feat: add lights

.gitattributes

@@ -43,7 +43,7 @@
 *.udk lock
 *.upk lock
 # Anything in `/RawContent` dir
-/RowContent/**/* lfs
+/RawContent/**/* lfs
 # Common files
 *.3ds lock
 *.3DS lock
@@ -167,6 +167,8 @@
 *.TAR lfs
 *.tar.gz lfs
 *.TAR.GZ lfs
+*.tga lfs
+*.TGA lfs
 *.tif lfs
 *.TIF lfs
 *.tiff lfs
@@ -210,175 +212,3 @@
 *.DYLIB lfs
 *.pdb lfs
 *.PDB lfs
-*.locres filter=lfs diff=lfs merge=lfs -text
-*.locmeta filter=lfs diff=lfs merge=lfs -text
-*.ico filter=lfs diff=lfs merge=lfs -text
-*.uasset filter=lfs diff=lfs merge=lfs -text
-*.umap filter=lfs diff=lfs merge=lfs -text
-*.udk filter=lfs diff=lfs merge=lfs -text
-*.upk filter=lfs diff=lfs merge=lfs -text
-*.3DS filter=lfs diff=lfs merge=lfs -text
-*.ABC filter=lfs diff=lfs merge=lfs -text
-*.AEP filter=lfs diff=lfs merge=lfs -text
-*.AFDESIGN filter=lfs diff=lfs merge=lfs -text
-*.AFPHOTO filter=lfs diff=lfs merge=lfs -text
-*.AI filter=lfs diff=lfs merge=lfs -text
-*.AIF filter=lfs diff=lfs merge=lfs -text
-*.AVI filter=lfs diff=lfs merge=lfs -text
-*.BANK filter=lfs diff=lfs merge=lfs -text
-*.BGEO filter=lfs diff=lfs merge=lfs -text
-*.BIN filter=lfs diff=lfs merge=lfs -text
-*.BLEND filter=lfs diff=lfs merge=lfs -text
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-*.MP3 filter=lfs diff=lfs merge=lfs -text
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-*.OBJ filter=lfs diff=lfs merge=lfs -text
-*.PDF filter=lfs diff=lfs merge=lfs -text
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-*.STL filter=lfs diff=lfs merge=lfs -text
-*.TAR filter=lfs diff=lfs merge=lfs -text
-*.TAR.GZ filter=lfs diff=lfs merge=lfs -text
-*.TIF filter=lfs diff=lfs merge=lfs -text
-*.TIFF filter=lfs diff=lfs merge=lfs -text
-*.TMP filter=lfs diff=lfs merge=lfs -text
-*.UEXP filter=lfs diff=lfs merge=lfs -text
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-*.aep filter=lfs diff=lfs merge=lfs -text
-*.afdesign filter=lfs diff=lfs merge=lfs -text
-*.afphoto filter=lfs diff=lfs merge=lfs -text
-*.ai filter=lfs diff=lfs merge=lfs -text
-*.aif filter=lfs diff=lfs merge=lfs -text
-*.avi filter=lfs diff=lfs merge=lfs -text
-*.bank filter=lfs diff=lfs merge=lfs -text
-*.bgeo filter=lfs diff=lfs merge=lfs -text
-*.bin filter=lfs diff=lfs merge=lfs -text
-*.blend filter=lfs diff=lfs merge=lfs -text
-*.bmp filter=lfs diff=lfs merge=lfs -text
-*.bpoly filter=lfs diff=lfs merge=lfs -text
-*.c4d filter=lfs diff=lfs merge=lfs -text
-*.doc filter=lfs diff=lfs merge=lfs -text
-*.docx filter=lfs diff=lfs merge=lfs -text
-*.dwg filter=lfs diff=lfs merge=lfs -text
-*.dxf filter=lfs diff=lfs merge=lfs -text
-*.exr filter=lfs diff=lfs merge=lfs -text
-*.fbx filter=lfs diff=lfs merge=lfs -text
-*.geo filter=lfs diff=lfs merge=lfs -text
-*.gi filter=lfs diff=lfs merge=lfs -text
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-*.gif filter=lfs diff=lfs merge=lfs -text
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-*.mp3 filter=lfs diff=lfs merge=lfs -text
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-*.obj filter=lfs diff=lfs merge=lfs -text
-*.pdf filter=lfs diff=lfs merge=lfs -text
-*.pfm filter=lfs diff=lfs merge=lfs -text
-*.pic filter=lfs diff=lfs merge=lfs -text
-*.pmb filter=lfs diff=lfs merge=lfs -text
-*.png filter=lfs diff=lfs merge=lfs -text
-*.poly filter=lfs diff=lfs merge=lfs -text
-*.ppt filter=lfs diff=lfs merge=lfs -text
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-*.profraw filter=lfs diff=lfs merge=lfs -text
-*.prproj filter=lfs diff=lfs merge=lfs -text
-*.psb filter=lfs diff=lfs merge=lfs -text
-*.psd filter=lfs diff=lfs merge=lfs -text
-*.rar filter=lfs diff=lfs merge=lfs -text
-*.rat filter=lfs diff=lfs merge=lfs -text
-*.rib filter=lfs diff=lfs merge=lfs -text
-*.sketch filter=lfs diff=lfs merge=lfs -text
-*.stl filter=lfs diff=lfs merge=lfs -text
-*.tar filter=lfs diff=lfs merge=lfs -text
-*.tar.gz filter=lfs diff=lfs merge=lfs -text
-*.tif filter=lfs diff=lfs merge=lfs -text
-*.tiff filter=lfs diff=lfs merge=lfs -text
-*.tmp filter=lfs diff=lfs merge=lfs -text
-*.uexp filter=lfs diff=lfs merge=lfs -text
-*.usd filter=lfs diff=lfs merge=lfs -text
-*.usdc filter=lfs diff=lfs merge=lfs -text
-*.usdz filter=lfs diff=lfs merge=lfs -text
-*.vdb filter=lfs diff=lfs merge=lfs -text
-*.vox filter=lfs diff=lfs merge=lfs -text
-*.wav filter=lfs diff=lfs merge=lfs -text
-*.xcf filter=lfs diff=lfs merge=lfs -text
-*.xls filter=lfs diff=lfs merge=lfs -text
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-*.a filter=lfs diff=lfs merge=lfs -text
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-*.lib filter=lfs diff=lfs merge=lfs -text
-*.LIB filter=lfs diff=lfs merge=lfs -text
-*.exe filter=lfs diff=lfs merge=lfs -text
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-*.dll filter=lfs diff=lfs merge=lfs -text
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-*.dylib filter=lfs diff=lfs merge=lfs -text
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-*.PDB filter=lfs diff=lfs merge=lfs -text
-*.tga filter=lfs diff=lfs merge=lfs -text

