1 files changed, 34 insertions, 0 deletions
diff --git a/src/mbgl/gl/texture_filter_anisotropic_extension.hpp b/src/mbgl/gl/texture_filter_anisotropic_extension.hpp
new file mode 100644
index 0000000000..041820ecaa
--- /dev/null
+++ b/src/mbgl/gl/texture_filter_anisotropic_extension.hpp
@@ -0,0 +1,34 @@
+#pragma once
+
+#include <mbgl/gl/features.hpp>
+#include <mbgl/gl/extension.hpp>
+#include <mbgl/gl/gl.hpp>
+
+#define GL_TEXTURE_MAX_ANISOTROPY                  0x84FE
+#define GL_MAX_TEXTURE_MAX_ANISOTROPY              0x84FF
+
+namespace mbgl {
+namespace gl {
+namespace extension {
+
+class TextureFilterAnisotropic {
+public:
+    template <typename Fn>
+    TextureFilterAnisotropic(const Fn& loadExtension)
+        : available(loadExtension({ "GL_EXT_texture_filter_anisotropic" })),
+          maximum([this] {
+              float value = 1.0f;
+              if (available) {
+                  MBGL_CHECK_ERROR(glGetFloatv(GL_MAX_TEXTURE_MAX_ANISOTROPY, &value));
+              }
+              return value;
+          }()) {
+    }
+
+    const bool available;
+    const TextureAnisotropic maximum;
+};
+
+} // namespace extension
+} // namespace gl
+} // namespace mbgl