gl-struct 0.0.1

use std::slice::*;
use std::mem::*;

///
///A macro constucting the gl functions for managing uniforms using the
///concat_idents! macro. Note that this can only be used in expressions,
///and as such, you must both import the function name into the current module
///AND borrow the function as a pointer in order to use.
///
///Also, while this only does glUniform* stuff, in the future I may expand it if
///it would be of use.
///
macro_rules! gl_builder {

    //some control flow patterns. Probably would be better practice to redesign to not need these
    //but it is what it is for now
    ([true] $then:tt $else:tt @if $($tail:tt)*) => { gl_builder!{$then $($tail)*} };
    ([false] $then:tt $else:tt @if $($tail:tt)*) => { gl_builder!{$else $($tail)*} };

    ([true] @not $($tail:tt)*) => { gl_builder!{[false] $($tail)*} };
    ([false] @not $($tail:tt)*) => { gl_builder!{[true] $($tail)*} };

    ([1]      [1] @eq $($tail:tt)*) => { gl_builder!{[true] $($tail)*} };
    ([2]      [2] @eq $($tail:tt)*) => { gl_builder!{[true] $($tail)*} };
    ([3]      [3] @eq $($tail:tt)*) => { gl_builder!{[true] $($tail)*} };
    ([4]      [4] @eq $($tail:tt)*) => { gl_builder!{[true] $($tail)*} };
    ([1]      [$b:literal] @eq $($tail:tt)*) => { gl_builder!{[false] $($tail)*} };
    ([2]      [$b:literal] @eq $($tail:tt)*) => { gl_builder!{[false] $($tail)*} };
    ([3]      [$b:literal] @eq $($tail:tt)*) => { gl_builder!{[false] $($tail)*} };
    ([4]      [$b:literal] @eq $($tail:tt)*) => { gl_builder!{[false] $($tail)*} };
    // ([$a:lit] [$b:lit] @eq $($tail:tt)*) => { gl_builder!{[false] $($tail)*} };

    ([$($code:tt)*] @quote) => { $($code)* };
    ({$($code:tt)*} @eval $($tail:tt)*) => { gl_builder!{$($code)* $($tail)*} };


    ({$($gl:ident)*} c_bool @ty_suffix $($tail:tt)*) => { gl_builder!{{$($gl)* ui} $($tail)*} };
    ({$($gl:ident)*} GLuint @ty_suffix $($tail:tt)*) => { gl_builder!{{$($gl)* ui} $($tail)*} };
    ({$($gl:ident)*} GLint @ty_suffix $($tail:tt)*) => { gl_builder!{{$($gl)* i} $($tail)*} };
    ({$($gl:ident)*} GLfloat @ty_suffix $($tail:tt)*) => { gl_builder!{{$($gl)* f} $($tail)*} };
    ({$($gl:ident)*} GLdouble @ty_suffix $($tail:tt)*) => { gl_builder!{{$($gl)* d} $($tail)*} };

    ({$($gl:ident)*} 1 @uni_vec $($tail:tt)*) => { gl_builder!{{$($gl)* Uniform1} $($tail)*} };
    ({$($gl:ident)*} 2 @uni_vec $($tail:tt)*) => { gl_builder!{{$($gl)* Uniform2} $($tail)*} };
    ({$($gl:ident)*} 3 @uni_vec $($tail:tt)*) => { gl_builder!{{$($gl)* Uniform3} $($tail)*} };
    ({$($gl:ident)*} 4 @uni_vec $($tail:tt)*) => { gl_builder!{{$($gl)* Uniform4} $($tail)*} };

    ({$($gl:ident)*} 2 @uni_mat $($tail:tt)*) => { gl_builder!{{$($gl)* UniformMatrix2} $($tail)*} };
    ({$($gl:ident)*} 3 @uni_mat $($tail:tt)*) => { gl_builder!{{$($gl)* UniformMatrix3} $($tail)*} };
    ({$($gl:ident)*} 4 @uni_mat $($tail:tt)*) => { gl_builder!{{$($gl)* UniformMatrix4} $($tail)*} };

