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19 lines
395 B
GLSL
19 lines
395 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 pixColor = texture(tex, v_texcoord);
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float gray = 0.0;
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// Get gray with luminosity and hdr
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// https://en.wikipedia.org/wiki/Grayscale#Luma_coding_in_video_systems
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gray = dot(pixColor.rgb, vec3(0.2627, 0.6780, 0.0593));
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fragColor = vec4(vec3(gray), pixColor.a);
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}
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