Add OpenGL test project with backpack model and textures

tests/OpenGL/main.cpp

@@ -14,6 +14,7 @@
 #include <glm/glm.hpp>
 #include <glm/gtc/matrix_transform.hpp>
 #include <glm/gtc/type_ptr.hpp>
+#include <windows.h>
 
 const unsigned int SCR_WIDTH = 800;
 const unsigned int SCR_HEIGHT = 600;
@@ -35,6 +36,8 @@ class Shader
 public:
 	unsigned int ID;
 
+	Shader() : ID(0) {}
+
 	Shader(const char* vertexPath, const char* fragmentPath, const char* geometryPath = nullptr)
 	{
 		std::string vertexCode;
@@ -222,28 +225,51 @@ public:
 		setupMesh();
 	}
 
+	unsigned int defaultTexture = 0;
+	
 	void Draw(Shader* shader)
 	{
+		static unsigned int defaultTex = 0;
+		static bool defaultTexCreated = false;
+		if (!defaultTexCreated) {
+			glGenTextures(1, &defaultTex);
+			unsigned char white[] = {200, 200, 200, 255};
+			glBindTexture(GL_TEXTURE_2D, defaultTex);
+			glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 1, 1, 0, GL_RGBA, GL_UNSIGNED_BYTE, white);
+			glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+			glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+			defaultTexCreated = true;
+		}
+
 		unsigned int diffuseNr = 1;
 		unsigned int specularNr = 1;
 		unsigned int normalNr = 1;
 		unsigned int heightNr = 1;
-		for (unsigned int i = 0; i < textures.size(); i++)
-		{
-			glActiveTexture(GL_TEXTURE0 + i);
-			std::string number;
-			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_normal")
-				number = std::to_string(normalNr++);
-			else if (name == "texture_height")
-				number = std::to_string(heightNr++);
 		
-			glUniform1i(glGetUniformLocation(shader->ID, ("material." + name + number).c_str()), i);
-			glBindTexture(GL_TEXTURE_2D, textures[i].id);
+		if (textures.size() == 0) {
+			glActiveTexture(GL_TEXTURE0);
+			glUniform1i(glGetUniformLocation(shader->ID, "material.texture_diffuse1"), 0);
+			glBindTexture(GL_TEXTURE_2D, defaultTex);
+		}
+		else
+		{
+			for (unsigned int i = 0; i < textures.size(); i++)
+			{
+				glActiveTexture(GL_TEXTURE0 + i);
+				std::string number;
+				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_normal")
+					number = std::to_string(normalNr++);
+				else if (name == "texture_height")
+					number = std::to_string(heightNr++);
+
+				glUniform1i(glGetUniformLocation(shader->ID, ("material." + name + number).c_str()), i);
+				glBindTexture(GL_TEXTURE_2D, textures[i].id);
+			}
 		}
 
 		glBindVertexArray(VAO);
@@ -300,6 +326,7 @@ unsigned int TextureFromFile(const char* path, const std::string& directory, boo
 	unsigned char* data = stbi_load(filename.c_str(), &width, &height, &nrComponents, 0);
 	if (data)
 	{
+		std::cout << "Loaded texture: " << filename << " (" << width << "x" << height << ")" << std::endl;
 		GLenum format;
 		if (nrComponents == 1)
 			format = GL_RED;
@@ -321,8 +348,26 @@ unsigned int TextureFromFile(const char* path, const std::string& directory, boo
 	}
 	else
 	{
-		std::cout << "Texture failed to load at path: " << path << std::endl;
-		stbi_image_free(data);
+		std::cout << "Texture not found: " << filename << ", trying earth_d.jpg" << std::endl;
+		std::string fallback = directory + "/earth_d.jpg";
+		data = stbi_load(fallback.c_str(), &width, &height, &nrComponents, 0);
+		if (data) {
+			std::cout << "Loaded fallback: " << fallback << " (" << width << "x" << height << ")" << std::endl;
+			GLenum format = nrComponents == 4 ? GL_RGBA : GL_RGB;
+			glBindTexture(GL_TEXTURE_2D, textureID);
+			glTexImage2D(GL_TEXTURE_2D, 0, format, width, height, 0, format, GL_UNSIGNED_BYTE, data);
+			glGenerateMipmap(GL_TEXTURE_2D);
+			glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+			glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+			stbi_image_free(data);
+		} else {
+			std::cout << "Fallback also failed, using white" << std::endl;
+			unsigned char white[] = {200, 200, 200, 255};
+			glBindTexture(GL_TEXTURE_2D, textureID);
+			glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 1, 1, 0, GL_RGBA, GL_UNSIGNED_BYTE, white);
+			glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+			glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+		}
 	}
 
 	return textureID;
@@ -673,36 +718,48 @@ void framebuffer_size_callback(GLFWwindow* window, int width, int height)
 