    ({$($gl:ident)*} 2 @mat_xN $($tail:tt)*) => { gl_builder!{{$($gl)* x2} $($tail)*} };
    ({$($gl:ident)*} 3 @mat_xN $($tail:tt)*) => { gl_builder!{{$($gl)* x3} $($tail)*} };
    ({$($gl:ident)*} 4 @mat_xN $($tail:tt)*) => { gl_builder!{{$($gl)* x4} $($tail)*} };

    ({$($gl:ident)*} @v $($tail:tt)*) => { gl_builder!{{$($gl)* v} $($tail)*} };

    ({$($gl:ident)*} @concat) => { concat_idents!{$($gl),*} };

    (@get $prim:ident) => { gl_builder!{{GetUniform} $prim @ty_suffix @v @concat} };
    (@get [$prim:ident; $c:tt]) => { gl_builder!{@get $prim} };
    (@get [[$prim:ident; $c1:tt]; $c2:tt]) => { gl_builder!{@get $prim} };

    (@set $prim:ident) => { gl_builder!{@set [$prim; 1]} };
    (@set [$prim:ident; $c:tt]) => { gl_builder!{{} $c @uni_vec $prim @ty_suffix @v @concat} };
    (@set [[$prim:ident; $c1:tt]; $c2:tt]) => {
        gl_builder! (
            [$c1] [$c2] @eq
            { {} $c2 @uni_mat }
            { {} $c2 @uni_mat $c1 @mat_xN }
            @if @eval
            $prim @ty_suffix @v @concat
        )
    };



}

macro_rules! glsl_type {

    //
    //In order to make all the primitives and the like fit the std430 layout
    //(and allow type checking for std140), we need to set the alignment of each type accordingly
    //

    //all scalars besides double (which has 8) require an alignment of 4bytes, fitstd140,
    //but they cannot satisfy sdt140 if they are in an array
    (GLdouble @align $($tail:tt)*) => { glsl_type!({8} false true true $($tail)*); };
    ($prim:ident @align $($tail:tt)*) => { glsl_type!({4} false true true $($tail)*); };

    //for vectors, the alignment is 2N for vec2 and 4N for vec3 and vec4, and hence,
    //all BUT vec2/ivec2/uvec2/bvec2 can be put into std140 arrays
    ({4} false true true 2 @align_vec $($tail:tt)*) => { glsl_type!({8} false $($tail)*); };
    ({8} false true true 2 @align_vec $($tail:tt)*) => { glsl_type!({16} true $($tail)*); }; //dvec2's have an alignent equal to that of vec4
    ({4} false true true 3 @align_vec $($tail:tt)*) => { glsl_type!({16} true $($tail)*); };
    ({8} false true true 3 @align_vec $($tail:tt)*) => { glsl_type!({32} true $($tail)*); };
    ({4} false true true 4 @align_vec $($tail:tt)*) => { glsl_type!({16} true $($tail)*); };
    ({8} false true true 4 @align_vec $($tail:tt)*) => { glsl_type!({32} true $($tail)*); };

    //all vecs are std140 complient
    ([$prim:ident; $c:tt] @align $($tail:tt)*) => { glsl_type!($prim @align $c @align_vec true true $($tail)*); };

    //matrices are considered as arrays over their columns, so all matNx2 and matNx4 are std430 and all matNx4 are 140,
    //However, since we're storing matNx3's as [[T; 3]; N], the columns are not vec4 aligned, so they aren't std430 OR std140
    ([[GLfloat; 2]; $c2:tt] @align $($tail:tt)*) => { glsl_type!({8} false false true $($tail)*); };
    ([[$prim:ident; 3]; $c2:tt] @align $($tail:tt)*) => { glsl_type!({8} false false false $($tail)*); };
    ([[$prim:ident; $c1:tt]; $c2:tt] @align $($tail:tt)*) => { glsl_type!($prim @align $c1 @align_vec true true $($tail)*); };

    //determine if the type is a scalar or matrix or neither
    ({$a:expr} $b1:tt $b2:tt $b3:tt $prim:ident @type $($tail:tt)*) => { glsl_type!({$a} $b1 $b2 $b3 true false $($tail)*); };
    ({$a:expr} $b1:tt $b2:tt $b3:tt [$prim:ident; $c:tt] @type $($tail:tt)*) => { glsl_type!({$a} $b1 $b2 $b3 false false $($tail)*); };
    ({$a:expr} $b1:tt $b2:tt $b3:tt [[$prim:ident; $c1:tt]; $c2:tt] @type $($tail:tt)*) => { glsl_type!({$a} $b1 $b2 $b3 false true $($tail)*); };

