xref: /aosp_15_r20/external/deqp/modules/gles31/scripts/gen-implicit-conversions.py (revision 35238bce31c2a825756842865a792f8cf7f89930)

# -*- 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 itertools
import operator

import genutil

from genutil import Scalar, Vec2, Vec3, Vec4, Uint, UVec2, UVec3, UVec4, CaseGroup


# Templates

ARTIHMETIC_CASE_TEMPLATE = """
case ${{NAME}}
    version 310 es
    require extension { "GL_EXT_shader_implicit_conversions" } in { vertex, fragment }
    values
    {
        ${{VALUES}}
    }

    both ""
        #version 310 es
        precision highp float;
        ${DECLARATIONS}

        void main()
        {
            ${SETUP}
            out0 = ${{EXPR}};
            ${OUTPUT}
        }
    ""
end
""".strip()

FUNCTIONS_CASE_TEMPLATE = """
case ${{NAME}}
    version 310 es
    require extension { "GL_EXT_shader_implicit_conversions" } in { vertex, fragment }
    values
    {
        ${{VALUES}}
    }

    both ""
        #version 310 es
        precision highp float;
        ${DECLARATIONS}

        ${{OUTTYPE}} func (${{OUTTYPE}} a)
        {
            return a * ${{OUTTYPE}}(2);
        }

        void main()
        {
            ${SETUP}
            out0 = func(in0);
            ${OUTPUT}
        }
    ""
end
""".strip()

ARRAY_CASE_TEMPLATE = """
case ${{NAME}}
    version 310 es
    require extension { "GL_EXT_shader_implicit_conversions" } in { vertex, fragment }
    values
    {
        ${{VALUES}}
    }

    both ""
        #version 310 es
        precision highp float;
        ${DECLARATIONS}

        void main()
        {
            ${SETUP}
            ${{ARRAYTYPE}}[] x = ${{ARRAYTYPE}}[] (${{ARRAYVALUES}});
            out0 = ${{EXPR}};
            ${OUTPUT}
        }
    ""
end
""".strip()

STRUCT_CASE_TEMPLATE = """
case ${{NAME}}
    version 310 es
    require extension { "GL_EXT_shader_implicit_conversions" } in { vertex, fragment }
    values
    {
        ${{VALUES}}
    }

    both ""
        #version 310 es
        precision highp float;
        ${DECLARATIONS}

        void main()
        {
            ${SETUP}
            struct {
                ${{OUTTYPE}} val;
            } x;

            x.val = ${{STRUCTVALUE}};

            out0 = ${{EXPR}};
            ${OUTPUT}
        }
    ""
end
""".strip()

INVALID_CASE_TEMPLATE = """
case ${{NAME}}
    expect compile_fail
    version 310 es
    require extension { "GL_EXT_shader_implicit_conversions" } in { vertex, fragment }
    values
    {
        ${{VALUES}}
    }

    both ""
        #version 310 es
        precision highp float;
        ${DECLARATIONS}

        void main()
        {
            ${SETUP}
            out0 = in0 + ${{OPERAND}};
            ${OUTPUT}
        }
    ""
end
""".strip()

INVALID_ARRAY_CASE_TEMPLATE = """
case ${{NAME}}
    expect compile_fail
    version 310 es
    require extension { "GL_EXT_shader_implicit_conversions" } in { vertex, fragment }
    values {}

    both ""
        #version 310 es
        precision highp float;
        ${DECLARATIONS}

        void main()
        {
            ${SETUP}
            ${{EXPR}}
            ${OUTPUT}
        }
    ""
end
""".strip()

INVALID_STRUCT_CASE_TEMPLATE = """
case ${{NAME}}
    expect compile_fail
    version 310 es
    require extension { "GL_EXT_shader_implicit_conversions" } in { vertex, fragment }
    values {}

    both ""
        #version 310 es
        precision highp float;
        ${DECLARATIONS}

        void main()
        {
            ${SETUP}
            struct { ${{INTYPE}} value; } a;
            struct { ${{OUTTYPE}} value; } b;
            a = ${{INVALUE}};
            b = a;
            ${OUTPUT}
        }
    ""
end
""".strip()