.gitignore

@@ -90,5 +90,9 @@ Mkfile.old
 dkms.conf
 
 # Build directory
-Build/
+build/
-**/Build/
+**/build/
+
+# Asset directory
+!data/
+!data/**

README.md

@@ -1,3 +1,3 @@
-# U-Tad: 3D Programming
+# U-Tad - 3D Programming
 
 "3D Programming" subject assignments from the U-Tad's Master Degree in Video Game Programming.

data/models/box_stack.mtl

@@ -0,0 +1,35 @@
+# Blender MTL File: 'box_stack.blend'
+# Material Count: 3
+
+newmtl mat_bot
+Ns 96.078431
+Ka 0.000000 1.000000 1.000000
+Kd 0.640000 0.640000 0.640000
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.000000
+d 1.000000
+illum 2
+map_Ka top.png
+
+newmtl mat_mid
+Ns 96.078431
+Ka 0.600000 0.600000 0.000000
+Kd 0.640000 0.640000 0.000000
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.000000
+d 1.000000
+illum 2
+map_Ka front.png
+
+newmtl mat_top
+Ns 96.078431
+Ka 1.000000 0.000000 1.000000
+Kd 0.640000 0.640000 0.640000
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.000000
+d 1.000000
+illum 2
+map_Ka top.png

data/models/gunslinger.mtl

@@ -0,0 +1,32 @@
+# 3ds Max Wavefront OBJ Exporter v0.97b - (c)2007 guruware
+# File Created: 21.07.2015 23:00:44
+
+newmtl revolver
+	Ns 30.0000
+	Ni 1.5000
+	d 1.0000
+	Tr 0.0000
+	Tf 1.0000 1.0000 1.0000 
+	illum 2
+	Ka 0.5500 0.5500 0.5500
+	Kd 0.5500 0.5500 0.5500
+	Ks 0.0000 0.0000 0.0000
+	Ke 0.0000 0.0000 0.0000
+	map_Ka revolver_dfs.tga
+	map_Kd revolver_dfs.tga
+	map_bump revolver_nrm.tga
+	bump revolver_nrm.tga
+
+newmtl gunslinger
+	Ns 30.0000
+	Ni 1.5000
+	d 1.0000
+	Tr 0.0000
+	Tf 1.0000 1.0000 1.0000 
+	illum 2
+	Ka 0.5500 0.5500 0.5500
+	Kd 0.5500 0.5500 0.5500
+	Ks 0.0000 0.0000 0.0000
+	Ke 0.0000 0.0000 0.0000
+	map_Ka gunslinger_dfs.tga
+	map_Kd gunslinger_dfs.tga

data/shaders/fragment.glsl

@@ -1,12 +1,68 @@
 uniform int useTexture;
 uniform sampler2D texSampler;
+uniform int numLights;
+uniform vec4 materialColor;
+uniform float shininess;
+uniform vec3 ambientLight;
+
+struct Light {
+	vec4 vector;
+	vec3 color;
+	float intensity;
+	float linear_att;
+};
+
+uniform Light lights[10];
+
 varying vec3 fcolor;
 varying vec2 ftexcoord;
+varying vec3 fnormal;
+varying vec4 fposition;
 
 void main() {
+	vec3 diffuseAccum = vec3(0.0, 0.0, 0.0);
+	vec3 specularAccum = vec3(0.0, 0.0, 0.0);
+
+	if (numLights > 0) {
+		diffuseAccum = ambientLight;
+
+		for (int i = 0; i < 10; i++) {
+			if (i >= numLights) break;
+
+			vec3 N = normalize(fnormal);
+			vec3 L = lights[i].vector.xyz;
+			float attenuation = 1.0;
+
+			if (lights[i].vector.w == 1.0) {
+				L = L - fposition.xyz;
+				float distance = length(L);
+				attenuation = 1.0 / (1.0 + lights[i].linear_att * distance);
+			}
+
+			L = normalize(L);
+			float NdotL = max(dot(N, L), 0.0);
+
+			diffuseAccum += NdotL * lights[i].color * lights[i].intensity * attenuation;
+
+			if (shininess > 0.0 && NdotL > 0.0) {
+				vec3 V = normalize(-fposition.xyz);
+				vec3 H = normalize(L + V);
+				float NdotH = max(dot(N, H), 0.0);
+				specularAccum += pow(NdotH, shininess) * attenuation * lights[i].color * lights[i].intensity;
+			}
+		}
+	}
+
+	vec4 fragmentColor;
 	if (useTexture == 1) {
-		gl_FragColor = texture2D(texSampler, ftexcoord);
+		fragmentColor = texture2D(texSampler, ftexcoord);
 	} else {
-		gl_FragColor = vec4(1.0, 1.0, 1.0, 1.0);
+		fragmentColor = materialColor;
+	}
+
+	if (numLights > 0) {
+		gl_FragColor = vec4(fragmentColor.rgb * diffuseAccum + specularAccum, fragmentColor.a);
+	} else {
+		gl_FragColor = fragmentColor;
 	}
 }

