Add project files

.gitignore

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+# Build artifacts
+a.out
+*.o
+build/

build.sh

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+cc main.c -lraylib -lGL -lm -lpthread -ldl -lrt -lX11

main.c

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+#include "raylib.h"
+#include "rcamera.h"
+#include "raymath.h"
+#include <stdbool.h>
+
+//----------------------------------------------------------------------------------
+// Defines and Macros
+//----------------------------------------------------------------------------------
+// Movement constants
+#define GRAVITY         32.0f
+#define MAX_SPEED       20.0f
+#define CROUCH_SPEED     5.0f
+#define JUMP_FORCE      12.0f
+#define MAX_ACCEL      150.0f
+
+// Grounded drag
+#define FRICTION         0.86f
+
+// Increasing air drag, increases strafing speed
+#define AIR_DRAG         0.98f
+
+// Responsiveness for turning movement direction to looked direction
+#define CONTROL         15.0f
+#define CROUCH_HEIGHT    0.0f
+#define STAND_HEIGHT     2.0f
+#define BOTTOM_HEIGHT    0.5f
+
+// Additional definitions
+#define NORMALIZE_INPUT  0
+#define ARRLEN(a) (sizeof(a) / sizeof((a)[0]))
+
+enum game_state {
+    STATE_MENU,    // 0 by default
+    STATE_GAME,    // 1
+};
+
+//----------------------------------------------------------------------------------
+//Defining program structure
+//----------------------------------------------------------------------------------
+
+typedef struct
+{
+    Camera camera;   // <- now part of the game state
+    Model  model;    // you can keep model & its position here too
+    Vector3 position; 
+    Vector3 velocity;
+    Vector3 dir;
+    Vector2 sensitivity;
+    Vector2 lookRotation;
+    Vector2 lean;
+    float   headTimer;
+    float   walkLerp;
+    float   headLerp;
+    bool isGrounded;
+    int cameraMode;
+} Player;
+
+typedef struct 
+{
+    int index;
+    enum game_state state;
+    int shouldExit;
+    Player player;
+} Master;
+
+//------------------------------------------------------------------------------------
+// Function Initation
+//------------------------------------------------------------------------------------
+void Simple_Center_Box(double percent_verticle_gap, double percent_horizontal_gap, int screenWidth, int screenHeight, Color color);
+void Thick_Center_Box(double percent_verticle_gap, double percent_horizontal_gap, float line_width, int screenWidth, int screenHeight, Color color);
+void Simple_Menu(const char *array[], int count, int index, int x1, int y1, int total_width, int total_height, int line_thickess, int font_size, Color color, Color alt_color);
+void UpdateBody(Master* g, float rot, char side, char forward, bool jumpPressed, bool crouchHold);
+static void UpdateCameraAngle(Master* g);
+static void DrawLevel(Model mdlTile);
+static void CenterMouseAndFlush(void);
+
+//------------------------------------------------------------------------------------
+// Program main entry point
+//------------------------------------------------------------------------------------
+int main(void)
+{
+    // Initialization
+    //--------------------------------------------------------------------------------------
+    //Define window size, create window, establish fps target, fullscreen.
