Revision a5973e7d
Added by Leszek Koltunski about 7 years ago
src/main/java/org/distorted/examples/feedback/TransformFeedback.java | ||
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/////////////////////////////////////////////////////////////////////////////////////////////////// |
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public class TransformFeedback
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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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private DistortedProgram mFeedbackProgram; |
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private int mBufferLength; |
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private int[] mVBO, mTBO; |
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/////////////////////////////////////////////////////////////////////////////////////////////////// |
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public TransformFeedback(final Context context)
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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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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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float[] floatData = { 2.0f, 4.0f, 9.0f, 16.0f, 25.0f, 100.0f }; |
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mBufferLength = floatData.length * 4; |
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FloatBuffer data = ByteBuffer.allocateDirect(mBufferLength).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, mBufferLength, data, GLES30.GL_STATIC_READ); |
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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, mBufferLength, null, GLES30.GL_STATIC_READ); |
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} |
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/////////////////////////////////////////////////////////////////////////////////////////////////// |
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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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mFeedbackProgram.useProgram(); |
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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).order(ByteOrder.nativeOrder()).asFloatBuffer(); |
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data.put(floatData).position(0); |
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GLES30.glBindBuffer(GLES30.GL_ARRAY_BUFFER, mVBO[0]); |
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GLES30.glVertexAttribPointer(mFeedbackProgram.mAttribute[0], 1, GLES30.GL_FLOAT, false, 4, 0); |
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GLES30.glBindBufferBase(GLES30.GL_TRANSFORM_FEEDBACK_BUFFER, 0, mTBO[0]); |
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// Create VBO and fill with data |
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int[] vbo = new int[1]; |
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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("glBufferData GL_ARRAY_BUFFER"); |
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// Link created VBO to shader attribute "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("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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int[] tbo = new int[1]; |
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GLES30.glGenBuffers(1, tbo, 0); |
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GLES30.glBindBuffer(GLES30.GL_TRANSFORM_FEEDBACK_BUFFER, tbo[0]); |
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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("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("glDrawArrays"); |
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GLES30.glDrawArrays(GLES30.GL_POINTS, 0, mBufferLength); |
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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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GLES30.glDisable(GLES30.GL_RASTERIZER_DISCARD); |
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// Flush out anything in GL before mapping the buffer. |
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GLES30.glFlush(); |
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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("glMapBufferRange"); |
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Buffer mappedBuffer = GLES30.glMapBufferRange(GLES30.GL_TRANSFORM_FEEDBACK_BUFFER, 0, mBufferLength, GLES30.GL_MAP_READ_BIT); |
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// Read out the data, here we write to logcat.
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if (mappedBuffer!=null){
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if (mappedBuffer!=null)
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{
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ByteBuffer bb = ((ByteBuffer) mappedBuffer); |
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bb.order(ByteOrder.nativeOrder()); |
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FloatBuffer transformedData = bb.asFloatBuffer(); |
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Log.d( "TransofrmFeedback", String.format("output values = %f %f %f %f %f %f\n",
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Log.d( "TransformFeedback", 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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/////////////////////////////////////////////////////////////////////////////////////////////////// |
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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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GLES30.glUnmapBuffer(GLES30.GL_TRANSFORM_FEEDBACK_BUFFER); |
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} |
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} |
Also available in: Unified diff
Progress with moving Transform Feedback into library.