Added scene related things

src/CMakeLists.txt

@@ -1,27 +1,49 @@
 set(HEADERS
         ${HEADERS}
+        ${CMAKE_CURRENT_SOURCE_DIR}/animation_track.h
+        ${CMAKE_CURRENT_SOURCE_DIR}/camera_node.h
         ${CMAKE_CURRENT_SOURCE_DIR}/colour.h
+        ${CMAKE_CURRENT_SOURCE_DIR}/demo_data.h
         ${CMAKE_CURRENT_SOURCE_DIR}/fbo.h
+        ${CMAKE_CURRENT_SOURCE_DIR}/light_node.h
+        ${CMAKE_CURRENT_SOURCE_DIR}/material.h
         ${CMAKE_CURRENT_SOURCE_DIR}/mesh.h
         ${CMAKE_CURRENT_SOURCE_DIR}/mesh_generator.h
+        ${CMAKE_CURRENT_SOURCE_DIR}/mesh_node.h
         ${CMAKE_CURRENT_SOURCE_DIR}/peripherals.h
         ${CMAKE_CURRENT_SOURCE_DIR}/peripherals_glfw.h
+        ${CMAKE_CURRENT_SOURCE_DIR}/scene.h
+        ${CMAKE_CURRENT_SOURCE_DIR}/scene_node.h
+        ${CMAKE_CURRENT_SOURCE_DIR}/scene_tree.h
         ${CMAKE_CURRENT_SOURCE_DIR}/shader.h
+        ${CMAKE_CURRENT_SOURCE_DIR}/shader_constants.h
         ${CMAKE_CURRENT_SOURCE_DIR}/texture.h
         ${CMAKE_CURRENT_SOURCE_DIR}/texture_generator.h
+        ${CMAKE_CURRENT_SOURCE_DIR}/timeline.h
         ${CMAKE_CURRENT_SOURCE_DIR}/timer.h
         PARENT_SCOPE
         )
 
 set(SOURCE
         ${SOURCE}
+        ${CMAKE_CURRENT_SOURCE_DIR}/animation_track.cpp
+        ${CMAKE_CURRENT_SOURCE_DIR}/camera_node.cpp
+        ${CMAKE_CURRENT_SOURCE_DIR}/demo_data.cpp
         ${CMAKE_CURRENT_SOURCE_DIR}/fbo.cpp
+        ${CMAKE_CURRENT_SOURCE_DIR}/light_node.cpp
+        ${CMAKE_CURRENT_SOURCE_DIR}/material.cpp
         ${CMAKE_CURRENT_SOURCE_DIR}/mesh.cpp
         ${CMAKE_CURRENT_SOURCE_DIR}/mesh_generator.cpp
+        ${CMAKE_CURRENT_SOURCE_DIR}/mesh_node.cpp
         ${CMAKE_CURRENT_SOURCE_DIR}/peripherals_glfw.cpp
+        ${CMAKE_CURRENT_SOURCE_DIR}/scene.cpp
+        ${CMAKE_CURRENT_SOURCE_DIR}/scene_node.cpp
+        ${CMAKE_CURRENT_SOURCE_DIR}/scene_tree.cpp
         ${CMAKE_CURRENT_SOURCE_DIR}/shader.cpp
+        ${CMAKE_CURRENT_SOURCE_DIR}/shader_constants.cpp
         ${CMAKE_CURRENT_SOURCE_DIR}/texture.cpp
         ${CMAKE_CURRENT_SOURCE_DIR}/texture_generator.cpp
+        ${CMAKE_CURRENT_SOURCE_DIR}/timeline.cpp
         ${CMAKE_CURRENT_SOURCE_DIR}/timer.cpp
         PARENT_SCOPE
         )

src/animation_track.cpp

@@ -0,0 +1,35 @@
+#include "animation_track.h"
+
+BEGIN_NAMESPACE
+
+void animation_track::add_key(animation_key *key) {
+    keys.push_back(std::shared_ptr<animation_key>(key));
+}
+
+void animation_track::add_controlled_object(void *controlled_object) {
+    controlled_objects.push_back(controlled_object);
+}
+
+void animation_track::set_at(float time) {
+    std::shared_ptr<animation_key> first, second;
+
+    auto i = std::begin(keys);
+
+    while (i != std::end(keys)) {
+        if ((*i)->time >= time) {
+            second = *i;
+            break;
+        } else {
+            first = *i;
+        }
+        ++i;
+    }
+
+    float alpha = (time - first->time) / static_cast<float>(second->time - first->time);
+    animated_value interpolated_value = get_value(first->value, second->value, alpha);
+
+    for (auto o: controlled_objects)
+        control_object(o, interpolated_value);
+}
+
+END_NAMESPACE

src/animation_track.h

@@ -0,0 +1,64 @@
+#pragma once
+
+#include <vector>
+#include <memory>
+#include "defines.h"
+#include "glm/glm.hpp"
+#include "glm/gtc/quaternion.hpp"
+
+BEGIN_NAMESPACE
+
+enum class animated_value_type {
+    integer,
+    decimal,
+    vec3,
+    vec4,
+    quaternion
+};
+
+// sadly we cannot use union here since we have non-POD types
+struct animated_value {
+    int intVal;
+    float floatVal;
+    glm::vec3 vec3Val;
+    glm::vec4 vec4Val;
+    glm::quat quatVal;
+};
+
+struct animation_key {
+    float time;
+    animated_value value;
+
+    static animation_key *vec3Key(float t, glm::vec3 val) {
+        auto *result = new animation_key();
+        result->time = t;
+        result->value.vec3Val = val;
+        return result;
+    }
+
+    static animation_key *floatKey(float t, float val) {
+        auto *result = new animation_key();
+        result->time = t;
+        result->value.floatVal = val;
+        return result;
+    }
+};
+
+class animation_track {
+public:
+    void add_key(animation_key *key);
+    void add_controlled_object(void *controlled_object);
+
+    void set_at(float time);
+
+    virtual animated_value get_value(const animated_value &first,
+                                     const animated_value &second,
+                                     float alpha) = 0;
+    virtual void control_object(void *controlled_object, const animated_value &value) = 0;
+
+    std::vector<std::shared_ptr<animation_key>> keys;
+    std::vector<void *> controlled_objects;
+};
+
+
+END_NAMESPACE

