Reset PBR shader features

examples/models/resources/shaders/pbr.fs

@@ -16,10 +16,9 @@
 #define     LIGHT_POINT             1
 
 struct MaterialProperty {
-    int enabled;
-    sampler2D sampler;
-    float value;
     vec3 color;
+    int useSampler;
+    sampler2D sampler;
 };
 
 struct Light {
@@ -31,8 +30,8 @@ struct Light {
 };
 
 // Input vertex attributes (from vertex shader)
-in vec3 fragPosition;
 in vec2 fragTexCoord;
+in vec3 fragPos;
 in vec3 fragNormal;
 in vec3 fragTangent;
 in vec3 fragBinormal;
@@ -46,15 +45,14 @@ uniform MaterialProperty occlusion;
 uniform MaterialProperty emission;
 uniform MaterialProperty height;
 
+// Input lighting values
+uniform Light lights[MAX_LIGHTS];
+
 // Input uniform values
 uniform samplerCube irradianceMap;
 uniform samplerCube prefilterMap;
 uniform sampler2D brdfLUT;
 
-// Input lighting values
-uniform Light lights[MAX_LIGHTS];
-
-
 // Other uniform values
 uniform int renderMode;
 uniform vec3 viewPos;
@@ -66,6 +64,7 @@ const float PI = 3.14159265359;
 // Output fragment color
 out vec4 finalColor;
 
+vec3 ComputeMaterialProperty(MaterialProperty property);
 float DistributionGGX(vec3 N, vec3 H, float roughness);
 float GeometrySchlickGGX(float NdotV, float roughness);
 float GeometrySmith(vec3 N, vec3 V, vec3 L, float roughness);
@@ -73,6 +72,12 @@ vec3 fresnelSchlick(float cosTheta, vec3 F0);
 vec3 fresnelSchlickRoughness(float cosTheta, vec3 F0, float roughness);
 vec2 ParallaxMapping(vec2 texCoords, vec3 viewDir);
 
+vec3 ComputeMaterialProperty(MaterialProperty property)
+{
+    if (property.useSampler == 1) return texture(property.sampler, texCoord).rgb;
+    else return property.color;
+}
+
 float DistributionGGX(vec3 N, vec3 H, float roughness)
 {
     float a = roughness*roughness;
@@ -97,7 +102,6 @@ float GeometrySchlickGGX(float NdotV, float roughness)
 
     return nom/denom;
 }
-
 float GeometrySmith(vec3 N, vec3 V, vec3 L, float roughness)
 {
     float NdotV = max(dot(N, V), 0.0);
@@ -169,25 +173,25 @@ void main()
 
     // Calculate lighting required attributes
     vec3 normal = normalize(fragNormal);
-    vec3 view = normalize(viewPos - fragPosition);
+    vec3 view = normalize(viewPos - fragPos);
     vec3 refl = reflect(-view, normal);
 
     // Check if parallax mapping is enabled and calculate texture coordinates to use based on height map
-    if (height.enabled == 1) texCoord = ParallaxMapping(fragTexCoord, view);
+    if (height.useSampler == 1) texCoord = ParallaxMapping(fragTexCoord, view);
     else texCoord = fragTexCoord;   // Use default texture coordinates
 
     // Fetch material values from texture sampler or color attributes
-    vec3 color = pow(texture(albedo.sampler, texCoord).rgb, vec3(2.2));
+    vec3 color = ComputeMaterialProperty(albedo);
-    vec3 metal = texture(metalness.sampler, texCoord).rgb;
+    vec3 metal = ComputeMaterialProperty(metalness);
-    vec3 rough = texture(roughness.sampler, texCoord).rgb;
+    vec3 rough = ComputeMaterialProperty(roughness);
-    vec3 emiss = vec3(0);//texture(emission.sampler, texCoord).rgb;
+    vec3 emiss = ComputeMaterialProperty(emission);
-    vec3 ao = texture(occlusion.sampler, texCoord).rgb;
+    vec3 ao = ComputeMaterialProperty(occlusion);
 
     // Check if normal mapping is enabled
-    if (normals.enabled == 1)
+    if (normals.useSampler == 1)
     {
         // Fetch normal map color and transform lighting values to tangent space
-        normal = texture(normals.sampler, texCoord).rgb; //ComputeMaterialProperty(normals);
+        normal = ComputeMaterialProperty(normals);
         normal = normalize(normal*2.0 - 1.0);
         normal = normalize(normal*TBN);
 
@@ -203,7 +207,6 @@ void main()
     vec3 Lo = vec3(0.0);
     vec3 lightDot = vec3(0.0);
 
-    /*
     for (int i = 0; i < MAX_LIGHTS; i++)
     {
         if (lights[i].enabled == 1)
@@ -214,8 +217,8 @@ void main()
             if (lights[i].type == LIGHT_DIRECTIONAL) light = -normalize(lights[i].target - lights[i].position);
             else if (lights[i].type == LIGHT_POINT)
             {
-                light = normalize(lights[i].position - fragPosition);
+                light = normalize(lights[i].position - fragPos);
-                float distance = length(lights[i].position - fragPosition);
+                float distance = length(lights[i].position - fragPos);
                 float attenuation = 1.0/(distance*distance);
                 radiance *= attenuation;
             }
@@ -245,7 +248,6 @@ void main()
             lightDot += radiance*NdotL + brdf*lights[i].color.a;
         }
     }
-    */
 
     // Calculate ambient lighting using IBL
     vec3 F = fresnelSchlickRoughness(max(dot(normal, view), 0.0), F0, rough.r);
@@ -267,7 +269,6 @@ void main()
 
     // Calculate fragment color based on render mode
     vec3 fragmentColor = ambient + Lo + emiss;                              // Physically Based Rendering
-
     if (renderMode == 1) fragmentColor = color;                             // Albedo
     else if (renderMode == 2) fragmentColor = normal;                       // Normals
     else if (renderMode == 3) fragmentColor = metal;                        // Metalness
@@ -286,5 +287,5 @@ void main()
     fragmentColor = pow(fragmentColor, vec3(1.0/2.2));
 
     // Calculate final fragment color
-    finalColor = vec4(fragmentColor, 1.0);      // It works, so texture is correctly binded!
+    finalColor = vec4(fragmentColor, 1.0);
 }