NormalMaps Working and started work on specular maps.

src/Model.cpp

@@ -22,6 +22,8 @@ Model::Model(OBJ &obj, ResourceManager* rm)
 			auto texture = std::shared_ptr<Texture>(rm->Load<Texture>("Texture", currentMaterial->DiffuseTexture.FileName));
 			// TODO: Load normal map
 			std::shared_ptr<Texture> normalMap = nullptr;
+			if (!currentMaterial->NormalMap.FileName.empty())
+				normalMap = std::shared_ptr<Texture>(rm->Load<Texture>("Texture", currentMaterial->NormalMap.FileName));
 			// Load specular map
 			std::shared_ptr<Texture> specularMap = nullptr;
 			if (!currentMaterial->SpecularMap.FileName.empty())
@@ -63,7 +65,9 @@ Model::Model(OBJ &obj, ResourceManager* rm)
 
 	if (Vertices.size() > 0)
 	{
-		CreateBuffers(Vertices, Normals, TextureCoords);
+		CreateTangents();
+		getSimilarVertexIndex();
+		CreateBuffers(Vertices, Normals, TangentNormals, BiTangentNormals, TextureCoords);
 	}
 	else
 	{
@@ -71,7 +75,7 @@ Model::Model(OBJ &obj, ResourceManager* rm)
 	}
 }
 
-void Model::CreateBuffers( std::vector<glm::vec3> vertices, std::vector<glm::vec3> normals, std::vector<glm::vec2>textureCoords)
+void Model::CreateBuffers( std::vector<glm::vec3> vertices, std::vector<glm::vec3> normals, std::vector<glm::vec3> tangents, std::vector<glm::vec3> biTangents, std::vector<glm::vec2>textureCoords)
 {
 
 	LOG_INFO("Generating VertexBuffer");
@@ -100,6 +104,32 @@ void Model::CreateBuffers( std::vector<glm::vec3> vertices, std::vector<glm::vec
 		LOG_WARNING("Created empty normal buffer!");
 	}
 
+	LOG_INFO("Generating TangentNormalsBuffer");
+	glGenBuffers(1, &TangentNormalsBuffer);
+	if (tangents.size() > 0)
+	{
+		glBindBuffer(GL_ARRAY_BUFFER, TangentNormalsBuffer);
+		glBufferData(GL_ARRAY_BUFFER, tangents.size() * sizeof(glm::vec3), &tangents[0], GL_STATIC_DRAW);
+		GLERROR("GLEW: BufferFail, TangentNormalsBuffer");
+	}
+	else
+	{
+		LOG_WARNING("Created empty tangent buffer!");
+	}
+
+	LOG_INFO("Generating BiTangentNormalsBuffer");
+	glGenBuffers(1, &BiTangentNormalsBuffer);
+	if (biTangents.size() > 0)
+	{
+		glBindBuffer(GL_ARRAY_BUFFER, BiTangentNormalsBuffer);
+		glBufferData(GL_ARRAY_BUFFER, biTangents.size() * sizeof(glm::vec3), &biTangents[0], GL_STATIC_DRAW);
+		GLERROR("GLEW: BufferFail, BiTangentNormalsBuffer");
+	}
+	else
+	{
+		LOG_WARNING("Created empty biTangent buffer!");
+	}
+
 
 	LOG_INFO("Generating textureCoordBuffer");
 	glGenBuffers(1, &TextureCoordBuffer);
@@ -130,10 +160,94 @@ void Model::CreateBuffers( std::vector<glm::vec3> vertices, std::vector<glm::vec
 	glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, 0, 0);
 	GLERROR("GLEW: BufferFail5");
 
+	glBindBuffer(GL_ARRAY_BUFFER, TangentNormalsBuffer);
+	glVertexAttribPointer(3, 3, GL_FLOAT, GL_FALSE, 0, 0);
+	GLERROR("GLEW: BufferFail5");
+
+	glBindBuffer(GL_ARRAY_BUFFER, BiTangentNormalsBuffer);
+	glVertexAttribPointer(4, 3, GL_FLOAT, GL_FALSE, 0, 0);
+	GLERROR("GLEW: BufferFail5");
+
 	glEnableVertexAttribArray(0);
 	glEnableVertexAttribArray(1);
 	glEnableVertexAttribArray(2);
+	glEnableVertexAttribArray(3);
+	glEnableVertexAttribArray(4);
 	GLERROR("GLEW: BufferFail5");
 }
 
+bool Model::IsNear( float v1, float v2 )
+{
+	return fabs(v1 - v2) < 0.01f;
+}
+
+void Model::getSimilarVertexIndex()
+{
+	for(int i = 0; i < Vertices.size(); i++)
+	{
+		for(int t = 0; t < Vertices.size(); t++)
+		{
+			if(i != t)
+			{
+				if(IsNear(Vertices[i].x, Vertices[t].x)
+					& IsNear(Vertices[i].y, Vertices[t].y)
+					& IsNear(Vertices[i].z, Vertices[t].z)
+					)
+				{
+					glm::vec3 tempNormal, tempTangent, tempBiTangent;
+
+					tempNormal = glm::normalize(Normals[i] + Normals[t]);
+					tempTangent = glm::normalize(TangentNormals[i] + TangentNormals[t]);
+					tempBiTangent = glm::normalize(BiTangentNormals[i] + BiTangentNormals[t]);
+
+					Normals[i] = tempNormal;
+					Normals[t] = tempNormal;
+
+					TangentNormals[i] = tempTangent;
+					TangentNormals[t] = tempTangent;
+
+					BiTangentNormals[i] = tempBiTangent;
+					BiTangentNormals[t] = tempBiTangent;
+				}
+			}
+		}
+	}
+}
+
+void Model::CreateTangents()
+{
+	for(int i = 0; i < Vertices.size(); i += 3)
+	{
+		glm::vec3 v0 = Vertices[i];
+		glm::vec3 v1 = Vertices[i+1];
+		glm::vec3 v2 = Vertices[i+2];
+
+		glm::vec2 uv0 = TextureCoords[i];
+		glm::vec2 uv1 = TextureCoords[i+1];
+		glm::vec2 uv2 = TextureCoords[i+2];
+
+		//Calculate the edge of the triangle
+		glm::vec3 edge1 = v1-v0;
+		glm::vec3 edge2 = v2-v0;
+
+		glm::vec2 deltaUV1 = uv1 - uv0;
+		glm::vec2 deltaUV2 = uv2 - uv0;
+
+		float r = 1.0f / (deltaUV1.x * deltaUV2.y - deltaUV1.y * deltaUV2.x);
+		glm::vec3 tangent, biTangent;
+
+		tangent = (edge1 * deltaUV2.y - edge2 * deltaUV1.y) * r;
+		biTangent = (edge2 * deltaUV1.x - edge1 * deltaUV2.x) * r;
+
+		TangentNormals.push_back(tangent);
+		TangentNormals.push_back(tangent);
+		TangentNormals.push_back(tangent);
+
+		BiTangentNormals.push_back(biTangent);
+		BiTangentNormals.push_back(biTangent);
+		BiTangentNormals.push_back(biTangent);
+	}
+}
+
+