changes to librw layer, GLES now runtime choice

src/extras/shaders/contrast.frag

@@ -2,17 +2,18 @@ uniform sampler2D tex0;
 uniform vec3 u_contrastAdd;
 uniform vec3 u_contrastMult;
 
-in vec4 v_color;
-in vec2 v_tex0;
-in float v_fog;
-
-out vec4 color;
+FSIN vec4 v_color;
+FSIN vec2 v_tex0;
+FSIN float v_fog;
 
 void
 main(void)
 {
 	vec4 dst = texture(tex0, vec2(v_tex0.x, 1.0-v_tex0.y));
+	vec4 color;
 	color.rgb = dst.rgb*u_contrastMult + u_contrastAdd;
 	color.a = 1.0f;
+
+	FRAGCOLOR(color);
 }