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/*
* Copyright 2008 Corbin Simpson <MostAwesomeDude@gmail.com>
* Copyright 2009 Marek Olšák <maraeo@gmail.com>
*
* 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
* on 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 AUTHOR(S) AND/OR THEIR 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. */
#include "r300_hyperz.h"
#include "r300_context.h"
#include "r300_reg.h"
#include "r300_fs.h"
/*****************************************************************************/
/* The ZTOP state */
/*****************************************************************************/
static boolean r300_dsa_writes_depth_stencil(struct r300_dsa_state* dsa)
{
/* We are interested only in the cases when a new depth or stencil value
* can be written and changed. */
/* We might optionally check for [Z func: never] and inspect the stencil
* state in a similar fashion, but it's not terribly important. */
return (dsa->z_buffer_control & R300_Z_WRITE_ENABLE) ||
(dsa->stencil_ref_mask & R300_STENCILWRITEMASK_MASK) ||
((dsa->z_buffer_control & R500_STENCIL_REFMASK_FRONT_BACK) &&
(dsa->stencil_ref_bf & R300_STENCILWRITEMASK_MASK));
}
static boolean r300_dsa_alpha_test_enabled(struct r300_dsa_state* dsa)
{
/* We are interested only in the cases when alpha testing can kill
* a fragment. */
uint32_t af = dsa->alpha_function;
return (af & R300_FG_ALPHA_FUNC_ENABLE) &&
(af & R300_FG_ALPHA_FUNC_ALWAYS) != R300_FG_ALPHA_FUNC_ALWAYS;
}
static void r300_update_ztop(struct r300_context* r300)
{
struct r300_ztop_state* ztop_state =
(struct r300_ztop_state*)r300->ztop_state.state;
/* This is important enough that I felt it warranted a comment.
*
* According to the docs, these are the conditions where ZTOP must be
* disabled:
* 1) Alpha testing enabled
* 2) Texture kill instructions in fragment shader
* 3) Chroma key culling enabled
* 4) W-buffering enabled
*
* The docs claim that for the first three cases, if no ZS writes happen,
* then ZTOP can be used.
*
* (3) will never apply since we do not support chroma-keyed operations.
* (4) will need to be re-examined (and this comment updated) if/when
* Hyper-Z becomes supported.
*
* Additionally, the following conditions require disabled ZTOP:
* 5) Depth writes in fragment shader
* 6) Outstanding occlusion queries
*
* This register causes stalls all the way from SC to CB when changed,
* but it is buffered on-chip so it does not hurt to write it if it has
* not changed.
*
* ~C.
*/
/* ZS writes */
if (r300_dsa_writes_depth_stencil(r300->dsa_state.state) &&
(r300_dsa_alpha_test_enabled(r300->dsa_state.state) || /* (1) */
r300_fs(r300)->shader->info.uses_kill)) { /* (2) */
ztop_state->z_buffer_top = R300_ZTOP_DISABLE;
} else if (r300_fragment_shader_writes_depth(r300_fs(r300))) { /* (5) */
ztop_state->z_buffer_top = R300_ZTOP_DISABLE;
} else if (r300->query_current) { /* (6) */
ztop_state->z_buffer_top = R300_ZTOP_DISABLE;
} else {
ztop_state->z_buffer_top = R300_ZTOP_ENABLE;
}
r300->ztop_state.dirty = TRUE;
}
void r300_update_hyperz_state(struct r300_context* r300)
{
r300_update_ztop(r300);
}
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