+    const int screenWidth = 1440*2;
+    const int screenHeight = 960*2;
+    
+    InitWindow(screenWidth, screenHeight, "raylib");
+    SetTargetFPS(60);               // Set our game to run at 60 frames-per-second
+    ToggleFullscreen();
+    CenterMouseAndFlush();
+    DisableCursor();                    // Limit cursor to relative movement inside the window
+
+    //Define menu characteristics
+    const char *menu[] = {"Game", "Option 2", "Exit"};
+    int index_length = ARRLEN(menu);
+
+    //General game state initiation
+    Master g = (Master){0};
+    g.index = 0;
+    g.state = STATE_MENU;
+    g.shouldExit = 0;
+
+    //Define
+    g.player.sensitivity = (Vector2){ 0.001f, 0.001f };
+    g.player.lookRotation = (Vector2){ 0 };
+    g.player.headTimer = 0.0f;
+    g.player.walkLerp = 0.0f;
+    g.player.headLerp = STAND_HEIGHT;
+    g.player.lean = (Vector2){ 0 };
+
+    //Define the player camera
+    g.player.camera = (Camera){0};
+    g.player.camera.position = (Vector3){
+        g.player.position.x,
+        g.player.position.y + (BOTTOM_HEIGHT + g.player.headLerp),
+        g.player.position.z,
+    };
+
+    //g.player.camera.target = (Vector3){ 0.0f, 0.0f, 1.0f };   // Camera target
+    g.player.camera.up = (Vector3){ 0.0f, 1.0f, 0.0f };       // Up vector
+    g.player.camera.fovy = 60.0f;
+    g.player.camera.projection = CAMERA_PERSPECTIVE;
+    g.player.cameraMode = CAMERA_FIRST_PERSON;
+
+    UpdateCameraAngle(&g);
+
+    // Load GLTF model (no animations)
+    //Model model = LoadModel("bad_sphere.glb");
+    //Vector3 position = { 0.0f, 0.0f, 0.0f };
+
+    // Load a 2D image as texture for the billboard
+    //Billboards always point toward the active camera.
+    Texture2D sign = LoadTexture("diard-charles.jpg");
+    GenTextureMipmaps(&sign);
+    SetTextureFilter(sign, TEXTURE_FILTER_BILINEAR); // optional but looks nicer
+    Vector3 bbPos = (Vector3){ 1.0f, 2.5f, 1.0f };  // where in 3D world to place it
+    float   bbSize = 5.0f;                          // billboard height in world units
+
+    // Load a 2D image as texture for the billboard
+    //Billboards always point toward the active camera.
+    Texture2D tree = LoadTexture("tree.png");
+    GenTextureMipmaps(&tree);
+    SetTextureFilter(tree, TEXTURE_FILTER_BILINEAR); // optional but looks nicer
+    Vector3 treepos = (Vector3){ 0.0f, 7.0f, 0.0f };  // where in 3D world to place it
+    float   treeSize = 15.0f;                          // billboard height in world units
+
+    // --- Grass tile setup ---
+    Texture2D texGrass = LoadTexture("grass_textures/Grass_01.png");   // adjust path
+    GenTextureMipmaps(&texGrass);
+    SetTextureFilter(texGrass, TEXTURE_FILTER_TRILINEAR);    // nicer at angles
+    SetTextureWrap(texGrass, TEXTURE_WRAP_REPEAT);
+
+    // A 3D plane (centered at origin) of size tileSize x tileSize
+    const float tileSize = 5.0f;  // match your DrawLevel tileSize
+    Mesh meshTile = GenMeshPlane(tileSize, tileSize, 1, 1);
+    Model mdlTile = LoadModelFromMesh(meshTile);
+    mdlTile.materials[0].maps[MATERIAL_MAP_ALBEDO].texture = texGrass;
+
+    //--------------------------------------------------------------------------------------
+
+    // Main game loop
+    //--------------------------------------------------------------------------------------
+    while (!g.shouldExit && !WindowShouldClose())    // Detect window close button or ESC key
+    {
+        // Update
+        //----------------------------------------------------------------------------------
+        switch (g.state) 
+        {
+            case STATE_MENU:
+            {
+                if (IsKeyPressed(KEY_UP) && g.index > 0) 
+                {
+                    g.index -= 1;
+                    break;
+                };
+
+                if (IsKeyPressed(KEY_DOWN) && g.index < index_length - 1) 
+                {
+                    g.index += 1;
+                    break;
+                };
+                
+                if (IsKeyPressed(KEY_ENTER))
+                {
+                    switch (g.index) 
+                    {
+                        case 0:
+                        {
+                            g.state = 1;
+                            CenterMouseAndFlush();
+                            break;
+                        }
+
+                        case 1:
+                        {
+                            break;
+                        }
+
+                        case 2:
+                        {
+                            g.shouldExit = 1;
+                            break;
+                        }
+                     }
+                };
+                break;
+            };
+            case STATE_GAME:
+            {
+                Vector2 mouseDelta = GetMouseDelta();
+                g.player.lookRotation.x -= mouseDelta.x*g.player.sensitivity.x;
