updated SunLightPureColor.mtl

ShaderLibrary/Std3D/BlinnPhong/SunLightPureColor.mtl

@@ -0,0 +1,75 @@
+#Material
+Name        BlinnPhong+HalfLambert shading model only color
+Reference   https://zhuanlan.zhihu.com/p/442023993
+Base        Std3D/BlinnPhong
+
+//某些Require并不真的存在.ubo文件，写成一行一个是为了方便未来改成带路径的
+Require     LocalToWorld
+Require     Camera
+
+define      HAVE_SPECULAR   off     //默认不定义HAVE_SPECULAR
+
+UBO
+{
+    File    Sun.ubo             //文件名
+    Name    sun                 //在代码中的变量名
+    Stage   Vertex,Fragment     //会引用的shader
+}
+
+#MaterialInstance
+
+#VertexInput
+vec3 Normal
+
+#Vertex
+Output
+{
+    vec3 Normal;
+}
+
+Code
+{
+    void main()
+    {
+        gl_Position=GetPosition3D();
+    }
+}
+
+#Fragment
+Output
+{
+    vec4 FragColor;
+}
+
+Code
+{
+    void main()
+    {
+        //将法线归一化
+        vec3 world_normal           =normalize(Input.Normal);
+
+        //对世界坐标下的灯光方法归一化
+        vec3 world_light_direction  =normalize(sun.direction);
+
+        //点乘法线和光照
+        vec3 diffuse                =0.5*dot(world_light_direction,world_normal)+0.5;
+
+        //直接光颜色
+        vec3 direct_color           =sun.diffuse*diffuse*sun.color;
+
+    #ifndef HAVE_SPECULAR
+        FragColor=vec4(direct_color,1.0);
+    #else
+        //归一代视角方向
+        vec3 view_direction     =normalize(camera.pos-world_position);
+
+        //世界坐标下的反射光方向
+        vec3 reflect_direction  =normalize(reflect(-world_light_direction,world_normal));
+
+        //高光
+        vec3 specular           =sun.specular*pow(saturate(dot(reflect_direction,view_direction)),gloss);
+
+        FragColor=vec4(direct_color+specular,1.0);
+    #endif//HAVE_SPECULAR
+    }
+}