Hello I have bought the book SDL game development from amazon to learn SDL2 game programming on Ubuntu.
I have my first game engine up and running but when I add code to draw a BMP in the top left of the screen I just get a black screen when I run it.
Can anybody help me solve this I would really appreciate it.
Also I am not sure if I have the texture creation code on lines 8-15 in the right place, I tried moving it around but it didn't make a difference.
main.cpp
<code>
#include <SDL2/SDL.h>
#include "Game.h"
#include "Game.cpp"
int main(int argc, char * args[])
{
Game * g_game = new Game;
g_game->init("Chapter 1", 100,100,640,480,false);
while(g_game->running())
{
g_game->handleEvents();
g_game->update();
g_game->renderer();
}
g_game->clean();
return 0;
}
<code/>
Game.cpp
<code>
#include "Game.h"
#include <iostream>
bool Game::init(const char* title, int xpos, int ypos, int width,
int height, bool fullscreen)
{
SDL_Surface * pTempSurface = SDL_LoadBMP("assets/rider.bmp");
m_pTexture = SDL_CreateTextureFromSurface(m_pRenderer,pTempSurface);
SDL_FreeSurface(pTempSurface);
SDL_QueryTexture(m_pTexture, NULL,NULL,&m_sourceRectangle.w,&m_sourceRectangle.h);
m_destinationRectangle.x = m_sourceRectangle.x =0;
m_destinationRectangle.y = m_sourceRectangle.y =0;
m_destinationRectangle.w = m_sourceRectangle.w;
m_destinationRectangle.h = m_sourceRectangle.h;
int flags = 0;
if (fullscreen)
{
flags = SDL_WINDOW_FULLSCREEN;
}
// attempt to initialize SDL
if(SDL_Init(SDL_INIT_EVERYTHING) == 0)
{
std::cout<<"SDL Init Success\n";
// init the window
m_pWindow = SDL_CreateWindow(title, xpos, ypos, width, height, flags);
if(m_pWindow != 0) //window init success
{
std::cout<<"Window Creation Success\n";
m_pRenderer = SDL_CreateRenderer(m_pWindow, -1, 0);
if(m_pRenderer !=0) // render init success
{
std::cout<<"Renderer Creation Success\n";
SDL_SetRenderDrawColor(m_pRenderer, 0,0,0,0);
}
else
{
std::cout<<"Renderer Init Fail\n";
return false; // renderer init fail
}
}
else
{
std::cout<<"Window Init Fail\n";
return false; //window init fail
}
}
else
{
std::cout<<"SDL Init Fail\n";
return false; // SDL init fail
}
std::cout<<"Init success\n";
m_bRunning = true; // everything inited successfully
// start the main loop
return true;
}
void Game::renderer()
{
SDL_RenderClear(m_pRenderer); // clears the renderer
// to the draw colour
SDL_RenderCopy(m_pRenderer, m_pTexture, &m_sourceRectangle,&m_destinationRectangle);
SDL_RenderPresent(m_pRenderer); // draw to the screen
}
void Game::update()
{
}
void Game::clean()
{
std::cout<<"Cleaning game\n";
SDL_DestroyWindow(m_pWindow);
SDL_DestroyRenderer(m_pRenderer);
SDL_Quit();
}
void Game::handleEvents()
{
SDL_Event event;
if(SDL_PollEvent(&event))
{
switch (event.type)
{
case SDL_QUIT:
m_bRunning = false;
break;
}
}
}
<code/>
game.h
<code>
#ifndef __Game__
#define __Game__
class Game
{
public:
Game() {}
~Game() {}
bool init(const char* title, int xpos, int ypos, int width,
int height, bool fullscreen);
void renderer();
void update();
void handleEvents();
void clean();
// a function to access the private running variable
bool running() {return m_bRunning;}
private:
SDL_Window * m_pWindow;
SDL_Renderer * m_pRenderer;
SDL_Texture * m_pTexture; //the new SDL Texture variable
SDL_Rect m_sourceRectangle; // the first rectangle
SDL_Rect m_destinationRectangle;// another rectangle
bool m_bRunning;
};
#endif /* defined(__Game_h__) */
<code/>
