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/* $Id: stencil.c,v 1.28 2002/09/06 02:56:09 brianp Exp $ */
/*
* Mesa 3-D graphics library
* Version: 4.1
*
* Copyright (C) 1999-2002 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
* BRIAN PAUL 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.
*/
#ifdef PC_HEADER
#include "all.h"
#else
#include "glheader.h"
#include "context.h"
#include "depth.h"
#include "macros.h"
#include "mem.h"
#include "stencil.h"
#include "mtypes.h"
#include "enable.h"
#endif
void
_mesa_ClearStencil( GLint s )
{
GET_CURRENT_CONTEXT(ctx);
ASSERT_OUTSIDE_BEGIN_END(ctx);
if (ctx->Stencil.Clear == (GLstencil) s)
return;
FLUSH_VERTICES(ctx, _NEW_STENCIL);
ctx->Stencil.Clear = (GLstencil) s;
if (ctx->Driver.ClearStencil) {
(*ctx->Driver.ClearStencil)( ctx, s );
}
}
void
_mesa_StencilFunc( GLenum func, GLint ref, GLuint mask )
{
GET_CURRENT_CONTEXT(ctx);
const GLint face = ctx->Stencil.ActiveFace;
GLint maxref;
ASSERT_OUTSIDE_BEGIN_END(ctx);
switch (func) {
case GL_NEVER:
case GL_LESS:
case GL_LEQUAL:
case GL_GREATER:
case GL_GEQUAL:
case GL_EQUAL:
case GL_NOTEQUAL:
case GL_ALWAYS:
break;
default:
_mesa_error( ctx, GL_INVALID_ENUM, "glStencilFunc" );
return;
}
maxref = (1 << STENCIL_BITS) - 1;
ref = (GLstencil) CLAMP( ref, 0, maxref );
if (ctx->Stencil.Function[face] == func &&
ctx->Stencil.ValueMask[face] == (GLstencil) mask &&
ctx->Stencil.Ref[face] == ref)
return;
FLUSH_VERTICES(ctx, _NEW_STENCIL);
ctx->Stencil.Function[face] = func;
ctx->Stencil.Ref[face] = ref;
ctx->Stencil.ValueMask[face] = (GLstencil) mask;
if (ctx->Driver.StencilFunc) {
(*ctx->Driver.StencilFunc)( ctx, func, ref, mask );
}
}
void
_mesa_StencilMask( GLuint mask )
{
GET_CURRENT_CONTEXT(ctx);
const GLint face = ctx->Stencil.ActiveFace;
ASSERT_OUTSIDE_BEGIN_END(ctx);
if (ctx->Stencil.WriteMask[face] == (GLstencil) mask)
return;
FLUSH_VERTICES(ctx, _NEW_STENCIL);
ctx->Stencil.WriteMask[face] = (GLstencil) mask;
if (ctx->Driver.StencilMask) {
(*ctx->Driver.StencilMask)( ctx, mask );
}
}
void
_mesa_StencilOp(GLenum fail, GLenum zfail, GLenum zpass)
{
GET_CURRENT_CONTEXT(ctx);
const GLint face = ctx->Stencil.ActiveFace;
ASSERT_OUTSIDE_BEGIN_END(ctx);
switch (fail) {
case GL_KEEP:
case GL_ZERO:
case GL_REPLACE:
case GL_INCR:
case GL_DECR:
case GL_INVERT:
break;
case GL_INCR_WRAP_EXT:
case GL_DECR_WRAP_EXT:
if (!ctx->Extensions.EXT_stencil_wrap) {
break;
}
/* FALL-THROUGH */
default:
_mesa_error(ctx, GL_INVALID_ENUM, "glStencilOp");
return;
}
switch (zfail) {
case GL_KEEP:
case GL_ZERO:
case GL_REPLACE:
case GL_INCR:
case GL_DECR:
case GL_INVERT:
break;
case GL_INCR_WRAP_EXT:
case GL_DECR_WRAP_EXT:
if (ctx->Extensions.EXT_stencil_wrap) {
break;
}
/* FALL-THROUGH */
default:
_mesa_error(ctx, GL_INVALID_ENUM, "glStencilOp");
return;
}
switch (zpass) {
case GL_KEEP:
case GL_ZERO:
case GL_REPLACE:
case GL_INCR:
case GL_DECR:
case GL_INVERT:
break;
case GL_INCR_WRAP_EXT:
case GL_DECR_WRAP_EXT:
if (ctx->Extensions.EXT_stencil_wrap) {
break;
}
/* FALL-THROUGH */
default:
_mesa_error(ctx, GL_INVALID_ENUM, "glStencilOp");
return;
}
if (ctx->Stencil.ZFailFunc[face] == zfail &&
ctx->Stencil.ZPassFunc[face] == zpass &&
ctx->Stencil.FailFunc[face] == fail)
return;
FLUSH_VERTICES(ctx, _NEW_STENCIL);
ctx->Stencil.ZFailFunc[face] = zfail;
ctx->Stencil.ZPassFunc[face] = zpass;
ctx->Stencil.FailFunc[face] = fail;
if (ctx->Driver.StencilOp) {
(*ctx->Driver.StencilOp)(ctx, fail, zfail, zpass);
}
}
/* GL_EXT_stencil_two_side */
void
_mesa_ActiveStencilFaceEXT(GLenum face)
{
GET_CURRENT_CONTEXT(ctx);
ASSERT_OUTSIDE_BEGIN_END(ctx);
if (face == GL_FRONT || face == GL_BACK) {
FLUSH_VERTICES(ctx, _NEW_STENCIL);
ctx->Stencil.ActiveFace = (face == GL_FRONT) ? 0 : 1;
}
if (ctx->Driver.ActiveStencilFace) {
(*ctx->Driver.ActiveStencilFace)( ctx, (GLuint) ctx->Stencil.ActiveFace );
}
}
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