Tesseract-Engine/src/Windows/RenderWindow.cpp

// RenderWindow.cpp

#include "RenderWindow.h"
#include <vector> // Added as per your inclusion
#include <GL/glew.h> // Ensure GLEW is initialized before using OpenGL functions
#include <glm/gtc/matrix_transform.hpp>
#include <glm/gtc/type_ptr.hpp>
#include "imgui.h"
#include "gcml.h"
#include "Componenets/GameObject.h" // Corrected typo: "Componenets" -> "Components"
#include "Componenets/Mesh.h"       // Corrected typo: "mesh.h" -> "Mesh.h"
#include "Componenets/Transform.h"  // Corrected typo: "transform.h" -> "Transform.h"
#include "Engine/AssetManager.h"
#include "Icons.h"

// External References
extern std::vector<std::shared_ptr<GameObject>> g_GameObjects;
extern AssetManager g_AssetManager;
extern std::shared_ptr<CameraComponent> g_RuntimeCameraObject;
extern int g_GPU_Triangles_drawn_to_screen;


// Example cube data (position + UVs)
static float g_CubeVertices[] =
{
    // Positions        // UVs
    // Front Face
    -1.f, -1.f,  1.f, 0.f, 0.f,
    -1.f,  1.f,  1.f, 0.f, 1.f,
     1.f,  1.f,  1.f, 1.f, 1.f,
     1.f, -1.f,  1.f, 1.f, 0.f,
    // Back Face
    -1.f, -1.f, -1.f, 1.f, 0.f,
    -1.f,  1.f, -1.f, 1.f, 1.f,
     1.f,  1.f, -1.f, 0.f, 1.f,
     1.f, -1.f, -1.f, 0.f, 0.f,
    // Left Face
    -1.f, -1.f, -1.f, 0.f, 0.f,
    -1.f,  1.f, -1.f, 0.f, 1.f,
    -1.f,  1.f,  1.f, 1.f, 1.f,
    -1.f, -1.f,  1.f, 1.f, 0.f,
    // Right Face
     1.f, -1.f, -1.f, 1.f, 0.f,
     1.f,  1.f, -1.f, 1.f, 1.f,
     1.f,  1.f,  1.f, 0.f, 1.f,
     1.f, -1.f,  1.f, 0.f, 0.f,
    // Top Face
    -1.f,  1.f, -1.f, 0.f, 1.f,
    -1.f,  1.f,  1.f, 0.f, 0.f,
     1.f,  1.f,  1.f, 1.f, 0.f,
     1.f,  1.f, -1.f, 1.f, 1.f,
    // Bottom Face
    -1.f, -1.f, -1.f, 1.f, 1.f,
    -1.f, -1.f,  1.f, 1.f, 0.f,
     1.f, -1.f,  1.f, 0.f, 0.f,
     1.f, -1.f, -1.f, 0.f, 1.f,
};

static unsigned int g_CubeIndices[] =
{
    // Front
    0, 1, 2,  2, 3, 0,
    // Back
    4, 5, 6,  6, 7, 4,
    // Left
    8, 9,10, 10,11, 8,
    // Right
   12,13,14, 14,15,12,
    // Top
   16,17,18, 18,19,16,
    // Bottom
   20,21,22, 22,23,20
};

// Play/Pause Button Implementation
bool PlayPauseButton(const char* label, bool* isPlaying, ImVec2 Size)
{
    // Begin the button
    if (ImGui::Button(label, Size))
    {
        // Toggle the state
        *isPlaying = !(*isPlaying);
        return true; // Indicate that the state was toggled
    }

    // Add tooltip
    if (ImGui::IsItemHovered())
    {
        ImGui::SetTooltip(*isPlaying ? "Pause (Space)" : "Play (Space)");
    }

    // Get the current window's draw list
    ImDrawList* draw_list = ImGui::GetWindowDrawList();

    // Get the position of the button
    ImVec2 button_pos = ImGui::GetItemRectMin();
    ImVec2 button_size = ImGui::GetItemRectSize();
    ImVec2 center = ImVec2(button_pos.x + button_size.x * 0.5f, button_pos.y + button_size.y * 0.5f);

    // Define icon size
    float icon_size = 0.4f * Size.x;
    float half_icon_size = icon_size / 2.0f;

    // Define colors
    ImU32 icon_color = ImGui::GetColorU32(ImGuiCol_Text);

    if (*isPlaying)
    {
        // Draw Pause Icon (two vertical bars)
        float bar_width = 4.0f;
        float spacing = 0.1f * Size.x;

