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#pragma once
#include <mbgl/gfx/attribute.hpp>
#include <mbgl/gl/types.hpp>
#include <mbgl/util/ignore.hpp>
#include <mbgl/util/literal.hpp>
#include <mbgl/util/indexed_tuple.hpp>
#include <mbgl/util/optional.hpp>
#include <cstddef>
#include <vector>
#include <set>
#include <functional>
#include <string>
#include <array>
#include <limits>
namespace mbgl {
namespace gl {
using AttributeBindingArray = std::vector<optional<gfx::AttributeBinding>>;
using NamedAttributeLocations = std::vector<std::pair<const std::string, AttributeLocation>>;
class Context;
void bindAttributeLocation(Context&, ProgramID, AttributeLocation, const char * name);
std::set<std::string> getActiveAttributes(ProgramID);
template <class>
class AttributeLocations;
template <class... As>
class AttributeLocations<TypeList<As...>> final {
private:
using Locations =
IndexedTuple<TypeList<As...>, TypeList<ExpandToType<As, optional<AttributeLocation>>...>>;
Locations locations;
public:
AttributeLocations(Context& context, const ProgramID& id)
: locations([&] {
std::set<std::string> activeAttributes = getActiveAttributes(id);
AttributeLocation location = 0;
auto maybeBindLocation = [&](const char* name) -> optional<AttributeLocation> {
if (activeAttributes.count(name)) {
bindAttributeLocation(context, id, location, name);
return location++;
} else {
return {};
}
};
return Locations{ maybeBindLocation(
concat_literals<&string_literal<'a', '_'>::value, &As::name>::value())... };
}()) {
}
template <class BinaryProgram>
AttributeLocations(const BinaryProgram& program)
: locations{ program.attributeLocation(
concat_literals<&string_literal<'a', '_'>::value, &As::name>::value())... } {
}
NamedAttributeLocations getNamedLocations() const {
NamedAttributeLocations result;
auto maybeAddLocation = [&] (const std::string& name, const optional<AttributeLocation>& location) {
if (location) {
result.emplace_back(name, *location);
}
};
util::ignore({ (maybeAddLocation(concat_literals<&string_literal<'a', '_'>::value, &As::name>::value(),
locations.template get<As>()),
0)... });
return result;
}
AttributeBindingArray toBindingArray(const gfx::AttributeBindings<TypeList<As...>>& bindings) const {
AttributeBindingArray result;
result.resize(sizeof...(As));
auto maybeAddBinding = [&] (const optional<AttributeLocation>& location,
const optional<gfx::AttributeBinding>& binding) {
if (location) {
result.at(*location) = binding;
}
};
util::ignore({ (maybeAddBinding(locations.template get<As>(), bindings.template get<As>()), 0)... });
return result;
}
};
template <class>
class AttributeKey;
constexpr auto attributeDefinePrefix() {
return "#define HAS_UNIFORM_u_";
}
template <class... As>
class AttributeKey<TypeList<As...>> final {
public:
static_assert(sizeof...(As) <= 32, "attribute count exceeds 32");
static uint32_t compute(const gfx::AttributeBindings<TypeList<As...>>& bindings) {
uint32_t value = 0;
util::ignore(
{ (bindings.template get<As>() ? (void)(value |= 1 << TypeIndex<As, As...>::value)
: (void)0,
0)... });
return value;
}
static std::string defines(const gfx::AttributeBindings<TypeList<As...>>& bindings) {
std::string result;
util::ignore({ (!bindings.template get<As>()
? (void)(result += concat_literals<&attributeDefinePrefix, &As::name, &string_literal<'\n'>::value>::value())
: (void)0,
0)... });
return result;
}
};
} // namespace gl
} // namespace mbgl
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