[update] Improved the shading of CubeProgram.

src/sj/CubeProgram.d

@@ -2,7 +2,8 @@
 module sj.CubeProgram;
 
 import std.conv,
-       std.range.primitives;
+       std.range.primitives,
+       std.string;
 
 import gl4d;
 
@@ -10,7 +11,27 @@ import gl4d;
 class CubeProgram {
  public:
   ///
-  alias Instance = mat4;
+  static struct Material {
+   public:
+    ///
+    vec3 diffuse_color = vec3(1, 1, 1);
+    private float padding0_;
+
+    ///
+    vec3 specular_color = vec3(1, 1, 1);
+    private float padding1_;
+
+    ///
+    vec3 light_color = vec3(1, 1, 1);
+    private float padding2_;
+    ///
+    vec3 light_power = vec3(20, 20, 20);
+    private float padding3_;
+
+    ///
+    vec3 ambient_color = vec3(0.3, 0.3, 0.3);
+    private float padding4_;
+  }
 
   ///
   enum ShaderHeader = "#version 330 core
@@ -18,6 +39,10 @@ class CubeProgram {
 
   ///
   enum VertexShaderSrc = ShaderHeader ~ q{
+    layout(location = 0) uniform mat4 P;
+    layout(location = 1) uniform mat4 V;
+    layout(location = 2) uniform vec3 lightpos;
+
     layout(location = 0) in vec3 vert;
     layout(location = 1) in vec3 normal;
 
@@ -26,29 +51,63 @@ class CubeProgram {
     layout(location = 4) in vec4 m3;
     layout(location = 5) in vec4 m4;
 
+    out vec3  lightdir_;
     out vec3  normal_;
+    out vec3  eyedir_;
+    out float distance_;
 
     void main() {
-      mat4 m = transpose(mat4(m1, m2, m3, m4));
+      mat4 M = transpose(mat4(m1, m2, m3, m4));
 
-      normal_     = (m * vec4(normal, 1)).xyz;
-      gl_Position = m * vec4(vert, 1);
+      vec3 lightpos_camera = (V * vec4(lightpos, 1)).xyz;
+      vec3 vert_camera     = (V * M * vec4(vert, 1)).xyz;
+      vec3 normal_camera   = (V * M * vec4(normal, 0)).xyz;
+
+      eyedir_     = vec3(0, 0, 0) - vert_camera;
+      normal_     = normal_camera;
+      lightdir_   = lightpos_camera + eyedir_;
+      distance_   = length(lightpos_camera - vert_camera);
+
+      gl_Position = P * V * M * vec4(vert, 1);
     }
   };
   ///
   enum FragmentShaderSrc = ShaderHeader ~ q{
-    layout(location = 0) uniform vec3 light_color;
-    layout(location = 1) uniform vec3 light_direction;
-    layout(location = 2) uniform vec3 ambient_color;
+    layout(std140) uniform Material {
+      vec3 diffuse_color;
 
+      vec3 specular_color;
+
+      vec3 light_color;
+      vec3 light_power;
+
+      vec3 ambient_color;
+    } material;
+
+    in vec3  lightdir_;
     in vec3  normal_;
+    in vec3  eyedir_;
+    in float distance_;
 
     out vec4 pixel_;
 
     void main() {
-      float light = dot(normalize(light_direction), normalize(normal_));
-      vec3  color = clamp(light_color * light + ambient_color, 0, 1);
+      vec3 l = normalize(lightdir_);
+      vec3 n = normalize(normal_);
 
+      vec3 e = normalize(eyedir_);
+      vec3 r = reflect(-l, n);
+
+      float diffuse_cos = clamp(dot(l, n), 0, 1);
+      float reflect_cos = clamp(dot(e, r), 0, 1);
+
+      vec3 color_without_ambient =
+        material.diffuse_color  * diffuse_cos +
+        material.specular_color * pow(reflect_cos, 5);
+
+      vec3 color =
+        material.ambient_color +
+        color_without_ambient * material.light_color * material.light_power / pow(distance_, 2);
       pixel_ = vec4(color, 1);
     }
   };
@@ -64,6 +123,18 @@ class CubeProgram {
     program_ = linker.Link();
     program_.Validate();
 
