Added WrapMode MirrorOnceClampToEdge

Used by splatoon 2

src/video_core/renderer_opengl/maxwell_to_gl.h

@@ -147,6 +147,8 @@ inline GLenum WrapMode(Tegra::Texture::WrapMode wrap_mode) {
         // GL_CLAMP_TO_BORDER to get the border color of the texture, and then sample the edge to
         // manually mix them. However the shader part of this is not yet implemented.
         return GL_CLAMP_TO_BORDER;
+    case Tegra::Texture::WrapMode::MirrorOnceClampToEdge:
+        return GL_MIRROR_CLAMP_TO_EDGE;
     }
     LOG_CRITICAL(Render_OpenGL, "Unimplemented texture wrap mode={}", static_cast<u32>(wrap_mode));
     UNREACHABLE();