src/camera_node.cpp

@@ -0,0 +1,30 @@
+#include "camera_node.h"
+#include "demo_data.h"
+#include "glm/gtx/quaternion.hpp"
+#include "glm/gtx/transform.hpp"
+#include "glm/gtc/matrix_transform.hpp"
+
+BEGIN_NAMESPACE
+
+camera_node::camera_node() {
+    type = scene_node_type::camera;
+}
+
+void camera_node::calculate_local_transform() {
+    scene_node::calculate_local_transform();
+
+    view_matrix = glm::translate(glm::mat4(1.0f),
+                                 glm::vec3(-position.x, -position.y, -position.z));
+    view_matrix *= glm::lookAt(glm::vec3(position.x, position.y, position.z),
+                               glm::vec3(target.x, target.y, target.z),
+                               glm::vec3(0, 1, 0)
+    );
+
+    projection_matrix = glm::perspective(fov,
+                                         demo_data::screen_width / static_cast<float>(demo_data::screen_height),
+                                         0.001f,
+                                         100000.0f
+    );
+}
+
+END_NAMESPACE

src/camera_node.h

@@ -0,0 +1,18 @@
+#pragma once
+
+#include "scene_node.h"
+
+BEGIN_NAMESPACE
+
+struct camera_node : scene_node {
+    camera_node();
+    void calculate_local_transform() override;
+
+    glm::vec3 target;
+    float roll_angle;
+    float fov;
+    glm::mat4 view_matrix;
+    glm::mat4 projection_matrix;
+};
+
+END_NAMESPACE

src/colour.h

@@ -3,12 +3,17 @@
 #include <cstdint>
 #include "glm/vec4.hpp"
 
-typedef glm::vec4 colour;
+BEGIN_NAMESPACE
+
+using colour = glm::vec4;
 
 inline uint32_t as_int(const glm::vec4 &col) {
-    unsigned char rr = static_cast<unsigned char>(col.r * 255);
-    unsigned char gg = static_cast<unsigned char>(col.g * 255);
-    unsigned char bb = static_cast<unsigned char>(col.b * 255);
-    unsigned char aa = static_cast<unsigned char>(col.a * 255);
-    return rr + (gg << 8) + (bb << 16) + (aa << 24);
+    auto r = static_cast<uint8_t>(col.r * 255);
+    auto g = static_cast<uint8_t>(col.g * 255);
+    auto b = static_cast<uint8_t>(col.b * 255);
+    auto a = static_cast<uint8_t>(col.a * 255);
+
+    return r | g << 8 | b << 16 | a << 24;
 }
+
+END_NAMESPACE

src/defines.h

@@ -4,5 +4,5 @@
 #define BEGIN_NAMESPACE namespace acidrain {
 #define END_NAMESPACE };
 
-static int SCREEN_WIDTH = 800;
-static int SCREEN_HEIGHT = 600;
+//static int SCREEN_WIDTH = 800;
+//static int SCREEN_HEIGHT = 600;

src/demo_data.cpp

@@ -0,0 +1,14 @@
+#include "demo_data.h"
+
+BEGIN_NAMESPACE
+
+std::vector<std::shared_ptr<texture>>   demo_data::textures;
+std::vector<std::shared_ptr<shader>>    demo_data::shaders;
+std::vector<std::shared_ptr<material>>  demo_data::materials;
+std::vector<std::shared_ptr<mesh>>      demo_data::meshes;
+std::vector<std::shared_ptr<fbo>>       demo_data::fbos;
+
+int demo_data::screen_width = 1024;
+int demo_data::screen_height = 768;
+
+END_NAMESPACE

src/demo_data.h

@@ -0,0 +1,23 @@
+#pragma once
+
+#include <vector>
+#include "material.h"
+#include "mesh.h"
+#include "fbo.h"
+
+BEGIN_NAMESPACE
+
+struct demo_data {
+
+    static std::vector<std::shared_ptr<texture>> textures;
+    static std::vector<std::shared_ptr<shader>> shaders;
+    static std::vector<std::shared_ptr<material>> materials;
+    static std::vector<std::shared_ptr<mesh>> meshes;
+    static std::vector<std::shared_ptr<fbo>> fbos;
+
+    // holds the current viewport size at any point in time
+    static int screen_width;
+    static int screen_height;
+};
+
+END_NAMESPACE

src/fbo.cpp

@@ -1,5 +1,6 @@
 #include "fbo.h"
 
+#include "demo_data.h"
 #include <memory>
 
 BEGIN_NAMESPACE
@@ -48,22 +49,22 @@ GLuint fbo::get_depth_buffer_id() const {
 }
 
 void fbo::use() {
-    old_width = SCREEN_WIDTH;
-    old_height = SCREEN_HEIGHT;
+    old_width = demo_data::screen_width;
+    old_height = demo_data::screen_height;
 
-    SCREEN_WIDTH = width;
-    SCREEN_HEIGHT = height;
+    demo_data::screen_height = width;
+    demo_data::screen_height = height;
 
     glBindFramebuffer(GL_FRAMEBUFFER, frame_buffer_id);
     glViewport(0, 0, width, height);
 }
 
