fragment.glsl

#define numTextures 7
#define THRESHOLD 0.2

uniform vec3 iResolution;
uniform float iTime;
uniform float iTimeDelta;
uniform float iFrame;

uniform sampler2D u_texture;
// uniform sampler2D u_textures;
// uniform float[] u_transition_values;

uniform vec3 u_plane_resolution;
uniform vec3 u_aspect_ratio;
uniform float u_opacity;

varying vec2 vUv;

float gscale (vec3 c) { 
	return (c.r+c.g+c.b)/3.0;
}

vec4 resizedTexture(sampler2D texture, vec2 inital_uv, vec3 aspect_ratio)
{
	vec2 ratio = vec2(
		min((u_plane_resolution.x / u_plane_resolution.y) / (aspect_ratio.x / aspect_ratio.y), 1.0),
		min((u_plane_resolution.y / u_plane_resolution.x) / (aspect_ratio.y / aspect_ratio.x), 1.0)
	);

	vec2 uv = vec2(
		inital_uv.x * ratio.x + (1.0 - ratio.x) * 0.5,
		inital_uv.y * ratio.y + (1.0 - ratio.y) * 0.5
	);

	return texture2D(texture, uv);
}

void mainImage (out vec4 fragColor, in vec2 fragCoord)
{
	// vec4 mixedTextures = texture2D(u_texture[0], vUv);
	// foreach(textures)
	// {
	// 	vec4 newText = texture2D(u_texture[0], vUv);
	// 	vec4 mixedTextures = mix(mixedTextures, newText, u_transition_values[0]);
	// }

	fragColor = resizedTexture(u_texture, vUv, u_aspect_ratio) * u_opacity;
}

void main() {
	mainImage(gl_FragColor, gl_FragCoord.xy);
}