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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.feedback;
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import android.opengl.EGL14;
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import android.content.Context;
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import android.content.res.Resources;
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import android.opengl.GLES30;
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import android.util.Log;
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import org.distorted.library.Distorted;
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import org.distorted.library.program.DistortedProgram;
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import java.io.InputStream;
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import java.nio.Buffer;
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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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/**
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* Created by izzy on 6/24/15. TransformFeedback is a example of how
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* to do transform feedback on Android using OpenGLES 3.0. Closely
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* follows the example found at https://open.gl/feedback.
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*
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* Assumes you have a working instance of GLSurfaceVew. Remember to call
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* setEGLContextClientVersion(3) to set the OpenGLES context to API 3.0
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* and have the appropriate OpenGLES specified in the Android manifest file.
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*/
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///////////////////////////////////////////////////////////////////////////////////////////////////
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public class TransformFeedback
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{
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private static DistortedProgram mFeedbackProgram;
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private static int mProgramHandle;
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public class TransformFeedback {
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private final String TAG = "TransformFeedback";
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// Vertex shader
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private final String vertexShaderSrc =
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"#version 300 es \n" +
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"in float inValue;\n" +
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"out float outValue;\n" +
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"void main() {\n" +
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" outValue = sqrt(inValue);\n" +
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"}";
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// Need a fragmentShader or glLinkProgram will throw
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private final String fragmentShaderCode =
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"#version 300 es \n" +
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"precision mediump float;\n" +
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"out vec4 fragColor;\n" +
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"void main() {\n" +
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" fragColor = vec4(1.0,1.0,1.0,1.0);\n" +
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"}";
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private final int mProgram;
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/**
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* The TransformFeedback constructor contains all the code to initialize
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* and draw the TransformFeedback, so create an instance of TransformFeedback
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* i.e. 'new TransformFeedBack()' in your 'GLRenderer.OnDrawFrame()' method.
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*/
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public TransformFeedback(){
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// Compile shaders
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int vertexShader = loadShader(GLES30.GL_VERTEX_SHADER , vertexShaderSrc );
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int fragmentShader = loadShader(GLES30.GL_FRAGMENT_SHADER, fragmentShaderCode);
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// Create program and attach shaders
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mProgram = GLES30.glCreateProgram();
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GLES30.glAttachShader(mProgram, vertexShader);
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GLES30.glAttachShader(mProgram, fragmentShader);
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// Tell GL where the feedbackVaryings are in the shader before Linking
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// the shaders together to form a program.
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final String[] feedbackVaryings = { "outValue" };
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GLES30.glTransformFeedbackVaryings(mProgram, feedbackVaryings, GLES30.GL_INTERLEAVED_ATTRIBS);
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checkGlError(TAG + " glTransformFeedbackVaryings");
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///////////////////////////////////////////////////////////////////////////////////////////////////
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// Link program and look for errors
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GLES30.glLinkProgram(mProgram);
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public TransformFeedback(final Context context)
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{
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final Resources resources = context.getResources();
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final InputStream vertStream = resources.openRawResource(org.distorted.library.R.raw.feedback_vertex_shader);
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final InputStream fragStream = resources.openRawResource(org.distorted.library.R.raw.feedback_fragment_shader);
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int[] linkSuccessful = new int[1];
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GLES30.glGetProgramiv(mProgram, GLES30.GL_LINK_STATUS, linkSuccessful, 0);
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String vertHeader= Distorted.GLSL_VERSION;
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String fragHeader= Distorted.GLSL_VERSION;
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String[] feedback = { "outValue" };
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if (linkSuccessful[0] != 1){
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Log.d(TAG, "glLinkProgram failed");
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try
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{
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mFeedbackProgram = new DistortedProgram(vertStream,fragStream, vertHeader, fragHeader, Distorted.GLSL, feedback );
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mProgramHandle = mFeedbackProgram.getProgramHandle();
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}
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catch(Exception ex)
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{
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Log.e("TransformFeedback", "exception creating feedback program: "+ex.getMessage());
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}
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}
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checkGlError(TAG + " glLinkProgram");
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/***********
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* Begin Rendering process
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* everything before this can be moved to an initialization stage
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***********/
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///////////////////////////////////////////////////////////////////////////////////////////////////
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// Bring the program into use
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GLES30.glUseProgram(mProgram);
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checkGlError(TAG + " glUseProgram");
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void render()
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{
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GLES30.glUseProgram(mProgramHandle);
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checkGlError("glUseProgram");
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// Create data to fill VBO
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float[] floatData = { 1.0f, 4.0f, 9.0f, 16.0f, 25.0f, 100.0f };
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int bufferLength = floatData.length * 4;
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FloatBuffer data = ByteBuffer.allocateDirect(bufferLength)
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.order(ByteOrder.nativeOrder()).asFloatBuffer();
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FloatBuffer data = ByteBuffer.allocateDirect(bufferLength).order(ByteOrder.nativeOrder()).asFloatBuffer();
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data.put(floatData).position(0);
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// Create VBO and fill with data
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GLES30.glGenBuffers(1, vbo, 0);
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GLES30.glBindBuffer(GLES30.GL_ARRAY_BUFFER, vbo[0]);
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GLES30.glBufferData(GLES30.GL_ARRAY_BUFFER, bufferLength, data, GLES30.GL_STATIC_READ);
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checkGlError(TAG + " glBufferData GL_ARRAY_BUFFER");
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checkGlError("glBufferData GL_ARRAY_BUFFER");
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// Link created VBO to shader attribute "inValue"
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int inputAttrib = GLES30.glGetAttribLocation(mProgram, "inValue");
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int inputAttrib = GLES30.glGetAttribLocation(mProgramHandle, "inValue");
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GLES30.glEnableVertexAttribArray(inputAttrib);
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GLES30.glVertexAttribPointer(inputAttrib, 1, GLES30.GL_FLOAT, false, 4, 0);
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checkGlError(TAG + " glVertexAttribPointer");
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checkGlError("glVertexAttribPointer");
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// Create transform feedback buffer object and bind to transform feedback
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// this creates space in a buffer object for the TransformFeedback.
