19066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project/* 29066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Copyright (C) 2007 The Android Open Source Project 39066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 49066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Licensed under the Apache License, Version 2.0 (the "License"); 59066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * you may not use this file except in compliance with the License. 69066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * You may obtain a copy of the License at 79066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 89066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * http://www.apache.org/licenses/LICENSE-2.0 99066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Unless required by applicable law or agreed to in writing, software 119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * distributed under the License is distributed on an "AS IS" BASIS, 129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * See the License for the specific language governing permissions and 149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * limitations under the License. 159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectpackage android.opengl; 189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport javax.microedition.khronos.opengles.GL10; 209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project/** 229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * A set of GL utilities inspired by the OpenGL Utility Toolkit. 23b2e0cf3553ee5789e604dcb5483aa1d7e9ef2885Jack Palevich * 249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectpublic class GLU { 279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Return an error string from a GL or GLU error code. 30b2e0cf3553ee5789e604dcb5483aa1d7e9ef2885Jack Palevich * 319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param error - a GL or GLU error code. 329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return the error string for the input error code, or NULL if the input 339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * was not a valid GL or GLU error code. 349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public static String gluErrorString(int error) { 369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project switch (error) { 379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project case GL10.GL_NO_ERROR: 389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return "no error"; 399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project case GL10.GL_INVALID_ENUM: 409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return "invalid enum"; 419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project case GL10.GL_INVALID_VALUE: 429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return "invalid value"; 439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project case GL10.GL_INVALID_OPERATION: 449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return "invalid operation"; 459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project case GL10.GL_STACK_OVERFLOW: 469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return "stack overflow"; 479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project case GL10.GL_STACK_UNDERFLOW: 489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return "stack underflow"; 499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project case GL10.GL_OUT_OF_MEMORY: 509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return "out of memory"; 519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project default: 529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return null; 539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Define a viewing transformation in terms of an eye point, a center of 589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * view, and an up vector. 59b2e0cf3553ee5789e604dcb5483aa1d7e9ef2885Jack Palevich * 609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param gl a GL10 interface 619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param eyeX eye point X 629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param eyeY eye point Y 639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param eyeZ eye point Z 649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param centerX center of view X 659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param centerY center of view Y 669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param centerZ center of view Z 679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param upX up vector X 689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param upY up vector Y 699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param upZ up vector Z 709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public static void gluLookAt(GL10 gl, float eyeX, float eyeY, float eyeZ, 729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project float centerX, float centerY, float centerZ, float upX, float upY, 739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project float upZ) { 749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 75b2e0cf3553ee5789e604dcb5483aa1d7e9ef2885Jack Palevich float[] scratch = sScratch; 76b2e0cf3553ee5789e604dcb5483aa1d7e9ef2885Jack Palevich synchronized(scratch) { 77355c20cb9276148fd9b7074c5199aedeb497406eJack Palevich Matrix.setLookAtM(scratch, 0, eyeX, eyeY, eyeZ, centerX, centerY, centerZ, 78355c20cb9276148fd9b7074c5199aedeb497406eJack Palevich upX, upY, upZ); 79b2e0cf3553ee5789e604dcb5483aa1d7e9ef2885Jack Palevich gl.glMultMatrixf(scratch, 0); 80b2e0cf3553ee5789e604dcb5483aa1d7e9ef2885Jack Palevich } 819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Set up a 2D orthographic projection matrix 85b2e0cf3553ee5789e604dcb5483aa1d7e9ef2885Jack Palevich * 869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param gl 879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param left 889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param right 899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param bottom 909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param top 919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public static void gluOrtho2D(GL10 gl, float left, float right, 939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project float bottom, float top) { 949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project gl.glOrthof(left, right, bottom, top, -1.0f, 1.0f); 959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Set up a perspective projection matrix 99b2e0cf3553ee5789e604dcb5483aa1d7e9ef2885Jack Palevich * 1009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param gl a GL10 interface 1019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param fovy specifies the field of view angle, in degrees, in the Y 1029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * direction. 