From cc39cdc8f51de335dc06e3de6f133f0f2d0fda6e Mon Sep 17 00:00:00 2001
From: Hajime Hoshi <hajimehoshi@gmail.com>
Date: Fri, 1 Jul 2016 02:40:53 +0900
Subject: [PATCH] opengl: Bug fix: glGetShaderPrecisionFormat returns wrong
 values on emulators (#239)

---
 internal/graphics/opengl/context_mobile.go | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/internal/graphics/opengl/context_mobile.go b/internal/graphics/opengl/context_mobile.go
index 3d782396f..7b6261185 100644
--- a/internal/graphics/opengl/context_mobile.go
+++ b/internal/graphics/opengl/context_mobile.go
@@ -260,6 +260,11 @@ func (c *Context) DeleteShader(s Shader) {
 func (c *Context) GlslHighpSupported() bool {
 	gl := c.gl
 	_, _, precision := gl.GetShaderPrecisionFormat(mgl.FRAGMENT_SHADER, mgl.HIGH_FLOAT)
+	// On Android emulators, precision might be a wrong value (#239).
+	// TODO: If possible, check if this is running on an emulator.
+	if 64 <= precision {
+		return false
+	}
 	return precision != 0
 }