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
);
44 extern void GLAPIENTRY
45 _mesa_StencilFunc( GLenum func
, GLint ref
, GLuint mask
);
48 extern void GLAPIENTRY
49 _mesa_StencilMask( GLuint mask
);
52 extern void GLAPIENTRY
53 _mesa_StencilOp( GLenum fail
, GLenum zfail
, GLenum zpass
);
56 extern void GLAPIENTRY
57 _mesa_ActiveStencilFaceEXT(GLenum face
);
60 extern void GLAPIENTRY
61 _mesa_StencilOpSeparate(GLenum face
, GLenum fail
, GLenum zfail
, GLenum zpass
);
64 extern void GLAPIENTRY
65 _mesa_StencilFuncSeparate(GLenum face
, GLenum func
, GLint ref
, GLuint mask
);
68 extern void GLAPIENTRY
69 _mesa_StencilFuncSeparateATI(GLenum frontfunc
, GLenum backfunc
, GLint ref
, GLuint mask
);
71 extern void GLAPIENTRY
72 _mesa_StencilMaskSeparate(GLenum face
, GLuint mask
);
76 _mesa_update_stencil(struct gl_context
*ctx
);
80 _mesa_init_stencil( struct gl_context
* ctx
);
82 /* From the GL 4.3 spec, 17.3.5:
83 * "Stencil comparison operations and queries of <ref> clamp its value
84 * to the range [0, 2^s-1], where <s> is the number of bits in the
85 * stencil buffer attached to the draw framebuffer."
89 _mesa_get_stencil_ref(struct gl_context
const *ctx
, int face
)
91 GLint stencilMax
= (1 << ctx
->DrawBuffer
->Visual
.stencilBits
) - 1;
92 GLint ref
= ctx
->Stencil
.Ref
[face
];
93 return CLAMP(ref
, 0, stencilMax
);