1039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param aspect specifies the aspect ration that determins the field of 1049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * view in the x direction. The aspect ratio is the ratio of x 1059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * (width) to y (height). 1069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param zNear specifies the distance from the viewer to the near clipping 1079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * plane (always positive). 1089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param zFar specifies the distance from the viewer to the far clipping 1099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * plane (always positive). 1109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public static void gluPerspective(GL10 gl, float fovy, float aspect, 1129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project float zNear, float zFar) { 1139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project float top = zNear * (float) Math.tan(fovy * (Math.PI / 360.0)); 1149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project float bottom = -top; 1159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project float left = bottom * aspect; 1169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project float right = top * aspect; 1179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project gl.glFrustumf(left, right, bottom, top, zNear, zFar); 1189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 1219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Map object coordinates into window coordinates. gluProject transforms the 1229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * specified object coordinates into window coordinates using model, proj, 1239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * and view. The result is stored in win. 1249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p> 1259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Note that you can use the OES_matrix_get extension, if present, to get 1269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * the current modelView and projection matrices. 127b2e0cf3553ee5789e604dcb5483aa1d7e9ef2885Jack Palevich * 1289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param objX object coordinates X 1299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param objY object coordinates Y 1309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param objZ object coordinates Z 1319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param model the current modelview matrix 1329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param modelOffset the offset into the model array where the modelview 1339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * maxtrix data starts. 1349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param project the current projection matrix 1359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param projectOffset the offset into the project array where the project 1369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * matrix data starts. 1379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param view the current view, {x, y, width, height} 1389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param viewOffset the offset into the view array where the view vector 1399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * data starts. 1409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param win the output vector {winX, winY, winZ}, that returns the 1419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * computed window coordinates. 1429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param winOffset the offset into the win array where the win vector data 1439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * starts. 1449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return A return value of GL_TRUE indicates success, a return value of 1459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * GL_FALSE indicates failure. 1469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public static int gluProject(float objX, float objY, float objZ, 1489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project float[] model, int modelOffset, float[] project, int projectOffset, 1499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int[] view, int viewOffset, float[] win, int winOffset) { 150b2e0cf3553ee5789e604dcb5483aa1d7e9ef2885Jack Palevich float[] scratch = sScratch; 151b2e0cf3553ee5789e604dcb5483aa1d7e9ef2885Jack Palevich synchronized(scratch) { 152b2e0cf3553ee5789e604dcb5483aa1d7e9ef2885Jack Palevich final int M_OFFSET = 0; // 0..15 153b2e0cf3553ee5789e604dcb5483aa1d7e9ef2885Jack Palevich final int V_OFFSET = 16; // 16..19 154b2e0cf3553ee5789e604dcb5483aa1d7e9ef2885Jack Palevich final int V2_OFFSET = 20; // 20..23 155b2e0cf3553ee5789e604dcb5483aa1d7e9ef2885Jack Palevich Matrix.multiplyMM(scratch, M_OFFSET, project, projectOffset, 156b2e0cf3553ee5789e604dcb5483aa1d7e9ef2885Jack Palevich model, modelOffset); 157b2e0cf3553ee5789e604dcb5483aa1d7e9ef2885Jack Palevich 158b2e0cf3553ee5789e604dcb5483aa1d7e9ef2885Jack Palevich scratch[V_OFFSET + 0] = objX; 159b2e0cf3553ee5789e604dcb5483aa1d7e9ef2885Jack Palevich scratch[V_OFFSET + 1] = objY; 160b2e0cf3553ee5789e604dcb5483aa1d7e9ef2885Jack Palevich scratch[V_OFFSET + 2] = objZ; 161b2e0cf3553ee5789e604dcb5483aa1d7e9ef2885Jack Palevich scratch[V_OFFSET + 3] = 1.0f; 162b2e0cf3553ee5789e604dcb5483aa1d7e9ef2885Jack Palevich 163b2e0cf3553ee5789e604dcb5483aa1d7e9ef2885Jack Palevich Matrix.multiplyMV(scratch, V2_OFFSET, 164b2e0cf3553ee5789e604dcb5483aa1d7e9ef2885Jack Palevich scratch, M_OFFSET, scratch, V_OFFSET); 165b2e0cf3553ee5789e604dcb5483aa1d7e9ef2885Jack Palevich 166b2e0cf3553ee5789e604dcb5483aa1d7e9ef2885Jack Palevich float w = scratch[V2_OFFSET + 3]; 167b2e0cf3553ee5789e604dcb5483aa1d7e9ef2885Jack Palevich if (w == 0.0f) { 