So I wanted to put this here, as I’ve been beating my head against it. It seems like a bug, but I wanted to make sure I’m not missing something (as is often the case). I’ve worked with SDL2 for some time (though only as a side hobby) and I wanted to give SDL3 a whirl.
When I use SDL_CreateTextureFromSurface(), the resulting texture when destroyed does not seem to return all of the memory back to the system. When racing, I’m getting a memory leak that expands by about 2-3MB per second. And even given time, it never stabilizes, continuing to grow.
I’ve run the exact same program creating a dummy surface directly (SDL_CreateTexture()) and the memory use is dead stable.
Code below:
#include “SDL3/SDL.h”
#include “SDL3/SDL_ttf.h”
int main(int argc, char* args)
{
SDL_Window* window;
SDL_Renderer* render;
SDL_Init(SDL_INIT_VIDEO|SDL_INIT_EVENTS);
window = SDL_CreateWindow("Window", 1600,1200,0);
render = SDL_CreateRenderer(window, NULL, SDL_RENDERER_ACCELERATED);
SDL_SetRenderDrawColor(render, 0x00, 0x00, 0x00, 0x00);
SDL_SetRenderDrawBlendMode(render,SDL_BLENDMODE_NONE);
//=========FONTS=========
TTF_Init();
TTF_Font * font;
font = TTF_OpenFont("assets/MyriadPro-Bold.otf",50);
SDL_Color color = {255,255,255};
bool running = true;
SDL_RenderClear(render);
while(running)
{
// Event Loop
SDL_Event e;
if (SDL_PollEvent(&e) > 0)
{
switch(e.type)
{
case(SDL_EVENT_QUIT):
running = false;
break;
}
}
// Create Surface with Text
SDL_Surface * surface = TTF_RenderUTF8_Blended(font,"Test Text",color);
// Test 1: Create Texture from Surface
SDL_Texture * texture = SDL_CreateTextureFromSurface(render,surface);
// Test 2: Create Texture Manually
// SDL_Texture * texture = SDL_CreateTexture(render,SDL_PIXELFORMAT_RGBA8888,SDL_TEXTUREACCESS_STATIC,10000,10000);
// Destroy Surface
SDL_DestroySurface(surface);
// Clear Render, Draw Texture, Show Texture
SDL_RenderClear(render);
SDL_RenderTexture(render,texture,NULL,NULL);
SDL_RenderPresent(render);
// Destroy Texture
SDL_DestroyTexture(texture);
}
return 0;
}
For the record, I tried the exact same code (with the renamed functions) in a fresh project with SDL2.30, and had no memory leak…
Any thoughts and I would be most appreciative.
