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
44 #include "main/core.h"
45 #include "main/stencil.h"
46
47
48 /**
49 * Convert an OpenGL compare mode to a pipe tokens.
50 */
51 GLuint
st_compare_func_to_pipe(GLenum func)52 st_compare_func_to_pipe(GLenum func)
53 {
54 /* Same values, just biased */
55 STATIC_ASSERT(PIPE_FUNC_NEVER == GL_NEVER - GL_NEVER);
56 STATIC_ASSERT(PIPE_FUNC_LESS == GL_LESS - GL_NEVER);
57 STATIC_ASSERT(PIPE_FUNC_EQUAL == GL_EQUAL - GL_NEVER);
58 STATIC_ASSERT(PIPE_FUNC_LEQUAL == GL_LEQUAL - GL_NEVER);
59 STATIC_ASSERT(PIPE_FUNC_GREATER == GL_GREATER - GL_NEVER);
60 STATIC_ASSERT(PIPE_FUNC_NOTEQUAL == GL_NOTEQUAL - GL_NEVER);
61 STATIC_ASSERT(PIPE_FUNC_GEQUAL == GL_GEQUAL - GL_NEVER);
62 STATIC_ASSERT(PIPE_FUNC_ALWAYS == GL_ALWAYS - GL_NEVER);
63 assert(func >= GL_NEVER);
64 assert(func <= GL_ALWAYS);
65 return func - GL_NEVER;
66 }
67
68
69 /**
70 * Convert GLenum stencil op tokens to pipe tokens.
71 */
72 static GLuint
gl_stencil_op_to_pipe(GLenum func)73 gl_stencil_op_to_pipe(GLenum func)
74 {
75 switch (func) {
76 case GL_KEEP:
77 return PIPE_STENCIL_OP_KEEP;
78 case GL_ZERO:
79 return PIPE_STENCIL_OP_ZERO;
80 case GL_REPLACE:
81 return PIPE_STENCIL_OP_REPLACE;
82 case GL_INCR:
83 return PIPE_STENCIL_OP_INCR;
84 case GL_DECR:
85 return PIPE_STENCIL_OP_DECR;
86 case GL_INCR_WRAP:
87 return PIPE_STENCIL_OP_INCR_WRAP;
88 case GL_DECR_WRAP:
89 return PIPE_STENCIL_OP_DECR_WRAP;
90 case GL_INVERT:
91 return PIPE_STENCIL_OP_INVERT;
92 default:
93 assert("invalid GL token in gl_stencil_op_to_pipe()" == NULL);
94 return 0;
95 }
96 }
97
98 void
st_update_depth_stencil_alpha(struct st_context * st)99 st_update_depth_stencil_alpha(struct st_context *st)
100 {
101 struct pipe_depth_stencil_alpha_state *dsa = &st->state.depth_stencil;
102 struct pipe_stencil_ref sr;
103 struct gl_context *ctx = st->ctx;
104
105 memset(dsa, 0, sizeof(*dsa));
106 memset(&sr, 0, sizeof(sr));
107
108 if (ctx->DrawBuffer->Visual.depthBits > 0) {
109 if (ctx->Depth.Test) {
110 dsa->depth.enabled = 1;
111 dsa->depth.writemask = ctx->Depth.Mask;
112 dsa->depth.func = st_compare_func_to_pipe(ctx->Depth.Func);
113 }
114 if (ctx->Depth.BoundsTest) {
115 dsa->depth.bounds_test = 1;
116 dsa->depth.bounds_min = ctx->Depth.BoundsMin;
117 dsa->depth.bounds_max = ctx->Depth.BoundsMax;
118 }
119 }
120
121 if (ctx->Stencil.Enabled && ctx->DrawBuffer->Visual.stencilBits > 0) {
122 dsa->stencil[0].enabled = 1;
123 dsa->stencil[0].func = st_compare_func_to_pipe(ctx->Stencil.Function[0]);
124 dsa->stencil[0].fail_op = gl_stencil_op_to_pipe(ctx->Stencil.FailFunc[0]);
125 dsa->stencil[0].zfail_op = gl_stencil_op_to_pipe(ctx->Stencil.ZFailFunc[0]);
126 dsa->stencil[0].zpass_op = gl_stencil_op_to_pipe(ctx->Stencil.ZPassFunc[0]);
127 dsa->stencil[0].valuemask = ctx->Stencil.ValueMask[0] & 0xff;
128 dsa->stencil[0].writemask = ctx->Stencil.WriteMask[0] & 0xff;
129 sr.ref_value[0] = _mesa_get_stencil_ref(ctx, 0);
130
131 if (_mesa_stencil_is_two_sided(ctx)) {
132 const GLuint back = ctx->Stencil._BackFace;
133 dsa->stencil[1].enabled = 1;
134 dsa->stencil[1].func = st_compare_func_to_pipe(ctx->Stencil.Function[back]);
135 dsa->stencil[1].fail_op = gl_stencil_op_to_pipe(ctx->Stencil.FailFunc[back]);
136 dsa->stencil[1].zfail_op = gl_stencil_op_to_pipe(ctx->Stencil.ZFailFunc[back]);
137 dsa->stencil[1].zpass_op = gl_stencil_op_to_pipe(ctx->Stencil.ZPassFunc[back]);
138 dsa->stencil[1].valuemask = ctx->Stencil.ValueMask[back] & 0xff;
139 dsa->stencil[1].writemask = ctx->Stencil.WriteMask[back] & 0xff;
140 sr.ref_value[1] = _mesa_get_stencil_ref(ctx, back);
141 }
142 else {
143 /* This should be unnecessary. Drivers must not expect this to
144 * contain valid data, except the enabled bit
145 */
146 dsa->stencil[1] = dsa->stencil[0];
147 dsa->stencil[1].enabled = 0;
148 sr.ref_value[1] = sr.ref_value[0];
149 }
150 }
151
152 if (ctx->Color.AlphaEnabled &&
153 !(ctx->DrawBuffer->_IntegerBuffers & 0x1)) {
154 dsa->alpha.enabled = 1;
155 dsa->alpha.func = st_compare_func_to_pipe(ctx->Color.AlphaFunc);
156 dsa->alpha.ref_value = ctx->Color.AlphaRefUnclamped;
157 }
158
159 cso_set_depth_stencil_alpha(st->cso_context, dsa);
160 cso_set_stencil_ref(st->cso_context, &sr);
161 }
162