Yam/main.cpp at master · DevItBetter/Yam · GitHub

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#include <algorithm>
#include <iostream>

#include "SDL3/SDL.h"

#include "SDL3/SDL_main.h"
int main(int argc, char *argv[])
{
    SDL_Window *window = nullptr;
    SDL_Renderer *renderer = nullptr;
    SDL_Surface *imageSurface = nullptr;
    SDL_Texture *texture = nullptr;
    SDL_Event event;

    std::cout << "Launching..." << std::endl;

    if (SDL_InitSubSystem(SDL_INIT_VIDEO) < 0){
        std::cout << "Couldn't initialize SDL: " << SDL_GetError() << std::endl;
        return -1;
    }

    if (SDL_CreateWindowAndRenderer("It's Slime Time", 640, 480, SDL_WINDOW_OPENGL|SDL_WINDOW_RESIZABLE|SDL_WINDOW_INPUT_FOCUS, &window, &renderer) != 0) {
        std::cout << "Couldn't create window and renderer: " << SDL_GetError() << std::endl;
        return -2;
    }

    imageSurface = SDL_LoadBMP("C:\\Users\\Jeff\\dev\\assets\\slime.bmp");
    if (imageSurface == NULL) {
        std::cout << "Couldn't create surface from image: " << SDL_GetError() << std::endl;
        return -3;
    }
    texture = SDL_CreateTextureFromSurface(renderer, imageSurface);
    if (texture == NULL) {
        std::cout << "Couldn't create texture from surface: " << SDL_GetError() << std::endl;
        return -4;
    }

    int textureWidth,textureHeight;
    SDL_FRect textureRect;

    SDL_QueryTexture(texture, NULL, NULL, &textureWidth, &textureHeight);
    textureRect.x=0;
    textureRect.y=0;
    textureRect.w=textureWidth;
    textureRect.h=textureHeight;

    SDL_DestroySurface(imageSurface);

    SDL_Surface *windowSurface = SDL_GetWindowSurface(window);

    bool running {true};
    const auto StepSize {10};

    bool up, down, left, right;
    up = down = left = right = false;

    while (running)
    {
        if(SDL_PollEvent(&event)==SDL_TRUE)
        {
            switch(event.type)
            {
                case SDL_EVENT_QUIT:
                    running = false;
                    break;

                case SDL_EVENT_KEY_DOWN:
                    switch(event.key.keysym.sym)
                    {
                        case SDLK_UP: //fall-through
                        case SDLK_w:
                            up = true;
                            break;
                        case SDLK_DOWN: //fall-through
                        case SDLK_s:
                            down = true;
                            break;
                        case SDLK_LEFT: //fall-through
                        case SDLK_a:
                            left = true;
                            break;
                        case SDLK_RIGHT: //fall-through
                        case SDLK_d:
                            right = true;
                            break;
                    }
                    break;
                case SDL_EVENT_KEY_UP:
                    switch(event.key.keysym.sym)
                    {
                        case SDLK_UP: //fall-through
                        case SDLK_w:
                            up = false;
                            break;
                        case SDLK_DOWN: //fall-through
                        case SDLK_s:
                            down = false;
                            break;
                        case SDLK_LEFT: //fall-through
                        case SDLK_a:
                            left = false;
                            break;
                        case SDLK_RIGHT: //fall-through
                        case SDLK_d:
                            right = false;
                            break;
                    }
                    break;
            }
        }

        if(up)
        {
            textureRect.y -= StepSize;
        }
        if(down)
        {
            textureRect.y += StepSize;
        }
        if(left)
        {
            textureRect.x -= StepSize;
        }
        if(right)
        {
            textureRect.x += StepSize;
        }

        // keep texture within window
        textureRect.y = std::clamp(static_cast<int>(textureRect.y),0,static_cast<int>(windowSurface->h - textureRect.h));
        textureRect.x = std::clamp(static_cast<int>(textureRect.x),0,static_cast<int>(windowSurface->w - textureRect.w));

        SDL_SetRenderDrawColor(renderer, 0x00, 0x00, 0x00, 0x00);
        SDL_RenderClear(renderer);
        SDL_RenderTexture(renderer, texture, NULL, &textureRect);
        SDL_RenderPresent(renderer);
    }

    std::cout << "Exiting..." << std::endl;
    SDL_DestroySurface(windowSurface);
    SDL_DestroyTexture(texture);
    SDL_DestroyRenderer(renderer);
    SDL_DestroyWindow(window);
    SDL_Quit();

    return 0;
}