#import "Common/ShaderLib/GLSLCompat.glsllib"

uniform sampler2D m_Texture;
uniform float     m_BlurScale;

in vec2 texCoord;

// 5x5 Gauß-Kernel (σ≈1.2, vollständig normiert)
void main() {
    vec2 ts = m_BlurScale / vec2(textureSize(m_Texture, 0));

    vec4 c = vec4(0.0);

    c += texture2D(m_Texture, texCoord + vec2(-2.0, -2.0) * ts) * 0.00731;
    c += texture2D(m_Texture, texCoord + vec2(-1.0, -2.0) * ts) * 0.02075;
    c += texture2D(m_Texture, texCoord + vec2( 0.0, -2.0) * ts) * 0.02936;
    c += texture2D(m_Texture, texCoord + vec2( 1.0, -2.0) * ts) * 0.02075;
    c += texture2D(m_Texture, texCoord + vec2( 2.0, -2.0) * ts) * 0.00731;

    c += texture2D(m_Texture, texCoord + vec2(-2.0, -1.0) * ts) * 0.02075;
    c += texture2D(m_Texture, texCoord + vec2(-1.0, -1.0) * ts) * 0.05890;
    c += texture2D(m_Texture, texCoord + vec2( 0.0, -1.0) * ts) * 0.08334;
    c += texture2D(m_Texture, texCoord + vec2( 1.0, -1.0) * ts) * 0.05890;
    c += texture2D(m_Texture, texCoord + vec2( 2.0, -1.0) * ts) * 0.02075;

    c += texture2D(m_Texture, texCoord + vec2(-2.0,  0.0) * ts) * 0.02936;
    c += texture2D(m_Texture, texCoord + vec2(-1.0,  0.0) * ts) * 0.08334;
    c += texture2D(m_Texture, texCoord + vec2( 0.0,  0.0) * ts) * 0.11792;
    c += texture2D(m_Texture, texCoord + vec2( 1.0,  0.0) * ts) * 0.08334;
    c += texture2D(m_Texture, texCoord + vec2( 2.0,  0.0) * ts) * 0.02936;

    c += texture2D(m_Texture, texCoord + vec2(-2.0,  1.0) * ts) * 0.02075;
    c += texture2D(m_Texture, texCoord + vec2(-1.0,  1.0) * ts) * 0.05890;
    c += texture2D(m_Texture, texCoord + vec2( 0.0,  1.0) * ts) * 0.08334;
    c += texture2D(m_Texture, texCoord + vec2( 1.0,  1.0) * ts) * 0.05890;
    c += texture2D(m_Texture, texCoord + vec2( 2.0,  1.0) * ts) * 0.02075;

    c += texture2D(m_Texture, texCoord + vec2(-2.0,  2.0) * ts) * 0.00731;
    c += texture2D(m_Texture, texCoord + vec2(-1.0,  2.0) * ts) * 0.02075;
    c += texture2D(m_Texture, texCoord + vec2( 0.0,  2.0) * ts) * 0.02936;
    c += texture2D(m_Texture, texCoord + vec2( 1.0,  2.0) * ts) * 0.02075;
    c += texture2D(m_Texture, texCoord + vec2( 2.0,  2.0) * ts) * 0.00731;

    gl_FragColor = c; // Gewichte summieren sich auf 1.0
}