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/**
* \file stencil.h
* Stencil operations.
*/
/*
* Mesa 3-D graphics library
*
* Copyright (C) 1999-2007 Brian Paul All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*/
#ifndef STENCIL_H
#define STENCIL_H
#include "glheader.h"
#include "macros.h"
struct gl_context;
extern void GLAPIENTRY
_mesa_ClearStencil( GLint s );
void GLAPIENTRY
_mesa_StencilFunc_no_error(GLenum func, GLint ref, GLuint mask);
extern void GLAPIENTRY
_mesa_StencilFunc(GLenum func, GLint ref, GLuint mask);
extern void GLAPIENTRY
_mesa_StencilMask( GLuint mask );
void GLAPIENTRY
_mesa_StencilOp_no_error(GLenum fail, GLenum zfail, GLenum zpass);
extern void GLAPIENTRY
_mesa_StencilOp(GLenum fail, GLenum zfail, GLenum zpass);
extern void GLAPIENTRY
_mesa_ActiveStencilFaceEXT(GLenum face);
void GLAPIENTRY
_mesa_StencilOpSeparate_no_error(GLenum face, GLenum fail, GLenum zfail,
GLenum zpass);
extern void GLAPIENTRY
_mesa_StencilOpSeparate(GLenum face, GLenum fail, GLenum zfail, GLenum zpass);
void GLAPIENTRY
_mesa_StencilFuncSeparate_no_error(GLenum face, GLenum func, GLint ref,
GLuint mask);
extern void GLAPIENTRY
_mesa_StencilFuncSeparate(GLenum face, GLenum func, GLint ref, GLuint mask);
extern void GLAPIENTRY
_mesa_StencilFuncSeparateATI(GLenum frontfunc, GLenum backfunc, GLint ref, GLuint mask);
void GLAPIENTRY
_mesa_StencilMaskSeparate_no_error(GLenum face, GLuint mask);
extern void GLAPIENTRY
_mesa_StencilMaskSeparate(GLenum face, GLuint mask);
extern void
_mesa_init_stencil( struct gl_context * ctx );
/* From the GL 4.3 spec, 17.3.5:
* "Stencil comparison operations and queries of <ref> clamp its value
* to the range [0, 2^s-1], where <s> is the number of bits in the
* stencil buffer attached to the draw framebuffer."
*/
static inline GLint
_mesa_get_stencil_ref(struct gl_context const *ctx, int face)
{
GLint stencilMax = (1 << ctx->DrawBuffer->Visual.stencilBits) - 1;
GLint ref = ctx->Stencil.Ref[face];
return CLAMP(ref, 0, stencilMax);
}
static inline bool
_mesa_stencil_is_enabled(const struct gl_context *ctx)
{
return ctx->Stencil.Enabled &&
ctx->DrawBuffer->Visual.stencilBits > 0;
}
static inline bool
_mesa_stencil_is_two_sided(const struct gl_context *ctx)
{
const int face = ctx->Stencil._BackFace;
return _mesa_stencil_is_enabled(ctx) &&
(ctx->Stencil.Function[0] != ctx->Stencil.Function[face] ||
ctx->Stencil.FailFunc[0] != ctx->Stencil.FailFunc[face] ||
ctx->Stencil.ZPassFunc[0] != ctx->Stencil.ZPassFunc[face] ||
ctx->Stencil.ZFailFunc[0] != ctx->Stencil.ZFailFunc[face] ||
ctx->Stencil.Ref[0] != ctx->Stencil.Ref[face] ||
ctx->Stencil.ValueMask[0] != ctx->Stencil.ValueMask[face] ||
ctx->Stencil.WriteMask[0] != ctx->Stencil.WriteMask[face]);
}
static inline bool
_mesa_stencil_is_write_enabled(const struct gl_context *ctx, bool is_two_sided)
{
return _mesa_stencil_is_enabled(ctx) &&
(ctx->Stencil.WriteMask[0] != 0 ||
(is_two_sided &&
ctx->Stencil.WriteMask[ctx->Stencil._BackFace] != 0));
}
#endif
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