MTL loading, Lots of changes

DEPENDENCIES.md

@@ -0,0 +1,4 @@
+# Dependencies
+- OpenGL, GLEW, GLFW
+- stb_image, stb_image_write
+- microtar (included)

src/kekengine/cpp/engine.cpp

@@ -6,6 +6,12 @@
 #include <GL/glew.h>
 #include <GLFW/glfw3.h>
 #include <glm/gtc/type_ptr.hpp>
+#include <chrono>
+
+#define STB_IMAGE_IMPLEMENTATION
+#define STB_IMAGE_WRITE_IMPLEMENTATION
+#include <stb/stb_image.h>
+#include <stb/stb_image_write.h>
 
 #include "internal.h"
 #include "errordialog.h"
@@ -145,6 +151,9 @@ int init() {
 	glfwSetInputMode(kekData.window, GLFW_CURSOR, GLFW_CURSOR_DISABLED);
 
 	glClearColor(0.1f, 0.3f, 0.1f, 0.0f);
+	//glfwSwapInterval(0);
+
+	stbi_set_flip_vertically_on_load(true);
 
 	kekData.activeCamera = new Camera();
 	kekData.shader = new Shader("shader/mesh/vertex.glsl", "shader/mesh/fragment.glsl");
@@ -154,6 +163,8 @@ int init() {
 
 int start() {
 	while(!glfwWindowShouldClose(kekData.window)) {
+		auto start = std::chrono::high_resolution_clock::now();
+
 		// Clear the screen
 		glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 		glViewport(0, 0, kekData.screenWidth, kekData.screenHeight);
@@ -204,14 +215,17 @@ int start() {
 		glUniformMatrix4fv(glGetUniformLocation(kekData.shader->id, "view"), 1, GL_FALSE, glm::value_ptr(view));
 		glUniformMatrix4fv(glGetUniformLocation(kekData.shader->id, "projection"), 1, GL_FALSE, glm::value_ptr(projection));
 		glUniform3fv(glGetUniformLocation(kekData.shader->id, "cameraPos"), 1, glm::value_ptr(position));
-		glm::mat4 model = glm::mat4(1.0f);
-		glUniformMatrix4fv(glGetUniformLocation(kekData.shader->id, "model"), 1, GL_FALSE, glm::value_ptr(model));
 
 		if(kekData.activeScene) kekData.activeScene->draw(kekData.shader);
 
 		// Swap buffers and poll window events
 		glfwSwapBuffers(kekData.window);
 		glfwPollEvents();
+
+		auto end = std::chrono::high_resolution_clock::now();
+		std::chrono::duration<float> secsTaken = end - start;
+		//std::cout << "FT: " << secsTaken.count() * 1000 << std::endl;
+		//std::cout << "FR: " << (1.0f / secsTaken.count()) << std::endl;
 	}
 
 	return KEK_SUCCESS;

src/kekengine/cpp/gameobject.cpp

@@ -1,5 +1,10 @@
 #include "gameobject.h"
 
+#include <GL/glew.h>
+#include <glm/gtc/type_ptr.hpp>
+
+#include "internal.h"
+
 namespace kek {
 
 GameObject::GameObject() {
@@ -17,6 +22,10 @@ void GameObject::addMesh(Mesh *mesh) {
 }
 
 void GameObject::draw(Shader *shader) {
+	glm::mat4 model = glm::mat4(1.0f);
+	model = glm::translate(model, position) * glm::mat4_cast(rotation);
+	glUniformMatrix4fv(glGetUniformLocation(kekData.shader->id, "model"), 1, GL_FALSE, glm::value_ptr(model));
+
 	for(Mesh *mesh : meshes) {
 		mesh->draw(shader);
 	}

src/kekengine/cpp/mesh.cpp

@@ -12,9 +12,17 @@ Vertex::Vertex(glm::vec3 pos, glm::vec3 normal, glm::vec2 texCoords) {
 	this->texCoords = texCoords;
 }
 