    //the initial macro call
    ({$fmt:ty} $name:ident = $($ty:tt)*) => {
        glsl_type!($($ty)* @align $($ty)* @type {$fmt} {$($ty)*} {gl_builder!(@set $($ty)*)} {gl_builder!(@get $($ty)*)} $name);
        glsl_type!(@index $name = $($ty)*);
    };

    (@index $name:ident = $prim:ident) => {};
    (@index $name:ident = [$T:ty; $c:tt]) => {
        impl Index<usize> for $name {
            type Output = $T;
            #[inline] fn index(&self, i: usize) -> &$T { &self.value[i] }
        }

        impl IndexMut<usize> for $name {
            #[inline] fn index_mut(&mut self, i: usize) -> &mut $T { &mut self.value[i] }
        }
    };

    ({$a:expr} $align_vec4:tt $std140:tt $std430:tt $scalar:tt $mat:tt {$fmt:ty} {$prim:ty} {$set:expr} {$get:expr} $name:ident) => {

        gl_builder! {
            [$scalar] @not [
                #[repr(C)]
                #[repr(align($a))]
                #[derive(Clone, Copy, PartialEq, Debug, Default)]
                #[allow(non_camel_case_types)]
                pub struct $name {
                    pub value: $prim
                }

                impl From<$prim> for $name { #[inline] fn from(v: $prim) -> Self { $name{value: v} } }
                impl From<$name> for $prim { #[inline] fn from(v: $name) -> Self { v.value } }

                impl<G:GLSLType> AttributeData<G> for $name where $prim: AttributeData<G> {
                    #[inline] fn format() -> G::AttributeFormat { <$prim as AttributeData<G>>::format() }
                }
            ]
            [ #[allow(non_camel_case_types)] pub type $name = $prim; ]
            @if @quote
        }

        unsafe impl GLSLType for $name {
            type AttributeFormat = $fmt;

            unsafe fn load_uniforms(id: GLint, data: &[Self]){
                let f = &$set;
                gl_builder!{
                    [$mat]
                    [f(id, data.len() as GLint, false as GLboolean, transmute(&data[0][0][0]));]
                    [f(id, data.len() as GLint, transmute(&data[0]));]
                    @if @quote
                }
            }

            unsafe fn get_uniform(p: GLuint, id:GLint) -> Self {
                let mut data = MaybeUninit::<Self>::uninit();
                let f = &$get;
                f(p, id, data.as_mut_ptr() as *mut _);
                data.assume_init()
            }
        }

        gl_builder!{
            [$std430] [unsafe impl Layout<std430> for $name {}] [] @if @quote
        }

        gl_builder!{
            [$std140] [unsafe impl Layout<std140> for $name {}] [] @if @quote
        }

        gl_builder!{
            [$align_vec4] [unsafe impl AlignedVec4 for $name {}] [] @if @quote
        }


    };

}

//we want to throw everything in a module since these are kindof really common data type names
//and we're kinda not 100% following rust naming convention, so we don't want literally everything
//to get pulled into the crate module by default

pub use gl::types::*;
use gl::*;
use super::*;

use std::mem::transmute;
use std::ops::*;

#[repr(align(4))]
#[allow(non_camel_case_types)]
#[derive(Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Debug, Hash, Default)]
pub struct c_bool(GLuint);

macro_rules! impl_c_bool {
    ($($Trait:ident.$fun:ident $op:tt),*) => {$(
        impl $Trait<Self> for c_bool { type Output = Self; #[inline] fn $fun(self, r:Self) -> Self {c_bool(self.0 $op r.0)} }
        impl $Trait<bool> for c_bool { type Output = Self; #[inline] fn $fun(self, r:bool) -> Self {c_bool(self.0 $op r as u32)} }
        impl $Trait<c_bool> for bool { type Output = c_bool; #[inline] fn $fun(self, r:c_bool) -> c_bool {c_bool(self as u32 $op r.0)} }
    )*}
}

