/*
* 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 gen6_sol.c
*
* Code to initialize the binding table entries used by transform feedback.
*/
#include "main/bufferobj.h"
#include "main/macros.h"
#include "brw_context.h"
#include "intel_batchbuffer.h"
#include "brw_defines.h"
#include "brw_state.h"
#include "main/transformfeedback.h"
static void
gen6_update_sol_surfaces(struct brw_context *brw)
{
struct gl_context *ctx = &brw->ctx;
bool xfb_active = _mesa_is_xfb_active_and_unpaused(ctx);
struct gl_transform_feedback_object *xfb_obj;
const struct gl_transform_feedback_info *linked_xfb_info = NULL;
if (xfb_active) {
/* BRW_NEW_TRANSFORM_FEEDBACK */
xfb_obj = ctx->TransformFeedback.CurrentObject;
linked_xfb_info = xfb_obj->program->sh.LinkedTransformFeedback;
}
for (int i = 0; i < BRW_MAX_SOL_BINDINGS; ++i) {
const int surf_index = SURF_INDEX_GEN6_SOL_BINDING(i);
if (xfb_active && i < linked_xfb_info->NumOutputs) {
unsigned buffer = linked_xfb_info->Outputs[i].OutputBuffer;
unsigned buffer_offset =
xfb_obj->Offset[buffer] / 4 +
linked_xfb_info->Outputs[i].DstOffset;
if (brw->geometry_program) {
brw_update_sol_surface(
brw, xfb_obj->Buffers[buffer],
&brw->gs.base.surf_offset[surf_index],
linked_xfb_info->Outputs[i].NumComponents,
linked_xfb_info->Buffers[buffer].Stride, buffer_offset);
} else {
brw_update_sol_surface(
brw, xfb_obj->Buffers[buffer],
&brw->ff_gs.surf_offset[surf_index],
linked_xfb_info->Outputs[i].NumComponents,
linked_xfb_info->Buffers[buffer].Stride, buffer_offset);
}
} else {
if (!brw->geometry_program)
brw->ff_gs.surf_offset[surf_index] = 0;
else
brw->gs.base.surf_offset[surf_index] = 0;
}
}
brw->ctx.NewDriverState |= BRW_NEW_SURFACES;
}
const struct brw_tracked_state gen6_sol_surface = {
.dirty = {
.mesa = 0,
.brw = BRW_NEW_BATCH |
BRW_NEW_BLORP |
BRW_NEW_TRANSFORM_FEEDBACK,
},
.emit = gen6_update_sol_surfaces,
};
/**
* Constructs the binding table for the WM surface state, which maps unit
* numbers to surface state objects.
*/
static void
brw_gs_upload_binding_table(struct brw_context *brw)
{
uint32_t *bind;
struct gl_context *ctx = &brw->ctx;
const struct gl_shader_program *shaderprog;
bool need_binding_table = false;
/* We have two scenarios here:
* 1) We are using a geometry shader only to implement transform feedback
* for a vertex shader (brw->geometry_program == NULL). In this case, we
* only need surfaces for transform feedback in the GS stage.
* 2) We have a user-provided geometry shader. In this case we may need
* surfaces for transform feedback and/or other stuff, like textures,
* in the GS stage.
*/
if (!brw->geometry_program) {
/* BRW_NEW_VERTEX_PROGRAM */
shaderprog = ctx->_Shader->CurrentProgram[MESA_SHADER_VERTEX];
if (shaderprog) {
/* Skip making a binding table if we don't have anything to put in it */
const struct gl_transform_feedback_info *linked_xfb_info =
shaderprog->xfb_program->sh.LinkedTransformFeedback;
need_binding_table = linked_xfb_info->NumOutputs > 0;
}
if (!need_binding_table) {
if (brw->ff_gs.bind_bo_offset != 0) {
brw->ctx.NewDriverState |= BRW_NEW_BINDING_TABLE_POINTERS;
brw->ff_gs.bind_bo_offset = 0;
}
return;
}
/* Might want to calculate nr_surfaces first, to avoid taking up so much
* space for the binding table. Anyway, in this case we know that we only
* use BRW_MAX_SOL_BINDINGS surfaces at most.
*/
bind = brw_state_batch(brw, AUB_TRACE_BINDING_TABLE,
sizeof(uint32_t) * BRW_MAX_SOL_BINDINGS,
32, &brw->ff_gs.bind_bo_offset);
/* BRW_NEW_SURFACES */
memcpy(bind, brw->ff_gs.surf_offset,
BRW_MAX_SOL_BINDINGS * sizeof(uint32_t));
} else {
/* BRW_NEW_GEOMETRY_PROGRAM */
shaderprog = ctx->_Shader->CurrentProgram[MESA_SHADER_GEOMETRY];
if (shaderprog) {
/* Skip making a binding table if we don't have anything to put in it */
struct brw_stage_prog_data *prog_data = brw->gs.base.prog_data;
const struct gl_transform_feedback_info *linked_xfb_info =
shaderprog->xfb_program->sh.LinkedTransformFeedback;
need_binding_table = linked_xfb_info->NumOutputs > 0 ||
prog_data->binding_table.size_bytes > 0;
}
if (!need_binding_table) {
if (brw->gs.base.bind_bo_offset != 0) {
brw->gs.base.bind_bo_offset = 0;
brw->ctx.NewDriverState |= BRW_NEW_BINDING_TABLE_POINTERS;
}
return;
}
/* Might want to calculate nr_surfaces first, to avoid taking up so much
* space for the binding table.