data/shaders/vertex.glsl

@@ -1,12 +1,19 @@
 uniform mat4 mvp;
+uniform mat4 modelView;
+uniform mat4 normalMatrix;
 attribute vec3 vpos;
 attribute vec3 vcolor;
 attribute vec2 vtexcoord;
+attribute vec3 vnormal;
 varying vec3 fcolor;
 varying vec2 ftexcoord;
+varying vec3 fnormal;
+varying vec4 fposition;
 
 void main() {
 	gl_Position = mvp * vec4(vpos, 1);
 	fcolor = vcolor;
 	ftexcoord = vtexcoord;
+	fnormal = vec3(normalMatrix * vec4(vnormal, 0.0));
+	fposition = modelView * vec4(vpos, 1);
 }

src/buffer.cpp

@@ -27,9 +27,8 @@ Buffer::Buffer(const std::vector<Vertex>&   vertices,
 	glBufferData(GL_ELEMENT_ARRAY_BUFFER, indices.size() * sizeof(uint16_t),
 		     indices.data(), GL_STATIC_DRAW);
 
-	glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex),
+	// Note: Vertex attributes are set up by Shader::setup_attribs() during rendering
-			      nullptr);
+	// This allows the shader to dynamically query and set the correct attribute locations
-	glEnableVertexAttribArray(0);
 
 	Logger::info(sstr("Buffer created with ", vertices.size(),
 			  " vertices and ", indices.size(), " indices"));

src/engine.cpp

@@ -9,6 +9,7 @@
 
 #include "buffer.h"
 #include "camera.h"
+#include "light.h"
 #include "logger.h"
 #include "material.h"
 #include "mesh.h"
@@ -19,6 +20,10 @@
 #include "vertex.h"
 #include "world.h"
 
+// Instance variables
+std::shared_ptr<Light> point_light;
+
+// Constants
 constexpr int	 screen_width  = 800;
 constexpr int	 screen_height = 600;
 constexpr double fps_limit     = 1.0 / 60.0;
@@ -111,7 +116,7 @@ void Engine::run()
 		const double now	= glfwGetTime();
 		const double delta_time = now - last_update_time_;
 
-		process_input();
+		process_input(delta_time);
 		update(delta_time);
 
 		if (now - last_frame_time_ >= fps_limit) {
@@ -140,11 +145,12 @@ void Engine::setup()
 
 	// Create world
 	world_ = std::make_unique<World>();
+	world_->set_ambient(glm::vec3(0.2f, 0.2f, 0.2f));
 	Logger::info("World created");
 
-	// Create camera at position (0, 1, 3) with -20 degrees X rotation
+	// Create camera
 	camera_ = std::make_shared<Camera>();
-	camera_->set_position(glm::vec3(0.0f, 1.0f, 3.0f));
+	camera_->set_position(glm::vec3(0.0f, 4.0f, 12.0f));
 	camera_->set_rotation(glm::vec3(glm::radians(-20.0f), 0.0f, 0.0f));
 	camera_->set_projection(
 	    glm::perspective(glm::radians(45.0f),
@@ -156,78 +162,49 @@ void Engine::setup()
 	world_->add_entity(camera_);
 	Logger::info("Camera created and added to world");
 
-	// Load textures
+	// Load the box_stack model
-	auto top_texture   = Texture::load("data/textures/top.png");
+	auto box_stack_mesh = Mesh::load("data/models/box_stack.obj");
-	auto front_texture = Texture::load("data/textures/front.png");
+	if (box_stack_mesh) {
+		auto box_stack_model = std::make_shared<Model>(box_stack_mesh);
+		box_stack_model->set_position(glm::vec3(-2.0f, -1.25f, 0.0f));
+		models_.push_back(box_stack_model);
+		world_->add_entity(box_stack_model);
+		Logger::info("Box stack model loaded and added to world");
+	}
 
-	// Create cube mesh with two buffers
+	// Load the gunslinger model
-	mesh_ = std::make_shared<Mesh>();
+	auto gunslinger_mesh = Mesh::load("data/models/gunslinger.obj");
+	if (gunslinger_mesh) {
+		auto gunslinger_model =
+		    std::make_shared<Model>(gunslinger_mesh);
+		gunslinger_model->set_position(glm::vec3(2.0f, 0.0f, 0.0f));
+		gunslinger_model->set_rotation(
+		    glm::vec3(0.0f, glm::radians(-30.0f), 0.0f));
+		gunslinger_model->set_scale(glm::vec3(0.1f, 0.1f, 0.1f));
+		models_.push_back(gunslinger_model);
+		world_->add_entity(gunslinger_model);
+		Logger::info("Gunslinger model loaded and added to world");
+	}
 
-	// Buffer 1: Top and bottom faces
+	// Create directional light
-	std::vector<Vertex> top_bottom_vertices = {
+	auto directional_light = std::make_shared<Light>();
-	    // Top face (y = 0.5)
+	directional_light->set_type(Light::Type::DIRECTIONAL);
-	    {{-0.5f, 0.5f, -0.5f}, {1.0f, 1.0f, 1.0f}, {0.0f, 0.0f}},
+	directional_light->set_color(glm::vec3(1.0f, 1.0f, 1.0f));
-	    {{0.5f, 0.5f, -0.5f}, {1.0f, 1.0f, 1.0f}, {1.0f, 0.0f}},
+	directional_light->set_intensity(1.0f);
-	    {{0.5f, 0.5f, 0.5f}, {1.0f, 1.0f, 1.0f}, {1.0f, 1.0f}},
+	directional_light->set_position(glm::normalize(
-	    {{-0.5f, 0.5f, 0.5f}, {1.0f, 1.0f, 1.0f}, {0.0f, 1.0f}},
+	    glm::vec3(1.0f, 1.0f, 1.0f))); // Use position as direction
-	    // Bottom face (y = -0.5)
+	world_->add_entity(directional_light);
-	    {{-0.5f, -0.5f, -0.5f}, {1.0f, 1.0f, 1.0f}, {0.0f, 0.0f}},
+	Logger::info("Directional light created and added to world");
-	    {{0.5f, -0.5f, -0.5f}, {1.0f, 1.0f, 1.0f}, {1.0f, 0.0f}},
-	    {{0.5f, -0.5f, 0.5f}, {1.0f, 1.0f, 1.0f}, {1.0f, 1.0f}},
-	    {{-0.5f, -0.5f, 0.5f}, {1.0f, 1.0f, 1.0f}, {0.0f, 1.0f}}};
-	std::vector<uint16_t> top_bottom_indices = {// Top face
-						    0, 1, 2, 0, 2, 3,
-						    // Bottom face
-						    4, 6, 5, 4, 7, 6};
 
