57 lines
1.8 KiB
GLSL
57 lines
1.8 KiB
GLSL
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#version 430 core
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out vec4 FragColor;
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in vec2 texCoords;
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uniform sampler2D screenTexture;
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uniform bool horizontal;
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// How far from the center to take samples from the fragment you are currently on
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const int radius = 6;
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// Keep it between 1.0f and 2.0f (the higher this is the further the blur reaches)
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float spreadBlur = 2.0f;
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float weights[radius];
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void main()
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{
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// Calculate the weights using the Gaussian equation
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float x = 0.0f;
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for (int i = 0; i < radius; i++)
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{
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// Decides the distance between each sample on the Gaussian function
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if (spreadBlur <= 2.0f)
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x += 3.0f / radius;
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else
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x += 6.0f / radius;
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weights[i] = exp(-0.5f * pow(x / spreadBlur, 2.0f)) / (spreadBlur * sqrt(2 * 3.14159265f));
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}
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vec2 tex_offset = 1.0f / textureSize(screenTexture, 0);
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vec3 result = texture(screenTexture, texCoords).rgb * weights[0];
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// Calculate horizontal blur
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if(horizontal)
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{
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for(int i = 1; i < radius; i++)
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{
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// Take into account pixels to the right
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result += texture(screenTexture, texCoords + vec2(tex_offset.x * i, 0.0)).rgb * weights[i];
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// Take into account pixels on the left
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result += texture(screenTexture, texCoords - vec2(tex_offset.x * i, 0.0)).rgb * weights[i];
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}
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}
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// Calculate vertical blur
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else
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{
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for(int i = 1; i < radius; i++)
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{
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// Take into account pixels above
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result += texture(screenTexture, texCoords + vec2(0.0, tex_offset.y * i)).rgb * weights[i];
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// Take into account pixels below
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result += texture(screenTexture, texCoords - vec2(0.0, tex_offset.y * i)).rgb * weights[i];
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}
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}
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FragColor = vec4(result, 1.0f);
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}
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