#include "cl_helpers.h"
#include <cmath>
#include <ctime>
#include <vector>
#include <sstream>
#include <iostream>
#include <iterator>
#include <algorithm>
using namespace cl;
using namespace std;
const unsigned DIMX = 640;
const unsigned DIMY = 480;
const float MINIMUM = 1.0f;
const float MAXIMUM = 20.f;
const float STEP    = 2.0f;
const int NELEMS    = (MAXIMUM-MINIMUM+1)/STEP;
#define USE_FORGE_OPENCL_COPY_HELPERS
static const std::string streamKernel =
R"EOK(
constant float AF_BLUE[4] = {0.0588f , 0.1137f , 0.2745f , 1.0f};
constant float AF_ORANGE[4] = {0.8588f , 0.6137f , 0.0745f , 1.0f};
kernel
void genColorsKernel(global float* colors, int NELEMS)
{
    const size_t nelems = NELEMS * NELEMS * NELEMS;
    int i = get_global_id(0);
    if (i<nelems) {
        if (i%2==0) {
            colors[3*i+0] = AF_ORANGE[0];
            colors[3*i+1] = AF_ORANGE[1];
            colors[3*i+2] = AF_ORANGE[2];
        } else {
            colors[3*i+0] = AF_BLUE[0];
            colors[3*i+1] = AF_BLUE[1];
            colors[3*i+2] = AF_BLUE[2];
        }
    }
}
kernel
void pointGenKernel(global float* points, global float* dirs, int nBBS0,
                    int NELEMS, float MINIMUM, float STEP)
{
    int k = get_group_id(0) / nBBS0;
    int i = get_local_size(0) * (get_group_id(0)-k*nBBS0) + get_local_id(0);
    int j = get_global_id(1);
    if (i<NELEMS && j<NELEMS && k<NELEMS) {
        float x = MINIMUM + i*STEP;
        float y = MINIMUM + j*STEP;
        float z = MINIMUM + k*STEP;
        int id = i + j * NELEMS + k * NELEMS*NELEMS;
        points[3*id+0] = x;
        points[3*id+1] = y;
        points[3*id+2] = z;
        dirs[3*id+0] = x-10.f;
        dirs[3*id+1] = y-10.f;
        dirs[3*id+2] = z-10.f;
    }
}
)EOK";
inline int divup(int a, int b)
{
    return (a+b-1)/b;
}
void generatePoints(Buffer& points, Buffer &dirs, Buffer& colors,
                    CommandQueue& queue, Device& device)
{
    static bool compileFlag = true;
    static cl::Program prog;
    static cl::Kernel  pointGenKernel;
    static cl::Kernel  colorsKernel;
    if (compileFlag) {
        try {
            prog = cl::Program(queue.getInfo<CL_QUEUE_CONTEXT>(), streamKernel, false);
            std::vector<cl::Device> devs;
            devs.push_back(device);
            prog.build(devs);
            pointGenKernel = cl::Kernel(prog, "pointGenKernel");
            colorsKernel   = cl::Kernel(prog, "genColorsKernel");
        } catch (cl::Error err) {
            std::cout << "Compile Errors: " << std::endl;
            std::cout << err.what() << err.err() << std::endl;
            std::cout << prog.getBuildInfo<CL_PROGRAM_BUILD_LOG>(device) << std::endl;
            exit(255);
        }
        std::cout<< "Kernels compiled successfully" << std::endl;
        compileFlag = false;
    }
    static const NDRange local(8, 8);
    int blk_x = divup(NELEMS, local[0]);
    int blk_y = divup(NELEMS, local[1]);
    NDRange global(NELEMS * local[0] * blk_x, local[1] * blk_y);
    pointGenKernel.setArg(0, points);
    pointGenKernel.setArg(1, dirs);
    pointGenKernel.setArg(2, blk_x);
    pointGenKernel.setArg(3, NELEMS);
    pointGenKernel.setArg(4, MINIMUM);
    pointGenKernel.setArg(5, STEP);
    queue.enqueueNDRangeKernel(pointGenKernel, cl::NullRange, global, local);
    const int numElems = NELEMS*NELEMS*NELEMS;
    static const NDRange thrds(64, 1);
    NDRange glob(thrds[0] * divup(numElems, thrds[0]), thrds[1]);
    colorsKernel.setArg(0, colors);
    colorsKernel.setArg(1, NELEMS);
    queue.enqueueNDRangeKernel(colorsKernel, cl::NullRange, glob, thrds);
}
int main(void)
{
    try {
        
                            MINIMUM-1.0f, MAXIMUM,
                            MINIMUM-1.0f, MAXIMUM);
        int numElems = NELEMS*NELEMS*NELEMS;
        
        context = createCLGLContext(wnd);
        Device device = context.getInfo<CL_CONTEXT_DEVICES>()[0];
        queue = CommandQueue(context, device);
        cl::Buffer points(context, CL_MEM_READ_WRITE, sizeof(float)*3*numElems);
        cl::Buffer colors(context, CL_MEM_READ_WRITE, sizeof(float)*3*numElems);
        cl::Buffer dirs(context, CL_MEM_READ_WRITE, sizeof(float)*3*numElems);
        generatePoints(points, dirs, colors, queue, device);
        do {
        releaseGLBuffer(handles[0]);
        releaseGLBuffer(handles[1]);
        releaseGLBuffer(handles[2]);
        std::cout << err.
what() << 
"(" << err.
err() << 
")" << std::endl;
    } catch (cl::Error err) {
        std::cout << err.what() << "(" << err.err() << ")" << std::endl;
    }
    return 0;
}