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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.content.res.Resources;
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import android.opengl.GLES30;
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import android.opengl.GLSurfaceView;
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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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import javax.microedition.khronos.egl.EGLConfig;
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import javax.microedition.khronos.opengles.GL10;
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///////////////////////////////////////////////////////////////////////////////////////////////////
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class FeedbackRenderer implements GLSurfaceView.Renderer
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{
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private final int BYTESFLOAT = 4;
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private final int POSITION = 3;
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private final boolean USEPOINTS=false;
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private GLSurfaceView mView;
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private DistortedProgram mFeedbackProgram;
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private int mVertices;
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private int[] mVBO, mTBO;
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///////////////////////////////////////////////////////////////////////////////////////////////////
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FeedbackRenderer(GLSurfaceView v)
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{
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mView = v;
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////
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public void onDrawFrame(GL10 glUnused)
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{
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mFeedbackProgram.useProgram();
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GLES30.glBindBuffer(GLES30.GL_ARRAY_BUFFER, mVBO[0]);
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GLES30.glVertexAttribPointer(mFeedbackProgram.mAttribute[0], POSITION, GLES30.GL_FLOAT, false, 0, 0);
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GLES30.glBindBufferBase(GLES30.GL_TRANSFORM_FEEDBACK_BUFFER, 0, mTBO[0]);
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GLES30.glEnable(GLES30.GL_RASTERIZER_DISCARD);
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GLES30.glBeginTransformFeedback( USEPOINTS ? GLES30.GL_POINTS : GLES30.GL_TRIANGLES);
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GLES30.glDrawArrays( USEPOINTS ? GLES30.GL_POINTS : GLES30.GL_TRIANGLES, 0, mVertices);
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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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throw new RuntimeException("DrawArrays: glError 0x" + Integer.toHexString(error));
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}
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GLES30.glEndTransformFeedback();
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GLES30.glDisable(GLES30.GL_RASTERIZER_DISCARD);
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GLES30.glFlush();
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Buffer mappedBuffer = GLES30.glMapBufferRange(GLES30.GL_TRANSFORM_FEEDBACK_BUFFER, 0, mVertices*POSITION*BYTESFLOAT, GLES30.GL_MAP_READ_BIT);
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FloatBuffer fb = ((ByteBuffer) mappedBuffer).order(ByteOrder.nativeOrder()).asFloatBuffer();
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String msg = "";
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for(int i=0; i<mVertices*POSITION; i++) msg += (" "+fb.get(i));
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android.util.Log.d( "Feedback", msg);
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GLES30.glUnmapBuffer(GLES30.GL_TRANSFORM_FEEDBACK_BUFFER);
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GLES30.glBindBuffer(GLES30.GL_ARRAY_BUFFER, 0);
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////
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public void onSurfaceChanged(GL10 glUnused, int width, int height)
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{
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////
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public void onSurfaceCreated(GL10 glUnused, EGLConfig config)
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{
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try
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{
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Distorted.onCreate(mView.getContext());
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}
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catch(Exception ex)
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{
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android.util.Log.e("Feedback", ex.getMessage() );
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}
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final Resources resources = mView.getContext().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 glsl = 300;
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String header= "#version 300 es\n";
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String[] feedback = { "outValue" };
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try
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{
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mFeedbackProgram = new DistortedProgram(vertStream,fragStream, header, header, glsl, feedback );
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}
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catch(Exception ex)
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{
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android.util.Log.e("Feedback", "exception creating feedback program: "+ex.getMessage());
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}
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float[] floatData = { 1.0f, 4.0f, 9.0f,
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16.0f, 25.0f, 36.0f,
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49.0f, 64.0f, 81.0f,
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100.0f,121.0f,144.0f,
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1.0f, 4.0f, 9.0f,
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16.0f, 25.0f, 36.0f
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};
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mVertices = floatData.length/POSITION;
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FloatBuffer data = ByteBuffer.allocateDirect(mVertices*POSITION*BYTESFLOAT).order(ByteOrder.nativeOrder()).asFloatBuffer();
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data.put(floatData).position(0);
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mVBO = new int[1];
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GLES30.glGenBuffers(1, mVBO, 0);
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GLES30.glBindBuffer(GLES30.GL_ARRAY_BUFFER, mVBO[0]);
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GLES30.glBufferData(GLES30.GL_ARRAY_BUFFER, mVertices*POSITION*BYTESFLOAT, data, GLES30.GL_STATIC_DRAW);
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GLES30.glBindBuffer(GLES30.GL_ARRAY_BUFFER, 0);
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mTBO = new int[1];
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GLES30.glGenBuffers(1, mTBO, 0);
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GLES30.glBindBuffer(GLES30.GL_TRANSFORM_FEEDBACK_BUFFER, mTBO[0]);
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GLES30.glBufferData(GLES30.GL_TRANSFORM_FEEDBACK_BUFFER, mVertices*POSITION*BYTESFLOAT, null, GLES30.GL_STATIC_READ);
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GLES30.glBindBuffer(GLES30.GL_TRANSFORM_FEEDBACK_BUFFER, 0);
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}
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}
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