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Interactive 3D Spectrum Analyzer Visualization for Windows Media Player

, 17 May 2009
Interactive 3D Spectrum Analyzer for Windows Media Player using DirectX 9 and some light GPGPU.
 * Copyright (c) 2005-2009, Carlo McWhirter. All Rights Reserved.
 * Copyright (c) 2009, Hyteq Systems. All Rights Reserved.

#include "stdafx.h"
#include <GL/gl.h>
#include <GL/glu.h>
//#include <GL/glaux.h>
#include "GLRenderContext.h"

BOOL GLRenderContext::m_bIsInitialized = FALSE;

 * GLRenderContext constructor.
 * Creates an opengl rendering context. If multiple OpenGL rendering
 * contexts exist in an application, this class will make sure only
 * one rendering context is active at a time.
GLRenderContext::GLRenderContext() :
	m_hRC( NULL )

/// Disassociates and frees the current device context
    if ( m_hRC )
        wglMakeCurrent( NULL, NULL );
        wglDeleteContext( m_hRC );

/// Called to prepare this class for rendering.
void GLRenderContext::Initialize(HDC hReferenceDC, BOOL bIsMemoryDC)
	if( m_bIsInitialized == FALSE )
		m_bIsInitialized = TRUE;

		ZeroMemory( &pfd, sizeof( pfd ) );
		pfd.nSize = sizeof( pfd );
		pfd.nVersion = 1;
		pfd.iPixelType = PFD_TYPE_RGBA;
		pfd.cColorBits = 32;
		pfd.cDepthBits = 16;
		pfd.iLayerType = PFD_MAIN_PLANE;

		if( bIsMemoryDC )
		int format = ChoosePixelFormat( hReferenceDC, &pfd );
		SetPixelFormat( hReferenceDC, format, &pfd );

		m_hRC = wglCreateContext( hReferenceDC );

/// Called to begin rendering.
void GLRenderContext::Begin(HDC hDC, BOOL bIsMemoryDC)
	if( m_bIsInitialized == FALSE )
		Initialize( hDC, bIsMemoryDC );

	wglMakeCurrent( hDC, m_hRC );

	glMatrixMode( GL_MODELVIEW );

/// Called to end rendering.
void GLRenderContext::End(HDC hDC)
	SwapBuffers( hDC );

/// Checks whether the context has been initialized at least once.
BOOL GLRenderContext::IsInitialized()
	return m_bIsInitialized;

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About the Author

Carlo McWhirter
Software Developer (Senior) Hyteq Systems
United States United States
I have been programming in C/C++ for over 10 years now, and I've programmed in C# since the .NET 1.0 beta was released. I know a lot of other languages, but I find very few languages to be as capable as the C family of languages.
I've worked for a few large corporations, but my favorite job was when I worked for ATS (Automation Tooling Systems) as a Control Systems Engineer. Programming PLCs taught me about the core of computing and the currently under-utilized power of concurrent state machines. Programming real-time computer systems for vision guided robotics and multi-axis motion control is just fun.
My personal interest are computation for finance, aritificial intelligence, physics, electronics engineering, embedded systems, motion control, and of course Music/Audio.

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