7 * Mesa 3-D graphics library
9 * Copyright (C) 1999-2007 Brian Paul All Rights Reserved.
11 * Permission is hereby granted, free of charge, to any person obtaining a
12 * copy of this software and associated documentation files (the "Software"),
13 * to deal in the Software without restriction, including without limitation
14 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
15 * and/or sell copies of the Software, and to permit persons to whom the
16 * Software is furnished to do so, subject to the following conditions:
18 * The above copyright notice and this permission notice shall be included
19 * in all copies or substantial portions of the Software.
21 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
22 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
23 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
24 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
25 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
26 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
27 * OTHER DEALINGS IN THE SOFTWARE.
40 extern void GLAPIENTRY
41 _mesa_ClearStencil( GLint s
);
45 _mesa_StencilFunc_no_error(GLenum func
, GLint ref
, GLuint mask
);
47 extern void GLAPIENTRY
48 _mesa_StencilFunc(GLenum func
, GLint ref
, GLuint mask
);
51 extern void GLAPIENTRY
52 _mesa_StencilMask( GLuint mask
);
55 _mesa_StencilOp_no_error(GLenum fail
, GLenum zfail
, GLenum zpass
);
57 extern void GLAPIENTRY
58 _mesa_StencilOp(GLenum fail
, GLenum zfail
, GLenum zpass
);
61 extern void GLAPIENTRY
62 _mesa_ActiveStencilFaceEXT(GLenum face
);
65 _mesa_StencilOpSeparate_no_error(GLenum face
, GLenum fail
, GLenum zfail
,
68 extern void GLAPIENTRY
69 _mesa_StencilOpSeparate(GLenum face
, GLenum fail
, GLenum zfail
, GLenum zpass
);
73 _mesa_StencilFuncSeparate_no_error(GLenum face
, GLenum func
, GLint ref
,
76 extern void GLAPIENTRY
77 _mesa_StencilFuncSeparate(GLenum face
, GLenum func
, GLint ref
, GLuint mask
);
80 extern void GLAPIENTRY
81 _mesa_StencilFuncSeparateATI(GLenum frontfunc
, GLenum backfunc
, GLint ref
, GLuint mask
);
84 _mesa_StencilMaskSeparate_no_error(GLenum face
, GLuint mask
);
86 extern void GLAPIENTRY
87 _mesa_StencilMaskSeparate(GLenum face
, GLuint mask
);
90 _mesa_init_stencil( struct gl_context
* ctx
);
92 /* From the GL 4.3 spec, 17.3.5:
93 * "Stencil comparison operations and queries of <ref> clamp its value
94 * to the range [0, 2^s-1], where <s> is the number of bits in the
95 * stencil buffer attached to the draw framebuffer."
99 _mesa_get_stencil_ref(struct gl_context
const *ctx
, int face
)
101 GLint stencilMax
= (1 << ctx
->DrawBuffer
->Visual
.stencilBits
) - 1;
102 GLint ref
= ctx
->Stencil
.Ref
[face
];
103 return CLAMP(ref
, 0, stencilMax
);
107 _mesa_stencil_is_enabled(const struct gl_context
*ctx
)
109 return ctx
->Stencil
.Enabled
&&
110 ctx
->DrawBuffer
->Visual
.stencilBits
> 0;
114 _mesa_stencil_is_two_sided(const struct gl_context
*ctx
)
116 const int face
= ctx
->Stencil
._BackFace
;
118 return _mesa_stencil_is_enabled(ctx
) &&
119 (ctx
->Stencil
.Function
[0] != ctx
->Stencil
.Function
[face
] ||
120 ctx
->Stencil
.FailFunc
[0] != ctx
->Stencil
.FailFunc
[face
] ||
121 ctx
->Stencil
.ZPassFunc
[0] != ctx
->Stencil
.ZPassFunc
[face
] ||
122 ctx
->Stencil
.ZFailFunc
[0] != ctx
->Stencil
.ZFailFunc
[face
] ||
123 ctx
->Stencil
.Ref
[0] != ctx
->Stencil
.Ref
[face
] ||
124 ctx
->Stencil
.ValueMask
[0] != ctx
->Stencil
.ValueMask
[face
] ||
125 ctx
->Stencil
.WriteMask
[0] != ctx
->Stencil
.WriteMask
[face
]);
129 _mesa_stencil_is_write_enabled(const struct gl_context
*ctx
, bool is_two_sided
)
131 return _mesa_stencil_is_enabled(ctx
) &&
132 (ctx
->Stencil
.WriteMask
[0] != 0 ||
134 ctx
->Stencil
.WriteMask
[ctx
->Stencil
._BackFace
] != 0));