src/gallium/drivers/radeonsi/si_state_msaa.c

   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
  85  * the primitive discard compute shader relies on them.
  86  */
  87
  88 /* 1x MSAA */
  89 static 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 */
  91 static const uint64_t centroid_priority_1x = 0x0000000000000000ull;
  92
  93 /* 2x MSAA (the positions are sorted for EQAA) */
  94 static 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 */
  96 static const uint64_t centroid_priority_2x = 0x1010101010101010ull;
  97
  98 /* 4x MSAA (the positions are sorted for EQAA) */
  99 static const uint32_t sample_locs_4x = FILL_SREG(-2, -6, 2, 6, -6, 2, 6, -2);
 100 static const uint64_t centroid_priority_4x = 0x3210321032103210ull;
 101
 102 /* 8x MSAA (the positions are sorted for EQAA) */
 103 static 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 };
 111 static const uint64_t centroid_priority_8x = 0x3546012735460127ull;
 112
 113 /* 16x MSAA (the positions are sorted for EQAA) */
 114 static 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 };
 120 static const uint64_t centroid_priority_16x = 0xc97e64b231d0fa85ull;
 121
 122 static 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
 150 static void si_emit_max_4_sample_locs(struct radeon_cmdbuf *cs, uint64_t centroid_priority,
 151                                       uint32_t sample_locs)
 152 {
 153    radeon_set_context_reg_seq(cs, R_028BD4_PA_SC_CENTROID_PRIORITY_0, 2);
 154    radeon_emit(cs, centroid_priority);
 155    radeon_emit(cs, centroid_priority >> 32);
 156    radeon_set_context_reg(cs, R_028BF8_PA_SC_AA_SAMPLE_LOCS_PIXEL_X0Y0_0, sample_locs);
 157    radeon_set_context_reg(cs, R_028C08_PA_SC_AA_SAMPLE_LOCS_PIXEL_X1Y0_0, sample_locs);
 158    radeon_set_context_reg(cs, R_028C18_PA_SC_AA_SAMPLE_LOCS_PIXEL_X0Y1_0, sample_locs);
 159    radeon_set_context_reg(cs, R_028C28_PA_SC_AA_SAMPLE_LOCS_PIXEL_X1Y1_0, sample_locs);
 160 }
 161
 162 static void si_emit_max_16_sample_locs(struct radeon_cmdbuf *cs, uint64_t centroid_priority,
 163                                        const uint32_t *sample_locs, unsigned num_samples)
 164 {
 165    radeon_set_context_reg_seq(cs, R_028BD4_PA_SC_CENTROID_PRIORITY_0, 2);
 166    radeon_emit(cs, centroid_priority);
 167    radeon_emit(cs, centroid_priority >> 32);
 168    radeon_set_context_reg_seq(cs, R_028BF8_PA_SC_AA_SAMPLE_LOCS_PIXEL_X0Y0_0,
 169                               num_samples == 8 ? 14 : 16);
 170    radeon_emit_array(cs, sample_locs, 4);
 171    radeon_emit_array(cs, sample_locs, 4);
 172    radeon_emit_array(cs, sample_locs, 4);
 173    radeon_emit_array(cs, sample_locs, num_samples == 8 ? 2 : 4);
 174 }
 175
 176 void si_emit_sample_locations(struct radeon_cmdbuf *cs, int nr_samples)
 177 {
 178    switch (nr_samples) {
 179    default:
 180    case 1:
 181       si_emit_max_4_sample_locs(cs, centroid_priority_1x, sample_locs_1x);
 182       break;
 183    case 2:
 184       si_emit_max_4_sample_locs(cs, centroid_priority_2x, sample_locs_2x);
 185       break;
 186    case 4:
 187       si_emit_max_4_sample_locs(cs, centroid_priority_4x, sample_locs_4x);
 188       break;
 189    case 8:
 190       si_emit_max_16_sample_locs(cs, centroid_priority_8x, sample_locs_8x, 8);
 191       break;
 192    case 16:
 193       si_emit_max_16_sample_locs(cs, centroid_priority_16x, sample_locs_16x, 16);
 194       break;
 195    }
 196 }
 197
 198 void si_init_msaa_functions(struct si_context *sctx)
 199 {
 200    int i;
 201
 202    sctx->b.get_sample_position = si_get_sample_position;
 203
 204    si_get_sample_position(&sctx->b, 1, 0, sctx->sample_positions.x1[0]);
 205
 206    for (i = 0; i < 2; i++)
 207       si_get_sample_position(&sctx->b, 2, i, sctx->sample_positions.x2[i]);
 208    for (i = 0; i < 4; i++)
 209       si_get_sample_position(&sctx->b, 4, i, sctx->sample_positions.x4[i]);
 210    for (i = 0; i < 8; i++)
 211       si_get_sample_position(&sctx->b, 8, i, sctx->sample_positions.x8[i]);
 212    for (i = 0; i < 16; i++)
 213       si_get_sample_position(&sctx->b, 16, i, sctx->sample_positions.x16[i]);
 214 }