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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
GLRenderContext::~GLRenderContext()
{
    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;

		PIXELFORMATDESCRIPTOR pfd;
		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 )
			pfd.dwFlags = PFD_DRAW_TO_BITMAP | PFD_SUPPORT_OPENGL | PFD_TYPE_RGBA;
		else
			pfd.dwFlags = PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER | PFD_TYPE_RGBA;
		
		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 );

	glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
	glMatrixMode( GL_MODELVIEW );
    glLoadIdentity();
}

/// 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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License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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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