-	auto top_bottom_buffer =
+	// Create point light
-	    std::make_shared<Buffer>(top_bottom_vertices, top_bottom_indices);
+	point_light = std::make_shared<Light>();
-	Material top_material(top_texture);
+	point_light->set_type(Light::Type::POINT);
-	mesh_->add_buffer(top_bottom_buffer, top_material);
+	point_light->set_color(glm::vec3(1.0f, 0.0f, 0.0f));
-
+	point_light->set_intensity(2.0f);
-	// Buffer 2: Front, back, left, right faces
+	point_light->set_linear_attenuation(0.2f);
-	std::vector<Vertex> side_vertices = {
+	point_light->set_position(glm::vec3(5.0f, 0.0f, 0.0f));
-	    // Front face (z = 0.5)
+	world_->add_entity(point_light);
-	    {{-0.5f, -0.5f, 0.5f}, {1.0f, 1.0f, 1.0f}, {0.0f, 0.0f}},
+	Logger::info("Point light created and added to world");
-	    {{0.5f, -0.5f, 0.5f}, {1.0f, 1.0f, 1.0f}, {1.0f, 0.0f}},
-	    {{0.5f, 0.5f, 0.5f}, {1.0f, 1.0f, 1.0f}, {1.0f, 1.0f}},
-	    {{-0.5f, 0.5f, 0.5f}, {1.0f, 1.0f, 1.0f}, {0.0f, 1.0f}},
-	    // Back face (z = -0.5)
-	    {{-0.5f, -0.5f, -0.5f}, {1.0f, 1.0f, 1.0f}, {1.0f, 0.0f}},
-	    {{-0.5f, 0.5f, -0.5f}, {1.0f, 1.0f, 1.0f}, {1.0f, 1.0f}},
-	    {{0.5f, 0.5f, -0.5f}, {1.0f, 1.0f, 1.0f}, {0.0f, 1.0f}},
-	    {{0.5f, -0.5f, -0.5f}, {1.0f, 1.0f, 1.0f}, {0.0f, 0.0f}},
-	    // Left face (x = -0.5)
-	    {{-0.5f, -0.5f, -0.5f}, {1.0f, 1.0f, 1.0f}, {0.0f, 0.0f}},
-	    {{-0.5f, -0.5f, 0.5f}, {1.0f, 1.0f, 1.0f}, {1.0f, 0.0f}},
-	    {{-0.5f, 0.5f, 0.5f}, {1.0f, 1.0f, 1.0f}, {1.0f, 1.0f}},
-	    {{-0.5f, 0.5f, -0.5f}, {1.0f, 1.0f, 1.0f}, {0.0f, 1.0f}},
-	    // Right face (x = 0.5)
-	    {{0.5f, -0.5f, -0.5f}, {1.0f, 1.0f, 1.0f}, {1.0f, 0.0f}},
-	    {{0.5f, 0.5f, -0.5f}, {1.0f, 1.0f, 1.0f}, {1.0f, 1.0f}},
-	    {{0.5f, 0.5f, 0.5f}, {1.0f, 1.0f, 1.0f}, {0.0f, 1.0f}},
-	    {{0.5f, -0.5f, 0.5f}, {1.0f, 1.0f, 1.0f}, {0.0f, 0.0f}}};
-	std::vector<uint16_t> side_indices = {// Front face
-					      0, 1, 2, 0, 2, 3,
-					      // Back face
-					      4, 5, 6, 4, 6, 7,
-					      // Left face
-					      8, 9, 10, 8, 10, 11,
-					      // Right face
-					      12, 13, 14, 12, 14, 15};
-
-	auto side_buffer =
-	    std::make_shared<Buffer>(side_vertices, side_indices);
-	Material side_material(front_texture);
-	mesh_->add_buffer(side_buffer, side_material);
-
-	Logger::info("Cube mesh created with two buffers");
-
-	// Create model at origin
-	auto model = std::make_shared<Model>(mesh_);
-	model->set_position(glm::vec3(0.0f, 0.0f, 0.0f));
-	models_.push_back(model);
-	world_->add_entity(model);
 
 	Logger::info("Scene setup complete");
 }
@@ -238,20 +215,52 @@ void Engine::start()
 	// Can be used for initialization that needs the scene to be ready
 }
 
