microsoft foundation classes 3

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6.5 OpenGL ProgrammingTool to Build and Display Complex 3DScenesGL ± High-End Graphics Processing 1980s ± Silicon Graphics ± User Interface Management ± UNIX and X WindowOpen GL ± International Standard



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Core TermsModelPolygons ± Wireframe

± Shaded ± Texture-mappingNormal

TranslationRotationScaling



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GL_LINESvoid DrawGLSquare( ) {

glBegin( GL_LINES );glVertex3f( -5.0f, 5.0f, 0.0f );glVertex3f( -5.0f, -5.0f, 0.0f );glVertex3f( -5.0f, -5.0f, 0.0f );glVertex3f( 5.0f, -5.0f, 0.0f );glVertex3f( 5.0f, -5.0f, 0.0f );glVertex3f( 5.0f, 5.0f, 0.0f );glVertex3f( -5.0f, 5.0f, 0.0f );

glEnd( );}



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GL_POLYGONvoid DrawSquarePatch( ) {

glBegin( GL_POLYGON )glVertex3f( 5.0f, 5.0f, 0.0f );

glVertex3f( -5.0f, 5.0f, 0.0f );glVertex3f( -5.0f, -5.0f, 0.0f );glVertex3f( 5.0f, -5.0f, 0.0f );glNormal3f( 0.0f, 0.0f, 1.0f );

glEnd( );}



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Viewing Frustrum

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LightAmbient LightDiffuse Light

Specular LightLight Intensity Equation

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Examples of OpenGL Light

CommandsGLfloat fLight[4] = { 1.0f, 1.0f, 1.0f,

1.0f };glLightfv( GL_LIGHT0, GL_AMBIENT, fLight );glLightfv( GL_LIGHT0, GL_DIFFUSE, fLight );glLightfv( GL_LIGHT0, GL_SPECULAR,

fLight );glEnable( GL_DEPTH_TEST );glEnable( GL_LIGHT0 );glDisable( GL_LIGHT0 );glDisable( GL_LIGHTING );



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Object Material PropertiesColor Properties ± How much light it reflects ± How it handles specular light

± How shiny it isExample

Glfloat fMaterial[4] = { 0.0f, 0.0f, 1.0f,1.0f };

glMaterialfv( GL_FRONT,GL_AMBIENT_AND_DIFFUSE, fMaterial );



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Translation

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Scaling

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90

Matrix Stack void RenderView( ) {

glPushMatrix( );DrawGLSquare( );

glPopMatrix( );glPushMatrix( );

glScalef( 0.5f, 0.5f, 0.0f );glRotatef( 45.0f, 0.0f, 0.0f, 1.0f );DrawGLSquare( );

glPopMatrix( );}



91

OpenGL Data TypesGLbyteGLubyteGLboolean

GLshortGLintGLuintGLfloat

GLdoubleGLvoidHGLRC



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OpenGL Rendering ContextOpenGL Command

Current OpenGLRendering Context

WindowsDevice Context



93

Three Wiggle FunctionsHGLRC wglCreateContext( HDC hDC );BOOL wglDeleteContext( HGLRC hRC );BOOL wglMakeCurrent( HDC hDC,

HGLRC hRC );



94

PIXELFORMATDESCRIPTOR PIXELFORMATDESCRIPTOR pfd = {

sizeof(PIXELFORMATDESCRIPTOR), 1,PFD_DRAW_TO_WINDOW |PFD_SUPPORT_OPENGL |PFD_DOUBLEBUFFER, PFD_TYPE_RGBA,24,

0, 0, 0, 0, 0, 0,// Color bits and shift0, 0, 0, 0, 0, 0, 0, // Alpha and accum

32, // 32-bit depth buffer0, 0, // No stencil or aux bufferPFD_MAIN_PLANE, // Layer type

0, 0, 0, 0 };



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Integration of OpenGL and MFCCreate your basic MFC application usingthe MFC AppWizardAdd the OpenGL libraries to your project¶s

link list:OpenGL32.lib GLAux.lib GLU32.lib

Add custom view class to your projectIntegrate the custom view class to your applicationBuild your 3D scene



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TestOpenGLSDIAdd CGLView Class to the project

# include ³ GLView.h ´

Modify the view class to inherit fromCGLView ± Search for, and replace, every mention of the

view class¶s original base class with CGLViewOnDraw( ) Handler



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TestOpenGLMDI

MDIAdd CGLView Class to the project

# include ³ GLView.h ´

Modify the view class to inherit fromCGLView ± Search for, and replace, every mention of

the view class¶s original base class with

CGLViewOnDraw( ) Handler Proportional Display



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Demos of OpenGL CapabilitiesGLObjectGLSceneGLTexcube



99

6.6 Playing SoundSound Effects:

.wavMIDI Music:

.mid

: - -->



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::PlaySound( « )Project/Setting/Link ± Object/Library Modules: winmm.lib

Example:#

include <iostream.h># include <windows.h># include "mmsystem.h"int main( )

{::PlaySound("C:\\Windows\\Media\\

ding.wav", NULL, SND_SYNC );}



101

Playing MIDI by MCI# include <iostream.h># include <windows.h># include "mmsystem.h"

void main( ){MCI_OPEN_PARMS mciOpenParms;MCI_PLAY_PARMS mciPlayParms;

mciOpenParms.lpstrDeviceType ="sequencer";

mciOpenParms.lpstrElementName ="C:\\MIDI Files\\ .mid";



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Playing MIDI by MCI (continue)DWORD mciError = mciSendCommand(NULL,

MCI_OPEN,MCI_OPEN_TYPE |MCI_OPEN_ELEMENT | MCI_WAIT,(DWORD)&mciOpenParms);

UINT deviceID = mciOpenParms.wDeviceID;mciError = mciSendCommand(deviceID,

MCI_PLAY,MCI_WAIT,(DWORD)&mciPlayParms);

if (!mciError)mciError = mciSendCommand(deviceID,

MCI_CLOSE, 0, NULL);}



103

A Sample WAVE File FormatSize inBytes Contents Comments4 ³RIFF´ One byte contains one charcter 4 400036 file size minus 8 bytes4 ³WAVE´ fccType

4 ³fmt ³ Notice the blank 4 16 WAVE format chunk is 16

bytes2 1 1 represents PCM format2 2 number of channels4 44100 Sampling rate4 176400 nAvgBytesPerSec



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A Sample WAVE File Format(continue)

Size inBytes Contents Comments2 2 Bytes per sample

2 16 wBitsPerSample4 ³data´4 400000 size of wave dataDepends on data digitized audio data



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Homework#3Revise your Homework#1 program into aWindow program. Of course, you may addor reduce capabilities.

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