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  1. /**
  2.  * \file stencil.h
  3.  * Stencil operations.
  4.  */
  5.  
  6. /*
  7.  * Mesa 3-D graphics library
  8.  *
  9.  * Copyright (C) 1999-2007  Brian Paul   All Rights Reserved.
  10.  *
  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:
  17.  *
  18.  * The above copyright notice and this permission notice shall be included
  19.  * in all copies or substantial portions of the Software.
  20.  *
  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.
  28.  */
  29.  
  30.  
  31. #ifndef STENCIL_H
  32. #define STENCIL_H
  33.  
  34.  
  35. #include "glheader.h"
  36. #include "macros.h"
  37.  
  38. struct gl_context;
  39.  
  40. extern void GLAPIENTRY
  41. _mesa_ClearStencil( GLint s );
  42.  
  43.  
  44. extern void GLAPIENTRY
  45. _mesa_StencilFunc( GLenum func, GLint ref, GLuint mask );
  46.  
  47.  
  48. extern void GLAPIENTRY
  49. _mesa_StencilMask( GLuint mask );
  50.  
  51.  
  52. extern void GLAPIENTRY
  53. _mesa_StencilOp( GLenum fail, GLenum zfail, GLenum zpass );
  54.  
  55.  
  56. extern void GLAPIENTRY
  57. _mesa_ActiveStencilFaceEXT(GLenum face);
  58.  
  59.  
  60. extern void GLAPIENTRY
  61. _mesa_StencilOpSeparate(GLenum face, GLenum fail, GLenum zfail, GLenum zpass);
  62.  
  63.  
  64. extern void GLAPIENTRY
  65. _mesa_StencilFuncSeparate(GLenum face, GLenum func, GLint ref, GLuint mask);
  66.  
  67.  
  68. extern void GLAPIENTRY
  69. _mesa_StencilFuncSeparateATI(GLenum frontfunc, GLenum backfunc, GLint ref, GLuint mask);
  70.  
  71. extern void GLAPIENTRY
  72. _mesa_StencilMaskSeparate(GLenum face, GLuint mask);
  73.  
  74.  
  75. extern void
  76. _mesa_update_stencil(struct gl_context *ctx);
  77.  
  78.  
  79. extern void
  80. _mesa_init_stencil( struct gl_context * ctx );
  81.  
  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."
  86.  */
  87.  
  88. static inline GLint
  89. _mesa_get_stencil_ref(struct gl_context const *ctx, int face)
  90. {
  91.    GLint stencilMax = (1 << ctx->DrawBuffer->Visual.stencilBits) - 1;
  92.    GLint ref = ctx->Stencil.Ref[face];
  93.    return CLAMP(ref, 0, stencilMax);
  94. }
  95.  
  96. #endif
  97.