Added gluProject & gluUnproject (not tested)
This commit is contained in:
Erik Duijs
parent
4732089913
commit
ea2f9a3910
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@ -1,6 +1,7 @@
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package org.lwjgl.opengl.glu;
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import java.nio.FloatBuffer;
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import java.nio.IntBuffer;
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import org.lwjgl.opengl.GL11;
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@ -14,29 +15,137 @@ import org.lwjgl.opengl.GL11;
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public class Project extends Util implements GLUConstants {
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private static FloatBuffer matrix = createFloatBuffer(16);
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private static FloatBuffer finalMatrix = createFloatBuffer(16);
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/**
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* Make m an identity matrix
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* Make matrix an identity matrix
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*/
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private static void __gluMakeIdentityf() {
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matrix.put(0 + 4 * 0, 1);
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matrix.put(0 + 4 * 1, 0);
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matrix.put(0 + 4 * 2, 0);
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matrix.put(0 + 4 * 3, 0);
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matrix.put(1 + 4 * 0, 0);
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matrix.put(1 + 4 * 1, 1);
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matrix.put(1 + 4 * 2, 0);
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matrix.put(1 + 4 * 3, 0);
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matrix.put(2 + 4 * 0, 0);
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matrix.put(2 + 4 * 1, 0);
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matrix.put(2 + 4 * 2, 1);
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matrix.put(2 + 4 * 3, 0);
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matrix.put(3 + 4 * 0, 0);
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matrix.put(3 + 4 * 1, 0);
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matrix.put(3 + 4 * 2, 0);
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matrix.put(3 + 4 * 3, 1);
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private static void __gluMakeIdentityf(FloatBuffer m) {
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m.put(0 + 4 * 0, 1);
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m.put(0 + 4 * 1, 0);
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m.put(0 + 4 * 2, 0);
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m.put(0 + 4 * 3, 0);
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m.put(1 + 4 * 0, 0);
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m.put(1 + 4 * 1, 1);
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m.put(1 + 4 * 2, 0);
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m.put(1 + 4 * 3, 0);
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m.put(2 + 4 * 0, 0);
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m.put(2 + 4 * 1, 0);
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m.put(2 + 4 * 2, 1);
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m.put(2 + 4 * 3, 0);
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m.put(3 + 4 * 0, 0);
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m.put(3 + 4 * 1, 0);
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m.put(3 + 4 * 2, 0);
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m.put(3 + 4 * 3, 1);
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}
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/**
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* Method __gluMultMatrixVecf
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* @param finalMatrix
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* @param in
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* @param out
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*/
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private static void __gluMultMatrixVecf(FloatBuffer finalMatrix, float[] in, float[] out) {
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for (int i=0; i<4; i++) {
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out[i] =
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in[0] * finalMatrix.get(0*4+i) +
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in[1] * finalMatrix.get(1*4+i) +
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in[2] * finalMatrix.get(2*4+i) +
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in[3] * finalMatrix.get(3*4+i);
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}
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}
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/**
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* @param finalMatrix
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* @param finalMatrix2
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* @return
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*/
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private static boolean __gluInvertMatrixf(FloatBuffer src, FloatBuffer inverse) {
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int i, j, k, swap;
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float t;
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float[][] temp = new float[4][4];
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for (i=0; i<4; i++) {
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for (j=0; j<4; j++) {
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temp[i][j] = src.get(i*4+j);
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}
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}
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__gluMakeIdentityf(inverse);
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for (i = 0; i < 4; i++) {
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/*
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** Look for largest element in column
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*/
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swap = i;
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for (j = i + 1; j < 4; j++) {
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/*if (fabs(temp[j][i]) > fabs(temp[i][i])) {
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swap = j;
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}*/
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if (Math.abs(temp[j][i]) > Math.abs(temp[i][i])) {
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swap = j;
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}
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}
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if (swap != i) {
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/*
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** Swap rows.
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*/
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for (k = 0; k < 4; k++) {
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t = temp[i][k];
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temp[i][k] = temp[swap][k];
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temp[swap][k] = t;
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t = inverse.get(i*4+k);
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inverse.put(i*4+k, inverse.get(swap*4+k));
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inverse.put(swap*4+k,t);
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}
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}
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if (temp[i][i] == 0) {
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/*
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** No non-zero pivot. The matrix is singular, which shouldn't
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** happen. This means the user gave us a bad matrix.
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*/
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return false;
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}
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t = temp[i][i];
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for (k = 0; k < 4; k++) {
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temp[i][k] /= t;
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inverse.put(i*4+k, inverse.get(i*4+k) / t);
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}
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for (j = 0; j < 4; j++) {
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if (j != i) {
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t = temp[j][i];
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for (k = 0; k < 4; k++) {
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temp[j][k] -= temp[i][k]*t;
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inverse.put(j*4+k, inverse.get(j*4+k) - inverse.get(i*4+k)*t);
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}
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}
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}
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}
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return true;
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}
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/**
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* @param modelMatrix
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* @param projMatrix
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* @param finalMatrix
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*/
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private static void __gluMultMatricesf(FloatBuffer a, FloatBuffer b, FloatBuffer r) {
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for (int i = 0; i < 4; i++) {
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for (int j = 0; j < 4; j++) {
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r.put(i*4+j,
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a.get(i*4+0)*b.get(0*4+j) +
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a.get(i*4+1)*b.get(1*4+j) +
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a.get(i*4+2)*b.get(2*4+j) +
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a.get(i*4+3)*b.get(3*4+j));
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}
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}
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}
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/**
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* Method gluPerspective.