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GLES30.glBufferData(GLES30.GL_TRANSFORM_FEEDBACK_BUFFER, bufferLength, null, GLES30.GL_STATIC_READ);
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GLES30.glBindBufferBase(GLES30.GL_TRANSFORM_FEEDBACK_BUFFER, 0, tbo[0]); //very important
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checkGlError(TAG + " glBindBufferBase");
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checkGlError("glBindBufferBase");
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// Disable Rasterizer if you just need the data
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GLES30.glEnable(GLES30.GL_RASTERIZER_DISCARD);
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// Start the TransformFeedback, Draw the Arrays, then End the Transform Feedback
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GLES30.glBeginTransformFeedback(GLES30.GL_POINTS);
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GLES30.glDrawArrays(GLES30.GL_POINTS, 0, bufferLength);
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checkGlError(TAG + " glDrawArrays");
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checkGlError("glDrawArrays");
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GLES30.glEndTransformFeedback();
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// Reenable Rasterizer if you need it, which you do if you are drawing anything.
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// Flush out anything in GL before mapping the buffer.
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GLES30.glFlush();
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checkGlError(TAG + " pre-glMapBufferRange ");
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checkGlError("pre-glMapBufferRange ");
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// Map the transform feedback buffer to local address space.
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Buffer mappedBuffer = GLES30.glMapBufferRange(GLES30.GL_TRANSFORM_FEEDBACK_BUFFER,
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0, bufferLength, GLES30.GL_MAP_READ_BIT);
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checkGlError(TAG + " glMapBufferRange");
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checkGlError("glMapBufferRange");
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// Read out the data, here we write to logcat.
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if (mappedBuffer!=null){
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bb.order(ByteOrder.nativeOrder());
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FloatBuffer transformedData = bb.asFloatBuffer();
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Log.d(TAG, String.format("output values = %f %f %f %f %f %f\n",
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Log.d( "TransofrmFeedback", String.format("output values = %f %f %f %f %f %f\n",
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transformedData.get(), transformedData.get(), transformedData.get(),
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transformedData.get(), transformedData.get(), transformedData.get() ));
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}
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// Don't forget to Unmap the Transform Feeback Buffer.
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GLES30.glUnmapBuffer(GLES30.GL_TRANSFORM_FEEDBACK_BUFFER);
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////
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private static void checkGlError(String op)
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{
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int error = GLES30.glGetError();
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if (error != GLES30.GL_NO_ERROR)
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{
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String msg = op + ": glError 0x" + Integer.toHexString(error);
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throw new RuntimeException(msg);
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}
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////
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private static int loadShader(final int shaderType, final String shaderSource)
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{
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int shaderHandle = GLES30.glCreateShader(shaderType);
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if (shaderHandle != 0)
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private static void checkGlError(String op)
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{
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GLES30.glShaderSource(shaderHandle, shaderSource);
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GLES30.glCompileShader(shaderHandle);
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final int[] compileStatus = new int[1];
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GLES30.glGetShaderiv(shaderHandle, GLES30.GL_COMPILE_STATUS, compileStatus, 0);
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int error = GLES30.glGetError();
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if (compileStatus[0] != GLES30.GL_TRUE )
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if (error != GLES30.GL_NO_ERROR)
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{
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GLES30.glDeleteShader(shaderHandle);
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shaderHandle = 0;
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String msg = op + ": glError 0x" + Integer.toHexString(error);
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throw new RuntimeException(msg);
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}
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}
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if (shaderHandle == 0)
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{
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String error = GLES30.glGetShaderInfoLog(shaderHandle);
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android.util.Log.e("Program", "error compiling :"+error);
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}
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return shaderHandle;
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}
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}
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Progress with moving the Transform Feedback functionality from the APP to the library.