gen6_multisample_state.c revision 2a9ab29ed9ff3a5e92ade4c44b4deaededc1c4bc
119e9b24626c2b9d7abef054d57bb2a52106c545bPaul Berry/* 219e9b24626c2b9d7abef054d57bb2a52106c545bPaul Berry * Copyright © 2012 Intel Corporation 319e9b24626c2b9d7abef054d57bb2a52106c545bPaul Berry * 419e9b24626c2b9d7abef054d57bb2a52106c545bPaul Berry * Permission is hereby granted, free of charge, to any person obtaining a 519e9b24626c2b9d7abef054d57bb2a52106c545bPaul Berry * copy of this software and associated documentation files (the "Software"), 619e9b24626c2b9d7abef054d57bb2a52106c545bPaul Berry * to deal in the Software without restriction, including without limitation 719e9b24626c2b9d7abef054d57bb2a52106c545bPaul Berry * the rights to use, copy, modify, merge, publish, distribute, sublicense, 819e9b24626c2b9d7abef054d57bb2a52106c545bPaul Berry * and/or sell copies of the Software, and to permit persons to whom the 919e9b24626c2b9d7abef054d57bb2a52106c545bPaul Berry * Software is furnished to do so, subject to the following conditions: 1019e9b24626c2b9d7abef054d57bb2a52106c545bPaul Berry * 1119e9b24626c2b9d7abef054d57bb2a52106c545bPaul Berry * The above copyright notice and this permission notice (including the next 1219e9b24626c2b9d7abef054d57bb2a52106c545bPaul Berry * paragraph) shall be included in all copies or substantial portions of the 1319e9b24626c2b9d7abef054d57bb2a52106c545bPaul Berry * Software. 1419e9b24626c2b9d7abef054d57bb2a52106c545bPaul Berry * 1519e9b24626c2b9d7abef054d57bb2a52106c545bPaul Berry * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 1619e9b24626c2b9d7abef054d57bb2a52106c545bPaul Berry * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 1719e9b24626c2b9d7abef054d57bb2a52106c545bPaul Berry * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 1819e9b24626c2b9d7abef054d57bb2a52106c545bPaul Berry * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 1919e9b24626c2b9d7abef054d57bb2a52106c545bPaul Berry * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 2019e9b24626c2b9d7abef054d57bb2a52106c545bPaul Berry * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS 2119e9b24626c2b9d7abef054d57bb2a52106c545bPaul Berry * IN THE SOFTWARE. 2219e9b24626c2b9d7abef054d57bb2a52106c545bPaul Berry */ 2319e9b24626c2b9d7abef054d57bb2a52106c545bPaul Berry 2419e9b24626c2b9d7abef054d57bb2a52106c545bPaul Berry#include "intel_batchbuffer.h" 2519e9b24626c2b9d7abef054d57bb2a52106c545bPaul Berry 2619e9b24626c2b9d7abef054d57bb2a52106c545bPaul Berry#include "brw_context.h" 2719e9b24626c2b9d7abef054d57bb2a52106c545bPaul Berry#include "brw_defines.h" 2819e9b24626c2b9d7abef054d57bb2a52106c545bPaul Berry 2919e9b24626c2b9d7abef054d57bb2a52106c545bPaul Berry 3019e9b24626c2b9d7abef054d57bb2a52106c545bPaul Berry/** 3119e9b24626c2b9d7abef054d57bb2a52106c545bPaul Berry * 