From 0b8fe2535084918d4338c022f90fd9f38be3e252 Mon Sep 17 00:00:00 2001
From: Hajime Hoshi <hajimehoshi@gmail.com>
Date: Fri, 17 Jun 2016 04:13:46 +0900
Subject: [PATCH] opengl: Implement GlslHighpSupported for iOS

---
 audio/internal/driver/driver_ios.go        | 2 ++
 internal/graphics/opengl/context_mobile.go | 5 +++--
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/audio/internal/driver/driver_ios.go b/audio/internal/driver/driver_ios.go
index ad7444992..302be9839 100644
--- a/audio/internal/driver/driver_ios.go
+++ b/audio/internal/driver/driver_ios.go
@@ -12,6 +12,8 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+// TODO: Can we unify this into driver_openal.go?
+
 // +build ios darwin,arm darwin,arm64
 
 package driver
diff --git a/internal/graphics/opengl/context_mobile.go b/internal/graphics/opengl/context_mobile.go
index 8c1d68808..c670a1034 100644
--- a/internal/graphics/opengl/context_mobile.go
+++ b/internal/graphics/opengl/context_mobile.go
@@ -256,8 +256,9 @@ func (c *Context) DeleteShader(s Shader) {
 }
 
 func (c *Context) GlslHighpSupported() bool {
-	// TODO: Fix this
-	return false
+	gl := c.gl
+	_, _, precision := gl.GetShaderPrecisionFormat(mgl.FRAGMENT_SHADER, mgl.HIGH_FLOAT)
+	return precision != 0
 }
 
 func (c *Context) NewProgram(shaders []Shader) (Program, error) {