1/* 2 * Copyright 2014 Advanced Micro Devices, Inc. 3 * All Rights Reserved. 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 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 9 * and/or sell copies of the Software, and to permit persons to whom the 10 * 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 NONINFRINGEMENT. IN NO EVENT SHALL 19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 22 * SOFTWARE. 23 */ 24 25#include "si_build_pm4.h" 26 27/* For MSAA sample positions. */ 28#define FILL_SREG(s0x, s0y, s1x, s1y, s2x, s2y, s3x, s3y) \ 29 ((((unsigned)(s0x)&0xf) << 0) | (((unsigned)(s0y)&0xf) << 4) | (((unsigned)(s1x)&0xf) << 8) | \ 30 (((unsigned)(s1y)&0xf) << 12) | (((unsigned)(s2x)&0xf) << 16) | \ 31 (((unsigned)(s2y)&0xf) << 20) | (((unsigned)(s3x)&0xf) << 24) | (((unsigned)(s3y)&0xf) << 28)) 32 33/* For obtaining location coordinates from registers */ 34#define SEXT4(x) ((int)((x) | ((x)&0x8 ? 0xfffffff0 : 0))) 35#define GET_SFIELD(reg, index) SEXT4(((reg) >> ((index)*4)) & 0xf) 36#define GET_SX(reg, index) GET_SFIELD((reg)[(index) / 4], ((index) % 4) * 2) 37#define GET_SY(reg, index) GET_SFIELD((reg)[(index) / 4], ((index) % 4) * 2 + 1) 38 39/* The following sample ordering is required by EQAA. 40 * 41 * Sample 0 is approx. in the top-left quadrant. 42 * Sample 1 is approx. in the bottom-right quadrant. 43 * 44 * Sample 2 is approx. in the bottom-left quadrant. 45 * Sample 3 is approx. in the top-right quadrant. 46 * (sample I={2,3} adds more detail to the vicinity of sample I-2) 47 * 48 * Sample 4 is approx. in the same quadrant as sample 0. (top-left) 49 * Sample 5 is approx. in the same quadrant as sample 1. (bottom-right) 50 * Sample 6 is approx. in the same quadrant as sample 2. (bottom-left) 51 * Sample 7 is approx. in the same quadrant as sample 3. (top-right) 52 * (sample I={4,5,6,7} adds more detail to the vicinity of sample I-4) 53 * 54 * The next 8 samples add more detail to the vicinity of the previous samples. 55 * (sample I (I >= 8) adds more detail to the vicinity of sample I-8) 56 * 57 * The ordering is specified such that: 58 * If we take the first 2 samples, we should get good 2x MSAA. 59 * If we add 2 more samples, we should get good 4x MSAA with the same sample locations. 60 * If we add 4 more samples, we should get good 8x MSAA with the same sample locations. 61 * If we add 8 more samples, we should get perfect 16x MSAA with the same sample locations. 62 * 63 * The ordering also allows finding samples in the same vicinity. 64 * 65 * Group N of 2 samples in the same vicinity in 16x MSAA: {N,N+8} 66 * Group N of 2 samples in the same vicinity in 8x MSAA: {N,N+4} 67 * Group N of 2 samples in the same vicinity in 4x MSAA: {N,N+2} 68 * 69 * Groups of 4 samples in the same vicinity in 16x MSAA: 70 * Top left: {0,4,8,12} 71 * Bottom right: {1,5,9,13} 72 * Bottom left: {2,6,10,14} 73 * Top right: {3,7,11,15} 74 * 75 * Groups of 4 samples in the same vicinity in 8x MSAA: 76 * Left half: {0,2,4,6} 77 * Right half: {1,3,5,7} 78 * 79 * Groups of 8 samples in the same vicinity in 16x MSAA: 80 * Left half: {0,2,4,6,8,10,12,14} 81 * Right half: {1,3,5,7,9,11,13,15} 82 */ 83 84/* Important note: We have to use the standard DX positions because shader-based culling 85 * relies on them. 86 */ 87 88/* 1x MSAA */ 89static const uint32_t sample_locs_1x = 90 FILL_SREG(0, 0, 0, 0, 0, 0, 0, 0); /* S1, S2, S3 fields are not used by 1x */ 91static const uint64_t centroid_priority_1x = 0x0000000000000000ull; 92 93/* 2x MSAA (the positions are sorted for EQAA) */ 94static const uint32_t sample_locs_2x = 95 FILL_SREG(-4, -4, 4, 4, 0, 0, 0, 0); /* S2 & S3 fields are not used by 2x MSAA */ 96static const uint64_t centroid_priority_2x = 0x1010101010101010ull; 97 98/* 4x MSAA (the positions are sorted for EQAA) */ 99static const uint32_t sample_locs_4x = FILL_SREG(-2, -6, 2, 6, -6, 2, 6, -2); 100static const uint64_t centroid_priority_4x = 0x3210321032103210ull; 101 102/* 8x MSAA (the positions are sorted for EQAA) */ 103static const uint32_t sample_locs_8x[] = { 104 FILL_SREG(-3, -5, 5, 1, -1, 3, 7, -7), 105 FILL_SREG(-7, -1, 3, 7, -5, 5, 1, -3), 106 /* The following are unused by hardware, but we emit them to IBs 107 * instead of multiple SET_CONTEXT_REG packets. */ 108 0, 109 0, 110}; 111static const uint64_t centroid_priority_8x = 0x3546012735460127ull; 112 113/* 16x MSAA (the positions are sorted for EQAA) */ 114static const uint32_t sample_locs_16x[] = { 115 FILL_SREG(-5, -2, 5, 3, -2, 6, 3, -5), 116 FILL_SREG(-4, -6, 1, 1, -6, 4, 7, -4), 117 FILL_SREG(-1, -3, 6, 7, -3, 2, 0, -7), 118 FILL_SREG(-7, -8, 2, 5, -8, 0, 4, -1), 119}; 120static const uint64_t centroid_priority_16x = 0xc97e64b231d0fa85ull; 121 122static void si_get_sample_position(struct pipe_context *ctx, unsigned sample_count, 123 unsigned sample_index, float *out_value) 124{ 125 const uint32_t *sample_locs; 126 127 switch (sample_count) { 128 case 1: 129 default: 130 sample_locs = &sample_locs_1x; 131 break; 132 case 2: 133 sample_locs = &sample_locs_2x; 134 break; 135 case 4: 136 sample_locs = &sample_locs_4x; 137 break; 138 case 8: 139 sample_locs = sample_locs_8x; 140 break; 141 case 16: 142 sample_locs = sample_locs_16x; 143 break; 144 } 145 146 out_value[0] = (GET_SX(sample_locs, sample_index) + 8) / 16.0f; 147 out_value[1] = (GET_SY(sample_locs, sample_index) + 8) / 16.0f; 148} 149 150static void si_emit_max_4_sample_locs(struct radeon_cmdbuf *cs, uint64_t centroid_priority, 151 uint32_t sample_locs) 152{ 153 radeon_begin(cs); 154 radeon_set_context_reg_seq(R_028BD4_PA_SC_CENTROID_PRIORITY_0, 2); 155 radeon_emit(centroid_priority); 156 radeon_emit(centroid_priority >> 32); 157 radeon_set_context_reg(R_028BF8_PA_SC_AA_SAMPLE_LOCS_PIXEL_X0Y0_0, sample_locs); 158 radeon_set_context_reg(R_028C08_PA_SC_AA_SAMPLE_LOCS_PIXEL_X1Y0_0, sample_locs); 159 radeon_set_context_reg(R_028C18_PA_SC_AA_SAMPLE_LOCS_PIXEL_X0Y1_0, sample_locs); 160 radeon_set_context_reg(R_028C28_PA_SC_AA_SAMPLE_LOCS_PIXEL_X1Y1_0, sample_locs); 161 radeon_end(); 162} 163 164static void si_emit_max_16_sample_locs(struct radeon_cmdbuf *cs, uint64_t centroid_priority, 165 const uint32_t *sample_locs, unsigned num_samples) 166{ 167 radeon_begin(cs); 168 radeon_set_context_reg_seq(R_028BD4_PA_SC_CENTROID_PRIORITY_0, 2); 169 radeon_emit(centroid_priority); 170 radeon_emit(centroid_priority >> 32); 171 radeon_set_context_reg_seq(R_028BF8_PA_SC_AA_SAMPLE_LOCS_PIXEL_X0Y0_0, 172 num_samples == 8 ? 14 : 16); 173 radeon_emit_array(sample_locs, 4); 174 radeon_emit_array(sample_locs, 4); 175 radeon_emit_array(sample_locs, 4); 176 radeon_emit_array(sample_locs, num_samples == 8 ? 2 : 4); 177 radeon_end(); 178} 179 180void si_emit_sample_locations(struct radeon_cmdbuf *cs, int nr_samples) 181{ 182 switch (nr_samples) { 183 default: 184 case 1: 185 si_emit_max_4_sample_locs(cs, centroid_priority_1x, sample_locs_1x); 186 break; 187 case 2: 188 si_emit_max_4_sample_locs(cs, centroid_priority_2x, sample_locs_2x); 189 break; 190 case 4: 191 si_emit_max_4_sample_locs(cs, centroid_priority_4x, sample_locs_4x); 192 break; 193 case 8: 194 si_emit_max_16_sample_locs(cs, centroid_priority_8x, sample_locs_8x, 8); 195 break; 196 case 16: 197 si_emit_max_16_sample_locs(cs, centroid_priority_16x, sample_locs_16x, 16); 198 break; 199 } 200} 201 202void si_init_msaa_functions(struct si_context *sctx) 203{ 204 int i; 205 206 sctx->b.get_sample_position = si_get_sample_position; 207 208 si_get_sample_position(&sctx->b, 1, 0, sctx->sample_positions.x1[0]); 209 210 for (i = 0; i < 2; i++) 211 si_get_sample_position(&sctx->b, 2, i, sctx->sample_positions.x2[i]); 212 for (i = 0; i < 4; i++) 213 si_get_sample_position(&sctx->b, 4, i, sctx->sample_positions.x4[i]); 214 for (i = 0; i < 8; i++) 215 si_get_sample_position(&sctx->b, 8, i, sctx->sample_positions.x8[i]); 216 for (i = 0; i < 16; i++) 217 si_get_sample_position(&sctx->b, 16, i, sctx->sample_positions.x16[i]); 218} 219