Cuber/main.cpp

#include <raylib.h>
#include <raymath.h>
#include <rlgl.h>
#include "rlImGui.h"
#include "imgui.h"

enum CubeFace {
    FRONT = 0,
    RIGHT,
    BACK,
    LEFT,
    BOTTOM,
    TOP
};

struct VecTriangle {
    Vector3 pointOne;
    Vector3 pointTwo;
    Vector3 pointThree;
};

struct Plane3D {
    VecTriangle one;
    VecTriangle two;
    Color color;
};

struct RubixCube {
    Plane3D faces[6][9];
    Vector3 pos;
};

void DrawRubixCube(RubixCube* cube);
void DrawPlane3D(Plane3D* plane);
Plane3D CreatePlane3D(float width, float height, Vector3 position, Color color, Vector3 normal);
RubixCube CreateRubixCube(Vector3 position, float size);

int main() {
    SetConfigFlags(FLAG_VSYNC_HINT);
    InitWindow(1920, 1080, "Rubix Cube");

    DisableCursor();

    Camera3D cam = { 0 };
    cam.position = { 10.0f, 10.0f, 10.0f };
    cam.target = { 0.0f, 0.0f, 0.0f };
    cam.up = { 0.0f, 1.0f, 0.0f };
    cam.fovy = 45.0f;
    cam.projection = CAMERA_PERSPECTIVE;

    float cubeSize = 3.0f;
    float previousCubeSize = cubeSize;
    RubixCube cube = CreateRubixCube({0.0f, 0.0f, 0.0f}, cubeSize);

    // Disable backface culling
    rlDisableBackfaceCulling();

    // Setup ImGui
    rlImGuiSetup(true);

    bool isControllingCamera = true;

    while (!WindowShouldClose()) {
        if (IsKeyPressed(KEY_SPACE)) isControllingCamera = !isControllingCamera;
        if (isControllingCamera) UpdateCamera(&cam, CAMERA_FREE);
        if (!isControllingCamera) DrawText("Camera paused", 10, 10, 32, BLACK);

        BeginDrawing();
        ClearBackground(GRAY);

        rlImGuiBegin();
        ImGui::Begin("Controls");
        ImGui::SliderFloat("Cube Size", &cubeSize, 1.0f, 10.0f); 
        ImGui::End();
        rlImGuiEnd();

        if (cubeSize != previousCubeSize) {
            cube = CreateRubixCube({0.0f, 0.0f, 0.0f}, cubeSize);
            previousCubeSize = cubeSize;
        }


        BeginMode3D(cam);

        DrawRubixCube(&cube);

        DrawGrid(10, 1.0f);

        EndMode3D();
        EndDrawing();
    }
    

    return 0;
}

void DrawRubixCube(RubixCube* cube) {
    for (int face = 0; face < 6; face++) {
        for (int i = 0; i < 9; i++) {
            DrawPlane3D(&cube->faces[face][i]);
        }
    }
}

RubixCube CreateRubixCube(Vector3 position, float size) {
    RubixCube cube;
    cube.pos = position;

    float planeSize = size / 3.0f;
    int faceIndex;

    for (int face = 0; face < 6; face++) {
        faceIndex = 0;
        for (int x = -1; x <= 1; x++) {
            for (int y = -1; y <= 1; y++) {
                Vector3 planePos = { position.x + x * planeSize, position.y + y * planeSize, position.z };

