src/gallium/drivers/etnaviv/etnaviv_zsa.c

   1 /*
   2  * Copyright (c) 2012-2015 Etnaviv Project
   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, sub license,
   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
  12  * next paragraph) shall be included in all copies or substantial portions
  13  * of the 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 NON-INFRINGEMENT. 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
  21  * DEALINGS IN THE SOFTWARE.
  22  *
  23  * Authors:
  24  *    Wladimir J. van der Laan <laanwj@gmail.com>
  25  */
  26
  27 #include "etnaviv_zsa.h"
  28
  29 #include "etnaviv_context.h"
  30 #include "etnaviv_screen.h"
  31 #include "etnaviv_translate.h"
  32 #include "util/u_memory.h"
  33
  34 #include "hw/common.xml.h"
  35
  36 void *
  37 etna_zsa_state_create(struct pipe_context *pctx,
  38                       const struct pipe_depth_stencil_alpha_state *so)
  39 {
  40    struct etna_context *ctx = etna_context(pctx);
  41    struct etna_zsa_state *cs = CALLOC_STRUCT(etna_zsa_state);
  42
  43    if (!cs)
  44       return NULL;
  45
  46    cs->base = *so;
  47
  48    /* XXX does stencil[0] / stencil[1] order depend on rs->front_ccw? */
  49    bool early_z = !VIV_FEATURE(ctx->screen, chipFeatures, NO_EARLY_Z);
  50    bool disable_zs =
  51       (!so->depth.enabled || so->depth.func == PIPE_FUNC_ALWAYS) &&
  52       !so->depth.writemask;
  53
  54 /* Set operations to KEEP if write mask is 0.
  55  * When we don't do this, the depth buffer is written for the entire primitive
  56  * instead of just where the stencil condition holds (GC600 rev 0x0019, without
  57  * feature CORRECT_STENCIL).
  58  * Not sure if this is a hardware bug or just a strange edge case. */
  59 #if 0 /* TODO: It looks like a hardware bug */
  60     for(int i=0; i<2; ++i)
  61     {
  62         if(so->stencil[i].writemask == 0)
  63         {
  64             so->stencil[i].fail_op = so->stencil[i].zfail_op = so->stencil[i].zpass_op = PIPE_STENCIL_OP_KEEP;
  65         }
  66     }
  67 #endif
  68
  69    /* Determine whether to enable early z reject. Don't enable it when any of
  70     * the stencil-modifying functions is used. */
  71    if (so->stencil[0].enabled) {
  72       if (so->stencil[0].func != PIPE_FUNC_ALWAYS ||
  73           (so->stencil[1].enabled && so->stencil[1].func != PIPE_FUNC_ALWAYS))
  74          disable_zs = false;
  75
  76       if (so->stencil[0].fail_op != PIPE_STENCIL_OP_KEEP ||
  77           so->stencil[0].zfail_op != PIPE_STENCIL_OP_KEEP ||
  78           so->stencil[0].zpass_op != PIPE_STENCIL_OP_KEEP) {
  79          disable_zs = early_z = false;
  80       } else if (so->stencil[1].enabled) {
  81          if (so->stencil[1].fail_op != PIPE_STENCIL_OP_KEEP ||
  82              so->stencil[1].zfail_op != PIPE_STENCIL_OP_KEEP ||
  83              so->stencil[1].zpass_op != PIPE_STENCIL_OP_KEEP) {
  84             disable_zs = early_z = false;
  85          }
  86       }
  87    }
  88
  89    /* Disable early z reject when no depth test is enabled.
  90     * This avoids having to sample depth even though we know it's going to
  91     * succeed. */
  92    if (so->depth.enabled == false || so->depth.func == PIPE_FUNC_ALWAYS)
  93       early_z = false;
  94
  95    /* compare funcs have 1 to 1 mapping */
  96    cs->PE_DEPTH_CONFIG =
  97       VIVS_PE_DEPTH_CONFIG_DEPTH_FUNC(so->depth.enabled ? so->depth.func
  98                                                         : PIPE_FUNC_ALWAYS) |
  99       COND(so->depth.writemask, VIVS_PE_DEPTH_CONFIG_WRITE_ENABLE) |
 100       COND(early_z, VIVS_PE_DEPTH_CONFIG_EARLY_Z) |
 101       COND(disable_zs, VIVS_PE_DEPTH_CONFIG_DISABLE_ZS);
 102    cs->PE_ALPHA_OP =
 103       COND(so->alpha.enabled, VIVS_PE_ALPHA_OP_ALPHA_TEST) |
 104       VIVS_PE_ALPHA_OP_ALPHA_FUNC(so->alpha.func) |
 105       VIVS_PE_ALPHA_OP_ALPHA_REF(etna_cfloat_to_uint8(so->alpha.ref_value));
 106    cs->PE_STENCIL_OP =
 107       VIVS_PE_STENCIL_OP_FUNC_FRONT(so->stencil[0].func) |
 108       VIVS_PE_STENCIL_OP_FUNC_BACK(so->stencil[1].func) |
 109       VIVS_PE_STENCIL_OP_FAIL_FRONT(translate_stencil_op(so->stencil[0].fail_op)) |
 110       VIVS_PE_STENCIL_OP_FAIL_BACK(translate_stencil_op(so->stencil[1].fail_op)) |
 111       VIVS_PE_STENCIL_OP_DEPTH_FAIL_FRONT(translate_stencil_op(so->stencil[0].zfail_op)) |
 112       VIVS_PE_STENCIL_OP_DEPTH_FAIL_BACK(translate_stencil_op(so->stencil[1].zfail_op)) |
 113       VIVS_PE_STENCIL_OP_PASS_FRONT(translate_stencil_op(so->stencil[0].zpass_op)) |
 114       VIVS_PE_STENCIL_OP_PASS_BACK(translate_stencil_op(so->stencil[1].zpass_op));
 115    cs->PE_STENCIL_CONFIG =
 116       translate_stencil_mode(so->stencil[0].enabled, so->stencil[1].enabled) |
 117       VIVS_PE_STENCIL_CONFIG_MASK_FRONT(so->stencil[0].valuemask) |
 118       VIVS_PE_STENCIL_CONFIG_WRITE_MASK_FRONT(so->stencil[0].writemask);
 119    /* XXX back masks in VIVS_PE_DEPTH_CONFIG_EXT? */
 120    /* XXX VIVS_PE_STENCIL_CONFIG_REF_FRONT comes from pipe_stencil_ref */
 121
 122    /* XXX does alpha/stencil test affect PE_COLOR_FORMAT_OVERWRITE? */
 123    return cs;
 124 }