3DSTATE_MULTISAMPLE 3219e9b24626c2b9d7abef054d57bb2a52106c545bPaul Berry */ 3319e9b24626c2b9d7abef054d57bb2a52106c545bPaul Berryvoid 3419e9b24626c2b9d7abef054d57bb2a52106c545bPaul Berrygen6_emit_3dstate_multisample(struct brw_context *brw, 3519e9b24626c2b9d7abef054d57bb2a52106c545bPaul Berry unsigned num_samples) 3619e9b24626c2b9d7abef054d57bb2a52106c545bPaul Berry{ 3719e9b24626c2b9d7abef054d57bb2a52106c545bPaul Berry struct intel_context *intel = &brw->intel; 3819e9b24626c2b9d7abef054d57bb2a52106c545bPaul Berry 392a9ab29ed9ff3a5e92ade4c44b4deaededc1c4bcPaul Berry uint32_t number_of_multisamples = 0; 402a9ab29ed9ff3a5e92ade4c44b4deaededc1c4bcPaul Berry uint32_t sample_positions_3210 = 0; 412a9ab29ed9ff3a5e92ade4c44b4deaededc1c4bcPaul Berry uint32_t sample_positions_7654 = 0; 422a9ab29ed9ff3a5e92ade4c44b4deaededc1c4bcPaul Berry 432a9ab29ed9ff3a5e92ade4c44b4deaededc1c4bcPaul Berry switch (num_samples) { 442a9ab29ed9ff3a5e92ade4c44b4deaededc1c4bcPaul Berry case 0: 452a9ab29ed9ff3a5e92ade4c44b4deaededc1c4bcPaul Berry number_of_multisamples = MS_NUMSAMPLES_1; 462a9ab29ed9ff3a5e92ade4c44b4deaededc1c4bcPaul Berry break; 472a9ab29ed9ff3a5e92ade4c44b4deaededc1c4bcPaul Berry case 4: 482a9ab29ed9ff3a5e92ade4c44b4deaededc1c4bcPaul Berry number_of_multisamples = MS_NUMSAMPLES_4; 492a9ab29ed9ff3a5e92ade4c44b4deaededc1c4bcPaul Berry /* Sample positions: 502a9ab29ed9ff3a5e92ade4c44b4deaededc1c4bcPaul Berry * 2 6 a e 512a9ab29ed9ff3a5e92ade4c44b4deaededc1c4bcPaul Berry * 2 0 522a9ab29ed9ff3a5e92ade4c44b4deaededc1c4bcPaul Berry * 6 1 532a9ab29ed9ff3a5e92ade4c44b4deaededc1c4bcPaul Berry * a 2 542a9ab29ed9ff3a5e92ade4c44b4deaededc1c4bcPaul Berry * e 3 552a9ab29ed9ff3a5e92ade4c44b4deaededc1c4bcPaul Berry */ 562a9ab29ed9ff3a5e92ade4c44b4deaededc1c4bcPaul Berry sample_positions_3210 = 0xae2ae662; 572a9ab29ed9ff3a5e92ade4c44b4deaededc1c4bcPaul Berry break; 582a9ab29ed9ff3a5e92ade4c44b4deaededc1c4bcPaul Berry case 8: 592a9ab29ed9ff3a5e92ade4c44b4deaededc1c4bcPaul Berry number_of_multisamples = MS_NUMSAMPLES_8; 602a9ab29ed9ff3a5e92ade4c44b4deaededc1c4bcPaul Berry /* Sample positions are based on a solution to the "8 queens" puzzle. 612a9ab29ed9ff3a5e92ade4c44b4deaededc1c4bcPaul Berry * Rationale: in a solution to the 8 queens puzzle, no two queens share 622a9ab29ed9ff3a5e92ade4c44b4deaededc1c4bcPaul Berry * a row, column, or diagonal. This is a desirable property for samples 632a9ab29ed9ff3a5e92ade4c44b4deaededc1c4bcPaul Berry * in a multisampling pattern, because it ensures that the samples are 642a9ab29ed9ff3a5e92ade4c44b4deaededc1c4bcPaul Berry * relatively uniformly distributed through the pixel. 