# -*- coding: utf-8 -*-

#-------------------------------------------------------------------------
# drawElements Quality Program utilities
# --------------------------------------
#
# Copyright 2015 The Android Open Source Project
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
#-------------------------------------------------------------------------

import sys
import random
import operator
import itertools

from genutil import *

random.seed(1234567)
indices = xrange(sys.maxint)

# Constructors:
#
# - scalars types
#   * int <-> float <-> bool (also float(float) etc.)
#   * to bool: zero means false, others true
#   * from bool: false==0, true==1
#   * \todo [petri] float<->int rounding rules?
# - scalar type from vector
#   * choose the first component
# - vectors & matrices
#   * vector from scalar: broadcast to all components
#   * matrix from scalar: broadcast scalar to diagonal, other components zero
#   * vector from vector: copy existing components
#     + illegal: vector from smaller vector
#   * mat from mat: copy existing components, other components from identity matrix
#   * from components: consumed by-component in column-major order, must have same
#     number of components,
#     + note: vec4(mat2) valid
#     \todo [petri] Implement!
# - notes:
#   * type conversions are always allowed: mat3(ivec3, bvec3, bool, int, float) is valid!
#
# Accessors:
#
# - vector components
#   * .xyzw, .rgba, .stpq
#   * illegal to mix
#   * now allowed for scalar types
#   * legal to chain: vec4.rgba.xyzw.stpq
#   * illegal to select more than 4 components
#   * array indexing with [] operator
#   * can also write!
# - matrix columns
#   * [] accessor
#   * note: mat4[0].x = 1.0; vs mat4[0][0] = 1.0; ??
#   * out-of-bounds accesses
#
# \todo [petri] Accessors!
#
# Spec issues:
#
# - constructing larger vector from smaller: vec3(vec2) ?
# - base type and size conversion at same time: vec4(bool), int(vec3) allowed?

def combineVec(comps):
	res = []
	for ndx in range(len(comps[0])):
#		for x in comps:
#			print x[ndx].toFloat().getScalars() ,
		scalars = reduce(operator.add, [x[ndx].toFloat().getScalars() for x in comps])
#		print "->", scalars
		res.append(Vec.fromScalarList(scalars))
	return res

def combineIVec(comps):
	res = []
	for ndx in range(len(comps[0])):
		res.append(Vec.fromScalarList(reduce(operator.add, [x[ndx].toInt().getScalars() for x in comps])))
	return res

def combineUVec(comps):
	return [x.toUint() for x in combineIVec(comps)]

def combineBVec(comps):
	res = []
	for ndx in range(len(comps[0])):
		res.append(Vec.fromScalarList(reduce(operator.add, [x[ndx].toBool().getScalars() for x in comps])))
	return res

def combineMat(numCols, numRows, comps):
	res = []
	for ndx in range(len(comps[0])):
		scalars = reduce(operator.add, [x[ndx].toFloat().getScalars() for x in comps])
		res.append(Mat(numCols, numRows, scalars))
	return res

def combineMat2(comps):		return combineMat(2, 2, comps)
def combineMat2x3(comps):	return combineMat(2, 3, comps)
def combineMat2x4(comps):	return combineMat(2, 4, comps)
def combineMat3x2(comps):	return combineMat(3, 2, comps)
def combineMat3(comps):		return combineMat(3, 3, comps)
def combineMat3x4(comps):	return combineMat(3, 4, comps)
def combineMat4x2(comps):	return combineMat(4, 2, comps)
def combineMat4x3(comps):	return combineMat(4, 3, comps)
def combineMat4(comps):		return combineMat(4, 4, comps)

# 0 \+ [f*f for f in lst]
# r = 0 \+ [f in lst -> f*f]
# r = 0 \+ lst

# Templates.

s_simpleCaseTemplate = """
case ${{NAME}}
	version 300 es
	values
	{
		${{VALUES}}
	}

	both ""
		#version 300 es
		precision mediump float;
		precision mediump int;