-void Engine::process_input()
+void Engine::process_input(const double delta_time)
 {
 	glfwPollEvents();
+
+	if (!camera_) {
+		return;
+	}
+
+	constexpr float camera_speed = 7.5f;
+
+	glm::vec3 forward = glm::vec3(0.0f, 0.0f, -1.0f);
+	glm::vec3 right	  = glm::vec3(1.0f, 0.0f, 0.0f);
+
+	glm::mat4 rotation = glm::mat4(1.0f);
+	rotation	   = glm::rotate(rotation, camera_->rotation().y,
+					 glm::vec3(0.0f, 1.0f, 0.0f));
+	rotation	   = glm::rotate(rotation, camera_->rotation().x,
+					 glm::vec3(1.0f, 0.0f, 0.0f));
+	forward		   = glm::vec3(rotation * glm::vec4(forward, 0.0f));
+	right		   = glm::vec3(rotation * glm::vec4(right, 0.0f));
+
+	const float movement = camera_speed * static_cast<float>(delta_time);
+	if (glfwGetKey(window_, GLFW_KEY_UP) == GLFW_PRESS) {
+		camera_->set_position(camera_->position() + forward * movement);
+	}
+	if (glfwGetKey(window_, GLFW_KEY_DOWN) == GLFW_PRESS) {
+		camera_->set_position(camera_->position() - forward * movement);
+	}
+	if (glfwGetKey(window_, GLFW_KEY_LEFT) == GLFW_PRESS) {
+		camera_->set_position(camera_->position() - right * movement);
+	}
+	if (glfwGetKey(window_, GLFW_KEY_RIGHT) == GLFW_PRESS) {
+		camera_->set_position(camera_->position() + right * movement);
+	}
 }
 
 void Engine::update(const double delta_time)
 {
-	// Update angle for rotation
+	// Update angle for orbiting light
-	angle_ += 32.0 * delta_time;
+	angle_ += delta_time;
 
-	// Update rotation for all models
+	// Make point light orbit around the model
-	for (auto& model : models_) {
+	if (point_light) {
-		model->set_rotation(glm::vec3(
+		constexpr float radius = 7.5f;
-		    0.0f, glm::radians(static_cast<float>(angle_)), 0.0f));
+		point_light->set_position(glm::vec3(radius * cos(angle_), 2.0f,
+						    radius * sin(angle_)));
 	}
 
 	// Update world

src/engine.h

@@ -25,7 +25,7 @@ private:
 	// Lifecycle methods
 	void setup();
 	void start();
-	void process_input();
+	void process_input(const double delta_time);
 	void update(const double delta_time);
 	void render();
 

src/light.cpp

@@ -0,0 +1,56 @@
+#include "light.h"
+
+#include "../lib/glm/gtc/matrix_transform.hpp"
+
+#include "shader.h"
+#include "state.h"
+
+Light::Light()
+    : Entity()
+    , type_(Type::DIRECTIONAL)
+    , color_(1.0f, 1.0f, 1.0f)
+    , intensity_(1.0f)
+    , linear_attenuation_(0.0f)
+{
+}
+
+void Light::prepare(int index, std::shared_ptr<Shader>& shader) const
+{
+	if (!shader)
+		return;
+
+	// Build uniform names for this light index
+	std::string light_vector =
+	    "lights[" + std::to_string(index) + "].vector";
+	std::string light_color = "lights[" + std::to_string(index) + "].color";
+	std::string light_intensity =
+	    "lights[" + std::to_string(index) + "].intensity";
+	std::string light_linear_att =
+	    "lights[" + std::to_string(index) + "].linear_att";
+
+	// Get uniform locations
+	int vector_loc	   = shader->uniform_location(light_vector.c_str());
+	int color_loc	   = shader->uniform_location(light_color.c_str());
+	int intensity_loc  = shader->uniform_location(light_intensity.c_str());
+	int linear_att_loc = shader->uniform_location(light_linear_att.c_str());
+
+	// Calculate light vector in view space
+	glm::vec4 light_vector_view;
+	if (type_ == Type::DIRECTIONAL) {
+		// For directional lights, w = 0
+		glm::vec3 direction =
+		    glm::normalize(position_); // Use position as direction
+		light_vector_view =
+		    state::view_matrix * glm::vec4(direction, 0.0f);
+	} else {
+		// For point lights, w = 1
+		light_vector_view =
+		    state::view_matrix * glm::vec4(position_, 1.0f);
+	}
+
+	// Set uniforms
+	Shader::set_vec4(vector_loc, light_vector_view);
+	Shader::set_vec3(color_loc, color_);
+	Shader::set_float(intensity_loc, intensity_);
+	Shader::set_float(linear_att_loc, linear_attenuation_);
+}

src/light.h

@@ -0,0 +1,67 @@
+#ifndef LIGHT_H_
+#define LIGHT_H_
+
+#include <memory>
+
+#include "../lib/glm/glm.hpp"
+
+#include "entity.h"
+
+class Shader;
+
+class Light : public Entity {
+public:
+	enum class Type {
+		DIRECTIONAL,
+		POINT
+	};
+
+	Light();
+	~Light() override = default;
+
+	[[nodiscard]] Type type() const
+	{
+		return type_;
+	}
+	void set_type(Type type)
+	{
+		type_ = type;
+	}
+
+	[[nodiscard]] const glm::vec3& color() const
+	{
+		return color_;
+	}
+	void set_color(const glm::vec3& color)
+	{
+		color_ = color;
+	}
+
+	[[nodiscard]] float intensity() const
+	{
+		return intensity_;
+	}
+	void set_intensity(float intensity)
+	{
+		intensity_ = intensity;
+	}
+
+	[[nodiscard]] float linear_attenuation() const
+	{
+		return linear_attenuation_;
+	}
+	void set_linear_attenuation(float att)
+	{
+		linear_attenuation_ = att;
+	}
+
+	void prepare(int index, std::shared_ptr<Shader>& shader) const;
+
+private:
+	Type	  type_;
+	glm::vec3 color_;
+	float	  intensity_;
+	float	  linear_attenuation_;
+};
+
+#endif // LIGHT_H_

src/main.cpp

@@ -1,9 +1,12 @@
-/*#ifdef _MSC_VER
+// #ifdef _MSC_VER
-#pragma comment(linker, "/SUBSYSTEM:windows /ENTRY:mainCRTStartup")
+// #pragma comment(linker, "/SUBSYSTEM:windows /ENTRY:mainCRTStartup")
-#endif*/
+// #endif
 