macro_rules! impl_c_bool_assign {
    ($($Trait:ident.$fun:ident $op:tt),*) => {$(
        impl $Trait<Self> for c_bool { #[inline] fn $fun(&mut self, r:Self) {self.0 $op r.0;} }
        impl $Trait<bool> for c_bool { #[inline] fn $fun(&mut self, r:bool) {self.0 $op r as u32;} }
        impl $Trait<c_bool> for bool { #[inline] fn $fun(&mut self, r:c_bool) {*self $op r.0>0;} }
    )*}
}

impl_c_bool!(BitAnd.bitand &, BitOr.bitor |, BitXor.bitxor &);
impl_c_bool_assign!(BitAndAssign.bitand_assign &=, BitOrAssign.bitor_assign |=, BitXorAssign.bitxor_assign &=);

impl From<bool> for c_bool { #[inline] fn from(b: bool) -> Self {c_bool(b as GLuint)} }
impl From<c_bool> for bool { #[inline] fn from(b: c_bool) -> Self {b.0>0} }
impl From<GLuint> for c_bool { #[inline] fn from(b: GLuint) -> Self {c_bool(b)} }
impl From<c_bool> for GLuint { #[inline] fn from(b: c_bool) -> Self {b.0} }
impl From<GLboolean> for c_bool { #[inline] fn from(b: GLboolean) -> Self {c_bool(b as GLuint)} }
impl From<c_bool> for GLboolean { #[inline] fn from(b: c_bool) -> Self {b.0 as GLboolean} }

#[allow(non_camel_case_types)]
pub type void = ();

//booleans
glsl_type!({IntFormat} gl_bool = c_bool);
glsl_type!({IVecFormat} bvec2 = [c_bool; 2]);
glsl_type!({IVecFormat} bvec3 = [c_bool; 3]);
glsl_type!({IVecFormat} bvec4 = [c_bool; 4]);

//integers
glsl_type!({IntFormat} int = GLint);
glsl_type!({IVecFormat} ivec2 = [GLint; 2]);
glsl_type!({IVecFormat} ivec3 = [GLint; 3]);
glsl_type!({IVecFormat} ivec4 = [GLint; 4]);

//unsigned integers
glsl_type!({IntFormat} uint = GLuint);
glsl_type!({IVecFormat} uvec2 = [GLuint; 2]);
glsl_type!({IVecFormat} uvec3 = [GLuint; 3]);
glsl_type!({IVecFormat} uvec4 = [GLuint; 4]);

//floats
glsl_type!({FloatFormat} float = GLfloat);
glsl_type!({VecFormat} vec2 = [GLfloat; 2]);
glsl_type!({VecFormat} vec3 = [GLfloat; 3]);
glsl_type!({VecFormat} vec4 = [GLfloat; 4]);
glsl_type!({[VecFormat; 2]} mat2   = [[GLfloat; 2]; 2]);
glsl_type!({[VecFormat; 2]} mat2x3 = [[GLfloat; 3]; 2]);
glsl_type!({[VecFormat; 2]} mat2x4 = [[GLfloat; 4]; 2]);
glsl_type!({[VecFormat; 3]} mat3x2 = [[GLfloat; 2]; 3]);
glsl_type!({[VecFormat; 3]} mat3   = [[GLfloat; 3]; 3]);
glsl_type!({[VecFormat; 3]} mat3x4 = [[GLfloat; 4]; 3]);
glsl_type!({[VecFormat; 4]} mat4x2 = [[GLfloat; 2]; 4]);
glsl_type!({[VecFormat; 4]} mat4x3 = [[GLfloat; 3]; 4]);
glsl_type!({[VecFormat; 4]} mat4   = [[GLfloat; 4]; 4]);

//doubles
glsl_type!({DoubleFormat} double = GLdouble);
glsl_type!({DVecFormat} dvec2 = [GLdouble; 2]);
glsl_type!({DVecFormat} dvec3 = [GLdouble; 3]);
glsl_type!({DVecFormat} dvec4 = [GLdouble; 4]);
glsl_type!({[DVecFormat; 2]} dmat2   = [[GLdouble; 2]; 2]);
glsl_type!({[DVecFormat; 2]} dmat2x3 = [[GLdouble; 3]; 2]);
glsl_type!({[DVecFormat; 2]} dmat2x4 = [[GLdouble; 4]; 2]);
glsl_type!({[DVecFormat; 3]} dmat3x2 = [[GLdouble; 2]; 3]);
glsl_type!({[DVecFormat; 3]} dmat3   = [[GLdouble; 3]; 3]);
glsl_type!({[DVecFormat; 3]} dmat3x4 = [[GLdouble; 4]; 3]);
glsl_type!({[DVecFormat; 4]} dmat4x2 = [[GLdouble; 2]; 4]);
glsl_type!({[DVecFormat; 4]} dmat4x3 = [[GLdouble; 3]; 4]);
glsl_type!({[DVecFormat; 4]} dmat4   = [[GLdouble; 4]; 4]);


