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"),
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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
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
26 * Code to initialize the binding table entries used by transform feedback.
29 #include "main/macros.h"
30 #include "brw_context.h"
31 #include "intel_batchbuffer.h"
32 #include "brw_defines.h"
35 gen6_update_sol_surfaces(struct brw_context
*brw
)
37 struct gl_context
*ctx
= &brw
->intel
.ctx
;
38 /* _NEW_TRANSFORM_FEEDBACK */
39 struct gl_transform_feedback_object
*xfb_obj
=
40 ctx
->TransformFeedback
.CurrentObject
;
41 /* BRW_NEW_VERTEX_PROGRAM */
42 const struct gl_shader_program
*shaderprog
=
43 ctx
->Shader
.CurrentVertexProgram
;
44 const struct gl_transform_feedback_info
*linked_xfb_info
=
45 &shaderprog
->LinkedTransformFeedback
;
48 for (i
= 0; i
< BRW_MAX_SOL_BINDINGS
; ++i
) {
49 const int surf_index
= SURF_INDEX_SOL_BINDING(i
);
50 if (xfb_obj
->Active
&& !xfb_obj
->Paused
&&
51 i
< linked_xfb_info
->NumOutputs
) {
52 unsigned buffer
= linked_xfb_info
->Outputs
[i
].OutputBuffer
;
53 unsigned buffer_offset
=
54 xfb_obj
->Offset
[buffer
] / 4 +
55 linked_xfb_info
->Outputs
[i
].DstOffset
;
56 brw_update_sol_surface(
57 brw
, xfb_obj
->Buffers
[buffer
], &brw
->bind
.surf_offset
[surf_index
],
58 linked_xfb_info
->Outputs
[i
].NumComponents
,
59 linked_xfb_info
->BufferStride
[buffer
], buffer_offset
);
61 brw
->bind
.surf_offset
[surf_index
] = 0;
65 brw
->state
.dirty
.brw
|= BRW_NEW_SURFACES
;
68 const struct brw_tracked_state gen6_sol_surface
= {
70 .mesa
= _NEW_TRANSFORM_FEEDBACK
,
71 .brw
= (BRW_NEW_BATCH
|
72 BRW_NEW_VERTEX_PROGRAM
),
75 .emit
= gen6_update_sol_surfaces
,
79 gen6_update_sol_indices(struct brw_context
*brw
)
81 struct intel_context
*intel
= &brw
->intel
;
84 OUT_BATCH(_3DSTATE_GS_SVB_INDEX
<< 16 | (4 - 2));
85 OUT_BATCH(brw
->sol
.svbi_0_starting_index
); /* BRW_NEW_SOL_INDICES */
87 OUT_BATCH(brw
->sol
.svbi_0_max_index
); /* BRW_NEW_SOL_INDICES */
91 const struct brw_tracked_state gen6_sol_indices
= {
94 .brw
= (BRW_NEW_BATCH
|
98 .emit
= gen6_update_sol_indices
,
102 brw_begin_transform_feedback(struct gl_context
*ctx
, GLenum mode
,
103 struct gl_transform_feedback_object
*obj
)
105 struct brw_context
*brw
= brw_context(ctx
);
106 const struct gl_shader_program
*vs_prog
=
107 ctx
->Shader
.CurrentVertexProgram
;
108 const struct gl_transform_feedback_info
*linked_xfb_info
=
109 &vs_prog
->LinkedTransformFeedback
;
110 struct gl_transform_feedback_object
*xfb_obj
=
111 ctx
->TransformFeedback
.CurrentObject
;
113 unsigned max_index
= 0xffffffff;
115 /* Compute the maximum number of vertices that we can write without
116 * overflowing any of the buffers currently being used for feedback.
118 for (int i
= 0; i
< BRW_MAX_SOL_BUFFERS
; ++i
) {
119 unsigned stride
= linked_xfb_info
->BufferStride
[i
];
121 /* Skip any inactive buffers, which have a stride of 0. */
125 unsigned max_for_this_buffer
= xfb_obj
->Size
[i
] / (4 * stride
);
126 max_index
= MIN2(max_index
, max_for_this_buffer
);
129 /* Initialize the SVBI 0 register to zero and set the maximum index.
130 * These values will be sent to the hardware on the next draw.
132 brw
->state
.dirty
.brw
|= BRW_NEW_SOL_INDICES
;
133 brw
->sol
.svbi_0_starting_index
= 0;
134 brw
->sol
.svbi_0_max_index
= max_index
;
138 brw_end_transform_feedback(struct gl_context
*ctx
,
139 struct gl_transform_feedback_object
*obj
)
141 /* After EndTransformFeedback, it's likely that the client program will try
142 * to draw using the contents of the transform feedback buffer as vertex
143 * input. In order for this to work, we need to flush the data through at
144 * least the GS stage of the pipeline, and flush out the render cache. For
145 * simplicity, just do a full flush.
147 struct brw_context
*brw
= brw_context(ctx
);
148 struct intel_context
*intel
= &brw
->intel
;
149 intel_batchbuffer_emit_mi_flush(intel
);