		${DECLARATIONS}

		void main()
		{
			${SETUP}
			${{OP}}
			${OUTPUT}
		}
	""
end
"""[1:]

s_simpleIllegalCaseTemplate = """
case ${{NAME}}
	version 300 es
	expect compile_fail
	values {}

	both ""
		#version 300 es
		precision mediump float;
		precision mediump int;

		${DECLARATIONS}

		void main()
		{
			${SETUP}
			${{OP}}
			${OUTPUT}
		}
	""
end
"""[1:]

class SimpleCase(ShaderCase):
	def __init__(self, name, inputs, outputs, op):
		self.name		= name
		self.inputs		= inputs
		self.outputs	= outputs
		self.op			= op

	def __str__(self):
		params = {
			"NAME":		self.name,
			"VALUES":	genValues(self.inputs, self.outputs),
			"OP":		self.op
		}
		return fillTemplate(s_simpleCaseTemplate, params)

class ConversionCase(ShaderCase):
	def __init__(self, inValues, convFunc):
		outValues = convFunc(inValues)
		inType	= inValues[0].typeString()
		outType	= outValues[0].typeString()
		self.name		= "%s_to_%s" % (inType, outType)
		self.op			= "out0 = %s(in0);" % outType
		self.inputs		= [("%s in0" % inType, inValues)]
		self.outputs	= [("%s out0" % outType, outValues)]

	def __str__(self):
		params = {
			"NAME":		self.name,
			"VALUES":	genValues(self.inputs, self.outputs),
			"OP":		self.op
		}
		return fillTemplate(s_simpleCaseTemplate, params)

class IllegalConversionCase(ShaderCase):
	def __init__(self, inValue, outValue):
		inType	= inValue.typeString()
		outType	= outValue.typeString()
		self.name		= "%s_to_%s" % (inType, outType)
		self.op			= "%s in0 = %s;\n%s out0 = %s(in0);" % (inType, str(inValue), outType, outType)
		self.inType		= inType
		self.outType	= outType

	def __str__(self):
		params = {
			"NAME":		self.name,
			"OP":		self.op
		}
		return fillTemplate(s_simpleIllegalCaseTemplate, params)

class CombineCase(ShaderCase):
	def __init__(self, inComps, combFunc):
		self.inComps	= inComps
		self.outValues	= combFunc(inComps)
		self.outType	= self.outValues[0].typeString()
		inTypes = [values[0].typeString() for values in inComps]
		self.name		= "%s_to_%s" % ("_".join(inTypes), self.outType)
		self.inputs		= [("%s in%s" % (comp[0].typeString(), ndx), comp) for (comp, ndx) in zip(inComps, indices)]
		self.outputs	= [("%s out0" % self.outType, self.outValues)]
		self.op			= "out0 = %s(%s);" % (self.outType, ", ".join(["in%d" % x for x in range(len(inComps))]))

	def __str__(self):
		params = {
			"NAME":		self.name,
			"VALUES":	genValues(self.inputs, self.outputs),
			"OP":		self.op
		}
		return fillTemplate(s_simpleCaseTemplate, params)

# CASE DECLARATIONS

def toPos (value):
	if isinstance(value, list):
		return [toPos(x) for x in value]
	else:
		return GenMath.abs(value)

inFloat	= [Scalar(x) for x in [0.0, 1.0, 2.0, 3.5, -0.5, -8.25, -20.125, 36.8125]]
inInt	= [Scalar(x) for x in [0, 1, 2, 5, 8, 11, -12, -66, -192, 255]]
inUint	= [Uint(x) for x in [0, 2, 3, 8, 9, 12, 10, 45, 193, 255]]
inBool	= [Scalar(x) for x in [True, False]]

inVec4	= [Vec4(0.0, 0.5, 0.75, 0.825), Vec4(1.0, 1.25, 1.125, 1.75),
		   Vec4(-0.5, -2.25, -4.875, 9.0), Vec4(-32.0, 64.0, -51.0, 24.0),
		   Vec4(-0.75, -1.0/31.0, 1.0/19.0, 1.0/4.0)]
inVec3	= toVec3(inVec4)
inVec2	= toVec2(inVec4)
inIVec4	= toIVec4(inVec4)
inIVec3	= toIVec3(inVec4)
inIVec2	= toIVec2(inVec4)
inBVec4	= [Vec4(True, False, False, True), Vec4(False, False, False, True), Vec4(False, True, False, False), Vec4(True, True, True, True), Vec4(False, False, False, False)]
inBVec3	= toBVec3(inBVec4)
inBVec2	= toBVec2(inBVec4)
inUVec4	= toUVec4(toPos(inVec4))
inUVec3 = toUVec3(toPos(inVec3))
inUVec2 = toUVec2(toPos(inVec2))

