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25 * @file gen8_sol_state.c
27 * Controls the stream output logic (SOL) stage of the gen8 hardware, which is
28 * used to implement GL_EXT_transform_feedback.
31 #include "brw_context.h"
32 #include "brw_state.h"
33 #include "brw_defines.h"
34 #include "intel_batchbuffer.h"
35 #include "intel_buffer_objects.h"
36 #include "main/transformfeedback.h"
39 gen8_upload_3dstate_so_buffers(struct brw_context
*brw
)
41 struct gl_context
*ctx
= &brw
->ctx
;
42 /* BRW_NEW_TRANSFORM_FEEDBACK */
43 struct gl_transform_feedback_object
*xfb_obj
=
44 ctx
->TransformFeedback
.CurrentObject
;
45 struct brw_transform_feedback_object
*brw_obj
=
46 (struct brw_transform_feedback_object
*) xfb_obj
;
47 uint32_t mocs_wb
= brw
->gen
>= 9 ? SKL_MOCS_WB
: BDW_MOCS_WB
;
49 /* Set up the up to 4 output buffers. These are the ranges defined in the
50 * gl_transform_feedback_object.
52 for (int i
= 0; i
< 4; i
++) {
53 struct intel_buffer_object
*bufferobj
=
54 intel_buffer_object(xfb_obj
->Buffers
[i
]);
58 OUT_BATCH(_3DSTATE_SO_BUFFER
<< 16 | (8 - 2));
59 OUT_BATCH((i
<< SO_BUFFER_INDEX_SHIFT
));
70 uint32_t start
= xfb_obj
->Offset
[i
];
71 assert(start
% 4 == 0);
72 uint32_t end
= ALIGN(start
+ xfb_obj
->Size
[i
], 4);
74 intel_bufferobj_buffer(brw
, bufferobj
, start
, end
- start
);
75 assert(end
<= bo
->size
);
77 perf_debug("Missing MOCS setup for 3DSTATE_SO_BUFFER.");
80 OUT_BATCH(_3DSTATE_SO_BUFFER
<< 16 | (8 - 2));
81 OUT_BATCH(GEN8_SO_BUFFER_ENABLE
| (i
<< SO_BUFFER_INDEX_SHIFT
) |
82 GEN8_SO_BUFFER_OFFSET_WRITE_ENABLE
|
83 GEN8_SO_BUFFER_OFFSET_ADDRESS_ENABLE
|
85 OUT_RELOC64(bo
, I915_GEM_DOMAIN_RENDER
, I915_GEM_DOMAIN_RENDER
, start
);
86 OUT_BATCH(xfb_obj
->Size
[i
] / 4 - 1);
87 OUT_RELOC64(brw_obj
->offset_bo
,
88 I915_GEM_DOMAIN_INSTRUCTION
, I915_GEM_DOMAIN_INSTRUCTION
,
89 i
* sizeof(uint32_t));
90 if (brw_obj
->zero_offsets
)
91 OUT_BATCH(0); /* Zero out the offset and write that to offset_bo */
93 OUT_BATCH(0xFFFFFFFF); /* Use offset_bo as the "Stream Offset." */
96 brw_obj
->zero_offsets
= false;
100 gen8_upload_3dstate_streamout(struct brw_context
*brw
, bool active
,
101 struct brw_vue_map
*vue_map
)
103 struct gl_context
*ctx
= &brw
->ctx
;
105 /* BRW_NEW_TRANSFORM_FEEDBACK */
106 struct gl_transform_feedback_object
*xfb_obj
=
107 ctx
->TransformFeedback
.CurrentObject
;
108 const struct gl_transform_feedback_info
*linked_xfb_info
=
109 &xfb_obj
->shader_program
->LinkedTransformFeedback
;
110 uint32_t dw1
= 0, dw2
= 0, dw3
= 0, dw4
= 0;
113 int urb_entry_read_offset
= 0;
114 int urb_entry_read_length
= (vue_map
->num_slots
+ 1) / 2 -
115 urb_entry_read_offset
;
117 dw1
|= SO_FUNCTION_ENABLE
;
118 dw1
|= SO_STATISTICS_ENABLE
;
121 if (ctx
->Light
.ProvokingVertex
!= GL_FIRST_VERTEX_CONVENTION
)
122 dw1
|= SO_REORDER_TRAILING
;
124 /* We always read the whole vertex. This could be reduced at some
125 * point by reading less and offsetting the register index in the
128 dw2
|= SET_FIELD(urb_entry_read_offset
, SO_STREAM_0_VERTEX_READ_OFFSET
);
129 dw2
|= SET_FIELD(urb_entry_read_length
- 1, SO_STREAM_0_VERTEX_READ_LENGTH
);
131 dw2
|= SET_FIELD(urb_entry_read_offset
, SO_STREAM_1_VERTEX_READ_OFFSET
);
132 dw2
|= SET_FIELD(urb_entry_read_length
- 1, SO_STREAM_1_VERTEX_READ_LENGTH
);
134 dw2
|= SET_FIELD(urb_entry_read_offset
, SO_STREAM_2_VERTEX_READ_OFFSET
);
135 dw2
|= SET_FIELD(urb_entry_read_length
- 1, SO_STREAM_2_VERTEX_READ_LENGTH
);
137 dw2
|= SET_FIELD(urb_entry_read_offset
, SO_STREAM_3_VERTEX_READ_OFFSET
);
138 dw2
|= SET_FIELD(urb_entry_read_length
- 1, SO_STREAM_3_VERTEX_READ_LENGTH
);
140 /* Set buffer pitches; 0 means unbound. */
141 if (xfb_obj
->Buffers
[0])
142 dw3
|= linked_xfb_info
->BufferStride
[0] * 4;
143 if (xfb_obj
->Buffers
[1])
144 dw3
|= (linked_xfb_info
->BufferStride
[1] * 4) << 16;
145 if (xfb_obj
->Buffers
[2])
146 dw4
|= linked_xfb_info
->BufferStride
[2] * 4;
147 if (xfb_obj
->Buffers
[3])
148 dw4
|= (linked_xfb_info
->BufferStride
[3] * 4) << 16;
152 OUT_BATCH(_3DSTATE_STREAMOUT
<< 16 | (5 - 2));
161 upload_sol_state(struct brw_context
*brw
)
163 struct gl_context
*ctx
= &brw
->ctx
;
164 /* BRW_NEW_TRANSFORM_FEEDBACK */
165 bool active
= _mesa_is_xfb_active_and_unpaused(ctx
);
168 gen8_upload_3dstate_so_buffers(brw
);
169 /* BRW_NEW_VUE_MAP_GEOM_OUT */
170 gen7_upload_3dstate_so_decl_list(brw
, &brw
->vue_map_geom_out
);
173 gen8_upload_3dstate_streamout(brw
, active
, &brw
->vue_map_geom_out
);
176 const struct brw_tracked_state gen8_sol_state
= {
179 .brw
= BRW_NEW_BATCH
|
180 BRW_NEW_TRANSFORM_FEEDBACK
|
181 BRW_NEW_VUE_MAP_GEOM_OUT
,
183 .emit
= upload_sol_state
,