Initital shader lighting support

lib/game_objects/light.rb

@@ -1,35 +1,19 @@
 class IMICFPS
   class Light
-    attr_reader :ambient, :diffuse, :specular, :position, :light_id
-    attr_accessor :x, :y, :z, :intensity
-    def initialize(id:, x:,y:,z:,
+    attr_reader :light_id
+    attr_accessor :ambient, :diffuse, :specular, :position, :intensity
+    def initialize(id:,
                    ambient: Vector.new(0.5, 0.5, 0.5, 1),
                    diffuse: Vector.new(1, 0.5, 0, 1), specular: Vector.new(0.2, 0.2, 0.2, 1),
-                   position: Vector.new(x, y, z, 0), intensity: 1)
+                   position: Vector.new(0, 0, 0, 0), intensity: 1
+                  )
       @light_id = id
-      @x,@y,@z = x,y,z
       @intensity = intensity
 
-      self.ambient   = ambient
-      self.diffuse   = diffuse
-      self.specular  = specular
-      self.position  = position
-    end
-
-    def ambient=(color)
-      @ambient = convert(color).pack("f*")
-    end
-
-    def diffuse=(color)
-      @diffuse = convert(color, true).pack("f*")
-    end
-
-    def specular=(color)
-      @specular = convert(color, true).pack("f*")
-    end
-
-    def position=(vertex)
-      @position = convert(vertex).pack("f*")
+      @ambient  = ambient
+      @diffuse  = diffuse
+      @specular = specular
+      @position = position
     end
 
     def draw

lib/map.rb

@@ -29,8 +29,8 @@ class IMICFPS
       add_entity(Player.new(spawnpoint: @map_loader.spawnpoints.sample, manifest: Manifest.new(package: "base", name: "character")))
 
       # TODO: Load lights from MapLoader
-      add_light(Light.new(id: available_light, x: 3, y: -6, z: 6))
-      add_light(Light.new(id: available_light, x: 0, y: 100, z: 0, diffuse: Color.new(1.0, 0.5, 0.1)))
+      add_light(Light.new(id: available_light, position: Vector.new(30, 10.0, 30)))
+      # add_light(Light.new(id: available_light, x: 0, y: 100, z: 0, diffuse: Color.new(1.0, 0.5, 0.1)))
     end
 
     def data

lib/renderer/opengl_renderer.rb

@@ -15,6 +15,7 @@ class IMICFPS
           shader.set_uniform("hasTexture", object.model.has_texture?)
 
           # TODO: Upload and use lights
+          shader.set_uniform("lightPos", lights.first.position)
 
           handleGlError
           draw_model(object.model)

shaders/fragment/default.glsl

@@ -5,6 +5,8 @@ in vec3 outColor;
 in vec4 outNormal;
 in vec3 outUV;
 in float outTextureID;
+in vec3 outLightPos;
+in vec3 outFragPos;
 
 // optimizing compilers are annoying at this stage of my understanding of GLSL
 vec4 lokiVar;
@@ -12,5 +14,13 @@ vec4 lokiVar;
 void main() {
   lokiVar = vec4(outColor, 1.0) + outNormal + vec4(outUV, 1.0) + vec4(outTextureID, 1.0, 1.0, 1.0);
   lokiVar = normalize(lokiVar);
-  gl_FragColor = vec4(outColor, 1.0);
+
+  vec3 lightDir = normalize(outLightPos - outFragPos);
+  vec3 ambient = vec3(0.5, 0.5, 0.35);
+  float diffuse = max(dot(vec3(outNormal), lightDir), -0.2);
+  vec3 specular = vec3(0, 0, 0);
+
+  vec3 result =(ambient + diffuse + specular) * outColor;
+
+  gl_FragColor = vec4(result, 1.0);
 }

shaders/vertex/default.glsl

@@ -12,11 +12,15 @@ out vec4 outNormal;
 out vec3 outUV;
 out float outTextureID;
 out float outHasTexture;
+out vec3 outLightPos;
+out vec3 outFragPos;
 
 uniform mat4 projection;
 uniform mat4 view;
 uniform mat4 model;
 uniform int hasTexture;
+uniform vec3 lightPos;
+
 
 void main() {
   // projection * view * model * position
@@ -26,6 +30,9 @@ void main() {
   outUV    = inUV;
   outTextureID = inTextureID;
   outHasTexture = hasTexture;
+  outLightPos = lightPos;
+
+  outFragPos = vec3(model * vec4(inPosition, 1.0));
 
   gl_Position = projection * view * model * vec4(inPosition, 1.0);
 }