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* @param fovy
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@ -55,7 +164,7 @@ public class Project extends Util implements GLUConstants {
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}
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cotangent = (float) Math.cos(radians) / sine;
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__gluMakeIdentityf();
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__gluMakeIdentityf(matrix);
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matrix.put(0 * 4 + 0, cotangent / aspect);
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matrix.put(1 * 4 + 1, cotangent);
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@ -80,15 +189,15 @@ public class Project extends Util implements GLUConstants {
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* @param upz
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*/
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public static void gluLookAt(
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float eyex,
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float eyey,
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float eyez,
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float centerx,
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float centery,
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float centerz,
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float upx,
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float upy,
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float upz) {
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float eyex,
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float eyey,
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float eyez,
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float centerx,
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float centery,
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float centerz,
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float upx,
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float upy,
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float upz) {
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int i;
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float[] forward = new float[3];
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@ -112,7 +221,7 @@ public class Project extends Util implements GLUConstants {
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/* Recompute up as: up = side x forward */
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cross(side, forward, up);
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__gluMakeIdentityf();
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__gluMakeIdentityf(matrix);
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matrix.put(0 * 4 + 0, side[0]);
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matrix.put(1 * 4 + 0, side[1]);
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matrix.put(2 * 4 + 0, side[2]);
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@ -129,6 +238,103 @@ public class Project extends Util implements GLUConstants {
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GL11.glTranslatef(-eyex, -eyey, -eyez);
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}
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/**
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* Method gluProject
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* @param objx
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* @param objy
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* @param objz
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* @param modelMatrix
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* @param projMatrix
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* @param viewport
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* @param winx
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* @param winy
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* @param winz
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* @return
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*/
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public static boolean gluProject(float objx, float objy, float objz,
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FloatBuffer modelMatrix,
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FloatBuffer projMatrix,
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IntBuffer viewport,
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FloatBuffer winx, FloatBuffer winy, FloatBuffer winz)
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{
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float[] in = new float[4];
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float[] out = new float[4];
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in[0]=objx;
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in[1]=objy;
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in[2]=objz;
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in[3]=1.0f;
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__gluMultMatrixVecf(modelMatrix, in, out);
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__gluMultMatrixVecf(projMatrix, out, in);
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if (in[3] == 0.0) return false;
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in[0] /= in[3];
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in[1] /= in[3];
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in[2] /= in[3];
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// Map x, y and z to range 0-1
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in[0] = in[0] * 0.5f + 0.5f;
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in[1] = in[1] * 0.5f + 0.5f;
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in[2] = in[2] * 0.5f + 0.5f;
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// Map x,y to viewport
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in[0] = in[0] * viewport.get(2) + viewport.get(0);
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in[1] = in[1] * viewport.get(3) + viewport.get(1);
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winx.put(0, in[0]);
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winy.put(0, in[1]);
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winz.put(0, in[2]);
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return true;
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}
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/**
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* Method gluUnproject
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* @param winx
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* @param winy
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* @param winz
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* @param modelMatrix
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* @param projMatrix
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* @param viewport
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* @param objx
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* @param objy
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* @param objz
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* @return
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*/
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public static boolean gluUnProject(float winx, float winy, float winz,
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FloatBuffer modelMatrix,
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FloatBuffer projMatrix,
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IntBuffer viewport,
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FloatBuffer objx, FloatBuffer objy, FloatBuffer objz)
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{
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float[] in = new float[4];
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float[] out = new float[4];
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__gluMultMatricesf(modelMatrix, projMatrix, finalMatrix);
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if (!__gluInvertMatrixf(finalMatrix, finalMatrix)) return false;
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in[0]=winx;
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in[1]=winy;
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in[2]=winz;
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in[3]=1.0f;
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// Map x and y from window coordinates
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in[0] = (in[0] - viewport.get(0)) / viewport.get(2);
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in[1] = (in[1] - viewport.get(1)) / viewport.get(3);
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// Map to range -1 to 1
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in[0] = in[0] * 2 - 1;
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in[1] = in[1] * 2 - 1;
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in[2] = in[2] * 2 - 1;
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__gluMultMatrixVecf(finalMatrix, in, out);
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if (out[3] == 0.0) return false;
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out[0] /= out[3];
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out[1] /= out[3];
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out[2] /= out[3];
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objx.put(0, out[0]);
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objy.put(0, out[1]);
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objz.put(0, out[2]);
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return true;
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}
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/**
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* Method gluPickMatrix
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* @param x
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@ -138,11 +344,11 @@ public class Project extends Util implements GLUConstants {
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* @param viewport
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*/
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public static void gluPickMatrix(
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float x,
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float y,
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float deltax,
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float deltay,
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int[] viewport) {
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float x,
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float y,
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float deltax,
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float deltay,
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int[] viewport) {
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if (deltax <= 0 || deltay <= 0) {
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return;
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}
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