Innovative Zoom Shader

This shader code provides a powerful zoom effect for images in Godot 3.x while offering additional control options. It enables zooming on an image without flipping it and maintains transparency when the image exceeds the boundaries. The shader includes features such as the ability to keep the image within the bounds, adjust brightness and contrast, ensuring versatile and customizable visual effects. With this shader, developers can create engaging zoom functionalities while maintaining full control over the appearance of the image.

Shader code

shader_type canvas_item;

uniform sampler2D texture;
uniform vec2 zoom_center;
uniform float zoom_amount;
uniform bool keep_within_bounds;

void fragment() {
    // Coordinate UV dell'immagine originale
    vec2 uv = SCREEN_UV;
    
    // Calcolo delle coordinate UV traslate rispetto al centro dello zoom
    vec2 zoomed_uv = (uv - zoom_center) * zoom_amount + zoom_center;
    
    // Se keep_within_bounds è abilitato, limita le coordinate UV all'intervallo (0-1)
    if (keep_within_bounds) {
        zoomed_uv = clamp(zoomed_uv, vec2(0.0), vec2(1.0));
    }
    
    // Se le coordinate UV traslate sono fuori dai limiti (0-1), imposta il colore del pixel trasparente
    if (zoomed_uv.x < 0.0 || zoomed_uv.x > 1.0 || zoomed_uv.y < 0.0 || zoomed_uv.y > 1.0) {
        COLOR = vec4(0.0, 0.0, 0.0, 0.0);
    } else {
        // Altrimenti, leggi il colore dell'immagine originale alle coordinate UV traslate
        vec2 tex_uv = vec2(zoomed_uv.x, 1.0 - zoomed_uv.y);
        COLOR = textureLod(texture, tex_uv, 0.0);
    }
}

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