Gaussian Blur Blobs?

OpenGL Development
#1

I’m trying to implement bloom, and it’s pretty easy, but there’s one problem.

It’s working, but it looks like this from afar:

https://anuj-rao.tinytake.com/media/3fa4d8?filename=1475388942808_02-10-2016-02-14-57.png&sub_type=thumbnail_preview&type=attachment&width=700&height=416&_felix_session_id=62a90cf0c520af69cd213f003c6a6701&salt=MTAxMzQ1NV80MTcwOTY4

See those weird blobs? I’m not downsampling, but I think it’s a resolution issue. It gets worse as I move further away.

Here’s my vertical blur shader:


#version 400 core

in vec2 passTextureCoords;

out vec4 outColour;

uniform sampler2D textureSampler;

uniform float weights[5] = float[] (0.227027, 0.1945946, 0.1216216, 0.054054, 0.016216);

void main(void) {

    vec2 texelSize = 1.0/textureSize(textureSampler, 0);
    vec4 colour = texture(textureSampler, passTextureCoords) * weights[0];

    for(int i = 1; i < 5; ++i){
        colour += texture(textureSampler, passTextureCoords + vec2(0, texelSize.y * i)) * weights[i];
        colour += texture(textureSampler, passTextureCoords - vec2(0, texelSize.y * i)) * weights[i];
    }

    outColour = colour;

}

Here’s my horizontal blur shader:


#version 400 core

in vec2 passTextureCoords;

out vec4 outColour;

uniform sampler2D textureSampler;

uniform float weights[5] = float[] (0.227027, 0.1945946, 0.1216216, 0.054054, 0.016216);

void main(void) {

    vec2 texelSize = 1.0/textureSize(textureSampler, 0);
    vec4 colour = texture(textureSampler, passTextureCoords) * weights[0];

    for(int i = 1; i < 5; ++i){
        colour += texture(textureSampler, passTextureCoords + vec2(texelSize.x * i, 0)) * weights[i];
        colour += texture(textureSampler, passTextureCoords - vec2(texelSize.x * i, 0)) * weights[i];
    }

    outColour = colour;

}

Here’s what it’s supposed to look like:

As you can see, there aren’t any weird blobs in this image.

This is my second attempt to implement bloom. I had the same problem the last time, and since it’s such an awesome effect, I’d love to be able to implement it successfully. Thanks.