finished basic lighting chapter (look into converting everything into viewspace instead worldspace)

src/Engine/main.cpp

@@ -15,7 +15,7 @@
 
 #include "vertices.h"
 
-// Continue: https://learnopengl.com/Lighting/Basic-Lighting
+// Continue: https://learnopengl.com/Lighting/Materials
 // Chapter: Not yet started
 //
 // TODO: look at project->properties->VC++ Directories-> change everything to the Environment var
@@ -171,8 +171,8 @@ int main()
 	//Texture2D containerImage("images/container.jpg");
 	//Texture2D faceImage("images/awesomeface.png", 0, GL_RGBA);
 	
-	std::vector<float> verts(std::begin(vertices_cube), std::end(vertices_cube));
+	std::vector<float> verts(std::begin(vertices_cube_normals), std::end(vertices_cube_normals));
-	std::vector<Nebulix::VertexAttribute> vertexAttribs = { Nebulix::VertexAttribute() };
+	std::vector<Nebulix::VertexAttribute> vertexAttribs = { Nebulix::VertexAttribute(), Nebulix::VertexAttribute() };
 	Nebulix::GameObject cube(verts, vertexAttribs);
 	vec3 lightPosition = glm::vec3(1.2f, 1.0f, 2.0f);
 	Nebulix::GameObject lightBulb(verts, vertexAttribs, lightPosition, glm::vec3(0.2f));
@@ -188,7 +188,7 @@ int main()
 		deltaTime = currentFrameTime - lastFrameTime;
 		lastFrameTime = currentFrameTime;
 
-		glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
+		glClearColor(0.1f, 0.1f, 0.1f, 1.0f);
 		glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 
 		ProcessInput(window);
@@ -198,15 +198,26 @@ int main()
 		for (size_t i = 0; i < allShaders.size(); i++)
 		{
 			auto shader = allShaders[i];
+			auto model = allObjects[i].GetModelMatrix();
+
+			if(i == 0)
+			{
+				float angle = 20.0f * currentFrameTime;
+				model = glm::rotate(model, glm::radians(angle), glm::vec3(1.0f, 0.3f, 0.5f));
+			}
+
 			shader->Use();
 			shader->SetMatrix("viewMatrix", cam.GetViewMatrix()); // more or less the camera
 			shader->SetMatrix("projectionMatrix", projectionMatrix);
-			shader->SetMatrix("modelMatrix", allObjects[i].GetModelMatrix());
+			//shader->SetMatrix("modelMatrix", allObjects[i].GetModelMatrix());
+			shader->SetMatrix("modelMatrix", model);
 		}
 
 		lighting->Use();
 		lighting->SetFloat("lightColour", 1.0f, 1.0f, 1.0f);
 		lighting->SetFloat("objectColour", 1.0f, 0.5f, 0.31f);
+		lighting->SetFloat("lightPosition", lightPosition);
+		lighting->SetFloat("viewPosition", cam.Position);
 
 		for (size_t i = 0; i < allObjects.size(); i++)
 		{

src/Engine/object/game_object.h

@@ -16,7 +16,7 @@ namespace Nebulix
 		int NrOfElements = 3;
 		int Stride;
 
-		VertexAttribute(GLenum attributeType = GL_FLOAT, GLboolean normalised = GL_FALSE, int nrOfElements = 3)
+		VertexAttribute(int nrOfElements = 3, GLenum attributeType = GL_FLOAT, GLboolean normalised = GL_FALSE)
 			: AttributeType{ attributeType }, Normalised{ normalised }, NrOfElements{ nrOfElements }
 		{
 			if (attributeType == GL_INT)

src/Engine/shaders/Shader.h

@@ -49,6 +49,10 @@ namespace Nebulix
 		{
 			glUniform4f(glGetUniformLocation(shaderId, name.c_str()), x, y, z, w);
 		}
+		void SetFloat(const std::string& name, glm::vec3 vec) const
+		{
+			glUniform3f(glGetUniformLocation(shaderId, name.c_str()), vec.x, vec.y, vec.z);
+		}
 
 		void SetMatrix(const std::string& name, glm::mat4 mat) const
 		{

src/Engine/shaders/default/default.frag

@@ -2,8 +2,27 @@
 out vec4 FragColor;
 
 uniform vec3 lightColour, objectColour;
+uniform vec3 lightPosition, viewPosition;
+
+in vec3 FragmentPos;
+in vec3 Normal;
 
 void main()
 {
-	FragColor = vec4(lightColour * objectColour, 1.0);
+	float ambientStrength = 0.1;
+	vec3 ambientLight = lightColour * ambientStrength;
+
+	vec3 normal = normalize(Normal);
+	vec3 lightDir = normalize(lightPosition - FragmentPos);
+	float diff = max(dot(normal, lightDir), 0.0);
+	vec3 diffuseLight = diff * lightColour;
+
+	float specularStrength = 0.5;
+	vec3 viewDir = normalize(viewPosition - FragmentPos);
+	vec3 reflectDir = reflect(-lightDir, normal);
+	float spec = pow(max(dot(viewDir, reflectDir), 0.0), 32); // The exponent (here 32) is the shininess of the specular highlight
+	vec3 specularLight = specularStrength * spec * lightColour;
+
+	vec3 result = (ambientLight + diffuseLight + specularLight) * objectColour;
+	FragColor = vec4(result, 1.0);
 } 

src/Engine/shaders/default/default.vert

@@ -1,12 +1,19 @@
 #version 330 core
 layout (location = 0) in vec3 aPos;
+layout (location = 1) in vec3 normalVector;
 
 uniform mat4 modelMatrix;
 uniform mat4 viewMatrix;
 uniform mat4 projectionMatrix;
 