# Input values

IN_ISCALAR = [  2,  1,  1,  3,  5 ]
IN_USCALAR = [  1,  3,  4,  7, 11 ]

IN_IVECTOR = [
    ( 1,  2,  3,  4),
    ( 2,  1,  2,  6),
    ( 3,  7,  2,  5),
]

IN_UVECTOR = [
    ( 2,  3,  5,  8),
    ( 4,  6,  2,  9),
    ( 1, 13,  7,  4),
]

IN_VALUES = {
    "int": [Scalar(x)                                for x in IN_ISCALAR],
    "uint": [Scalar(x)                                for x in IN_USCALAR],
    "ivec2": [Vec2(x[0], x[1])                        for x in IN_IVECTOR],
    "uvec2": [Vec2(x[0], x[1])                        for x in IN_UVECTOR],
    "ivec3": [Vec3(x[0], x[1], x[2])                    for x in IN_IVECTOR],
    "uvec3": [Vec3(x[0], x[1], x[2])                    for x in IN_UVECTOR],
    "ivec4": [Vec4(x[0], x[1], x[2], x[3])            for x in IN_IVECTOR],
    "uvec4": [Vec4(x[0], x[1], x[2], x[3])            for x in IN_UVECTOR],
    "float": [Scalar(x).toFloat()                    for x in IN_ISCALAR],
    "vec2": [Vec2(x[0], x[1]).toFloat()                for x in IN_IVECTOR],
    "vec3": [Vec3(x[0], x[1], x[2]).toFloat()        for x in IN_IVECTOR],
    "vec4": [Vec4(x[0], x[1], x[2], x[3]).toFloat()    for x in IN_IVECTOR],
}

VALID_CONVERSIONS = {
    "int": ["float", "uint"],
    "uint": ["float"],
    "ivec2": ["uvec2", "vec2"],
    "uvec2": ["vec2"],
    "ivec3": ["uvec3", "vec3"],
    "uvec3": ["vec3"],
    "ivec4": ["uvec4", "vec4"],
    "uvec4": ["vec4"]
}

SCALAR_TO_VECTOR_CONVERSIONS = {
    "int": ["vec2", "vec3", "vec4", "uvec2", "uvec3", "uvec4"],
    "uint": ["vec2", "vec3", "vec4"]
}

VALID_ASSIGNMENTS = {
    "int": ["ivec2", "ivec3", "ivec4"],
    "uint": ["uvec2", "uvec3", "uvec4"],
    "ivec2": ["int", "float"],
    "ivec3": ["int", "float"],
    "ivec4": ["int", "float"],
    "uvec2": ["uint", "float"],
    "uvec3": ["uint", "float"],
    "uvec4": ["uint", "float"],
    "float": ["vec2", "vec3", "vec4"],
    "vec2": ["float"],
    "vec3": ["float"],
    "vec4": ["float"]
}

IN_TYPE_ORDER = [
    "int",  "uint",
    "ivec2", "uvec2", "ivec3",
    "uvec3", "ivec4", "uvec4",

    "float",
    "vec2",  "vec3",  "vec4"
]

def isScalarTypeName (name):
    return name in ["float", "int", "uint"]

def isVec2TypeName (name):
    return name in ["vec2", "ivec2", "uvec2"]

def isVec3TypeName (name):
    return name in ["vec3", "ivec3", "uvec3"]

def isVec4TypeName (name):
    return name in ["vec4", "ivec4", "uvec4"]

# Utilities

def scalarToVector(a, b):
    if isinstance(a, Scalar) and isinstance(b, Vec2):
        a = a.toVec2()
    elif isinstance(a, Scalar) and isinstance(b, Vec3):
        a = a.toVec3()
    elif isinstance(a, Scalar) and isinstance(b, Vec4):
        a = a.toVec4()
    return a

def isUintTypeName (type_name):
    return type_name in ["uint", "uvec2", "uvec3", "uvec4"]

def convLiteral (type, value):
    if isUintTypeName(type):
        return int(value)
    else:
        return value

def valueToStr(value_type, value):
    if isinstance(value, Scalar):
        return str(value)
    else:
        assert isinstance(value, genutil.Vec)
        out = value_type + "("
        out += ", ".join([str(convLiteral(value_type, x)) for x in value.getScalars()])
        out += ")"
        return out


def valuesToStr(prefix, value_type, values):
    def gen_value_strs(value_list, value_type):
        for value in value_list:
            yield valueToStr(value_type, value)
    return "%s = [ %s ];" % (prefix, " | ".join(gen_value_strs(values, value_type)))


