//
// File:       fft_execute.cpp
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#include "fft_internal.h"
#include "clFFT.h"
#include <stdlib.h>
#include <stdio.h>
#include <math.h>

#define max(a,b) (((a)>(b)) ? (a) : (b))
#define min(a,b) (((a)<(b)) ? (a) : (b))

static cl_int
allocateTemporaryBufferInterleaved(cl_fft_plan *plan, cl_uint batchSize)
{
	cl_int err = CL_SUCCESS;
	if(plan->temp_buffer_needed && plan->last_batch_size != batchSize) 
	{
		plan->last_batch_size = batchSize; 
		size_t tmpLength = plan->n.x * plan->n.y * plan->n.z * batchSize * 2 * sizeof(cl_float);
		
		if(plan->tempmemobj)
			clReleaseMemObject(plan->tempmemobj);
			
		plan->tempmemobj = clCreateBuffer(plan->context, CL_MEM_READ_WRITE, tmpLength, NULL, &err);
	}
	return err;	
}

static cl_int
allocateTemporaryBufferPlannar(cl_fft_plan *plan, cl_uint batchSize)
{
	cl_int err = CL_SUCCESS;
	cl_int terr;
	if(plan->temp_buffer_needed && plan->last_batch_size != batchSize) 
	{
		plan->last_batch_size = batchSize; 
		size_t tmpLength = plan->n.x * plan->n.y * plan->n.z * batchSize * sizeof(cl_float);
		
		if(plan->tempmemobj_real)
			clReleaseMemObject(plan->tempmemobj_real);

		if(plan->tempmemobj_imag)
			clReleaseMemObject(plan->tempmemobj_imag);			
			
		plan->tempmemobj_real = clCreateBuffer(plan->context, CL_MEM_READ_WRITE, tmpLength, NULL, &err);
		plan->tempmemobj_imag = clCreateBuffer(plan->context, CL_MEM_READ_WRITE, tmpLength, NULL, &terr);
		err |= terr;
 	}	
	return err;
}

void
getKernelWorkDimensions(cl_fft_plan *plan, cl_fft_kernel_info *kernelInfo, cl_int *batchSize, size_t *gWorkItems, size_t *lWorkItems)
{
	*lWorkItems = kernelInfo->num_workitems_per_workgroup;
	int numWorkGroups = kernelInfo->num_workgroups;
    int numXFormsPerWG = kernelInfo->num_xforms_per_workgroup;
	
	switch(kernelInfo->dir)
	{
		case cl_fft_kernel_x:
            *batchSize *= (plan->n.y * plan->n.z);
            numWorkGroups = (*batchSize % numXFormsPerWG) ? (*batchSize/numXFormsPerWG + 1) : (*batchSize/numXFormsPerWG);
            numWorkGroups *= kernelInfo->num_workgroups;
			break;
		case cl_fft_kernel_y:
			*batchSize *= plan->n.z;
			numWorkGroups *= *batchSize;
			break;
		case cl_fft_kernel_z:
			numWorkGroups *= *batchSize;
			break;
	}
	
	*gWorkItems = numWorkGroups * *lWorkItems;
}

cl_int 
clFFT_ExecuteInterleaved( cl_command_queue queue, clFFT_Plan Plan, cl_int batchSize, clFFT_Direction dir, 
						 cl_mem data_in, cl_mem data_out, 
						 cl_int num_events, cl_event *event_list, cl_event *event )
{	
	int s;
	cl_fft_plan *plan = (cl_fft_plan *) Plan;
	if(plan->format != clFFT_InterleavedComplexFormat)
		return CL_INVALID_VALUE;
	
	cl_int err;
	size_t gWorkItems, lWorkItems;
	int inPlaceDone;
	
	cl_int isInPlace = data_in == data_out ? 1 : 0;
	
	if((err = allocateTemporaryBufferInterleaved(plan, batchSize)) != CL_SUCCESS)
		return err;	
	
	cl_mem memObj[3];
	memObj[0] = data_in;
	memObj[1] = data_out;
	memObj[2] = plan->tempmemobj;
	cl_fft_kernel_info *kernelInfo = plan->kernel_info;
	int numKernels = plan->num_kernels;
	
	int numKernelsOdd = numKernels & 1;
	int currRead  = 0;
	int currWrite = 1;
	
