ctx
->Array
.RestartIndex
== 0xff;
60 cut_index_will_work
= ctx
->Array
.RestartIndex
== 0xffff;
63 cut_index_will_work
= ctx
->Array
.RestartIndex
== 0xffffffff;
66 unreachable("not reached");
69 return cut_index_will_work
;
73 * Check if the hardware's cut index support can handle the primitive
77 can_cut_index_handle_prims(struct gl_context
*ctx
,
78 const struct _mesa_prim
*prim
,
80 const struct _mesa_index_buffer
*ib
)
82 struct brw_context
*brw
= brw_context(ctx
);
83 const struct gen_device_info
*devinfo
= &brw
->screen
->devinfo
;
85 /* Otherwise Haswell can do it all. */
86 if (devinfo
->gen
>= 8 || devinfo
->is_haswell
)
89 if (!can_cut_index_handle_restart_index(ctx
, ib
)) {
90 /* The primitive restart index can't be handled, so take
96 for (unsigned i
= 0; i
< nr_prims
; i
++) {
97 switch (prim
[i
].mode
) {
102 case GL_TRIANGLE_STRIP
:
103 case GL_LINES_ADJACENCY
:
104 case GL_LINE_STRIP_ADJACENCY
:
105 case GL_TRIANGLES_ADJACENCY
:
106 case GL_TRIANGLE_STRIP_ADJACENCY
:
107 /* Cut index supports these primitive types */
110 /* Cut index does not support these primitive types */
112 //case GL_TRIANGLE_FAN:
114 //case GL_QUAD_STRIP:
124 * Check if primitive restart is enabled, and if so, handle it properly.
126 * In some cases the support will be handled in software. When available
127 * hardware will handle primitive restart.
130 brw_handle_primitive_restart(struct gl_context
*ctx
,
131 const struct _mesa_prim
*prims
,
133 const struct _mesa_index_buffer
*ib
)
135 struct brw_context
*brw
= brw_context(ctx
);
137 /* We only need to handle cases where there is an index buffer. */
142 /* If we have set the in_progress flag, then we are in the middle
143 * of handling the primitive restart draw.
145 if (brw
->prim_restart
.in_progress
) {
149 /* If PrimitiveRestart is not enabled, then we aren't concerned about
150 * handling this draw.
152 if (!(ctx
->Array
._PrimitiveRestart
)) {
156 /* Signal that we are in the process of handling the
157 * primitive restart draw
159 brw
->prim_restart
.in_progress
= true;
161 if (can_cut_index_handle_prims(ctx
, prims
, nr_prims
, ib
)) {
162 /* Cut index should work for primitive restart, so use it
164 brw
->prim_restart
.enable_cut_index
= true;
165 brw_draw_prims(ctx
, prims
, nr_prims
, ib
, GL_FALSE
, -1, -1, NULL
, 0,
167 brw
->prim_restart
.enable_cut_index
= false;
169 /* Not all the primitive draw modes are supported by the cut index,
170 * so take the software path
172 struct gl_buffer_object
*indirect_data
= brw
->draw
.draw_indirect_data
;
174 /* Clear this to make the draw direct. */
175 brw
->draw
.draw_indirect_data
= NULL
;
177 vbo_sw_primitive_restart(ctx
, prims
, nr_prims
, ib
, indirect_data
);
180 brw
->prim_restart
.in_progress
= false;
182 /* The primitive restart draw was completed, so return true. */