prepare code for a more dynamic world

CMakeLists.txt

@@ -19,6 +19,7 @@ add_executable(VoxelEngine
     src/Object3D.h
     src/Object3D.cpp
     src/Camera.h
+    src/World.h
 )
 
 # --- Configure GLAD (from your src/ and include/ folders) ---

build.ps1

@@ -0,0 +1,11 @@
+cmake -S . -B build
+cd build
+cmake --build .
+
+cd ..
+cp vendor/lib-vc2022/glfw3.dll build/Debug
+cp -r shaders/ build/Debug
+cp -r objs/ build/Debug
+
+cd build/Debug
+.\VoxelEngine.exe

src/World.h

@@ -0,0 +1,30 @@
+#ifndef WORLD_H
+#define CAMERA_H
+
+#include <unordered_set>
+
+#include <glm/glm.hpp>
+
+// Hash function for glm::ivec3 to use with unordered_set
+namespace std {
+    template <>
+    struct hash<glm::ivec3> {
+        size_t operator()(const glm::ivec3& v) const {
+            // Combine hash values of x, y, z components
+            size_t h1 = hash<int>()(v.x);
+            size_t h2 = hash<int>()(v.y);
+            size_t h3 = hash<int>()(v.z);
+
+            // Use a simple hash combination algorithm
+            return h1 ^ (h2 << 1) ^ (h3 << 2);
+        }
+    };
+}
+
+class World
+{
+  public:
+    std::unordered_set<glm::ivec3> voxels;
+};
+
+#endif WORLD_H

src/main.cpp

@@ -1,17 +1,25 @@
+#include <iostream>
+#include <unordered_set>
+
 #include <glad/glad.h> // Must be included before GLFW
 #include <GLFW/glfw3.h>
-#include <iostream>
-
 #include <glm/glm.hpp>
 
 #include "Shader.h"
 #include "Camera.h"
 #include "Object3D.h"
+#include "World.h"
 
 // Window dimensions
-const unsigned int SCR_WIDTH = 800;
+unsigned int SCR_WIDTH = 800 * 1.5;
-const unsigned int SCR_HEIGHT = 600;
+unsigned int SCR_HEIGHT = 600 * 1.5;
 
+// Jump
+const float JUMP_COOLDOWN = 0.0f;
+const float JUMP_POWER = 10.0f; // Initial Jump Speed
+float last_jump = 0.0f;
+
+// Camera
 const float CAMERA_SPEED = 1.0f;
 const float MAX_CAMERA_SPEED = 2.0f;
 const float LOOK_SENSITIVITY = 0.1f;
@@ -21,12 +29,162 @@ const float Z_NEAR = 0.1f;
 bool WIREFRAME_MODE = true;
 const float FOV = 90.0f;
 
+bool W_pressed, S_pressed, A_pressed, D_pressed = false;
+
 glm::mat4 projection = glm::mat4(1.0f);
 Camera camera = Camera(CAMERA_SPEED, glm::vec3(0.0f, 0.0f, 3.0f));
 