+out vec3 FragmentPos;
+out vec3 Normal;
+
 void main()
 {
+	// NOTE: inverse() is very costly to calculate, so the normal matrix should be calculated on the CPU and sent over (just like we do with the model matrix)
+	Normal = mat3(transpose(inverse(modelMatrix))) * normalVector;
+	FragmentPos = vec3((modelMatrix) * vec4(aPos, 1.0));
 	// note that we read the multiplication from right to left
     gl_Position = projectionMatrix * viewMatrix * modelMatrix * vec4(aPos, 1.0);
 }

src/Engine/vertices.h

@@ -45,6 +45,50 @@ float vertices_cube[] = {
     -0.5f,  0.5f, -0.5f
 };
 
+float vertices_cube_normals[] = { // object coordinates; normal vector
+    -0.5f, -0.5f, -0.5f,  0.0f,  0.0f, -1.0f,
+     0.5f, -0.5f, -0.5f,  0.0f,  0.0f, -1.0f,
+     0.5f,  0.5f, -0.5f,  0.0f,  0.0f, -1.0f,
+     0.5f,  0.5f, -0.5f,  0.0f,  0.0f, -1.0f,
+    -0.5f,  0.5f, -0.5f,  0.0f,  0.0f, -1.0f,
+    -0.5f, -0.5f, -0.5f,  0.0f,  0.0f, -1.0f,
+
+    -0.5f, -0.5f,  0.5f,  0.0f,  0.0f, 1.0f,
+     0.5f, -0.5f,  0.5f,  0.0f,  0.0f, 1.0f,
+     0.5f,  0.5f,  0.5f,  0.0f,  0.0f, 1.0f,
+     0.5f,  0.5f,  0.5f,  0.0f,  0.0f, 1.0f,
+    -0.5f,  0.5f,  0.5f,  0.0f,  0.0f, 1.0f,
+    -0.5f, -0.5f,  0.5f,  0.0f,  0.0f, 1.0f,
+
+    -0.5f,  0.5f,  0.5f, -1.0f,  0.0f,  0.0f,
+    -0.5f,  0.5f, -0.5f, -1.0f,  0.0f,  0.0f,
+    -0.5f, -0.5f, -0.5f, -1.0f,  0.0f,  0.0f,
+    -0.5f, -0.5f, -0.5f, -1.0f,  0.0f,  0.0f,
+    -0.5f, -0.5f,  0.5f, -1.0f,  0.0f,  0.0f,
+    -0.5f,  0.5f,  0.5f, -1.0f,  0.0f,  0.0f,
+
+     0.5f,  0.5f,  0.5f,  1.0f,  0.0f,  0.0f,
+     0.5f,  0.5f, -0.5f,  1.0f,  0.0f,  0.0f,
+     0.5f, -0.5f, -0.5f,  1.0f,  0.0f,  0.0f,
+     0.5f, -0.5f, -0.5f,  1.0f,  0.0f,  0.0f,
+     0.5f, -0.5f,  0.5f,  1.0f,  0.0f,  0.0f,
+     0.5f,  0.5f,  0.5f,  1.0f,  0.0f,  0.0f,
+
+    -0.5f, -0.5f, -0.5f,  0.0f, -1.0f,  0.0f,
+     0.5f, -0.5f, -0.5f,  0.0f, -1.0f,  0.0f,
+     0.5f, -0.5f,  0.5f,  0.0f, -1.0f,  0.0f,
+     0.5f, -0.5f,  0.5f,  0.0f, -1.0f,  0.0f,
+    -0.5f, -0.5f,  0.5f,  0.0f, -1.0f,  0.0f,
+    -0.5f, -0.5f, -0.5f,  0.0f, -1.0f,  0.0f,
+
+    -0.5f,  0.5f, -0.5f,  0.0f,  1.0f,  0.0f,
+     0.5f,  0.5f, -0.5f,  0.0f,  1.0f,  0.0f,
+     0.5f,  0.5f,  0.5f,  0.0f,  1.0f,  0.0f,
+     0.5f,  0.5f,  0.5f,  0.0f,  1.0f,  0.0f,
+    -0.5f,  0.5f,  0.5f,  0.0f,  1.0f,  0.0f,
+    -0.5f,  0.5f, -0.5f,  0.0f,  1.0f,  0.0f
+};
+
 float vertices_container[] = { // object coordinates, uv-coordinates
 -0.5f, -0.5f, -0.5f,  0.0f, 0.0f,
  0.5f, -0.5f, -0.5f,  1.0f, 0.0f,