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#ifdef GL_ES #ifdef GL_FRAGMENT_PRECISION_HIGH precision highp float; #else precision mediump float; #endif #endif uniform sampler2D tex; varying vec2 tex_c; void main() { float inten = dot(texture2D(tex,tex_c.xy).rgb,vec3(.3, .59, .11)); gl_FragColor = vec4(inten, inten, inten, texture2D(tex,tex_c.xy).a); }