-Mesh::Mesh(std::vector<Vertex> vertices, std::vector<uint32_t> indices) {
+Material::Material(std::shared_ptr<Texture> ambient, std::shared_ptr<Texture> diffuse, std::shared_ptr<Texture> specular, float shininess) {
+	this->ambient = ambient;
+	this->diffuse = diffuse;
+	this->specular = specular;
+	this->shininess = shininess;
+}
+
+Mesh::Mesh(std::vector<Vertex> vertices, std::vector<uint32_t> indices, Material *material) {
 	this->vertices = vertices;
 	this->indices = indices;
+	this->material = material;
 
 	glGenVertexArrays(1, &vao);
 	glGenBuffers(1, &vbo);
@@ -52,6 +60,7 @@ Mesh::~Mesh() {
 	glDeleteBuffers(1, &ebo);
 	glDeleteBuffers(1, &vbo);
 	glDeleteVertexArrays(1, &vao);
+	delete material;
 }
 
 void Mesh::draw(Shader *shader) {
@@ -59,14 +68,19 @@ void Mesh::draw(Shader *shader) {
 	glBindBuffer(GL_ARRAY_BUFFER, vbo);
 	glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, ebo);
 
-	/*if(!light) { // TODO: check if props exist
-		material->diffuse->use(GL_TEXTURE0);
-		glUniform1i(glGetUniformLocation(shader->id, "material.diffuse"), 0);
-
-		material->specular->use(GL_TEXTURE1);
-		glUniform1i(glGetUniformLocation(shader->id, "material.specular"), 1);
+	GLint ambient = glGetUniformLocation(shader->id, "material.ambient");
+	// FIXME: is -1
+	if(ambient != -1) { // Material can be passed to shader
+		material->ambient->use(GL_TEXTURE0);
+		glUniform1i(ambient, 0);
+		material->diffuse->use(GL_TEXTURE1);
+		glUniform1i(glGetUniformLocation(shader->id, "material.diffuse"), 1);
+		material->specular->use(GL_TEXTURE2);
+		glUniform1i(glGetUniformLocation(shader->id, "material.specular"), 2);
 		glUniform1f(glGetUniformLocation(shader->id, "material.shininess"), material->shininess);
-	}*/
+	}else {
+		std::cerr << "oof" << std::endl;
+	}
 
 	// Bind vertices + texture coordinates
 	glDrawElements(GL_TRIANGLES, indices.size(), GL_UNSIGNED_INT, 0);

src/kekengine/cpp/objparser.cpp

@@ -6,6 +6,7 @@
 #include <glm/glm.hpp>
 
 #include "types.h"
+#include "resource.h"
 
 namespace kek::ObjParser {
 
@@ -24,7 +25,9 @@ static bool readFaceVertex(std::istringstream &stream, uint32_t *outVertex, uint
 	return true;
 }
 
-Mesh *parse(MemoryBuffer *buf) {
+Mesh *parseMesh(MemoryBuffer *buf, std::string folderPath) {
+	std::map<std::string, Material *> materials;
+
 	std::vector<glm::vec3> vertexPositions;
 	std::vector<glm::vec3> vertexNormals;
 	std::vector<glm::vec2> vertexTexCoords;
@@ -32,6 +35,8 @@ Mesh *parse(MemoryBuffer *buf) {
 	std::vector<Vertex> vertices;
 	std::vector<uint32_t> indices;
 
+	Material *material = nullptr;
+
 	std::istream stream(buf);
 
 	std::string line;
@@ -68,12 +73,111 @@ Mesh *parse(MemoryBuffer *buf) {
 			indices.push_back(indices.size());
 			vertices.push_back(Vertex(vertexPositions[v3 - 1], vertexNormals[v3N - 1], vertexTexCoords[v3T - 1]));
 			indices.push_back(indices.size());
+		}else if(cmd == "mtllib") {
+			std::string name;
+			str >> name;
+			std::string mtllibPath = folderPath + name;
+
+			std::map<std::string, Material *> mats = loadMaterials(mtllibPath);
+			materials.insert(mats.begin(), mats.end());
+		}else if(cmd == "usemtl") {
+			std::string mtlName;
+			str >> mtlName;
+			auto it = materials.find(mtlName);
+			if(it == materials.end()) {
+				std::cerr << "Invalid material specified: " << mtlName << std::endl;
+				throw std::exception();
+			}
+
+			material = it->second;
 		}else {
-			std::cout << "Ignoring unknown OBJ command: " << cmd << std::endl;
+			std::cout << "Ignoring unknown/unsupported OBJ command: " << cmd << std::endl;
 		}
 	}
 