        // Left bar
        ImVec2 left_bar_p1 = ImVec2(center.x - spacing - bar_width, center.y - half_icon_size);
        ImVec2 left_bar_p2 = ImVec2(center.x - spacing, center.y + half_icon_size);
        draw_list->AddRectFilled(left_bar_p1, left_bar_p2, icon_color, 2.0f);

        // Right bar
        ImVec2 right_bar_p1 = ImVec2(center.x + spacing, center.y - half_icon_size);
        ImVec2 right_bar_p2 = ImVec2(center.x + spacing + bar_width, center.y + half_icon_size);
        draw_list->AddRectFilled(right_bar_p1, right_bar_p2, icon_color, 2.0f);
    }
    else
    {
        // Draw Play Icon (triangle)
        ImVec2 p1 = ImVec2(center.x - half_icon_size, center.y - half_icon_size);
        ImVec2 p2 = ImVec2(center.x - half_icon_size, center.y + half_icon_size);
        ImVec2 p3 = ImVec2(center.x + half_icon_size, center.y);
        draw_list->AddTriangleFilled(p1, p2, p3, icon_color);
    }

    return false; // No toggle occurred
}

// Constructor
RenderWindow::RenderWindow()
{
}

// Destructor
RenderWindow::~RenderWindow()
{
    // Delete main FBO
    if (m_FBO != 0)
    {
        glDeleteFramebuffers(1, &m_FBO);
    }

    // Delete shadow FBO and shadow map
    if (m_ShadowFBO != 0)
    {
        glDeleteFramebuffers(1, &m_ShadowFBO);
    }
    if (m_ShadowMap)
    {
        glDeleteTextures(1, &m_ShadowMap);
    }

    // Delete VAO, VBO, EBO
    if (m_VAO != 0)
        glDeleteVertexArrays(1, &m_VAO);
    if (m_VBO != 0)
        glDeleteBuffers(1, &m_VBO);
    if (m_EBO != 0)
        glDeleteBuffers(1, &m_EBO);

    // Delete quad VAO and VBO
    if (m_QuadVAO != 0)
        glDeleteVertexArrays(1, &m_QuadVAO);
    if (m_QuadVBO != 0)
        glDeleteBuffers(1, &m_QuadVBO);

    // Delete textures
    if (m_TextureIDLoaded != 0)
        glDeleteTextures(1, &m_TextureIDLoaded);
    if (m_TextureID != 0)
        glDeleteTextures(1, &m_TextureID);

    // Delete shaders
    if (m_ShaderPtr)
    {
        delete m_ShaderPtr;
        m_ShaderPtr = nullptr;
    }
    if (m_ShadowShaderPtr)
    {
        delete m_ShadowShaderPtr;
        m_ShadowShaderPtr = nullptr;
    }
    if (m_VisualizeShaderPtr)
    {
        delete m_VisualizeShaderPtr;
        m_VisualizeShaderPtr = nullptr;
    }
}




// Example implementation of RenderShadowMapPreview
void RenderWindow::RenderShadowMapPreview()
{
    // Begin ImGui window
    ImGui::Begin("Shadow Map Preview");

    // Light Camera Controls
    ImGui::Text("Light Camera Controls");
    ImGui::Separator();

    // Position Controls
    ImGui::DragFloat3("Position", glm::value_ptr(m_LightPosition), 0.1f, -20.0f, 20.0f);
    
    // Rotation Controls (Euler angles in degrees)
    ImGui::DragFloat3("Rotation", glm::value_ptr(m_LightRotation), 1.0f, -180.0f, 180.0f);

    // Update Light View Matrix based on Position and Rotation
    // Convert Euler angles to radians
    glm::vec3 rotationRad = glm::radians(m_LightRotation);
    
    // Create rotation matrices
    glm::mat4 rotX = glm::rotate(glm::mat4(1.0f), rotationRad.x, glm::vec3(1.0f, 0.0f, 0.0f));
    glm::mat4 rotY = glm::rotate(glm::mat4(1.0f), rotationRad.y, glm::vec3(0.0f, 1.0f, 0.0f));
    glm::mat4 rotZ = glm::rotate(glm::mat4(1.0f), rotationRad.z, glm::vec3(0.0f, 0.0f, 1.0f));
    
    // Combined rotation
    glm::mat4 rotation = rotZ * rotY * rotX;
    