652a9ab29ed9ff3a5e92ade4c44b4deaededc1c4bcPaul Berry * 662a9ab29ed9ff3a5e92ade4c44b4deaededc1c4bcPaul Berry * There are several solutions to the 8 queens puzzle (see 672a9ab29ed9ff3a5e92ade4c44b4deaededc1c4bcPaul Berry * http://en.wikipedia.org/wiki/Eight_queens_puzzle). This solution was 682a9ab29ed9ff3a5e92ade4c44b4deaededc1c4bcPaul Berry * chosen because it has a queen close to the center; this should 692a9ab29ed9ff3a5e92ade4c44b4deaededc1c4bcPaul Berry * improve the accuracy of centroid interpolation, since the hardware 702a9ab29ed9ff3a5e92ade4c44b4deaededc1c4bcPaul Berry * implements centroid interpolation by choosing the centermost sample 712a9ab29ed9ff3a5e92ade4c44b4deaededc1c4bcPaul Berry * that overlaps with the primitive being drawn. 722a9ab29ed9ff3a5e92ade4c44b4deaededc1c4bcPaul Berry * 732a9ab29ed9ff3a5e92ade4c44b4deaededc1c4bcPaul Berry * Note: from the Ivy Bridge PRM, Vol2 Part1 p304 (3DSTATE_MULTISAMPLE: 742a9ab29ed9ff3a5e92ade4c44b4deaededc1c4bcPaul Berry * Programming Notes): 752a9ab29ed9ff3a5e92ade4c44b4deaededc1c4bcPaul Berry * 762a9ab29ed9ff3a5e92ade4c44b4deaededc1c4bcPaul Berry * "When programming the sample offsets (for NUMSAMPLES_4 or _8 and 772a9ab29ed9ff3a5e92ade4c44b4deaededc1c4bcPaul Berry * MSRASTMODE_xxx_PATTERN), the order of the samples 0 to 3 (or 7 782a9ab29ed9ff3a5e92ade4c44b4deaededc1c4bcPaul Berry * for 8X) must have monotonically increasing distance from the 792a9ab29ed9ff3a5e92ade4c44b4deaededc1c4bcPaul Berry * pixel center. This is required to get the correct centroid 802a9ab29ed9ff3a5e92ade4c44b4deaededc1c4bcPaul Berry * computation in the device." 812a9ab29ed9ff3a5e92ade4c44b4deaededc1c4bcPaul Berry * 822a9ab29ed9ff3a5e92ade4c44b4deaededc1c4bcPaul Berry * Sample positions: 832a9ab29ed9ff3a5e92ade4c44b4deaededc1c4bcPaul Berry * 1 3 5 7 9 b d f 842a9ab29ed9ff3a5e92ade4c44b4deaededc1c4bcPaul Berry * 1 5 852a9ab29ed9ff3a5e92ade4c44b4deaededc1c4bcPaul Berry * 3 2 862a9ab29ed9ff3a5e92ade4c44b4deaededc1c4bcPaul Berry * 5 6 872a9ab29ed9ff3a5e92ade4c44b4deaededc1c4bcPaul Berry * 7 4 882a9ab29ed9ff3a5e92ade4c44b4deaededc1c4bcPaul Berry * 9 0 892a9ab29ed9ff3a5e92ade4c44b4deaededc1c4bcPaul Berry * b 3 902a9ab29ed9ff3a5e92ade4c44b4deaededc1c4bcPaul Berry * d 1 912a9ab29ed9ff3a5e92ade4c44b4deaededc1c4bcPaul Berry * f 7 922a9ab29ed9ff3a5e92ade4c44b4deaededc1c4bcPaul Berry */ 932a9ab29ed9ff3a5e92ade4c44b4deaededc1c4bcPaul Berry sample_positions_3210 = 0xdbb39d79; 942a9ab29ed9ff3a5e92ade4c44b4deaededc1c4bcPaul Berry sample_positions_7654 = 0x3ff55117; 952a9ab29ed9ff3a5e92ade4c44b4deaededc1c4bcPaul Berry break; 962a9ab29ed9ff3a5e92ade4c44b4deaededc1c4bcPaul Berry default: 972a9ab29ed9ff3a5e92ade4c44b4deaededc1c4bcPaul Berry assert(!"Unrecognized num_samples in gen6_emit_3dstate_multisample"); 982a9ab29ed9ff3a5e92ade4c44b4deaededc1c4bcPaul Berry break; 992a9ab29ed9ff3a5e92ade4c44b4deaededc1c4bcPaul Berry } 10019e9b24626c2b9d7abef054d57bb2a52106c545bPaul Berry 10119e9b24626c2b9d7abef054d57bb2a52106c545bPaul Berry int len = intel->gen >= 7 ? 