 void Initialize()
 {
-	camera = new Camera(glm::vec3(-1, 0, 3), 0, 0);
+	char exePath[MAX_PATH];
+	GetModuleFileNameA(NULL, exePath, MAX_PATH);
+	std::string exeDir = std::string(exePath);
+	exeDir = exeDir.substr(0, exeDir.find_last_of("\\/"));
+	
+	SetCurrentDirectoryA(exeDir.c_str());
+	
+	std::cout << "Working directory: " << exeDir << std::endl;
+	
+	camera = new Camera(glm::vec3(0, 0, 3), 0, 0);
+	std::cout << "Loading model..." << std::endl;
 	model = new Model("res/models/backpack/backpack.obj");
+	std::cout << "Model loaded, meshes: " << model->meshes.size() << std::endl;
+	std::cout << "Textures loaded: " << model->textures_loaded.size() << std::endl;
 	shader = new Shader("Shaders/vertexshader.glsl", "Shaders/fragmentshader.glsl");
+	std::cout << "Shader loaded" << std::endl;
 	glEnable(GL_DEPTH_TEST);
+	glDisable(GL_CULL_FACE);
 }
 
 void Render()
 {
-	glClearColor(0, 0, 0, 1.0f);
+	glClearColor(0.1f, 0.1f, 0.1f, 1.0f);
 	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 
 	shader->use();
-	Transform();
+	
+	glm::mat4 projection = glm::perspective(glm::radians(45.0f), (float)SCR_WIDTH / (float)SCR_HEIGHT, 0.1f, 100.0f);
+	glm::mat4 modelMat = glm::mat4(1.0f);
+	glm::mat4 view = glm::lookAt(glm::vec3(0, 0, 3), glm::vec3(0, 0, 0), glm::vec3(0, 1, 0));
+
+	shader->setMat4("view", view);
+	shader->setMat4("model", modelMat);
+	shader->setMat4("projection", projection);
+	shader->setVec3("viewPos", glm::vec3(0, 0, 3));
 
 	shader->setFloat("material.shininess", 32.0f);
-
 	shader->setVec3("dirLight.direction", 0.0f, -1.0f, 0.0f);
-	shader->setVec3("dirLight.ambient", 0.1f, 0.1f, 0.1f);
-	shader->setVec3("dirLight.diffuse", 0.4f, 0.4f, 0.4f);
+	shader->setVec3("dirLight.ambient", 0.3f, 0.3f, 0.3f);
+	shader->setVec3("dirLight.diffuse", 0.8f, 0.8f, 0.8f);
 	shader->setVec3("dirLight.specular", 0.5f, 0.5f, 0.5f);
-
-	shader->setInt("PointLightNum", 3);
-
-	shader->setVec3("pointLights[0].position", glm::vec3(0.0f, -1.0f, 0.0f));
-	shader->setVec3("pointLights[0].ambient", 0.05f, 0.05f, 0.05f);
-	shader->setVec3("pointLights[0].diffuse", 0.8f, 0.8f, 0.8f);
-	shader->setVec3("pointLights[0].specular", 1.0f, 1.0f, 1.0f);
-	shader->setFloat("pointLights[0].constant", 1.0f);
-	shader->setFloat("pointLights[0].linear", 0.09f);
-	shader->setFloat("pointLights[0].quadratic", 0.032f);
+	shader->setInt("PointLightNum", 0);
 
 	model->Draw(shader);
 }
@@ -710,13 +767,11 @@ void Render()
 void Transform()
 {
 	glm::mat4 projection = glm::perspective(glm::radians(45.0f), (float)SCR_WIDTH / (float)SCR_HEIGHT, 0.1f, 100.0f);
-	origine = glm::rotate(origine, glm::radians(-0.01f), glm::vec3(1.0f, 1.0f, 1.0f));
-	glm::mat4 modelMat = origine;
-	glm::mat4 cameraTrans = camera->GetTrans();
-	glm::mat4 view = glm::inverse(cameraTrans);
+	glm::mat4 modelMat = glm::mat4(1.0f);
+	glm::mat4 view = glm::lookAt(glm::vec3(0, 0, 3), glm::vec3(0, 0, 0), glm::vec3(0, 1, 0));
 
 	shader->setMat4("view", view);
 	shader->setMat4("model", modelMat);
 	shader->setMat4("projection", projection);
-	shader->setVec3("viewPos", camera->GetPos());
+	shader->setVec3("viewPos", glm::vec3(0, 0, 3));
 }

tests/OpenGL/res/models/backpack/backpack.mtl

@@ -0,0 +1,16 @@
+# Blender MTL File: 'None'
+# Material Count: 1
+
+newmtl Scene_-_Root
+Ns 225.000000
+Ka 1.000000 1.000000 1.000000
+Kd 0.800000 0.800000 0.800000
+Ks 0.500000 0.500000 0.500000
+Ke 0.0 0.0 0.0
+Ni 1.450000
+d 1.000000
+illum 2
+map_Kd diffuse.jpg
+map_Bump normal.png
+map_Ks specular.jpg
+

tests/OpenGL/res/models/backpack/source_attribution.txt

@@ -0,0 +1,3 @@
+Model by Berk Gedik, from: https://sketchfab.com/3d-models/survival-guitar-backpack-low-poly-799f8c4511f84fab8c3f12887f7e6b36
+
+Modified material assignment (Joey de Vries) for easier load in OpenGL model loading chapter, and renamed albedo to diffuse and metallic to specular to match non-PBR lighting setup.