34 lines
998 B
GLSL
34 lines
998 B
GLSL
#version 140
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uniform sampler2D u_sampler;
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uniform mat3 u_convolution_matrix;
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uniform vec2 u_viewport_size;
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in vec2 tex_coords;
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out vec4 frag_color;
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vec4 sample(float offsetX, float offsetY)
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{
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return texture(u_sampler, vec2(tex_coords.x + offsetX, tex_coords.y + offsetY));
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}
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void main()
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{
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vec4 pixels[9];
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float deltaWidth = 1.0 / u_viewport_size.x;
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float deltaHeight = 1.0 / u_viewport_size.y;
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pixels[0] = sample(-deltaWidth, deltaHeight );
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pixels[1] = sample(0.0, deltaHeight );
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pixels[2] = sample(deltaWidth, deltaHeight );
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pixels[3] = sample(-deltaWidth, 0.0);
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pixels[4] = sample(0.0, 0.0);
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pixels[5] = sample(deltaWidth, 0.0);
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pixels[6] = sample(-deltaWidth, -deltaHeight);
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pixels[7] = sample(0.0, -deltaHeight);
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pixels[8] = sample(deltaWidth, -deltaHeight);
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vec4 accumulator = vec4(0.0);
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for (int i = 0; i < 9; ++i)
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{
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accumulator += pixels[i] * u_convolution_matrix[i / 3][i % 3];
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}
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frag_color = accumulator;
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} |