Player's position is reset when close to ghosts

CLAUDE.md

@@ -0,0 +1,46 @@
+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## Build Commands
+
+- **Build the game**: `make`
+- **Clean build artifacts**: `make clean`
+- **Run the game**: `./ghostland`
+
+## Architecture Overview
+
+This is a C++ OpenGL 3D game called "ghostland-game" - a continuation of a previous Go-based project. The player navigates a maze-like environment while being pursued by ghosts.
+
+### Core Components
+
+- **ghostland.cpp**: Main game loop, OpenGL setup, window management, and input handling
+- **Player**: First-person camera system with mouse look, movement physics (including jumping), and flashlight mechanics
+- **Ghost**: Enemy entities that move autonomously within defined boundaries and face the player
+- **Shader system**: OpenGL shader loading and uniform management for different rendering passes
+- **Text rendering**: FreeType-based text rendering system for UI elements like FPS display
+- **Collision detection**: Ray-triangle intersection testing for wall collisions
+
+### Key Systems
+
+- **Maze loading**: The `maze.txt` file contains vertex data for walls parsed at runtime
+- **Lighting**: Dynamic lighting system with player-controlled flashlight that responds to mouse movement
+- **Rendering pipeline**: Separate shaders for different object types (walls, ghosts, text, trails)
+- **Physics**: Simple gravity-based jumping with collision detection against maze geometry
+
+### Dependencies
+
+- OpenGL 3.3+ with GLAD loader
+- GLFW for window management and input
+- GLM for math operations
+- FreeType for text rendering
+- stb_image for texture loading
+
+### File Structure
+
+- Header files (.h) define class interfaces
+- Implementation files (.cpp) contain the logic
+- Shader files (.glsl) define rendering programs
+- Object files (.o) are generated during build
+- `maze.txt` contains level geometry data
+- `fonts/` contains TrueType fonts for text rendering

Makefile

@@ -3,8 +3,8 @@ CFLAGS := -std=c++17 -O3
 LDFLAGS := -ldl -lglfw
 INCLUDES := -I/usr/include/freetype2/ -I/usr/include/libpng16
 
-ghostland: glad.o ghostland.o stb_image.o collisions.o player.o shader.o ghost.o text.o
-	$(CC) -o ghostland glad.o ghostland.o stb_image.o collisions.o player.o shader.o ghost.o text.o /usr/lib/x86_64-linux-gnu/libfreetype.so $(LDFLAGS) $(CFLAGS)
+ghostland: glad.o ghostland.o stb_image.o collisions.o player.o shader.o ghost.o text.o config.o
+	$(CC) -o ghostland glad.o ghostland.o stb_image.o collisions.o player.o shader.o ghost.o text.o config.o /usr/lib/x86_64-linux-gnu/libfreetype.so $(LDFLAGS) $(CFLAGS)
 
 glad.o: glad.c
 	$(CC) -c -o glad.o glad.c $(CFLAGS)
@@ -30,5 +30,8 @@ ghost.o: ghost.cpp ghost.h
 text.o: text.cpp text.h
 	$(CC) -c -o text.o text.cpp $(CFLAGS) $(INCLUDES)
 
+config.o: config.cpp config.h
+	$(CC) -c -o config.o config.cpp $(CFLAGS)
+
 clean:
 	rm -f *.o ghostland