-	return new Mesh(vertices, indices);
+	for(auto it = materials.begin(); it != materials.end(); it++) {
+		if(it->second != material) delete it->second;
+	}
+
+	if(!material) {
+		std::shared_ptr<Texture> colorTex = Texture::generateColor(glm::vec3(1.0f, 0.0f, 0.0f));
+		material = new Material(colorTex, colorTex, colorTex, 1.0f);
+	}
+
+	return new Mesh(vertices, indices, material);
+}
+
+Mesh *loadMesh(std::string path) {
+	std::size_t n = path.find('/');
+	std::string folderPath = n == std::string::npos ? "" : path.substr(n + 1);
+	MemoryBuffer *buf = Resource::loadResource(path);
+	Mesh *mesh = parseMesh(buf, folderPath);
+	delete buf;
+	return mesh;
+}
+
+std::map<std::string, Material *> parseMaterials(MemoryBuffer *buf, std::string folderPath) {
+	std::map<std::string, Material *> mats;
+
+	std::string name;
+	std::shared_ptr<Texture> ambient;
+	std::shared_ptr<Texture> diffuse;
+	std::shared_ptr<Texture> specular;
+	float shininess = 0.0f;
+
+	std::istream stream(buf);
+
+	std::string line;
+	while(std::getline(stream, line)) {
+		std::istringstream str(line);
+		std::string cmd;
+		str >> cmd;
+
+		if(cmd == "#") continue;
+
+		if(cmd == "newmtl") {
+			if(name.length() > 0) {
+				Material *mat = new Material(ambient, diffuse, specular, shininess);
+				mats.emplace(name, mat);
+			}
+
+			str >> name;
+		}else if(cmd == "Ka") {
+			float r, g, b;
+			str >> r >> g >> b;
+			ambient = Texture::generateColor(glm::vec3(r, g, b));
+		}else if(cmd == "Kd") {
+			float r, g, b;
+			str >> r >> g >> b;
+			diffuse = Texture::generateColor(glm::vec3(r, g, b));
+		}else if(cmd == "Ks") {
+			float r, g, b;
+			str >> r >> g >> b;
+			specular = Texture::generateColor(glm::vec3(r, g, b));
+		}else if(cmd == "Ns") {
+			float s;
+			str >> s;
+			shininess = s;
+		}else {
+			std::cout << "Ignoring unknown/unsupported MTL command: " << cmd << std::endl;
+		}
+	}
+
+	if(name.length() > 0) {
+		Material *mat = new Material(ambient, diffuse, specular, shininess);
+		mats.emplace(name, mat);
+	}
+
+	return mats;
+}
+
+std::map<std::string, Material *> loadMaterials(std::string path) {
+	std::size_t n = path.find('/');
+	std::string folderPath = n == std::string::npos ? "" : path.substr(n + 1);
+	MemoryBuffer *buf = Resource::loadResource(path);
+	std::map<std::string, Material *> mats = parseMaterials(buf, folderPath);
+	delete buf;
+	return mats;
 }
 
 }

src/kekengine/cpp/shader.cpp

@@ -32,6 +32,7 @@ static GLuint compileShader(GLenum type, std::string path) {
 	}
 
 	std::string code = stream.str();
+	std::cout << code << std::endl;
 	delete buf;
 
 	const char *src = code.c_str();