    // Update Light View Matrix
    m_LightViewMatrix = glm::lookAt(m_LightPosition, glm::vec3(0.0f), glm::vec3(0.0f, 1.0f, 0.0f)) * rotation;

    // Shadow Map Rendering
    if (1)
    {
        // Define the size of the preview image
        ImVec2 imageSize = ImVec2(256, 256); // Adjust as needed

        // Configure OpenGL state for rendering the quad
        glDisable(GL_DEPTH_TEST); // Disable depth test so quad renders over everything
        m_VisualizeShaderPtr->Use();
        m_VisualizeShaderPtr->SetInt("depthMap", 0); // Texture unit 0

        // Bind the depth map texture
        glActiveTexture(GL_TEXTURE0);
        glBindTexture(GL_TEXTURE_2D, m_ShadowMap);

        // Render the quad
        glBindVertexArray(m_QuadVAO);
        glDrawArrays(GL_TRIANGLES, 0, 6);
        glBindVertexArray(0);

        // Re-enable depth testing
        glEnable(GL_DEPTH_TEST);

        // Display the shadow map texture in ImGui
        ImGui::Image((intptr_t)m_ShadowMap, imageSize, ImVec2(0, 1), ImVec2(1, 0));
    }
    else
    {
        ImGui::Text("Shadow map not available.");
    }

    ImGui::End();
}





void RenderWindow::Show(bool* GameRunning)
{

    


    ImGui::Begin(ICON_FA_GAMEPAD " Editor##EditorWindow");

    if (!m_Initialized)
    {
        InitGLResources();
        m_LightProjMatrix = glm::ortho(-10.0f, 10.0f, -10.0f, 10.0f, 1.0f, 20.0f);
        m_LightViewMatrix = glm::mat4(1.0f); // Will be updated based on position and rotation

        m_Initialized = true;
    }

    ImVec2 size = ImGui::GetContentRegionAvail();
    int w = static_cast<int>(size.x);
    int h = static_cast<int>(size.y);

    // If there's space, render to the FBO, then show it as an ImGui image
    if (w > 0 && h > 0)
    {
        if (w != m_LastWidth || h != m_LastHeight)
        {
            // Since m_FBO is a GLuint, you cannot call Create() on it directly.
            // Instead, you need to delete the existing FBO and recreate it with the new size.

            // Delete existing FBO and its attachments
            if (m_FBO != 0)
            {
                glDeleteFramebuffers(1, &m_FBO);
                glDeleteTextures(1, &m_TextureID);
            }

            // Recreate the main FBO with the new size
            glGenFramebuffers(1, &m_FBO);
            glBindFramebuffer(GL_FRAMEBUFFER, m_FBO);

            // Create a new color attachment texture
            glGenTextures(1, &m_TextureID);
            glBindTexture(GL_TEXTURE_2D, m_TextureID);
            glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, w, h, 0, GL_RGB, GL_UNSIGNED_BYTE, nullptr);
            glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
            glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
            glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, m_TextureID, 0);

            // Create a renderbuffer object for depth and stencil attachment
            GLuint rbo;
            glGenRenderbuffers(1, &rbo);
            glBindRenderbuffer(GL_RENDERBUFFER, rbo);
            glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH24_STENCIL8, w, h);
            glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT, GL_RENDERBUFFER, rbo);

            // Check if framebuffer is complete
            if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE)
                std::cerr << "[RenderWindow] Main FBO is not complete after resizing." << std::endl;

            glBindFramebuffer(GL_FRAMEBUFFER, 0);

            m_LastWidth = w;
            m_LastHeight = h;
        }

        // Render the scene to the FBO with shadow mapping
        RenderSceneToFBO(GameRunning);

        // Display the main FBO's color texture in ImGui
        ImGui::Image((intptr_t)m_TextureID, size, ImVec2(0, 0), ImVec2(1, 1));

        // Calculate button position to place it slightly right and down from the top-left of the image
        ImVec2 imagePos = ImGui::GetItemRectMin();

        // Add an offset to position the button
        ImVec2 buttonOffset(10.0f, 10.0f); // Adjust these values as needed for the desired offset
        ImVec2 buttonPos = ImVec2(imagePos.x + buttonOffset.x, imagePos.y + buttonOffset.y);

        // Set cursor position for the button
        ImGui::SetCursorScreenPos(buttonPos);

        // Dynamically calculate button size based on window size
        float buttonWidth = size.x * 0.03f; // 3% of the window width
        ImVec2 buttonSize = ImVec2(buttonWidth, buttonWidth);

