feat: light rendering

src/renderer/renderer.cpp

@@ -75,6 +75,8 @@ void Renderer::Render(entt::registry& registry) {
             return;
         }
 
+        m_shader.setBool("isLight", registry.all_of<light>(entity));
+
         m_model = glm::mat4(1.0f);
 
         // Apply translation

src/shaders/simple.fs

@@ -27,6 +27,8 @@ uniform float opacity;
 uniform sampler2D diffuseTex;
 uniform bool useTexture;
 
+uniform bool isLight;
+
 #define LIGHT_COLOR vec3(1.0, 1.0, 1.0)
 
 void main()
@@ -57,5 +59,11 @@ void main()
 
     vec3 result = (ambient + diffuse + specular) * texColor;
 
+    if (isLight) {
+        vec3 emissive = LIGHT_COLOR * 10.0; // big intensity
+        FragColor = vec4(emissive, 1.0);
+        return;
+    }
+
     FragColor = vec4(result, opacity);
 }