completed MaterialInstance codes in ShaderGen

inc/hgl/graph/mtl/UBOCommon.h

@@ -10,11 +10,11 @@ constexpr const ShaderBufferSource SBS_ViewportInfo=
     "viewport",
 
     R"(
-mat4 ortho_matrix;
+    mat4 ortho_matrix;
 
-vec2 canvas_resolution;
-vec2 viewport_resolution;
-vec2 inv_viewport_resolution;
+    vec2 canvas_resolution;
+    vec2 viewport_resolution;
+    vec2 inv_viewport_resolution;
 )"
 };
 
@@ -24,22 +24,22 @@ constexpr const ShaderBufferSource SBS_CameraInfo=
     "camera",
 
     R"(
-mat4 projection;
-mat4 inverse_projection;
+    mat4 projection;
+    mat4 inverse_projection;
 
-mat4 view;
-mat4 inverse_view;
+    mat4 view;
+    mat4 inverse_view;
 
-mat4 vp;
-mat4 inverse_vp;
+    mat4 vp;
+    mat4 inverse_vp;
 
-mat4 sky;
+    mat4 sky;
 
-vec3 pos;                   //eye
-vec3 view_line;             //pos-target
-vec3 world_up;
+    vec3 pos;                   //eye
+    vec3 view_line;             //pos-target
+    vec3 world_up;
 
-float znear,zfar;)"
+    float znear,zfar;)"
 };
 
 constexpr const char MaterialInstanceStruct[]="MaterialInstance";
@@ -49,7 +49,8 @@ constexpr const ShaderBufferSource SBS_MaterialInstanceData=
     "MaterialInstanceData",
     "mtl",
 
-    "MaterialInstance mi[256];"
+    R"(
+    MaterialInstance mi[256];)"
 };
 
 constexpr const ShaderBufferSource SBS_JointInfo=