src/kekengine/cpp/texture.cpp

@@ -0,0 +1,83 @@
+#include "texture.h"
+
+#include <stb/stb_image.h>
+#include <stb/stb_image_write.h>
+
+#include "resource.h"
+#include "internal.h"
+
+namespace kek {
+
+static unsigned int allocTexture(unsigned char *data, int width, int height, float borderColor[4]) {
+	GLuint id;
+	glGenTextures(1, &id);
+	glBindTexture(GL_TEXTURE_2D, id);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
+	glTexParameterfv(GL_TEXTURE_2D, GL_TEXTURE_BORDER_COLOR, borderColor);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+	glTexImage2D(GL_TEXTURE_2D, 0, GL_SRGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, data);
+	//glTexImage2DMultisample(GL_TEXTURE_2D_MULTISAMPLE, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, data);
+	glGenerateMipmap(GL_TEXTURE_2D);
+	return id;
+}
+
+Texture::Texture(std::string texturePath) {
+	this->path = texturePath;
+
+	int width, height, nrChannels;
+	MemoryBuffer *buf = Resource::loadResource(texturePath);
+	if(!buf) {
+		std::cout << "Failed to load texture: " << texturePath << std::endl;
+		throw std::exception();
+	}
+
+	unsigned char *data = stbi_load_from_memory((stbi_uc *) buf->buffer, buf->length, &width, &height, &nrChannels, 0);
+	delete buf;
+
+	float borderColor[] = { 1.0f, 0.0f, 1.0f, 1.0f };
+	allocTexture(data, width, height, borderColor);
+
+	stbi_image_free(data);
+}
+
+Texture::Texture(GLuint id) {
+	this->id = id;
+}
+
+Texture::~Texture() {
+	glDeleteTextures(1, &id);
+}
+
+void Texture::use(GLenum texture) {
+	glActiveTexture(texture);
+	glBindTexture(GL_TEXTURE_2D, id);
+}
+
+std::shared_ptr<Texture> Texture::load(std::string texturePath) {
+	std::shared_ptr<Texture> ret;
+
+	auto iter = kekData.loadedTextures.find(texturePath);
+	if(iter != kekData.loadedTextures.end()) ret = iter->second.lock();
+
+	if(!ret) {
+		ret = std::make_shared<Texture>(texturePath);
+		kekData.loadedTextures.emplace(texturePath, ret);
+	}
+
+	return ret;
+}
+
+std::shared_ptr<Texture> Texture::generateColor(glm::vec3 color) {
+	unsigned char *data = (unsigned char *) malloc(3 * sizeof(unsigned char));
+	data[0] = (unsigned char) (color.x * 255);
+	data[1] = (unsigned char) (color.y * 255);
+	data[2] = (unsigned char) (color.z * 255);
+	float borderColor[4] = { color.x, color.y, color.z, 1.0f };
+	GLuint tex = allocTexture(data, 1, 1, borderColor);
+	free(data);
+	return std::make_shared<Texture>(tex);
+}
+
+}

src/kekengine/include/input.h

@@ -1,5 +1,6 @@
 #pragma once
 
+#include <GL/glew.h>
 #include <GLFW/glfw3.h>
 
 #include "utils.h"

src/kekengine/include/internal.h

@@ -1,10 +1,13 @@
 #pragma once
 
+#include <map>
+#include <memory>
+#include <vector>
+
 #include "input.h"
 #include "camera.h"
 #include "scene.h"
-
-#include <map>
+#include "texture.h"
 
 namespace kek {
 
@@ -21,6 +24,8 @@ struct KekData {
 
 	int screenWidth;
 	int screenHeight;
+
+	std::map<std::string, std::weak_ptr<Texture>> loadedTextures;
 };
 
 extern KekData kekData;

src/kekengine/include/mesh.h

@@ -1,11 +1,13 @@
 #pragma once
 
-#include "shader.h"
-
 #include <glm/glm.hpp>
 #include <vector>
 #include <cstdint>
 #include <iostream>
+#include <memory>
+
+#include "shader.h"
+#include "texture.h"
 
 namespace kek {
 
@@ -18,15 +20,28 @@ struct Vertex {
 
 };
 
