José Fonseca | 343ccc8 | 2009-08-21 07:43:49 +0100 | [diff] [blame] | 1 | /************************************************************************** |
| 2 | * |
| 3 | * Copyright 2009 VMware, Inc. |
| 4 | * All Rights Reserved. |
| 5 | * |
| 6 | * Permission is hereby granted, free of charge, to any person obtaining a |
| 7 | * copy of this software and associated documentation files (the |
| 8 | * "Software"), to deal in the Software without restriction, including |
| 9 | * without limitation the rights to use, copy, modify, merge, publish, |
| 10 | * distribute, sub license, and/or sell copies of the Software, and to |
| 11 | * permit persons to whom the Software is furnished to do so, subject to |
| 12 | * the following conditions: |
| 13 | * |
| 14 | * The above copyright notice and this permission notice (including the |
| 15 | * next paragraph) shall be included in all copies or substantial portions |
| 16 | * of the Software. |
| 17 | * |
| 18 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS |
| 19 | * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
| 20 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. |
| 21 | * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR |
| 22 | * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, |
| 23 | * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE |
| 24 | * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
| 25 | * |
| 26 | **************************************************************************/ |
| 27 | |
| 28 | /** |
José Fonseca | 5811ed8 | 2009-08-22 22:26:55 +0100 | [diff] [blame] | 29 | * @file |
José Fonseca | 343ccc8 | 2009-08-21 07:43:49 +0100 | [diff] [blame] | 30 | * Depth/stencil testing to LLVM IR translation. |
| 31 | * |
José Fonseca | 5811ed8 | 2009-08-22 22:26:55 +0100 | [diff] [blame] | 32 | * To be done accurately/efficiently the depth/stencil test must be done with |
| 33 | * the same type/format of the depth/stencil buffer, which implies massaging |
| 34 | * the incoming depths to fit into place. Using a more straightforward |
| 35 | * type/format for depth/stencil values internally and only convert when |
| 36 | * flushing would avoid this, but it would most likely result in depth fighting |
| 37 | * artifacts. |
| 38 | * |
| 39 | * We are free to use a different pixel layout though. Since our basic |
| 40 | * processing unit is a quad (2x2 pixel block) we store the depth/stencil |
| 41 | * values tiled, a quad at time. That is, a depth buffer containing |
| 42 | * |
| 43 | * Z11 Z12 Z13 Z14 ... |
| 44 | * Z21 Z22 Z23 Z24 ... |
| 45 | * Z31 Z32 Z33 Z34 ... |
| 46 | * Z41 Z42 Z43 Z44 ... |
| 47 | * ... ... ... ... ... |
| 48 | * |
| 49 | * will actually be stored in memory as |
| 50 | * |
| 51 | * Z11 Z12 Z21 Z22 Z13 Z14 Z23 Z24 ... |
| 52 | * Z31 Z32 Z41 Z42 Z33 Z34 Z43 Z44 ... |
| 53 | * ... ... ... ... ... ... ... ... ... |
| 54 | * |
| 55 | * FIXME: Code generate stencil test |
| 56 | * |
José Fonseca | 343ccc8 | 2009-08-21 07:43:49 +0100 | [diff] [blame] | 57 | * @author Jose Fonseca <jfonseca@vmware.com> |
| 58 | */ |
| 59 | |
| 60 | #include "pipe/p_state.h" |
| 61 | #include "util/u_format.h" |
| 62 | |
| 63 | #include "lp_bld_type.h" |
| 64 | #include "lp_bld_const.h" |
| 65 | #include "lp_bld_logic.h" |
José Fonseca | 3d7a886 | 2009-08-21 13:49:10 +0100 | [diff] [blame] | 66 | #include "lp_bld_flow.h" |
José Fonseca | 343ccc8 | 2009-08-21 07:43:49 +0100 | [diff] [blame] | 67 | #include "lp_bld_debug.h" |
| 68 | #include "lp_bld_depth.h" |
| 69 | |
| 70 | |
