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
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
|
#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 <vector>
#include <map>
#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;
};
class ActiveUniform {
public:
std::size_t size;
UniformDataType type;
};
#ifndef NDEBUG
template <class T>
bool verifyUniform(const ActiveUniform&);
using ActiveUniforms = std::map<std::string, ActiveUniform>;
ActiveUniforms activeUniforms(ProgramID);
#endif
template <class Tag, class T>
class Uniform {
public:
using Value = UniformValue<Tag, T>;
using Type = T;
class State {
public:
State(UniformLocation location_) : location(std::move(location_)) {}
void operator=(const Value& value) {
if (location >= 0 && (!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 auto name() { return #name_; } }
#define MBGL_DEFINE_UNIFORM_VECTOR(type_, n_, name_) \
struct name_ : ::mbgl::gl::UniformVector<name_, type_, n_> { static auto name() { return #name_; } }
#define MBGL_DEFINE_UNIFORM_MATRIX(type_, n_, name_) \
struct name_ : ::mbgl::gl::UniformMatrix<name_, type_, n_> { static auto name() { return #name_; } }
UniformLocation uniformLocation(ProgramID, const char * name);
template <class... Us>
class Uniforms {
public:
using Types = TypeList<Us...>;
using State = IndexedTuple<TypeList<Us...>, TypeList<typename Us::State...>>;
using Values = IndexedTuple<TypeList<Us...>, TypeList<typename Us::Value...>>;
using NamedLocations = std::vector<std::pair<const std::string, UniformLocation>>;
static State bindLocations(const ProgramID& id) {
#ifndef NDEBUG
// Verify active uniform types match the enum
const auto active = activeUniforms(id);
util::ignore(
{ // Some shader programs have uniforms declared, but not used, so they're not active.
// Therefore, we'll only verify them when they are indeed active.
(active.find(Us::name()) != active.end()
? verifyUniform<typename Us::Type>(active.at(Us::name()))
: false)... });
#endif
return State { { uniformLocation(id, Us::name()) }... };
}
template <class Program>
static State loadNamedLocations(const Program& program) {
return State(typename Us::State(program.uniformLocation(Us::name()))...);
}
static NamedLocations getNamedLocations(const State& state) {
return NamedLocations{ { Us::name(), state.template get<Us>().location }... };
}
static void bind(State& state, const Values& values) {
util::ignore({ (state.template get<Us>() = values.template get<Us>(), 0)... });
}
};
template <class... Us>
using ConcatenateUniforms = typename TypeListConcat<typename Us::Types...>::template ExpandInto<Uniforms>;
} // namespace gl
} // namespace mbgl
|
