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/**
* @(#) texobj.java
* @(#) author: Brian Paul (converted to Java by Ron Cemer)
*/
import java.applet.*;
import java.awt.*;
import java.awt.event.*;
import java.lang.*;
import java.util.*;
import java.io.*;
import java.util.*;
import gl4java.GLContext;
import gl4java.awt.GLAnimCanvas;
import gl4java.applet.SimpleGLAnimApplet1;
public class texobj extends SimpleGLAnimApplet1
{
/* Initialize the applet */
public void init()
{
super.init();
Dimension d = getSize();
canvas = new texobjCanvas(d.width, d.height);
add("Center", canvas);
}
/* Local GLAnimCanvas extension class */
private class texobjCanvas extends GLAnimCanvas
{
private int TexObj[];
float Angle = 0.0f;
public texobjCanvas(int w, int h)
{
super(w, h);
GLContext.gljNativeDebug = false;
GLContext.gljClassDebug = false;
setAnimateFps(30.0);
TexObj = new int[2];
}
public void preInit()
{
doubleBuffer = true;
stereoView = false;
}
public void init()
{
System.out.println("init(): " + this);
reshape(getSize().width, getSize().height);
int width = 8, height = 8;
byte tex1[] =
{
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 1, 0, 0, 0,
0, 0, 0, 1, 1, 0, 0, 0,
0, 0, 0, 0, 1, 0, 0, 0,
0, 0, 0, 0, 1, 0, 0, 0,
0, 0, 0, 0, 1, 0, 0, 0,
0, 0, 0, 1, 1, 1, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0
};
byte tex2[] =
{
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 2, 2, 0, 0, 0,
0, 0, 2, 0, 0, 2, 0, 0,
0, 0, 0, 0, 0, 2, 0, 0,
0, 0, 0, 0, 2, 0, 0, 0,
0, 0, 0, 2, 0, 0, 0, 0,
0, 0, 2, 2, 2, 2, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0
};
byte tex[] = new byte[64*3];
int i, j;
gl.glDisable(GL_DITHER);
/* Setup texturing */
gl.glEnable(GL_TEXTURE_2D);
gl.glTexEnvi(GL_TEXTURE_ENV,GL_TEXTURE_ENV_MODE,GL_DECAL);
gl.glHint(GL_PERSPECTIVE_CORRECTION_HINT,GL_FASTEST);
/* generate texture object IDs */
gl.glGenTextures(2, TexObj);
/* setup first texture object */
gl.glBindTexture(GL_TEXTURE_2D, TexObj[0]);
/* red on white */
for (i = 0; i < height; i++)
{
for (j = 0; j < width; j++)
{
int p = i*width+j;
if ((tex1[(height-i-1)*width+j]) != (byte)0)
{
tex[p*3] = (byte)255;
tex[(p*3)+1] = (byte)0;
tex[(p*3)+2] = (byte)0;
}
else
{
tex[p*3] = (byte)255;
tex[(p*3)+1] = (byte)255;
tex[(p*3)+2] = (byte)255;
}
}
}
gl.glTexImage2D
(GL_TEXTURE_2D,
0,
3,
width,
height,
0,
GL_RGB,
GL_UNSIGNED_BYTE,
tex);
gl.glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_NEAREST);
gl.glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_NEAREST);
gl.glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_S,GL_REPEAT);
gl.glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_T,GL_REPEAT);
/* end of texture object */
/* setup second texture object */
gl.glBindTexture(GL_TEXTURE_2D,TexObj[1]);
/* green on blue */
for (i = 0; i < height; i++)
{
for (j = 0; j < width; j++)
{
int p = i*width+j;
if ((tex2[(height-i-1)*width+j]) != (byte)0)
{
tex[p*3] = (byte)0;
tex[(p*3)+1] = (byte)255;
tex[(p*3)+2] = (byte)0;
}
else
{
tex[p*3] = (byte)0;
tex[(p*3)+1] = (byte)0;
tex[(p*3)+2] = (byte)255;
}
}
}
gl.glTexImage2D
(GL_TEXTURE_2D,
0,
3,
width,
height,
0,
GL_RGB,
GL_UNSIGNED_BYTE,
tex);
gl.glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_NEAREST);
gl.glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_NEAREST);
gl.glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_S,GL_REPEAT);
gl.glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_T,GL_REPEAT);
/* end texture object */
glj.gljCheckGL();
}
public void reshape(int width, int height)
{
gl.glViewport(0,0,width,height);
gl.glMatrixMode(GL_PROJECTION);
gl.glLoadIdentity();
gl.glFrustum(-2.0, 2.0, -2.0, 2.0, 6.0, 20.0);
gl.glMatrixMode(GL_MODELVIEW);
gl.glLoadIdentity();
gl.glTranslatef(0.0f, 0.0f, -8.0f);
}
public void display()
{
if (glj.gljMakeCurrent() == false) return;
Angle += 0.2f;
gl.glDepthFunc(GL_EQUAL);
gl.glClear(GL_COLOR_BUFFER_BIT);
gl.glColor3f(1.0f, 1.0f, 1.0f);
/* draw first polygon */
gl.glPushMatrix();
gl.glTranslatef(-1.0f, 0.0f, 0.0f);
gl.glRotatef(Angle, 0.0f, 0.0f, 1.0f);
gl.glBindTexture(GL_TEXTURE_2D, TexObj[0]);
gl.glBegin(GL_POLYGON);
gl.glTexCoord2f(0.0f, 0.0f); gl.glVertex2f(-1.0f, -1.0f);
gl.glTexCoord2f(1.0f, 0.0f); gl.glVertex2f( 1.0f, -1.0f);
gl.glTexCoord2f(1.0f, 1.0f); gl.glVertex2f( 1.0f, 1.0f);
gl.glTexCoord2f(0.0f, 1.0f); gl.glVertex2f(-1.0f, 1.0f);
gl.glEnd();
gl.glPopMatrix();
/* draw second polygon */
gl.glPushMatrix();
gl.glTranslatef(1.0f, 0.0f, 0.0f);
gl.glRotatef(Angle-90.0f, 0.0f, 1.0f, 0.0f);
gl.glBindTexture(GL_TEXTURE_2D, TexObj[1]);
gl.glBegin(GL_POLYGON);
gl.glTexCoord2f(0.0f, 0.0f); gl.glVertex2f(-1.0f, -1.0f);
gl.glTexCoord2f(1.0f, 0.0f); gl.glVertex2f( 1.0f, -1.0f);
gl.glTexCoord2f(1.0f, 1.0f); gl.glVertex2f( 1.0f, 1.0f);
gl.glTexCoord2f(0.0f, 1.0f); gl.glVertex2f(-1.0f, 1.0f);
gl.glEnd();
gl.glPopMatrix();
glj.gljSwap();
glj.gljCheckGL();
glj.gljFree();
//if (!isSuspended()) repaint(); // Animate at full speed.
}
}
}
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