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#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&);
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 Value>
class UniformState {
public:
UniformState(UniformLocation location_ = -1) : location(std::move(location_)) {
}
void operator=(const Value& value) {
if (location >= 0 && (!current || *current != value)) {
current = value;
bindUniform(location, value);
}
}
UniformLocation location;
optional<Value> current = {};
};
UniformLocation uniformLocation(ProgramID, const char * name);
template <class>
class Uniforms;
template <class... Us>
class Uniforms<TypeList<Us...>> final {
public:
using Types = TypeList<Us...>;
using State = IndexedTuple<TypeList<Us...>, TypeList<UniformState<typename Us::Value>...>>;
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::Value>(active.at(Us::name()))
: false)... });
#endif
return State(uniformLocation(id, Us::name())...);
}
template <class Program>
static State loadNamedLocations(const Program& program) {
return State(UniformState<typename Us::Value>(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)... });
}
};
} // namespace gl
} // namespace mbgl
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