+    material_       = UniformBuffer.Create();
+    material_index_ = gl.GetUniformBlockIndex(program_.id, "Material".toStringz);
+
+    material_.Bind();
+    UniformBufferAllocator material_allocator;
+    with (material_allocator) {
+      data  = null;
+      size  = Material.sizeof;
+      usage = GL_DYNAMIC_DRAW;
+      Allocate(material_);
+    }
+
     vao_       = VertexArray.Create();
     verts_     = ArrayBuffer.Create();
     instances_ = ArrayBuffer.Create();
@@ -156,28 +227,35 @@ class CubeProgram {
     ArrayBufferAllocator instances_allocator;
     with (instances_allocator) {
       data  = null;
-      size  = MaxInstanceCount * Instance.sizeof;
+      size  = MaxInstanceCount * mat4.sizeof;
       usage = GL_DYNAMIC_DRAW;
       Allocate(instances_);
     }
   }
 
   ///
-  void Draw(R)(R cubes, vec3 lcolor, vec3 light, vec3 acolor)
-      if (isInputRange!R && is(ElementType!R == Instance)) {
+  void Draw(R)(R cubes, mat4 projection, mat4 view, vec3 lightpos, Material material)
+      if (isInputRange!R && is(ElementType!R == mat4)) {
+    {
+      auto ptr = material_.MapToWrite!Material();
+      *ptr = material;
+    }
+
+    program_.Use();
+    program_.uniform!0 = projection;
+    program_.uniform!1 = view;
+    program_.uniform!2 = lightpos;
+    material_.BindForUniformBlock(material_index_);
+
     size_t length;
     {
-      auto ptr = instances_.MapToWrite!Instance();
+      auto ptr = instances_.MapToWrite!mat4();
       foreach (const ref c; cubes) {
         assert(length < MaxInstanceCount);
         ptr[length++] = c;
       }
     }
-
-    program_.Use();
-    program_.uniform!0 = lcolor;
-    program_.uniform!1 = light;
-    program_.uniform!2 = acolor;
+    if (length == 0) return;
 
     vao_.Bind();
     gl.DrawArraysInstanced(GL_TRIANGLES, 0, 6*6, length.to!int);
@@ -186,9 +264,13 @@ class CubeProgram {
  private:
   ProgramRef program_;
 
+  UniformBufferRef material_;
+
   VertexArrayRef vao_;
 
   ArrayBufferRef verts_;
 
   ArrayBufferRef instances_;
+
+  const GLuint material_index_;
 }

src/sj/LobbyWorld.d

@@ -14,12 +14,12 @@ import sj.CubeProgram,
 class LobbyWorld {
  public:
   ///
-  enum Perspective = mat4.perspective(-0.5, 0.5, -0.5, 0.5, 0.1, 100);
+  enum Projection = mat4.perspective(1, 1, 60, 0.1, 100);
 
   ///
   this(ProgramSet programs) {
     background_   = new Background(programs.Get!BackgroundProgram);
-    cube_       = programs.Get!CubeProgram;
+    cube_program_ = programs.Get!CubeProgram;
   }
 
   ///
@@ -30,9 +30,9 @@ class LobbyWorld {
 
     gl.Enable(GL_DEPTH_TEST);
     gl.DepthMask(true);
-    cube_.Draw(
-        cubes.map!(x => Perspective * view * x),
-        light_color, light_direction, ambient_color);
+    cube_program_.Draw(
+        cubes.map!"a.Create()",
+        Projection, view.Create(), light_pos, cube_material);
   }
 
   ///
@@ -41,18 +41,16 @@ class LobbyWorld {
   }
 
   ///
-  mat4[] cubes;
+  ModelMatrixFactory!4[] cubes;
   ///
-  mat4 view = mat4.look_at(vec3(0, 0, -1), vec3(0, 0, 0), vec3(0, 1, 0));
+  ViewMatrixFactory view;
   ///
-  vec3 light_color = vec3(1, 1, 1);
+  vec3 light_pos = vec3(0, 10, 0);
   ///
-  vec3 light_direction = vec3(0, 1, 0);
-  ///
-  vec3 ambient_color = vec3(0.1, 0.1, 0.1);
+  CubeProgram.Material cube_material;
 
  private:
   Background background_;
 
-  CubeProgram cube_;
+  CubeProgram cube_program_;
 }