SpriteComponent.h

#pragma once
 
#include "../../../Components.h"
#include <SDL2/SDL.h>
#include "GL/glew.h"
#include "../../../Animators/Animation.h"
 
#include "../../../Animators/FlashAnimation.h"
#include <map>
#include <cstddef>
 
 
// TODO: (extra): can add states for different states (0 for full solid tile or 1 for no solid
class SpriteComponent : public Component //sprite -> transform
{
private:
    const GLTexture* gl_texture = nullptr;
 
public:
    std::string texture_name = "";
    TazColor default_color = { 255, 255, 255, 255 };
    TazColor color = { 255, 255, 255, 255 };
 
    TransformComponent* transform = nullptr;
    SDL_FRect srcRect = { 0,0,0,0 };
 
    Animation animation;
    FlashAnimation flash_animation;
 
    SDL_RendererFlip spriteFlip = SDL_FLIP_NONE;
 
 
    int currentItem = 0;
 
    SpriteComponent() = default;
    SpriteComponent(std::string id)
    {
        setTex(id);
    }
    SpriteComponent(TazColor clr)
    {
        default_color = clr;
        color = clr;
    }
 
    ~SpriteComponent()
    {
    }
 
    void setTex(std::string id) //this function is used to change texture of a sprite
    {
        texture_name = id;
        gl_texture = TextureManager::getInstance().Get_GLTexture(id);
        srcRect.w = (float)gl_texture->width;
        srcRect.h = (float)gl_texture->height;
    }
 
    void init() override
    {
        if (!entity->hasComponent<TransformComponent>())
        {
            entity->addComponent<TransformComponent>();
        }
        transform = &entity->GetComponent<TransformComponent>();
 
        srcRect.x = srcRect.y = 0;
        srcRect.w = transform->size.x;
        srcRect.h = transform->size.y;
 
    }
 
    void update(float deltaTime) override
    {
    }
 
    void draw(size_t v_index, PlaneModelRenderer& batch, TazGraphEngine::Window& window)
    {
        if (gl_texture == NULL)
        {
            return;
        }
 
        float screenScale = window.getScale();
 
        glm::vec3 pos(
            transform->getPosition().x * screenScale,
            transform->getPosition().y * screenScale,
            transform->getPosition().z);
 
        glm::vec2 size(
            transform->size.x * transform->scale * screenScale,
            transform->size.y * transform->scale * screenScale);
 
        float srcUVposX = spriteFlip == SDL_FLIP_HORIZONTAL ?
            (srcRect.x + srcRect.w) / gl_texture->width :
            srcRect.x / gl_texture->width;
        float srcUVposY = (srcRect.y) / gl_texture->height;
 
        float srcUVw = spriteFlip == SDL_FLIP_HORIZONTAL ?
            -srcRect.w / gl_texture->width :
            srcRect.w / gl_texture->width;
        float srcUVh = srcRect.h / gl_texture->height;
 
        glm::vec4 uv(srcUVposX, srcUVposY, srcUVw, srcUVh);
 
        batch.draw(v_index, size, transform->getPosition(), transform->rotation, uv, gl_texture->id);
 
        glDisableVertexAttribArray(0);
        glDisableVertexAttribArray(1);
        glDisableVertexAttribArray(2);
 
        glBindBuffer(GL_ARRAY_BUFFER, 0);
 
        /*glBindTexture(GL_TEXTURE_2D, 0);*/
    }
 
    void SetAnimation(int idX, int idY, size_t fr, float sp, const Animation::animType type, int reps = 0)
    {
        animation = Animation(idX, idY, fr, sp, type, reps);
    }
 
    void SetFlashAnimation(size_t fr, float sp, const Animation::animType type, const std::vector<float>& flashTimes, TazColor flashC, int reps = 0)
    {
        flash_animation = FlashAnimation(fr, sp, type, flashTimes, flashC, reps);
    }
 
    void setCurrFrame() {
        this->srcRect.x = (this->animation.indexX * this->transform->size.x) /* init */ + (this->srcRect.w * animation.cur_frame_index/* curframe from total frams */);
        this->srcRect.y = this->animation.indexY * this->transform->size.y;
    }
 
    void setFlashFrame() {
        this->color = this->flash_animation.flashColor * this->flash_animation.interpolation_a
            + default_color * (1 - this->flash_animation.interpolation_a);
    }
 
    void DestroyTex()
    {
        //TextureManager::DestroyTexture(texture);
        gl_texture = nullptr;
    }
    void DestroyGlTex()
    {
        gl_texture = NULL;
    }
 
    std::string GetComponentName() override {
        return "SpriteComponent";
    }
 
    void showGUI(std::vector<BaseComponent*> otherComponents = {}) override {
        showGUI(otherComponents, { entity });
    };
 
    void showGUI(std::vector<BaseComponent*> otherComponents, std::vector<Entity*> otherEntities) override {
        ImGui::Separator();
 
        // Get the list of texture names
        std::vector<std::string> textureNames = TextureManager::getInstance().Get_GLTextureNames();
 
        if (!textureNames.empty()) {
            std::vector<const char*> items;
            for (const std::string& name : textureNames)
                items.push_back(name.c_str());
 
            if (ImGui::Combo("Textures", &currentItem, items.data(), (int)items.size())) {
                if (!textureNames[currentItem].empty()) {
                    setTex(textureNames[currentItem]);
                }
            }
        }
    }
};