1 /* 2 * Copyright (C) 2011 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.example.android.basicglsurfaceview; 18 19 import java.io.IOException; 20 import java.io.InputStream; 21 import java.nio.ByteBuffer; 22 import java.nio.ByteOrder; 23 import java.nio.FloatBuffer; 24 25 import javax.microedition.khronos.egl.EGLConfig; 26 import javax.microedition.khronos.opengles.GL10; 27 28 import android.content.Context; 29 import android.graphics.Bitmap; 30 import android.graphics.BitmapFactory; 31 import android.opengl.GLES20; 32 import android.opengl.GLSurfaceView; 33 import android.opengl.GLUtils; 34 import android.opengl.Matrix; 35 import android.os.SystemClock; 36 import android.util.Log; 37 38 class GLES20TriangleRenderer implements GLSurfaceView.Renderer { 39 40 public GLES20TriangleRenderer(Context context) { 41 mContext = context; 42 mTriangleVertices = ByteBuffer.allocateDirect(mTriangleVerticesData.length 43 * FLOAT_SIZE_BYTES).order(ByteOrder.nativeOrder()).asFloatBuffer(); 44 mTriangleVertices.put(mTriangleVerticesData).position(0); 45 } 46 47 public void onDrawFrame(GL10 glUnused) { 48 // Ignore the passed-in GL10 interface, and use the GLES20 49 // class's static methods instead. 50 GLES20.glClearColor(0.0f, 0.0f, 1.0f, 1.0f); 51 GLES20.glClear( GLES20.GL_DEPTH_BUFFER_BIT | GLES20.GL_COLOR_BUFFER_BIT); 52 GLES20.glUseProgram(mProgram); 53 checkGlError("glUseProgram"); 54 55 GLES20.glActiveTexture(GLES20.GL_TEXTURE0); 56 GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, mTextureID); 57 58 mTriangleVertices.position(TRIANGLE_VERTICES_DATA_POS_OFFSET); 59 GLES20.glVertexAttribPointer(maPositionHandle, 3, GLES20.GL_FLOAT, false, 60 TRIANGLE_VERTICES_DATA_STRIDE_BYTES, mTriangleVertices); 61 checkGlError("glVertexAttribPointer maPosition"); 62 mTriangleVertices.position(TRIANGLE_VERTICES_DATA_UV_OFFSET); 63 GLES20.glEnableVertexAttribArray(maPositionHandle); 64 checkGlError("glEnableVertexAttribArray maPositionHandle"); 65 GLES20.glVertexAttribPointer(maTextureHandle, 2, GLES20.GL_FLOAT, false, 66 TRIANGLE_VERTICES_DATA_STRIDE_BYTES, mTriangleVertices); 67 checkGlError("glVertexAttribPointer maTextureHandle"); 68 GLES20.glEnableVertexAttribArray(maTextureHandle); 69 checkGlError("glEnableVertexAttribArray maTextureHandle"); 70 71 long time = SystemClock.uptimeMillis() % 4000L; 72 float angle = 0.090f * ((int) time); 73 Matrix.setRotateM(mMMatrix, 0, angle, 0, 0, 1.0f); 74 Matrix.multiplyMM(mMVPMatrix, 0, mVMatrix, 0, mMMatrix, 0); 75 Matrix.multiplyMM(mMVPMatrix, 0, mProjMatrix, 0, mMVPMatrix, 0); 76 77 GLES20.glUniformMatrix4fv(muMVPMatrixHandle, 1, false, mMVPMatrix, 0); 78 GLES20.glDrawArrays(GLES20.GL_TRIANGLES, 0, 3); 79 checkGlError("glDrawArrays"); 80 } 81 82 public void onSurfaceChanged(GL10 glUnused, int width, int height) { 83 // Ignore the passed-in GL10 interface, and use the GLES20 84 // class's static methods instead. 85 GLES20.glViewport(0, 0, width, height); 86 float ratio = (float) width / height; 87 Matrix.frustumM(mProjMatrix, 0, -ratio, ratio, -1, 1, 3, 7); 88 } 89 90 public void onSurfaceCreated(GL10 glUnused, EGLConfig config) { 91 // Ignore the passed-in GL10 interface, and use the GLES20 92 // class's static methods instead. 93 mProgram = createProgram(mVertexShader, mFragmentShader); 94 if (mProgram == 0) { 95 return; 96 } 97 maPositionHandle = GLES20.glGetAttribLocation(mProgram, "aPosition"); 98 checkGlError("glGetAttribLocation aPosition"); 99 if (maPositionHandle == -1) { 100 throw new RuntimeException("Could not get attrib location for aPosition"); 101 } 102 maTextureHandle = GLES20.glGetAttribLocation(mProgram, "aTextureCoord"); 103 checkGlError("glGetAttribLocation aTextureCoord"); 104 if (maTextureHandle == -1) { 105 throw new RuntimeException("Could not get attrib location for aTextureCoord"); 106 } 107 108 muMVPMatrixHandle = GLES20.glGetUniformLocation(mProgram, "uMVPMatrix"); 109 checkGlError("glGetUniformLocation uMVPMatrix"); 110 if (muMVPMatrixHandle == -1) { 111 throw new RuntimeException("Could not get attrib location for uMVPMatrix"); 112 } 113 114 /* 115 * Create our texture. This has to be done each time the 116 * surface is created. 