diff --git a/src/graphics/material.nim b/src/graphics/material.nim
index 2f5db52..44e7f7b 100644
--- a/src/graphics/material.nim
+++ b/src/graphics/material.nim
@@ -97,8 +97,24 @@ const VERTEX_SHADER_LIBRARY = dedent """
     }
 """
 
+when defined(myouStoreGLSL):
+    var override_vs_code: Table[string, string]
+    var override_fs_code: Table[string, string]
+    proc setOverrideVSCode*(original, modified: string) =
+        if original == modified:
+            override_vs_code.del original
+        else:
+            override_vs_code[original] = modified
+    proc setOverrideFSCode*(original, modified: string) =
+        if original == modified:
+            override_fs_code.del original
+        else:
+            override_fs_code[original] = modified
+
+
 proc console_error(msg: string) =
-    echo msg
+    for l in msg.split '\n':
+        echo l
 
 func add_line_numbers(s: string, first: int=1):string =
     var lines = s.strip(false, true, {'\n'}).split("\n")
@@ -208,6 +224,7 @@ proc initShader*(self: Shader, engine: MyouEngine, material: Material,
         @[
             &"precision {precision} float;",
             &"precision {precision} int;",
+            &"precision {precision} sampler2DArray;",
             &"precision {precision} sampler2DArrayShadow;",
         ]
     else:
@@ -389,8 +406,9 @@ proc initShader*(self: Shader, engine: MyouEngine, material: Material,
         ).join("\n  ")
         vs = (version_line & extension_lines & vs_head & varyings_uniform_decl & 
             attribute_lines & vertex_shader_library & modifiers_uniforms & varyings_decl & vs_body).join("\n")
-    when not defined(release):
+    when defined(myouStoreGLSL):
         self.vs_code = vs
+        vs = override_vs_code.getOrDefault(vs, vs)
     let vertex_shader = glCreateShader(GL_VERTEX_SHADER)
     defer: glDeleteShader(vertex_shader)
     # TODO: make a pointer array from the unjoined strings, interleaved with "\n"
@@ -400,13 +418,14 @@ proc initShader*(self: Shader, engine: MyouEngine, material: Material,
     glCompileShader(vertex_shader)
     var fragment_shader: GLuint = 0
     defer: glDeleteShader(fragment_shader)
-    template fragment:string = fragment_lines.join("\n")
+    var fragment = fragment_lines.join("\n")
     if has_fragment_shader:
         fragment_shader = glCreateShader(GL_FRAGMENT_SHADER)
-        when not defined(release):
+        when defined(myouStoreGLSL):
             self.fs_code = fragment
-        var fragment2 = fragment.cstring
-        glShaderSource(fragment_shader, 1, cast[cstringArray](addr fragment2), nil)
+            fragment = override_fs_code.getOrDefault(fragment, fragment)
+        var fragmentc = fragment.cstring
+        glShaderSource(fragment_shader, 1, cast[cstringArray](addr fragmentc), nil)
         glCompileShader(fragment_shader)
     let prog = glCreateProgram()
     defer:
@@ -462,15 +481,17 @@ proc initShader*(self: Shader, engine: MyouEngine, material: Material,
         return
     glGetProgramiv(prog, GL_LINK_STATUS, addr success)
     if success == 0:
+        console_error("================")
         let error_msg = dedent &"""Error linking shader of material {material.name}
             {material.varyings}
             {get_program_info_log(prog)}"""
-        console_error("VS =============")
-        console_error(vs)
-        # console_error 'FS ============='
+        # console_error("VS =============")
+        # console_error(vs)
+        # console_error "FS ============="
         # console_error fragment
-        console_error("================")
+        # console_error("================")
         console_error error_msg
+        console_error("================")
         return
 
     self.camera_render_ubo_index = glGetUniformBlockIndex(prog, "CameraRenderUniform")
diff --git a/src/types.nim b/src/types.nim
index 85bd97d..e8eb8e8 100644
--- a/src/types.nim
+++ b/src/types.nim
@@ -584,7 +584,7 @@ type
         shadowmap_location*: GLint
         cubemap_locations*: seq[GLint]
 
-        when not defined(release):
+        when defined(myouStoreGLSL):
             vs_code*, fs_code*: string
 
     # texture.nim