OpenGL学习日记-2014.1.21--混合

#include "alpha.h"
#include "CLApp.h"
static int leftFirst = GL_TRUE;


void alphaInit()
{
	glEnable( GL_BLEND );
	glDisable( GL_DEPTH );
	glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA );
	glShadeModel( GL_FLAT );
	glClearColor( 0.0, 0.0, 0.0, 0.0 );
}

void alphaDrawLeftTriangle()
{
	//黄色三角形
	glBegin( GL_TRIANGLES );
	glColor4f(1.0, 1.0, 0.0, 0.75);
	glVertex3f( 1, 9, 0.0 );
	glVertex3f( 1, 1, 0.0 );
	glVertex3f( 7, 5, 0.0 );
	glEnd();
}

void alphaDrawRightTriangle()
{
	//
	glBegin( GL_TRIANGLES );
	glColor4f( 0.0, 1.0, 1.0, 0.25 );
	glVertex3f(9, 9,0.0);
	glVertex3f(3, 5, 0.0);
	glVertex3f(9, 1,0.0);
	glEnd();
}

void alphaDisplay()
{
	glClear( GL_COLOR_BUFFER_BIT );
	if (leftFirst)
	{
		alphaDrawLeftTriangle();
		alphaDrawRightTriangle();
	}
	else
	{
		alphaDrawRightTriangle();
		alphaDrawLeftTriangle();
	}

}

void alphaUpdate(float dt)
{
	CLInput* pInput = theAppInstance->getInputInstance();
	if (pInput->IsKeyUp(DIK_T))
	{
		leftFirst = !leftFirst;
	}
}

#include "alpha3D.h"

#define MAXZ 8.0
#define MINZ -8.0
#define ZINC 0.4

static float solidz = MAXZ;
static float transparentz = MINZ;
static GLuint sphereList, cubeList;

void alpha3DInit()
{
	GLfloat mat_specular[] = {1.0, 1.0, 1.0, 0.15 };
	GLfloat mat_shininess[] = {100.0};
	GLfloat position[] = {5, 5, 10.0, 0.0 };
	glLoadIdentity();
	gluLookAt(0.0, 0.0, -30.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0);
	glMaterialfv( GL_FRONT, GL_SPECULAR, mat_specular );
	glMaterialfv( GL_FRONT, GL_SHININESS, mat_shininess );
	glMaterialfv( GL_LIGHT0, GL_POSITION, position );

	glEnable( GL_LIGHTING );
	glEnable( GL_LIGHT0 );
	glEnable( GL_DEPTH_TEST );

	sphereList = glGenLists(1); 
	
	glNewList( sphereList, GL_COMPILE );
		GLUquadricObj* qobj = gluNewQuadric(); //二次曲面对象
		gluSphere(qobj, 3.0, 16, 16);
		gluDeleteQuadric(qobj);
	glEndList();
	cubeList = glGenLists(1);
	glNewList( cubeList, GL_COMPILE );
		GLUquadricObj* qobj1 = gluNewQuadric(); //二次曲面对象
		//gluDisk(qobj1, 2.0, 5.0, 15.0, 10.0);
		gluQuadricDrawStyle(qobj1, GLU_FILL);
		gluCylinder(qobj1, 1, 4, 3, 15, 10);
		gluDeleteQuadric(qobj1);
	glEndList();

	
}

void alpha3DDisplay()
{
	GLfloat mat_solid[] = {0.75, 0.75, 0.0, 1.0 };
	GLfloat mat_zero[] = {0.0, 0.0, 0.0, 1.0};
	GLfloat mat_transparent[] = {0.0, 0.8, 0.8, 0.6 };
	GLfloat mat_emission[] = {0.0, 0.3, 0.3, 0.6 };

	glClear( GL_COLOR_BUFFER_BIT| GL_DEPTH_BUFFER_BIT );

	glPushMatrix();
		glTranslatef( 5, 0, solidz );
		glMaterialfv( GL_FRONT, GL_EMISSION, mat_zero );
		glCallList( sphereList );
	glPopMatrix();

	glPushMatrix();
		glTranslatef( 5, 0, transparentz );
		glRotatef( 15.0, 1.0, 1.0, 0.0 );
		glRotatef( 30.0, 0.0, 1.0, 0.0 );
		glMaterialfv( GL_FRONT, GL_EMISSION, mat_emission );
		glMaterialfv( GL_FRONT, GL_DIFFUSE, mat_transparent );
		glEnable( GL_BLEND );
		glDepthMask( GL_FALSE );
		glBlendFunc( GL_SRC_ALPHA, GL_ONE );
		glCallList( cubeList );
		glDepthMask(GL_TRUE );
		glDisable( GL_BLEND );
	glPopMatrix();
}

void alpha3DUpdate(float delta)
{
	static bool ani = false;
	static int tTime = 0;
	if (solidz <= MINZ || transparentz >= MAXZ)
	{
		ani = false;
	}

	if ( ani  )
	{
		tTime += delta;
		if (tTime > 100)
		{
			solidz -= ZINC;
			transparentz += ZINC;
			tTime = 0;
		}
	}

	CLInput* pInput = theAppInstance->getInputInstance();
	if (pInput->IsKeyUp(DIK_A))
	{
		ani = true;
	}
	else if (pInput->IsKeyUp(DIK_R))
	{
		solidz = MAXZ;
		transparentz = MINZ;
	}
}