*/
bind = brw_state_batch(brw, AUB_TRACE_BINDING_TABLE,
sizeof(uint32_t) * BRW_MAX_SURFACES,
32, &brw->gs.base.bind_bo_offset);
/* BRW_NEW_SURFACES */
memcpy(bind, brw->gs.base.surf_offset,
BRW_MAX_SURFACES * sizeof(uint32_t));
}
brw->ctx.NewDriverState |= BRW_NEW_BINDING_TABLE_POINTERS;
}
const struct brw_tracked_state gen6_gs_binding_table = {
.dirty = {
.mesa = 0,
.brw = BRW_NEW_BATCH |
BRW_NEW_BLORP |
BRW_NEW_GEOMETRY_PROGRAM |
BRW_NEW_VERTEX_PROGRAM |
BRW_NEW_SURFACES,
},
.emit = brw_gs_upload_binding_table,
};
struct gl_transform_feedback_object *
brw_new_transform_feedback(struct gl_context *ctx, GLuint name)
{
struct brw_context *brw = brw_context(ctx);
struct brw_transform_feedback_object *brw_obj =
CALLOC_STRUCT(brw_transform_feedback_object);
if (!brw_obj)
return NULL;
_mesa_init_transform_feedback_object(&brw_obj->base, name);
brw_obj->offset_bo =
drm_intel_bo_alloc(brw->bufmgr, "transform feedback offsets", 16, 64);
brw_obj->prim_count_bo =
drm_intel_bo_alloc(brw->bufmgr, "xfb primitive counts", 4096, 64);
return &brw_obj->base;
}
void
brw_delete_transform_feedback(struct gl_context *ctx,
struct gl_transform_feedback_object *obj)
{
struct brw_transform_feedback_object *brw_obj =
(struct brw_transform_feedback_object *) obj;
for (unsigned i = 0; i < ARRAY_SIZE(obj->Buffers); i++) {
_mesa_reference_buffer_object(ctx, &obj->Buffers[i], NULL);
}
drm_intel_bo_unreference(brw_obj->offset_bo);
drm_intel_bo_unreference(brw_obj->prim_count_bo);
free(brw_obj);
}
void
brw_begin_transform_feedback(struct gl_context *ctx, GLenum mode,
struct gl_transform_feedback_object *obj)
{
struct brw_context *brw = brw_context(ctx);
const struct gl_shader_program *shaderprog;
const struct gl_transform_feedback_info *linked_xfb_info;
struct gl_transform_feedback_object *xfb_obj =
ctx->TransformFeedback.CurrentObject;
assert(brw->gen == 6);
if (ctx->_Shader->CurrentProgram[MESA_SHADER_GEOMETRY]) {
/* BRW_NEW_GEOMETRY_PROGRAM */
shaderprog =
ctx->_Shader->CurrentProgram[MESA_SHADER_GEOMETRY];
} else {
/* BRW_NEW_VERTEX_PROGRAM */
shaderprog =
ctx->_Shader->CurrentProgram[MESA_SHADER_VERTEX];
}
linked_xfb_info = shaderprog->xfb_program->sh.LinkedTransformFeedback;
/* Compute the maximum number of vertices that we can write without
* overflowing any of the buffers currently being used for feedback.
*/
unsigned max_index
= _mesa_compute_max_transform_feedback_vertices(ctx, xfb_obj,
linked_xfb_info);
/* Initialize the SVBI 0 register to zero and set the maximum index. */
BEGIN_BATCH(4);
OUT_BATCH(_3DSTATE_GS_SVB_INDEX << 16 | (4 - 2));
OUT_BATCH(0); /* SVBI 0 */
OUT_BATCH(0); /* starting index */
OUT_BATCH(max_index);
ADVANCE_BATCH();
/* Initialize the rest of the unused streams to sane values. Otherwise,
* they may indicate that there is no room to write data and prevent
* anything from happening at all.
*/
for (int i = 1; i < 4; i++) {
BEGIN_BATCH(4);
OUT_BATCH(_3DSTATE_GS_SVB_INDEX << 16 | (4 - 2));
OUT_BATCH(i << SVB_INDEX_SHIFT);
OUT_BATCH(0); /* starting index */
OUT_BATCH(0xffffffff);
ADVANCE_BATCH();
}
}
void
brw_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);
brw_emit_mi_flush(brw);
}