# \todo [petri] Enable large values when epsilon adapts to the values.
inMat4	= [Mat4(1.0, 0.0, 0.0, 0.0,  0.0, 1.0, 0.0, 0.0,  0.0, 0.0, 1.0, 0.0,  0.0, 0.0, 0.0, 1.0),
		   Mat4(6.5, 12.5, -0.75, 9.975,  32.0, 1.0/48.0, -8.425, -6.542,  1.0/8.0, 1.0/16.0, 1.0/32.0, 1.0/64.0,  -6.725, -0.5, -0.0125, 9.975),
		   #Mat4(128.0, 256.0, -512.0, -1024.0,  2048.0, -4096.0, 8192.0, -8192.0,  192.0, -384.0, 768.0, -1536.0,  8192.0, -8192.0, 6144.0, -6144.0)
		   ]
inMat2	= [Mat2(1.0, 0.0,  0.0, 1.0),
		   Mat2(6.5, 12.5,  -0.75, 9.975),
		   Mat2(6.5, 12.5,  -0.75, 9.975),
		   Mat2(8.0, 16.0,  -24.0, -16.0),
		   Mat2(1.0/8.0, 1.0/16.0,  1.0/32.0, 1.0/64.0),
		   Mat2(-18.725, -0.5,  -0.0125, 19.975),
		   #Mat2(128.0, -4096.0,  192.0, -1536.0),
		   #Mat2(-1536.0, 8192.0,  6144.0, -6144.0)
		   ]

inMat4x3	= toMat4x3(inMat4)
inMat4x2	= toMat4x2(inMat4)
inMat3x4	= toMat3x4(inMat4)
inMat3		= toMat3(inMat4)
inMat3x2	= toMat3x2(inMat4)
inMat2x4	= toMat2x4(inMat4)
inMat2x3	= toMat2x3(inMat4)

def genConversionCases(inValueList, convFuncList):
	combinations = list(itertools.product(inValueList, convFuncList))
	return [ConversionCase(inValues, convFunc) for (inValues, convFunc) in combinations]

def genIllegalConversionCases(inValueList, outValueList):
	inValues	= [x[0] for x in inValueList]
	outValues	= [x[0] for x in outValueList]
	combinations = list(itertools.product(inValues, outValues))
	return [IllegalConversionCase(inVal, outVal) for (inVal, outVal) in combinations]

def shuffleSubLists(outer):
	return [shuffled(inner) for inner in outer]

# Generate all combinations of CombineCases.
# inTupleList	a list of tuples of value-lists
# combFuncList	a list of comb* functions to combine
def genComponentCases(inCompLists, combFuncList):
	res = []
	for comps in inCompLists:
		maxLen = reduce(max, [len(values) for values in comps])
		comps = [repeatToLength(values, maxLen) for values in comps]
		comps = [shuffled(values) for values in comps]
		for combFunc in combFuncList:
			res += [CombineCase(comps, combFunc)]
	return res

allConversionCases = []

# Scalar-to-scalar conversions.
allConversionCases.append(CaseGroup("scalar_to_scalar", "Scalar to Scalar Conversions",
	genConversionCases([inFloat, inInt, inUint, inBool], [toFloat, toInt, toBool]) +\
	genConversionCases([toPos(inFloat), toPos(inInt), inUint, inBool], [toUint])))

# Scalar-to-vector conversions.
allConversionCases.append(CaseGroup("scalar_to_vector", "Scalar to Vector Conversions",
	genConversionCases([inFloat, inInt, inUint, inBool], [toVec2, toVec3, toVec4, toIVec2, toIVec3, toIVec4, toBVec2, toBVec3, toBVec4]) +\
	genConversionCases([toPos(inFloat), toPos(inInt), inUint, inBool], [toUVec2, toUVec3, toUVec4])))

