cannot load multiple textures in SDL 2.0

Question

I am trying to load multiple texture images in my SDL app but I cannot load or render the second image on the screen. All I see is my grass.bmp being displayed. Cannot load the Bob.bmp. I have no idea where the error could be as I have implemented everything properly

My header file

#include <SDL.h>
#include <SDL_image.h>

#ifndef GAMEWINDOW_H
#define GAMEWINDOW_H

class GameWindow{
private:
    bool _running;
    SDL_Window* _screen;
    SDL_Renderer* _renderer;
    SDL_Texture* _grassTexture;
    SDL_Texture* _bobTexture;
    SDL_Rect _grassRect;
    SDL_Rect _bobRect;
......

my .cpp file

void GameWindow::LoadSprites(){
    _grassTexture = IMG_LoadTexture(_renderer,"grass.bmp");
    _grassRect.x = 0;
    _grassRect.y = 0;
    _grassRect.w = 600;
    _grassRect.h = 500;

    _bobTexture = IMG_LoadTexture(_renderer,"bob.bmp");
    _bobRect.x = 150;
    _bobRect.y = 150;
    _bobRect.w = 80;
    _bobRect.y = 50;
}
void GameWindow::Initialize(){
    if(SDL_Init(SDL_INIT_EVERYTHING) == -1)
        _running = false;
}
void GameWindow::SetupScreen(){
    _screen = SDL_CreateWindow("My Game Window",
                          100,
                          100,
                          640, 480,
                          SDL_WINDOW_SHOWN | SDL_WINDOW_RESIZABLE);

    if(_screen == NULL){
       _running = false;
    }
    _renderer = SDL_CreateRenderer(_screen,-1,SDL_RENDERER_ACCELERATED);
    GameWindow::LoadSprites();
}
void GameWindow::Update(){

}
void GameWindow::Render(){
    SDL_RenderClear(_renderer);
    SDL_RenderCopy(_renderer,_bobTexture,NULL,&(_bobRect));
    SDL_RenderCopy(_renderer,_grassTexture,NULL,&(_grassRect));

    SDL_RenderPresent(_renderer);
}

All i see is the grass.bmp. I cannot render the second image. The image is fine. I tried debugging with the same grass.bmp in place of bob.bmp but it still does not show. Only the first image gets rendered and the second does not!! Hope someone could spot the error. I had no problems in SDL 1.2 but after switching to 2.0 its creating a whole lot of errors and confusion!!

Answer 1

Ok, you've got two issues.

First. Look really hard at the last line of the _bobRect initialization. Guess what value the _bobRect.h parameter will have? (hint, it's 0 :)

_bobRect.x = 150;
_bobRect.y = 150;
_bobRect.w = 80;
_bobRect.y = 50;

Second, since you copy _grassTexture on top of _bobTexture and it's larger it will hide _bobTexture unless it's transparent. So change the order so the background gets copied first like this

SDL_RenderCopy(_renderer,_grassTexture,NULL,&(_grassRect));
SDL_RenderCopy(_renderer,_bobTexture,NULL,&(_bobRect));

Then you should be fine.