+                g.player.lookRotation.y += mouseDelta.y*g.player.sensitivity.y;
+
+                char sideway = (IsKeyDown(KEY_D) - IsKeyDown(KEY_A));
+                char forward = (IsKeyDown(KEY_W) - IsKeyDown(KEY_S));
+                bool crouching = IsKeyDown(KEY_LEFT_CONTROL);
+                UpdateBody(&g, g.player.lookRotation.x, sideway, forward, IsKeyDown(KEY_SPACE), crouching);
+
+                float delta = GetFrameTime();
+                g.player.headLerp = Lerp(g.player.headLerp, (crouching ? CROUCH_HEIGHT : STAND_HEIGHT), 20.0f*delta);
+                g.player.camera.position = (Vector3){
+                    g.player.position.x,
+                    g.player.position.y + (BOTTOM_HEIGHT + g.player.headLerp),
+                    g.player.position.z,
+                };
+
+                if (g.player.isGrounded && ((forward != 0) || (sideway != 0)))
+                {
+                    g.player.headTimer += delta*3.0f;
+                    g.player.walkLerp = Lerp(g.player.walkLerp, 1.0f, 10.0f*delta);
+                    g.player.camera.fovy = Lerp(g.player.camera.fovy, 55.0f, 5.0f*delta);
+                }
+                else
+                {
+                    g.player.walkLerp = Lerp(g.player.walkLerp, 0.0f, 10.0f*delta);
+                    g.player.camera.fovy = Lerp(g.player.camera.fovy, 60.0f, 5.0f*delta);
+                }
+
+                g.player.lean.x = Lerp(g.player.lean.x, sideway*0.02f, 10.0f*delta);
+                g.player.lean.y = Lerp(g.player.lean.y, forward*0.015f, 10.0f*delta);
+
+                UpdateCameraAngle(&g);
+
+
+
+
+
+                int bbdifx = g.player.position.x - bbPos.x;
+                int bbdifz = g.player.position.z - bbPos.z;
+                
+                bbPos.x += 0.01 * bbdifx;
+                bbPos.z += 0.01 * bbdifz;
+
+                treepos = (Vector3){ 0.0f, 7.0f, 0.0f };
+
+                break;
+            };
+        }
+        //----------------------------------------------------------------------------------
+
+        // Draw
+        //----------------------------------------------------------------------------------
+        BeginDrawing();
+            switch (g.state) 
+            {
+                case STATE_MENU:
+                {
+                    ClearBackground(BLACK);                        
+
+                    Simple_Menu(menu, ARRLEN(menu), g.index, screenWidth * 0.15, screenHeight * 0.15, 500, screenHeight * 0.7, 10, 50, GREEN, LIGHTGRAY);
+
+                    Thick_Center_Box(0.1, 0.1, 10, screenWidth, screenHeight, GREEN);
+                    break;
+                }
+                case STATE_GAME:
+                {
+                    ClearBackground(BLACK);
+
+                    BeginMode3D(g.player.camera);
+                        DrawLevel(mdlTile);
+                        DrawBillboard(g.player.camera, sign, bbPos, bbSize, WHITE);
+
+                        DrawBillboard(g.player.camera, tree, treepos, treeSize, WHITE);
+
+                        treepos.x += 3*5;
+                        treepos.z += 3*5;
+                        DrawBillboard(g.player.camera, tree, treepos, treeSize, WHITE);
+
+                        treepos.x += 5*5;
+                        treepos.z += -2*5;
+                        DrawBillboard(g.player.camera, tree, treepos, treeSize, WHITE);
+
+                        treepos.x += -4*5;
+                        treepos.z += 3*5;
+                        DrawBillboard(g.player.camera, tree, treepos, treeSize, WHITE);
+
+                        treepos.x += 9*5;
+                        treepos.z += 10*5;
+                        DrawBillboard(g.player.camera, tree, treepos, treeSize, WHITE);
+
+                    EndMode3D();
+
+                    // Draw info box
+                    DrawRectangle(5, 5, 330, 75, Fade(SKYBLUE, 0.5f));
+                    DrawRectangleLines(5, 5, 330, 75, BLUE);
+
+                    DrawText("Camera controls:", 15, 15, 10, BLACK);
+                    DrawText("- Move keys: W, A, S, D, Space, Left-Ctrl", 15, 30, 10, BLACK);
+                    DrawText("- Look around: arrow keys or mouse", 15, 45, 10, BLACK);
+                    DrawText(TextFormat("- Velocity Len: (%06.3f)", Vector2Length((Vector2){ g.player.velocity.x, g.player.velocity.z })), 15, 60, 10, BLACK);
+
+                    break;
+                }
+            }
+        EndDrawing();
+        //----------------------------------------------------------------------------------
+    };
+    //--------------------------------------------------------------------------------------
+
+    // De-Initialization
+    //--------------------------------------------------------------------------------------
+    // Detach the texture from the model so UnloadModel won't try to free it.
