2 * Copyright © 2011 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
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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
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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
25 * @file gen7_sol_state.c
27 * Controls the stream output logic (SOL) stage of the gen7 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"
38 upload_3dstate_so_buffers(struct brw_context
*brw
)
40 struct intel_context
*intel
= &brw
->intel
;
41 struct gl_context
*ctx
= &intel
->ctx
;
42 /* BRW_NEW_VERTEX_PROGRAM */
43 const struct gl_shader_program
*vs_prog
=
44 ctx
->Shader
.CurrentVertexProgram
;
45 const struct gl_transform_feedback_info
*linked_xfb_info
=
46 &vs_prog
->LinkedTransformFeedback
;
47 /* _NEW_TRANSFORM_FEEDBACK */
48 struct gl_transform_feedback_object
*xfb_obj
=
49 ctx
->TransformFeedback
.CurrentObject
;
52 /* Set up the up to 4 output buffers. These are the ranges defined in the
53 * gl_transform_feedback_object.
55 for (i
= 0; i
< 4; i
++) {
56 struct gl_buffer_object
*bufferobj
= xfb_obj
->Buffers
[i
];
60 if (!xfb_obj
->Buffers
[i
]) {
61 /* The pitch of 0 in this command indicates that the buffer is
62 * unbound and won't be written to.
65 OUT_BATCH(_3DSTATE_SO_BUFFER
<< 16 | (4 - 2));
66 OUT_BATCH((i
<< SO_BUFFER_INDEX_SHIFT
));
74 bo
= intel_buffer_object(bufferobj
)->buffer
;
76 start
= xfb_obj
->Offset
[i
];
77 assert(start
% 4 == 0);
78 end
= ALIGN(start
+ xfb_obj
->Size
[i
], 4);
79 assert(end
<= bo
->size
);
82 OUT_BATCH(_3DSTATE_SO_BUFFER
<< 16 | (4 - 2));
83 OUT_BATCH((i
<< SO_BUFFER_INDEX_SHIFT
) |
84 ((linked_xfb_info
->BufferStride
[i
] * 4) <<
85 SO_BUFFER_PITCH_SHIFT
));
86 OUT_RELOC(bo
, I915_GEM_DOMAIN_RENDER
, I915_GEM_DOMAIN_RENDER
, start
);
87 OUT_RELOC(bo
, I915_GEM_DOMAIN_RENDER
, I915_GEM_DOMAIN_RENDER
, end
);
93 * Outputs the 3DSTATE_SO_DECL_LIST command.
95 * The data output is a series of 64-bit entries containing a SO_DECL per
96 * stream. We only have one stream of rendering coming out of the GS unit, so
97 * we only emit stream 0 (low 16 bits) SO_DECLs.
100 upload_3dstate_so_decl_list(struct brw_context
*brw
,
101 struct brw_vue_map
*vue_map
)
103 struct intel_context
*intel
= &brw
->intel
;
104 struct gl_context
*ctx
= &intel
->ctx
;
105 /* BRW_NEW_VERTEX_PROGRAM */
106 const struct gl_shader_program
*vs_prog
=
107 ctx
->Shader
.CurrentVertexProgram
;
108 /* _NEW_TRANSFORM_FEEDBACK */
109 const struct gl_transform_feedback_info
*linked_xfb_info
=
110 &vs_prog
->LinkedTransformFeedback
;
112 uint16_t so_decl
[128];
114 int next_offset
[4] = {0, 0, 0, 0};
116 STATIC_ASSERT(ARRAY_SIZE(so_decl
) >= MAX_PROGRAM_OUTPUTS
);
118 /* Construct the list of SO_DECLs to be emitted. The formatting of the
119 * command is feels strange -- each dword pair contains a SO_DECL per stream.
121 for (i
= 0; i
< linked_xfb_info
->NumOutputs
; i
++) {
122 int buffer
= linked_xfb_info
->Outputs
[i
].OutputBuffer
;
124 int vert_result
= linked_xfb_info
->Outputs
[i
].OutputRegister
;
126 buffer_mask
|= 1 << buffer
;
128 decl
|= buffer
<< SO_DECL_OUTPUT_BUFFER_SLOT_SHIFT
;
129 decl
|= vue_map
->vert_result_to_slot
[vert_result
] <<
130 SO_DECL_REGISTER_INDEX_SHIFT
;
131 decl
|= ((1 << linked_xfb_info
->Outputs
[i
].NumComponents
) - 1) <<
132 SO_DECL_COMPONENT_MASK_SHIFT
;
134 /* This assert should be true until GL_ARB_transform_feedback_instanced
135 * is added and we start using the hole flag.
