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///////////////////////////////////////////////////////////////////////////////////////////////////
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// Copyright 2016 Leszek Koltunski //
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// //
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// This file is part of Distorted. //
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// //
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// Distorted is free software: you can redistribute it and/or modify //
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// it under the terms of the GNU General Public License as published by //
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// the Free Software Foundation, either version 2 of the License, or //
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// (at your option) any later version. //
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// //
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// Distorted is distributed in the hope that it will be useful, //
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// but WITHOUT ANY WARRANTY; without even the implied warranty of //
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
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// GNU General Public License for more details. //
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// //
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// You should have received a copy of the GNU General Public License //
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// along with Distorted. If not, see <http://www.gnu.org/licenses/>. //
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///////////////////////////////////////////////////////////////////////////////////////////////////
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package org.distorted.examples.aroundtheworld;
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import java.nio.ByteBuffer;
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import java.nio.ByteOrder;
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import java.nio.FloatBuffer;
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import javax.microedition.khronos.egl.EGLConfig;
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import javax.microedition.khronos.opengles.GL10;
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import android.opengl.GLES20;
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import android.opengl.GLSurfaceView;
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import android.opengl.Matrix;
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///////////////////////////////////////////////////////////////////////////////////////////////////
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class AroundTheWorldRendererPicker implements GLSurfaceView.Renderer
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{
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private float[] mModelMatrix = new float[16];
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private float[] mViewMatrix = new float[16];
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private float[] mProjectionMatrix = new float[16];
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private float[] mMVPMatrix = new float[16];
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private final FloatBuffer mTriangleVertices;
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private int mMVPMatrixHandle;
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private int mPositionHandle;
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private int mColorHandle;
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private final int mBytesPerFloat = 4;
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private final int mStrideBytes = 7 * mBytesPerFloat;
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private final int mPositionOffset = 0;
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private final int mPositionDataSize = 3;
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private final int mColorOffset = 3;
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private final int mColorDataSize = 4;
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///////////////////////////////////////////////////////////////////////////////////////////////////
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AroundTheWorldRendererPicker()
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{
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final float[] triangle1VerticesData = {
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-0.25f, 0.5f, 0.0f, // x,y,z
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1.0f, 1.0f, 1.0f, 1.0f, // r,g,b
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-0.25f, -0.5f, 0.0f,
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0.0f, 0.0f, 0.0f, 1.0f,
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0.559f, 0.0f, 0.0f,
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0.3f, 0.3f, 0.0f, 1.0f };
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mTriangleVertices = ByteBuffer.allocateDirect(triangle1VerticesData.length * mBytesPerFloat).order(ByteOrder.nativeOrder()).asFloatBuffer();
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mTriangleVertices.put(triangle1VerticesData).position(0);
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////
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@Override public void onSurfaceCreated(GL10 glUnused, EGLConfig config)
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{
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GLES20.glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
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final float eyeX = 0.0f;
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final float eyeY = 0.0f;
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final float eyeZ = 1.5f;
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final float lookX = 0.0f;
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final float lookY = 0.0f;
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final float lookZ = -5.0f;
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final float upX = 0.0f;
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final float upY = 1.0f;
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final float upZ = 0.0f;
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Matrix.setLookAtM(mViewMatrix, 0, eyeX, eyeY, eyeZ, lookX, lookY, lookZ, upX, upY, upZ);
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final String vertexShader =
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"uniform mat4 u_MVPMatrix; \n"
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+ "attribute vec4 a_Position; \n"
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+ "attribute vec4 a_Color; \n"
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+ "varying vec4 v_Color; \n"
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+ "void main() \n"
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+ "{ \n"
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+ " v_Color = a_Color; \n"
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+ " gl_Position = u_MVPMatrix* a_Position; \n"
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+ "} \n";
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final String fragmentShader =
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"precision mediump float; \n"
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+ "varying vec4 v_Color; \n"
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+ "void main() \n"
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+ "{ \n"
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+ " gl_FragColor = v_Color; \n"