config.cpp

@@ -0,0 +1,103 @@
+#include "config.h"
+#include <fstream>
+#include <iostream>
+#include <sstream>
+
+std::map<std::string, std::string> Config::values;
+
+bool Config::loadFromFile(const std::string& filename) {
+    std::ifstream file(filename);
+    if (!file.is_open()) {
+        std::cout << "Warning: Could not open config file: " << filename << std::endl;
+        return false;
+    }
+    
+    std::string line;
+    while (std::getline(file, line)) {
+        std::string key, value;
+        if (parseJsonValue(line, key, value)) {
+            values[key] = value;
+        }
+    }
+    
+    file.close();
+    std::cout << "Loaded " << values.size() << " config values from " << filename << std::endl;
+    return true;
+}
+
+float Config::getFloat(const std::string& key, float defaultValue) {
+    auto it = values.find(key);
+    if (it != values.end()) {
+        try {
+            return std::stof(it->second);
+        } catch (const std::exception& e) {
+            std::cout << "Warning: Invalid float value for key '" << key << "': " << it->second << std::endl;
+        }
+    }
+    return defaultValue;
+}
+
+int Config::getInt(const std::string& key, int defaultValue) {
+    auto it = values.find(key);
+    if (it != values.end()) {
+        try {
+            return std::stoi(it->second);
+        } catch (const std::exception& e) {
+            std::cout << "Warning: Invalid int value for key '" << key << "': " << it->second << std::endl;
+        }
+    }
+    return defaultValue;
+}
+
+std::string Config::getString(const std::string& key, const std::string& defaultValue) {
+    auto it = values.find(key);
+    if (it != values.end()) {
+        return it->second;
+    }
+    return defaultValue;
+}
+
+std::string Config::trim(const std::string& str) {
+    size_t start = str.find_first_not_of(" \t\r\n");
+    if (start == std::string::npos) return "";
+    size_t end = str.find_last_not_of(" \t\r\n");
+    return str.substr(start, end - start + 1);
+}
+
+bool Config::parseJsonValue(const std::string& line, std::string& key, std::string& value) {
+    std::string trimmed = trim(line);
+    
+    // Skip empty lines, comments, and structural characters
+    if (trimmed.empty() || trimmed[0] == '{' || trimmed[0] == '}' || trimmed[0] == '/' || trimmed[0] == '*') {
+        return false;
+    }
+    
+    // Look for key-value pair: "key": value
+    size_t colonPos = trimmed.find(':');
+    if (colonPos == std::string::npos) {
+        return false;
+    }
+    
+    // Extract key (remove quotes and whitespace)
+    std::string rawKey = trim(trimmed.substr(0, colonPos));
+    if (rawKey.length() >= 2 && rawKey[0] == '"' && rawKey[rawKey.length()-1] == '"') {
+        key = rawKey.substr(1, rawKey.length()-2);
+    } else {
+        key = rawKey;
+    }
+    
+    // Extract value (remove quotes, whitespace, and trailing comma)
+    std::string rawValue = trim(trimmed.substr(colonPos + 1));
+    if (!rawValue.empty() && rawValue.back() == ',') {
+        rawValue.pop_back();
+        rawValue = trim(rawValue);
+    }
+    
+    if (rawValue.length() >= 2 && rawValue[0] == '"' && rawValue[rawValue.length()-1] == '"') {
+        value = rawValue.substr(1, rawValue.length()-2);
+    } else {
+        value = rawValue;
+    }
+    
+    return !key.empty();
+}

config.h

@@ -0,0 +1,20 @@
+#ifndef CONFIG_H
+#define CONFIG_H
+
+#include <string>
+#include <map>
+
+class Config {
+public:
+    static bool loadFromFile(const std::string& filename);
+    static float getFloat(const std::string& key, float defaultValue);
+    static int getInt(const std::string& key, int defaultValue);
+    static std::string getString(const std::string& key, const std::string& defaultValue);
+    
+private:
+    static std::map<std::string, std::string> values;
+    static std::string trim(const std::string& str);
+    static bool parseJsonValue(const std::string& line, std::string& key, std::string& value);
+};
+
+#endif

ghost.cpp

@@ -111,3 +111,15 @@ float rand_float(float rmin, float rmax) {
 glm::vec3 Ghost::get_pos() const {
     return pos;
 }
+
+void Ghost::reverse_direction_from_position(glm::vec3 target_pos) {
+    // Calculate direction from target_pos to ghost position
+    glm::vec3 direction = pos - target_pos;
+    // Set yawr to point directly away from target_pos
+    yawr = atan2(direction.x, direction.z);
+}
+
+void Ghost::regenerate_position() {
+    pos.x = rand_float(xmin, xmax);
+    pos.z = rand_float(zmin, zmax);
+}

ghost.h

@@ -9,6 +9,8 @@ class Ghost {
         void apply_movement(float curr_time, float timed);
         glm::mat4 get_model(glm::vec3 &camera_pos);
         glm::vec3 get_pos() const;
+        void reverse_direction_from_position(glm::vec3 target_pos);
+        void regenerate_position();
 
     private:
         int ghost_id;

ghostland.cpp

@@ -20,6 +20,7 @@
 #include "shader.h"
 #include "ghost.h"
 #include "text.h"
+#include "config.h"
 
 void framebuffer_size_callback(GLFWwindow* window, int width, int height);
 void mouse_callback(GLFWwindow* window, double xpos, double ypos);
@@ -38,7 +39,7 @@ bool first_frame = false;
 float timed = 0.0f;
 float last_frame = 0.0f;
 