+    mdlTile.materials[0].maps[MATERIAL_MAP_ALBEDO].texture = (Texture2D){0};
+
+    // Now free resources you loaded:
+    UnloadModel(mdlTile);      // frees the model and its mesh/VBOs
+    UnloadTexture(texGrass);   // frees the grass texture you loaded
+    UnloadTexture(sign);       // frees billboard texture
+    UnloadTexture(tree);       // frees tree texture
+    
+    CloseWindow();        // Close window and OpenGL context
+    //--------------------------------------------------------------------------------------
+    return 0;
+};
+
+//------------------------------------------------------------------------------------
+// Function Definitions
+//------------------------------------------------------------------------------------
+//Function creates a simple box outline centered in the screen with a symetric ofset from the screen borders.
+void Simple_Center_Box(double percent_verticle_gap, double percent_horizontal_gap, int screenWidth, int screenHeight, Color color)
+{
+    int x1 = percent_horizontal_gap * screenWidth;
+    int y1 = percent_verticle_gap * screenHeight;
+
+    int w = screenWidth * (1 - (2 * percent_horizontal_gap));
+    int h = screenHeight * (1 - (2 * percent_verticle_gap));
+    
+    DrawRectangleLines(x1, y1, w, h, color);
+}
+
+//Function creates a thick walled box outline centered in the screen with a symetric ofset from the screen borders.
+void Thick_Center_Box(double percent_verticle_gap, double percent_horizontal_gap, float line_width, int screenWidth, int screenHeight, Color color)
+{
+    int x1 = percent_horizontal_gap * screenWidth;
+    int y1 = percent_verticle_gap * screenHeight;
+
+    int w = screenWidth * (1 - (2 * percent_horizontal_gap));
+    int h = screenHeight * (1 - (2 * percent_verticle_gap));
+
+    struct Rectangle rec = {x1,y1,w,h};
+    
+    DrawRectangleLinesEx(rec, line_width, color);
+}
+
+//Make a simple menu with selection features
+void Simple_Menu(const char *array[], int count, int index, int x1, int y1, int total_width, int total_height, int line_thickess, int font_size, Color color, Color alt_color)
+{
+    float height = 0.8f * total_height;
+    int space = 0.2 * total_height / (count - 1);
+
+    struct Rectangle rec = {x1,y1,total_width,(float)height/count};
+
+    for (int i = 0; i < count; ++i) 
+    {
+        int text_width = MeasureText(array[i], font_size);
+
+        if(i == index)
+        {
+            DrawRectangleLinesEx(rec, line_thickess, alt_color);
+            DrawText(array[i], rec.x + (((total_width - 2.0 * line_thickess) - text_width)/2), rec.y + (height/count/2) - font_size/2.0f, font_size, alt_color);
+        }
+        else 
+        {
+            DrawRectangleLinesEx(rec, line_thickess, color);
+            DrawText(array[i], rec.x + (((total_width - 2.0 * line_thickess) - text_width)/2), rec.y + (height/count/2) - font_size/2.0f, font_size, color);
+        }
+
+        rec.y = rec.y + (float)height/count + space;
+    }
+}
+
+void UpdateBody(Master* g, float rot, char side, char forward, bool jumpPressed, bool crouchHold)
