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/*
* Copyright 2019 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.
*/
#include "isl/isl.h"
/* How writes with an isl_aux_usage behave. */
enum write_behavior {
/* Writes only touch the main surface. */
WRITES_ONLY_TOUCH_MAIN = 0,
/* Writes using the 3D engine are compressed. */
WRITES_COMPRESS,
/* Writes implicitly fully resolve the compression block and write the data
* uncompressed into the main surface. The resolved aux blocks are
* ambiguated and left in the pass-through state.
*/
WRITES_RESOLVE_AMBIGUATE,
};
/* A set of features supported by an isl_aux_usage. */
struct aux_usage_info {
/* How writes affect the surface(s) in use. */
enum write_behavior write_behavior;
/* Aux supports "real" compression beyond just fast-clears. */
bool compressed;
/* SW can perform ISL_AUX_OP_FAST_CLEAR. */
bool fast_clear;
/* SW can perform ISL_AUX_OP_PARTIAL_RESOLVE. */
bool partial_resolve;
/* Performing ISL_AUX_OP_FULL_RESOLVE includes ISL_AUX_OP_AMBIGUATE. */
bool full_resolves_ambiguate;
};
#define AUX(wb, c, fc, pr, fra, type) \
[ISL_AUX_USAGE_ ## type] = { WRITES_ ## wb, c, fc, pr, fra},
#define Y true
#define x false
static const struct aux_usage_info info[] = {
/* write_behavior c fc pr fra */
AUX( COMPRESS, Y, Y, x, x, HIZ)
AUX( COMPRESS, Y, Y, x, x, HIZ_CCS)
AUX( COMPRESS, Y, Y, Y, x, MCS)
AUX( COMPRESS, Y, Y, Y, x, MCS_CCS)
AUX( COMPRESS, Y, Y, Y, Y, CCS_E)
AUX(RESOLVE_AMBIGUATE, x, Y, x, Y, CCS_D)
AUX(RESOLVE_AMBIGUATE, Y, x, x, Y, MC)
};
#undef x
#undef Y
#undef AUX
ASSERTED static bool
aux_state_possible(enum isl_aux_state state,
enum isl_aux_usage usage)
{
switch (state) {
case ISL_AUX_STATE_CLEAR:
case ISL_AUX_STATE_PARTIAL_CLEAR:
return info[usage].fast_clear;
case ISL_AUX_STATE_COMPRESSED_CLEAR:
return info[usage].fast_clear && info[usage].compressed;
case ISL_AUX_STATE_COMPRESSED_NO_CLEAR:
return info[usage].compressed;
case ISL_AUX_STATE_RESOLVED:
case ISL_AUX_STATE_PASS_THROUGH:
case ISL_AUX_STATE_AUX_INVALID:
return true;
}
unreachable("Invalid aux state.");
}
enum isl_aux_op
isl_aux_prepare_access(enum isl_aux_state initial_state,
enum isl_aux_usage usage,
bool fast_clear_supported)
{
if (usage != ISL_AUX_USAGE_NONE) {
UNUSED const enum isl_aux_usage state_superset_usage =
usage == ISL_AUX_USAGE_CCS_D ? ISL_AUX_USAGE_CCS_E : usage;
assert(aux_state_possible(initial_state, state_superset_usage));
}
assert(!fast_clear_supported || info[usage].fast_clear);
switch (initial_state) {
case ISL_AUX_STATE_COMPRESSED_CLEAR:
if (!info[usage].compressed)
return ISL_AUX_OP_FULL_RESOLVE;
/* Fall-through */
case ISL_AUX_STATE_CLEAR:
case ISL_AUX_STATE_PARTIAL_CLEAR:
return fast_clear_supported ?
ISL_AUX_OP_NONE :
info[usage].partial_resolve ?
ISL_AUX_OP_PARTIAL_RESOLVE : ISL_AUX_OP_FULL_RESOLVE;
case ISL_AUX_STATE_COMPRESSED_NO_CLEAR:
return info[usage].compressed ?