        // Render the Play/Pause button with the calculated size
        PlayPauseButton("##PlayPauseButton", GameRunning, buttonSize);
    }

    ImGui::End();
    RenderShadowMapPreview();


}

void RenderWindow::InitGLResources()
{
    // ----------------------------------------------------
    // 1) Load SHADER from the asset manager
    // ----------------------------------------------------

    {
        std::shared_ptr<Shader> shaderAsset = g_AssetManager.loadAsset<Shader>(AssetType::SHADER, "assets/shaders/UnlitMaterial");
        if (!shaderAsset)
        {
            fprintf(stderr, "[RenderWindow] Failed to load shader via AssetManager.\n");
            return;
        }
        // Cast back to your Shader class
        m_ShaderPtr = shaderAsset.get();
    }

    {
        std::shared_ptr<Shader> shaderAsset = g_AssetManager.loadAsset<Shader>(AssetType::SHADER, "assets/shaders/Depth");
        if (!shaderAsset)
        {
            fprintf(stderr, "[RenderWindow] Failed to load shadow shader via AssetManager.\n");
            return;
        }
        // Cast back to your Shader class
        m_ShadowShaderPtr = shaderAsset.get();
    }

    {
        std::shared_ptr<Shader> shaderAsset = g_AssetManager.loadAsset<Shader>(AssetType::SHADER, "assets/shaders/DepthVisualize");
        if (!shaderAsset)
        {
            fprintf(stderr, "[RenderWindow] Failed to load visualization shader via AssetManager.\n");
            return;
        }
        // Cast back to your Shader class
        m_VisualizeShaderPtr = shaderAsset.get();
    }

    // ----------------------------------------------------
    // 2) Create VAO/VBO/EBO for the cube
    // ----------------------------------------------------
    glGenVertexArrays(1, &m_VAO);
    glBindVertexArray(m_VAO);

    glGenBuffers(1, &m_VBO);
    glBindBuffer(GL_ARRAY_BUFFER, m_VBO);
    glBufferData(GL_ARRAY_BUFFER, sizeof(g_CubeVertices), g_CubeVertices, GL_STATIC_DRAW);

    glGenBuffers(1, &m_EBO);
    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, m_EBO);
    glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(g_CubeIndices), g_CubeIndices, GL_STATIC_DRAW);

    // Position = location 0, UV = location 1
    glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE,
                          5 * sizeof(float), (void*)0);
    glEnableVertexAttribArray(0);

    glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE,
                          5 * sizeof(float), (void*)(3 * sizeof(float)));
    glEnableVertexAttribArray(1);

    glBindVertexArray(0);

    // ----------------------------------------------------
    // 3) Load TEXTURE from the asset manager
    // ----------------------------------------------------
    {
        std::shared_ptr<GLuint> texAsset = g_AssetManager.loadAsset<GLuint>(AssetType::TEXTURE, "assets/textures/wood.png");
        if (!texAsset)
        {
            fprintf(stderr, "[RenderWindow] Failed to load texture.\n");
        }
        else
        {
            // Cast from shared_ptr<GLuint> to GLuint
            m_TextureIDLoaded = *texAsset; // Assign the GLuint value
        }
    }

    // ----------------------------------------------------
    // 4) Setup Visualization Quad
    // ----------------------------------------------------
    {
        float quadVertices[] = {
            // positions   // texCoords
            -1.0f,  1.0f,  0.0f, 1.0f,
            -1.0f, -1.0f,  0.0f, 0.0f,
             1.0f, -1.0f,  1.0f, 0.0f,

            -1.0f,  1.0f,  0.0f, 1.0f,
             1.0f, -1.0f,  1.0f, 0.0f,
             1.0f,  1.0f,  1.0f, 1.0f
        };

        glGenVertexArrays(1, &m_QuadVAO);
        glGenBuffers(1, &m_QuadVBO);
        glBindVertexArray(m_QuadVAO);
        glBindBuffer(GL_ARRAY_BUFFER, m_QuadVBO);
        glBufferData(GL_ARRAY_BUFFER, sizeof(quadVertices), &quadVertices, GL_STATIC_DRAW);
        glEnableVertexAttribArray(0);
        glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 4 * sizeof(float), (void*)0);
        glEnableVertexAttribArray(1);
        glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 4 * sizeof(float), (void*)(2 * sizeof(float)));
        glBindVertexArray(0);
    }

    m_Initialized = true;
}

void CheckOpenGLError(const std::string& location)
{
    GLenum err;
    bool hasError = false;
    while ((err = glGetError()) != GL_NO_ERROR)
    {
        std::cerr << "[OpenGL Error] (" << err << ") at " << location << std::endl;
        hasError = true;
    }
    if (hasError)
    {
        // Optionally, handle the error (e.g., throw an exception, assert, etc.)
    }
}

