src/mesa/main/stencil.c

   1 /* $Id: stencil.c,v 1.27 2001/05/09 16:34:09 brianp Exp $ */
   2
   3 /*
   4  * Mesa 3-D graphics library
   5  * Version:  3.5
   6  *
   7  * Copyright (C) 1999-2001  Brian Paul   All Rights Reserved.
   8  *
   9  * Permission is hereby granted, free of charge, to any person obtaining a
  10  * copy of this software and associated documentation files (the "Software"),
  11  * to deal in the Software without restriction, including without limitation
  12  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  13  * and/or sell copies of the Software, and to permit persons to whom the
  14  * Software is furnished to do so, subject to the following conditions:
  15  *
  16  * The above copyright notice and this permission notice shall be included
  17  * in all copies or substantial portions of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  20  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  21  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  22  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  23  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  24  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  */
  26
  27
  28 #ifdef PC_HEADER
  29 #include "all.h"
  30 #else
  31 #include "glheader.h"
  32 #include "context.h"
  33 #include "depth.h"
  34 #include "macros.h"
  35 #include "mem.h"
  36 #include "stencil.h"
  37 #include "mtypes.h"
  38 #include "enable.h"
  39 #endif
  40
  41
  42
  43
  44 void
  45 _mesa_ClearStencil( GLint s )
  46 {
  47    GET_CURRENT_CONTEXT(ctx);
  48    ASSERT_OUTSIDE_BEGIN_END(ctx);
  49
  50    if (ctx->Stencil.Clear == (GLstencil) s)
  51       return;
  52
  53    FLUSH_VERTICES(ctx, _NEW_STENCIL);
  54    ctx->Stencil.Clear = (GLstencil) s;
  55
  56    if (ctx->Driver.ClearStencil) {
  57       (*ctx->Driver.ClearStencil)( ctx, s );
  58    }
  59 }
  60
  61
  62
  63 void
  64 _mesa_StencilFunc( GLenum func, GLint ref, GLuint mask )
  65 {
  66    GET_CURRENT_CONTEXT(ctx);
  67    GLint maxref;
  68    ASSERT_OUTSIDE_BEGIN_END(ctx);
  69
  70    switch (func) {
  71       case GL_NEVER:
  72       case GL_LESS:
  73       case GL_LEQUAL:
  74       case GL_GREATER:
  75       case GL_GEQUAL:
  76       case GL_EQUAL:
  77       case GL_NOTEQUAL:
  78       case GL_ALWAYS:
  79          break;
  80       default:
  81          _mesa_error( ctx, GL_INVALID_ENUM, "glStencilFunc" );
  82          return;
  83    }
  84
  85    maxref = (1 << STENCIL_BITS) - 1;
  86    ref = (GLstencil) CLAMP( ref, 0, maxref );
  87
  88    if (ctx->Stencil.Function == func &&
  89        ctx->Stencil.ValueMask == (GLstencil) mask &&
  90        ctx->Stencil.Ref == ref)
  91       return;
  92
  93    FLUSH_VERTICES(ctx, _NEW_STENCIL);
  94    ctx->Stencil.Function = func;
  95    ctx->Stencil.Ref = ref;
  96    ctx->Stencil.ValueMask = (GLstencil) mask;
  97
  98    if (ctx->Driver.StencilFunc) {
  99       (*ctx->Driver.StencilFunc)( ctx, func, ctx->Stencil.Ref, mask );
 100    }
 101 }
 102
 103
 104
 105 void
 106 _mesa_StencilMask( GLuint mask )
 107 {
 108    GET_CURRENT_CONTEXT(ctx);
 109    ASSERT_OUTSIDE_BEGIN_END(ctx);
 110
 111    if (ctx->Stencil.WriteMask == (GLstencil) mask)
 112          return;
 113
 114    FLUSH_VERTICES(ctx, _NEW_STENCIL);
 115    ctx->Stencil.WriteMask = (GLstencil) mask;
 116
 117    if (ctx->Driver.StencilMask) {
 118       (*ctx->Driver.StencilMask)( ctx, mask );
 119    }
 120 }
 121
 122
 123
 124 void
 125 _mesa_StencilOp(GLenum fail, GLenum zfail, GLenum zpass)
 126 {
 127    GET_CURRENT_CONTEXT(ctx);
 128    ASSERT_OUTSIDE_BEGIN_END(ctx);
 129
 130    switch (fail) {
 131       case GL_KEEP:
 132       case GL_ZERO:
 133       case GL_REPLACE:
 134       case GL_INCR:
 135       case GL_DECR:
 136       case GL_INVERT:
 137          break;
 138       case GL_INCR_WRAP_EXT:
 139       case GL_DECR_WRAP_EXT:
 140          if (!ctx->Extensions.EXT_stencil_wrap) {
 141             break;
 142          }
 143          /* FALL-THROUGH */
 144       default:
 145          _mesa_error(ctx, GL_INVALID_ENUM, "glStencilOp");
 146          return;
 147    }
 148    switch (zfail) {
 149       case GL_KEEP:
 150       case GL_ZERO:
 151       case GL_REPLACE:
 152       case GL_INCR:
 153       case GL_DECR:
 154       case GL_INVERT:
 155          break;
 156       case GL_INCR_WRAP_EXT:
 157       case GL_DECR_WRAP_EXT:
 158          if (ctx->Extensions.EXT_stencil_wrap) {
 159             break;
 160          }
 161          /* FALL-THROUGH */
 162       default:
 163          _mesa_error(ctx, GL_INVALID_ENUM, "glStencilOp");
 164          return;
 165    }
 166    switch (zpass) {
 167       case GL_KEEP:
 168       case GL_ZERO:
 169       case GL_REPLACE:
 170       case GL_INCR:
 171       case GL_DECR:
 172       case GL_INVERT:
 173          break;
 174       case GL_INCR_WRAP_EXT:
 175       case GL_DECR_WRAP_EXT:
 176          if (ctx->Extensions.EXT_stencil_wrap) {
 177             break;
 178          }
 179          /* FALL-THROUGH */
 180       default:
 181          _mesa_error(ctx, GL_INVALID_ENUM, "glStencilOp");
 182          return;
 183    }
 184
 185    if (ctx->Stencil.ZFailFunc == zfail &&
 186        ctx->Stencil.ZPassFunc == zpass &&
 187        ctx->Stencil.FailFunc == fail)
 188       return;
 189
 190    FLUSH_VERTICES(ctx, _NEW_STENCIL);
 191    ctx->Stencil.ZFailFunc = zfail;
 192    ctx->Stencil.ZPassFunc = zpass;
 193    ctx->Stencil.FailFunc = fail;
 194
 195    if (ctx->Driver.StencilOp) {
 196       (*ctx->Driver.StencilOp)(ctx, fail, zfail, zpass);
 197    }
 198 }