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
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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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
&& i
< linked_xfb_info
->NumOutputs
) {
51 unsigned buffer
= linked_xfb_info
->Outputs
[i
].OutputBuffer
;
52 unsigned buffer_offset
=
53 xfb_obj
->Offset
[buffer
] / 4 +
54 linked_xfb_info
->Outputs
[i
].DstOffset
;
55 brw_update_sol_surface(
56 brw
, xfb_obj
->Buffers
[buffer
], &brw
->bind
.surf_offset
[surf_index
],
57 linked_xfb_info
->Outputs
[i
].NumComponents
,
58 linked_xfb_info
->BufferStride
[buffer
], buffer_offset
);
60 brw
->bind
.surf_offset
[surf_index
] = 0;
65 const struct brw_tracked_state gen6_sol_surface
= {
67 .mesa
= _NEW_TRANSFORM_FEEDBACK
,
68 .brw
= (BRW_NEW_BATCH
|
69 BRW_NEW_VERTEX_PROGRAM
),
72 .emit
= gen6_update_sol_surfaces
,
76 brw_begin_transform_feedback(struct gl_context
*ctx
, GLenum mode
,
77 struct gl_transform_feedback_object
*obj
)
79 struct intel_context
*intel
= intel_context(ctx
);
80 const struct gl_shader_program
*vs_prog
=
81 ctx
->Shader
.CurrentVertexProgram
;
82 const struct gl_transform_feedback_info
*linked_xfb_info
=
83 &vs_prog
->LinkedTransformFeedback
;
84 struct gl_transform_feedback_object
*xfb_obj
=
85 ctx
->TransformFeedback
.CurrentObject
;
87 unsigned max_index
= 0xffffffff;
89 /* Compute the maximum number of vertices that we can write without
90 * overflowing any of the buffers currently being used for feedback.
92 for (int i
= 0; i
< BRW_MAX_SOL_BUFFERS
; ++i
) {
93 unsigned stride
= linked_xfb_info
->BufferStride
[i
];
95 /* Skip any inactive buffers, which have a stride of 0. */
99 unsigned max_for_this_buffer
= xfb_obj
->Size
[i
] / (4 * stride
);
100 max_index
= MIN2(max_index
, max_for_this_buffer
);
103 /* Initialize the SVBI 0 register to zero and set the maximum index. */
105 OUT_BATCH(_3DSTATE_GS_SVB_INDEX
<< 16 | (4 - 2));
106 OUT_BATCH(0); /* SVBI 0 */
108 OUT_BATCH(max_index
);
113 brw_end_transform_feedback(struct gl_context
*ctx
,
114 struct gl_transform_feedback_object
*obj
)
116 /* After EndTransformFeedback, it's likely that the client program will try
117 * to draw using the contents of the transform feedback buffer as vertex
118 * input. In order for this to work, we need to flush the data through at
119 * least the GS stage of the pipeline, and flush out the render cache. For
120 * simplicity, just do a full flush.
122 struct brw_context
*brw
= brw_context(ctx
);
123 struct intel_context
*intel
= &brw
->intel
;
124 intel_batchbuffer_emit_mi_flush(intel
);