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 * Copyright (c) 2009-2016 jMonkeyEngine
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 *
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 * modification, are permitted provided that the following conditions are
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 *
 * * Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 *
 * * Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
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 *   may be used to endorse or promote products derived from this software
 *   without specific prior written permission.
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package com.jme3.opencl.jocl;

import com.jme3.opencl.*;
import com.jogamp.common.nio.PointerBuffer;
import com.jogamp.opencl.CLPlatform;
import com.jogamp.opencl.CLProgram;
import com.jogamp.opencl.llb.CL;
import com.jogamp.opencl.util.CLUtil;
import java.nio.ByteBuffer;
import java.util.logging.Level;
import java.util.logging.Logger;

import static com.jogamp.common.nio.Buffers.newDirectByteBuffer;
/**
 *
 * @author shaman
 */
public class JoclProgram extends Program {
    private static final Logger LOG = Logger.getLogger(JoclProgram.class.getName());
    
    final long program;
    final CL cl;
    private final JoclContext context;

    public JoclProgram(long program, JoclContext context) {
        super(new ReleaserImpl(program));
        this.program = program;
        this.context = context;
        this.cl = CLPlatform.getLowLevelCLInterface();
    }

    @Override
    public void build(String args, Device... devices) throws KernelCompilationException {
        PointerBuffer deviceList = null;
        int deviceCount = 0;
        if (devices != null) {
            deviceList = PointerBuffer.allocateDirect(devices.length);
            for (Device d : devices) {
                deviceList.put(((JoclDevice) d).id);
            }
            deviceCount = devices.length;
            deviceList.rewind();
        }
        int ret = cl.clBuildProgram(program, deviceCount, deviceList, args, null);
        if (ret != CL.CL_SUCCESS) {
            String log = Log();
            LOG.log(Level.WARNING, "Unable to compile program:\n{0}", log);
            if (ret == CL.CL_BUILD_PROGRAM_FAILURE) {
                throw new KernelCompilationException("Failed to build program", ret, log);
            } else {
                Utils.checkError(ret, "clBuildProgram");
            }
        } else {
            LOG.log(Level.INFO, "Program compiled:\n{0}", Log());
        }
    }
    
    private String Log(long device) {
        Utils.pointers[0].rewind();
        int ret = cl.clGetProgramBuildInfo(program, device, CL.CL_PROGRAM_BUILD_LOG, 0, null, Utils.pointers[0]);
        Utils.checkError(ret, "clGetProgramBuildInfo");
        int count = (int) Utils.pointers[0].get(0);
        final ByteBuffer buffer = newDirectByteBuffer(count);
        ret = cl.clGetProgramBuildInfo(program, device, CL.CL_PROGRAM_BUILD_LOG, buffer.capacity(), buffer, null);
        Utils.checkError(ret, "clGetProgramBuildInfo");
        return CLUtil.clString2JavaString(buffer, count);
    }
    
    private String Log() {
        StringBuilder str = new StringBuilder();
        for (JoclDevice device : context.getDevices()) {
            long d = device.id;
            str.append(device.getName()).append(":\n");
            str.append(Log(d));
            str.append('\n');
        }
        return str.toString();
    }

    @Override
    public Kernel createKernel(String name) {
        Utils.errorBuffer.rewind();
        long kernel = cl.clCreateKernel(program, name, Utils.errorBuffer);
        Utils.checkError(Utils.errorBuffer, "clCreateKernel");
        return new JoclKernel(kernel);
    }

    @Override
    public Kernel[] createAllKernels() {
        Utils.tempBuffers[0].b16i.rewind();
        int ret = cl.clCreateKernelsInProgram(program, 0, null, Utils.tempBuffers[0].b16i);
        Utils.checkError(ret, "clCreateKernelsInProgram");
        int count = Utils.tempBuffers[0].b16i.get(0);
        PointerBuffer buf = PointerBuffer.allocateDirect(count);
        ret = cl.clCreateKernelsInProgram(program, count, buf, null);
        Utils.checkError(ret, "clCreateKernelsInProgram");
        Kernel[] kx = new Kernel[count];
        for (int i=0; i<count; ++i) {
            kx[i] = new JoclKernel(buf.get());
        }
        return kx;
    }

    @Override
    public ByteBuffer getBinary(Device device) {
        //There is no way to do this in Jocl:
        //The low-level bindings need a buffer of adresses to buffers. For that
        //the class InternalBufferUtil is used, but this class is not public.
        //I also can't create a temporal instance of CLProgram because the constructor
        //that takes only the native pointer is private.
        //So the only way would be to create the CLProgram directly from the beginning.
        //I don't want to do this because then I would have to use the whole 
        //bunch of garbage the CLProgram class is doing in background.
        throw new UnsupportedOperationException("Jocl does not expose this operation");
    }

    private static class ReleaserImpl implements ObjectReleaser {
        private long program;
        private ReleaserImpl(long program) {
            this.program = program;
        }
        @Override
        public void release() {
            if (program != 0) {
                int ret = CLPlatform.getLowLevelCLInterface().clReleaseProgram(program);
                program = 0;
                Utils.reportError(ret, "clReleaseProgram");
            }
        }
    }
}