4 : 3; 10219e9b24626c2b9d7abef054d57bb2a52106c545bPaul Berry BEGIN_BATCH(len); 10319e9b24626c2b9d7abef054d57bb2a52106c545bPaul Berry OUT_BATCH(_3DSTATE_MULTISAMPLE << 16 | (len - 2)); 1042a9ab29ed9ff3a5e92ade4c44b4deaededc1c4bcPaul Berry OUT_BATCH(MS_PIXEL_LOCATION_CENTER | number_of_multisamples); 1052a9ab29ed9ff3a5e92ade4c44b4deaededc1c4bcPaul Berry OUT_BATCH(sample_positions_3210); 10619e9b24626c2b9d7abef054d57bb2a52106c545bPaul Berry if (intel->gen >= 7) 1072a9ab29ed9ff3a5e92ade4c44b4deaededc1c4bcPaul Berry OUT_BATCH(sample_positions_7654); 10819e9b24626c2b9d7abef054d57bb2a52106c545bPaul Berry ADVANCE_BATCH(); 10919e9b24626c2b9d7abef054d57bb2a52106c545bPaul Berry} 11019e9b24626c2b9d7abef054d57bb2a52106c545bPaul Berry 11119e9b24626c2b9d7abef054d57bb2a52106c545bPaul Berry 11219e9b24626c2b9d7abef054d57bb2a52106c545bPaul Berry/** 11319e9b24626c2b9d7abef054d57bb2a52106c545bPaul Berry * 3DSTATE_SAMPLE_MASK 11419e9b24626c2b9d7abef054d57bb2a52106c545bPaul Berry */ 11519e9b24626c2b9d7abef054d57bb2a52106c545bPaul Berryvoid 11619e9b24626c2b9d7abef054d57bb2a52106c545bPaul Berrygen6_emit_3dstate_sample_mask(struct brw_context *brw, 1179ea60ce58f8494e0b79771f93227f4b8181731dePaul Berry unsigned num_samples, float coverage, 1189ea60ce58f8494e0b79771f93227f4b8181731dePaul Berry bool coverage_invert) 11919e9b24626c2b9d7abef054d57bb2a52106c545bPaul Berry{ 12019e9b24626c2b9d7abef054d57bb2a52106c545bPaul Berry struct intel_context *intel = &brw->intel; 12119e9b24626c2b9d7abef054d57bb2a52106c545bPaul Berry 122ab014adaed14a9ca213447dc913d0dce7906be56Paul Berry /* TODO: 8x MSAA not implemented */ 123ab014adaed14a9ca213447dc913d0dce7906be56Paul Berry assert(num_samples <= 4); 12419e9b24626c2b9d7abef054d57bb2a52106c545bPaul Berry 12519e9b24626c2b9d7abef054d57bb2a52106c545bPaul Berry BEGIN_BATCH(2); 12619e9b24626c2b9d7abef054d57bb2a52106c545bPaul Berry OUT_BATCH(_3DSTATE_SAMPLE_MASK << 16 | (2 - 2)); 1279ea60ce58f8494e0b79771f93227f4b8181731dePaul Berry if (num_samples > 0) { 1289ea60ce58f8494e0b79771f93227f4b8181731dePaul Berry int coverage_int = (int) (num_samples * coverage + 0.5); 1299ea60ce58f8494e0b79771f93227f4b8181731dePaul Berry uint32_t coverage_bits = (1 << coverage_int) - 1; 1309ea60ce58f8494e0b79771f93227f4b8181731dePaul Berry if (coverage_invert) 1319ea60ce58f8494e0b79771f93227f4b8181731dePaul Berry coverage_bits ^= (1 << num_samples) - 1; 1329ea60ce58f8494e0b79771f93227f4b8181731dePaul Berry OUT_BATCH(coverage_bits); 1339ea60ce58f8494e0b79771f93227f4b8181731dePaul Berry } else { 1349ea60ce58f8494e0b79771f93227f4b8181731dePaul Berry OUT_BATCH(1); 1359ea60ce58f8494e0b79771f93227f4b8181731dePaul Berry } 13619e9b24626c2b9d7abef054d57bb2a52106c545bPaul Berry ADVANCE_BATCH(); 13719e9b24626c2b9d7abef054d57bb2a52106c545bPaul Berry} 