refactor shaders

res/shaders/entity.glslf

@@ -3,6 +3,8 @@ in vec2 a_texCoord;
 in vec3 a_position;
 in vec3 a_dir;
 in vec3 a_normal;
+in vec3 a_realnormal;
+in vec4 a_modelpos;
 in float a_fog;
 
 layout (location = 0) out vec4 f_color;
@@ -10,20 +12,33 @@ layout (location = 1) out vec4 f_position;
 layout (location = 2) out vec4 f_normal;
 
 uniform sampler2D u_texture0;
-uniform samplerCube u_cubemap;
+uniform samplerCube u_skybox;
 uniform vec3 u_fogColor;
 uniform float u_fogFactor;
 uniform float u_fogCurve;
 uniform bool u_alphaClip;
 
+uniform sampler2DShadow u_shadows;
+uniform vec3 u_sunDir;
+uniform int u_shadowsRes;
+
+uniform bool u_enableShadows;
+uniform mat4 u_shadowsMatrix;
+
+#include <shadows>
+
 void main() {
-    vec3 fogColor = texture(u_cubemap, a_dir).rgb;
+    float shadow = calc_shadow();
+    vec3 fogColor = texture(u_skybox, a_dir).rgb;
     vec4 tex_color = texture(u_texture0, a_texCoord);
     float alpha = a_color.a * tex_color.a;
     // anyway it's any alpha-test alternative required
-    if (alpha < (u_alphaClip ? 0.5f : 0.15f))
+    if (alpha < (u_alphaClip ? 0.5f : 0.15f)) {
         discard;
-    f_color = mix(a_color * tex_color, vec4(fogColor,1.0), a_fog);
+    }
+    f_color = a_color * tex_color;
+    f_color.rgb *= shadow;
+    f_color = mix(f_color, vec4(fogColor, 1.0), a_fog);
     f_color.a = alpha;
     f_position = vec4(a_position, 1.0);
     f_normal = vec4(a_normal, 1.0);