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    uint32_t number_of_multisamples = 0;
  37
  38    switch (num_samples) {
  39    case 0:
  40    case 1:
  41       number_of_multisamples = MS_NUMSAMPLES_1;
  42       break;
  43    case 2:
  44       number_of_multisamples = MS_NUMSAMPLES_2;
  45       break;
  46    case 4:
  47       number_of_multisamples = MS_NUMSAMPLES_4;
  48       break;
  49    case 8:
  50       number_of_multisamples = MS_NUMSAMPLES_8;
  51       break;
  52    case 16:
  53       number_of_multisamples = MS_NUMSAMPLES_16;
  54       break;
  55    default:
  56       assert(!"Unrecognized num_samples in gen8_emit_3dstate_multisample");
  57       break;
  58    }
  59
  60    BEGIN_BATCH(2);
  61    OUT_BATCH(GEN8_3DSTATE_MULTISAMPLE << 16 | (2 - 2));
  62    OUT_BATCH(MS_PIXEL_LOCATION_CENTER | number_of_multisamples);
  63    ADVANCE_BATCH();
  64 }
  65
  66 /**
  67  * 3DSTATE_SAMPLE_PATTERN
  68  */
  69 void
  70 gen8_emit_3dstate_sample_pattern(struct brw_context *brw)
  71 {
  72    BEGIN_BATCH(9);
  73    OUT_BATCH(_3DSTATE_SAMPLE_PATTERN << 16 | (9 - 2));
  74
  75    /* 16x MSAA
  76     * XXX: Need to program these.
  77     */
  78    OUT_BATCH(0);
  79    OUT_BATCH(0);
  80    OUT_BATCH(0);
  81    OUT_BATCH(0);
  82
  83    /* 8x MSAA */
  84    OUT_BATCH(brw_multisample_positions_8x[1]); /* sample positions 7654 */
  85    OUT_BATCH(brw_multisample_positions_8x[0]); /* sample positions 3210 */
  86
  87    /* 4x MSAA */
  88    OUT_BATCH(brw_multisample_positions_4x[0]);
  89
  90    /* 2x and 1x MSAA patterns
  91     * XXX: need to program 2x.
  92     */
  93    OUT_BATCH(0x00880000);
  94    ADVANCE_BATCH();
  95 }
  96
  97
  98 static void
  99 upload_multisample_state(struct brw_context *brw)
 100 {
 101    struct gl_context *ctx = &brw->ctx;
 102
 103    /* _NEW_BUFFERS, _NEW_MULTISAMPLE */
 104    unsigned num_samples = ctx->DrawBuffer->Visual.samples;
 105
 106    gen8_emit_3dstate_multisample(brw, num_samples);
 107    gen6_emit_3dstate_sample_mask(brw, gen6_determine_sample_mask(brw));
 108 }
 109
 110 const struct brw_tracked_state gen8_multisample_state = {
 111    .dirty = {
 112       .mesa = _NEW_BUFFERS | _NEW_MULTISAMPLE,
 113       .brw = BRW_NEW_CONTEXT,
 114       .cache = 0
 115    },
 116    .emit = upload_multisample_state
 117 };