 // Callback function for when the window is resized
-void framebuffer_size_callback(GLFWwindow* window, int width, int height) {
+// glfw: whenever the window size changed (by OS or user resize) this callback function executes
+void framebuffer_size_callback(GLFWwindow* window, int width, int height)
+{
+    // make sure the viewport matches the new window dimensions; note that width and
+    // height will be significantly larger than specified on retina displays.
     glViewport(0, 0, width, height);
+    SCR_WIDTH = width;
+    SCR_HEIGHT = height;
+
+    // Perspective needs to be recalculated on window size change
+    projection = glm::perspective(glm::radians(FOV), (float)SCR_WIDTH / (float)SCR_HEIGHT, Z_NEAR, Z_FAR);
+}
+
+float yaw, pitch = 0;
+bool first_mouse = true;
+bool mouse_lock = true;
+float last_x = 400, last_y = 300;
+
+// Mouse Look
+void mouse_callback(GLFWwindow * window, double xpos, double ypos)
+{
+    float x_offset = xpos - last_x;
+    float y_offset = ypos - last_y;
+    last_x = xpos;
+    last_y = ypos;
+
+    if (first_mouse)
+    {
+        first_mouse = false;
+        return;
+    }
+
+    x_offset *= LOOK_SENSITIVITY;
+    y_offset *= LOOK_SENSITIVITY;
+
+    yaw += x_offset;
+    pitch += y_offset;
+
+    if (pitch > 89.0f)
+        pitch = 89.0f;
+    if (pitch < -89.0f)
+        pitch = -89.0f;
+
+    glm::vec3 direction;
+    direction.x = cos(glm::radians(yaw)) * cos(glm::radians(pitch));
+    direction.y = -sin(glm::radians(pitch));
+    direction.z = sin(glm::radians(yaw)) * cos(glm::radians(pitch));
+    camera.target = glm::normalize(direction);
+}
+
+// process all input: query GLFW whether relevant keys are pressed/released this frame and react accordingly
+void processInput(GLFWwindow *window)
+{
+    float current_time = glfwGetTime();
+
+    if(glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS) {
+        // if (mouse_lock) {
+        //     glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_NORMAL);
+        //     mouse_lock = false;
+        // } else {
+        //     glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_DISABLED);
+        //     mouse_lock = true;
+        // }
+        glfwSetWindowShouldClose(window, true);
+    }
+
+    // ---- Movement ----
+    // Forward / Backward
+    if(glfwGetKey(window, GLFW_KEY_W) == GLFW_PRESS)
+    {
+        camera.forward_velocity = camera.speed * glm::vec3(camera.target.x, 0.0f, camera.target.z);
+        W_pressed = true;
+    }
+
+    if(glfwGetKey(window, GLFW_KEY_S) == GLFW_PRESS)
+    {
+        camera.forward_velocity = -camera.speed * glm::vec3(camera.target.x, 0.0f, camera.target.z);
+        S_pressed = true;
+    }
+
+
+    if(glfwGetKey(window, GLFW_KEY_S) == GLFW_RELEASE && S_pressed)
+    {
+        camera.forward_velocity = glm::vec3(0.0f);
+        S_pressed = false;
+    }
+    if(glfwGetKey(window, GLFW_KEY_W) == GLFW_RELEASE && W_pressed)
+    {
+        camera.forward_velocity = glm::vec3(0.0f);
+        W_pressed = false;
+    }
+
+
+    // Horizontal
+    if(glfwGetKey(window, GLFW_KEY_A) == GLFW_PRESS)
+    {
+        camera.horizontal_velocity = -glm::normalize(glm::cross(glm::vec3(camera.target.x, 0.0f, camera.target.z), camera.worldUp)) * camera.speed;
+        A_pressed = true;
+    }
+    if(glfwGetKey(window, GLFW_KEY_D) == GLFW_PRESS)
+    {
+        camera.horizontal_velocity = glm::normalize(glm::cross(glm::vec3(camera.target.x, 0.0f, camera.target.z), camera.worldUp)) * camera.speed;
+        D_pressed = true;
+    }
+
+
+    if(glfwGetKey(window, GLFW_KEY_A) == GLFW_RELEASE && A_pressed)
+    {
+        camera.horizontal_velocity = glm::vec3(0.0f);
+        A_pressed = false;
+    }
+    if(glfwGetKey(window, GLFW_KEY_D) == GLFW_RELEASE && D_pressed)
+    {
+        camera.horizontal_velocity = glm::vec3(0.0f);
+        D_pressed = false;
+    }
+
+
+    // Jump
+    if(glfwGetKey(window, GLFW_KEY_SPACE) == GLFW_PRESS)
+        // camera.velocity -= glm::normalize(glm::cross(camera.target, glm::normalize(glm::cross(camera.target, camera.worldUp)))) * camera.speed * 0.5f;
+    {
+        if (current_time - last_jump > JUMP_COOLDOWN && camera.position.y == 0)
+        {
+            camera.vertical_velocity.y = JUMP_POWER;
+            last_jump = current_time;
+        }
+    }
+
+    // Sprint
+    if(glfwGetKey(window, GLFW_KEY_LEFT_SHIFT) == GLFW_PRESS)
+        camera.speed = CAMERA_SPEED * 7.5;
+    if(glfwGetKey(window, GLFW_KEY_LEFT_SHIFT) == GLFW_RELEASE)
+        camera.speed = CAMERA_SPEED * 20;
+}
+
+// Draw a cube at some x, y, z
+void draw_cube(glm::ivec3 coords, Shader& shader, unsigned int VAO, size_t indexCount, const glm::mat4& view, const glm::mat4& projection) {
+    // Create model matrix for positioning the cube
+    glm::mat4 model = glm::mat4(1.0f);
+    model = glm::translate(model, glm::vec3(coords));
+
+    // Calculate MVP matrix
+    glm::mat4 mvp = projection * view * model;
+
+    // Set the uniform and draw
+    shader.use();
+    shader.setMat4("u_mvp", mvp);
+    glBindVertexArray(VAO);
+    glDrawElements(GL_TRIANGLES, indexCount, GL_UNSIGNED_INT, nullptr);
 }
 
