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  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. void
  31. gen6_get_sample_position(struct gl_context *ctx,
  32.                          struct gl_framebuffer *fb,
  33.                          GLuint index, GLfloat *result)
  34. {
  35.    uint8_t bits;
  36.  
  37.    switch (fb->Visual.samples) {
  38.    case 1:
  39.       result[0] = result[1] = 0.5f;
  40.       return;
  41.    case 2:
  42.       bits = brw_multisample_positions_1x_2x >> (8 * index);
  43.       break;
  44.    case 4:
  45.       bits = brw_multisample_positions_4x >> (8 * index);
  46.       break;
  47.    case 8:
  48.       bits = brw_multisample_positions_8x[index >> 2] >> (8 * (index & 3));
  49.       break;
  50.    default:
  51.       unreachable("Not implemented");
  52.    }
  53.  
  54.    /* Convert from U0.4 back to a floating point coordinate. */
  55.    result[0] = ((bits >> 4) & 0xf) / 16.0f;
  56.    result[1] = (bits & 0xf) / 16.0f;
  57. }
  58.  
  59. /**
  60.  * Sample index layout shows the numbering of slots in a rectangular
  61.  * grid of samples with in a pixel. Sample number layout shows the
  62.  * rectangular grid of samples roughly corresponding to the real sample
  63.  * locations with in a pixel. Sample number layout matches the sample
  64.  * index layout in case of 2X and 4x MSAA, but they are different in
  65.  * case of 8X MSAA.
  66.  *
  67.  * 2X MSAA sample index / number layout
  68.  *           ---------
  69.  *           | 0 | 1 |
  70.  *           ---------
  71.  *
  72.  * 4X MSAA sample index / number layout
  73.  *           ---------
  74.  *           | 0 | 1 |
  75.  *           ---------
  76.  *           | 2 | 3 |
  77.  *           ---------
  78.  *
  79.  * 8X MSAA sample index layout    8x MSAA sample number layout
  80.  *           ---------                      ---------
  81.  *           | 0 | 1 |                      | 5 | 2 |
  82.  *           ---------                      ---------
  83.  *           | 2 | 3 |                      | 4 | 6 |
  84.  *           ---------                      ---------
  85.  *           | 4 | 5 |                      | 0 | 3 |
  86.  *           ---------                      ---------
  87.  *           | 6 | 7 |                      | 7 | 1 |
  88.  *           ---------                      ---------
  89.  *
  90.  * A sample map is used to map sample indices to sample numbers.
  91.  */
  92. void
  93. gen6_set_sample_maps(struct gl_context *ctx)
  94. {
  95.    uint8_t map_2x[2] = {0, 1};
  96.    uint8_t map_4x[4] = {0, 1, 2, 3};
  97.    uint8_t map_8x[8] = {5, 2, 4, 6, 0, 3, 7, 1};
  98.  
  99.    memcpy(ctx->Const.SampleMap2x, map_2x, sizeof(map_2x));
  100.    memcpy(ctx->Const.SampleMap4x, map_4x, sizeof(map_4x));
  101.    memcpy(ctx->Const.SampleMap8x, map_8x, sizeof(map_8x));
  102. }
  103.  
  104. /**
  105.  * 3DSTATE_MULTISAMPLE
  106.  */
  107. void
  108. gen6_emit_3dstate_multisample(struct brw_context *brw,
  109.                               unsigned num_samples)
  110. {
  111.    uint32_t number_of_multisamples = 0;
  112.    uint32_t sample_positions_3210 = 0;
  113.    uint32_t sample_positions_7654 = 0;
  114.  
  115.    assert(brw->gen < 8);
  116.  
  117.    switch (num_samples) {
  118.    case 0:
  119.    case 1:
  120.       number_of_multisamples = MS_NUMSAMPLES_1;
  121.       break;
  122.    case 4:
  123.       number_of_multisamples = MS_NUMSAMPLES_4;
  124.       sample_positions_3210 = brw_multisample_positions_4x;
  125.       break;
  126.    case 8:
  127.       number_of_multisamples = MS_NUMSAMPLES_8;
  128.       sample_positions_3210 = brw_multisample_positions_8x[0];
  129.       sample_positions_7654 = brw_multisample_positions_8x[1];
  130.       break;
  131.    default:
  132.       unreachable("Unrecognized num_samples in gen6_emit_3dstate_multisample");
  133.    }
  134.  
  135.    int len = brw->gen >= 7 ? 4 : 3;
  136.    BEGIN_BATCH(len);
  137.    OUT_BATCH(_3DSTATE_MULTISAMPLE << 16 | (len - 2));
  138.    OUT_BATCH(MS_PIXEL_LOCATION_CENTER | number_of_multisamples);
  139.    OUT_BATCH(sample_positions_3210);
  140.    if (brw->gen >= 7)
  141.       OUT_BATCH(sample_positions_7654);
  142.    ADVANCE_BATCH();
  143. }
  144.  
  145.  
  146. unsigned
  147. gen6_determine_sample_mask(struct brw_context *brw)
  148. {
  149.    struct gl_context *ctx = &brw->ctx;
  150.    float coverage = 1.0;
  151.    float coverage_invert = false;
  152.    unsigned sample_mask = ~0u;
  153.  
  154.    /* BRW_NEW_NUM_SAMPLES */
  155.    unsigned num_samples = brw->num_samples;
  156.  
  157.    if (ctx->Multisample._Enabled) {
  158.       if (ctx->Multisample.SampleCoverage) {
  159.          coverage = ctx->Multisample.SampleCoverageValue;
  160.          coverage_invert = ctx->Multisample.SampleCoverageInvert;
  161.       }
  162.       if (ctx->Multisample.SampleMask) {
  163.          sample_mask = ctx->Multisample.SampleMaskValue;
  164.       }
  165.    }
  166.  
  167.    if (num_samples > 1) {
  168.       int coverage_int = (int) (num_samples * coverage + 0.5);
  169.       uint32_t coverage_bits = (1 << coverage_int) - 1;
  170.       if (coverage_invert)
  171.          coverage_bits ^= (1 << num_samples) - 1;
  172.       return coverage_bits & sample_mask;
  173.    } else {
  174.       return 1;
  175.    }
  176. }
  177.  
  178.  
  179. /**
  180.  * 3DSTATE_SAMPLE_MASK
  181.  */
  182. void
  183. gen6_emit_3dstate_sample_mask(struct brw_context *brw, unsigned mask)
  184. {
  185.    BEGIN_BATCH(2);
  186.    OUT_BATCH(_3DSTATE_SAMPLE_MASK << 16 | (2 - 2));
  187.    OUT_BATCH(mask);
  188.    ADVANCE_BATCH();
  189. }
  190.  
  191.  
  192. static void upload_multisample_state(struct brw_context *brw)
  193. {
  194.    /* BRW_NEW_NUM_SAMPLES */
  195.    gen6_emit_3dstate_multisample(brw, brw->num_samples);
  196.    gen6_emit_3dstate_sample_mask(brw, gen6_determine_sample_mask(brw));
  197. }
  198.  
  199.  
  200. const struct brw_tracked_state gen6_multisample_state = {
  201.    .dirty = {
  202.       .mesa = _NEW_MULTISAMPLE,
  203.       .brw = BRW_NEW_CONTEXT |
  204.              BRW_NEW_NUM_SAMPLES,
  205.    },
  206.    .emit = upload_multisample_state
  207. };
  208.