Can somebody show me how to load a bit map
#SDL question
patent pumice
dusky palmBOT
gleaming mountain
@patent pumice
https://wiki.libsdl.org/SDL_LoadBMP
patent pumice
@gleaming mountain It didn't work
gleaming mountain
<@683365524540751886> It didn't work
what do you mean
gleaming mountain
want to see or no
on failure NULL is returned, did you check for that?
patent pumice
Nope i didn't get the failure
but surfaceblit returned -1
which is bad and im puzzled as to why
#undef main
#include <iostream>
#define SCREEN_WIDTH 1000
#define SCREEN_HEIGHT 1000
static bool success = false;
class WND
{
public:
SDL_Window* window = NULL;
SDL_Surface* wndsurface = NULL;
SDL_Surface* imgsurface = NULL;
void close()
{
//Deallocate surface
SDL_FreeSurface(imgsurface);
imgsurface = NULL;
SDL_FreeSurface(wndsurface);
//Destroy window
SDL_DestroyWindow(window);
window = NULL;
//Quit SDL subsystems
SDL_Quit();
}
bool init()
{
if (SDL_Init(SDL_INIT_VIDEO) < 0)
{
std::cout << "Couldn't initialize exiting" << '\n';
success = false;
}
window = SDL_CreateWindow("Window created", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, SCREEN_WIDTH, SCREEN_HEIGHT, SDL_WINDOW_SHOWN);
SDL_Delay(2000);
success = true;
return success;
}
bool loadMedia()
{
bool success = true;
//Load splash image
imgsurface = SDL_LoadBMP("Bitmap.bmp");
if (imgsurface == NULL)
{
printf("Unable to load image %s! SDL Error: %s\n", "Bitmap.bmp", SDL_GetError());
success = false;
}
return success;
}
};
int main()
{
WND wc;
SDL_Event e;
bool quit = false;
if (!wc.init())
{
std::cout << "Couldn't intialize" << '\n';
}
if (!wc.loadMedia())
{
std::cout << "Media failed" << '\n';
}
SDL_BlitSurface(wc.imgsurface, NULL, wc.wndsurface, NULL);
SDL_UpdateWindowSurface(wc.window);
SDL_Delay(2000);
wc.close();
}
Honestly i'm confused what i'm doing wrong
gleaming mountain
I don't know, I haven't used the library
patent pumice
.
gleaming mountain
try asking in #graphics-gamedev
patent pumice
k
next halo
Why aren’t you using the renderer to draw on the window? And you could extract the texture from the bitmap surface, dump the surface right away and only store the texture pointer then, which you pass to the renderer.
next halo
SDL_Texture* texture = SDL_CreateTextureFromSurface(renderer, imgsurface);
SDL_FreeSurface(imgsurfacee);```
and then
SDL_Rect srcRect = {0,0,64,64}; // change 64. to actual width and height of your source image
SDL_Rect destRect = {100,100,64,64}; // change x and y to position where you want to render
SDL_RenderCopy(renderer, texture, &srcRect, &destRect);
where `renderer` is a pointer to the `SDL_Renderer`which you create like this:
SDL_Renderer* renderer = SDL_CreateRenderer(window, -1, SDL_RENDER_ACCELERATED);
@patent pumice
patent pumice
o
i must be rlly bad at rendering
It is still rendering white
Maybe my bitmap is bad or something
next halo
@patent pumice
Maybe need to add for the actual rendering on screen, after you have created you window, your renderer and retrieved your texture, the full rendering process would look like this:
SDL_RenderClear(renderer);
SDL_RenderCopy(renderer, texture, &srcRect, &destRect);
SDL_RenderPresent(renderer);
if that still gives you a white screen, and you would like to see a different colour ;), add this before the render clear command:
SDL_SetRenderDrawColor(renderer, 255, 0, 0, 255);
Should be red then (RGBA values)
If that still does not work, try converting your BMP to PNG and see if that makes a difference.
if you are still stuck, please repost your modified code for review.
patent pumice
k
next halo
Any progress?
patent pumice
Yes i got it to render but now i am working on rendering sprites
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👍
dusky palmBOT