class OpenclTemplateHelper

# File lib/tensor_stream/opencl/opencl_template_helper.rb, line 3
def initialize(source)
  @source = source
end

# File lib/tensor_stream/opencl/opencl_template_helper.rb, line 31
def dtype_to_c_type(dtype)
  case dtype.to_s
  when 'float64'
    'double'
  when 'float32', 'float', 'float16'
    'float'
  when 'uint32'
    'uint'
  when 'int64'
    'int' # 'long' - NArray does not support 64bit int types
  when 'uint64'
    'uint'  # 'ulong' - NArray does not support 64bit int types
  when 'int32', 'int'
    'int'
  when 'uint16'
    'ushort'
  when 'int16'
    'short'
  when 'uint8'
    'uchar'
  when 'boolean'
    'uchar'
  else
    raise "unknown dtype #{dtype}"
  end
end

# File lib/tensor_stream/opencl/opencl_template_helper.rb, line 17
def floating_point?(dtype)
  TensorStream::Ops::FLOATING_POINT_TYPES.include?(dtype)
end

# File lib/tensor_stream/opencl/opencl_template_helper.rb, line 7
def generate(args = {})
  current_scope = binding

  args.each do |k, v|
    current_scope.local_variable_set(k.to_sym, v)
  end

  ERB.new(@source, nil, '%').result(current_scope)
end

# File lib/tensor_stream/opencl/opencl_template_helper.rb, line 79
def max_value_for(dtype)
  case dtype.to_s
  when 'float64'
    'DBL_MAX'
  when 'float32', 'float', 'float16'
    'FLT_MAX'
  when 'int32', 'int'
    'INT_MAX'
  when 'uint32', 'uint16'
    '0'
  when 'int16'
    'SHRT_MAX'
  when 'int8'
    '256'
  when 'boolean'
    '1'
  else
    raise "unknown dtype #{dtype}"
  end
end

# File lib/tensor_stream/opencl/opencl_template_helper.rb, line 58
def min_value_for(dtype)
  case dtype.to_s
  when 'float64'
    'DBL_MIN'
  when 'float32', 'float', 'float16'
    'FLT_MIN'
  when 'int32', 'int'
    'INT_MIN'
  when 'uint32', 'uint16'
    '0'
  when 'int16'
    'SHRT_MIN'
  when 'int8'
    '0'
  when 'boolean'
    '0'
  else
    raise "unknown dtype #{dtype}"
  end
end

# File lib/tensor_stream/opencl/opencl_template_helper.rb, line 100
def operator_to_c(op)
  case op
  when 'less'
    '<'
  when 'less_equal'
    '<='
  when 'equal'
    '=='
  when 'greater'
    '>'
  when 'greater_equal'
    '>='
  when 'not_equal'
    '!='
  when 'logical_and'
    '&&'
  when 'div'
    '/'
  when 'add'
    '+'
  when 'sub'
    '-'
  when 'mul'
    '*'
  when 'mod'
    '%'
  else
    raise "unsupported op #{op}"
  end
end

# File lib/tensor_stream/opencl/opencl_template_helper.rb, line 21
def render(template, locals = {})
  filename = File.join(File.dirname(__FILE__), 'kernels', "_#{template}")
  source = File.read(filename)
  current_scope = binding
  locals.each do |k, v|
    current_scope.local_variable_set(k.to_sym, v)
  end
  ERB.new(source, nil, '%').result(current_scope)
end