87 lines
2.1 KiB
Java
87 lines
2.1 KiB
Java
package xyz.valnet.engine.math;
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import java.nio.FloatBuffer;
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import xyz.valnet.engine.util.BufferUtils;
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public class Matrix4f {
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public static final int SIZE = 4 * 4;
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public float[] elements = new float[SIZE];
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public Matrix4f() {
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}
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public static Matrix4f identity() {
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Matrix4f result = new Matrix4f();
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for (int i = 0; i < SIZE; i++) {
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result.elements[i] = 0.0f;
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}
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result.elements[0 + 0 * 4] = 1.0f;
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result.elements[1 + 1 * 4] = 1.0f;
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result.elements[2 + 2 * 4] = 1.0f;
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result.elements[3 + 3 * 4] = 1.0f;
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return result;
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}
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public static Matrix4f orthographic(float left, float right, float bottom, float top, float near, float far) {
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Matrix4f result = identity();
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result.elements[0 + 0 * 4] = 2.0f / (right - left);
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result.elements[1 + 1 * 4] = 2.0f / (top - bottom);
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result.elements[2 + 2 * 4] = 2.0f / (near - far);
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result.elements[0 + 3 * 4] = (left + right) / (left - right);
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result.elements[1 + 3 * 4] = (bottom + top) / (bottom - top);
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result.elements[2 + 3 * 4] = (far + near) / (far - near);
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return result;
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}
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public static Matrix4f translate(Vector3f vector) {
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Matrix4f result = identity();
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result.elements[0 + 3 * 4] = vector.x;
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result.elements[1 + 3 * 4] = vector.y;
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result.elements[2 + 3 * 4] = vector.z;
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return result;
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}
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public static Matrix4f rotate(float angle) {
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Matrix4f result = identity();
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float r = (float) Math.toRadians(angle);
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float cos = (float) Math.cos(r);
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float sin = (float) Math.sin(r);
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result.elements[0 + 0 * 4] = cos;
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result.elements[1 + 0 * 4] = sin;
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result.elements[0 + 1 * 4] = -sin;
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result.elements[1 + 1 * 4] = cos;
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return result;
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}
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public Matrix4f multiply(Matrix4f matrix) {
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Matrix4f result = new Matrix4f();
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for (int y = 0; y < 4; y++) {
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for (int x = 0; x < 4; x++) {
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float sum = 0.0f;
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for (int e = 0; e < 4; e++) {
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sum += this.elements[x + e * 4] * matrix.elements[e + y * 4];
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}
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result.elements[x + y * 4] = sum;
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}
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}
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return result;
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}
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public FloatBuffer toFloatBuffer() {
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return BufferUtils.createFloatBuffer(elements);
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}
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}
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