made shader abstract and simplified the static shader

Former-commit-id: 655e3d2

src/prism/common/component/light/ambient_light.cr

@@ -3,6 +3,7 @@ module Prism::Common::Light
   # This is a special type of light that provides a minimum amount of light to the entire scene.
   # For now you always need to have an ambient light otherwise no other light sources will work.
   # That may be a bug that get's fixed later on.
+  # DEPRECATED we'll add ambient lighting in the other lights.
   class AmbientLight < Core::AmbientLight
     getter color
 

src/prism/common/component/light/base_light.cr

@@ -4,10 +4,10 @@ module Prism::Common::Light
   struct BaseLight
     include Core::Shader::Serializable
 
-    @[Core::Shader::Field("color")]
+    @[Core::Shader::Field(name: "color")]
     @color : Vector3f
 
-    @[Core::Shader::Field("intensity")]
+    @[Core::Shader::Field(name: "intensity")]
     @intensity : Float32
 
     getter color, intensity

src/prism/core/shader/program.cr

@@ -37,7 +37,7 @@ module Prism::Core::Shader
   # This `ShaderProgram` contains all of the shader implementation.
   #
   # I probably need to rename these two classes
-  class Program
+  abstract class Program
     # A map of shader programs that have been created.
     # This allows us to re-use programs.
     @@programs = {} of String => CompiledProgram
@@ -106,6 +106,7 @@ module Prism::Core::Shader
     #
     # TODO: let this take in a path to the vertex shader and fragment shader for more flexibility.
     def initialize(@file_name : String, &shader_reader : String -> String)
+      @@programs = {} of String => CompiledProgram
       if @@programs.has_key?(@file_name)
         # Re-use a compiled program so we don't need to compile a new one.
         @resource = @@programs[@file_name]

src/prism/core/shader/static_shader.cr

@@ -1,7 +1,5 @@
 module Prism::Core::Shader
   class StaticShader < Program
-    @@programs = {} of String => CompiledProgram
-
     inline_uniform material, Material
     uniform transformation_matrix, Matrix4f
     uniform projection_matrix, Matrix4f