# Vector-to-scalar conversions.
allConversionCases.append(CaseGroup("vector_to_scalar", "Vector to Scalar Conversions",
	genConversionCases([inVec2, inVec3, inVec4, inIVec2, inIVec3, inIVec4, inUVec2, inUVec3, inUVec4, inBVec2, inBVec3, inBVec4], [toFloat, toInt, toBool]) +\
	genConversionCases([toPos(inVec2), toPos(inVec3), toPos(inVec4), toPos(inIVec2), toPos(inIVec3), toPos(inIVec4), inUVec2, inUVec3, inUVec4, inBVec2, inBVec3, inBVec4], [toUint])))

# Illegal vector-to-vector conversions (to longer vec).
allConversionCases.append(CaseGroup("vector_illegal", "Illegal Vector Conversions",
	genIllegalConversionCases([inVec2, inIVec2, inUVec2, inBVec2], [inVec3, inIVec3, inUVec3, inBVec3, inVec4, inIVec4, inUVec4, inBVec4]) +\
	genIllegalConversionCases([inVec3, inIVec3, inUVec3, inBVec3], [inVec4, inIVec4, inUVec4, inBVec4])))

# Vector-to-vector conversions (type conversions, downcasts).
allConversionCases.append(CaseGroup("vector_to_vector", "Vector to Vector Conversions",
	genConversionCases([inVec4, inIVec4, inUVec4, inBVec4], [toVec4, toVec3, toVec2, toIVec4, toIVec3, toIVec2, toBVec4, toBVec3, toBVec2]) +\
	genConversionCases([toPos(inVec4), toPos(inIVec4), inUVec4, inBVec4], [toUVec4, toUVec3, toUVec2]) +\
	genConversionCases([inVec3, inIVec3, inUVec3, inBVec3], [toVec3, toVec2, toIVec3, toIVec2, toBVec3, toBVec2]) +\
	genConversionCases([toPos(inVec3), toPos(inIVec3), inUVec3, inBVec3], [toUVec3, toUVec2]) +\
	genConversionCases([inVec2, inIVec2, inUVec2, inBVec2], [toVec2, toIVec2, toBVec2]) +\
	genConversionCases([toPos(inVec2), toPos(inIVec2), inUVec2, inBVec2], [toUVec2])))

# Scalar-to-matrix.
allConversionCases.append(CaseGroup("scalar_to_matrix", "Scalar to Matrix Conversions",
	genConversionCases([inFloat, inInt, inUint, inBool], [toMat4, toMat4x3, toMat4x2, toMat3x4, toMat3, toMat3x2, toMat2x4, toMat2x3, toMat2])))

# Vector-to-matrix.
#allConversionCases += genConversionCases([inVec4, inIVec4, inBVec4], [toMat4])
#allConversionCases += genConversionCases([inVec3, inIVec3, inBVec3], [toMat3])
#allConversionCases += genConversionCases([inVec2, inIVec2, inBVec2], [toMat2])

# Matrix-to-matrix.
allConversionCases.append(CaseGroup("matrix_to_matrix", "Matrix to Matrix Conversions",
	genConversionCases([inMat4, inMat4x3, inMat4x2, inMat3x4, inMat3, inMat3x2, inMat2x4, inMat2x3, inMat2], [toMat4, toMat4x3, toMat4x2, toMat3x4, toMat3, toMat3x2, toMat2x4, toMat2x3, toMat2])))