 #define STB_IMAGE_IMPLEMENTATION
-#include "../lib/stb/stb_image.h"
+#include "../lib/stb_image.h"
+
+#define TINYOBJLOADER_IMPLEMENTATION
+#include "../lib/tiny_obj_loader.h"
 
 #include "engine.h"
 
@@ -15,5 +18,9 @@ int main()
 	engine.run();
 	engine.destroy();
 
+	// _CrtSetReportFile(_CRT_WARN, _CRTDBG_FILE_STDOUT);
+	// _CrtSetReportMode(_CRT_WARN, _CRTDBG_MODE_FILE);
+	// _CrtDumpMemoryLeaks();
+
 	return 0;
 }

src/material.cpp

@@ -1,14 +1,19 @@
 #include "material.h"
 
 #include "../lib/glm/glm.hpp"
+#include "../lib/glm/gtc/matrix_transform.hpp"
 
+#include "light.h"
 #include "shader.h"
 #include "state.h"
 #include "texture.h"
 
 Material::Material(const std::shared_ptr<Texture>& tex,
 		   const std::shared_ptr<Shader>&  shader)
-    : shader_(shader), texture_(tex)
+    : shader_(shader)
+    , texture_(tex)
+    , color_(1.0f, 1.0f, 1.0f, 1.0f)
+    , shininess_(0)
 {
 }
 
@@ -42,6 +47,39 @@ void Material::prepare()
 	const int mvp_loc = active_shader->uniform_location("mvp");
 	Shader::set_mat4(mvp_loc, mvp);
 
+	// Set ModelView matrix
+	const glm::mat4 model_view = state::view_matrix * state::model_matrix;
+	const int model_view_loc = active_shader->uniform_location("modelView");
+	Shader::set_mat4(model_view_loc, model_view);
+
+	// Set Normal matrix (transpose of inverse of ModelView)
+	const glm::mat4 normal_matrix =
+	    glm::transpose(glm::inverse(model_view));
+	const int normal_matrix_loc =
+	    active_shader->uniform_location("normalMatrix");
+	Shader::set_mat4(normal_matrix_loc, normal_matrix);
+
+	// Set material properties
+	const int material_color_loc =
+	    active_shader->uniform_location("materialColor");
+	Shader::set_vec4(material_color_loc, color_);
+
+	const int shininess_loc = active_shader->uniform_location("shininess");
+	Shader::set_float(shininess_loc, static_cast<float>(shininess_));
+
+	// Set ambient light
+	const int ambient_loc = active_shader->uniform_location("ambientLight");
+	Shader::set_vec3(ambient_loc, state::ambient);
+
+	// Set number of lights
+	const int num_lights_loc = active_shader->uniform_location("numLights");
+	Shader::set_int(num_lights_loc, static_cast<int>(state::lights.size()));
+
+	// Prepare each light
+	for (size_t i = 0; i < state::lights.size(); ++i) {
+		state::lights[i]->prepare(static_cast<int>(i), active_shader);
+	}
+
 	// Set texture-related uniforms
 	const int use_texture_loc =
 	    active_shader->uniform_location("useTexture");

src/material.h

@@ -3,6 +3,8 @@
 
 #include <memory>
 
+#include "../lib/glm/glm.hpp"
+
 class Shader;
 class Texture;
 
@@ -25,11 +27,31 @@ public:
 		texture_ = tex;
 	}
 
+	[[nodiscard]] const glm::vec4& color() const
+	{
+		return color_;
+	}
+	void set_color(const glm::vec4& color)
+	{
+		color_ = color;
+	}
+
+	[[nodiscard]] uint8_t shininess() const
+	{
+		return shininess_;
+	}
+	void set_shininess(uint8_t shininess)
+	{
+		shininess_ = shininess;
+	}
+
 	void prepare();
 
 private:
 	std::shared_ptr<Shader>	 shader_;
 	std::shared_ptr<Texture> texture_;
+	glm::vec4		 color_;
+	uint8_t			 shininess_;
 };
 
 #endif // MATERIAL_H_

src/mesh.cpp

@@ -1,15 +1,197 @@
 #include "mesh.h"
 
