177 lines
3.8 KiB
C++
177 lines
3.8 KiB
C++
//
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// SPDX-License-Identifier: BSD-3-Clause
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// Copyright Contributors to the OpenEXR Project.
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//
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//
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// Convenience functions that call GL with Imath types
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//
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#ifndef INCLUDED_IMATHGL_H
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#define INCLUDED_IMATHGL_H
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#include <GL/gl.h>
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#include "ImathFun.h"
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#include "ImathMatrix.h"
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#include "ImathNamespace.h"
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#include "ImathVec.h"
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/// Call glVertex3f
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inline void
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glVertex (const IMATH_INTERNAL_NAMESPACE::V3f& v)
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{
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glVertex3f (v.x, v.y, v.z);
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}
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/// Call glVertex2f
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inline void
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glVertex (const IMATH_INTERNAL_NAMESPACE::V2f& v)
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{
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glVertex2f (v.x, v.y);
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}
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/// Call glNormal3f
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inline void
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glNormal (const IMATH_INTERNAL_NAMESPACE::V3f& n)
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{
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glNormal3f (n.x, n.y, n.z);
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}
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/// Call glColor3f
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inline void
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glColor (const IMATH_INTERNAL_NAMESPACE::V3f& c)
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{
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glColor3f (c.x, c.y, c.z);
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}
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/// Call glTranslatef
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inline void
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glTranslate (const IMATH_INTERNAL_NAMESPACE::V3f& t)
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{
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glTranslatef (t.x, t.y, t.z);
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}
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/// Call glTexCoord2f
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inline void
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glTexCoord (const IMATH_INTERNAL_NAMESPACE::V2f& t)
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{
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glTexCoord2f (t.x, t.y);
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}
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/// Disable GL textures
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inline void
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glDisableTexture()
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{
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glActiveTexture (GL_TEXTURE1);
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glBindTexture (GL_TEXTURE_2D, 0);
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glDisable (GL_TEXTURE_2D);
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glActiveTexture (GL_TEXTURE0);
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}
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namespace
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{
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const float GL_FLOAT_MAX = 1.8e+19; // sqrt (FLT_MAX)
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inline bool
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badFloat (float f)
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{
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return !IMATH_INTERNAL_NAMESPACE::finitef (f) || f < -GL_FLOAT_MAX || f > GL_FLOAT_MAX;
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}
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} // namespace
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/// Throw an exception if m is not a valid matrix for GL
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inline void
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throwBadMatrix (const IMATH_INTERNAL_NAMESPACE::M44f& m)
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{
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if (badFloat (m[0][0]) || badFloat (m[0][1]) || badFloat (m[0][2]) || badFloat (m[0][3]) ||
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badFloat (m[1][0]) || badFloat (m[1][1]) || badFloat (m[1][2]) || badFloat (m[1][3]) ||
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badFloat (m[2][0]) || badFloat (m[2][1]) || badFloat (m[2][2]) || badFloat (m[2][3]) ||
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badFloat (m[3][0]) || badFloat (m[3][1]) || badFloat (m[3][2]) || badFloat (m[3][3]))
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throw std::invalid_argument ("GL matrix overflow");
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}
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/// Call glMultmatrixf. Throw an exception if m is not a valid matrix for GL.
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inline void
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glMultMatrix (const IMATH_INTERNAL_NAMESPACE::M44f& m)
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{
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throwBadMatrix (m);
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glMultMatrixf ((GLfloat*) m[0]);
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}
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/// Call glMultmatrixf. Throw an exception if m is not a valid matrix for GL.
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inline void
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glMultMatrix (const IMATH_INTERNAL_NAMESPACE::M44f* m)
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{
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throwBadMatrix (*m);
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glMultMatrixf ((GLfloat*) (*m)[0]);
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}
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/// Call glLoadmatrixf. Throw an exception if m is not a valid matrix for GL.
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inline void
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glLoadMatrix (const IMATH_INTERNAL_NAMESPACE::M44f& m)
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{
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throwBadMatrix (m);
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glLoadMatrixf ((GLfloat*) m[0]);
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}
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/// Call glLoadmatrixf. Throw an exception if m is not a valid matrix for GL.
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inline void
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glLoadMatrix (const IMATH_INTERNAL_NAMESPACE::M44f* m)
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{
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throwBadMatrix (*m);
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glLoadMatrixf ((GLfloat*) (*m)[0]);
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}
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IMATH_INTERNAL_NAMESPACE_HEADER_ENTER
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///
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/// A class object that pushes/pops the GL matrix. This object assists with
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/// proper cleanup of the state when exceptions are thrown.
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///
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class GLPushMatrix
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{
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public:
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GLPushMatrix() { glPushMatrix(); }
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~GLPushMatrix() { glPopMatrix(); }
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};
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///
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/// A class object that pushes/pops the current GL attribute state. This object assists with
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/// proper cleanup of the state when exceptions are thrown.
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///
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class GLPushAttrib
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{
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public:
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/// call glPushAttrib()
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GLPushAttrib (GLbitfield mask) { glPushAttrib (mask); }
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/// call glPopAttrib()
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~GLPushAttrib() { glPopAttrib(); }
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};
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///
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/// A class object that wraps glBegin/glEnd. The constructor calls
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/// glBegin(). The destructor calls glEnd().
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///
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class GLBegin
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{
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public:
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/// Call glBegin()
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GLBegin (GLenum mode) { glBegin (mode); }
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/// Call glEnd()
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~GLBegin() { glEnd(); }
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};
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IMATH_INTERNAL_NAMESPACE_HEADER_EXIT
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#endif
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