2 * Copyright © 2011 Intel Corporation
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5 * copy of this software and associated documentation files (the "Software"),
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9 * Software is furnished to do so, subject to the following conditions:
11 * The above copyright notice and this permission notice (including the next
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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"
36 #include "main/transformfeedback.h"
39 upload_3dstate_so_buffers(struct brw_context
*brw
)
41 struct intel_context
*intel
= &brw
->intel
;
42 struct gl_context
*ctx
= &intel
->ctx
;
43 /* BRW_NEW_VERTEX_PROGRAM */
44 const struct gl_shader_program
*vs_prog
=
45 ctx
->Shader
.CurrentVertexProgram
;
46 const struct gl_transform_feedback_info
*linked_xfb_info
=
47 &vs_prog
->LinkedTransformFeedback
;
48 /* _NEW_TRANSFORM_FEEDBACK */
49 struct gl_transform_feedback_object
*xfb_obj
=
50 ctx
->TransformFeedback
.CurrentObject
;
53 /* Set up the up to 4 output buffers. These are the ranges defined in the
54 * gl_transform_feedback_object.
56 for (i
= 0; i
< 4; i
++) {
57 struct intel_buffer_object
*bufferobj
=
58 intel_buffer_object(xfb_obj
->Buffers
[i
]);
63 if (!xfb_obj
->Buffers
[i
]) {
64 /* The pitch of 0 in this command indicates that the buffer is
65 * unbound and won't be written to.
68 OUT_BATCH(_3DSTATE_SO_BUFFER
<< 16 | (4 - 2));
69 OUT_BATCH((i
<< SO_BUFFER_INDEX_SHIFT
));
77 bo
= intel_bufferobj_buffer(intel
, bufferobj
, INTEL_WRITE_PART
);
78 stride
= linked_xfb_info
->BufferStride
[i
] * 4;
80 start
= xfb_obj
->Offset
[i
];
81 assert(start
% 4 == 0);
82 end
= ALIGN(start
+ xfb_obj
->Size
[i
], 4);
83 assert(end
<= bo
->size
);
85 /* If we don't have hardware contexts, then we reset our offsets at the
86 * start of every batch, so we track the number of vertices written in
87 * software and increment our pointers by that many.
90 start
+= brw
->sol
.offset_0_batch_start
* stride
;
95 OUT_BATCH(_3DSTATE_SO_BUFFER
<< 16 | (4 - 2));
96 OUT_BATCH((i
<< SO_BUFFER_INDEX_SHIFT
) | stride
);
97 OUT_RELOC(bo
, I915_GEM_DOMAIN_RENDER
, I915_GEM_DOMAIN_RENDER
, start
);
98 OUT_RELOC(bo
, I915_GEM_DOMAIN_RENDER
, I915_GEM_DOMAIN_RENDER
, end
);
104 * Outputs the 3DSTATE_SO_DECL_LIST command.
106 * The data output is a series of 64-bit entries containing a SO_DECL per
107 * stream. We only have one stream of rendering coming out of the GS unit, so
108 * we only emit stream 0 (low 16 bits) SO_DECLs.
111 upload_3dstate_so_decl_list(struct brw_context
*brw
,
112 const struct brw_vue_map
*vue_map
)
114 struct intel_context
*intel
= &brw
->intel
;
115 struct gl_context
*ctx
= &intel
->ctx
;
116 /* BRW_NEW_VERTEX_PROGRAM */
117 const struct gl_shader_program
*vs_prog
=
118 ctx
->Shader
.CurrentVertexProgram
;
119 /* _NEW_TRANSFORM_FEEDBACK */
120 const struct gl_transform_feedback_info
*linked_xfb_info
=
121 &vs_prog
->LinkedTransformFeedback
;
123 uint16_t so_decl
[128];
125 int next_offset
[4] = {0, 0, 0, 0};
127 STATIC_ASSERT(ARRAY_SIZE(so_decl
) >= MAX_PROGRAM_OUTPUTS
);
129 /* Construct the list of SO_DECLs to be emitted. The formatting of the
130 * command is feels strange -- each dword pair contains a SO_DECL per stream.
132 for (i
= 0; i
< linked_xfb_info
->NumOutputs
; i
++) {
133 int buffer
= linked_xfb_info
->Outputs
[i
].OutputBuffer
;
135 int varying
= linked_xfb_info
->Outputs
[i
].OutputRegister
;
136 unsigned component_mask
=
137 (1 << linked_xfb_info
->Outputs
[i
].NumComponents
) - 1;
139 /* gl_PointSize is stored in VARYING_SLOT_PSIZ.w. */
140 if (varying
== VARYING_SLOT_PSIZ
) {
141 assert(linked_xfb_info
->Outputs
[i
].NumComponents
== 1);
142 component_mask
<<= 3;
144 component_mask
<<= linked_xfb_info
->Outputs
[i
].ComponentOffset
;
147 buffer_mask
|= 1 << buffer
;
149 decl
|= buffer
<< SO_DECL_OUTPUT_BUFFER_SLOT_SHIFT
;
150 decl
|= vue_map
->varying_to_slot
[varying
] <<
151 SO_DECL_REGISTER_INDEX_SHIFT
;
152 decl
|= component_mask
<< SO_DECL_COMPONENT_MASK_SHIFT
;
154 /* This assert should be true until GL_ARB_transform_feedback_instanced
155 * is added and we start using the hole flag.