macro_rules! impl_array_type {

    ($attrib_support:tt $($num:tt)*) => {
        $(
            unsafe impl<T:GLSLType> GLSLType for [T; $num] {
                gl_builder!{
                    [$attrib_support]
                        [type AttributeFormat = [T::AttributeFormat; $num];]
                        [type AttributeFormat = UnsupportedFormat;]
                    @if @quote
                }

                unsafe fn load_uniforms(id: GLint, data: &[Self]){
                    let flattened = from_raw_parts(&data[0][0] as *const T, data.len() * $num);
                    T::load_uniforms(id, flattened);
                }

                unsafe fn get_uniform(p: GLuint, id:GLint) -> Self {
                    let mut data = MaybeUninit::uninit_array();
                    for i in 0..$num {
                        data[i] = MaybeUninit::new(T::get_uniform(p, id + i as GLint));
                    }
                    MaybeUninit::array_assume_init(data)
                }

                #[inline] fn uniform_locations() -> GLuint { T::uniform_locations() * $num }
                #[inline] fn first_element_name(var: String) -> String { T::first_element_name(var + "[0]") }

            }

            unsafe impl<T:AlignedVec4> AlignedVec4 for [T; $num] {}
            unsafe impl<T:AlignedVec4+Layout<std140>> Layout<std140> for [T; $num] {}
            unsafe impl<T:Layout<std430>> Layout<std430> for [T; $num] {}

        )*
    }


}

impl_array_type!{ true
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}

//As much as it looks like it, this *actually* isn't overkill.
//It is *very* possible that you may need mat4 uniform arrays for something
//such as storing bone transforms for skeletal animation for example.
//Of course, at some point, the user *could* (and should) just use
//arrays of arrays to get more indices (though that needs GL 4)
#[cfg(any(feature = "large_uniform_arrays", feature = "extra_large_uniform_arrays"))]
impl_array_type!{ false
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}

#[cfg(feature = "extra_large_uniform_arrays")]
impl_array_type! { false
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}

unsafe impl<T:Layout<std430>> Layout<std430> for [T] {}
unsafe impl<T:AlignedVec4> Layout<std140> for [T] {}
unsafe impl<T:AlignedVec4> AlignedVec4 for [T] {}

//for uniforms defined with an unnamed struct as a type
macro_rules! impl_tuple_type {
    ($var:ident @first $T0:ident $($T:ident)*) => {$T0::first_element_name($var)};
    ($($T:ident:$t:ident)*) => {

        unsafe impl<$($T:GLSLType),*> GLSLType for ($($T),*) {

            //tuples aren't allowed to be attributes
            type AttributeFormat = UnsupportedFormat;

            unsafe fn load_uniforms(id: GLint, data: &[Self]){
                let mut i = id;
                for ($($t),*) in data {
                    $(
                        $T::load_uniform(i, $t);
                        *(&mut i) = i + $T::uniform_locations() as GLint;
                    )*
                }
            }

            unsafe fn get_uniform(p: GLuint, id:GLint) -> Self {
                let ($(mut $t),*) = ($(MaybeUninit::<$T>::uninit()),*);
                let mut i = id;
                $(
                    $t.write($T::get_uniform(p, i));
                    *(&mut i) = i + $T::uniform_locations() as GLint;
                )*
                ($($t.assume_init()),*)
            }

            #[inline] fn uniform_locations() -> GLuint { 0 $(+ $T::uniform_locations())* }
            #[inline] fn first_element_name(var: String) -> String {impl_tuple_type!(var @first $($T)*)}

