diff options
Diffstat (limited to 'src/mbgl/gl/attribute.hpp')
-rw-r--r-- | src/mbgl/gl/attribute.hpp | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/src/mbgl/gl/attribute.hpp b/src/mbgl/gl/attribute.hpp index 62c89178cd..c7f9ba3fd4 100644 --- a/src/mbgl/gl/attribute.hpp +++ b/src/mbgl/gl/attribute.hpp @@ -95,5 +95,36 @@ public: } }; +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 |