Use ESSL 1.0 for EGLRenderer shaders

We still ostensibly support GLES 2.0 GPUs.

app/shaders/egl.vert

@@ -5,4 +5,4 @@ varying vec2 vTexCoord;
 void main() {
     vTexCoord = aTexCoord;
     gl_Position = vec4(aPosition, 0, 1);
-}
+}

app/shaders/egl_nv12.frag

@@ -1,9 +1,7 @@
-#version 300 es
 #extension GL_OES_EGL_image_external : require
 precision mediump float;
-out vec4 FragColor;
 
-in vec2 vTextCoord;
+varying vec2 vTexCoord;
 
 uniform mat3 yuvmat;
 uniform vec3 offset;
@@ -12,11 +10,11 @@ uniform samplerExternalOES plane1;
 uniform samplerExternalOES plane2;
 
 void main() {
-	vec3 YCbCr = vec3(
-		texture2D(plane1, vTextCoord)[0],
-	        texture2D(plane2, vTextCoord + chromaOffset).xy
-	);
+    vec3 YCbCr = vec3(
+        texture2D(plane1, vTexCoord)[0],
+            texture2D(plane2, vTexCoord + chromaOffset).xy
+    );
 
-	YCbCr -= offset;
-	FragColor = vec4(clamp(yuvmat * YCbCr, 0.0, 1.0), 1.0f);
+    YCbCr -= offset;
+    gl_FragColor = vec4(clamp(yuvmat * YCbCr, 0.0, 1.0), 1.0f);
 }

app/shaders/egl_nv12.vert

@@ -1,10 +0,0 @@
-#version 300 es
-
-layout (location = 0) in vec2 aPosition; // 2D: X,Y
-layout (location = 1) in vec2 aTexCoord;
-out vec2 vTextCoord;
-
-void main() {
-	vTextCoord = aTexCoord;
-	gl_Position = vec4(aPosition, 0, 1);
-}

app/shaders/egl_opaque.frag

@@ -1,12 +1,10 @@
-#version 300 es
 #extension GL_OES_EGL_image_external : require
 precision mediump float;
-out vec4 FragColor;
 
-in vec2 vTextCoord;
+varying vec2 vTexCoord;
 
 uniform samplerExternalOES uTexture;
 
 void main() {
-        FragColor = texture2D(uTexture, vTextCoord);
+    gl_FragColor = texture2D(uTexture, vTexCoord);
 }

app/shaders/egl_opaque.vert

@@ -1,10 +0,0 @@
-#version 300 es
-
-layout (location = 0) in vec2 aPosition; // 2D: X,Y
-layout (location = 1) in vec2 aTexCoord;
-out vec2 vTextCoord;
-
-void main() {
-	vTextCoord = aTexCoord;
-	gl_Position = vec4(aPosition, 0, 1);
-}

app/shaders/egl_overlay.frag

@@ -1,4 +1,5 @@
 precision mediump float;
+
 uniform sampler2D uTexture;
 varying vec2 vTexCoord;