Skip to main content
Share Your Experience: Take the 2024 Developer Survey

Questions tagged [sdl]

Simple DirectMedia Layer (SDL) is a cross-platform multimedia library designed to provide low level access to audio, keyboard, mouse, joystick, 3D hardware via OpenGL, and 2D video framebuffer.

Filter by
Sorted by
Tagged with
0 votes
1 answer
48 views

Sprite goes slow with some keys while withh others faster

I'm making a SDL and C++ game engine and I don't know where I'm failing. Here iss my code: Game.cpp ...
prestamo ordenador's user avatar
0 votes
1 answer
95 views

encapsulation, structs and global variables?

I have worked on creating a gameloop and so far all of the code was inside a main.cpp file and I want to separate it into different files. Which caused several problems: My code is separated into 3 ...
snow_owl's user avatar
0 votes
0 answers
43 views

non-class type error with SDL_Rect

I am building a pong game in SDL2 as my first assignment for my game development class. I've encountered an error involving SDL_Rect that I can't figure out. I am ...
Derek Kwon's user avatar
0 votes
0 answers
47 views

How to re-design the graphics logic behind my game to preform better?

Recently, I have been working on a small "pet-project" of mine in C using the SDL library. I have noticed that without my render-calls, my project takes up 2% of the CPU and with the render-...
Renadil's user avatar
1 vote
2 answers
178 views

Bullet Physics Multi-threading Rigid Body transform jittering issues across threads

I've been working on a game using Bullet Physics for C++ as well as SDL for the windowing (with OpenGL) I've recently threaded the game, so that a separate while loop runs the Physics Simulation, ...
jasonmzx's user avatar
0 votes
1 answer
109 views

How to achieve smooth camera dragging with the mouse in SDL2?

I am working on a 2D isometric perspective game using SDL2 and I would like to implement the ability to pan the map when the right mouse button is held down. I was wondering what is best way to set ...
lancen's user avatar
  • 33
0 votes
0 answers
124 views

Separating Game code and Engine code

I've decided to take on a challenge of making 16 c++ games based on this challenge from FamTrinli, I'm using SDL + OpenGL. I've created a simple 2D game in the past, but I didn't like the code ...
koogel's user avatar
  • 79
0 votes
0 answers
146 views

How do you load/store assets?

I'm new to C++ and SDL2 and for the past few days I've been trying to figure out what to do with/how to handle assets for my game. I'm using an asset pack that includes 4 characters and each character ...
Konjointed's user avatar
0 votes
1 answer
35 views

OpenGL ES + SDL texture can only be moved with the combination of two keys

I making a simple game following JoeyDeVrieses guide on OpenGL, I followed the guide and created an input system, which handles the keyboard inputs and quitting the application, the issue is I cannot ...
koogel's user avatar
  • 79
0 votes
0 answers
56 views

SDL Frame Independent Movement Issues

I am using SDL2 with C to program a frame independent movement. I have a struct that defines a position of a sprite (its top left corner): ...
Stone Paul's user avatar
0 votes
1 answer
67 views

Arrow key presses stop affecting game after pressing them 4-5 times

I'm trying to program a simple space shooter and my goal right now is that when the player presses down and holds a key, the ship accelerates to a max velocity. I have that somewhat; the problem is ...
Kevin Shaughnessy's user avatar
0 votes
0 answers
80 views

SDL_BlitSurface() 'dstrect' - Not working as I expected

I am new to SDL but have used C++ a fair bit over the years. I'm struggling with displaying sprites with a scale. EG. Here I am trying to draw a grid of squares (ie. Tetris) but the source BMP is ...
I_Keep_Trying's user avatar
2 votes
1 answer
1k views

SDL2 memory leak

I've been creating a 2D game in sdl2 in C and within my main game loop, I have found a section of code that causes a massive memory leak in my program, roughly leaking 100MB of memory per second. The ...
Bilal Ahmed's user avatar
0 votes
1 answer
558 views

Does the function SDL_DestroyWindow() free the memory allocated by the renderer(s) in it as well?

I know the renderer frees memory allocated for its textures when destroyed but is this the case with SDL_DestroyWindow() as well?
the_antagonist9509's user avatar
1 vote
1 answer
128 views

Stride: Gamepad (DS4) Input Not Working in CSharpBeginner Example

I have only Microsoft build tools and Visual Studio Code installed (not Visual Studio). The CSharpBeginner example from the Stride Game Studio seems to generate, build and run fine using the Game ...
user154681's user avatar
0 votes
1 answer
589 views

“undefined reference to” error when compiling for MinGW

I tried to move to MinGW to compile my program, since I am trying to use a more recent OpenMP version than the 2.0 one used in Visual Studio. I was planning on using ...
JK Tech's user avatar
0 votes
0 answers
163 views

In what ways does SDL add value beyond just graphics?