                switch (face) {
                    case FRONT:
                        planePos = { position.x + x * planeSize, position.y + y * planeSize, position.z + size / 2 };
                        cube.faces[face][faceIndex++] = CreatePlane3D(planeSize, planeSize, planePos, RED, {0, 0, 1});
                        break;
                    case BACK:
                        planePos = { position.x + x * planeSize, position.y + y * planeSize, position.z - size / 2 };
                        cube.faces[face][faceIndex++] = CreatePlane3D(planeSize, planeSize, planePos, ORANGE, {0, 0, -1});
                        break;
                    case LEFT:
                        planePos = { position.x - size / 2, position.y + y * planeSize, position.z + x * planeSize };
                        cube.faces[face][faceIndex++] = CreatePlane3D(planeSize, planeSize, planePos, BLUE, {-1, 0, 0});
                        break;
                    case RIGHT:
                        planePos = { position.x + size / 2, position.y + y * planeSize, position.z + x * planeSize };
                        cube.faces[face][faceIndex++] = CreatePlane3D(planeSize, planeSize, planePos, GREEN, {1, 0, 0});
                        break;
                    case TOP:
                        planePos = { position.x + x * planeSize, position.y + size / 2, position.z + y * planeSize };
                        cube.faces[face][faceIndex++] = CreatePlane3D(planeSize, planeSize, planePos, YELLOW, {0, 1, 0});
                        break;
                    case BOTTOM:
                        planePos = { position.x + x * planeSize, position.y - size / 2, position.z + y * planeSize };
                        cube.faces[face][faceIndex++] = CreatePlane3D(planeSize, planeSize, planePos, WHITE, {0, -1, 0});
                        break;
                }
            }
        }
    }

    return cube;
}

void DrawPlane3D(Plane3D* plane) {
    DrawTriangle3D(plane->one.pointOne, plane->one.pointTwo, plane->one.pointThree, plane->color);
    DrawTriangle3D(plane->two.pointOne, plane->two.pointTwo, plane->two.pointThree, plane->color);
}

Plane3D CreatePlane3D(float width, float height) {    
    Plane3D plane3D;
    plane3D.color = BLUE;

    plane3D.one.pointOne = { -width / 2.0f, -height / 2.0f, 0.0f };
    plane3D.one.pointTwo = {  width / 2.0f, -height / 2.0f, 0.0f };
    plane3D.one.pointThree = { -width / 2.0f,  height / 2.0f, 0.0f };

    plane3D.two.pointOne = {  width / 2.0f, -height / 2.0f, 0.0f };
    plane3D.two.pointTwo = {  width / 2.0f,  height / 2.0f, 0.0f };
    plane3D.two.pointThree = { -width / 2.0f,  height / 2.0f, 0.0f };

    return plane3D;
}

Plane3D CreatePlane3D(float width, float height, Vector3 position, Color color) {
    Plane3D plane3D;
    plane3D.color = color;

    plane3D.one.pointOne = { position.x - width / 2.0f, position.y - height / 2.0f, position.z };
    plane3D.one.pointTwo = { position.x + width / 2.0f, position.y - height / 2.0f, position.z };
    plane3D.one.pointThree = { position.x - width / 2.0f, position.y + height / 2.0f, position.z };

    plane3D.two.pointOne = { position.x + width / 2.0f, position.y - height / 2.0f, position.z };
    plane3D.two.pointTwo = { position.x + width / 2.0f, position.y + height / 2.0f, position.z };
    plane3D.two.pointThree = { position.x - width / 2.0f, position.y + height / 2.0f, position.z };

    return plane3D;
}

Plane3D CreatePlane3D(float width, float height, Vector3 position, Color color, Vector3 normal) {
    Plane3D plane3D;
    plane3D.color = color;

    Vector3 right, up;

    if (Vector3Equals(normal, {0, 1, 0}) || Vector3Equals(normal, {0, -1, 0})) {
        right = {1, 0, 0};
        up = {0, 0, (normal.y > 0) ? -1 : 1};
    } else {
        right = {normal.z, 0, -normal.x};
        up = {0, 1, 0};
    }

    plane3D.one.pointOne = Vector3Add(Vector3Add(position, Vector3Scale(right, -width / 2)), Vector3Scale(up, -height / 2));
    plane3D.one.pointTwo = Vector3Add(Vector3Add(position, Vector3Scale(right, width / 2)), Vector3Scale(up, -height / 2));
    plane3D.one.pointThree = Vector3Add(Vector3Add(position, Vector3Scale(right, -width / 2)), Vector3Scale(up, height / 2));

    plane3D.two.pointOne = Vector3Add(Vector3Add(position, Vector3Scale(right, width / 2)), Vector3Scale(up, -height / 2));
    plane3D.two.pointTwo = Vector3Add(Vector3Add(position, Vector3Scale(right, width / 2)), Vector3Scale(up, height / 2));
    plane3D.two.pointThree = Vector3Add(Vector3Add(position, Vector3Scale(right, -width / 2)), Vector3Scale(up, height / 2));

    return plane3D;
}