# Test cases

class ArithmeticCase(genutil.ShaderCase):
    def __init__(self, name, op, in_type, out_type, reverse=False):
        self.op_func = {
            "+": operator.add,
            "-": operator.sub,
            "*": operator.mul,
            "/": operator.div,
        }
        self.name = name
        self.op = op
        self.in_type = in_type
        self.out_type = out_type
        self.reverse = reverse

    def __str__(self):
        params = {
            "NAME": self.name,
            "EXPR": self.get_expr(),
            "VALUES": self.gen_values(),
        }
        return genutil.fillTemplate(ARTIHMETIC_CASE_TEMPLATE, params)

    def apply(self, a, b):
        assert(self.op in self.op_func)
        a = scalarToVector(a, b)

        if self.reverse:
            b, a = a, b

        return self.op_func[self.op](a, b)

    def get_expr(self):
        expr = ["in0", self.op, str(self.get_operand())]

        if self.reverse:
            expr.reverse()

        return " ".join(expr)

    def get_operand(self):
        operands = {
            "float": Scalar(2.0),
            "vec2": Vec2(1.0, 2.0),
            "vec3": Vec3(1.0, 2.0, 3.0),
            "vec4": Vec4(1.0, 2.0, 3.0, 4.0),
            "uint": Uint(2),
            "uvec2": UVec2(1, 2),
            "uvec3": UVec3(1, 2, 3),
            "uvec4": UVec4(1, 2, 3, 4),
        }
        assert self.out_type in operands
        return operands[self.out_type]

    def gen_values(self):
        in_values = IN_VALUES[self.in_type]

        y = self.get_operand()
        out_values = [self.apply(x, y) for x in in_values]

        out = []
        out.append(valuesToStr("input %s in0" % (self.in_type), self.in_type, in_values))
        out.append(valuesToStr("output %s out0" % (self.out_type), self.out_type, out_values))

        return "\n".join(out)


class ComparisonsCase(ArithmeticCase):
    def __init__(self, name, op, in_type, out_type, reverse=False):
        super(ComparisonsCase, self).__init__(name, op, in_type, out_type, reverse)

        self.op_func = {
            "==": operator.eq,
            "!=": operator.ne,
            "<": operator.lt,
            ">": operator.gt,
            "<=": operator.le,
            ">=": operator.ge,
        }

    def apply(self, a, b):
        assert(self.op in self.op_func)

        if isinstance(a, Scalar) and isinstance(b, Scalar):
            a, b = float(a), float(b)

        if self.reverse:
            b, a = a, b

        return Scalar(self.op_func[self.op](a, b))

    def gen_values(self):
        in_values = IN_VALUES[self.in_type]

        y = self.get_operand()
        out_values = [self.apply(x, y) for x in in_values]

        out = []
        out.append(valuesToStr("input %s in0" % (self.in_type), self.in_type, in_values))
        out.append(valuesToStr("output bool out0", "bool", out_values))

        return "\n".join(out)


class ParenthesizedCase(genutil.ShaderCase):
    def __init__(self, name, in_type, out_type, reverse=False, input_in_parens=False):
        self.name = name
        self.in_type = in_type
        self.out_type = out_type
        self.reverse = reverse
        self.input_in_parens = input_in_parens

    def __str__(self):
        params = {
            "NAME": self.name,
            "EXPR": self.get_expr(),
            "VALUES": self.gen_values(),
        }
        return genutil.fillTemplate(ARTIHMETIC_CASE_TEMPLATE, params)

    def apply(self, a):
        b, c = self.get_operand(0), self.get_operand(1)
        a = scalarToVector(a, b)

