more lighting

assets/shaders/basicFragment.frag

@@ -1,16 +1,56 @@
 #version 330 core
 out vec4 FragColor;
 
+in vec3 FragPos;
+in vec3 Normal;
 in vec2 TexCoord;
 
 uniform sampler2D ourTexture;
 uniform sampler2D decal;
 
-void main()
-{
+uniform vec3 lightPos;
+uniform vec3 lightColor;
+uniform vec3 viewPos;
+
+vec4 calcTextures(){
     vec4 tex1 = texture(ourTexture, TexCoord);
     vec4 tex2 = texture(decal, TexCoord);
     vec4 textures = mix(tex1, tex2, 0.2f);
 
-    FragColor = textures;
+    return textures;
+}
+
+vec4 calcDirectLight(norm, viewDir){
+    // Ambient Lighting
+    float ambientStrength = 0.1;
+    vec3 ambient = ambientStrength * lightColor;
+
+    // Diffuse Lighting
+    vec3 lightDir = normalize(lightPos - FragPos);
+
+    float diff = max(dot(norm, lightDir), 0.0);
+    vec3 diffuse = diff * lightColor;
+
+    // Specular Lighting
+    float specularStrength = 0.5;
+
+    vec3 reflectDir = reflect(-lightDir, norm);
+
+    float spec = pow(max(dot(viewDir, reflectDir), 0.0), 32);
+    vec3 specular = specularStrength * spec * lightColor;
+
+    vec4 result = vec4(ambient.rgb + diffuse.rgb + specular.rgb, 1.0f);
+
+    return result;
+}
+
+void main()
+{
+    vec3 norm = normalize(Normal);
+    vec3 viewDir = normalize(viewPos - FragPos);
+
+    vec4 result = calcTextures();
+    result += calcDirectLight(norm, viewDir);
+
+    FragColor = result;
 }

assets/shaders/basicVertex.vert

@@ -3,6 +3,7 @@ layout (location = 0) in vec3 aPos;
 layout (location = 1) in vec3 aNormal;
 layout (location = 2) in vec2 aTexCoord;
 
+out vec3 FragPos;
 out vec3 Normal;
 out vec2 TexCoord;
 
@@ -12,8 +13,9 @@ uniform mat4 projection;
 
 void main()
 {
-    gl_Position = projection * view * model * vec4(aPos, 1.0f);
-
-    Normal = aNormal;
+    FragPos = vec3(model * vec4(aPos, 1.0));
+    Normal = mat3(transpose(inverse(model))) * aNormal;
     TexCoord = aTexCoord;
+
+    gl_Position = projection * view * model * vec4(aPos, 1.0f);
 }

assets/shaders/lightFragment.frag

@@ -0,0 +1,6 @@
+#version 330 core
+out vec4 FragColor;
+
+void main() {
+    FragColor = vec4(1.0);
+}

engine/shader.h

@@ -18,9 +18,7 @@ public:
 	{
 		std::string vertexCode, fragmentCode;
 		std::ifstream vertexFile, fragmentFile;
-		
-		std::cout << vertexPath << std::endl;
-		
+
 		vertexFile.exceptions (std::ifstream::failbit | std::ifstream::badbit);
 		fragmentFile.exceptions (std::ifstream::failbit | std::ifstream::badbit);
 

main.cpp

@@ -74,7 +74,6 @@ int main(int argc, char* argv[])
     */
 
     // Load Shader
-    Shader shaderTest("assets/shaders/basicVertex.vert", "assets/shaders/basicFragment.frag");
     std::vector<Vertex> vertices = {
         // Front face (-z) – normal: (0, 0, -1)
         { -0.5f, -0.5f, -0.5f,   0.0f, 0.0f, -1.0f,   0.0f, 0.0f },
@@ -125,23 +124,12 @@ int main(int argc, char* argv[])
         { -0.5f,  0.5f, -0.5f,   0.0f,  1.0f,  0.0f,   0.0f, 1.0f }
     };
     std::vector<unsigned int> indices = {
-        // Front (-z) ── outer view CCW
-        0,  1,  2,      0,  2,  5,
-
-        // Back (+z) ── outer view CCW
-        6,  7,  8,      6,  8, 11,
-
-        // Left (-x) ── outer view CCW
-       12, 13, 14,     12, 14, 17,
-
-        // Right (+x) ── outer view CCW
-       18, 19, 20,     18, 20, 23,
-
-        // Bottom (-y) ── outer view CCW
-       24, 25, 26,     24, 26, 29,
-
-        // Top (+y) ── outer view CCW
-       30, 31, 32,     30, 32, 35
+        0, 1, 2, 2, 4, 0,
+        6, 7, 8, 8, 10, 6,
+        12, 13, 14, 14, 16, 12,
+        18, 19, 20, 20, 22, 18,
+        24, 25, 26, 26, 28, 24,
+        30, 31, 32, 32, 34, 30
     };
 
     Mesh testMesh(vertices, indices);
@@ -149,12 +137,18 @@ int main(int argc, char* argv[])
     Texture texture1("assets/wall.jpg");
     Texture texture2("assets/awesomeface.png", true);
 
+    Shader shaderTest("assets/shaders/basicVertex.vert", "assets/shaders/basicFragment.frag");
     shaderTest.Use(); // don't forget to activate/use the shader before setting uniforms!
     shaderTest.setInt("ourTexture", 0);
     shaderTest.setInt("decal", 1);
 
+    Shader lightingShader("assets/shaders/basicVertex.vert", "assets/shaders/lightFragment.frag");
+    Mesh lightMesh(vertices, indices);
+
     // Render Loop
     float lastUpdate = 0;
+    glm::vec3 lightPos = glm::vec3(0.0f, 0.0f, 0.0f);
+    glm::vec3 orbitCenter = glm::vec3(0.0f, 0.0f, 0.0f);
     while (!glfwWindowShouldClose(window))
     {
         // per-frame time logic
@@ -183,6 +177,9 @@ int main(int argc, char* argv[])
         glBindTexture(GL_TEXTURE_2D, texture2.ID);
 
         shaderTest.Use();
+        shaderTest.setVec3("lightColor",  1.0f, 1.0f, 1.0f);
+        shaderTest.setVec3("lightPos",  orbitCenter);
+        shaderTest.setVec3("viewPos", camera.position);
 
         // pass projection matrix to shader (note that in this case it could change every frame)
         glm::mat4 projection = glm::perspective(glm::radians(camera.zoom), (float)SCREEN_WIDTH / (float)SCREEN_HEIGHT, 0.1f, 100.0f);
@@ -197,6 +194,25 @@ int main(int argc, char* argv[])
 
         testMesh.Draw();
 
+
+        lightingShader.Use();
+        lightingShader.setMat4("projection", projection);
+        lightingShader.setMat4("view", view);
+        model = glm::mat4(1.0f);
+
+        glm::vec3 offset = glm::vec3(
+            2.0f * cos(glfwGetTime() * 1.0f),
+            0.0f,
+            sin(glfwGetTime() * 1.0f) * 2.0f
+        );
+        orbitCenter = lightPos + offset;
+        model = glm::translate(model, orbitCenter);
+
+        model = glm::scale(model, glm::vec3(0.2f)); // a smaller cube
+        lightingShader.setMat4("model", model);
+
+        lightMesh.Draw();
+
         // Call events & swap buffers
         glfwSwapBuffers(window);
         glfwPollEvents();