# Vector-from-components, matrix-from-components.
in2Comp		= [[inFloat, inFloat], [inInt, inInt], [inUint, inUint], [inBool, inBool], [inFloat, inInt], [inFloat, inBool], [inInt, inBool], [inInt, inUint], [inUint, inFloat]]
in3Comp		= [[inFloat, inFloat, inFloat], [inInt, inInt, inInt], [inUint, inUint, inUint], [inBool, inBool, inBool], [inBool, inFloat, inInt], [inVec2, inBool], [inBVec2, inFloat], [inBVec2, inInt], [inBool, inIVec2], [inFloat, inUVec2]]
in4Comp		= [[inVec2, inVec2], [inBVec2, inBVec2], [inFloat, inFloat, inFloat, inFloat], [inInt, inInt, inInt, inInt], [inUint, inUint, inUint, inUint], [inBool, inBool, inBool, inBool], [inBool, inFloat, inInt, inBool], [inVec2, inIVec2], [inVec2, inBVec2], [inBVec3, inFloat], [inVec3, inFloat], [inInt, inIVec2, inInt], [inBool, inFloat, inIVec2], [inFloat, inUVec3], [inInt, inUVec2, inBool]]
in6Comp		= [[inVec3, inVec3], [inBVec3, inBVec3], [inFloat, inFloat, inFloat, inFloat, inFloat, inFloat], [inInt, inInt, inInt, inInt, inInt, inInt], [inBool, inBool, inBool, inBool, inBool, inBool], [inBool, inFloat, inInt, inBool, inFloat, inInt], [inVec3, inIVec3], [inVec2, inBVec4], [inBVec3, inFloat, inIVec2], [inVec3, inFloat, inBVec2]]
in8Comp		= [[inVec3, inVec3, inVec2], [inIVec3, inIVec3, inIVec2], [inVec2, inIVec2, inFloat, inFloat, inInt, inBool], [inBool, inFloat, inInt, inVec2, inBool, inBVec2], [inBool, inBVec2, inInt, inVec4], [inFloat, inBVec4, inIVec2, inBool]]
in9Comp		= [[inVec3, inVec3, inVec3], [inIVec3, inIVec3, inIVec3], [inVec2, inIVec2, inFloat, inFloat, inInt, inBool, inBool], [inBool, inFloat, inInt, inVec2, inBool, inBVec2, inFloat], [inBool, inBVec2, inInt, inVec4, inBool], [inFloat, inBVec4, inIVec2, inBool, inBool]]
in12Comp	= [[inVec4, inVec4, inVec4], [inIVec4, inIVec4, inIVec4], [inVec2, inIVec2, inFloat, inFloat, inFloat, inInt, inInt, inBool, inBool, inBool], [inBool, inFloat, inInt, inVec3, inBool, inBVec3, inFloat, inBool], [inBool, inBVec4, inInt, inVec4, inBool, inFloat], [inFloat, inBVec4, inIVec4, inBool, inBool, inInt]]
in16Comp	= [[inVec4, inVec4, inVec4, inVec4], [inIVec4, inIVec4, inIVec4, inIVec4], [inBVec4, inBVec4, inBVec4, inBVec4], [inFloat, inIVec3, inBVec3, inVec4, inIVec2, inFloat, inVec2]]

allConversionCases.append(CaseGroup("vector_combine", "Vector Combine Constructors",
	genComponentCases(in4Comp, [combineVec, combineIVec, combineBVec]) +\
	genComponentCases(toPos(in4Comp), [combineUVec]) +\
	genComponentCases(in3Comp, [combineVec, combineIVec, combineBVec]) +\
	genComponentCases(toPos(in3Comp), [combineUVec]) +\
	genComponentCases(in2Comp, [combineVec, combineIVec, combineBVec]) +\
	genComponentCases(toPos(in2Comp), [combineUVec])))

allConversionCases.append(CaseGroup("matrix_combine", "Matrix Combine Constructors",
	genComponentCases(in4Comp,	[combineMat2])		+\
	genComponentCases(in6Comp,	[combineMat2x3])	+\
	genComponentCases(in8Comp,	[combineMat2x4])	+\
	genComponentCases(in6Comp,	[combineMat3x2])	+\
	genComponentCases(in9Comp,	[combineMat3])		+\
	genComponentCases(in12Comp,	[combineMat3x4])	+\
	genComponentCases(in8Comp,	[combineMat4x2])	+\
	genComponentCases(in12Comp,	[combineMat4x3])	+\
	genComponentCases(in16Comp, [combineMat4])
	))

# Main program.

if __name__ == "__main__":
	print("Generating shader case files.")
	writeAllCases("conversions.test", allConversionCases)