[FEATURE] single light support

src/entities/Entity.h

@@ -5,6 +5,10 @@
 
 namespace entities
 {
+	/*
+	 * This class represents a movable model in the game
+	 */
+	
 	class Entity
 	{
 	private:

src/entities/light.h

@@ -0,0 +1,25 @@
+#pragma once
+
+#include <glm/vec3.hpp>
+
+namespace entities
+{
+	/*
+	 * This class represents a light in the game 
+	 */
+	
+	class Light
+	{
+	private:
+		glm::vec3 position;
+		glm::vec3 color;
+
+	public:
+		Light(const glm::vec3& position, const glm::vec3& color) : position(position), color(color) { }
+
+		glm::vec3 GetPosition() const { return position; }
+		void setPosition(const glm::vec3& position) { this->position = position; }
+		glm::vec3 GetColor() const { return color; }
+		void setColor(const glm::vec3& color) { this->color = color; }
+	};
+}

src/main.cpp

@@ -48,8 +48,12 @@ int main(void)
 	
     models::RawModel raw_model = LoadObjModel("res/Tree.obj");
     models::ModelTexture texture = { render_engine::loader::LoadTexture("res/TreeTexture.png") };
+    texture.shine_damper = 10;
+    texture.reflectivity = 1;
     models::TexturedModel model = { raw_model, texture };
-    entities::Entity entity(model, glm::vec3(0, -5, -20), glm::vec3(0, 0, 0), 1);
+    entities::Entity entity(model, glm::vec3(0, -25, -50), glm::vec3(0, 0, 0), 1);
+
+    entities::Light light(glm::vec3(0, 0, -30), glm::vec3(1, 1, 1));
 	
     shaders::StaticShader shader;
     shader.Init();
@@ -68,6 +72,7 @@ int main(void)
 		// Render
         render_engine::renderer::Prepare();
         shader.Start();
+        shader.LoadLight(light);
         shader.LoadViewMatrix(camera);
 		
         render_engine::renderer::Render(entity, shader);

src/models/Model.h

@@ -19,10 +19,15 @@ namespace models
 
 	/*
 		Structure for storing a texture (texture_id) to apply to a RawModel.
+
+		shine_damper = A damper for the angle the model needs to be look at to see reflections
+		reflectivity = The amount of light the model reflects
 	*/
 	struct ModelTexture
 	{
 		GLuint texture_id;
+		float shine_damper = 1;
+		float reflectivity = 0;
 	};
 	
 	/*

src/renderEngine/Loader.cpp

@@ -17,12 +17,13 @@ namespace render_engine
 		/*
 			This function will generate a Model from vertex positions, textureCoordinates and indices.
 		*/
-		struct models::RawModel LoadToVAO(std::vector<float>& positions, std::vector<float>& texture_coords, std::vector<unsigned int>& indices)
+		models::RawModel LoadToVAO(std::vector<float>& positions, std::vector<float>& texture_coords, std::vector<float>& normals, std::vector<unsigned int>& indices)
 		{
 			GLuint vao_id = CreateVao();
 			BindIndicesBuffer(indices);
 			StoreDataInAttributeList(0, 3, positions);
 			StoreDataInAttributeList(1, 2, texture_coords);
+			StoreDataInAttributeList(2, 3, normals);
 			glBindVertexArray(0);
 			return { vao_id, static_cast<int>(indices.size()) };
 		}

src/renderEngine/Loader.h

@@ -11,7 +11,7 @@ namespace render_engine
 		/*
 			This function generates a model from model data.
 		*/
-		struct models::RawModel LoadToVAO(std::vector<float>& positions, std::vector<float>& texture_coords, std::vector<unsigned int>& indices);
+		models::RawModel LoadToVAO(std::vector<float>& positions, std::vector<float>& texture_coords, std::vector<float>& normals, std::vector<unsigned int>& indices);
 
