1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
|
#pragma once
#include <mbgl/gl/types.hpp>
#include <mbgl/util/optional.hpp>
#include <mbgl/util/ignore.hpp>
#include <mbgl/util/indexed_tuple.hpp>
#include <array>
#include <functional>
namespace mbgl {
namespace gl {
template <class T>
void bindUniform(UniformLocation, const T&);
template <class Tag, class T>
class UniformValue {
public:
explicit UniformValue(T t_) : t(std::move(t_)) {}
T t;
};
template <class Tag, class T>
class Uniform {
public:
using Value = UniformValue<Tag, T>;
class State {
public:
void operator=(const Value& value) {
if (!current || *current != value.t) {
current = value.t;
bindUniform(location, value.t);
}
}
UniformLocation location;
optional<T> current = {};
};
};
template <class Tag, class T>
using UniformScalar = Uniform<Tag, T>;
template <class Tag, class T, size_t N>
using UniformVector = Uniform<Tag, std::array<T, N>>;
template <class Tag, class T, size_t N>
using UniformMatrix = Uniform<Tag, std::array<T, N*N>>;
#define MBGL_DEFINE_UNIFORM_SCALAR(type_, name_) \
struct name_ : ::mbgl::gl::UniformScalar<name_, type_> { static constexpr auto name = #name_; }
#define MBGL_DEFINE_UNIFORM_VECTOR(type_, n_, name_) \
struct name_ : ::mbgl::gl::UniformVector<name_, type_, n_> { static constexpr auto name = #name_; }
#define MBGL_DEFINE_UNIFORM_MATRIX(type_, n_, name_) \
struct name_ : ::mbgl::gl::UniformMatrix<name_, type_, n_> { static constexpr auto name = #name_; }
UniformLocation uniformLocation(ProgramID, const char * name);
template <class... Us>
class Uniforms {
public:
using State = IndexedTuple<TypeList<Us...>, TypeList<typename Us::State...>>;
using Values = IndexedTuple<TypeList<Us...>, TypeList<typename Us::Value...>>;
static State state(const ProgramID& id) {
return State { { uniformLocation(id, Us::name) }... };
}
static std::function<void ()> binder(State& state, Values&& values_) {
return [&state, values = std::move(values_)] () mutable {
util::ignore({ (state.template get<Us>() = values.template get<Us>(), 0)... });
};
}
};
} // namespace gl
} // namespace mbgl
|
