perf: optmize world rendering performance

src/shaders/fShader.glsl

@@ -1,11 +1,12 @@
 #version 430
 
 in vec2 tc;
+flat in int tex_layer;
 out vec4 color;
 
-layout (binding = 0) uniform sampler2D samp;
+layout (binding = 0) uniform sampler2DArray samp;
 
 void main(void) {
-    color = texture(samp, tc);
+    color = texture(samp, vec3(tc, tex_layer));
     //color = varyingColor;
 }