+struct Material {
+
+public:
+	std::shared_ptr<Texture> ambient;
+	std::shared_ptr<Texture> diffuse;
+	std::shared_ptr<Texture> specular;
+	float shininess;
+
+	Material(std::shared_ptr<Texture> ambient, std::shared_ptr<Texture> diffuse, std::shared_ptr<Texture> specular, float shininess);
+
+};
+
 class Mesh {
 
 public:
 	std::vector<Vertex> vertices;
 	std::vector<uint32_t> indices;
+	Material *material;
 
 	unsigned int vao, vbo, ebo;
 
-	Mesh(std::vector<Vertex> vertices, std::vector<uint32_t> indices);
+	Mesh(std::vector<Vertex> vertices, std::vector<uint32_t> indices, Material *material);
 
 	~Mesh();
 

src/kekengine/include/objparser.h

@@ -1,12 +1,18 @@
 #pragma once
 
-#include <vector>
+#include <map>
 
 #include "types.h"
 #include "mesh.h"
 
 namespace kek::ObjParser {
 
-Mesh *parse(MemoryBuffer *buf);
+Mesh *parseMesh(MemoryBuffer *buf, std::string folderPath);
+
+Mesh *loadMesh(std::string path);
+
+std::map<std::string, Material *> parseMaterials(MemoryBuffer *buf, std::string folderPath);
+
+std::map<std::string, Material *> loadMaterials(std::string path);
 
 }

src/kekengine/include/texture.h

@@ -0,0 +1,33 @@
+#pragma once
+
+#include <GL/glew.h>
+#include <GLFW/glfw3.h>
+#include <glm/glm.hpp>
+
+#include <vector>
+#include <string>
+#include <memory>
+
+namespace kek {
+
+class Texture {
+
+public:
+	GLuint id;
+	std::string path;
+
+	Texture(std::string texturePath);
+
+	Texture(GLuint id);
+
+	~Texture();
+
+	void use(GLenum texture);
+
+	static std::shared_ptr<Texture> load(std::string texturePath);
+
+	static std::shared_ptr<Texture> generateColor(glm::vec3 color);
+
+};
+
+}

src/kekengine/res/shader/include/lightcalc.glsl

@@ -0,0 +1,25 @@
+vec3 calcPointLight(PointLight light, vec3 normal, vec3 fragPos, vec3 viewDir, vec2 texCoord, float shadow) {
+	vec3 lightDir = normalize(light.position - fragPos);
+	vec3 halfwayDir = normalize(lightDir + viewDir);
+
+	// Ambient
+	vec3 ambient = light.ambient * vec3(texture(material.diffuse, texCoord));
+
+	// Diffuse
+	float diff = max(dot(normal, lightDir), 0.0);
+	vec3 diffuse = light.diffuse * diff * vec3(texture(material.diffuse, texCoord));
+
+	// Specular
+	float spec = pow(max(dot(normal, halfwayDir), 0.0), material.shininess);
+	vec3 specular = light.specular * spec * vec3(texture(material.specular, texCoord));
+
+	// Attenuation
+	float dist = length(light.position - fragPos);
+	float attenuation = 1.0 / (light.constant + light.linear * dist + light.quadratic * (dist * dist));
+
+	ambient *= attenuation;
+	diffuse *= attenuation;
+	specular *= attenuation;
+
+	return ambient + (1.0 - shadow) * (diffuse + specular);
+}

src/kekengine/res/shader/include/types.glsl

@@ -1,4 +1,5 @@
 struct Material {
+	sampler2D ambient;
 	sampler2D diffuse;
 	sampler2D specular;
 	float shininess;

src/kekengine/res/shader/mesh/fragment.glsl

@@ -1,19 +1,28 @@
 #version 330 core
 
-!include types.glsl
-
 in VS_OUT {
 	vec3 fragmentPosition;
 	vec2 textureCoordinate;
 	vec3 normal;
 } fs_in;
 
+!include types.glsl
+
+uniform Material material;
+
 uniform vec3 cameraPos;
 
 out vec4 color;
 
