117 lines
3.9 KiB
C++
117 lines
3.9 KiB
C++
#pragma once
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#include <mbgl/gfx/attribute.hpp>
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#include <mbgl/gl/types.hpp>
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#include <mbgl/programs/attributes.hpp>
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#include <mbgl/util/literal.hpp>
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#include <vector>
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#include <string>
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#include <optional>
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namespace mbgl {
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namespace gl {
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using AttributeBindingArray = std::vector<std::optional<gfx::AttributeBinding>>;
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using NamedAttributeLocations = std::vector<std::pair<const std::string, AttributeLocation>>;
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std::optional<AttributeLocation> queryLocation(ProgramID id, const char* name);
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template <class>
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class AttributeLocations;
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template <class... As>
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class AttributeLocations<TypeList<As...>> final {
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private:
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using Locations = IndexedTuple<TypeList<As...>, TypeList<ExpandToType<As, std::optional<AttributeLocation>>...>>;
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Locations locations;
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public:
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AttributeLocations() = default;
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void queryLocations(const ProgramID& id) {
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locations = Locations{
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queryLocation(id, concat_literals<&string_literal<'a', '_'>::value, &As::name>::value())...};
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using TypeOfFirst = typename std::tuple_element_t<0, std::tuple<As...>>;
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[[maybe_unused]] auto first = locations.template get<TypeOfFirst>();
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assert(first && first.value() == 0);
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}
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static constexpr const char* getFirstAttribName() {
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// Static assert that attribute list starts with position: we bind it on location 0.
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using TypeOfFirst = typename std::tuple_element_t<0, std::tuple<As...>>;
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static_assert(std::is_same<attributes::pos, TypeOfFirst>::value ||
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std::is_same<attributes::pos_offset, TypeOfFirst>::value ||
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std::is_same<attributes::pos_normal, TypeOfFirst>::value,
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"Program must start with position related attribute.");
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return concat_literals<&string_literal<'a', '_'>::value, TypeOfFirst::name>::value();
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}
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NamedAttributeLocations getNamedLocations() const {
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NamedAttributeLocations result;
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auto maybeAddLocation = [&](const std::string& name, const std::optional<AttributeLocation>& location) {
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if (location) {
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result.emplace_back(name, *location);
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}
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};
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util::ignore({(maybeAddLocation(concat_literals<&string_literal<'a', '_'>::value, &As::name>::value(),
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locations.template get<As>()),
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0)...});
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return result;
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}
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AttributeBindingArray toBindingArray(const gfx::AttributeBindings<TypeList<As...>>& bindings) const {
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AttributeBindingArray result;
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result.resize(sizeof...(As));
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auto maybeAddBinding = [&](const std::optional<AttributeLocation>& location,
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const std::optional<gfx::AttributeBinding>& binding) {
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if (location) {
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result.at(*location) = binding;
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}
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};
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util::ignore({(maybeAddBinding(locations.template get<As>(), bindings.template get<As>()), 0)...});
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return result;
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}
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};
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template <class>
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class AttributeKey;
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constexpr auto attributeDefinePrefix() {
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return "#define HAS_UNIFORM_u_";
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}
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template <class... As>
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class AttributeKey<TypeList<As...>> final {
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public:
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static_assert(sizeof...(As) <= 32, "attribute count exceeds 32");
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static uint32_t compute(const gfx::AttributeBindings<TypeList<As...>>& bindings) {
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uint32_t value = 0;
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util::ignore(
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{(bindings.template get<As>() ? (void)(value |= 1 << TypeIndex<As, As...>::value) : (void)0, 0)...});
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return value;
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}
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static std::string defines(const gfx::AttributeBindings<TypeList<As...>>& bindings) {
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std::string result;
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util::ignore(
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{(!bindings.template get<As>()
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? (void)(result +=
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concat_literals<&attributeDefinePrefix, &As::name, &string_literal<'\n'>::value>::value())
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: (void)0,
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0)...});
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return result;
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}
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};
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} // namespace gl
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} // namespace mbgl
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