// RenderWindow.cpp

void RenderWindow::RenderSceneToFBO(bool* GameRunning)
{
    if (!m_Initialized) {
        
        std::cerr << "[RenderWindow] OpenGL resources not initialized." << std::endl;
        return;
    }

    m_RotationAngle += 0.001f; // Spin per frame

    // 1. Shadow Pass: Render the scene from the light's perspective to create the shadow map
    glViewport(0, 0, 1024, 1024); // Shadow map resolution
    glBindFramebuffer(GL_FRAMEBUFFER, m_ShadowFBO);
    glClear(GL_DEPTH_BUFFER_BIT);

    m_ShadowShaderPtr->Use();
    m_ShadowShaderPtr->SetMat4("uLightView", m_LightViewMatrix);
    m_ShadowShaderPtr->SetMat4("uLightProj", m_LightProjMatrix);

    // Render all objects to the shadow map
    for (auto& obj : g_GameObjects)
    {
        std::shared_ptr<TransformComponent> transform = obj->GetComponent<TransformComponent>();
        std::shared_ptr<MeshComponent> mesh = obj->GetComponent<MeshComponent>();

        if (transform && mesh)
        {
            glm::mat4 model = glm::mat4(1.0f);
            model = glm::translate(model, transform->position);
            model = glm::rotate(model, glm::radians(transform->rotation.x), glm::vec3(1.0f, 0.0f, 0.0f));
            model = glm::rotate(model, glm::radians(transform->rotation.y), glm::vec3(0.0f, 1.0f, 0.0f));
            model = glm::rotate(model, glm::radians(transform->rotation.z), glm::vec3(0.0f, 0.0f, 1.0f));
            model = glm::scale(model, transform->scale);

            m_ShadowShaderPtr->SetMat4("uModel", model);

            for (const auto& submesh : mesh->submeshes)
            {
                if (submesh.vao == 0)
                {
                    std::cerr << "[RenderWindow] Warning: Submesh VAO is not initialized." << std::endl;
                    continue;
                }

                glBindVertexArray(submesh.vao);
                glDrawElements(GL_TRIANGLES, static_cast<GLsizei>(submesh.indices.size()), GL_UNSIGNED_INT, nullptr);
                glBindVertexArray(0);
            }
        }
    }

    glBindFramebuffer(GL_FRAMEBUFFER, 0); // Unbind shadow FBO

    // 2. Render Pass: Render the scene from the camera's perspective using the shadow map
    glBindFramebuffer(GL_FRAMEBUFFER, m_FBO);
    glViewport(0, 0, m_LastWidth, m_LastHeight);
    glEnable(GL_DEPTH_TEST);
    glClearColor(0.f, 0.f, 0.f, 1.f);
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    m_ShaderPtr->Use();

    // Define view and projection matrices
    std::shared_ptr<CameraComponent> activeCamera = nullptr;
    glm::mat4 view;
    glm::mat4 proj;

    if (*GameRunning && g_RuntimeCameraObject)
    {
        activeCamera = g_RuntimeCameraObject;
    }

    if (activeCamera)
    {
        view = activeCamera->GetViewMatrix();
        proj = activeCamera->GetProjectionMatrix();
    }
    else
    {
        view = glm::translate(glm::mat4(1.f), glm::vec3(0.f, 0.f, -5.f));
        float aspect = (m_LastHeight != 0) ? static_cast<float>(m_LastWidth) / static_cast<float>(m_LastHeight) : 1.0f;
        proj = glm::perspective(glm::radians(45.0f), aspect, 0.1f, 100.0f); // Replace with your CAM_FOV, CAM_NEAR_PLAIN, CAM_FAR_PLAIN
    }

    // Set uniforms for the main shader
    glm::mat4 lightSpaceMatrix = m_LightProjMatrix * m_LightViewMatrix;
    m_ShaderPtr->SetMat4("uLightSpaceMatrix", lightSpaceMatrix);

