src/mesa/drivers/dri/i965/gen8_multisample_state.c

   1 /*
   2  * Copyright © 2012 Intel Corporation
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  21  * IN THE SOFTWARE.
  22  */
  23
  24 #include "intel_batchbuffer.h"
  25
  26 #include "brw_context.h"
  27 #include "brw_defines.h"
  28 #include "brw_multisample_state.h"
  29
  30 /**
  31  * 3DSTATE_MULTISAMPLE
  32  */
  33 void
  34 gen8_emit_3dstate_multisample(struct brw_context *brw, unsigned num_samples)
  35 {
  36    assert(num_samples <= 16);
  37
  38    unsigned log2_samples = ffs(MAX2(num_samples, 1)) - 1;
  39
  40    BEGIN_BATCH(2);
  41    OUT_BATCH(GEN8_3DSTATE_MULTISAMPLE << 16 | (2 - 2));
  42    OUT_BATCH(MS_PIXEL_LOCATION_CENTER | log2_samples << 1);
  43    ADVANCE_BATCH();
  44 }
  45
  46 /**
  47  * 3DSTATE_SAMPLE_PATTERN
  48  */
  49 void
  50 gen8_emit_3dstate_sample_pattern(struct brw_context *brw)
  51 {
  52    BEGIN_BATCH(9);
  53    OUT_BATCH(_3DSTATE_SAMPLE_PATTERN << 16 | (9 - 2));
  54
  55    /* 16x MSAA */
  56    OUT_BATCH(brw_multisample_positions_16x[0]); /* positions  3,  2,  1,  0 */
  57    OUT_BATCH(brw_multisample_positions_16x[1]); /* positions  7,  6,  5,  4 */
  58    OUT_BATCH(brw_multisample_positions_16x[2]); /* positions 11, 10,  9,  8 */
  59    OUT_BATCH(brw_multisample_positions_16x[3]); /* positions 15, 14, 13, 12 */
  60
  61    /* 8x MSAA */
  62    OUT_BATCH(brw_multisample_positions_8x[1]); /* sample positions 7654 */
  63    OUT_BATCH(brw_multisample_positions_8x[0]); /* sample positions 3210 */
  64
  65    /* 4x MSAA */
  66    OUT_BATCH(brw_multisample_positions_4x);
  67
  68    /* 1x and 2x MSAA */
  69    OUT_BATCH(brw_multisample_positions_1x_2x);
  70    ADVANCE_BATCH();
  71 }
  72
  73
  74 static void
  75 upload_multisample_state(struct brw_context *brw)
  76 {
  77    gen8_emit_3dstate_multisample(brw, brw->num_samples);
  78    gen6_emit_3dstate_sample_mask(brw, gen6_determine_sample_mask(brw));
  79 }
  80
  81 const struct brw_tracked_state gen8_multisample_state = {
  82    .dirty = {
  83       .mesa = _NEW_MULTISAMPLE,
  84       .brw = BRW_NEW_BLORP |
  85              BRW_NEW_CONTEXT |
  86              BRW_NEW_NUM_SAMPLES,
  87    },
  88    .emit = upload_multisample_state
  89 };