-float camera_speed = 10.0f;
+float camera_speed = 20.0f;
 
 const char *projectionC = "projection";
 const char *viewC = "view";
@@ -59,12 +60,18 @@ const char *specularC = "light.specular";
 int num_walls;
 float *wall_vertices;
 
-int trailmax = 1800;
+int trailmax = 500;
 
 int main(int argc, char *argv[]) {
 
     int success;
     glm::vec3 position;
+    glm::vec3 start_position;
+    float start_yaw;
+
+    // Load configuration
+    Config::loadFromFile("ghostland.json");
+    camera_speed = Config::getFloat("camera_speed", camera_speed);
 
     FILE *fp = fopen("maze.txt", "r");
     float yaw;
@@ -72,6 +79,8 @@ int main(int argc, char *argv[]) {
         printf("1st fscanf failed.\n");
         return -1;
     }
+    start_position = position;
+    start_yaw = yaw;
     player = new Player(position, yaw);
     if (fscanf(fp, "%d\n", &num_walls) == EOF) {
         printf("2nd fscanf failed.\n");
@@ -151,8 +160,11 @@ int main(int argc, char *argv[]) {
 
     WINDOWWIDTH = monitor_mode->width;
     WINDOWHEIGHT = monitor_mode->height;
+    //WINDOWWIDTH = 1280;
+    //WINDOWHEIGHT = 960;
 
     GLFWwindow* window = glfwCreateWindow(WINDOWWIDTH, WINDOWHEIGHT, "Ghostland!", monitor, NULL);
+    //GLFWwindow* window = glfwCreateWindow(WINDOWWIDTH, WINDOWHEIGHT, "Ghostland!", NULL, NULL);
     if (window == NULL)
     {
         printf("Failed to create GLFW window.\n");
@@ -340,7 +352,14 @@ int main(int argc, char *argv[]) {
 
     std::vector<Ghost *> ghosts;
     for (int i = 0; i < 800; i++) {
-        ghosts.push_back(new Ghost(xmin_wall, xmax_wall, zmin_wall, zmax_wall));
+        Ghost *ghost = new Ghost(xmin_wall, xmax_wall, zmin_wall, zmax_wall);
+        
+        // Ensure ghost is not within 30.0 units of start_position
+        while (glm::length(ghost->get_pos() - start_position) <= 30.0f) {
+            ghost->regenerate_position();
+        }
+        
+        ghosts.push_back(ghost);
     }
 
     player->mouse_callback(window, WINDOWWIDTH/2, WINDOWHEIGHT);
@@ -409,6 +428,37 @@ int main(int argc, char *argv[]) {
         glm::vec3 light_front = player->get_light_front();
         //printf("light_pos: (%f, %f, %f)\n", light_front.x, light_front.y, light_front.z);
 
+        // Sort ghosts by distance to player for optimization
+        glm::vec3 player_pos = player->get_pos();
+        struct {
+            bool operator()(const Ghost *a, const Ghost *b) const {
+                glm::vec3 a_diff, b_diff;
+                a_diff = player->get_pos() - a->get_pos();
+                b_diff = player->get_pos() - b->get_pos();
+                float a_dist, b_dist;
+                a_dist = glm::length(a_diff);
+                b_dist = glm::length(b_diff);
+                return a_dist < b_dist;
+            }
+        } ghost_compare;
+        std::partial_sort(ghosts.begin(), ghosts.begin() + ghosts.size() / 5, ghosts.end(), ghost_compare);
+        
+        // Calculate nearest ghost distance (first ghost is now closest)
+        float nearest_ghost_distance = glm::length(ghosts[0]->get_pos() - player_pos);
+        
+        // Interpolate flashlight color based on nearest ghost distance
+        // At 30.0+ units: (0.61, 0.60, 0.59) - normal color
+        // At 10.0 units: (0.99, 0.60, 0.59) - red shift
+        float color_factor = 1.0f;
+        if (nearest_ghost_distance < 30.0f) {
+            color_factor = (nearest_ghost_distance - 10.0f) / (30.0f - 10.0f);
+            color_factor = glm::clamp(color_factor, 0.0f, 1.0f);
+        }
+        
+        glm::vec3 normal_color = glm::vec3(0.61f, 0.60f, 0.59f);
+        glm::vec3 danger_color = glm::vec3(0.99f, 0.60f, 0.59f);
+        diffuse = glm::mix(danger_color, normal_color, color_factor);
+
         // fragment requirements
         set_uniform(wall_program, viewposC, camera_pos);
         set_uniform(wall_program, shininessC, wall_shininess);
@@ -468,22 +518,24 @@ int main(int argc, char *argv[]) {
 
