Improved CMakeLists for clearer project setup with added library support for stb_image.

src/6.pbr/1.1.lighting/pbr.frag

@@ -85,7 +85,7 @@ void main()
         // Cook-Torrance BRDF
         float NDF = DistributionGGX(N, H, roughness);   
         float G   = GeometrySmith(N, V, L, roughness);      
-        vec3 F = fresnelSchlick(max(dot(H, V), 0.0), F0);
+        vec3 F    = fresnelSchlick(max(dot(H, V), 0.0), F0);
            
         vec3 nominator    = NDF * G * F; 
         float denominator = 4 * max(dot(V, N), 0.0) * max(dot(L, N), 0.0) + 0.001; // 0.001 to prevent divide by zero.

src/6.pbr/1.2.lighting_textured/pbr.frag

@@ -112,7 +112,7 @@ void main()
         // Cook-Torrance BRDF
         float NDF = DistributionGGX(N, H, roughness);   
         float G   = GeometrySmith(N, V, L, roughness);    
-        vec3 F = fresnelSchlick(max(dot(H, V), 0.0), F0);        
+        vec3 F    = fresnelSchlick(max(dot(H, V), 0.0), F0);        
         
          // kS is equal to Fresnel
         vec3 kS = F;

src/stb_image.cpp

@@ -0,0 +1,2 @@
+#define STB_IMAGE_IMPLEMENTATION
+#include "stb_image.h"