        if self.input_in_parens:
            return b*(a+c)
        else:
            return a*(b+c)

    def get_expr(self):
        def make_paren_expr():
            out = [
                "in0" if self.input_in_parens else self.get_operand(0),
                "+",
                self.get_operand(1)
            ]
            return "(%s)" % (" ".join([str(x) for x in out]))

        expr = [
            "in0" if not self.input_in_parens else self.get_operand(0),
            "*",
            make_paren_expr()
        ]

        if self.reverse:
            expr.reverse()

        return " ".join([str(x) for x in expr])

    def get_operand(self, ndx=0):
        return IN_VALUES[self.out_type][ndx]

    def gen_values(self):
        in_values = IN_VALUES[self.in_type]

        out_values = [self.apply(x) for x in in_values]

        out = []
        out.append(valuesToStr("input %s in0" % (self.in_type), self.in_type, in_values))
        out.append(valuesToStr("output %s out0" % (self.out_type), self.out_type, out_values))

        return "\n".join(out)


class FunctionsCase(genutil.ShaderCase):
    def __init__(self, name, in_type, out_type):
        self.name = name
        self.in_type = in_type
        self.out_type = out_type

    def __str__(self):
        params = {
            "NAME": self.name,
            "OUTTYPE": self.out_type,
            "VALUES": self.gen_values(),
        }
        return genutil.fillTemplate(FUNCTIONS_CASE_TEMPLATE, params)

    def apply(self, a):
        if isUintTypeName(self.out_type):
            return a.toUint() * Uint(2)
        else:
            return a.toFloat() * Scalar(2.0)

    def gen_values(self):
        in_values = IN_VALUES[self.in_type]
        out_values = [self.apply(x) for x in in_values]

        out = []
        out.append(valuesToStr("input %s in0" % (self.in_type), self.in_type, in_values))
        out.append(valuesToStr("output %s out0" % (self.out_type), self.out_type, out_values))

        return "\n".join(out)


class ArrayCase(genutil.ShaderCase):
    def __init__(self, name, in_type, out_type, reverse=False):
        self.name = name
        self.in_type = in_type
        self.out_type = out_type
        self.reverse = reverse

    def __str__(self):
        params = {
            "NAME": self.name,
            "VALUES": self.gen_values(),
            "ARRAYTYPE": self.out_type,
            "ARRAYVALUES": self.gen_array_values(),
            "EXPR": self.get_expr(),
        }
        return genutil.fillTemplate(ARRAY_CASE_TEMPLATE, params)

    def apply(self, a):
        b = IN_VALUES[self.out_type][1]
        a = scalarToVector(a, b)

        return a + b

    def get_expr(self):
        if not self.reverse:
            return "in0 + x[1]"
        else:
            return "x[1] + in0"

    def gen_values(self):
        in_values = IN_VALUES[self.in_type]
        out_values = [self.apply(x) for x in in_values]

        out = []
        out.append(valuesToStr("input %s in0" % (self.in_type), self.in_type, in_values))
        out.append(valuesToStr("output %s out0" % (self.out_type), self.out_type, out_values))

        return "\n".join(out)

    def gen_array_values(self):
        out = [valueToStr(self.out_type, x) for x in IN_VALUES[self.out_type]]
        return ", ".join(out)


class ArrayUnpackCase(genutil.ShaderCase):
    def __init__(self, name, in_type, out_type):
        self.name = name
        self.in_type = in_type
        self.out_type = out_type

    def __str__(self):
        params = {
            "NAME": self.name,
            "VALUES": self.gen_values(),
            "ARRAYTYPE": "float",
            "ARRAYVALUES": self.gen_array_values(),
            "EXPR": self.get_expr(),
        }
        return genutil.fillTemplate(ARRAY_CASE_TEMPLATE, params)

    def apply(self, a):
        if isinstance(a, Scalar) and isVec2TypeName(self.out_type):
            a = a.toVec2()
        elif isinstance(a, Scalar) and isVec3TypeName(self.out_type):
            a = a.toVec3()
        elif isinstance(a, Scalar) and isVec4TypeName(self.out_type):
            a = a.toVec4()