+!include lightcalc.glsl
+
 void main() {
-	//vec3 norm = normalize(fs_in.normal);
-	//vec3 viewDir = normalize(cameraPos - fs_in.fragmentPosition);
-	color = length(fs_in.fragmentPosition) / 2 * vec4(1.0);
+	vec3 norm = normalize(fs_in.normal);
+	vec3 viewDir = normalize(cameraPos - fs_in.fragmentPosition);
+	//color = length(fs_in.fragmentPosition) / 2 * vec4(1.0);
+	//color = vec4(norm, 1.0);
+
+	color = texture(material.diffuse, fs_in.textureCoordinate);
+
+	//PointLight light = {};
 }

src/kekgame/cpp/kekgame.cpp

@@ -10,7 +10,7 @@ int main(int argc, char **argv) {
 	Engine::init();
 
 	MemoryBuffer *buf = Resource::loadResource("object/sphere/Sphere.obj");
-	Mesh *mesh = ObjParser::parse(buf);
+	Mesh *mesh = ObjParser::parseMesh(buf, "object/sphere/");
 	delete buf;
 
 	GameObject *test = new GameObject();
@@ -18,6 +18,20 @@ int main(int argc, char **argv) {
 
 	Scene *scene = new Scene();
 	scene->addObject(test);
+
+	MemoryBuffer *buf2 = Resource::loadResource("object/cube_colored/Cube.obj");
+	Mesh *mesh2 = ObjParser::parseMesh(buf2, "object/cube_colored/");
+	delete buf2;
+
+	for(int i = 0; i < 1; i++) {
+		GameObject *test2 = new GameObject();
+		test2->addMesh(new Mesh(mesh2->vertices, mesh2->indices, mesh2->material));
+		test2->moveTo(glm::vec3(0.0f, 5.0f, 3 * i));
+		scene->addObject(test2);
+	}
+
+	delete mesh2;
+
 	Engine::setActiveScene(scene);
 
 	Engine::start();

src/kekgame/res/object/cube_colored/Cube.mtl

@@ -0,0 +1,12 @@
+# Blender 3.3.0 MTL File: 'None'
+# www.blender.org
+
+newmtl Material
+Ns 250.000000
+Ka 1.000000 1.000000 1.000000
+Kd 0.071425 0.000000 0.800000
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.450000
+d 1.000000
+illum 2

src/kekgame/res/object/cube_colored/Cube.obj

@@ -0,0 +1,46 @@
+# Blender 3.3.0
+# www.blender.org
+mtllib Cube.mtl
+o Cube
+v 1.000000 1.000000 -1.000000
+v 1.000000 -1.000000 -1.000000
+v 1.000000 1.000000 1.000000
+v 1.000000 -1.000000 1.000000
+v -1.000000 1.000000 -1.000000
+v -1.000000 -1.000000 -1.000000
+v -1.000000 1.000000 1.000000
+v -1.000000 -1.000000 1.000000
+vn -0.0000 1.0000 -0.0000
+vn -0.0000 -0.0000 1.0000
+vn -1.0000 -0.0000 -0.0000
+vn -0.0000 -1.0000 -0.0000
+vn 1.0000 -0.0000 -0.0000
+vn -0.0000 -0.0000 -1.0000
+vt 0.625000 0.500000
+vt 0.375000 0.500000
+vt 0.625000 0.750000
+vt 0.375000 0.750000
+vt 0.875000 0.500000
+vt 0.625000 0.250000
+vt 0.125000 0.500000
+vt 0.375000 0.250000
+vt 0.875000 0.750000
+vt 0.625000 1.000000
+vt 0.625000 0.000000
+vt 0.375000 0.000000
+vt 0.375000 1.000000
+vt 0.125000 0.750000
+s 0
+usemtl Material
+f 5/5/1 3/3/1 1/1/1
+f 3/3/2 8/13/2 4/4/2
+f 7/11/3 6/8/3 8/12/3
+f 2/2/4 8/14/4 6/7/4
+f 1/1/5 4/4/5 2/2/5
+f 5/6/6 2/2/6 6/8/6
+f 5/5/1 7/9/1 3/3/1
+f 3/3/2 7/10/2 8/13/2
+f 7/11/3 5/6/3 6/8/3
+f 2/2/4 4/4/4 8/14/4
+f 1/1/5 3/3/5 4/4/5
+f 5/6/6 1/1/6 2/2/6