    // Bind shadow map texture to texture unit 1
    glActiveTexture(GL_TEXTURE1);
    glBindTexture(GL_TEXTURE_2D, m_ShadowMap);
    m_ShaderPtr->SetInt("uShadowMap", 1);

    // Set light parameters
    glm::vec3 lightDir = glm::normalize(glm::vec3(-2.0f, -4.0f, -1.0f));
    m_ShaderPtr->SetVec3("light.direction", lightDir);
    m_ShaderPtr->SetVec3("light.position", -lightDir * 10.0f); // Same as lightPos in shadow pass

    // Set camera/view position
    if (activeCamera && activeCamera->GetOwner())
    {
        auto transformComp = activeCamera->GetOwner()->GetComponent<TransformComponent>();
        if (transformComp)
            m_ShaderPtr->SetVec3("viewPos", transformComp->position);
        else
            m_ShaderPtr->SetVec3("viewPos", glm::vec3(0.f, 0.f, 0.f));
    }
    else
    {
        m_ShaderPtr->SetVec3("viewPos", glm::vec3(0.f, 0.f, 0.f));
    }

    // Render all objects
    for (auto& obj : g_GameObjects)
    {
        std::shared_ptr<TransformComponent> transform = obj->GetComponent<TransformComponent>();
        std::shared_ptr<MeshComponent> mesh = obj->GetComponent<MeshComponent>();

        if (transform && mesh)
        {
            glm::mat4 model = glm::mat4(1.f);
            model = glm::translate(model, transform->position);
            model = glm::rotate(model, glm::radians(transform->rotation.x), glm::vec3(1.f, 0.f, 0.f));
            model = glm::rotate(model, glm::radians(transform->rotation.y), glm::vec3(0.f, 1.f, 0.f));
            model = glm::rotate(model, glm::radians(transform->rotation.z), glm::vec3(0.f, 0.f, 1.f));
            model = glm::scale(model, transform->scale);

            glm::mat4 mvp = proj * view * model;
            m_ShaderPtr->SetMat4("uMVP", mvp);
            m_ShaderPtr->SetMat4("uModel", model);

            for (const auto& submesh : mesh->submeshes)
            {
                if (submesh.vao == 0)
                {
                    std::cerr << "[RenderWindow] Warning: Submesh VAO is not initialized." << std::endl;
                    continue;
                }

                // Update triangle count
                g_GPU_Triangles_drawn_to_screen += static_cast<int>(submesh.indices.size() / 3);

                // Bind diffuse textures
                const int MAX_DIFFUSE = 32;
                int textureUnit = 0;

                for (const auto& texture : submesh.textures)
                {
                    if (texture.type == "texture_diffuse")
                    {
                        if (textureUnit >= MAX_DIFFUSE)
                        {
                            std::cerr << "[RenderWindow] Warning: Exceeded maximum number of diffuse textures (" << MAX_DIFFUSE << ") for shader." << std::endl;
                            break;
                        }

                        glActiveTexture(GL_TEXTURE0 + textureUnit);
                        glBindTexture(GL_TEXTURE_2D, texture.id); // Assuming texture.id is GLuint

                        std::string uniformName = "uTextures.texture_diffuse[" + std::to_string(textureUnit) + "]";
                        m_ShaderPtr->SetInt(uniformName, textureUnit);

                        textureUnit++;
                    }
                }

                // Assign default texture to unused slots
                for (int i = textureUnit; i < MAX_DIFFUSE; ++i)
                {
                    std::string uniformName = "uTextures.texture_diffuse[" + std::to_string(i) + "]";
                    m_ShaderPtr->SetInt(uniformName, 0); // Texture unit 0 should have a default texture bound
                }

                // Set number of active diffuse textures
                m_ShaderPtr->SetInt("uNumDiffuseTextures", textureUnit);

                // Draw the submesh
                glBindVertexArray(submesh.vao);
                glDrawElements(GL_TRIANGLES, static_cast<GLsizei>(submesh.indices.size()), GL_UNSIGNED_INT, nullptr);
                glBindVertexArray(0);

                // Reset active texture
                glActiveTexture(GL_TEXTURE0);
            }
        }
    }

    // Unbind shader and framebuffer
    glUseProgram(0);
    glBindFramebuffer(GL_FRAMEBUFFER, 0);

    // 3. Render Shadow Map Preview (if not already rendered in Show)
    // If you have integrated RenderShadowMapPreview into Show, you might not need to call it here
    // Otherwise, uncomment the following line:
    // RenderShadowMapPreview();
}