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/* $Id: clip.c,v 1.20 2001/03/03 20:33:27 brianp Exp $ */
/*
* Mesa 3-D graphics library
* Version: 3.3
*
* Copyright (C) 1999 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 "clip.h"
#include "context.h"
#include "macros.h"
#include "mmath.h"
#include "mtypes.h"
#include "math/m_xform.h"
#include "math/m_matrix.h"
#endif
/**********************************************************************/
/* Get/Set User clip-planes. */
/**********************************************************************/
void
_mesa_ClipPlane( GLenum plane, const GLdouble *eq )
{
GET_CURRENT_CONTEXT(ctx);
GLint p;
GLfloat equation[4];
ASSERT_OUTSIDE_BEGIN_END(ctx);
p = (GLint) plane - (GLint) GL_CLIP_PLANE0;
if (p < 0 || p >= ctx->Const.MaxClipPlanes) {
_mesa_error( ctx, GL_INVALID_ENUM, "glClipPlane" );
return;
}
equation[0] = eq[0];
equation[1] = eq[1];
equation[2] = eq[2];
equation[3] = eq[3];
/*
* The equation is transformed by the transpose of the inverse of the
* current modelview matrix and stored in the resulting eye coordinates.
*
* KW: Eqn is then transformed to the current clip space, where user
* clipping now takes place. The clip-space equations are recalculated
* whenever the projection matrix changes.
*/
if (ctx->ModelView.flags & MAT_DIRTY)
_math_matrix_analyse( &ctx->ModelView );
_mesa_transform_vector( equation, equation, ctx->ModelView.inv );
if (TEST_EQ_4V(ctx->Transform.EyeUserPlane[p], equation))
return;
FLUSH_VERTICES(ctx, _NEW_TRANSFORM);
COPY_4FV(ctx->Transform.EyeUserPlane[p], equation);
/* Update derived state. This state also depends on the projection
* matrix, and is recalculated on changes to the projection matrix by
* code in _mesa_update_state().
*/
if (ctx->Transform.ClipEnabled[p]) {
if (ctx->ProjectionMatrix.flags & MAT_DIRTY)
_math_matrix_analyse( &ctx->ProjectionMatrix );
_mesa_transform_vector( ctx->Transform._ClipUserPlane[p],
ctx->Transform.EyeUserPlane[p],
ctx->ProjectionMatrix.inv );
}
if (ctx->Driver.ClipPlane)
ctx->Driver.ClipPlane( ctx, plane, equation );
}
void
_mesa_GetClipPlane( GLenum plane, GLdouble *equation )
{
GET_CURRENT_CONTEXT(ctx);
GLint p;
ASSERT_OUTSIDE_BEGIN_END(ctx);
p = (GLint) (plane - GL_CLIP_PLANE0);
if (p < 0 || p >= ctx->Const.MaxClipPlanes) {
_mesa_error( ctx, GL_INVALID_ENUM, "glGetClipPlane" );
return;
}
equation[0] = (GLdouble) ctx->Transform.EyeUserPlane[p][0];
equation[1] = (GLdouble) ctx->Transform.EyeUserPlane[p][1];
equation[2] = (GLdouble) ctx->Transform.EyeUserPlane[p][2];
equation[3] = (GLdouble) ctx->Transform.EyeUserPlane[p][3];
}
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