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/**************************************************************************
*
* Copyright 2010 VMware, Inc.
* All Rights Reserved.
*
* 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, sub license, 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 NON-INFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS AND/OR ITS SUPPLIERS 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.
*
**************************************************************************/
/**
* Transform feedback functions.
*
* \author Brian Paul
* Marek Olšák
*/
#include "main/bufferobj.h"
#include "main/context.h"
#include "main/transformfeedback.h"
#include "st_cb_bufferobjects.h"
#include "st_cb_xformfb.h"
#include "st_context.h"
#include "pipe/p_context.h"
#include "util/u_draw.h"
#include "util/u_inlines.h"
#include "cso_cache/cso_context.h"
struct st_transform_feedback_object {
struct gl_transform_feedback_object base;
unsigned num_targets;
struct pipe_stream_output_target *targets[PIPE_MAX_SO_BUFFERS];
/* This encapsulates the count that can be used as a source for draw_vbo.
* It contains stream output targets from the last call of
* EndTransformFeedback for each stream. */
struct pipe_stream_output_target *draw_count[MAX_VERTEX_STREAMS];
};
static inline struct st_transform_feedback_object *
st_transform_feedback_object(struct gl_transform_feedback_object *obj)
{
return (struct st_transform_feedback_object *) obj;
}
static struct gl_transform_feedback_object *
st_new_transform_feedback(struct gl_context *ctx, GLuint name)
{
struct st_transform_feedback_object *obj;
obj = CALLOC_STRUCT(st_transform_feedback_object);
if (!obj)
return NULL;
_mesa_init_transform_feedback_object(&obj->base, name);
return &obj->base;
}
static void
st_delete_transform_feedback(struct gl_context *ctx,
struct gl_transform_feedback_object *obj)
{
struct st_transform_feedback_object *sobj =
st_transform_feedback_object(obj);
unsigned i;
for (i = 0; i < ARRAY_SIZE(sobj->draw_count); i++)
pipe_so_target_reference(&sobj->draw_count[i], NULL);
/* Unreference targets. */
for (i = 0; i < sobj->num_targets; i++) {
pipe_so_target_reference(&sobj->targets[i], NULL);
}
for (i = 0; i < ARRAY_SIZE(sobj->base.Buffers); i++) {
_mesa_reference_buffer_object(ctx, &sobj->base.Buffers[i], NULL);
}
free(obj);
}
/* XXX Do we really need the mode? */
static void
st_begin_transform_feedback(struct gl_context *ctx, GLenum mode,
struct gl_transform_feedback_object *obj)
{
struct st_context *st = st_context(ctx);
struct pipe_context *pipe = st->pipe;
struct st_transform_feedback_object *sobj =
st_transform_feedback_object(obj);
unsigned i, max_num_targets;
unsigned offsets[PIPE_MAX_SO_BUFFERS] = {0};
max_num_targets = MIN2(ARRAY_SIZE(sobj->base.Buffers),
ARRAY_SIZE(sobj->targets));
/* Convert the transform feedback state into the gallium representation. */
for (i = 0; i < max_num_targets; i++) {
struct st_buffer_object *bo = st_buffer_object(sobj->base.Buffers[i]);
if (bo && bo->buffer) {
unsigned stream =
obj->shader_program->LinkedTransformFeedback.Buffers[i].Stream;
/* Check whether we need to recreate the target. */
if (!sobj->targets[i] ||
sobj->targets[i] == sobj->draw_count[stream] ||
sobj->targets[i]->buffer != bo->buffer ||
sobj->targets[i]->buffer_offset != sobj->base.Offset[i] ||
sobj->targets[i]->buffer_size != sobj->base.Size[i]) {
/* Create a new target. */
struct pipe_stream_output_target *so_target =
pipe->create_stream_output_target(pipe, bo->buffer,
sobj->base.Offset[i],
sobj->base.Size[i]);
pipe_so_target_reference(&sobj->targets[i], NULL);
sobj->targets[i] = so_target;
}
sobj->num_targets = i+1;
} else {
pipe_so_target_reference(&sobj->targets[i], NULL);
}
}
/* Start writing at the beginning of each target. */
cso_set_stream_outputs(st->cso_context, sobj->num_targets,
sobj->targets, offsets);
}
static void
st_pause_transform_feedback(struct gl_context *ctx,
struct gl_transform_feedback_object *obj)
{
struct st_context *st = st_context(ctx);
cso_set_stream_outputs(st->cso_context, 0, NULL, NULL);
}
static void
st_resume_transform_feedback(struct gl_context *ctx,
struct gl_transform_feedback_object *obj)
{
struct st_context *st = st_context(ctx);
struct st_transform_feedback_object *sobj =
st_transform_feedback_object(obj);
unsigned offsets[PIPE_MAX_SO_BUFFERS];
unsigned i;
for (i = 0; i < PIPE_MAX_SO_BUFFERS; i++)
offsets[i] = (unsigned)-1;
cso_set_stream_outputs(st->cso_context, sobj->num_targets,
sobj->targets, offsets);
}
static void
st_end_transform_feedback(struct gl_context *ctx,
struct gl_transform_feedback_object *obj)
{
struct st_context *st = st_context(ctx);
struct st_transform_feedback_object *sobj =
st_transform_feedback_object(obj);
unsigned i;
cso_set_stream_outputs(st->cso_context, 0, NULL, NULL);
/* The next call to glDrawTransformFeedbackStream should use the vertex
* count from the last call to glEndTransformFeedback.
* Therefore, save the targets for each stream.
*
* NULL means the vertex counter is 0 (initial state).
*/
for (i = 0; i < ARRAY_SIZE(sobj->draw_count); i++)
pipe_so_target_reference(&sobj->draw_count[i], NULL);
for (i = 0; i < ARRAY_SIZE(sobj->targets); i++) {
unsigned stream =
obj->shader_program->LinkedTransformFeedback.Buffers[i].Stream;
/* Is it not bound or already set for this stream? */
if (!sobj->targets[i] || sobj->draw_count[stream])
continue;
pipe_so_target_reference(&sobj->draw_count[stream], sobj->targets[i]);
}
}
bool
st_transform_feedback_draw_init(struct gl_transform_feedback_object *obj,
unsigned stream, struct pipe_draw_info *out)
{
struct st_transform_feedback_object *sobj =
st_transform_feedback_object(obj);
out->count_from_stream_output = sobj->draw_count[stream];
return out->count_from_stream_output != NULL;
}
void
st_init_xformfb_functions(struct dd_function_table *functions)
{
functions->NewTransformFeedback = st_new_transform_feedback;
functions->DeleteTransformFeedback = st_delete_transform_feedback;
functions->BeginTransformFeedback = st_begin_transform_feedback;
functions->EndTransformFeedback = st_end_transform_feedback;
functions->PauseTransformFeedback = st_pause_transform_feedback;
functions->ResumeTransformFeedback = st_resume_transform_feedback;
}
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