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https://github.com/curioustorvald/Terrarum.git
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30 lines
1.1 KiB
GLSL
30 lines
1.1 KiB
GLSL
#version 120
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#ifdef GL_ES
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precision mediump float;
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#endif
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varying vec4 v_color;
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varying vec2 v_texCoords;
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uniform sampler2D u_texture;
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// recommended value: n / vec2(fbo_width, fbo_height) where n is something like {0.5, 1, 2, 4, ... }
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// that, or simply 0.5, depending on how your uv coord works
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uniform vec2 halfpixel = vec2(0.0, 0.0);
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vec2 doublex = vec2(2.0, 0.0);
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vec2 doubley = vec2(0.0, 2.0);
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vec2 twister = vec2(1.0, -1.0);
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void main() {
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vec4 sum = texture2D(u_texture, v_texCoords - halfpixel * doublex);
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sum += texture2D(u_texture, v_texCoords - halfpixel * twister) * 2.0;
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sum += texture2D(u_texture, v_texCoords + halfpixel * doubley);
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sum += texture2D(u_texture, v_texCoords + halfpixel) * 2.0;
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sum += texture2D(u_texture, v_texCoords + halfpixel * doublex);
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sum += texture2D(u_texture, v_texCoords + halfpixel * twister) * 2.0;
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sum += texture2D(u_texture, v_texCoords - halfpixel * doubley);
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sum += texture2D(u_texture, v_texCoords - halfpixel) * 2.0;
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gl_FragColor = sum / 12.0;
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// gl_FragColor = texture2D(u_texture, v_texCoords);
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} |