-void fbo::unuse() {
+void fbo::unuse() const {
     glBindFramebuffer(GL_FRAMEBUFFER, 0);
     glViewport(0, 0, old_width, old_height);
 
-    SCREEN_WIDTH = old_width;
-    SCREEN_HEIGHT = old_height;
+    demo_data::screen_width = old_width;
+    demo_data::screen_height = old_height;
 }
 
 std::shared_ptr<texture> fbo::get_texture() {

src/fbo.h

@@ -11,7 +11,7 @@ public:
     ~fbo() = default;
 
     void use();
-    void unuse();
+    void unuse() const;
 
     int get_width() const;
     int get_height() const;

src/light_node.cpp

@@ -0,0 +1,53 @@
+#include "light_node.h"
+
+//#define GL_COMPARE_REF_TO_TEXTURE 0x884E
+
+BEGIN_NAMESPACE
+
+light_node::light_node(light_type type_) {
+    type = scene_node_type::light;
+    light_type_ = type_;
+
+    shadow_map_bias_matrix = glm::scale(glm::translate(glm::mat4(1.0f), glm::vec3(0.5f, 0.5f, 0.5f)),
+                                        glm::vec3(0.5f, 0.5f, 0.5f));
+
+    int textures_to_generate = light_type_ == light_type::point ? 6 : 1;
+    for (int i = 0; i < textures_to_generate; i++) {
+        GLuint shadow_map_texture_id;
+
+        // setup the shadowmap texture
+        glGenTextures(1, &shadow_map_texture_id);
+        glBindTexture(GL_TEXTURE_2D, shadow_map_texture_id);
+
+        // set texture parameters
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_COMPARE_MODE, GL_COMPARE_REF_TO_TEXTURE);
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_COMPARE_FUNC, GL_LEQUAL);
+        // TODO: see if we need
+//        glTexParameteri(GL_TEXTURE_2D, GL_DEPTH_TEXTURE_MODE, GL_INTENSITY);
+
+        glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT,
+                     shadow_map_width, shadow_map_width,
+                     0,
+                     GL_DEPTH_COMPONENT,
+                     GL_UNSIGNED_BYTE,
+                     nullptr);
+
+        shadow_map[i] = std::make_shared<texture>(shadow_map_texture_id, shadow_map_width, shadow_map_width);
+    }
+}
+
+void light_node::calculate_local_transform() {
+    if (light_type_ == light_type::spot) {
+        world_to_light_matrix[0] = glm::lookAt(position, spot_target, glm::vec3(0, 1, 0));
+        light_projection_matrix[0] = glm::perspective(90.0f, 1.0f, 0.1f, 100.0f);
+        glm::mat4 lightProjectionAndBiasMatrix = shadow_map_bias_matrix * light_projection_matrix[0];
+        final_shadow_map_matrix[0] = lightProjectionAndBiasMatrix * world_to_light_matrix[0];
+    }
+}
+
+END_NAMESPACE

src/light_node.h

@@ -0,0 +1,42 @@
+#pragma once
+
+#include "scene_node.h"
+#include "texture.h"
+
+BEGIN_NAMESPACE
+
+// http://en.wikipedia.org/wiki/Shading#Lighting
+enum class light_type {
+    directional,
+    point,
+    spot
+};
+
+struct light_node : scene_node {
+    light_node(light_type type);
+
+    void calculate_local_transform() override;
+
+    light_type light_type_;
+
+    glm::vec4 ambient = glm::vec4(0.2, 0.2, 0.2, 1);
+    glm::vec4 diffuse = glm::vec4(0.5, 0.5, 0.5, 1);
+    glm::vec4 specular = glm::vec4(1);
+
+    glm::vec3 attenuation;
+
+    glm::vec3 spot_target;
+    float spot_cutoff;
+    float spot_exponent;
+
+    bool active = true;
+
+    int shadow_map_width = 1024;
+    glm::mat4 light_projection_matrix[6];
+    glm::mat4 world_to_light_matrix[6];
+    glm::mat4 shadow_map_bias_matrix;
+    glm::mat4 final_shadow_map_matrix[6];
+    std::shared_ptr<texture> shadow_map[6];
+};
+
+END_NAMESPACE

