Reading from SSBO causes black screen and lag

OpenGL OpenGL: Basic Coding
1

I have already posted this question over on stackoverflow (I cannot put a link here, I’m sorry)

I tried porting my OpenCL raycaster to GLSL compute shaders. Only I’m having trouble with shader storage buffers. How I initiaize the buffer (constructor of class BufferGL):

GLBuffer::GLBuffer(GLint type, GLint usage, void * data, GLuint size)
{
    this->type = type;
    glGenBuffers(1, &buffer);
    this->bind();
    glBufferData(type, size, data, usage);
    this->unbind();
}

this is how (try to) attach the buffer to the shader:

void Shader::connectShaderStorageBuffer(GLBuffer & buffer, GLuint binding_point)
{
    this->bind();
    buffer.bind();
    buffer.bindBase(GL_SHADER_STORAGE_BUFFER, binding_point);
    buffer.unbind();
    this->unbind();
}

Putting the two together:

GLfloat f[3] = { 1, 2, 3 };
testBuffer = GLBuffer(GL_SHADER_STORAGE_BUFFER, GL_STATIC_COPY, &f, sizeof(f));
shader->connectShaderStorageBuffer(testBuffer, 2);

GLSL shader:


layout(std430, binding = 2) buffer floats
{
    float f[3];
};


void main()
{
    ivec2 coords = ivec2(gl_GlobalInvocationID.xy);

    //vec2 glcoords = vec2(coords.x/500, coords.y/500);

    //Ray r = camToRay(cam[0], glcoords);

    if(f[0] == 1)
    {
       imageStore(screen, coords, vec4(1,0,0,1));
    }else
    {
       imageStore(screen, coords, vec4(0,1,1,1));
    }
}

The shader works (without the “if(f[0] == 1)”-clause), however when reading from f I get a black screen and around 6fps (the shader doesn’t contain more code than shown). Any comment/suggesttion and of course answer is appreciated!