+{
+    Vector2 input = (Vector2){ (float)side, (float)-forward };
+
+#if defined(NORMALIZE_INPUT)
+    // Slow down diagonal movement
+    if ((side != 0) && (forward != 0)) input = Vector2Normalize(input);
+#endif
+
+    float delta = GetFrameTime();
+
+    if (!g->player.isGrounded) g->player.velocity.y -= GRAVITY*delta;
+
+    if (g->player.isGrounded && jumpPressed)
+    {
+        g->player.velocity.y = JUMP_FORCE;
+        g->player.isGrounded = false;
+
+        // Sound can be played at this moment
+        //SetSoundPitch(fxJump, 1.0f + (GetRandomValue(-100, 100)*0.001));
+        //PlaySound(fxJump);
+    }
+
+    Vector3 front = (Vector3){ sin(rot), 0.f, cos(rot) };
+    Vector3 right = (Vector3){ cos(-rot), 0.f, sin(-rot) };
+
+    Vector3 desiredDir = (Vector3){ input.x*right.x + input.y*front.x, 0.0f, input.x*right.z + input.y*front.z, };
+    g->player.dir = Vector3Lerp(g->player.dir, desiredDir, CONTROL*delta);
+
+    float decel = (g->player.isGrounded ? FRICTION : AIR_DRAG);
+    Vector3 hvel = (Vector3){ g->player.velocity.x*decel, 0.0f, g->player.velocity.z*decel };
+
+    float hvelLength = Vector3Length(hvel); // Magnitude
+    if (hvelLength < (MAX_SPEED*0.01f)) hvel = (Vector3){ 0 };
+
+    // This is what creates strafing
+    float speed = Vector3DotProduct(hvel, g->player.dir);
+
+    // Whenever the amount of acceleration to add is clamped by the maximum acceleration constant,
+    // a Player can make the speed faster by bringing the direction closer to horizontal velocity angle
+    // More info here: https://youtu.be/v3zT3Z5apaM?t=165
+    float maxSpeed = (crouchHold? CROUCH_SPEED : MAX_SPEED);
+    float accel = Clamp(maxSpeed - speed, 0.f, MAX_ACCEL*delta);
+    hvel.x += g->player.dir.x*accel;
+    hvel.z += g->player.dir.z*accel;
+
+    g->player.velocity.x = hvel.x;
+    g->player.velocity.z = hvel.z;
+
+    g->player.position.x += g->player.velocity.x*delta;
+    g->player.position.y += g->player.velocity.y*delta;
+    g->player.position.z += g->player.velocity.z*delta;
+
+    // Fancy collision system against the floor
+    if (g->player.position.y <= 0.0f)
+    {
+        g->player.position.y = 0.0f;
+        g->player.velocity.y = 0.0f;
+        g->player.isGrounded = true; // Enable jumping
+    }
+}
+
+// Update camera
+static void UpdateCameraAngle(Master* g)
+{
+    const Vector3 up = (Vector3){ 0.0f, 1.0f, 0.0f };
+    const Vector3 targetOffset = (Vector3){ 0.0f, 0.0f, -1.0f };
+
+    // Left and right
+    Vector3 yaw = Vector3RotateByAxisAngle(targetOffset, up, g->player.lookRotation.x);
+
+    // Clamp view up
+    float maxAngleUp = Vector3Angle(up, yaw);
+    maxAngleUp -= 0.001f; // Avoid numerical errors
+    if ( -(g->player.lookRotation.y) > maxAngleUp) { g->player.lookRotation.y = -maxAngleUp; }
+
+    // Clamp view down
+    float maxAngleDown = Vector3Angle(Vector3Negate(up), yaw);
+    maxAngleDown *= -1.0f; // Downwards angle is negative
+    maxAngleDown += 0.001f; // Avoid numerical errors
+    if ( -(g->player.lookRotation.y) < maxAngleDown) { g->player.lookRotation.y = -maxAngleDown; }