src/material.cpp

@@ -0,0 +1,104 @@
+#include "material.h"
+#include "shader_constants.h"
+
+BEGIN_NAMESPACE
+
+GLenum to_gl(const blending_constant &c) {
+    switch (c) {
+        case blending_constant::src_color:
+            return GL_SRC_COLOR;
+        case blending_constant::dst_color:
+            return GL_DST_COLOR;
+        case blending_constant::one:
+            return GL_ONE;
+        case blending_constant::zero:
+            return GL_ZERO;
+        case blending_constant::src_alpha:
+            return GL_SRC_ALPHA;
+        case blending_constant::dst_alpha:
+            return GL_DST_ALPHA;
+        case blending_constant::one_minus_src_alpha:
+            return GL_ONE_MINUS_SRC_ALPHA;
+        case blending_constant::one_minus_dst_alpha:
+            return GL_ONE_MINUS_DST_ALPHA;
+        default:
+            return GL_ZERO;
+    }
+}
+
+void set_material(std::shared_ptr<material> &mat) {
+    // glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
+
+    mat->shader->use();
+
+//        if (material->textures[TextureRole::Diffuse]) {
+//            std::cout << "CAN has diffuse texture!!!!!!!!!11" << std::endl;
+//            int textureUnit = 0;
+//            glActiveTexture(GL_TEXTURE0 + textureUnit);
+//            material->shader->setIntUniform(textureUnit, "diffuseMap");
+//            material->textures[TextureRole::Diffuse]->use();
+//        } else {
+//            std::cout << "Cannot has diffuse texture!!!!!!!!!11" << std::endl;
+//        }
+
+    // int textureUnit = 0;
+    // for (auto& kv : material->textures) {
+    //     glActiveTexture(GL_TEXTURE0 + textureUnit);
+    //     const char* uniformName = ShaderConstantNameResolver::nameFor(kv.first);
+    //     material->shader->setIntUniform(textureUnit, uniformName);
+    //     kv.second->use();
+    //     textureUnit++;
+    // }
+
+    if (mat->transparent) {
+        glEnable(GL_BLEND);
+        glBlendFunc(to_gl(mat->blend_src_fact), to_gl(mat->blend_dst_fact));
+    } else {
+        glDisable(GL_BLEND);
+    }
+
+    if (mat->zbuffer_test)
+        glEnable(GL_DEPTH_TEST);
+    else
+        glDisable(GL_DEPTH_TEST);
+
+    if (mat->zbuffer_write)
+        glDepthMask(GL_TRUE);
+    else
+        glDepthMask(GL_FALSE);
+
+    if (mat->cull_faces) {
+        glEnable(GL_CULL_FACE);
+        glFrontFace(GL_CCW);
+        glCullFace(mat->cull_front_faces ? GL_FRONT : GL_BACK);
+    } else {
+        glDisable(GL_CULL_FACE);
+    }
+}
+
+void unset_material(shared_ptr<material> &mat) {
+    // int textureUnit = 0;
+    // for (auto& kv : material->textures) {
+    //     glActiveTexture(GL_TEXTURE0 + textureUnit);
+    //     const char* uniformName = ShaderConstantNameResolver::nameFor(kv.first);
+    //     material->shader->setIntUniform(textureUnit, uniformName);
+    //     kv.second->unuse();
+    //     textureUnit++;
+    // }
+
+    mat->shader->unuse();
+
+    if (mat->transparent)
+        glDisable(GL_BLEND);
+
+    if (!mat->zbuffer_test)
+        glEnable(GL_DEPTH_TEST);
+
+    if (!mat->zbuffer_write)
+        glDepthMask(GL_TRUE);
+
+    if (mat->cull_faces)
+        glDisable(GL_CULL_FACE);
+}
+
+END_NAMESPACE

src/material.h

@@ -0,0 +1,62 @@
+#pragma once
+
+#include <memory>
+#include <map>
+#include "texture.h"
+#include "shader.h"
+#include "glm/glm.hpp"
+
+BEGIN_NAMESPACE
+
+enum class fill_mode_type {
+    wireframe,
+    solid
+};
+
+enum class blending_constant {
+    src_color,
+    dst_color,
+    one,
+    zero,
+    src_alpha,
+    dst_alpha,
+    one_minus_src_alpha,
+    one_minus_dst_alpha,
+};
+
+enum class texture_role {
+    diffuse,
+    specular,
+    normal,
+    emissive,
+    environment
+};
+
+using texture_map = std::map<texture_role, std::shared_ptr<texture>>;
+
+struct material {
+    glm::vec4 ambient;
+    glm::vec4 diffuse;
+    glm::vec4 specular;
+    float shininess = 1.f;
+
+    bool flat_shaded = true;
+    bool zbuffer_write = true;
+    bool zbuffer_test = true;
+    bool cull_faces = false;
+    bool cull_front_faces = false;
+    bool transparent = false;
+    bool cast_shadows = true;
+
+    blending_constant blend_src_fact = blending_constant::src_alpha;
+    blending_constant blend_dst_fact = blending_constant::one_minus_src_alpha;
+
+    fill_mode_type fill_mode = fill_mode_type::solid;
+    std::shared_ptr<shader> shader;
+    texture_map textures;
+};
+
+void set_material(std::shared_ptr<material> &material);
+void unset_material(std::shared_ptr<material> &material);
+
+END_NAMESPACE

src/mesh_node.cpp

@@ -0,0 +1,9 @@
+#include "mesh_node.h"
+
+BEGIN_NAMESPACE
+
+mesh_node::mesh_node() {
+    type = scene_node_type::mesh;
+}
+
+END_NAMESPACE

src/mesh_node.h

@@ -0,0 +1,16 @@
+#pragma once
+
+#include "material.h"
+#include "mesh.h"
+#include "scene_node.h"
+
+BEGIN_NAMESPACE
+
+struct mesh_node : scene_node {
+    mesh_node();
+
+    std::shared_ptr<mesh> mesh_;
+    std::shared_ptr<material> material_;
+};
+
+END_NAMESPACE

src/scene.cpp

@@ -0,0 +1,12 @@
+#include "scene.h"
+
+#include <memory>
+
+BEGIN_NAMESPACE
+
+scene::scene() {
+    tree = std::make_shared<scene_tree>();
+    animation = std::make_shared<timeline>();
+}
+
+END_NAMESPACE

src/scene.h

@@ -0,0 +1,16 @@
+#pragma once
+
+#include <memory>
+#include "scene_tree.h"
+#include "timeline.h"
+
+BEGIN_NAMESPACE
+
+struct scene {
+    scene();
+
+    std::shared_ptr<scene_tree> tree;
+    std::shared_ptr<timeline> animation;
+};
+
+END_NAMESPACE