        }

    }
}

macro_rules! impl_tuple_layout {

    ({$($T:ident:$t0:ident)*} $Last:ident:$last:ident) => {

        //TODO fix to where a tuple is vec4 aligned if at least one of its members is
        unsafe impl<$($T:Sized+AlignedVec4, )* $Last:?Sized+AlignedVec4> AlignedVec4 for ($($T,)* $Last) {}
        unsafe impl<$($T:Sized+Layout<std140>, )* $Last:?Sized+Layout<std140>> Layout<std140> for ($($T,)* $Last) {}
        unsafe impl<$($T:Sized+Layout<std430>, )* $Last:?Sized+Layout<std430>> Layout<std430> for ($($T,)* $Last) {}

    };
}

impl_tuple!(impl_tuple_type);
impl_tuple!(impl_tuple_layout @with_last);

//
//For specifying which types can be used as data for vertex attributes of the various glsl types
//and what formatting to use
//

macro_rules! impl_attr_data {

    (@Int $prim:ident $value:expr) => {
        impl AttributeData<gl_bool> for $prim { fn format() -> IntFormat { $value }}
        impl AttributeData<int> for $prim { fn format() -> IntFormat { $value }}
        impl AttributeData<uint> for $prim { fn format() -> IntFormat { $value }}
        impl AttributeData<float> for $prim { fn format() -> FloatFormat { FloatFormat::FromInt($value, false) }}
    };

    (@IVec $F:ident $size:tt) => { IVecFormat::IVecN($F::format(), $size) };
    (@Vec $F:ident $size:tt) => { VecFormat::VecN($F::format(), $size) };
    (@DVec $F:ident $size:tt) => { DVecFormat::DVecN($size) };
    (@Mat $F:ident $size:tt) => { [$F::format(); $size] };

    (@$arr:ident $vec1:ident $vec2:ident $vec3:ident $vec4:ident) => {
        impl<F:AttributeData<$vec1>> AttributeData<$vec1> for [F; 1] { fn format() -> <$vec1 as GLSLType>::AttributeFormat { F::format()}}
        impl<F:AttributeData<$vec1>> AttributeData<$vec2> for [F; 2] { fn format() -> <$vec2 as GLSLType>::AttributeFormat { impl_attr_data!(@$arr F 2) } }
        impl<F:AttributeData<$vec1>> AttributeData<$vec3> for [F; 3] { fn format() -> <$vec3 as GLSLType>::AttributeFormat { impl_attr_data!(@$arr F 3) } }
        impl<F:AttributeData<$vec1>> AttributeData<$vec4> for [F; 4] { fn format() -> <$vec4 as GLSLType>::AttributeFormat { impl_attr_data!(@$arr F 4) } }
    };

}

impl_attr_data!(@Int bool IntFormat::UByte);
impl_attr_data!(@Int gl_bool IntFormat::UInt);
impl_attr_data!(@Int i8 IntFormat::Byte);
impl_attr_data!(@Int u8 IntFormat::UByte);
impl_attr_data!(@Int i16 IntFormat::Short);
impl_attr_data!(@Int u16 IntFormat::UShort);
impl_attr_data!(@Int i32 IntFormat::Int);
impl_attr_data!(@Int u32 IntFormat::UInt);

impl AttributeData<float> for f32 { fn format() -> FloatFormat { FloatFormat::Float(FloatType::Float) }}
impl AttributeData<float> for f64 { fn format() -> FloatFormat { FloatFormat::Double }}

impl AttributeData<double> for f64 { fn format() -> DoubleFormat {DoubleFormat}}

impl_attr_data!(@IVec gl_bool bvec2 bvec3 bvec4);
impl_attr_data!(@IVec uint uvec2 uvec3 uvec4);
impl_attr_data!(@IVec int ivec2 ivec3 ivec4);
impl_attr_data!(@Vec float vec2 vec3 vec4);
impl_attr_data!(@Mat vec2 mat2 mat3x2 mat4x2);
impl_attr_data!(@Mat vec3 mat2x3 mat3 mat4x3);
impl_attr_data!(@Mat vec4 mat2x4 mat3x4 mat4);

impl_attr_data!(@DVec double dvec2 dvec3 dvec4);
impl_attr_data!(@Mat dvec2 dmat2 dmat3x2 dmat4x2);
impl_attr_data!(@Mat dvec3 dmat2x3 dmat3 dmat4x3);
impl_attr_data!(@Mat dvec4 dmat2x4 dmat3x4 dmat4);