ISL_AUX_OP_NONE : ISL_AUX_OP_FULL_RESOLVE;
case ISL_AUX_STATE_RESOLVED:
case ISL_AUX_STATE_PASS_THROUGH:
return ISL_AUX_OP_NONE;
case ISL_AUX_STATE_AUX_INVALID:
return info[usage].write_behavior == WRITES_ONLY_TOUCH_MAIN ?
ISL_AUX_OP_NONE : ISL_AUX_OP_AMBIGUATE;
}
unreachable("Invalid aux state.");
}
enum isl_aux_state
isl_aux_state_transition_aux_op(enum isl_aux_state initial_state,
enum isl_aux_usage usage,
enum isl_aux_op op)
{
assert(aux_state_possible(initial_state, usage));
assert(usage != ISL_AUX_USAGE_NONE || op == ISL_AUX_OP_NONE);
switch (op) {
case ISL_AUX_OP_NONE:
return initial_state;
case ISL_AUX_OP_FAST_CLEAR:
assert(info[usage].fast_clear);
return ISL_AUX_STATE_CLEAR;
case ISL_AUX_OP_PARTIAL_RESOLVE:
assert(isl_aux_state_has_valid_aux(initial_state));
assert(info[usage].partial_resolve);
return initial_state == ISL_AUX_STATE_CLEAR ||
initial_state == ISL_AUX_STATE_PARTIAL_CLEAR ||
initial_state == ISL_AUX_STATE_COMPRESSED_CLEAR ?
ISL_AUX_STATE_COMPRESSED_NO_CLEAR : initial_state;
case ISL_AUX_OP_FULL_RESOLVE:
assert(isl_aux_state_has_valid_aux(initial_state));
return info[usage].full_resolves_ambiguate ||
initial_state == ISL_AUX_STATE_PASS_THROUGH ?
ISL_AUX_STATE_PASS_THROUGH : ISL_AUX_STATE_RESOLVED;
case ISL_AUX_OP_AMBIGUATE:
return ISL_AUX_STATE_PASS_THROUGH;
}
unreachable("Invalid aux op.");
}
enum isl_aux_state
isl_aux_state_transition_write(enum isl_aux_state initial_state,
enum isl_aux_usage usage,
bool full_surface)
{
if (info[usage].write_behavior == WRITES_ONLY_TOUCH_MAIN) {
assert(full_surface || isl_aux_state_has_valid_primary(initial_state));
return initial_state == ISL_AUX_STATE_PASS_THROUGH ?
ISL_AUX_STATE_PASS_THROUGH : ISL_AUX_STATE_AUX_INVALID;
}
assert(isl_aux_state_has_valid_aux(initial_state));
assert(aux_state_possible(initial_state, usage));
assert(info[usage].write_behavior == WRITES_COMPRESS ||
info[usage].write_behavior == WRITES_RESOLVE_AMBIGUATE);
if (full_surface) {
return info[usage].write_behavior == WRITES_COMPRESS ?
ISL_AUX_STATE_COMPRESSED_NO_CLEAR : ISL_AUX_STATE_PASS_THROUGH;
}
switch (initial_state) {
case ISL_AUX_STATE_CLEAR:
case ISL_AUX_STATE_PARTIAL_CLEAR:
return info[usage].write_behavior == WRITES_COMPRESS ?
ISL_AUX_STATE_COMPRESSED_CLEAR : ISL_AUX_STATE_PARTIAL_CLEAR;
case ISL_AUX_STATE_RESOLVED:
case ISL_AUX_STATE_PASS_THROUGH:
return info[usage].write_behavior == WRITES_COMPRESS ?
ISL_AUX_STATE_COMPRESSED_NO_CLEAR : initial_state;
case ISL_AUX_STATE_COMPRESSED_CLEAR:
case ISL_AUX_STATE_COMPRESSED_NO_CLEAR:
case ISL_AUX_STATE_AUX_INVALID:
return initial_state;
}
unreachable("Invalid aux state.");
}
bool
isl_aux_usage_has_fast_clears(enum isl_aux_usage usage)
{
return info[usage].fast_clear;
}
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