Engine Code

shaders/phong.frag

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+#version 330 core
+out vec4 FragColor;
+
+struct Material {
+    sampler2D texture_diffuse1;
+    sampler2D texture_specular1;
+    float shininess;
+}; 
+
+struct DirLight {
+    vec3 direction;
+
+    vec3 ambient;
+    vec3 diffuse;
+    vec3 specular;
+};
+
+struct PointLight {
+    vec3 position;
+
+    float constant;
+    float linear;
+    float quadratic;
+
+    vec3 ambient;
+    vec3 diffuse;
+    vec3 specular;
+};
+
+#define MAX_POINT_LIGHTS 4
+
+in vec3 FragPos;
+in vec3 Normal;
+in vec2 TexCoords;
+
+uniform vec3 viewPos;
+uniform Material material;
+uniform DirLight dirLight;
+uniform PointLight pointLights[MAX_POINT_LIGHTS];
+uniform int numPointLights;
+
+// Function prototypes
+vec3 CalcDirLight(DirLight light, vec3 normal, vec3 viewDir);
+vec3 CalcPointLight(PointLight light, vec3 normal, vec3 fragPos, vec3 viewDir);
+
+void main()
+{    
+    // Properties
+    vec3 norm = normalize(Normal);
+    vec3 viewDir = normalize(viewPos - FragPos);
+
+    // Phase 1: Directional lighting
+    vec3 result = CalcDirLight(dirLight, norm, viewDir);
+
+    // Phase 2: Point lights
+    for(int i = 0; i < 1; i++)
+        result += CalcPointLight(pointLights[i], norm, FragPos, viewDir);    
+
+    // If no texture is bound, use a default color
+    vec4 texColor = vec4(0.8, 0.8, 0.8, 1.0);
+
+    FragColor = vec4(result, 1.0) * texColor;
+}
+
+// Calculates the color when using a directional light
+vec3 CalcDirLight(DirLight light, vec3 normal, vec3 viewDir)
+{
+    vec3 lightDir = normalize(-light.direction);
+
+    // Diffuse shading
+    float diff = max(dot(normal, lightDir), 0.0);
+
+    // Specular shading
+    vec3 reflectDir = reflect(-lightDir, normal);
+    float spec = pow(max(dot(viewDir, reflectDir), 0.0), 32.0);
+
+    // Combine results
+    vec3 ambient = light.ambient;
+    vec3 diffuse = light.diffuse * diff;
+    vec3 specular = light.specular * spec;
+
+    return (ambient + diffuse + specular);
+}
+
+// Calculates the color when using a point light
+vec3 CalcPointLight(PointLight light, vec3 normal, vec3 fragPos, vec3 viewDir)
+{
+    vec3 lightDir = normalize(light.position - fragPos);
+
+    // Diffuse shading
+    float diff = max(dot(normal, lightDir), 0.0);
+
+    // Specular shading
+    vec3 reflectDir = reflect(-lightDir, normal);
+    float spec = pow(max(dot(viewDir, reflectDir), 0.0), 32.0);
+
+    // Attenuation
+    float distance = length(light.position - fragPos);
+    float attenuation = 1.0 / (light.constant + light.linear * distance + light.quadratic * (distance * distance));    
+
+    // Combine results
+    vec3 ambient = light.ambient;
+    vec3 diffuse = light.diffuse * diff;
+    vec3 specular = light.specular * spec;
+
+    ambient *= attenuation;
+    diffuse *= attenuation;
+    specular *= attenuation;
+
+    return (ambient + diffuse + specular);
+}

shaders/phong.vert

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+#version 330 core
+layout (location = 0) in vec3 aPos;
+layout (location = 1) in vec3 aNormal;
+layout (location = 2) in vec2 aTexCoords;
+
+out vec3 FragPos;
+out vec3 Normal;
+out vec2 TexCoords;
+
+uniform mat4 model;
+uniform mat4 view;
+uniform mat4 projection;
+
+void main()
+{
+    FragPos = vec3(model * vec4(aPos, 1.0));
+    Normal = mat3(transpose(inverse(model))) * aNormal;  
+    TexCoords = aTexCoords;
+
+    gl_Position = projection * view * vec4(FragPos, 1.0);
+}