1 /**************************************************************************
2 *
3 * Copyright 2007 VMware, Inc.
4 * All Rights Reserved.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the
8 * "Software"), to deal in the Software without restriction, including
9 * without limitation the rights to use, copy, modify, merge, publish,
10 * distribute, sub license, and/or sell copies of the Software, and to
11 * permit persons to whom the Software is furnished to do so, subject to
12 * the following conditions:
13 *
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial portions
16 * of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
20 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
21 * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
22 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
23 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
24 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
25 *
26 **************************************************************************/
27
28 /*
29 * Authors:
30 * Keith Whitwell <keithw@vmware.com>
31 * Brian Paul
32 * Zack Rusin
33 */
34
35
36 #include <assert.h>
37
38 #include "st_context.h"
39 #include "st_atom.h"
40 #include "pipe/p_context.h"
41 #include "pipe/p_defines.h"
42 #include "cso_cache/cso_context.h"
43 #include "main/samplerobj.h"
44 #include "main/stencil.h"
45
46
47 /**
48 * Convert GLenum stencil op tokens to pipe tokens.
49 */
50 static GLuint
gl_stencil_op_to_pipe(GLenum func)51 gl_stencil_op_to_pipe(GLenum func)
52 {
53 switch (func) {
54 case GL_KEEP:
55 return PIPE_STENCIL_OP_KEEP;
56 case GL_ZERO:
57 return PIPE_STENCIL_OP_ZERO;
58 case GL_REPLACE:
59 return PIPE_STENCIL_OP_REPLACE;
60 case GL_INCR:
61 return PIPE_STENCIL_OP_INCR;
62 case GL_DECR:
63 return PIPE_STENCIL_OP_DECR;
64 case GL_INCR_WRAP:
65 return PIPE_STENCIL_OP_INCR_WRAP;
66 case GL_DECR_WRAP:
67 return PIPE_STENCIL_OP_DECR_WRAP;
68 case GL_INVERT:
69 return PIPE_STENCIL_OP_INVERT;
70 default:
71 assert("invalid GL token in gl_stencil_op_to_pipe()" == NULL);
72 return 0;
73 }
74 }
75
76 void
st_update_depth_stencil_alpha(struct st_context * st)77 st_update_depth_stencil_alpha(struct st_context *st)
78 {
79 struct pipe_depth_stencil_alpha_state *dsa = &st->state.depth_stencil;
80 struct pipe_stencil_ref sr;
81 struct gl_context *ctx = st->ctx;
82
83 memset(dsa, 0, sizeof(*dsa));
84 memset(&sr, 0, sizeof(sr));
85
86 if (ctx->DrawBuffer->Visual.depthBits > 0) {
87 if (ctx->Depth.Test) {
88 dsa->depth_enabled = 1;
89 dsa->depth_func = func_to_gallium(ctx->Depth.Func);
90 if (dsa->depth_func != PIPE_FUNC_EQUAL)
91 dsa->depth_writemask = ctx->Depth.Mask;
92 }
93 if (ctx->Depth.BoundsTest) {
94 dsa->depth_bounds_test = 1;
95 dsa->depth_bounds_min = ctx->Depth.BoundsMin;
96 dsa->depth_bounds_max = ctx->Depth.BoundsMax;
97 }
98 }
99
100 if (ctx->Stencil.Enabled && ctx->DrawBuffer->Visual.stencilBits > 0) {
101 dsa->stencil[0].enabled = 1;
102 dsa->stencil[0].func = func_to_gallium(ctx->Stencil.Function[0]);
103 dsa->stencil[0].fail_op = gl_stencil_op_to_pipe(ctx->Stencil.FailFunc[0]);
104 dsa->stencil[0].zfail_op = gl_stencil_op_to_pipe(ctx->Stencil.ZFailFunc[0]);
105 dsa->stencil[0].zpass_op = gl_stencil_op_to_pipe(ctx->Stencil.ZPassFunc[0]);
106 dsa->stencil[0].valuemask = ctx->Stencil.ValueMask[0] & 0xff;
107 dsa->stencil[0].writemask = ctx->Stencil.WriteMask[0] & 0xff;
108 sr.ref_value[0] = _mesa_get_stencil_ref(ctx, 0);
109
110 if (_mesa_stencil_is_two_sided(ctx)) {
111 const GLuint back = ctx->Stencil._BackFace;
112 dsa->stencil[1].enabled = 1;
113 dsa->stencil[1].func = func_to_gallium(ctx->Stencil.Function[back]);
114 dsa->stencil[1].fail_op = gl_stencil_op_to_pipe(ctx->Stencil.FailFunc[back]);
115 dsa->stencil[1].zfail_op = gl_stencil_op_to_pipe(ctx->Stencil.ZFailFunc[back]);
116 dsa->stencil[1].zpass_op = gl_stencil_op_to_pipe(ctx->Stencil.ZPassFunc[back]);
117 dsa->stencil[1].valuemask = ctx->Stencil.ValueMask[back] & 0xff;
118 dsa->stencil[1].writemask = ctx->Stencil.WriteMask[back] & 0xff;
119 sr.ref_value[1] = _mesa_get_stencil_ref(ctx, back);
120 }
121 else {
122 /* This should be unnecessary. Drivers must not expect this to
123 * contain valid data, except the enabled bit
124 */
125 dsa->stencil[1] = dsa->stencil[0];
126 dsa->stencil[1].enabled = 0;
127 sr.ref_value[1] = sr.ref_value[0];
128 }
129 }
130
131 if (ctx->Color.AlphaEnabled && !st->lower_alpha_test &&
132 !(ctx->DrawBuffer->_IntegerBuffers & 0x1)) {
133 dsa->alpha_enabled = 1;
134 dsa->alpha_func = func_to_gallium(ctx->Color.AlphaFunc);
135 dsa->alpha_ref_value = ctx->Color.AlphaRefUnclamped;
136 }
137
138 cso_set_depth_stencil_alpha(st->cso_context, dsa);
139 cso_set_stencil_ref(st->cso_context, sr);
140 }
141