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