+
+    // Up and down
+    Vector3 right = Vector3Normalize(Vector3CrossProduct(yaw, up));
+
+    // Rotate view vector around right axis
+    float pitchAngle = -g->player.lookRotation.y - 
+    g->player.lean.y;
+    pitchAngle = Clamp(pitchAngle, -PI / 2 + 0.0001f, PI / 2 - 0.0001f); // Clamp angle so it doesn't go past straight up or straight down
+    Vector3 pitch = Vector3RotateByAxisAngle(yaw, right, pitchAngle);
+
+    // Head animation
+    // Rotate up direction around forward axis
+    float headSin = sin(g->player.headTimer*PI);
+    float headCos = cos(g->player.headTimer*PI);
+    const float stepRotation = 0.005f;
+    g->player.camera.up = Vector3RotateByAxisAngle(up, pitch, headSin*stepRotation + g->player.lean.x);
+
+    // Camera BOB
+    const float bobSide = 0.01f;
+    const float bobUp = 0.01f;
+    Vector3 bobbing = Vector3Scale(right, headSin*bobSide);
+    bobbing.y = fabsf(headCos*bobUp);
+
+    g->player.camera.position = Vector3Add(g->player.camera.position, Vector3Scale(bobbing, g->player.walkLerp));
+    g->player.camera.target = Vector3Add(g->player.camera.position, pitch);
+}
+
+// Draw game level
+static void DrawLevel(Model mdlTile)
+{
+    const int floorExtent = 25;
+    const float tileSize = 5.0f;
+    const Color tileColor1 = (Color){ 150, 200, 200, 255 };
+
+    // Floor tiles
+    for (int y = -floorExtent; y < floorExtent; y++)
+    {
+        for (int x = -floorExtent; x < floorExtent; x++)
+        {
+            /*
+            if ((y & 1) && (x & 1))
+            {
+                DrawPlane((Vector3){ x*tileSize, 0.0f, y*tileSize}, (Vector2){ tileSize, tileSize }, tileColor1);
+            }
+            else if (!(y & 1) && !(x & 1))
+            {
+                DrawPlane((Vector3){ x*tileSize, 0.0f, y*tileSize}, (Vector2){ tileSize, tileSize }, LIGHTGRAY);
+            }
+            */
+            Vector3 pos = (Vector3){ x*tileSize, 0.0f, y*tileSize };
+            // mdlTile must be accessible here: make it global/static or pass it in
+            DrawModel(mdlTile, pos, 1.0f, WHITE);
+
+        }
+    }
+
+    /*
+    const Vector3 towerSize = (Vector3){ 16.0f, 32.0f, 16.0f };
+    const Color towerColor = (Color){ 150, 200, 200, 255 };
+
+    Vector3 towerPos = (Vector3){ 16.0f, 16.0f, 16.0f };
+    DrawCubeV(towerPos, towerSize, towerColor);
+    DrawCubeWiresV(towerPos, towerSize, DARKBLUE);
+
+    towerPos.x *= -1;
+    DrawCubeV(towerPos, towerSize, towerColor);
+    DrawCubeWiresV(towerPos, towerSize, DARKBLUE);
+
+    towerPos.z *= -1;
+    DrawCubeV(towerPos, towerSize, towerColor);
+    DrawCubeWiresV(towerPos, towerSize, DARKBLUE);
+
+    towerPos.x *= -1;
+    DrawCubeV(towerPos, towerSize, towerColor);
+    DrawCubeWiresV(towerPos, towerSize, DARKBLUE);
+
+    // Red sun
+    DrawSphere((Vector3){ 300.0f, 300.0f, 0.0f }, 100.0f, (Color){ 255, 0, 0, 255 });
+    */
+}
+
+//fix mouse
+static void CenterMouseAndFlush() {
+    SetMousePosition(GetRenderWidth()/2, GetRenderHeight()/2);
+    (void)GetMouseDelta();
+}