        b = IN_VALUES["float"]

        out = [Scalar(x)+y for x, y in zip(a.getScalars(), b)]

        if self.out_type == "float":
            return out[0].toFloat()
        elif self.out_type == "uint":
            return out[0].toUint()
        elif self.out_type == "vec2":
            return Vec2(out[0], out[1]).toFloat()
        elif self.out_type == "uvec2":
            return Vec2(out[0], out[1]).toUint()
        elif self.out_type == "vec3":
            return Vec3(out[0], out[1], out[2]).toFloat()
        elif self.out_type == "uvec3":
            return Vec3(out[0], out[1], out[2]).toUint()
        elif self.out_type == "vec4":
            return Vec4(out[0], out[1], out[2], out[3]).toFloat()
        elif self.out_type == "uvec4":
            return Vec4(out[0], out[1], out[2], out[3]).toUint()

    def get_expr(self):
        def num_scalars(typename):
            return IN_VALUES[typename][0].getNumScalars()

        def gen_sums():
            in_scalars = num_scalars(self.in_type)
            out_scalars = num_scalars(self.out_type)

            for ndx in range(out_scalars):
                if in_scalars > 1:
                    yield "in0[%i] + x[%i]" % (ndx, ndx)
                else:
                    yield "in0 + x[%i]" % (ndx)

        return "%s(%s)" % (self.out_type, ", ".join(gen_sums()))

    def gen_values(self):
        in_values = IN_VALUES[self.in_type]
        out_values = [self.apply(x) for x in in_values]

        out = []
        out.append(valuesToStr("input %s in0" % (self.in_type), self.in_type, in_values))
        out.append(valuesToStr("output %s out0" % (self.out_type), self.out_type, out_values))

        return "\n".join(out)

    def gen_array_values(self):
        out = [valueToStr(self.out_type, x) for x in IN_VALUES["float"]]
        return ", ".join(out)


class StructCase(genutil.ShaderCase):
    def __init__(self, name, in_type, out_type, reverse=False):
        self.name = name
        self.in_type = in_type
        self.out_type = out_type
        self.reverse = reverse

    def __str__(self):
        params = {
            "NAME": self.name,
            "VALUES": self.gen_values(),
            "OUTTYPE": self.out_type,
            "STRUCTVALUE": self.get_struct_value(),
            "EXPR": self.get_expr(),
        }
        return genutil.fillTemplate(STRUCT_CASE_TEMPLATE, params)

    def apply(self, a):
        if isinstance(a, Scalar) and isVec2TypeName(self.out_type):
            a = a.toVec2()
        elif isinstance(a, Scalar) and isVec3TypeName(self.out_type):
            a = a.toVec3()
        elif isinstance(a, Scalar) and isVec4TypeName(self.out_type):
            a = a.toVec4()

        b = IN_VALUES[self.out_type][0]

        return a + b

    def get_expr(self):
        if not self.reverse:
            return "in0 + x.val"
        else:
            return "x.val + in0"

    def gen_values(self):
        in_values = IN_VALUES[self.in_type]
        out_values = [self.apply(x) for x in in_values]

        out = []
        out.append(valuesToStr("input %s in0" % (self.in_type), self.in_type, in_values))
        out.append(valuesToStr("output %s out0" % (self.out_type), self.out_type, out_values))

        return "\n".join(out)

    def get_struct_value(self):
        return valueToStr(self.out_type, IN_VALUES[self.out_type][0])


class InvalidCase(genutil.ShaderCase):
    def __init__(self, name, in_type, out_type):
        self.name = name
        self.in_type = in_type
        self.out_type = out_type

    def __str__(self):
        params = {
            "NAME": self.name,
            "OPERAND": str(self.get_operand()),
            "VALUES": self.gen_values(),
        }
        return genutil.fillTemplate(INVALID_CASE_TEMPLATE, params)

    def apply(self, a, b):
        return b

    def get_operand(self):
        return IN_VALUES[self.out_type][0]

    def gen_values(self):
        in_values = IN_VALUES[self.in_type]

        y = self.get_operand()
        out_values = [self.apply(x, y) for x in in_values]

