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55 pj 1
/* $Id: stencil.c,v 1.1 2003-02-28 11:42:04 pj Exp $ */
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/*
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 * Mesa 3-D graphics library
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 * Version:  4.1
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 *
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 * Copyright (C) 1999-2002  Brian Paul   All Rights Reserved.
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 *
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 * Permission is hereby granted, free of charge, to any person obtaining a
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 * copy of this software and associated documentation files (the "Software"),
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 * to deal in the Software without restriction, including without limitation
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 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
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 * and/or sell copies of the Software, and to permit persons to whom the
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 * Software is furnished to do so, subject to the following conditions:
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 *
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 * The above copyright notice and this permission notice shall be included
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 * in all copies or substantial portions of the Software.
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 *
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 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
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 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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 */
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#include "glheader.h"
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#include "imports.h"
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#include "context.h"
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#include "depth.h"
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#include "macros.h"
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#include "stencil.h"
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#include "mtypes.h"
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#include "enable.h"
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void
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_mesa_ClearStencil( GLint s )
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{
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   GET_CURRENT_CONTEXT(ctx);
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   ASSERT_OUTSIDE_BEGIN_END(ctx);
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   if (ctx->Stencil.Clear == (GLstencil) s)
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      return;
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   FLUSH_VERTICES(ctx, _NEW_STENCIL);
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   ctx->Stencil.Clear = (GLstencil) s;
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   if (ctx->Driver.ClearStencil) {
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      (*ctx->Driver.ClearStencil)( ctx, s );
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   }
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}
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void
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_mesa_StencilFunc( GLenum func, GLint ref, GLuint mask )
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{
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   GET_CURRENT_CONTEXT(ctx);
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   const GLint face = ctx->Stencil.ActiveFace;
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   GLint maxref;
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   ASSERT_OUTSIDE_BEGIN_END(ctx);
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   switch (func) {
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      case GL_NEVER:
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      case GL_LESS:
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      case GL_LEQUAL:
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      case GL_GREATER:
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      case GL_GEQUAL:
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      case GL_EQUAL:
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      case GL_NOTEQUAL:
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      case GL_ALWAYS:
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         break;
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      default:
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         _mesa_error( ctx, GL_INVALID_ENUM, "glStencilFunc" );
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         return;
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   }
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   maxref = (1 << STENCIL_BITS) - 1;
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   ref = (GLstencil) CLAMP( ref, 0, maxref );
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   if (ctx->Stencil.Function[face] == func &&
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       ctx->Stencil.ValueMask[face] == (GLstencil) mask &&
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       ctx->Stencil.Ref[face] == ref)
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      return;
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   FLUSH_VERTICES(ctx, _NEW_STENCIL);
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   ctx->Stencil.Function[face] = func;
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   ctx->Stencil.Ref[face] = ref;
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   ctx->Stencil.ValueMask[face] = (GLstencil) mask;
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   if (ctx->Driver.StencilFunc) {
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      (*ctx->Driver.StencilFunc)( ctx, func, ref, mask );
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   }
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}
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void
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_mesa_StencilMask( GLuint mask )
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{
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   GET_CURRENT_CONTEXT(ctx);
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   const GLint face = ctx->Stencil.ActiveFace;
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   ASSERT_OUTSIDE_BEGIN_END(ctx);
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   if (ctx->Stencil.WriteMask[face] == (GLstencil) mask)
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      return;
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   FLUSH_VERTICES(ctx, _NEW_STENCIL);
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   ctx->Stencil.WriteMask[face] = (GLstencil) mask;
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   if (ctx->Driver.StencilMask) {
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      (*ctx->Driver.StencilMask)( ctx, mask );
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   }
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}
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void
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_mesa_StencilOp(GLenum fail, GLenum zfail, GLenum zpass)
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{
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   GET_CURRENT_CONTEXT(ctx);
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   const GLint face = ctx->Stencil.ActiveFace;
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   ASSERT_OUTSIDE_BEGIN_END(ctx);
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   switch (fail) {
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      case GL_KEEP:
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      case GL_ZERO:
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      case GL_REPLACE:
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      case GL_INCR:
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      case GL_DECR:
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      case GL_INVERT:
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         break;
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      case GL_INCR_WRAP_EXT:
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      case GL_DECR_WRAP_EXT:
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         if (!ctx->Extensions.EXT_stencil_wrap) {
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            break;
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         }
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         /* FALL-THROUGH */
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      default:
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         _mesa_error(ctx, GL_INVALID_ENUM, "glStencilOp");
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         return;
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   }
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   switch (zfail) {
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      case GL_KEEP:
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      case GL_ZERO:
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      case GL_REPLACE:
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      case GL_INCR:
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      case GL_DECR:
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      case GL_INVERT:
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         break;
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      case GL_INCR_WRAP_EXT:
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      case GL_DECR_WRAP_EXT:
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         if (ctx->Extensions.EXT_stencil_wrap) {
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            break;
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         }
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         /* FALL-THROUGH */
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      default:
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         _mesa_error(ctx, GL_INVALID_ENUM, "glStencilOp");
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         return;
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   }
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   switch (zpass) {
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      case GL_KEEP:
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      case GL_ZERO:
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      case GL_REPLACE:
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      case GL_INCR:
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      case GL_DECR:
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      case GL_INVERT:
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         break;
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      case GL_INCR_WRAP_EXT:
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      case GL_DECR_WRAP_EXT:
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         if (ctx->Extensions.EXT_stencil_wrap) {
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            break;
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         }
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         /* FALL-THROUGH */
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      default:
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         _mesa_error(ctx, GL_INVALID_ENUM, "glStencilOp");
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         return;
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   }
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   if (ctx->Stencil.ZFailFunc[face] == zfail &&
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       ctx->Stencil.ZPassFunc[face] == zpass &&
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       ctx->Stencil.FailFunc[face] == fail)
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      return;
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   FLUSH_VERTICES(ctx, _NEW_STENCIL);
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   ctx->Stencil.ZFailFunc[face] = zfail;
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   ctx->Stencil.ZPassFunc[face] = zpass;
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   ctx->Stencil.FailFunc[face] = fail;
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192
   if (ctx->Driver.StencilOp) {
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      (*ctx->Driver.StencilOp)(ctx, fail, zfail, zpass);
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   }
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}
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/* GL_EXT_stencil_two_side */
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void
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_mesa_ActiveStencilFaceEXT(GLenum face)
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{
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   GET_CURRENT_CONTEXT(ctx);
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   ASSERT_OUTSIDE_BEGIN_END(ctx);
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205
   if (face == GL_FRONT || face == GL_BACK) {
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      FLUSH_VERTICES(ctx, _NEW_STENCIL);
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      ctx->Stencil.ActiveFace = (face == GL_FRONT) ? 0 : 1;
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   }
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   if (ctx->Driver.ActiveStencilFace) {
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      (*ctx->Driver.ActiveStencilFace)( ctx, (GLuint) ctx->Stencil.ActiveFace );
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   }
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}
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