157 assert(linked_xfb_info
->Outputs
[i
].DstOffset
== next_offset
[buffer
]);
159 next_offset
[buffer
] += linked_xfb_info
->Outputs
[i
].NumComponents
;
164 BEGIN_BATCH(linked_xfb_info
->NumOutputs
* 2 + 3);
165 OUT_BATCH(_3DSTATE_SO_DECL_LIST
<< 16 |
166 (linked_xfb_info
->NumOutputs
* 2 + 1));
168 OUT_BATCH((buffer_mask
<< SO_STREAM_TO_BUFFER_SELECTS_0_SHIFT
) |
169 (0 << SO_STREAM_TO_BUFFER_SELECTS_1_SHIFT
) |
170 (0 << SO_STREAM_TO_BUFFER_SELECTS_2_SHIFT
) |
171 (0 << SO_STREAM_TO_BUFFER_SELECTS_3_SHIFT
));
173 OUT_BATCH((linked_xfb_info
->NumOutputs
<< SO_NUM_ENTRIES_0_SHIFT
) |
174 (0 << SO_NUM_ENTRIES_1_SHIFT
) |
175 (0 << SO_NUM_ENTRIES_2_SHIFT
) |
176 (0 << SO_NUM_ENTRIES_3_SHIFT
));
178 for (i
= 0; i
< linked_xfb_info
->NumOutputs
; i
++) {
179 OUT_BATCH(so_decl
[i
]);
187 upload_3dstate_streamout(struct brw_context
*brw
, bool active
,
188 const struct brw_vue_map
*vue_map
)
190 struct intel_context
*intel
= &brw
->intel
;
191 struct gl_context
*ctx
= &intel
->ctx
;
192 /* _NEW_TRANSFORM_FEEDBACK */
193 struct gl_transform_feedback_object
*xfb_obj
=
194 ctx
->TransformFeedback
.CurrentObject
;
195 uint32_t dw1
= 0, dw2
= 0;
198 /* _NEW_RASTERIZER_DISCARD */
199 if (ctx
->RasterDiscard
)
200 dw1
|= SO_RENDERING_DISABLE
;
203 int urb_entry_read_offset
= 0;
204 int urb_entry_read_length
= (vue_map
->num_slots
+ 1) / 2 -
205 urb_entry_read_offset
;
207 dw1
|= SO_FUNCTION_ENABLE
;
208 dw1
|= SO_STATISTICS_ENABLE
;
211 if (ctx
->Light
.ProvokingVertex
!= GL_FIRST_VERTEX_CONVENTION
)
212 dw1
|= SO_REORDER_TRAILING
;
214 for (i
= 0; i
< 4; i
++) {
215 if (xfb_obj
->Buffers
[i
]) {
216 dw1
|= SO_BUFFER_ENABLE(i
);
220 /* We always read the whole vertex. This could be reduced at some
221 * point by reading less and offsetting the register index in the
224 dw2
|= urb_entry_read_offset
<< SO_STREAM_0_VERTEX_READ_OFFSET_SHIFT
;
225 dw2
|= (urb_entry_read_length
- 1) <<
226 SO_STREAM_0_VERTEX_READ_LENGTH_SHIFT
;
230 OUT_BATCH(_3DSTATE_STREAMOUT
<< 16 | (3 - 2));
237 upload_sol_state(struct brw_context
*brw
)
239 struct intel_context
*intel
= &brw
->intel
;
240 struct gl_context
*ctx
= &intel
->ctx
;
241 /* _NEW_TRANSFORM_FEEDBACK */
242 bool active
= _mesa_is_xfb_active_and_unpaused(ctx
);
245 upload_3dstate_so_buffers(brw
);
246 /* BRW_NEW_VUE_MAP_GEOM_OUT */
247 upload_3dstate_so_decl_list(brw
, &brw
->vue_map_geom_out
);
249 /* If we don't have hardware contexts, then some other client may have
250 * changed the SO write offsets, and we need to rewrite them.
253 intel
->batch
.needs_sol_reset
= true;
256 /* Finally, set up the SOL stage. This command must always follow updates to
257 * the nonpipelined SOL state (3DSTATE_SO_BUFFER, 3DSTATE_SO_DECL_LIST) or
258 * MMIO register updates (current performed by the kernel at each batch
261 upload_3dstate_streamout(brw
, active
, &brw
->vue_map_geom_out
);
264 const struct brw_tracked_state gen7_sol_state
= {
266 .mesa
= (_NEW_RASTERIZER_DISCARD
|
268 _NEW_TRANSFORM_FEEDBACK
),
269 .brw
= (BRW_NEW_BATCH
|
270 BRW_NEW_VERTEX_PROGRAM
|
271 BRW_NEW_VUE_MAP_GEOM_OUT
)
273 .emit
= upload_sol_state
,
277 gen7_end_transform_feedback(struct gl_context
*ctx
,
278 struct gl_transform_feedback_object
*obj
)
280 /* Because we have to rely on the kernel to reset our SO write offsets, and
281 * we only get to do it once per batchbuffer, flush the batch after feedback
282 * so another transform feedback can get the write offset reset it needs.
284 * This also covers any cache flushing required.
286 struct brw_context
*brw
= brw_context(ctx
);
287 struct intel_context
*intel
= &brw
->intel
;
289 intel_batchbuffer_flush(intel
);