raylib-cs/ExampleApplication/Examples/resources/shaders/glsl330/blur.fs

#version 330

// Input vertex attributes (from vertex shader)
in vec2 fragTexCoord;
in vec4 fragColor;

// Input uniform values
uniform sampler2D texture0;
uniform vec4 colDiffuse;

// Output fragment color
out vec4 finalColor;

// NOTE: Add here your custom variables

// NOTE: Render size values must be passed from code
const float renderWidth = 800;
const float renderHeight = 450;

float offset[3] = float[](0.0, 1.3846153846, 3.2307692308);
float weight[3] = float[](0.2270270270, 0.3162162162, 0.0702702703);

void main()
{
    // Texel color fetching from texture sampler
    vec3 texelColor = texture(texture0, fragTexCoord).rgb*weight[0];
    
    for (int i = 1; i < 3; i++) 
    {
        texelColor += texture(texture0, fragTexCoord + vec2(offset[i])/renderWidth, 0.0).rgb*weight[i];
        texelColor += texture(texture0, fragTexCoord - vec2(offset[i])/renderWidth, 0.0).rgb*weight[i];
    }

    finalColor = vec4(texelColor, 1.0);
}