 		/*
 			Loads a texture from a file into openGL using stb_image.h

src/renderEngine/Renderer.cpp

@@ -17,9 +17,14 @@ namespace render_engine
 		 */
 		void Init(shaders::StaticShader& shader)
 		{
+			// Faces which are not facing the camera are not rendered
+			glEnable(GL_CULL_FACE);
+			glCullFace(GL_BACK);
+			
 			const glm::mat4 projectionMatrix = 
 				glm::perspective(glm::radians(FOV), (WINDOW_WIDTH / WINDOW_HEIGT), NEAR_PLANE, FAR_PLANE);
-			
+
+			// Load the projectionmatrix into the shader
 			shader.Start();
 			shader.LoadProjectionMatrix(projectionMatrix);
 			shader.Stop();
@@ -41,26 +46,31 @@ namespace render_engine
 		void Render(entities::Entity& entity, shaders::StaticShader& shader)
 		{
 			const models::TexturedModel model = entity.GetModel();
-			const models::RawModel rawModel = model.raw_model;
+			const models::RawModel raw_model = model.raw_model;
+			const models::ModelTexture texture = model.texture;
 
 			// Enable the model
-			glBindVertexArray(rawModel.vao_id);
+			glBindVertexArray(raw_model.vao_id);
 
-			// Enable the inputs for the vertexShader
+			// Enable the VBO's from the model (VAO)
 			glEnableVertexAttribArray(0);
 			glEnableVertexAttribArray(1);
+			glEnableVertexAttribArray(2);
 
 			// Load the transformation of the model into the shader
 			const glm::mat4 modelMatrix = toolbox::CreateModelMatrix(entity.GetPosition(), entity.GetRotation(), entity.GetScale());
 			shader.LoadModelMatrix(modelMatrix);
+			shader.LoadShineVariables(texture.shine_damper, texture.reflectivity);
 			
 			// Draw the model
 			glActiveTexture(GL_TEXTURE0);
 			glBindTexture(GL_TEXTURE_2D, model.texture.texture_id);
-			glDrawElements(GL_TRIANGLES, rawModel.vertex_count, GL_UNSIGNED_INT, 0);
+			glDrawElements(GL_TRIANGLES, raw_model.vertex_count, GL_UNSIGNED_INT, 0);
-			
+
+			// Disable the VBO's and model
 			glDisableVertexAttribArray(0);
 			glDisableVertexAttribArray(1);
+			glDisableVertexAttribArray(2);
 			glBindVertexArray(0);
 		}
 	}

src/renderEngine/obj_loader.cpp

@@ -125,5 +125,5 @@ models::RawModel LoadObjModel(std::string file_name)
         vertex_array[p++] = vertex.z;
     }
 
-    return render_engine::loader::LoadToVAO( vertex_array, texture_array, indices);
+    return render_engine::loader::LoadToVAO( vertex_array, texture_array, normal_array, indices);
 }

src/shaders/static_shader.cpp

@@ -12,21 +12,34 @@ namespace shaders
 	in vec3 position;
 	// Coordinates of the texture
 	in vec2 texture_coords;
+	// The normal of the vertex
+	in vec3 normal;
 
 	// Equal to the texture_coords
 	out vec2 pass_texture_coords;
+	out vec3 surface_normal;
+	out vec3 to_light_vector;
+	out vec3 to_camera_vector;
 
 	uniform mat4 model_matrix;
 	uniform mat4 projection_matrix;
 	uniform mat4 view_matrix;
+	uniform vec3 light_position;
 
 	void main(void)
 	{
+		// Calculate the real position of the vertex (after rotation and scaling)
+		vec4 world_position = model_matrix * vec4(position, 1.0);
+	
 		// Tell OpenGL where to render the vertex
-		gl_Position = projection_matrix * view_matrix * model_matrix * vec4(position, 1.0);
+		gl_Position = projection_matrix * view_matrix * world_position;
 
-		// Pass the texture_coords directly to the fragment shader
+		// Pass the textureCoords directly to the fragment shader
 		pass_texture_coords = texture_coords;
+
+		surface_normal = (model_matrix * vec4(normal, 0.0)).xyz;
+		to_light_vector = light_position - world_position.xyz;
+		to_camera_vector = (inverse(view_matrix) * vec4(0.0, 0.0, 0.0, 1.0)).xyz - world_position.xyz;
 	}
 	)";
 	
@@ -39,15 +52,40 @@ namespace shaders
 	// Interpolated textureCoordinates of the vertex (relative to the distance to each vertex)
 	in vec2 pass_texture_coords;
 
+	in vec3 surface_normal;
+	in vec3 to_light_vector;
+	in vec3 to_camera_vector;
+
 	// Final color of the pixel
 	out vec4 out_color;
 
 	// The texture of the model
 	uniform sampler2D texture_sampler;
 