 int main() {
@@ -61,8 +219,18 @@ int main() {
     // 5. --- Set up Vertex Data and Buffers ---
 
     // Load Cube OBJ
+    World world;
     Object3D cube = Object3D("objs/cube.obj");
 
+    // Place cubes in the world
+    for (int z = 0; z <= 32; z++) {
+        for (int x = 0; x <= 32; x++) {
+            world.voxels.insert(glm::ivec3(x, -1, z));
+        }
+    }
+
+    world.voxels.insert(glm::ivec3(7, 0, 13));
+
     unsigned int VBO, VAO, EBO;
     glGenVertexArrays(1, &VAO); // 1. Create Vertex Array Object (VAO)
     glGenBuffers(1, &VBO);      // 2. Create Vertex Buffer Object (VBO)
@@ -95,26 +263,39 @@ int main() {
     if (WIREFRAME_MODE)
         glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
 
+    // Setup mouse look
+    glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_DISABLED);
+    glfwSetCursorPosCallback(window, mouse_callback);
+
     // Setup projection matrix
     projection = glm::perspective(glm::radians(FOV), (float)SCR_WIDTH / (float)SCR_HEIGHT, Z_NEAR, Z_FAR); // This doesn't need to be recalculated every frame
 
-    glm::mat4 view = camera.getView();
+    glm::mat4 view;
+    double start_time = glfwGetTime();
+    double move_time = glfwGetTime();
 
     // 6. --- The Render Loop ---
     while (!glfwWindowShouldClose(window)) {
         // Input (e.g., close window on ESC)
-        // processInput(window);
+        processInput(window);
-        if (glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS)
-            glfwSetWindowShouldClose(window, true);
 
         glClearColor(0.0f, 0.0f, 0.0f, 1.0f); // Clear screen
         glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // Clear Z-Buffer
 
-        // Draw the triangle
+        view = camera.getView();
-        shader.use();
+
-        shader.setMat4("u_mvp", projection * view);
+        // Draw the World
-        glBindVertexArray(VAO);  // Bind the VAO (our triangle's "recipe")
+        for (glm::ivec3 voxel_pos : world.voxels) {
-        glDrawElements(GL_TRIANGLES, cube.EBO_buffer.size(), GL_UNSIGNED_INT, nullptr); // Draw it!
+            draw_cube(voxel_pos, shader, VAO, cube.EBO_buffer.size(), view, projection);
+        }
+
+        double end_time = glfwGetTime();
+        float time_since_last_move = end_time - move_time;
+        if (time_since_last_move  >= 0.017)
+        {
+            camera.move(time_since_last_move);
+            move_time = end_time;
+        }
 
         // Swap buffers and poll for events
         glfwSwapBuffers(window);