13819e9b24626c2b9d7abef054d57bb2a52106c545bPaul Berry 13919e9b24626c2b9d7abef054d57bb2a52106c545bPaul Berry 14019e9b24626c2b9d7abef054d57bb2a52106c545bPaul Berrystatic void upload_multisample_state(struct brw_context *brw) 14119e9b24626c2b9d7abef054d57bb2a52106c545bPaul Berry{ 14219e9b24626c2b9d7abef054d57bb2a52106c545bPaul Berry struct intel_context *intel = &brw->intel; 14319e9b24626c2b9d7abef054d57bb2a52106c545bPaul Berry struct gl_context *ctx = &intel->ctx; 1449ea60ce58f8494e0b79771f93227f4b8181731dePaul Berry float coverage = 1.0; 1459ea60ce58f8494e0b79771f93227f4b8181731dePaul Berry float coverage_invert = false; 1469ea60ce58f8494e0b79771f93227f4b8181731dePaul Berry 147691c55f3560e5b8b9db9ecd2c089f13b41ec684fPaul Berry /* _NEW_BUFFERS */ 148691c55f3560e5b8b9db9ecd2c089f13b41ec684fPaul Berry unsigned num_samples = ctx->DrawBuffer->Visual.samples; 149691c55f3560e5b8b9db9ecd2c089f13b41ec684fPaul Berry 1509ea60ce58f8494e0b79771f93227f4b8181731dePaul Berry /* _NEW_MULTISAMPLE */ 1519ea60ce58f8494e0b79771f93227f4b8181731dePaul Berry if (ctx->Multisample._Enabled && ctx->Multisample.SampleCoverage) { 1529ea60ce58f8494e0b79771f93227f4b8181731dePaul Berry coverage = ctx->Multisample.SampleCoverageValue; 1539ea60ce58f8494e0b79771f93227f4b8181731dePaul Berry coverage_invert = ctx->Multisample.SampleCoverageInvert; 1549ea60ce58f8494e0b79771f93227f4b8181731dePaul Berry } 15519e9b24626c2b9d7abef054d57bb2a52106c545bPaul Berry 15619e9b24626c2b9d7abef054d57bb2a52106c545bPaul Berry /* 3DSTATE_MULTISAMPLE is nonpipelined. */ 15719e9b24626c2b9d7abef054d57bb2a52106c545bPaul Berry intel_emit_post_sync_nonzero_flush(intel); 15819e9b24626c2b9d7abef054d57bb2a52106c545bPaul Berry 15919e9b24626c2b9d7abef054d57bb2a52106c545bPaul Berry gen6_emit_3dstate_multisample(brw, num_samples); 1609ea60ce58f8494e0b79771f93227f4b8181731dePaul Berry gen6_emit_3dstate_sample_mask(brw, num_samples, coverage, coverage_invert); 16119e9b24626c2b9d7abef054d57bb2a52106c545bPaul Berry} 16219e9b24626c2b9d7abef054d57bb2a52106c545bPaul Berry 16319e9b24626c2b9d7abef054d57bb2a52106c545bPaul Berry 16419e9b24626c2b9d7abef054d57bb2a52106c545bPaul Berryconst struct brw_tracked_state gen6_multisample_state = { 16519e9b24626c2b9d7abef054d57bb2a52106c545bPaul Berry .dirty = { 1669ea60ce58f8494e0b79771f93227f4b8181731dePaul Berry .mesa = _NEW_BUFFERS | 1679ea60ce58f8494e0b79771f93227f4b8181731dePaul Berry _NEW_MULTISAMPLE, 16819e9b24626c2b9d7abef054d57bb2a52106c545bPaul Berry .brw = BRW_NEW_CONTEXT, 16919e9b24626c2b9d7abef054d57bb2a52106c545bPaul Berry .cache = 0 17019e9b24626c2b9d7abef054d57bb2a52106c545bPaul Berry }, 17119e9b24626c2b9d7abef054d57bb2a52106c545bPaul Berry .emit = upload_multisample_state 17219e9b24626c2b9d7abef054d57bb2a52106c545bPaul Berry}; 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