	// at least one external dram shuffle (transpose) required
	if(plan->temp_buffer_needed) 
	{
		// in-place transform
		if(isInPlace) 
		{
			inPlaceDone = 0;
			currRead  = 1;
			currWrite = 2;
		}
		else
		{
			currWrite = (numKernels & 1) ? 1 : 2;
		}
		
		while(kernelInfo) 
		{
			if( isInPlace && numKernelsOdd && !inPlaceDone && kernelInfo->in_place_possible) 
			{
				currWrite = currRead;
				inPlaceDone = 1;
			}
			
			s = batchSize;
			getKernelWorkDimensions(plan, kernelInfo, &s, &gWorkItems, &lWorkItems);
			err |= clSetKernelArg(kernelInfo->kernel, 0, sizeof(cl_mem), &memObj[currRead]);
			err |= clSetKernelArg(kernelInfo->kernel, 1, sizeof(cl_mem), &memObj[currWrite]);
			err |= clSetKernelArg(kernelInfo->kernel, 2, sizeof(cl_int), &dir);
			err |= clSetKernelArg(kernelInfo->kernel, 3, sizeof(cl_int), &s);
			
			err |= clEnqueueNDRangeKernel(queue,  kernelInfo->kernel, 1, NULL, &gWorkItems, &lWorkItems, 0, NULL, NULL);
			if(err)
				return err;
			
			currRead  = (currWrite == 1) ? 1 : 2;
			currWrite = (currWrite == 1) ? 2 : 1; 
			
			kernelInfo = kernelInfo->next;
		}			
	}
	// no dram shuffle (transpose required) transform
	// all kernels can execute in-place.
	else {
		
		while(kernelInfo)
		{
		    s = batchSize;
		    getKernelWorkDimensions(plan, kernelInfo, &s, &gWorkItems, &lWorkItems);
		    err |= clSetKernelArg(kernelInfo->kernel, 0, sizeof(cl_mem), &memObj[currRead]);
		    err |= clSetKernelArg(kernelInfo->kernel, 1, sizeof(cl_mem), &memObj[currWrite]);
		    err |= clSetKernelArg(kernelInfo->kernel, 2, sizeof(cl_int), &dir);
		    err |= clSetKernelArg(kernelInfo->kernel, 3, sizeof(cl_int), &s);
		
		    err |= clEnqueueNDRangeKernel(queue,  kernelInfo->kernel, 1, NULL, &gWorkItems, &lWorkItems, 0, NULL, NULL);
		    if(err)
			    return err;		
			
			currRead  = 1;
			currWrite = 1;
			
			kernelInfo = kernelInfo->next;
		}
	}
	
	return err;
}

cl_int 
clFFT_ExecutePlannar( cl_command_queue queue, clFFT_Plan Plan, cl_int batchSize, clFFT_Direction dir, 
					  cl_mem data_in_real, cl_mem data_in_imag, cl_mem data_out_real, cl_mem data_out_imag,
					  cl_int num_events, cl_event *event_list, cl_event *event)
{	
	int s;
	cl_fft_plan *plan = (cl_fft_plan *) Plan;
	
	if(plan->format != clFFT_SplitComplexFormat)
		return CL_INVALID_VALUE;
	
	cl_int err;
	size_t gWorkItems, lWorkItems;
	int inPlaceDone;
	
	cl_int isInPlace = ((data_in_real == data_out_real) && (data_in_imag == data_out_imag)) ? 1 : 0;
	
	if((err = allocateTemporaryBufferPlannar(plan, batchSize)) != CL_SUCCESS)
		return err;	
	
	cl_mem memObj_real[3];
	cl_mem memObj_imag[3];
	memObj_real[0] = data_in_real;
	memObj_real[1] = data_out_real;
	memObj_real[2] = plan->tempmemobj_real;
	memObj_imag[0] = data_in_imag;
	memObj_imag[1] = data_out_imag;
	memObj_imag[2] = plan->tempmemobj_imag;
		
	cl_fft_kernel_info *kernelInfo = plan->kernel_info;
	int numKernels = plan->num_kernels;
	
	int numKernelsOdd = numKernels & 1;
	int currRead  = 0;
	int currWrite = 1;
	