137 assert(linked_xfb_info
->Outputs
[i
].DstOffset
== next_offset
[buffer
]);
139 next_offset
[buffer
] += linked_xfb_info
->Outputs
[i
].NumComponents
;
144 BEGIN_BATCH(linked_xfb_info
->NumOutputs
* 2 + 3);
145 OUT_BATCH(_3DSTATE_SO_DECL_LIST
<< 16 |
146 (linked_xfb_info
->NumOutputs
* 2 + 1));
148 OUT_BATCH((buffer_mask
<< SO_STREAM_TO_BUFFER_SELECTS_0_SHIFT
) |
149 (0 << SO_STREAM_TO_BUFFER_SELECTS_1_SHIFT
) |
150 (0 << SO_STREAM_TO_BUFFER_SELECTS_2_SHIFT
) |
151 (0 << SO_STREAM_TO_BUFFER_SELECTS_3_SHIFT
));
153 OUT_BATCH((linked_xfb_info
->NumOutputs
<< SO_NUM_ENTRIES_0_SHIFT
) |
154 (0 << SO_NUM_ENTRIES_1_SHIFT
) |
155 (0 << SO_NUM_ENTRIES_2_SHIFT
) |
156 (0 << SO_NUM_ENTRIES_3_SHIFT
));
158 for (i
= 0; i
< linked_xfb_info
->NumOutputs
; i
++) {
159 OUT_BATCH(so_decl
[i
]);
167 upload_3dstate_streamout(struct brw_context
*brw
, bool active
,
168 struct brw_vue_map
*vue_map
)
170 struct intel_context
*intel
= &brw
->intel
;
171 struct gl_context
*ctx
= &intel
->ctx
;
172 /* _NEW_TRANSFORM_FEEDBACK */
173 struct gl_transform_feedback_object
*xfb_obj
=
174 ctx
->TransformFeedback
.CurrentObject
;
175 uint32_t dw1
= 0, dw2
= 0;
178 /* _NEW_RASTERIZER_DISCARD */
179 if (ctx
->RasterDiscard
)
180 dw1
|= SO_RENDERING_DISABLE
;
183 int urb_entry_read_offset
= 0;
184 int urb_entry_read_length
= (vue_map
->num_slots
+ 1) / 2 -
185 urb_entry_read_offset
;
187 dw1
|= SO_FUNCTION_ENABLE
;
188 dw1
|= SO_STATISTICS_ENABLE
;
191 if (ctx
->Light
.ProvokingVertex
!= GL_FIRST_VERTEX_CONVENTION
)
192 dw1
|= SO_REORDER_TRAILING
;
194 for (i
= 0; i
< 4; i
++) {
195 if (xfb_obj
->Buffers
[i
]) {
196 dw1
|= SO_BUFFER_ENABLE(i
);
200 /* We always read the whole vertex. This could be reduced at some
201 * point by reading less and offsetting the register index in the
204 dw2
|= urb_entry_read_offset
<< SO_STREAM_0_VERTEX_READ_OFFSET_SHIFT
;
205 dw2
|= (urb_entry_read_length
- 1) <<
206 SO_STREAM_0_VERTEX_READ_LENGTH_SHIFT
;
210 OUT_BATCH(_3DSTATE_STREAMOUT
<< 16 | (3 - 2));
217 upload_sol_state(struct brw_context
*brw
)
219 struct intel_context
*intel
= &brw
->intel
;
220 struct gl_context
*ctx
= &intel
->ctx
;
221 /* _NEW_TRANSFORM_FEEDBACK */
222 struct gl_transform_feedback_object
*xfb_obj
=
223 ctx
->TransformFeedback
.CurrentObject
;
224 bool active
= xfb_obj
->Active
&& !xfb_obj
->Paused
;
225 struct brw_vue_map vue_map
;
227 /* _NEW_TRANSFORM, CACHE_NEW_VS_PROG */
228 brw_compute_vue_map(&vue_map
, intel
, ctx
->Transform
.ClipPlanesEnabled
!= 0,
229 brw
->vs
.prog_data
->outputs_written
);
232 upload_3dstate_so_buffers(brw
);
233 upload_3dstate_so_decl_list(brw
, &vue_map
);
236 /* Finally, set up the SOL stage. This command must always follow updates to
237 * the nonpipelined SOL state (3DSTATE_SO_BUFFER, 3DSTATE_SO_DECL_LIST) or
238 * MMIO register updates (current performed by the kernel at each batch
241 upload_3dstate_streamout(brw
, active
, &vue_map
);
244 const struct brw_tracked_state gen7_sol_state
= {
246 .mesa
= (_NEW_RASTERIZER_DISCARD
|
248 _NEW_TRANSFORM_FEEDBACK
|
250 .brw
= (BRW_NEW_BATCH
|
251 BRW_NEW_VERTEX_PROGRAM
),
252 .cache
= CACHE_NEW_VS_PROG
,
254 .emit
= upload_sol_state
,