         set_uniform(ghost_program, projectionC, projection);
         set_uniform(ghost_program, viewC, view);
-
-        struct {
-            bool operator()(const Ghost *a, const Ghost *b) const {
-                glm::vec3 a_diff, b_diff;
-                a_diff = player->get_pos() - a->get_pos();
-                b_diff = player->get_pos() - b->get_pos();
-                float a_dist2, b_dist2;
-                a_dist2 = a_diff.x * a_diff.x + a_diff.y * a_diff.y + a_diff.z * a_diff.z;
-                b_dist2 = b_diff.x * b_diff.x + b_diff.y * b_diff.y + b_diff.z * b_diff.z;
-                return a_dist2 < b_dist2;
-            }
-        } ghost_compare;
-        std::partial_sort(ghosts.begin(), ghosts.begin() + ghosts.size() / 5, ghosts.end(), ghost_compare);
         for (int i = ghosts.size()/5; i >= 0; i--) {
             glm::mat4 ghost_model = ghosts[i]->get_model(camera_pos);
             ghosts[i]->apply_movement(current_frame, timed);
+            
+            // Check if ghost is within 10.0 units of player
+            glm::vec3 ghost_pos = ghosts[i]->get_pos();
+            glm::vec3 player_pos = player->get_pos();
+            float distance = glm::length(ghost_pos - player_pos);
+            if (distance <= 10.0f) {
+                player->reset_position(start_position, start_yaw);
+            }
+            
+            // Check if ghost is within 30.0 units of start_position
+            float start_distance = glm::length(ghost_pos - start_position);
+            if (start_distance <= 30.0f) {
+                ghosts[i]->reverse_direction_from_position(start_position);
+            }
+            
             set_uniform(ghost_program, modelC, ghost_model);
             glBindVertexArray(ghostVAO);
             glDrawArrays(GL_TRIANGLES, 0, (3 + 3 + 2) * 6);

ghostland.json

@@ -0,0 +1,3 @@
+{
+    "camera_speed": 30.0
+}

glad/glad.h

@@ -1,6 +1,6 @@
 /*
 
-    OpenGL loader generated by glad 0.1.36 on Sat Oct  7 18:46:55 2023.
+    OpenGL loader generated by glad 0.1.36 on Sun Apr  7 15:29:39 2024.
 
     Language/Generator: C/C++
     Specification: gl

maze.txt

@@ -1,4 +1,4 @@
-845.0 2.5 -5.0 -128.0
+845.0 2.5 -5.0 0.0
 6498
 -0.5 0.0 0.5 0.0 0.0 1.0
 959.5 0.0 0.5 0.0 0.0 1.0

player.cpp

@@ -250,6 +250,12 @@ void Player::apply_movement(float timed) {
 
 }
 
+void Player::reset_position(glm::vec3 startpos, float startyaw) {
+    position = startpos;
+    yaw = startyaw;
+    velocity = glm::vec3(0.0f, 0.0f, 0.0f);
+}
+
 glm::vec3 Player::get_normal_from_index(int ix) {
     return glm::vec3(
         wall_vertices[ix * 6 * 6 + 3],

player.h

@@ -40,6 +40,7 @@ class Player {
         void scroll_callback(GLFWwindow* window, double xoffset, double yoffset);
         bool is_in_air();
         void apply_movement(float timed);
+        void reset_position(glm::vec3 startpos, float startyaw);
 
         bool operator()(const Ghost &a, const Ghost &b) const;