src/scene_node.cpp

@@ -0,0 +1,38 @@
+#include "scene_node.h"
+#include "mesh_node.h"
+#include "camera_node.h"
+#include "light_node.h"
+#include "glm/gtc/matrix_transform.hpp"
+#include "glm/gtx/quaternion.hpp"
+
+BEGIN_NAMESPACE
+
+void scene_node::calculate_local_transform() {
+    local_to_parent_space_matrix = glm::translate(glm::mat4(1.0f), position)
+                                   * glm::translate(glm::mat4(1.0f), pivot)
+                                   * glm::toMat4(rotation)
+                                   * glm::translate(glm::mat4(1.0f), -pivot)
+                                   * glm::scale(glm::mat4(1.0f), scale);
+}
+
+void scene_node::apply_parent_transform(const glm::mat4 &parent_transform) {
+    model_to_world_space_matrix = parent_transform * local_to_parent_space_matrix;
+
+    for (auto &child: children)
+        child->apply_parent_transform(model_to_world_space_matrix);
+}
+
+
+mesh_node &scene_node::as_mesh_node() {
+    return *static_cast<mesh_node *>(this);
+}
+
+light_node &scene_node::as_light_node() {
+    return *static_cast<light_node *>(this);
+}
+
+camera_node &scene_node::as_camera_node() {
+    return *static_cast<camera_node *>(this);
+}
+
+END_NAMESPACE

src/scene_node.h

@@ -0,0 +1,49 @@
+#pragma once
+
+#include "defines.h"
+
+#include <vector>
+#include <string>
+#include <memory>
+#include "glm/glm.hpp"
+#include "glm/gtc/quaternion.hpp"
+
+BEGIN_NAMESPACE
+
+enum class scene_node_type {
+    mesh,
+    camera,
+    light
+};
+
+struct mesh_node;
+struct light_node;
+struct camera_node;
+
+struct scene_node {
+    virtual void calculate_local_transform();
+    void apply_parent_transform(const glm::mat4 &parent_transform);
+
+    mesh_node &as_mesh_node();
+    light_node &as_light_node();
+    camera_node &as_camera_node();
+
+    int id;
+    std::string name;
+    scene_node_type type; // We rely on type comparison instead of dynamic casting because comparing types is much faster
+
+    // Helpers to navigate the hierarchy
+    std::shared_ptr<scene_node> parent;
+    std::vector<std::shared_ptr<scene_node>> children;
+
+    // Transform
+    glm::vec3 scale = glm::vec3(1);
+    glm::vec3 position = glm::vec3(0);
+    glm::vec3 pivot = glm::vec3(0);
+    glm::quat rotation;
+
+    glm::mat4 local_to_parent_space_matrix = glm::mat4(1);
+    glm::mat4 model_to_world_space_matrix = glm::mat4(1);
+};
+
+END_NAMESPACE

src/scene_tree.cpp

@@ -0,0 +1,47 @@
+#include "scene_tree.h"
+
+BEGIN_NAMESPACE
+
+std::shared_ptr<scene_node> scene_tree::nodeById(int id) const {
+    for (auto& node : nodes)
+        if (node->id == id)
+            return node;
+
+    return std::shared_ptr<scene_node>(nullptr);
+}
+
+std::shared_ptr<scene_node> scene_tree::nodeByNameAndType(std::string name, scene_node_type type) const {
+    for (auto& node : nodes)
+        if (node->name == name && node->type == type)
+            return node;
+
+    return std::shared_ptr<scene_node>(nullptr);
+}
+
+
+void scene_tree::add(std::shared_ptr<scene_node> node) {
+    add(node, std::shared_ptr<scene_node>(nullptr));
+}
+
+void scene_tree::add(std::shared_ptr<scene_node> node, std::shared_ptr<scene_node> parent) {
+    nodes.push_back(node);
+    node->parent = parent;
+
+    if (parent)
+        parent->children.push_back(node);
+    else
+        rootNodes.push_back(node);
+
+    if (node->type == scene_node_type::light)
+        lights.push_back(node);
+}
+
+void scene_tree::transform() {
+    for (auto& node : nodes)
+        node->calculate_local_transform();
+
+    for (auto& node : rootNodes)
+        node->apply_parent_transform(glm::mat4(1));
+}
+
+END_NAMESPACE

src/scene_tree.h

@@ -0,0 +1,24 @@
+#pragma once
+
+#include "scene_node.h"
+#include <string>
+
+BEGIN_NAMESPACE
+
+class scene_tree {
+public:
+
+    std::shared_ptr<scene_node> nodeById(int id) const;
+    std::shared_ptr<scene_node> nodeByNameAndType(std::string name, scene_node_type type) const;
+
+    void add(std::shared_ptr<scene_node> node);
+    void add(std::shared_ptr<scene_node> node, std::shared_ptr<scene_node> parent);
+
+    void transform();
+
+    std::vector<std::shared_ptr<scene_node>> nodes;
+    std::vector<std::shared_ptr<scene_node>> rootNodes;
+    std::vector<std::shared_ptr<scene_node>> lights;
+};
+
+END_NAMESPACE