José Fonseca | 5811ed8 | 2009-08-22 22:26:55 +0100 | [diff] [blame] | 71 | /** |
| 72 | * Return a type appropriate for depth/stencil testing. |
| 73 | */ |
José Fonseca | b4835ea | 2009-09-14 11:05:06 +0100 | [diff] [blame] | 74 | struct lp_type |
José Fonseca | 343ccc8 | 2009-08-21 07:43:49 +0100 | [diff] [blame] | 75 | lp_depth_type(const struct util_format_description *format_desc, |
| 76 | unsigned length) |
| 77 | { |
José Fonseca | b4835ea | 2009-09-14 11:05:06 +0100 | [diff] [blame] | 78 | struct lp_type type; |
José Fonseca | 343ccc8 | 2009-08-21 07:43:49 +0100 | [diff] [blame] | 79 | unsigned swizzle; |
| 80 | |
| 81 | assert(format_desc->colorspace == UTIL_FORMAT_COLORSPACE_ZS); |
| 82 | assert(format_desc->block.width == 1); |
| 83 | assert(format_desc->block.height == 1); |
| 84 | |
| 85 | swizzle = format_desc->swizzle[0]; |
| 86 | assert(swizzle < 4); |
| 87 | |
José Fonseca | b4835ea | 2009-09-14 11:05:06 +0100 | [diff] [blame] | 88 | memset(&type, 0, sizeof type); |
José Fonseca | 343ccc8 | 2009-08-21 07:43:49 +0100 | [diff] [blame] | 89 | type.width = format_desc->block.bits; |
| 90 | |
| 91 | if(format_desc->channel[swizzle].type == UTIL_FORMAT_TYPE_FLOAT) { |
| 92 | type.floating = TRUE; |
José Fonseca | 52df532 | 2009-11-10 16:55:44 -0800 | [diff] [blame] | 93 | assert(swizzle == 0); |
José Fonseca | 343ccc8 | 2009-08-21 07:43:49 +0100 | [diff] [blame] | 94 | assert(format_desc->channel[swizzle].size == format_desc->block.bits); |
| 95 | } |
| 96 | else if(format_desc->channel[swizzle].type == UTIL_FORMAT_TYPE_UNSIGNED) { |
| 97 | assert(format_desc->block.bits <= 32); |
| 98 | if(format_desc->channel[swizzle].normalized) |
| 99 | type.norm = TRUE; |
| 100 | } |
| 101 | else |
| 102 | assert(0); |
| 103 | |
| 104 | assert(type.width <= length); |
| 105 | type.length = length / type.width; |
| 106 | |
| 107 | return type; |
| 108 | } |
| 109 | |
| 110 | |
José Fonseca | 5811ed8 | 2009-08-22 22:26:55 +0100 | [diff] [blame] | 111 | /** |
| 112 | * Depth test. |
| 113 | */ |
José Fonseca | 343ccc8 | 2009-08-21 07:43:49 +0100 | [diff] [blame] | 114 | void |
| 115 | lp_build_depth_test(LLVMBuilderRef builder, |
| 116 | const struct pipe_depth_state *state, |
José Fonseca | b4835ea | 2009-09-14 11:05:06 +0100 | [diff] [blame] | 117 | struct lp_type type, |
José Fonseca | 343ccc8 | 2009-08-21 07:43:49 +0100 | [diff] [blame] | 118 | const struct util_format_description *format_desc, |
José Fonseca | 3d7a886 | 2009-08-21 13:49:10 +0100 | [diff] [blame] | 119 | struct lp_build_mask_context *mask, |
José Fonseca | 343ccc8 | 2009-08-21 07:43:49 +0100 | [diff] [blame] | 120 | LLVMValueRef src, |
| 121 | LLVMValueRef dst_ptr) |
| 122 | { |
| 123 | struct lp_build_context bld; |
| 124 | unsigned z_swizzle; |
| 125 | LLVMValueRef dst; |
| 126 | LLVMValueRef z_bitmask = NULL; |
| 127 | LLVMValueRef test; |
| 128 | |
| 129 | if(!state->enabled) |
| 130 | return; |
| 131 | |
| 132 | assert(format_desc->colorspace == UTIL_FORMAT_COLORSPACE_ZS); |
| 133 | assert(format_desc->block.width == 1); |
| 134 | assert(format_desc->block.height == 1); |
| 135 | |
| 136 | z_swizzle = format_desc->swizzle[0]; |
| 137 | if(z_swizzle == UTIL_FORMAT_SWIZZLE_NONE) |
| 138 | return; |
| 139 | |
| 140 | /* Sanity checking */ |
| 141 | assert(z_swizzle < 4); |
| 142 | assert(format_desc->block.bits == type.width); |
| 143 | if(type.floating) { |
| 144 | assert(z_swizzle == 0); |
| 145 | assert(format_desc->channel[z_swizzle].type == UTIL_FORMAT_TYPE_FLOAT); |
| 146 | assert(format_desc->channel[z_swizzle].size == format_desc->block.bits); |