+	uniform vec3 light_color;
+	uniform float shine_damper;
+	uniform float reflectivity;
+	
 	void main(void)
 	{
-		out_color = texture(texture_sampler, pass_texture_coords);
+		vec3 unit_normal = normalize(surface_normal);
+		vec3 unit_light_vector = normalize(to_light_vector);
+		vec3 unit_camera_vector = normalize(to_camera_vector); 
+
+		// Calculate the diffuse lighting
+		float dot_diffuse = dot(unit_normal, unit_light_vector);
+		float brightness = max(dot_diffuse, 0.1);
+		vec3 diffuse = brightness * light_color;
+
+		// Calculate the specular lighting
+		vec3 light_direction = -unit_light_vector;
+		vec3 reflected_light_direction = reflect(light_direction, unit_normal);
+		float dot_specular = dot(reflected_light_direction, unit_camera_vector);
+		dot_specular = max(dot_specular, 0.0);
+		float damped_specular = pow(dot_specular, shine_damper);
+		vec3 specular = damped_specular * reflectivity * light_color;
+		
+		out_color = vec4(diffuse, 1.0) * texture(texture_sampler, pass_texture_coords) + vec4(specular, 1.0);
 	}
 	)";
 	
@@ -72,16 +110,35 @@ namespace shaders
 		LoadMatrix(location_view_matrix, view_matrix);
 	}
 
+	void StaticShader::LoadLight(entities::Light& light) const
+	{
+		LoadVector(location_light_position, light.GetPosition());
+		LoadVector(location_light_color, light.GetColor());
+	}
+
+	void StaticShader::LoadShineVariables(float shine_damper, float reflectivity) const
+	{
+		LoadFloat(location_shine_damper, shine_damper);
+		LoadFloat(location_reflectivity, reflectivity);
+	}
+
 	void StaticShader::SetAttributes() const
 	{
+		// Load the position VBO and textureCoords VBO from the VAO into the shader "in" variables
 		SetAttribute(0, "position");
 		SetAttribute(1, "texture_coords");
+		SetAttribute(2, "normal");
 	}
 
 	void StaticShader::GetAllUniformLocations()
 	{
+		// Get the locations from the uniform variables from the shaders
 		location_model_matrix = GetUniformLocation("model_matrix");
 		location_projection_matrix = GetUniformLocation("projection_matrix");
 		location_view_matrix = GetUniformLocation("view_matrix");
+		location_light_position = GetUniformLocation("light_position");
+		location_light_color = GetUniformLocation("light_color");
+		location_shine_damper = GetUniformLocation("shine_damper");
+		location_reflectivity = GetUniformLocation("reflectivity");
 	}
 }

src/shaders/static_shader.h

@@ -3,6 +3,7 @@
 #include <glm/gtc/matrix_transform.hpp>
 #include "shader_program.h"
 #include "../entities/camera.h"
+#include "../entities/light.h"
 
 /*
 	This class does represents the shaders for the models.
@@ -16,6 +17,10 @@ namespace shaders
 		GLuint location_model_matrix;
 		GLuint location_projection_matrix;
 		GLuint location_view_matrix;
+		GLuint location_light_position;
+		GLuint location_light_color;
+		GLuint location_shine_damper;
+		GLuint location_reflectivity;
 		
 	public:
 		StaticShader();
@@ -23,6 +28,9 @@ namespace shaders
 		void LoadModelMatrix(const glm::mat4& matrix) const;
 		void LoadProjectionMatrix(const glm::mat4& projection) const;
 		void LoadViewMatrix(entities::Camera& camera) const;
+
+		void LoadLight(entities::Light& light) const;
+		void LoadShineVariables(float shine_damper, float reflectivity) const;
 			
 	protected:
 		void SetAttributes() const override;

wk2_fps.vcxproj

@@ -32,6 +32,7 @@
   <ItemGroup>
     <ClInclude Include="src\entities\camera.h" />
     <ClInclude Include="src\entities\entity.h" />
+    <ClInclude Include="src\entities\light.h" />
     <ClInclude Include="src\models\model.h" />
     <ClInclude Include="src\renderEngine\loader.h" />
     <ClInclude Include="src\renderEngine\obj_loader.h" />

wk2_fps.vcxproj.filters

@@ -74,5 +74,8 @@
     <ClInclude Include="src\toolbox\toolbox.h">
       <Filter>Header Files</Filter>
     </ClInclude>
+    <ClInclude Include="src\entities\light.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
   </ItemGroup>
 </Project>