+#include <filesystem>
+#include <string>
+#include <unordered_map>
+
+#include "../lib/tiny_obj_loader.h"
+
 #include "buffer.h"
+#include "logger.h"
 #include "material.h"
+#include "shader.h"
+#include "state.h"
+#include "texture.h"
+#include "vertex.h"
+
+// Helper structures and functions for OBJ loading
+namespace {
+
+struct LoadContext {
+	std::string						  base_dir;
+	std::unordered_map<std::string, std::shared_ptr<Texture>> texture_cache;
+	const std::vector<tinyobj::material_t>*			  materials;
+	const std::shared_ptr<Shader>&				  shader;
+};
+
+Vertex create_vertex(const tinyobj::attrib_t& attrib,
+		     const tinyobj::index_t&  idx)
+{
+	Vertex vertex;
+
+	// Position
+	if (idx.vertex_index >= 0) {
+		vertex.position.x = attrib.vertices[3 * idx.vertex_index + 0];
+		vertex.position.y = attrib.vertices[3 * idx.vertex_index + 1];
+		vertex.position.z = attrib.vertices[3 * idx.vertex_index + 2];
+	}
+
+	// Color (default to white)
+	vertex.color = glm::vec3(1.0f, 1.0f, 1.0f);
+
+	// Texture coordinates
+	vertex.tex_coord = glm::vec2(0.0f, 0.0f);
+	if (idx.texcoord_index >= 0) {
+		vertex.tex_coord.x = attrib.texcoords[2 * idx.texcoord_index + 0];
+		vertex.tex_coord.y = attrib.texcoords[2 * idx.texcoord_index + 1];
+	}
+
+	// Normal
+	vertex.normal = glm::vec3(0.0f, 0.0f, 1.0f);
+	if (idx.normal_index >= 0) {
+		vertex.normal.x = attrib.normals[3 * idx.normal_index + 0];
+		vertex.normal.y = attrib.normals[3 * idx.normal_index + 1];
+		vertex.normal.z = attrib.normals[3 * idx.normal_index + 2];
+	}
+
+	return vertex;
+}
+
+void process_shape(const tinyobj::shape_t&   shape,
+		   const tinyobj::attrib_t& attrib,
+		   std::vector<Vertex>&	    out_vertices,
+		   std::vector<uint16_t>&   out_indices)
+{
+	// Process all indices - create one vertex per index
+	for (size_t i = 0; i < shape.mesh.indices.size(); ++i) {
+		const tinyobj::index_t& idx = shape.mesh.indices[i];
+		Vertex			vertex	= create_vertex(attrib, idx);
+
+		out_vertices.push_back(vertex);
+		out_indices.push_back(
+		    static_cast<uint16_t>(out_vertices.size() - 1));
+	}
+}
+
+std::shared_ptr<Texture> load_material_texture(int	    material_id,
+					       LoadContext& context)
+{
+	if (material_id < 0
+	    || material_id >= static_cast<int>(context.materials->size())) {
+		return nullptr;
+	}
+
+	const auto& mat		 = (*context.materials)[material_id];
+	std::string texture_name = mat.diffuse_texname;
+
+	// Try ambient texture if diffuse is not available
+	if (texture_name.empty()) {
+		texture_name = mat.ambient_texname;
+	}
+
+	if (texture_name.empty()) {
+		return nullptr;
+	}
+
+	// Check cache first
+	auto it = context.texture_cache.find(texture_name);
+	if (it != context.texture_cache.end()) {
+		return it->second;
+	}
+
+	// Load texture
+	std::string texture_path = context.base_dir + texture_name;
+	auto	    texture	 = Texture::load(texture_path.c_str());
+
+	if (texture) {
+		context.texture_cache[texture_name] = texture;
+		Logger::info(sstr("Loaded texture: ", texture_path));
+	} else {
+		Logger::warn(sstr("Failed to load texture: ", texture_path));
+	}
+
+	return texture;
+}
+
+void create_buffer_for_shape(const tinyobj::shape_t&   shape,
+			     const std::vector<Vertex>&	   vertices,
+			     const std::vector<uint16_t>& indices,
+			     LoadContext&		   context,
+			     std::shared_ptr<Mesh>&	   mesh)
+{
+	auto buffer = std::make_shared<Buffer>(vertices, indices);
+
+	// Use first material ID from the shape
+	int material_id = -1;
+	if (!shape.mesh.material_ids.empty() && shape.mesh.material_ids[0] >= 0) {
+		material_id = shape.mesh.material_ids[0];
+	}
+
+	auto texture = load_material_texture(material_id, context);
+	auto material_shader =
+	    context.shader ? context.shader : state::default_shader;
+
+	Material mat(texture, material_shader);
+	mesh->add_buffer(buffer, mat);
+}
+
+} // namespace
 
 void Mesh::add_buffer(const std::shared_ptr<Buffer>& buffer,
-		      const Material& material)
+		      const Material&		     material)
 {
 	buffers_.push_back(buffer);
 	materials_.push_back(material);
 }
 
+std::shared_ptr<Mesh> Mesh::load(const char*			filename,
+				 const std::shared_ptr<Shader>& shader)
+{
+	Logger::info(sstr("Loading mesh from: ", filename));
+
+	// Load OBJ file
+	tinyobj::attrib_t		 attrib;
+	std::vector<tinyobj::shape_t>	 shapes;
+	std::vector<tinyobj::material_t> materials;
+	std::string			 err;
+
+	std::filesystem::path obj_path(filename);
+	std::string	      base_dir = obj_path.parent_path().string();
+	if (!base_dir.empty()) {
+		base_dir += "/";
+	}
+
+	if (!tinyobj::LoadObj(&attrib, &shapes, &materials, &err, filename,
+			      base_dir.c_str())) {
+		Logger::error(
+		    sstr("Failed to load OBJ file: ", filename, " - ", err));
+		return nullptr;
+	}
+
+	if (!err.empty()) {
+		Logger::warn(sstr("TinyObjLoader warning: ", err));
+	}
+
+	// Setup load context
+	LoadContext context{base_dir, {}, &materials, shader};
+
+	// Process each shape
+	auto mesh = std::make_shared<Mesh>();
+	for (const auto& shape : shapes) {
+		Logger::info(sstr("Processing shape: ", shape.name));
+
+		std::vector<Vertex>   vertices;
+		std::vector<uint16_t> indices;
+
+		process_shape(shape, attrib, vertices, indices);
+		create_buffer_for_shape(shape, vertices, indices, context, mesh);
+	}
+
+	Logger::info(sstr("Mesh loaded successfully with ", mesh->num_buffers(),
+			  " buffers"));
+	return mesh;
+}
+
 void Mesh::draw()
 {
 	// Draw each buffer with its material

src/mesh.h

@@ -7,12 +7,17 @@
 #include "material.h"
 
 class Buffer;
+class Shader;
 
 class Mesh {
 public:
 	Mesh()	= default;
 	~Mesh() = default;
 