        out = []
        out.append(valuesToStr("input %s in0" % (self.in_type), self.in_type, in_values))
        out.append(valuesToStr("output %s out0" % (self.out_type), self.out_type, out_values))

        return "\n".join(out)


class InvalidArrayCase(genutil.ShaderCase):
    def __init__(self, name, in_type, out_type):
        self.name = name
        self.in_type = in_type
        self.out_type = out_type

    def __str__(self):
        params = {
            "NAME": self.name,
            "EXPR": self.gen_expr(),
        }
        return genutil.fillTemplate(INVALID_ARRAY_CASE_TEMPLATE, params)

    def gen_expr(self):
        in_values = [valueToStr(self.out_type, x) for x in IN_VALUES[self.in_type]]

        out = "%s a[] = %s[] (%s);" % (self.out_type, self.in_type, ", ".join(in_values))

        return out


class InvalidStructCase(genutil.ShaderCase):
    def __init__(self, name, in_type, out_type):
        self.name = name
        self.in_type = in_type
        self.out_type = out_type

    def __str__(self):
        params = {
            "NAME": self.name,
            "INTYPE": self.in_type,
            "OUTTYPE": self.out_type,
            "INVALUE": self.get_value(),
        }
        return genutil.fillTemplate(INVALID_STRUCT_CASE_TEMPLATE, params)

    def get_value(self):
        return valueToStr(self.in_type, IN_VALUES[self.in_type][0])


# Case file generation

def genConversionPairs(order=IN_TYPE_ORDER, scalar_to_vector=True, additional={}):
    def gen_order(conversions):
        key_set = set(conversions.iterkeys())
        for typename in order:
            if typename in key_set:
                yield typename
    conversions = {}

    for in_type in VALID_CONVERSIONS:
        conversions[in_type] = [] + VALID_CONVERSIONS[in_type]
        if in_type in SCALAR_TO_VECTOR_CONVERSIONS and scalar_to_vector:
            conversions[in_type] += SCALAR_TO_VECTOR_CONVERSIONS[in_type]

    for key in additional.iterkeys():
            value = conversions.get(key, [])
            conversions[key] = value + additional[key]

    for in_type in gen_order(conversions):
        for out_type in conversions[in_type]:
            yield (in_type, out_type)


def genInvalidConversions():
    types = IN_TYPE_ORDER
    valid_pairs = set(genConversionPairs(additional=VALID_ASSIGNMENTS))

    for pair in itertools.permutations(types, 2):
        if pair not in valid_pairs:
            yield pair


def genArithmeticCases(reverse=False):
    op_names = [
        ("add", "Addition", "+"),
        ("sub", "Subtraction", "-"),
        ("mul", "Multiplication", "*"),
        ("div", "Division", "/")
    ]

    for name, desc, op in op_names:
        casegroup = CaseGroup(name, desc, [])
        for in_type, out_type in genConversionPairs():
            if op == "-" and isUintTypeName(out_type):
                continue # Can't handle at the moment
            name = in_type + "_to_" + out_type
            casegroup.children.append(ArithmeticCase(name, op, in_type, out_type, reverse))
        yield casegroup


def genComparisonCases(reverse=False):
    op_names = [
        ("equal", "Equal", "=="),
        ("not_equal", "Not equal", "!="),
        ("less", "Less than", "<"),
        ("greater", "Greater than", ">"),
        ("less_or_equal", "Less than or equal", "<="),
        ("greater_or_equal", "Greater than or equal", ">="),
    ]

    for name, desc, op in op_names:
        casegroup = CaseGroup(name, desc, [])
        type_order = IN_TYPE_ORDER if name in ["equal", "not_equal"] else ["int", "uint"]

        for in_type, out_type in genConversionPairs(order=type_order, scalar_to_vector=False):
            name = in_type + "_to_" + out_type
            casegroup.children.append(ComparisonsCase(name, op, in_type, out_type, reverse))
        yield casegroup


