package org.lwjgl.test.opengles.util;
import org.lwjgl.BufferUtils;
import java.nio.FloatBuffer;
/**
* Utility class that emulates immediate mode vertex data submission.
* Can be used to create VBO data.
*/
public final class ImmediateModeBuffer {
private FloatBuffer buffer;
public ImmediateModeBuffer(final int startSize) {
this.buffer = BufferUtils.createFloatBuffer(startSize);
}
private void checkSize(final int count) {
while ( buffer.remaining() < count ) {
final FloatBuffer newBuffer = BufferUtils.createFloatBuffer(buffer.capacity() << 1);
buffer.flip();
newBuffer.put(buffer);
buffer = newBuffer;
}
}
public FloatBuffer getBuffer() {
buffer.flip();
return buffer;
}
public void glVertex2f(final float x, final float y) {
checkSize(2);
buffer.put(x).put(y);
}
public void glVertex3f(final float x, final float y, final float z) {
checkSize(3);
buffer.put(x).put(y).put(z);
}
public void glVertex4f(final float x, final float y, final float z, final float w) {
checkSize(4);
buffer.put(x).put(y).put(z).put(w);
}
public void glNormal3f(final float x, final float y, final float z) {
checkSize(3);
buffer.put(x).put(y).put(z);
}
public void glTexCoord2f(final float s, final float t) {
checkSize(2);
buffer.put(s).put(t);
}
}