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/*
* Copyright © 2011 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
/**
* @file gen7_sol_state.c
*
* Controls the stream output logic (SOL) stage of the gen7 hardware, which is
* used to implement GL_EXT_transform_feedback.
*/
#include "brw_context.h"
#include "brw_state.h"
#include "brw_defines.h"
#include "intel_batchbuffer.h"
#include "intel_buffer_objects.h"
#include "main/transformfeedback.h"
void
gen7_begin_transform_feedback(struct gl_context *ctx, GLenum mode,
struct gl_transform_feedback_object *obj)
{
struct brw_context *brw = brw_context(ctx);
struct brw_transform_feedback_object *brw_obj =
(struct brw_transform_feedback_object *) obj;
const struct gen_device_info *devinfo = &brw->screen->devinfo;
assert(devinfo->gen == 7);
/* We're about to lose the information needed to compute the number of
* vertices written during the last Begin/EndTransformFeedback section,
* so we can't delay it any further.
*/
brw_compute_xfb_vertices_written(brw, brw_obj);
/* No primitives have been generated yet. */
for (int i = 0; i < BRW_MAX_XFB_STREAMS; i++) {
brw_obj->prims_generated[i] = 0;
}
/* Store the starting value of the SO_NUM_PRIMS_WRITTEN counters. */
brw_save_primitives_written_counters(brw, brw_obj);
/* Reset the SO buffer offsets to 0. */
if (!can_do_pipelined_register_writes(brw->screen)) {
intel_batchbuffer_flush(brw);
brw->batch.needs_sol_reset = true;
} else {
for (int i = 0; i < 4; i++) {
BEGIN_BATCH(3);
OUT_BATCH(MI_LOAD_REGISTER_IMM | (3 - 2));
OUT_BATCH(GEN7_SO_WRITE_OFFSET(i));
OUT_BATCH(0);
ADVANCE_BATCH();
}
}
brw_obj->primitive_mode = mode;
}
void
gen7_end_transform_feedback(struct gl_context *ctx,
struct gl_transform_feedback_object *obj)
{
/* After EndTransformFeedback, it's likely that the client program will try
* to draw using the contents of the transform feedback buffer as vertex
* input. In order for this to work, we need to flush the data through at
* least the GS stage of the pipeline, and flush out the render cache. For
* simplicity, just do a full flush.
*/
struct brw_context *brw = brw_context(ctx);
struct brw_transform_feedback_object *brw_obj =
(struct brw_transform_feedback_object *) obj;
/* Store the ending value of the SO_NUM_PRIMS_WRITTEN counters. */
if (!obj->Paused)
brw_save_primitives_written_counters(brw, brw_obj);
/* EndTransformFeedback() means that we need to update the number of
* vertices written. Since it's only necessary if DrawTransformFeedback()
* is called and it means mapping a buffer object, we delay computing it
* until it's absolutely necessary to try and avoid stalls.
*/
brw_obj->vertices_written_valid = false;
}
void
gen7_pause_transform_feedback(struct gl_context *ctx,
struct gl_transform_feedback_object *obj)
{
struct brw_context *brw = brw_context(ctx);
struct brw_transform_feedback_object *brw_obj =
(struct brw_transform_feedback_object *) obj;
const struct gen_device_info *devinfo = &brw->screen->devinfo;
/* Flush any drawing so that the counters have the right values. */
brw_emit_mi_flush(brw);
assert(devinfo->gen == 7);
/* Save the SOL buffer offset register values. */
for (int i = 0; i < 4; i++) {
BEGIN_BATCH(3);
OUT_BATCH(MI_STORE_REGISTER_MEM | (3 - 2));
OUT_BATCH(GEN7_SO_WRITE_OFFSET(i));
OUT_RELOC(brw_obj->offset_bo, RELOC_WRITE, i * sizeof(uint32_t));
ADVANCE_BATCH();
}
/* Store the temporary ending value of the SO_NUM_PRIMS_WRITTEN counters.
* While this operation is paused, other transform feedback actions may
* occur, which will contribute to the counters. We need to exclude that
* from our counts.
*/
brw_save_primitives_written_counters(brw, brw_obj);
}
void
gen7_resume_transform_feedback(struct gl_context *ctx,
struct gl_transform_feedback_object *obj)
{
struct brw_context *brw = brw_context(ctx);
struct brw_transform_feedback_object *brw_obj =
(struct brw_transform_feedback_object *) obj;
const struct gen_device_info *devinfo = &brw->screen->devinfo;
assert(devinfo->gen == 7);
/* Reload the SOL buffer offset registers. */
for (int i = 0; i < 4; i++) {
BEGIN_BATCH(3);
OUT_BATCH(GEN7_MI_LOAD_REGISTER_MEM | (3 - 2));
OUT_BATCH(GEN7_SO_WRITE_OFFSET(i));
OUT_RELOC(brw_obj->offset_bo, RELOC_WRITE, i * sizeof(uint32_t));
ADVANCE_BATCH();
}
/* Store the new starting value of the SO_NUM_PRIMS_WRITTEN counters. */
brw_save_primitives_written_counters(brw, brw_obj);
}
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