From 20c96759940b0bbe5afdb592cda1c410bfa6e665 Mon Sep 17 00:00:00 2001 From: Marek Olšák Date: Sun, 18 Apr 2010 05:10:43 +0200 Subject: r300g: move ZTOP to separate file Ideally, HiZ should go in r300_hyperz.c next to ZTOP. --- src/gallium/drivers/r300/r300_hyperz.c | 108 +++++++++++++++++++++++++++++++++ 1 file changed, 108 insertions(+) create mode 100644 src/gallium/drivers/r300/r300_hyperz.c (limited to 'src/gallium/drivers/r300/r300_hyperz.c') diff --git a/src/gallium/drivers/r300/r300_hyperz.c b/src/gallium/drivers/r300/r300_hyperz.c new file mode 100644 index 0000000000..b41b6b1508 --- /dev/null +++ b/src/gallium/drivers/r300/r300_hyperz.c @@ -0,0 +1,108 @@ +/* + * Copyright 2008 Corbin Simpson + * Copyright 2009 Marek Olšák + * + * 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); +} -- cgit v1.2.3