refactor shaders

res/shaders/main.glslf

@@ -12,7 +12,7 @@ in vec3 a_realnormal;
 in vec4 a_modelpos;
 
 uniform sampler2D u_texture0;
-uniform samplerCube u_cubemap;
+uniform samplerCube u_skybox;
 uniform sampler2DShadow u_shadows;
 uniform vec3 u_sunDir;
 uniform int u_shadowsRes;
@@ -25,35 +25,11 @@ uniform bool u_enableShadows;
 
 uniform mat4 u_shadowsMatrix;
 
-const int BLUR_SAMPLES = 6;
+#include <shadows>
 
 void main() {
-    float shadow = 1.0;
-    if (u_enableShadows) {
-        vec4 mpos = u_shadowsMatrix * vec4(a_modelpos.xyz + a_realnormal * 0.08, 1.0);
-        vec3 projCoords = mpos.xyz / mpos.w;
-        projCoords = projCoords * 0.5 + 0.5;
-        projCoords.z -= 0.0001;
-
-        shadow = 0.0;
-        
-        if (dot(a_realnormal, u_sunDir) < 0.0) {
-            for (int x = -1; x <= 1; x++) {
-                for (int y = -1; y <= 1; y++) {
-                    shadow += texture(u_shadows, projCoords.xyz + vec3(
-                        x * (1.0 / u_shadowsRes), 
-                        y * (1.0 / u_shadowsRes), 0.0
-                    ));
-                }
-            }
-            shadow /= 9;
-            shadow = shadow * 0.5 + 0.5;
-        } else {
-            shadow = 0.5;
-        }
-    }
-
-    vec3 fogColor = texture(u_cubemap, a_dir).rgb;
+    float shadow = calc_shadow();
+    vec3 fogColor = texture(u_skybox, a_dir).rgb;
     vec4 texColor = texture(u_texture0, a_texCoord);
     float alpha = a_color.a * texColor.a;
     if (u_alphaClip) {