fix: fix light direction and spotlight

Author: AhmedAmrNabil

assets/shaders/lit.frag

@@ -117,8 +117,8 @@ vec3 calcLight(
 
         if(light.type == LIGHT_SPOT) {
             float theta = dot(L, normalize(-light.direction));
-            float innerCos = light.spotAngles.x;
-            float outerCos = light.spotAngles.y;
+            float innerCos = cos(light.spotAngles.x);
+            float outerCos = cos(light.spotAngles.y);
             float epsilon = innerCos - outerCos;
             float spot = clamp((theta - outerCos) / epsilon, 0.0, 1.0);
             attenuation *= spot;

src/common/systems/forward-renderer.cpp

@@ -161,7 +161,7 @@ namespace our {
                 // assume default light direction points to - z direction in local space
                 // so away from the camera if the light is attached to the camera
                 // this could be useful for rifle flashlight for example
-                lightData.direction = glm::normalize(glm::vec3(localToWorld * glm::vec4(0, 0, 1, 0)));
+                lightData.direction = glm::normalize(glm::vec3(localToWorld * glm::vec4(0, 0, -1, 0)));
                 lightData.attenuation = light->attenuation;
                 lightData.spotAngles = light->spotAngles;
                 sceneLights.push_back(lightData);