| 147 | } |
| 148 | else { |
| 149 | assert(format_desc->channel[z_swizzle].type == UTIL_FORMAT_TYPE_UNSIGNED); |
| 150 | assert(format_desc->channel[z_swizzle].normalized); |
| 151 | assert(!type.fixed); |
| 152 | assert(!type.sign); |
| 153 | assert(type.norm); |
| 154 | } |
| 155 | |
| 156 | /* Setup build context */ |
| 157 | lp_build_context_init(&bld, builder, type); |
| 158 | |
| 159 | dst = LLVMBuildLoad(builder, dst_ptr, ""); |
| 160 | |
| 161 | lp_build_name(dst, "zsbuf"); |
| 162 | |
| 163 | /* Align the source depth bits with the destination's, and mask out any |
| 164 | * stencil or padding bits from both */ |
| 165 | if(format_desc->channel[z_swizzle].size == format_desc->block.bits) { |
| 166 | assert(z_swizzle == 0); |
| 167 | /* nothing to do */ |
| 168 | } |
| 169 | else { |
| 170 | unsigned padding_left; |
| 171 | unsigned padding_right; |
| 172 | unsigned chan; |
| 173 | |
| 174 | assert(format_desc->layout == UTIL_FORMAT_LAYOUT_ARITH); |
| 175 | assert(format_desc->channel[z_swizzle].type == UTIL_FORMAT_TYPE_UNSIGNED); |
| 176 | assert(format_desc->channel[z_swizzle].size <= format_desc->block.bits); |
| 177 | assert(format_desc->channel[z_swizzle].normalized); |
| 178 | |
| 179 | padding_right = 0; |
| 180 | for(chan = 0; chan < z_swizzle; ++chan) |
| 181 | padding_right += format_desc->channel[chan].size; |
José Fonseca | abc160b | 2009-09-09 21:17:20 +0100 | [diff] [blame] | 182 | padding_left = format_desc->block.bits - |
| 183 | (padding_right + format_desc->channel[z_swizzle].size); |
José Fonseca | 343ccc8 | 2009-08-21 07:43:49 +0100 | [diff] [blame] | 184 | |
| 185 | if(padding_left || padding_right) { |
José Fonseca | abc160b | 2009-09-09 21:17:20 +0100 | [diff] [blame] | 186 | const unsigned long long mask_left = ((unsigned long long)1 << (format_desc->block.bits - padding_left)) - 1; |
| 187 | const unsigned long long mask_right = ((unsigned long long)1 << (padding_right)) - 1; |
| 188 | z_bitmask = lp_build_int_const_scalar(type, mask_left ^ mask_right); |
José Fonseca | 343ccc8 | 2009-08-21 07:43:49 +0100 | [diff] [blame] | 189 | } |
| 190 | |
| 191 | if(padding_left) |
José Fonseca | 77b35dc | 2009-08-22 22:30:03 +0100 | [diff] [blame] | 192 | src = LLVMBuildLShr(builder, src, lp_build_int_const_scalar(type, padding_left), ""); |
José Fonseca | 343ccc8 | 2009-08-21 07:43:49 +0100 | [diff] [blame] | 193 | if(padding_right) |
| 194 | src = LLVMBuildAnd(builder, src, z_bitmask, ""); |
| 195 | if(padding_left || padding_right) |
| 196 | dst = LLVMBuildAnd(builder, dst, z_bitmask, ""); |
| 197 | } |
| 198 | |
| 199 | lp_build_name(dst, "zsbuf.z"); |
| 200 | |
| 201 | test = lp_build_cmp(&bld, state->func, src, dst); |
José Fonseca | 3d7a886 | 2009-08-21 13:49:10 +0100 | [diff] [blame] | 202 | lp_build_mask_update(mask, test); |
José Fonseca | 343ccc8 | 2009-08-21 07:43:49 +0100 | [diff] [blame] | 203 | |
| 204 | if(state->writemask) { |
| 205 | if(z_bitmask) |
José Fonseca | 3d7a886 | 2009-08-21 13:49:10 +0100 | [diff] [blame] | 206 | z_bitmask = LLVMBuildAnd(builder, mask->value, z_bitmask, ""); |
José Fonseca | 343ccc8 | 2009-08-21 07:43:49 +0100 | [diff] [blame] | 207 | else |
José Fonseca | 3d7a886 | 2009-08-21 13:49:10 +0100 | [diff] [blame] | 208 | z_bitmask = mask->value; |
José Fonseca | 343ccc8 | 2009-08-21 07:43:49 +0100 | [diff] [blame] | 209 | |
| 210 | dst = lp_build_select(&bld, z_bitmask, src, dst); |
| 211 | LLVMBuildStore(builder, dst, dst_ptr); |
| 212 | } |
José Fonseca | 343ccc8 | 2009-08-21 07:43:49 +0100 | [diff] [blame] | 213 | } |