ImathGL.h

//
// SPDX-License-Identifier: BSD-3-Clause
// Copyright Contributors to the OpenEXR Project.
//
 
//
// Convenience functions that call GL with Imath types
//
 
#ifndef INCLUDED_ATOMSMATHGL_H
#define INCLUDED_ATOMSMATHGL_H
 
#include <GL/gl.h>
 
#include <AtomsMath/ImathFun.h>
#include <AtomsMath/ImathMatrix.h>
#include <AtomsMath/ImathNamespace.h>
#include <AtomsMath/ImathVec.h>
 
inline void
glVertex (const ATOMSMATH_INTERNAL_NAMESPACE::V3f& v)
{
    glVertex3f (v.x, v.y, v.z);
}
 
inline void
glVertex (const ATOMSMATH_INTERNAL_NAMESPACE::V2f& v)
{
    glVertex2f (v.x, v.y);
}
 
inline void
glNormal (const ATOMSMATH_INTERNAL_NAMESPACE::V3f& n)
{
    glNormal3f (n.x, n.y, n.z);
}
 
inline void
glColor (const ATOMSMATH_INTERNAL_NAMESPACE::V3f& c)
{
    glColor3f (c.x, c.y, c.z);
}
 
inline void
glTranslate (const ATOMSMATH_INTERNAL_NAMESPACE::V3f& t)
{
    glTranslatef (t.x, t.y, t.z);
}
 
inline void
glTexCoord (const ATOMSMATH_INTERNAL_NAMESPACE::V2f& t)
{
    glTexCoord2f (t.x, t.y);
}
 
inline void
glDisableTexture()
{
    glActiveTexture (GL_TEXTURE1);
    glBindTexture (GL_TEXTURE_2D, 0);
    glDisable (GL_TEXTURE_2D);
 
    glActiveTexture (GL_TEXTURE0);
}
 
namespace
{
 
const float GL_FLOAT_MAX = 1.8e+19; // sqrt (FLT_MAX)
 
inline bool
badFloat (float f)
{
    return !ATOMSMATH_INTERNAL_NAMESPACE::finitef (f) || f < -GL_FLOAT_MAX || f > GL_FLOAT_MAX;
}
 
} // namespace
 
inline void
throwBadMatrix (const ATOMSMATH_INTERNAL_NAMESPACE::M44f& m)
{
#ifdef ATOMS_USE_EXCEPTIONS
    if (badFloat (m[0][0]) || badFloat (m[0][1]) || badFloat (m[0][2]) || badFloat (m[0][3]) ||
        badFloat (m[1][0]) || badFloat (m[1][1]) || badFloat (m[1][2]) || badFloat (m[1][3]) ||
        badFloat (m[2][0]) || badFloat (m[2][1]) || badFloat (m[2][2]) || badFloat (m[2][3]) ||
        badFloat (m[3][0]) || badFloat (m[3][1]) || badFloat (m[3][2]) || badFloat (m[3][3]))
        throw std::invalid_argument ("GL matrix overflow");
#endif
}
 
inline void
glMultMatrix (const ATOMSMATH_INTERNAL_NAMESPACE::M44f& m)
{
    throwBadMatrix (m);
    glMultMatrixf ((GLfloat*) m[0]);
}
 
inline void
glMultMatrix (const ATOMSMATH_INTERNAL_NAMESPACE::M44f* m)
{
    throwBadMatrix (*m);
    glMultMatrixf ((GLfloat*) (*m)[0]);
}
 
inline void
glLoadMatrix (const ATOMSMATH_INTERNAL_NAMESPACE::M44f& m)
{
    throwBadMatrix (m);
    glLoadMatrixf ((GLfloat*) m[0]);
}
 
inline void
glLoadMatrix (const ATOMSMATH_INTERNAL_NAMESPACE::M44f* m)
{
    throwBadMatrix (*m);
    glLoadMatrixf ((GLfloat*) (*m)[0]);
}
 
ATOMSMATH_INTERNAL_NAMESPACE_HEADER_ENTER
 
 
class GLPushMatrix
{
  public:
    GLPushMatrix() { glPushMatrix(); }
    ~GLPushMatrix() { glPopMatrix(); }
};
 
 
class GLPushAttrib
{
  public:
    GLPushAttrib (GLbitfield mask) { glPushAttrib (mask); }
 
    ~GLPushAttrib() { glPopAttrib(); }
};
 
 
class GLBegin
{
  public:
 
    GLBegin (GLenum mode) { glBegin (mode); }
 
    ~GLBegin() { glEnd(); }
};
 
ATOMSMATH_INTERNAL_NAMESPACE_HEADER_EXIT
 
#endif