1 /* 2 * Copyright 2008 Corbin Simpson <MostAwesomeDude (at) gmail.com> 3 * Copyright 2009 Marek Olk <maraeo (at) gmail.com> 4 * 5 * Permission is hereby granted, free of charge, to any person obtaining a 6 * copy of this software and associated documentation files (the "Software"), 7 * to deal in the Software without restriction, including without limitation 8 * on the rights to use, copy, modify, merge, publish, distribute, sub 9 * license, and/or sell copies of the Software, and to permit persons to whom 10 * the Software is furnished to do so, subject to the following conditions: 11 * 12 * The above copyright notice and this permission notice (including the next 13 * paragraph) shall be included in all copies or substantial portions of the 14 * Software. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL 19 * THE AUTHOR(S) AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM, 20 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR 21 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE 22 * USE OR OTHER DEALINGS IN THE SOFTWARE. */ 23 24 #include "r300_context.h" 25 #include "r300_reg.h" 26 #include "r300_fs.h" 27 28 #include "util/u_format.h" 29 30 /* 31 HiZ rules - taken from various docs 32 1. HiZ only works on depth values 33 2. Cannot HiZ if stencil fail or zfail is !KEEP 34 3. on R300/400, HiZ is disabled if depth test is EQUAL 35 4. comparison changes without clears usually mean disabling HiZ 36 */ 37 /*****************************************************************************/ 38 /* The HyperZ setup */ 39 /*****************************************************************************/ 40 41 static enum r300_hiz_func r300_get_hiz_func(struct r300_context *r300) 42 { 43 struct r300_dsa_state *dsa = r300->dsa_state.state; 44 45 switch (dsa->dsa.depth.func) { 46 case PIPE_FUNC_NEVER: 47 case PIPE_FUNC_EQUAL: 48 case PIPE_FUNC_NOTEQUAL: 49 case PIPE_FUNC_ALWAYS: 50 default: 51 /* Guess MAX for uncertain cases. */ 52 case PIPE_FUNC_LESS: 53 case PIPE_FUNC_LEQUAL: 54 return HIZ_FUNC_MAX; 55 56 case PIPE_FUNC_GREATER: 57 case PIPE_FUNC_GEQUAL: 58 return HIZ_FUNC_MIN; 59 } 60 } 61 62 /* Return what's used for the depth test (either minimum or maximum). */ 63 static unsigned r300_get_sc_hz_max(struct r300_context *r300) 64 { 65 struct r300_dsa_state *dsa = r300->dsa_state.state; 66 unsigned func = dsa->dsa.depth.func; 67 68 return func >= PIPE_FUNC_GREATER ? R300_SC_HYPERZ_MAX : R300_SC_HYPERZ_MIN; 69 } 70 71 static boolean r300_is_hiz_func_valid(struct r300_context *r300) 72 { 73 struct r300_dsa_state *dsa = r300->dsa_state.state; 74 unsigned func = dsa->dsa.depth.func; 75 76 if (r300->hiz_func == HIZ_FUNC_NONE) 77 return TRUE; 78 79 /* func1 is less/lessthan */ 80 if (r300->hiz_func == HIZ_FUNC_MAX && 81 (func == PIPE_FUNC_GEQUAL || func == PIPE_FUNC_GREATER)) 82 return FALSE; 83 84 /* func1 is greater/greaterthan */ 85 if (r300->hiz_func == HIZ_FUNC_MIN && 86 (func == PIPE_FUNC_LESS || func == PIPE_FUNC_LEQUAL)) 87 return FALSE; 88 89 return TRUE; 90 } 91 92 static boolean r300_dsa_stencil_op_not_keep(struct pipe_stencil_state *s) 93 { 94 return s->enabled && (s->fail_op != PIPE_STENCIL_OP_KEEP || 95 s->zfail_op != PIPE_STENCIL_OP_KEEP); 96 } 97 98 static boolean r300_hiz_allowed(struct r300_context *r300) 99 { 100 struct r300_dsa_state *dsa = r300->dsa_state.state; 101 struct r300_screen *r300screen = r300->screen; 102 103 if (r300_fragment_shader_writes_depth(r300_fs(r300))) 104 return FALSE; 105 106 if (r300->query_current) 107 return FALSE; 108 109 /* If the depth function is inverted, HiZ must be disabled. */ 110 if (!r300_is_hiz_func_valid(r300)) 111 return FALSE; 112 113 /* if stencil fail/zfail op is not KEEP */ 114 if (r300_dsa_stencil_op_not_keep(&dsa->dsa.stencil[0]) || 115 r300_dsa_stencil_op_not_keep(&dsa->dsa.stencil[1])) 116 return FALSE; 117 118 if (dsa->dsa.depth.enabled) { 119 /* if depth func is EQUAL pre-r500 */ 120 if (dsa->dsa.depth.func == PIPE_FUNC_EQUAL && !r300screen->caps.is_r500) 121 return FALSE; 122 123 /* if depth func is NOTEQUAL */ 124 if (dsa->dsa.depth.func == PIPE_FUNC_NOTEQUAL) 125 return FALSE; 126 } 127 return TRUE; 128 } 129 130 static void r300_update_hyperz(struct r300_context* r300) 131 { 132 struct r300_hyperz_state *z = 133 (struct r300_hyperz_state*)r300->hyperz_state.state; 134 struct pipe_framebuffer_state *fb = 135 (struct pipe_framebuffer_state*)r300->fb_state.state; 136 struct r300_dsa_state *dsa = r300->dsa_state.state; 137 struct r300_resource *zstex = 138 fb->zsbuf ? r300_resource(fb->zsbuf->texture) : NULL; 139 140 z->gb_z_peq_config = 0; 141 z->zb_bw_cntl = 0; 142 z->sc_hyperz = R300_SC_HYPERZ_ADJ_2; 143 z->flush = 0; 144 145 if (r300->cbzb_clear) { 146 z->zb_bw_cntl |= R300_ZB_CB_CLEAR_CACHE_LINE_WRITE_ONLY; 147 return; 148 } 149 150 if (!zstex || !r300->hyperz_enabled) 151 return; 152 153 /* Set the size of ZMASK tiles. */ 154 if (zstex->tex.zcomp8x8[fb->zsbuf->u.tex.level]) { 155 z->gb_z_peq_config |= R300_GB_Z_PEQ_CONFIG_Z_PEQ_SIZE_8_8; 156 } 157 158 /* R500-specific features and optimizations. */ 159 if (r300->screen->caps.is_r500) { 160 z->zb_bw_cntl |= R500_PEQ_PACKING_ENABLE | 161 R500_COVERED_PTR_MASKING_ENABLE; 162 } 163 164 /* Setup decompression if needed. No other HyperZ setting is required. */ 165 if (r300->zmask_decompress) { 166 z->zb_bw_cntl |= R300_FAST_FILL_ENABLE | 167 R300_RD_COMP_ENABLE; 168 return; 169 } 170 171 /* Do not set anything if depth and stencil tests are off. */ 172 if (!dsa->dsa.depth.enabled && 173 !dsa->dsa.stencil[0].enabled && 174 !dsa->dsa.stencil[1].enabled) { 175 assert(!dsa->dsa.depth.writemask); 176 return; 177 } 178 179 /* Zbuffer compression. */ 180 if (r300->zmask_in_use && !r300->locked_zbuffer) { 181 z->zb_bw_cntl |= R300_FAST_FILL_ENABLE | 182 R300_RD_COMP_ENABLE | 183 R300_WR_COMP_ENABLE; 184 } 185 186 /* HiZ. */ 187 if (r300->hiz_in_use && !r300->locked_zbuffer) { 188 /* HiZ cannot be used under some circumstances. */ 189 if (!r300_hiz_allowed(r300)) { 190 /* If writemask is disabled, the HiZ memory will not be changed, 191 * so we can keep its content for later. */ 192 if (dsa->dsa.depth.writemask) { 193 r300->hiz_in_use = FALSE; 194 } 195 return; 196 } 197 DBG(r300, DBG_HYPERZ, "r300: Z-func: %i\n", dsa->dsa.depth.func); 198 199 /* Set the HiZ function if needed. */ 200 if (r300->hiz_func == HIZ_FUNC_NONE) { 201 r300->hiz_func = r300_get_hiz_func(r300); 202 } 203 204 /* Setup the HiZ bits. */ 205 z->zb_bw_cntl |= R300_HIZ_ENABLE | 206 (r300->hiz_func == HIZ_FUNC_MIN ? R300_HIZ_MIN : R300_HIZ_MAX); 207 208 z->sc_hyperz |= R300_SC_HYPERZ_ENABLE | 209 r300_get_sc_hz_max(r300); 210 211 if (r300->screen->caps.is_r500) { 212 z->zb_bw_cntl |= R500_HIZ_EQUAL_REJECT_ENABLE; 213 } 214 } 215 } 216 217 /*****************************************************************************/ 218 /* The ZTOP state */ 219 /*****************************************************************************/ 220 221 static boolean r300_dsa_writes_stencil( 222 struct pipe_stencil_state *s) 223 { 224 return s->enabled && s->writemask && 225 (s->fail_op != PIPE_STENCIL_OP_KEEP || 226 s->zfail_op != PIPE_STENCIL_OP_KEEP || 227 s->zpass_op != PIPE_STENCIL_OP_KEEP); 228 } 229 230 static boolean r300_dsa_writes_depth_stencil( 231 struct pipe_depth_stencil_alpha_state *dsa) 232 { 233 /* We are interested only in the cases when a depth or stencil value 234 * can be changed. */ 235 236 if (dsa->depth.enabled && dsa->depth.writemask && 237 dsa->depth.func != PIPE_FUNC_NEVER) 238 return TRUE; 239 240 if (r300_dsa_writes_stencil(&dsa->stencil[0]) || 241 r300_dsa_writes_stencil(&dsa->stencil[1])) 242 return TRUE; 243 244 return FALSE; 245 } 246 247 static boolean r300_dsa_alpha_test_enabled( 248 struct pipe_depth_stencil_alpha_state *dsa) 249 { 250 /* We are interested only in the cases when alpha testing can kill 251 * a fragment. */ 252 253 return dsa->alpha.enabled && dsa->alpha.func != PIPE_FUNC_ALWAYS; 254 } 255 256 static void r300_update_ztop(struct r300_context* r300) 257 { 258 struct r300_ztop_state* ztop_state = 259 (struct r300_ztop_state*)r300->ztop_state.state; 260 uint32_t old_ztop = ztop_state->z_buffer_top; 261 262 /* This is important enough that I felt it warranted a comment. 263 * 264 * According to the docs, these are the conditions where ZTOP must be 265 * disabled: 266 * 1) Alpha testing enabled 267 * 2) Texture kill instructions in fragment shader 268 * 3) Chroma key culling enabled 269 * 4) W-buffering enabled 270 * 271 * The docs claim that for the first three cases, if no ZS writes happen, 272 * then ZTOP can be used. 273 * 274 * (3) will never apply since we do not support chroma-keyed operations. 275 * (4) will need to be re-examined (and this comment updated) if/when 276 * Hyper-Z becomes supported. 277 * 278 * Additionally, the following conditions require disabled ZTOP: 279 * 5) Depth writes in fragment shader 280 * 6) Outstanding occlusion queries 281 * 282 * This register causes stalls all the way from SC to CB when changed, 283 * but it is buffered on-chip so it does not hurt to write it if it has 284 * not changed. 285 * 286 * ~C. 287 */ 288 289 /* ZS writes */ 290 if (r300_dsa_writes_depth_stencil(r300->dsa_state.state) && 291 (r300_dsa_alpha_test_enabled(r300->dsa_state.state) || /* (1) */ 292 r300_fs(r300)->shader->info.uses_kill)) { /* (2) */ 293 ztop_state->z_buffer_top = R300_ZTOP_DISABLE; 294 } else if (r300_fragment_shader_writes_depth(r300_fs(r300))) { /* (5) */ 295 ztop_state->z_buffer_top = R300_ZTOP_DISABLE; 296 } else if (r300->query_current) { /* (6) */ 297 ztop_state->z_buffer_top = R300_ZTOP_DISABLE; 298 } else { 299 ztop_state->z_buffer_top = R300_ZTOP_ENABLE; 300 } 301 if (ztop_state->z_buffer_top != old_ztop) 302 r300_mark_atom_dirty(r300, &r300->ztop_state); 303 } 304 305 void r300_update_hyperz_state(struct r300_context* r300) 306 { 307 r300_update_ztop(r300); 308 309 if (r300->hyperz_state.dirty) { 310 r300_update_hyperz(r300); 311 } 312 } 313
