17 lines
407 B
GLSL
17 lines
407 B
GLSL
#version 300 es
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precision highp float;
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in vec2 v_texcoord;
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uniform sampler2D tex;
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out vec4 fragColor;
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void main() {
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vec4 c = texture(tex, v_texcoord);
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float r = dot(c.rgb, vec3(0.393, 0.769, 0.189));
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float g = dot(c.rgb, vec3(0.349, 0.686, 0.168));
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float b = dot(c.rgb, vec3(0.272, 0.534, 0.131));
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fragColor = vec4(clamp(r, 0.0, 1.0), clamp(g, 0.0, 1.0), clamp(b, 0.0, 1.0), c.a);
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}
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