168b2e0cf3553ee5789e604dcb5483aa1d7e9ef2885Jack Palevich return GL10.GL_FALSE; 169b2e0cf3553ee5789e604dcb5483aa1d7e9ef2885Jack Palevich } 170b2e0cf3553ee5789e604dcb5483aa1d7e9ef2885Jack Palevich 171b2e0cf3553ee5789e604dcb5483aa1d7e9ef2885Jack Palevich float rw = 1.0f / w; 172b2e0cf3553ee5789e604dcb5483aa1d7e9ef2885Jack Palevich 173b2e0cf3553ee5789e604dcb5483aa1d7e9ef2885Jack Palevich win[winOffset] = 174b2e0cf3553ee5789e604dcb5483aa1d7e9ef2885Jack Palevich view[viewOffset] + view[viewOffset + 2] 175b2e0cf3553ee5789e604dcb5483aa1d7e9ef2885Jack Palevich * (scratch[V2_OFFSET + 0] * rw + 1.0f) 176b2e0cf3553ee5789e604dcb5483aa1d7e9ef2885Jack Palevich * 0.5f; 177b2e0cf3553ee5789e604dcb5483aa1d7e9ef2885Jack Palevich win[winOffset + 1] = 178b2e0cf3553ee5789e604dcb5483aa1d7e9ef2885Jack Palevich view[viewOffset + 1] + view[viewOffset + 3] 179b2e0cf3553ee5789e604dcb5483aa1d7e9ef2885Jack Palevich * (scratch[V2_OFFSET + 1] * rw + 1.0f) * 0.5f; 180b2e0cf3553ee5789e604dcb5483aa1d7e9ef2885Jack Palevich win[winOffset + 2] = (scratch[V2_OFFSET + 2] * rw + 1.0f) * 0.5f; 1819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return GL10.GL_TRUE; 1849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 1879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Map window coordinates to object coordinates. gluUnProject maps the 1889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * specified window coordinates into object coordinates using model, proj, 1899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * and view. The result is stored in obj. 1909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p> 1919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Note that you can use the OES_matrix_get extension, if present, to get 1929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * the current modelView and projection matrices. 193b2e0cf3553ee5789e604dcb5483aa1d7e9ef2885Jack Palevich * 1949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param winX window coordinates X 1959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param winY window coordinates Y 1969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param winZ window coordinates Z 1979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param model the current modelview matrix 1989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param modelOffset the offset into the model array where the modelview 1999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * maxtrix data starts. 2009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param project the current projection matrix 2019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param projectOffset the offset into the project array where the project 2029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * matrix data starts. 2039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param view the current view, {x, y, width, height} 2049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param viewOffset the offset into the view array where the view vector 2059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * data starts. 2069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param obj the output vector {objX, objY, objZ}, that returns the 2079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * computed object coordinates. 2089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param objOffset the offset into the obj array where the obj vector data 2099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * starts. 2109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return A return value of GL10.GL_TRUE indicates success, a return value 2119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * of GL10.GL_FALSE indicates failure. 2129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 2139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public static int gluUnProject(float winX, float winY, float winZ, 2149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project float[] model, int modelOffset, float[] project, int projectOffset, 2159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int[] view, int viewOffset, float[] obj, int objOffset) { 216b2e0cf3553ee5789e604dcb5483aa1d7e9ef2885Jack Palevich float[] scratch = sScratch; 217b2e0cf3553ee5789e604dcb5483aa1d7e9ef2885Jack Palevich synchronized(scratch) { 218b2e0cf3553ee5789e604dcb5483aa1d7e9ef2885Jack Palevich final int PM_OFFSET = 0; // 0..15 219b2e0cf3553ee5789e604dcb5483aa1d7e9ef2885Jack Palevich final int INVPM_OFFSET = 16; // 16..31 220b2e0cf3553ee5789e604dcb5483aa1d7e9ef2885Jack Palevich final int V_OFFSET = 0; // 0..3 Reuses PM_OFFSET space 221b2e0cf3553ee5789e604dcb5483aa1d7e9ef2885Jack Palevich Matrix.multiplyMM(scratch, PM_OFFSET, project, projectOffset, 222b2e0cf3553ee5789e604dcb5483aa1d7e9ef2885Jack Palevich model, modelOffset); 223b2e0cf3553ee5789e604dcb5483aa1d7e9ef2885Jack Palevich 224b2e0cf3553ee5789e604dcb5483aa1d7e9ef2885Jack Palevich if (!Matrix.invertM(scratch, INVPM_OFFSET, scratch, PM_OFFSET)) { 225b2e0cf3553ee5789e604dcb5483aa1d7e9ef2885Jack Palevich return GL10.GL_FALSE; 226b2e0cf3553ee5789e604dcb5483aa1d7e9ef2885Jack Palevich } 227b2e0cf3553ee5789e604dcb5483aa1d7e9ef2885Jack Palevich 228b2e0cf3553ee5789e604dcb5483aa1d7e9ef2885Jack Palevich scratch[V_OFFSET + 0] = 229b2e0cf3553ee5789e604dcb5483aa1d7e9ef2885Jack Palevich 2.0f * (winX - view[viewOffset + 0]) / view[viewOffset + 2] 230b2e0cf3553ee5789e604dcb5483aa1d7e9ef2885Jack Palevich - 1.0f; 231b2e0cf3553ee5789e604dcb5483aa1d7e9ef2885Jack Palevich scratch[V_OFFSET + 1] = 232b2e0cf3553ee5789e604dcb5483aa1d7e9ef2885Jack Palevich 2.0f * (winY - view[viewOffset + 1]) / view[viewOffset + 3] 233b2e0cf3553ee5789e604dcb5483aa1d7e9ef2885Jack Palevich - 1.0f; 234b2e0cf3553ee5789e604dcb5483aa1d7e9ef2885Jack Palevich scratch[V_OFFSET + 2] = 2.0f * winZ - 1.0f; 235b2e0cf3553ee5789e604dcb5483aa1d7e9ef2885Jack Palevich scratch[V_OFFSET + 3] = 1.0f; 236b2e0cf3553ee5789e604dcb5483aa1d7e9ef2885Jack Palevich 237b2e0cf3553ee5789e604dcb5483aa1d7e9ef2885Jack Palevich Matrix.multiplyMV(obj, objOffset, scratch, INVPM_OFFSET, 238b2e0cf3553ee5789e604dcb5483aa1d7e9ef2885Jack Palevich scratch, V_OFFSET); 2399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return GL10.GL_TRUE; 2429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 244b2e0cf3553ee5789e604dcb5483aa1d7e9ef2885Jack Palevich private static final float[] sScratch = new float[32]; 2459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 246