Emissive planet system upgrades / Indexed vertices for planets

core/assets/shaders/planet.vert

@@ -1,6 +1,7 @@
 attribute vec4 a_position;
 attribute vec3 a_normal;
 attribute vec4 a_color;
+attribute vec4 a_emissive;
 
 uniform mat4 u_proj;
 uniform mat4 u_trans;
@@ -8,6 +9,7 @@ uniform vec3 u_lightdir;
 uniform vec3 u_camdir;
 uniform vec3 u_campos;
 uniform vec3 u_ambientColor;
+uniform float u_emissive;
 
 varying vec4 v_col;
 
@@ -20,8 +22,8 @@ void main(){
     vec3 lightReflect = normalize(reflect(a_normal, u_lightdir));
     vec3 vertexEye = normalize(u_campos - (u_trans * a_position).xyz);
 
-    float albedo = a_color.a > 0.5 ? 0.0 : min(a_color.a * 2.0, 1.0);
-    float emissive = a_color.a < 0.5 ? 0.0 : 1.0 - (a_color.a - 0.5) * 2.0;
+    float albedo = 1.0 - a_color.a;
+    float emissive = a_emissive.a * u_emissive;
 
     float specularFactor = dot(vertexEye, lightReflect);
     if(specularFactor > 0.0){
@@ -30,6 +32,6 @@ void main(){
 
 	vec3 norc = (u_ambientColor + specular) * (diffuse + vec3(clamp((dot(a_normal, u_lightdir) + 1.0) / 2.0, 0.0, 1.0)));
 
-	v_col = vec4(a_color.rgb, 1.0) * vec4(mix(norc, vec3(1.0), emissive), 1.0);
+	v_col = vec4(mix(a_color.rgb, a_emissive.rgb, vec3(1.0 - norc)), 1.0) * vec4(mix(norc, vec3(1.0), emissive), 1.0);
     gl_Position = u_proj * u_trans * a_position;
 }