117 */ 118 119 int[] textures = new int[1]; 120 GLES20.glGenTextures(1, textures, 0); 121 122 mTextureID = textures[0]; 123 GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, mTextureID); 124 125 GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MIN_FILTER, 126 GLES20.GL_NEAREST); 127 GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D, 128 GLES20.GL_TEXTURE_MAG_FILTER, 129 GLES20.GL_LINEAR); 130 131 GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_S, 132 GLES20.GL_REPEAT); 133 GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_T, 134 GLES20.GL_REPEAT); 135 136 InputStream is = mContext.getResources() 137 .openRawResource(R.raw.robot); 138 Bitmap bitmap; 139 try { 140 bitmap = BitmapFactory.decodeStream(is); 141 } finally { 142 try { 143 is.close(); 144 } catch(IOException e) { 145 // Ignore. 146 } 147 } 148 149 GLUtils.texImage2D(GLES20.GL_TEXTURE_2D, 0, bitmap, 0); 150 bitmap.recycle(); 151 152 Matrix.setLookAtM(mVMatrix, 0, 0, 0, -5, 0f, 0f, 0f, 0f, 1.0f, 0.0f); 153 } 154 155 private int loadShader(int shaderType, String source) { 156 int shader = GLES20.glCreateShader(shaderType); 157 if (shader != 0) { 158 GLES20.glShaderSource(shader, source); 159 GLES20.glCompileShader(shader); 160 int[] compiled = new int[1]; 161 GLES20.glGetShaderiv(shader, GLES20.GL_COMPILE_STATUS, compiled, 0); 162 if (compiled[0] == 0) { 163 Log.e(TAG, "Could not compile shader " + shaderType + ":"); 164 Log.e(TAG, GLES20.glGetShaderInfoLog(shader)); 165 GLES20.glDeleteShader(shader); 166 shader = 0; 167 } 168 } 169 return shader; 170 } 171 172 private int createProgram(String vertexSource, String fragmentSource) { 173 int vertexShader = loadShader(GLES20.GL_VERTEX_SHADER, vertexSource); 174 if (vertexShader == 0) { 175 return 0; 176 } 177 178 int pixelShader = loadShader(GLES20.GL_FRAGMENT_SHADER, fragmentSource); 179 if (pixelShader == 0) { 180 return 0; 181 } 182 183 int program = GLES20.glCreateProgram(); 184 if (program != 0) { 185 GLES20.glAttachShader(program, vertexShader); 186 checkGlError("glAttachShader"); 187 GLES20.glAttachShader(program, pixelShader); 188 checkGlError("glAttachShader"); 189 GLES20.glLinkProgram(program); 190 int[] linkStatus = new int[1]; 191 GLES20.glGetProgramiv(program, GLES20.GL_LINK_STATUS, linkStatus, 0); 192 if (linkStatus[0] != GLES20.GL_TRUE) { 193 Log.e(TAG, "Could not link program: "); 194 Log.e(TAG, GLES20.glGetProgramInfoLog(program)); 195 GLES20.glDeleteProgram(program); 196 program = 0; 197 } 198 } 199 return program; 200 } 201 202 private void checkGlError(String op) { 203 int error; 204 while ((error = GLES20.glGetError()) != GLES20.GL_NO_ERROR) { 205 Log.e(TAG, op + ": glError " + error); 206 throw new RuntimeException(op + ": glError " + error); 207 } 208 } 209 210 private static final int FLOAT_SIZE_BYTES = 4; 211 private static final int TRIANGLE_VERTICES_DATA_STRIDE_BYTES = 5 * FLOAT_SIZE_BYTES; 212 private static final int TRIANGLE_VERTICES_DATA_POS_OFFSET = 0; 213 private static final int TRIANGLE_VERTICES_DATA_UV_OFFSET = 3; 214 private final float[] mTriangleVerticesData = { 215 // X, Y, Z, U, V 216 -1.0f, -0.5f, 0, -0.5f, 0.0f, 217 1.0f, -0.5f, 0, 1.5f, -0.0f, 218 0.0f, 1.11803399f, 0, 0.5f, 1.61803399f }; 219 220 private FloatBuffer mTriangleVertices; 221 222 private final String mVertexShader = 223 "uniform mat4 uMVPMatrix;\n" + 224 "attribute vec4 aPosition;\n" + 225 "attribute vec2 aTextureCoord;\n" + 226 "varying vec2 vTextureCoord;\n" + 227 "void main() {\n" + 228 " gl_Position = uMVPMatrix * aPosition;\n" + 229 " vTextureCoord = aTextureCoord;\n" + 230 "}\n"; 231 232 private final String mFragmentShader = 233 "precision mediump float;\n" + 234 "varying vec2 vTextureCoord;\n" + 235 "uniform sampler2D sTexture;\n" + 236 "void main() {\n" + 237 " gl_FragColor = texture2D(sTexture, vTextureCoord);\n" + 238 "}\n"; 239 240 private float[] mMVPMatrix = new float[16]; 241 private float[] mProjMatrix = new float[16]; 242 private float[] mMMatrix = new float[16]; 243 private float[] mVMatrix = new float[16]; 244 245 private int mProgram; 246 private int mTextureID; 247 private int muMVPMatrixHandle; 248 private int maPositionHandle; 249 private int maTextureHandle; 250 251 private Context mContext; 252 private static String TAG = "GLES20TriangleRenderer"; 253 } 254