def genParenthesizedCases():
    for reverse in [True, False]:
        if reverse:
            name = "paren_expr_before_literal"
            desc = "Parenthesized expression before literal"
        else:
            name = "literal_before_paren_expr"
            desc = "Literal before parenthesized expression"
        reversegroup = CaseGroup(name, desc, [])

        for input_in_parens in [True, False]:
            if input_in_parens:
                name = "input_in_parens"
                desc = "Input variable in parenthesized expression"
            else:
                name = "input_outside_parens"
                desc = "Input variable outside parenthesized expression"
            casegroup = CaseGroup(name, desc, [])

            for in_type, out_type in genConversionPairs():
                name = in_type + "_to_" + out_type
                casegroup.children.append(
                    ParenthesizedCase(name, in_type, out_type, reverse, input_in_parens)
                )
            reversegroup.children.append(casegroup)
        yield reversegroup


def genArrayCases(reverse=False):
    for in_type, out_type in genConversionPairs():
        name = in_type + "_to_" + out_type
        yield ArrayCase(name, in_type, out_type, reverse)


def genArrayUnpackCases(reverse=False):
    for in_type, out_type in genConversionPairs():
        name = in_type + "_to_" + out_type
        yield ArrayUnpackCase(name, in_type, out_type)


def genFunctionsCases():
    for in_type, out_type in genConversionPairs(scalar_to_vector=False):
        name = in_type + "_to_" + out_type
        yield FunctionsCase(name, in_type, out_type)


def genStructCases(reverse=False):
    for in_type, out_type in genConversionPairs():
        name = in_type + "_to_" + out_type
        yield StructCase(name, in_type, out_type, reverse)


def genInvalidCases(reverse=False):
    for in_type, out_type in genInvalidConversions():
        name = in_type + "_to_" + out_type
        yield InvalidCase(name, in_type, out_type)


def genInvalidArrayCases():
    for in_type, out_type in genConversionPairs(scalar_to_vector=False):
        name = in_type + "_to_" + out_type
        yield InvalidArrayCase(name, in_type, out_type)


def genInvalidStructCases():
    for in_type, out_type in genConversionPairs(scalar_to_vector=False):
        name = in_type + "_to_" + out_type
        yield InvalidStructCase(name, in_type, out_type)


def genAllCases():
    yield CaseGroup(
        "arithmetic", "Arithmetic operations",
        [
            CaseGroup("input_before_literal", "Input before literal",
                      genArithmeticCases(reverse=False)),
            CaseGroup("literal_before_input", "Literal before input",
                      genArithmeticCases(reverse=True)),
        ]
    )

    yield CaseGroup(
        "comparisons", "Comparisons",
        [
            CaseGroup("input_before_literal", "Input before literal",
                      genComparisonCases(reverse=False)),
            CaseGroup("literal_before_input", "Literal before input",
                      genComparisonCases(reverse=True)),
        ]
    )

    yield CaseGroup(
        "array_subscripts", "Array subscripts",
        [
            CaseGroup("input_before_subscript", "Input before subscript",
                      genArrayCases(reverse=False)),
            CaseGroup("subscript_before_input", "Subscript before input",
                      genArrayCases(reverse=True)),
        #    CaseGroup("unpack", "Unpack array and repack as value",
        #              genArrayUnpackCases()),
        ]
    )

    yield CaseGroup("functions", "Function calls",
                    genFunctionsCases())

    yield CaseGroup("struct_fields", "Struct field selectors",
        [
            CaseGroup("input_before_field", "Input before field",
                      genStructCases(reverse=False)),
            CaseGroup("field_before_input", "Field before input",
                      genStructCases(reverse=True)),
        ]
    )

    yield CaseGroup("parenthesized_expressions", "Parenthesized expressions",
                    genParenthesizedCases())

    yield CaseGroup(
        "invalid", "Invalid conversions",
        [
            CaseGroup("variables", "Single variables",
                      genInvalidCases()),
            CaseGroup("arrays", "Arrays",
                      genInvalidArrayCases()),
            CaseGroup("structs", "Structs",
                      genInvalidStructCases()),
        ]
    )


if __name__ == "__main__":
    print("Generating shader case files.")
    genutil.writeAllCases("implicit_conversions.test", genAllCases())