+	static std::shared_ptr<Mesh>
+	load(const char*		    filename,
+	     const std::shared_ptr<Shader>& shader = nullptr);
+
 	void add_buffer(const std::shared_ptr<Buffer>& buffer,
 			const Material&		       material);
 

src/shader.cpp

@@ -73,6 +73,14 @@ void Shader::setup_attribs() const
 		    loc, 2, GL_FLOAT, GL_FALSE, sizeof(Vertex),
 		    reinterpret_cast<const void*>(offsetof(Vertex, tex_coord)));
 	}
+
+	loc = glGetAttribLocation(program_id_, "vnormal");
+	if (loc != -1) {
+		glEnableVertexAttribArray(loc);
+		glVertexAttribPointer(
+		    loc, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex),
+		    reinterpret_cast<const void*>(offsetof(Vertex, normal)));
+	}
 }
 
 int Shader::uniform_location(const char* key) const

src/state.h

@@ -2,16 +2,20 @@
 #define STATE_H_
 
 #include <memory>
+#include <vector>
 #include "../lib/glm/glm.hpp"
 
 class Shader;
+class Light;
 
 namespace state {
 
-inline std::shared_ptr<Shader> default_shader	 = nullptr;
+inline std::shared_ptr<Shader>		   default_shader    = nullptr;
-inline glm::mat4	       projection_matrix = glm::mat4(1.0f);
+inline glm::mat4			   projection_matrix = glm::mat4(1.0f);
-inline glm::mat4	       view_matrix	 = glm::mat4(1.0f);
+inline glm::mat4			   view_matrix	     = glm::mat4(1.0f);
-inline glm::mat4	       model_matrix	 = glm::mat4(1.0f);
+inline glm::mat4			   model_matrix	     = glm::mat4(1.0f);
+inline std::vector<std::shared_ptr<Light>> lights;
+inline glm::vec3 ambient = glm::vec3(0.0f, 0.0f, 0.0f);
 
 } // namespace state
 

src/texture.cpp

@@ -4,7 +4,7 @@
 
 #include "../lib/glew/GL/glew.h"
 #include "../lib/glfw/glfw3.h"
-#include "../lib/stb/stb_image.h"
+#include "../lib/stb_image.h"
 
 #include "logger.h"
 

src/vertex.h

@@ -7,6 +7,7 @@ struct Vertex {
 	glm::vec3 position{0.0f, 0.0f, 0.0f};
 	glm::vec3 color{0.0f, 0.0f, 0.0f};
 	glm::vec2 tex_coord{0.0f, 0.0f};
+	glm::vec3 normal{0.0f, 0.0f, 0.0f};
 };
 
 #endif // VERTEX_H_

src/world.cpp

@@ -4,7 +4,9 @@
 
 #include "camera.h"
 #include "entity.h"
+#include "light.h"
 #include "logger.h"
+#include "state.h"
 
 void World::add_entity(const std::shared_ptr<Entity>& entity)
 {
@@ -17,10 +19,20 @@ void World::add_entity(const std::shared_ptr<Entity>& entity)
 		cameras_.push_back(camera);
 		Logger::info(sstr("Camera added to world (total cameras: ",
 				  cameras_.size(), ")"));
-	} else {
+		return;
-		Logger::info(sstr("Entity added to world (total entities: ",
-				  entities_.size(), ")"));
 	}
+
+	// Check if entity is a light
+	std::shared_ptr<Light> light = std::dynamic_pointer_cast<Light>(entity);
+	if (light) {
+		lights_.push_back(light);
+		Logger::info(sstr("Light added to world (total lights: ",
+				  lights_.size(), ")"));
+		return;
+	}
+
+	Logger::info(sstr(
+	    "Entity added to world (total entities: ", entities_.size(), ")"));
 }
 
 void World::remove_entity(const std::shared_ptr<Entity>& entity)
@@ -43,6 +55,16 @@ void World::remove_entity(const std::shared_ptr<Entity>& entity)
 			Logger::info("Camera removed from world");
 		}
 	}
+
+	// Check if entity is a light and remove from lights list
+	std::shared_ptr<Light> light = std::dynamic_pointer_cast<Light>(entity);
+	if (light) {
+		auto lightIt = std::find(lights_.begin(), lights_.end(), light);
+		if (lightIt != lights_.end()) {
+			lights_.erase(lightIt);
+			Logger::info("Light removed from world");
+		}
+	}
 }
 
 void World::update(float delta_time)
@@ -54,6 +76,10 @@ void World::update(float delta_time)
 
 void World::draw()
 {
+	// Update state with world lighting information
+	state::ambient = ambient_;
+	state::lights  = lights_;
+
 	// Draw for each camera
 	for (auto& camera : cameras_) {
 		// Prepare the camera (sets viewport, projection, view, clears

src/world.h

@@ -4,8 +4,11 @@
 #include <memory>
 #include <vector>
 
+#include "../lib/glm/glm.hpp"
+
 class Entity;
 class Camera;
+class Light;
 
 class World {
 public:
@@ -27,12 +30,23 @@ public:
 		return entities_[index];
 	}
 
+	[[nodiscard]] const glm::vec3& ambient() const
+	{
+		return ambient_;
+	}
+	void set_ambient(const glm::vec3& ambient)
+	{
+		ambient_ = ambient;
+	}
+
 	void update(float delta_time);
 	void draw();
 
 private:
 	std::vector<std::shared_ptr<Entity>> entities_;
 	std::vector<std::shared_ptr<Camera>> cameras_;
+	std::vector<std::shared_ptr<Light>>  lights_;
+	glm::vec3			     ambient_{0.0f, 0.0f, 0.0f};
 };
 
 #endif // WORLD_H_

ugine3d.vcxproj

@@ -164,6 +164,7 @@
     <ClInclude Include="src\camera.h" />
     <ClInclude Include="src\engine.h" />
     <ClInclude Include="src\entity.h" />
+    <ClInclude Include="src\light.h" />
     <ClInclude Include="src\logger.h" />
     <ClInclude Include="src\material.h" />
     <ClInclude Include="src\mesh.h" />
@@ -180,6 +181,7 @@
     <ClCompile Include="src\camera.cpp" />
     <ClCompile Include="src\engine.cpp" />
     <ClCompile Include="src\entity.cpp" />
+    <ClCompile Include="src\light.cpp" />
     <ClCompile Include="src\logger.cpp" />
     <ClCompile Include="src\main.cpp" />
     <ClCompile Include="src\material.cpp" />