	// at least one external dram shuffle (transpose) required
	if(plan->temp_buffer_needed) 
	{
		// in-place transform
		if(isInPlace) 
		{
			inPlaceDone = 0;
			currRead  = 1;
			currWrite = 2;
		}
		else
		{
			currWrite = (numKernels & 1) ? 1 : 2;
		}
		
		while(kernelInfo) 
		{
			if( isInPlace && numKernelsOdd && !inPlaceDone && kernelInfo->in_place_possible) 
			{
				currWrite = currRead;
				inPlaceDone = 1;
			}
			
			s = batchSize;
			getKernelWorkDimensions(plan, kernelInfo, &s, &gWorkItems, &lWorkItems);
			err |= clSetKernelArg(kernelInfo->kernel, 0, sizeof(cl_mem), &memObj_real[currRead]);
			err |= clSetKernelArg(kernelInfo->kernel, 1, sizeof(cl_mem), &memObj_imag[currRead]);
			err |= clSetKernelArg(kernelInfo->kernel, 2, sizeof(cl_mem), &memObj_real[currWrite]);
			err |= clSetKernelArg(kernelInfo->kernel, 3, sizeof(cl_mem), &memObj_imag[currWrite]);
			err |= clSetKernelArg(kernelInfo->kernel, 4, sizeof(cl_int), &dir);
			err |= clSetKernelArg(kernelInfo->kernel, 5, sizeof(cl_int), &s);
			
			err |= clEnqueueNDRangeKernel(queue,  kernelInfo->kernel, 1, NULL, &gWorkItems, &lWorkItems, 0, NULL, NULL);
			if(err)
				return err;			
			
			currRead  = (currWrite == 1) ? 1 : 2;
			currWrite = (currWrite == 1) ? 2 : 1; 
			
			kernelInfo = kernelInfo->next;
		}			
	}
	// no dram shuffle (transpose required) transform
	else {
		
		while(kernelInfo)
		{
		    s = batchSize;
		    getKernelWorkDimensions(plan, kernelInfo, &s, &gWorkItems, &lWorkItems);
		    err |= clSetKernelArg(kernelInfo->kernel, 0, sizeof(cl_mem), &memObj_real[currRead]);
		    err |= clSetKernelArg(kernelInfo->kernel, 1, sizeof(cl_mem), &memObj_imag[currRead]);
		    err |= clSetKernelArg(kernelInfo->kernel, 2, sizeof(cl_mem), &memObj_real[currWrite]);
		    err |= clSetKernelArg(kernelInfo->kernel, 3, sizeof(cl_mem), &memObj_imag[currWrite]);
		    err |= clSetKernelArg(kernelInfo->kernel, 4, sizeof(cl_int), &dir);
		    err |= clSetKernelArg(kernelInfo->kernel, 5, sizeof(cl_int), &s);
		
		    err |= clEnqueueNDRangeKernel(queue,  kernelInfo->kernel, 1, NULL, &gWorkItems, &lWorkItems, 0, NULL, NULL);
		    if(err)
			    return err;	
			
			currRead  = 1;
			currWrite = 1;
		
			kernelInfo = kernelInfo->next;
		}
	}
	
	return err;
}

cl_int 
clFFT_1DTwistInterleaved(clFFT_Plan Plan, cl_command_queue queue, cl_mem array, 
						 unsigned numRows, unsigned numCols, unsigned startRow, unsigned rowsToProcess, clFFT_Direction dir)
{
	cl_fft_plan *plan = (cl_fft_plan *) Plan;
	
