PBR is now implemented

data/models/wooden_boxbarrel/wooden_box_and_barrel.mtl

@@ -14,5 +14,7 @@ map_Bump wooden box and barrel/boxes_DefaultMaterial_Normal.png
 map_Kd wooden box and barrel/boxes_DefaultMaterial_BaseColor.png
 map_Pr wooden box and barrel/boxes_DefaultMaterial_Roughness.jpg
 map_Pm wooden box and barrel/boxes_DefaultMaterial_Metallic.jpg
-map_Ps wooden box and barrel/boxes_DefaultMaterial_AO.jpg
-map_RMA wooden box and barrel/boxes_DefaultMaterial_ORM.jpg
+# map_Ps wooden box and barrel/boxes_DefaultMaterial_AO.jpg
+map_Ps wooden box and barrel/boxes_DefaultMaterial_RMA.jpg
+map_RMA wooden box and barrel/boxes_DefaultMaterial_RMA.jpg
+map_ORM wooden box and barrel/boxes_DefaultMaterial_ORM.jpg

data/shaders/pbrFragment.glsl

@@ -20,19 +20,13 @@ uniform int tick;
 
 //float metallic = 0.3f;
 //float roughness = 0.3f;
-float ao = 0.8f;
+//float ao = 0.8f;
 
 // Handle multiple textures from the Mesh Object (Might not even be used)
 uniform sampler2D texture_diffuse1;
 uniform sampler2D texture_diffuse2;
-uniform sampler2D texture_specular1;
-uniform sampler2D texture_specular2;
-uniform sampler2D texture_metalness1;
-uniform sampler2D texture_metalness2;
-uniform sampler2D texture_roughness1;
-uniform sampler2D texture_roughness2;
-uniform sampler2D texture_sheen1;
-uniform sampler2D texture_sheen2;
+uniform sampler2D texture_rma1;
+
 
 // PBR functions from learnOpenGL.com
 const float PI = 3.14159265359;
@@ -41,6 +35,7 @@ vec3 fresnelSchlick(float cosTheta, vec3 F0)
 {
     return F0 + (1.0 - F0) * pow(clamp(1.0 - cosTheta, 0.0, 1.0), 5.0);
 }
+
 float DistributionGGX(vec3 N, vec3 H, float roughness)
 {
     float a      = roughness*roughness;
@@ -77,16 +72,21 @@ float GeometrySmith(vec3 N, vec3 V, vec3 L, float roughness)
 
 void main()
 {
-   vec3 albedo = vec3(texture(texture_diffuse1, ourTexCoord));
-   float metallic = 1 - texture(texture_metalness1, ourTexCoord).r;
-   float roughness = 1 - texture(texture_roughness1, ourTexCoord).r;
+   vec3 albedo;
+   albedo.r = pow(texture(texture_diffuse1, ourTexCoord).r, 2.2);
+   albedo.g = pow(texture(texture_diffuse1, ourTexCoord).g, 2.2);
+   albedo.b = pow(texture(texture_diffuse1, ourTexCoord).b, 2.2);
+   float roughness = texture(texture_rma1, ourTexCoord).r;
+   float metallic = texture(texture_rma1, ourTexCoord).g;
+   float ao = texture(texture_rma1, ourTexCoord).b;
+
    // Establish ambient lighting
    float ambientStrength = 0.1;
 
    // Establish a temporary hard coded light position
-   vec3 lightPosition = vec3( (sin(tick / 600.0)*2),  1 + sin(tick / 600.0)*2, 2.0);
+   vec3 lightPosition = vec3( (sin(tick / 1000.0)*2),  1 + sin(tick / 600.0)*2, 2.0);
    //vec3 lightColor = vec3(1.0, 1.0, 1.0) - sin(tick / 90);
-   vec3 lightColor = vec3(1.0, 1.0, 1.0);
+   vec3 lightColor  = vec3(23.47, 21.31, 20.79);
 
    // Normal light maths
    vec3 N = normalize(ourNormCoord);

src/Mesh.cpp

@@ -41,10 +41,7 @@ void Mesh::setupMesh() {
 
 void Mesh::draw(ShaderLoader &shader) {
   unsigned int diffuseNr = 1;
-  unsigned int specularNr = 1;
-  unsigned int metalNr = 1;
-  unsigned int roughNr = 1;
-  unsigned int sheenNr = 1;
+  unsigned int rmaNr = 1;
   for (unsigned int i = 0; i < textures.size(); i++) {
     // activate proper texture unit before binding
     glActiveTexture(GL_TEXTURE0 + i);
@@ -53,14 +50,8 @@ void Mesh::draw(ShaderLoader &shader) {
     std::string name = textures[i].type;
     if (name == "texture_diffuse")
       number = std::to_string(diffuseNr++);
-    else if (name == "texture_specular")
-      number = std::to_string(specularNr++);
-    else if (name == "texture_metalness")
-      number = std::to_string(metalNr++);
-    else if (name == "texture_roughness")
-      number = std::to_string(roughNr++);
-    else if (name == "texture_sheen")
-      number = std::to_string(sheenNr++);
+    else if (name == "texture_rma")
+      number = std::to_string(rmaNr++);
 
     shader.setInt((name + number).c_str(), i);
     glBindTexture(GL_TEXTURE_2D, textures[i].id);

src/Model.cpp

@@ -97,18 +97,16 @@ Mesh Model::processMesh(aiMesh *mesh, const aiScene *scene) {
     std::vector<Texture> diffuseMaps = loadMaterialTextures(
         material, aiTextureType_DIFFUSE, "texture_diffuse");
     textures.insert(textures.end(), diffuseMaps.begin(), diffuseMaps.end());
-    std::vector<Texture> specularMaps = loadMaterialTextures(
-        material, aiTextureType_SPECULAR, "texture_specular");
-    textures.insert(textures.end(), specularMaps.begin(), specularMaps.end());
-    std::vector<Texture> metalMaps = loadMaterialTextures(
-        material, aiTextureType_METALNESS, "texture_metalness");
-    textures.insert(textures.end(), metalMaps.begin(), metalMaps.end());
-    std::vector<Texture> roughMaps = loadMaterialTextures(
-        material, aiTextureType_DIFFUSE_ROUGHNESS, "texture_roughness");
-    textures.insert(textures.end(), roughMaps.begin(), roughMaps.end());
-    std::vector<Texture> sheenMaps = loadMaterialTextures(
-        material, aiTextureType_AMBIENT_OCCLUSION, "texture_sheen");
-    textures.insert(textures.end(), sheenMaps.begin(), sheenMaps.end());
+
+    // WARNING: As assimp updates to keep up with obj's mtl format
+    // aiTextureType_sheen may become incorrect. Using sheen because assimp maps
+    // map_Ps to both RMA  and sheen, and doesn't seem to use mtl's map_RMA
+    // anywhere and I can't find an RMA texture type in this version of the
+    // library.
+    // https://github.com/assimp/assimp/commit/19371af6e65608ffc968df646bf20278e6d99414
+    std::vector<Texture> rmaMaps =
+        loadMaterialTextures(material, aiTextureType_SHEEN, "texture_rma");
+    textures.insert(textures.end(), rmaMaps.begin(), rmaMaps.end());
   }
   return Mesh(vertices, indecies, textures);
 }