68 lines
1.7 KiB
Java
68 lines
1.7 KiB
Java
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import java.lang.Double;
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/**
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* The DepthBuffer class implements a DepthBuffer and its pass test.
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*/
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public class DepthBuffer {
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private double[] buffer;
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int width;
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int height;
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/**
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* Constructs a DepthBuffer of size width x height.
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* The buffer is initially cleared.
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*/
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public DepthBuffer(int width, int height) {
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buffer = new double[width * height];
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this.width = width;
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this.height = height;
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clear();
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}
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/**
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* Clears the buffer to infinite depth for all fragments.
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*/
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public void clear() {
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for (int i = 0; i < height; i++) {
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for (int j = 0; j < width; j++) {
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buffer[i * width + j] = Double.POSITIVE_INFINITY;
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// buffer[i * width + j] = 0;
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}
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}
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}
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/**
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* Test if a fragment passes the DepthBuffer test, i.e. is the fragment the
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* closest at its position.
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*/
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public boolean testFragment(Fragment fragment) {
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if ((fragment.getX() >= 0) && (fragment.getX() < width) && (fragment.getY() >= 0)
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&& (fragment.getY() < height)) {
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if (fragment.getDepth() < this.buffer[fragment.getY() * width + fragment.getX()]) {
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return true;
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}
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// if (fragment.getDepth() > this.buffer[fragment.getY() * width +
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// fragment.getX()]) {
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// return true;
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// }
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return false;
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} else {
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return false;
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}
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}
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/**
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* Writes the fragment depth to the buffer
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*/
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public void writeFragment(Fragment fragment) {
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if (testFragment(fragment)) {
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this.buffer[fragment.getY() * width + fragment.getX()] = fragment.getDepth();
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}
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}
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}
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