	unsigned int N = numRows*numCols;
	unsigned int nCols = numCols;
	unsigned int sRow = startRow;
	unsigned int rToProcess = rowsToProcess;
	int d = dir;
	int err = 0;
	
	cl_device_id device_id;
	err = clGetCommandQueueInfo(queue, CL_QUEUE_DEVICE, sizeof(cl_device_id), &device_id, NULL);
	if(err)
	    return err;
	
	size_t gSize;
	err = clGetKernelWorkGroupInfo(plan->twist_kernel, device_id, CL_KERNEL_WORK_GROUP_SIZE, sizeof(size_t), &gSize, NULL);
	if(err)
	    return err;
	      
	gSize = min(128, gSize);
	size_t numGlobalThreads[1] = { max(numCols / gSize, 1)*gSize };
	size_t numLocalThreads[1]  = { gSize };
	
	err |= clSetKernelArg(plan->twist_kernel, 0, sizeof(cl_mem), &array);
	err |= clSetKernelArg(plan->twist_kernel, 1, sizeof(unsigned int), &sRow);
	err |= clSetKernelArg(plan->twist_kernel, 2, sizeof(unsigned int), &nCols);
	err |= clSetKernelArg(plan->twist_kernel, 3, sizeof(unsigned int), &N);
	err |= clSetKernelArg(plan->twist_kernel, 4, sizeof(unsigned int), &rToProcess);
	err |= clSetKernelArg(plan->twist_kernel, 5, sizeof(int), &d);
	
	err |= clEnqueueNDRangeKernel(queue, plan->twist_kernel, 1, NULL, numGlobalThreads, numLocalThreads, 0, NULL, NULL);            
	
	return err;	
}

cl_int 
clFFT_1DTwistPlannar(clFFT_Plan Plan, cl_command_queue queue, cl_mem array_real, cl_mem array_imag, 
					 unsigned numRows, unsigned numCols, unsigned startRow, unsigned rowsToProcess, clFFT_Direction dir)
{
	cl_fft_plan *plan = (cl_fft_plan *) Plan;
	
	unsigned int N = numRows*numCols;
	unsigned int nCols = numCols;
	unsigned int sRow = startRow;
	unsigned int rToProcess = rowsToProcess;
	int d = dir;
	int err = 0;
	
	cl_device_id device_id;
	err = clGetCommandQueueInfo(queue, CL_QUEUE_DEVICE, sizeof(cl_device_id), &device_id, NULL);
	if(err)
	    return err;
	
	size_t gSize;
	err = clGetKernelWorkGroupInfo(plan->twist_kernel, device_id, CL_KERNEL_WORK_GROUP_SIZE, sizeof(size_t), &gSize, NULL);
	if(err)
	    return err;
	      
	gSize = min(128, gSize);
	size_t numGlobalThreads[1] = { max(numCols / gSize, 1)*gSize };
	size_t numLocalThreads[1]  = { gSize };
	
	err |= clSetKernelArg(plan->twist_kernel, 0, sizeof(cl_mem), &array_real);
	err |= clSetKernelArg(plan->twist_kernel, 1, sizeof(cl_mem), &array_imag);
	err |= clSetKernelArg(plan->twist_kernel, 2, sizeof(unsigned int), &sRow);
	err |= clSetKernelArg(plan->twist_kernel, 3, sizeof(unsigned int), &nCols);
	err |= clSetKernelArg(plan->twist_kernel, 4, sizeof(unsigned int), &N);
	err |= clSetKernelArg(plan->twist_kernel, 5, sizeof(unsigned int), &rToProcess);
	err |= clSetKernelArg(plan->twist_kernel, 6, sizeof(int), &d);
	
	err |= clEnqueueNDRangeKernel(queue, plan->twist_kernel, 1, NULL, numGlobalThreads, numLocalThreads, 0, NULL, NULL);            
	
	return err;	
}