/** * \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" struct gl_context; extern void GLAPIENTRY _mesa_ClearStencil( GLint s ); extern void GLAPIENTRY _mesa_StencilFunc( GLenum func, GLint ref, GLuint mask ); extern void GLAPIENTRY _mesa_StencilMask( GLuint mask ); extern void GLAPIENTRY _mesa_StencilOp( GLenum fail, GLenum zfail, GLenum zpass ); extern void GLAPIENTRY _mesa_ActiveStencilFaceEXT(GLenum face); extern void GLAPIENTRY _mesa_StencilOpSeparate(GLenum face, GLenum fail, GLenum zfail, GLenum zpass); 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); extern void GLAPIENTRY _mesa_StencilMaskSeparate(GLenum face, GLuint mask); extern void _mesa_update_stencil(struct gl_context *ctx); 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); } #endif