/* * 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_context.h" #include "r300_reg.h" #include "r300_fs.h" #include "util/u_format.h" /* HiZ rules - taken from various docs 1. HiZ only works on depth values 2. Cannot HiZ if stencil fail or zfail is !KEEP 3. on R300/400, HiZ is disabled if depth test is EQUAL 4. comparison changes without clears usually mean disabling HiZ */ /*****************************************************************************/ /* The HyperZ setup */ /*****************************************************************************/ static enum r300_hiz_func r300_get_hiz_func(struct r300_context *r300) { struct r300_dsa_state *dsa = r300->dsa_state.state; switch (dsa->dsa.depth.func) { case PIPE_FUNC_NEVER: case PIPE_FUNC_EQUAL: case PIPE_FUNC_NOTEQUAL: case PIPE_FUNC_ALWAYS: default: /* Guess MAX for uncertain cases. */ case PIPE_FUNC_LESS: case PIPE_FUNC_LEQUAL: return HIZ_FUNC_MAX; case PIPE_FUNC_GREATER: case PIPE_FUNC_GEQUAL: return HIZ_FUNC_MIN; } } /* Return what's used for the depth test (either minimum or maximum). */ static unsigned r300_get_sc_hz_max(struct r300_context *r300) { struct r300_dsa_state *dsa = r300->dsa_state.state; unsigned func = dsa->dsa.depth.func; return func >= PIPE_FUNC_GREATER ? R300_SC_HYPERZ_MAX : R300_SC_HYPERZ_MIN; } static boolean r300_is_hiz_func_valid(struct r300_context *r300) { struct r300_dsa_state *dsa = r300->dsa_state.state; unsigned func = dsa->dsa.depth.func; if (r300->hiz_func == HIZ_FUNC_NONE) return TRUE; /* func1 is less/lessthan */ if (r300->hiz_func == HIZ_FUNC_MAX && (func == PIPE_FUNC_GEQUAL || func == PIPE_FUNC_GREATER)) return FALSE; /* func1 is greater/greaterthan */ if (r300->hiz_func == HIZ_FUNC_MIN && (func == PIPE_FUNC_LESS || func == PIPE_FUNC_LEQUAL)) return FALSE; return TRUE; } static boolean r300_dsa_stencil_op_not_keep(struct pipe_stencil_state *s) { return s->enabled && (s->fail_op != PIPE_STENCIL_OP_KEEP || s->zfail_op != PIPE_STENCIL_OP_KEEP); } static boolean r300_hiz_allowed(struct r300_context *r300) { struct r300_dsa_state *dsa = r300->dsa_state.state; struct r300_screen *r300screen = r300->screen; if (r300_fragment_shader_writes_depth(r300_fs(r300))) return FALSE; if (r300->query_current) return FALSE; /* If the depth function is inverted, HiZ must be disabled. */ if (!r300_is_hiz_func_valid(r300)) return FALSE; /* if stencil fail/zfail op is not KEEP */ if (r300_dsa_stencil_op_not_keep(&dsa->dsa.stencil[0]) || r300_dsa_stencil_op_not_keep(&dsa->dsa.stencil[1])) return FALSE; if (dsa->dsa.depth.enabled) { /* if depth func is EQUAL pre-r500 */ if (dsa->dsa.depth.func == PIPE_FUNC_EQUAL && !r300screen->caps.is_r500) return FALSE; /* if depth func is NOTEQUAL */ if (dsa->dsa.depth.func == PIPE_FUNC_NOTEQUAL) return FALSE; } return TRUE; } static void r300_update_hyperz(struct r300_context* r300) { struct r300_hyperz_state *z = (struct r300_hyperz_state*)r300->hyperz_state.state; struct pipe_framebuffer_state *fb = (struct pipe_framebuffer_state*)r300->fb_state.state; struct r300_dsa_state *dsa = r300->dsa_state.state; struct r300_resource *zstex = fb->zsbuf ? r300_resource(fb->zsbuf->texture) : NULL; z->gb_z_peq_config = 0; z->zb_bw_cntl = 0; z->sc_hyperz = R300_SC_HYPERZ_ADJ_2; z->flush = 0; if (r300->cbzb_clear) { z->zb_bw_cntl |= R300_ZB_CB_CLEAR_CACHE_LINE_WRITE_ONLY; return; } if (!zstex || !r300->hyperz_enabled) return; /* Set the size of ZMASK tiles. */ if (zstex->tex.zcomp8x8[fb->zsbuf->u.tex.level]) { z->gb_z_peq_config |= R300_GB_Z_PEQ_CONFIG_Z_PEQ_SIZE_8_8; } /* R500-specific features and optimizations. */ if (r300->screen->caps.is_r500) { z->zb_bw_cntl |= R500_PEQ_PACKING_ENABLE | R500_COVERED_PTR_MASKING_ENABLE; } /* Setup decompression if needed. No other HyperZ setting is required. */ if (r300->zmask_decompress) { z->zb_bw_cntl |= R300_FAST_FILL_ENABLE | R300_RD_COMP_ENABLE; return; } /* Do not set anything if depth and stencil tests are off. */ if (!dsa->dsa.depth.enabled && !dsa->dsa.stencil[0].enabled && !dsa->dsa.stencil[1].enabled) { assert(!dsa->dsa.depth.writemask); return; } /* Zbuffer compression. */ if (r300->zmask_in_use && !r300->locked_zbuffer) { z->zb_bw_cntl |= R300_FAST_FILL_ENABLE | R300_RD_COMP_ENABLE | R300_WR_COMP_ENABLE; } /* HiZ. */ if (r300->hiz_in_use && !r300->locked_zbuffer) { /* HiZ cannot be used under some circumstances. */ if (!r300_hiz_allowed(r300)) { /* If writemask is disabled, the HiZ memory will not be changed, * so we can keep its content for later. */ if (dsa->dsa.depth.writemask) { r300->hiz_in_use = FALSE; } return; } DBG(r300, DBG_HYPERZ, "r300: Z-func: %i\n", dsa->dsa.depth.func); /* Set the HiZ function if needed. */ if (r300->hiz_func == HIZ_FUNC_NONE) { r300->hiz_func = r300_get_hiz_func(r300); } /* Setup the HiZ bits. */ z->zb_bw_cntl |= R300_HIZ_ENABLE | (r300->hiz_func == HIZ_FUNC_MIN ? R300_HIZ_MIN : R300_HIZ_MAX); z->sc_hyperz |= R300_SC_HYPERZ_ENABLE | r300_get_sc_hz_max(r300); if (r300->screen->caps.is_r500) { z->zb_bw_cntl |= R500_HIZ_EQUAL_REJECT_ENABLE; } } } /*****************************************************************************/ /* The ZTOP state */ /*****************************************************************************/ static boolean r300_dsa_writes_stencil( struct pipe_stencil_state *s) { return s->enabled && s->writemask && (s->fail_op != PIPE_STENCIL_OP_KEEP || s->zfail_op != PIPE_STENCIL_OP_KEEP || s->zpass_op != PIPE_STENCIL_OP_KEEP); } static boolean r300_dsa_writes_depth_stencil( struct pipe_depth_stencil_alpha_state *dsa) { /* We are interested only in the cases when a depth or stencil value * can be changed. */ if (dsa->depth.enabled && dsa->depth.writemask && dsa->depth.func != PIPE_FUNC_NEVER) return TRUE; if (r300_dsa_writes_stencil(&dsa->stencil[0]) || r300_dsa_writes_stencil(&dsa->stencil[1])) return TRUE; return FALSE; } static boolean r300_dsa_alpha_test_enabled( struct pipe_depth_stencil_alpha_state *dsa) { /* We are interested only in the cases when alpha testing can kill * a fragment. */ return dsa->alpha.enabled && dsa->alpha.func != PIPE_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; uint32_t old_ztop = ztop_state->z_buffer_top; /* 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; } if (ztop_state->z_buffer_top != old_ztop) r300_mark_atom_dirty(r300, &r300->ztop_state); } void r300_update_hyperz_state(struct r300_context* r300) { r300_update_ztop(r300); if (r300->hyperz_state.dirty) { r300_update_hyperz(r300); } }