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+ "} \n";
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int vertexShaderHandle = GLES20.glCreateShader(GLES20.GL_VERTEX_SHADER);
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if (vertexShaderHandle != 0)
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{
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GLES20.glShaderSource(vertexShaderHandle, vertexShader);
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GLES20.glCompileShader(vertexShaderHandle);
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final int[] compileStatus = new int[1];
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GLES20.glGetShaderiv(vertexShaderHandle, GLES20.GL_COMPILE_STATUS, compileStatus, 0);
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if (compileStatus[0] == 0)
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{
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GLES20.glDeleteShader(vertexShaderHandle);
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vertexShaderHandle = 0;
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}
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}
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if (vertexShaderHandle == 0)
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{
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throw new RuntimeException("Error creating vertex shader.");
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}
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int fragmentShaderHandle = GLES20.glCreateShader(GLES20.GL_FRAGMENT_SHADER);
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if (fragmentShaderHandle != 0)
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{
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GLES20.glShaderSource(fragmentShaderHandle, fragmentShader);
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GLES20.glCompileShader(fragmentShaderHandle);
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final int[] compileStatus = new int[1];
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GLES20.glGetShaderiv(fragmentShaderHandle, GLES20.GL_COMPILE_STATUS, compileStatus, 0);
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if (compileStatus[0] == 0)
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{
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GLES20.glDeleteShader(fragmentShaderHandle);
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fragmentShaderHandle = 0;
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}
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}
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if (fragmentShaderHandle == 0)
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{
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throw new RuntimeException("Error creating fragment shader.");
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}
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int programHandle = GLES20.glCreateProgram();
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if (programHandle != 0)
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{
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GLES20.glAttachShader(programHandle, vertexShaderHandle);
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GLES20.glAttachShader(programHandle, fragmentShaderHandle);
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GLES20.glBindAttribLocation(programHandle, 0, "a_Position");
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GLES20.glBindAttribLocation(programHandle, 1, "a_Color");
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GLES20.glLinkProgram(programHandle);
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final int[] linkStatus = new int[1];
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GLES20.glGetProgramiv(programHandle, GLES20.GL_LINK_STATUS, linkStatus, 0);
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if (linkStatus[0] == 0)
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{
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GLES20.glDeleteProgram(programHandle);
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programHandle = 0;
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}
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}
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if (programHandle == 0)
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{
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throw new RuntimeException("Error creating program.");
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}
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mMVPMatrixHandle = GLES20.glGetUniformLocation(programHandle, "u_MVPMatrix");
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mPositionHandle = GLES20.glGetAttribLocation(programHandle, "a_Position");
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mColorHandle = GLES20.glGetAttribLocation(programHandle, "a_Color");
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GLES20.glUseProgram(programHandle);
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////
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@Override public void onSurfaceChanged(GL10 glUnused, int width, int height)
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{
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GLES20.glViewport(0, 0, width, height);
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final float ratio = (float) width / height;
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final float left = -ratio;
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final float right = ratio;
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final float bottom = -1.0f;
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final float top = 1.0f;
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final float near = 1.0f;
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final float far = 10.0f;
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Matrix.frustumM(mProjectionMatrix, 0, left, right, bottom, top, near, far);
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////
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@Override public void onDrawFrame(GL10 glUnused)
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{
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GLES20.glClear(GLES20.GL_DEPTH_BUFFER_BIT | GLES20.GL_COLOR_BUFFER_BIT);
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Matrix.setIdentityM(mModelMatrix, 0);
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mTriangleVertices.position(mPositionOffset);
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GLES20.glVertexAttribPointer(mPositionHandle, mPositionDataSize, GLES20.GL_FLOAT, false, mStrideBytes, mTriangleVertices);
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GLES20.glEnableVertexAttribArray(mPositionHandle);
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mTriangleVertices.position(mColorOffset);
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GLES20.glVertexAttribPointer(mColorHandle, mColorDataSize, GLES20.GL_FLOAT, false, mStrideBytes, mTriangleVertices);
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GLES20.glEnableVertexAttribArray(mColorHandle);
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Matrix.multiplyMM(mMVPMatrix, 0, mViewMatrix, 0, mModelMatrix, 0);
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Matrix.multiplyMM(mMVPMatrix, 0, mProjectionMatrix, 0, mMVPMatrix, 0);
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GLES20.glUniformMatrix4fv(mMVPMatrixHandle, 1, false, mMVPMatrix, 0);
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GLES20.glDrawArrays(GLES20.GL_TRIANGLES, 0, 3);
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}
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}
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