src/shader_constants.cpp

@@ -0,0 +1,160 @@
+#include "shader_constants.h"
+#include "glm/gtc/type_ptr.hpp"
+
+BEGIN_NAMESPACE
+
+UniformDescriptor Uniforms::ViewMatrix("vmtx");
+UniformDescriptor Uniforms::ProjectionMatrix("pmtx");
+UniformDescriptor Uniforms::ModelToWorldMatrix("mmtx");
+UniformDescriptor Uniforms::NormalMatrix("nmtx");
+UniformDescriptor Uniforms::WorldToLightMatrix("wlmtx");
+UniformDescriptor Uniforms::LightProjectionMatrix("lpmtx");
+UniformDescriptor Uniforms::ShadowBiasMatrix("sbmtx");
+UniformDescriptor Uniforms::ShadowMatrix("smtx");
+UniformDescriptor Uniforms::DemoPartNormalizedTime("dptimen");
+UniformDescriptor Uniforms::LightPositionInEyeSpace("lPosEye");
+UniformDescriptor Uniforms::MaterialAmbientColor("matAmbientCol");
+UniformDescriptor Uniforms::MaterialDiffuseColor("matDiffuseCol");
+UniformDescriptor Uniforms::MaterialSpecularColor("matSpecularCol");
+UniformDescriptor Uniforms::MaterialShininess("matShininess");
+UniformDescriptor Uniforms::DiffuseMap("diffuseMap");
+UniformDescriptor Uniforms::ShadowMap("shadowMap");
+UniformDescriptor Uniforms::ShadowMap1("shadowMap1");
+UniformDescriptor Uniforms::ShadowMap2("shadowMap2");
+UniformDescriptor Uniforms::ShadowMap3("shadowMap3");
+UniformDescriptor Uniforms::ShadowMap4("shadowMap4");
+UniformDescriptor Uniforms::NumberOfLights("numLights");
+UniformDescriptor Uniforms::LightPosition("light", "position");
+UniformDescriptor Uniforms::LightTarget("light", "target");
+UniformDescriptor Uniforms::LightAmbient("light", "ambient");
+UniformDescriptor Uniforms::LightDiffuse("light", "diffuse");
+UniformDescriptor Uniforms::LightSpecular("light", "specular");
+UniformDescriptor Uniforms::LightSpotCutoff("light", "spotCutoff");
+UniformDescriptor Uniforms::LightSpotExponent("light", "spotExponent");
+UniformDescriptor Uniforms::LightAttenuation("light", "attenuation");
+
+/*
+const char* ShaderConstantNameResolver::nameFor(const ShaderConstantType& type) {
+    switch (type) {
+        case ShaderConstantType::ViewMatrix: return "vmtx";
+        case ShaderConstantType::ProjectionMatrix: return "pmtx";
+        case ShaderConstantType::ModelToWorldMatrix: return "mmtx";
+        case ShaderConstantType::NormalMatrix: return "nmtx";
+        case ShaderConstantType::DemoPartNormalizedTime: return "dptimen";
+        case ShaderConstantType::WorldToLightMatrix: return "wlmtx";
+        case ShaderConstantType::LightProjectionMatrix: return "lpmtx";
+        case ShaderConstantType::ShadowBiasMatrix: return "sbmtx";
+        case ShaderConstantType::ShadowMatrix: return "smtx";
+        case ShaderConstantType::LightPositionInEyeSpace: return "lPosEye";
+        case ShaderConstantType::MaterialAmbientColor: return "matAmbientCol";
+        case ShaderConstantType::MaterialDiffuseColor: return "matDiffuseCol";
+        case ShaderConstantType::MaterialSpecularColor: return "matSpecularCol";
+        case ShaderConstantType::MaterialShininess: return "matShininess";
+        case ShaderConstantType::ShadowMap: return "shadowMap";
+        case ShaderConstantType::NumberOfLights: return "numLights";
+        default: return "";
+    }
+}
+
+const char* ShaderConstantNameResolver::nameFor(const TextureRole& type) {
+    switch (type) {
+        case TextureRole::Diffuse: return "mapDiffuse";
+        case TextureRole::Specular: return "mapSpecular";
+        case TextureRole::Normal: return "mapNormal";
+        // TODO: remove Bump since we have normal map
+        case TextureRole::Bump: return "mapBump";
+        default: return "";
+    }
+}
+
+void ShaderConstants::add(ShaderConstantType type, float value) {
+    ShaderConstantValue val;
+    val.floatVal = value;
+    constants[type] = val;
+}
+
+void ShaderConstants::add(ShaderConstantType type, int value) {
+    ShaderConstantValue val;
+    val.intVal = value;
+    constants[type] = val;
+}
+
+void ShaderConstants::add(ShaderConstantType type, const glm::vec3& value) {
+    ShaderConstantValue val;
+    val.vec3Val = value;
+    constants[type] = val;
+}
+
+void ShaderConstants::add(ShaderConstantType type, const glm::vec4& value) {
+    ShaderConstantValue val;
+    val.vec4Val = value;
+    constants[type] = val;
+}
+
+void ShaderConstants::add(ShaderConstantType type, const glm::mat3& value) {
+    ShaderConstantValue val;
+    val.mat3Val = value;
+    constants[type] = val;
+}
+
+void ShaderConstants::add(ShaderConstantType type, const glm::mat4& value) {
+    ShaderConstantValue val;
+    val.mat4Val = value;
+    constants[type] = val;
+}
+
+
+void ShaderConstants::set(Shader& shader) {
+    for (auto& kv : constants) {
+
+        const char* uniformName = ShaderConstantNameResolver::nameFor(kv.first);
+
+        switch (kv.first) {
+            case ShaderConstantType::NormalMatrix: {
+                shader.setMatrix3Uniform(glm::value_ptr(kv.second.mat3Val), uniformName);
+                break;
+            }
+
+            case ShaderConstantType::ViewMatrix:
+            case ShaderConstantType::ProjectionMatrix:
+            case ShaderConstantType::ModelToWorldMatrix:
+            case ShaderConstantType::WorldToLightMatrix:
+            case ShaderConstantType::LightProjectionMatrix:
+            case ShaderConstantType::ShadowBiasMatrix:
+            case ShaderConstantType::ShadowMatrix: {
+                shader.setMatrix4Uniform(glm::value_ptr(kv.second.mat4Val), uniformName);
+                break;
+            }
+
+            case ShaderConstantType::DemoPartNormalizedTime: {
+                shader.setFloatUniform(kv.second.floatVal, uniformName);
+                break;
+            }
+
+            case ShaderConstantType::MaterialShininess: 
+            case ShaderConstantType::ShadowMap: 
+            case ShaderConstantType::NumberOfLights: {
+                shader.setIntUniform(kv.second.intVal, uniformName);
+                break;
+            }
+
+            case ShaderConstantType::LightPositionInEyeSpace: {
+                shader.setVec3Uniform(glm::value_ptr(kv.second.vec3Val), uniformName);
+                break;
+            }
+
+            case ShaderConstantType::MaterialAmbientColor:
+            case ShaderConstantType::MaterialDiffuseColor:
+            case ShaderConstantType::MaterialSpecularColor: {
+                shader.setVec4Uniform(glm::value_ptr(kv.second.vec4Val), uniformName);
+                break;
+            }
+
+            default:
+                break;
+        }
+    }
+}
+*/
+
+END_NAMESPACE

