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
7
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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
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));
86
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;
135
brw->sol.offset_0_batch_start = 0;
139
brw_end_transform_feedback(struct gl_context *ctx,
140
struct gl_transform_feedback_object *obj)
142
/* After EndTransformFeedback, it's likely that the client program will try
143
* to draw using the contents of the transform feedback buffer as vertex
144
* input. In order for this to work, we need to flush the data through at
145
* least the GS stage of the pipeline, and flush out the render cache. For
146
* simplicity, just do a full flush.
148
struct brw_context *brw = brw_context(ctx);
149
struct intel_context *intel = &brw->intel;
150
intel_batchbuffer_emit_mi_flush(intel);