src/shader_constants.h

@@ -0,0 +1,295 @@
+#pragma once
+
+#include "defines.h"
+#include "shader.h"
+#include "texture.h"
+#include <map>
+#include "material.h"
+#include "glm/glm.hpp"
+#include "glm/gtc/type_ptr.hpp"
+#include <sstream>
+
+BEGIN_NAMESPACE
+
+using namespace std;
+
+struct UniformDescriptor {
+    string structureName;
+    string memberName;
+
+    // TODO: implement memoization of uniform name calculation
+
+    UniformDescriptor(const char *member) {
+        structureName = "";
+        memberName = member;
+    }
+
+    UniformDescriptor(const char *structure, const char *member) {
+        structureName = structure;
+        memberName = member;
+    }
+
+    std::string getName() {
+        if (structureName.empty())
+            return memberName;
+
+        std::stringstream ss(structureName);
+        ss << "." << memberName;
+        return ss.str();
+    }
+
+    std::string getName(int index) {
+        std::stringstream ss;
+        if (structureName.empty()) {
+            ss << memberName << "[" << index << "]";
+        } else {
+            ss << structureName << "[" << index << "]." << memberName;
+        }
+        return ss.str();
+    }
+};
+
+class Uniforms {
+public:
+
+    static UniformDescriptor ViewMatrix;
+    static UniformDescriptor ProjectionMatrix;
+    static UniformDescriptor ModelToWorldMatrix;
+    static UniformDescriptor NormalMatrix;
+    static UniformDescriptor WorldToLightMatrix;
+    static UniformDescriptor LightProjectionMatrix;
+    static UniformDescriptor ShadowBiasMatrix;
+    static UniformDescriptor ShadowMatrix;
+    static UniformDescriptor DemoPartNormalizedTime;
+    static UniformDescriptor LightPositionInEyeSpace;
+    static UniformDescriptor MaterialAmbientColor;
+    static UniformDescriptor MaterialDiffuseColor;
+    static UniformDescriptor MaterialSpecularColor;
+    static UniformDescriptor MaterialShininess;
+    static UniformDescriptor DiffuseMap;
+    static UniformDescriptor ShadowMap;
+    static UniformDescriptor ShadowMap1;
+    static UniformDescriptor ShadowMap2;
+    static UniformDescriptor ShadowMap3;
+    static UniformDescriptor ShadowMap4;
+    static UniformDescriptor NumberOfLights;
+    static UniformDescriptor LightPosition;
+    static UniformDescriptor LightTarget;
+    static UniformDescriptor LightAmbient;
+    static UniformDescriptor LightDiffuse;
+    static UniformDescriptor LightSpecular;
+    static UniformDescriptor LightSpotCutoff;
+    static UniformDescriptor LightSpotExponent;
+    static UniformDescriptor LightAttenuation;
+};
+
+enum class ShaderConstantType {
+    Vec3,
+    Vec4,
+    Integer,
+    Float,
+    Mat3,
+    Mat4
+};
+
+class ShaderConstantValue {
+public:
+
+    ShaderConstantType type;
+
+    glm::vec3 vec3Val;
+    glm::vec4 vec4Val;
+    glm::mat3 mat3Val;
+    glm::mat4 mat4Val;
+    int intVal;
+    float floatVal;
+
+    ShaderConstantValue(const ShaderConstantValue &rhs) {
+        type = rhs.type;
+        vec3Val = rhs.vec3Val;
+        vec4Val = rhs.vec4Val;
+        mat3Val = rhs.mat3Val;
+        mat4Val = rhs.mat4Val;
+        intVal = rhs.intVal;
+        floatVal = rhs.floatVal;
+    }
+
+    ShaderConstantValue(glm::vec3 &value) {
+        vec3Val = value;
+        type = ShaderConstantType::Vec3;
+    }
+
+    ShaderConstantValue(glm::vec4 &value) {
+        vec4Val = value;
+        type = ShaderConstantType::Vec4;
+    }
+
+    ShaderConstantValue(glm::mat3 &value) {
+        mat3Val = value;
+        type = ShaderConstantType::Mat3;
+    }
+
+    ShaderConstantValue(glm::mat4 &value) {
+        mat4Val = value;
+        type = ShaderConstantType::Mat4;
+    }
+
+    ShaderConstantValue(int value) {
+        intVal = value;
+        type = ShaderConstantType::Integer;
+    }
+
+    ShaderConstantValue(float value) {
+        floatVal = value;
+        type = ShaderConstantType::Float;
+    }
+
+    void applyTo(shader &shader, const char *uniformName) {
+        switch (type) {
+            case ShaderConstantType::Vec3:
+                shader.setVec3Uniform(glm::value_ptr(vec3Val), uniformName);
+                break;
+            case ShaderConstantType::Vec4:
+                shader.setVec4Uniform(glm::value_ptr(vec4Val), uniformName);
+                break;
+            case ShaderConstantType::Mat3:
+                shader.setMatrix3Uniform(glm::value_ptr(mat3Val), uniformName);
+                break;
+            case ShaderConstantType::Mat4:
+                shader.setMatrix4Uniform(glm::value_ptr(mat4Val), uniformName);
+                break;
+            case ShaderConstantType::Integer:
+                shader.setIntUniform(intVal, uniformName);
+                break;
+            case ShaderConstantType::Float:
+                shader.setFloatUniform(floatVal, uniformName);
+                break;
+        }
+    }
+};
+
+
+class ShaderConstants {
+public:
+
+    void set(UniformDescriptor descriptor, glm::mat3 value) {
+        constants[descriptor.getName()] = make_shared<ShaderConstantValue>(value);
+    }
+
+    void set(UniformDescriptor descriptor, glm::mat3 value, int index) {
+        constants[descriptor.getName(index)] = make_shared<ShaderConstantValue>(value);
+    }
+
+    void set(UniformDescriptor descriptor, glm::mat4 value) {
+        constants[descriptor.getName()] = make_shared<ShaderConstantValue>(value);
+    }
+
+    void set(UniformDescriptor descriptor, glm::mat4 value, int index) {
+        constants[descriptor.getName(index)] = make_shared<ShaderConstantValue>(value);
+    }
+
+    void set(UniformDescriptor descriptor, glm::vec3 value) {
+        constants[descriptor.getName()] = make_shared<ShaderConstantValue>(value);
+    }
+
+    void set(UniformDescriptor descriptor, glm::vec3 value, int index) {
+        constants[descriptor.getName(index)] = make_shared<ShaderConstantValue>(value);
+    }
+
+    void set(UniformDescriptor descriptor, glm::vec4 value) {
+        constants[descriptor.getName()] = make_shared<ShaderConstantValue>(value);
+    }
+
+    void set(UniformDescriptor descriptor, glm::vec4 value, int index) {
+        constants[descriptor.getName(index)] = make_shared<ShaderConstantValue>(value);
+    }
+
+    void set(UniformDescriptor descriptor, int value) {
+        constants[descriptor.getName()] = make_shared<ShaderConstantValue>(value);
+    }
+
+    void set(UniformDescriptor descriptor, int value, int index) {
+        constants[descriptor.getName(index)] = make_shared<ShaderConstantValue>(value);
+    }
+
+    void set(UniformDescriptor descriptor, float value) {
+        constants[descriptor.getName()] = make_shared<ShaderConstantValue>(value);
+    }
+
+    void set(UniformDescriptor descriptor, float value, int index) {
+        constants[descriptor.getName(index)] = make_shared<ShaderConstantValue>(value);
+    }
+
+    void applyTo(shader &shd) {
+        for (auto &kv: constants)
+            kv.second->applyTo(shd, kv.first.c_str());
+    }
+
+private:
+    std::map<string, std::shared_ptr<ShaderConstantValue>> constants;
+};
+
+/*
+enum class ShaderConstantType {
+    ViewMatrix,
+    ProjectionMatrix,
+    ModelToWorldMatrix,
+    NormalMatrix,
+    WorldToLightMatrix,
+    LightProjectionMatrix,
+    ShadowBiasMatrix,
+    ShadowMatrix,
+    DemoPartNormalizedTime,
+    LightPositionInEyeSpace,
+    MaterialAmbientColor,
+    MaterialDiffuseColor,
+    MaterialSpecularColor,
+    MaterialShininess,
+    ShadowMap,
+    NumberOfLights
+};
+
+class ShaderConstantNameResolver {
+public:
+
+    static const char* nameFor(const ShaderConstantType& type);
+    static const char* nameFor(const TextureRole& type);
+};
+
+union ShaderConstantValue {
+    glm::vec2 vec2Val;
+    glm::vec3 vec3Val;
+    glm::vec4 vec4Val;
+    glm::mat3 mat3Val;
+    glm::mat4 mat4Val;
+    bool boolVal;
+    int intVal;
+    float floatVal;
+
+    ShaderConstantValue() {
+        this->floatVal = 0;
+    };
+
+    ShaderConstantValue(const ShaderConstantValue& lhs) {
+        this->mat4Val = lhs.mat4Val;
+    }
+
+    ShaderConstantValue& operator=(const ShaderConstantValue& lhs) {
+        this->mat4Val = lhs.mat4Val;
+        return *this;
+    };
+};
+
+struct ShaderConstants {
+    std::map<ShaderConstantType, ShaderConstantValue> constants;
+
+    void add(ShaderConstantType type, float value);
+    void add(ShaderConstantType type, int value);
+    void add(ShaderConstantType type, const glm::vec3& value);
+    void add(ShaderConstantType type, const glm::vec4& value);
+    void add(ShaderConstantType type, const glm::mat4& value);
+    void add(ShaderConstantType type, const glm::mat3& value);
+    void set(Shader& shader);
+};
+*/
+END_NAMESPACE

src/timeline.cpp

@@ -0,0 +1,10 @@
+#include "timeline.h"
+
+BEGIN_NAMESPACE
+
+void timeline::setAt(float time) {
+    for (auto &track: tracks)
+        track->set_at(time);
+}
+
+END_NAMESPACE

src/timeline.h

@@ -0,0 +1,12 @@
+#pragma once
+
+#include "animation_track.h"
+
+BEGIN_NAMESPACE
+
+struct timeline {
+    void setAt(float time);
+    std::vector<std::shared_ptr<animation_track>> tracks;
+};
+
+END_NAMESPACE