I'm in the process of learning SDL. On their webpage, they tout that commercial games (like Valve's Humble Bundle) use the SDL libraries. However, it seems like most of these games have more advanced ...
Izzo's user avatar
  • 113
1 vote
1 answer
2k views

How can I directly write pixel data in an SDL window using surfaces?

I'd like to directly modify pixels in my window in SDL 2. I expect this code to display an entirely red window, but instead I'm getting an all black window. I'm able to get it working if I directly ...
Jack M's user avatar
  • 173
1 vote
1 answer
474 views

Getting a surface compatible with the texture / renderer

I'm trying to convert my emulator to SDL2 (from SDL 1.2). As I'm drawing pixel per pixel, I follow "If your game just wants to get fully rendered frames to the screen" in the migration guide:...
Colin Pitrat's user avatar
0 votes
0 answers
368 views

State machine in C for SDL game

I want to create a state machine for menu in my SDL game. So this is my code without the SDL I just want to ask if this is a good way to create it. here is a code: ...
matthews's user avatar
0 votes
4 answers
2k views

Should I bother with SDL_WaitEvent?

When I wrote my first application in SDL, it looked like this: while (!quit) { SDL_PollEvent(&event); switch (event) { // ... } } But ...
Jack M's user avatar
  • 173
2 votes
2 answers
745 views

SDL_SetColorKey in SDL c++ removes most of the white pixels but there is a border around my character

I have drawn all of the images of my sprite in paint. Is there a way to remove all white pixels? ...
Duncan Blais's user avatar
0 votes
0 answers
261 views

How to implement jumping on the left and right?

I am trying to make a platform game in C++ and SDL2. I tried to add a jump in the update() function of the main code below , but it does not work as expected, as you can see in the video: Note: I did ...
The Thinker's user avatar
0 votes
0 answers
232 views

SDL2 - show a tooltip at the cursor that displays RGB of the pixel under the cursor?

I'm writing an SDL2 program, in which I create a SDL_CreateWindow and get its SDL_GetWindowSurface, then I prepare some pixel ...
Kagaratsch's user avatar
0 votes
0 answers
1k views

SDL2 for hardware accelerated graphics?

I am attempting to make a 3d game using SDL2 just to learn and have a bit of fun. I was wondering if there is any way to get SDL2 do calculations on GPU. I have read that SDL2 Textures uses GPU for ...
Apple_Banana's user avatar
1 vote
1 answer
781 views

Polling events with SDL results in stuttering response when dealing with multiple objects

I'm new to SDL programming and I'm not quite sure I got how it handles events. Given an instance like this defined in "game.c": ...
Gian's user avatar
  • 113
0 votes
0 answers
414 views

Is making an acceptable 3D engine possible using only SDL_* functions?

I've been watching Javidx9's 3D engine series and I decided to start making it with SDL because it was something I had heard of and seemed simple enough. I'm not going to implement too complex ...
Architect's user avatar
  • 111
1 vote
1 answer
2k views

Creating a game on Linux with SDL and distributing it

TL, DR: Will I be able to get a single .exe file which will work smooth in a PC which does not have SDL or so installed ever. If not, how close will be the closest ...
muyustan's user avatar
  • 111
11 votes
1 answer
8k views

In SDL, what is the difference between using a Surfaces and a Renderer?

I am new to SDL and I've been following some tutorials; in one tutorial he used Surfaces (a window surface and image surface) and a BlitSurface function to draw images without using any renderer (used ...
alexmoran's user avatar
  • 111
1 vote
2 answers
1k views

Rotate Sprite towards mouse cursor SDL

I have trouble to make my sprite(Arrow) to point at the position of my mouse cursor but i don't get the Right results. I've tried this: ...
PhilCo's user avatar
  • 33
4 votes
1 answer
1k views

C++ Wrapper class for raw pointer to an SDL_Texture

First time in game dev, so go easy on me. I understand it's senseless to copy textures, but I'm trying to see this from a copy/move perspective since there is a lot of that going on in my code and in ...
monolith937's user avatar
1 vote
1 answer
209 views

The A * algorithm in the map has many moving objects

I am using the A * algorithm for my game, it is a kind of Isometric map with lots of tiles. If all the game objects are trees, rocks, houses and only one game object is a moving hero, the A * ...
Traistorm's user avatar
2 votes
0 answers
298 views

Structure for a strategy game

I am making a strategy game like Age of Empires. It's a pretty big project and I need a clear game structure. I have defined a Game_Object class with variables ...
Traistorm's user avatar
0 votes
1 answer
313 views

Identify an object currently selected in the game

I am making a 2D isometric game that uses the mouse. When I left click on an object, this object should be selected, but how do I determine what object that's currently selected and show a halo around ...
Traistorm's user avatar
2 votes
1 answer
620 views

Making text scroll correctly with a textbox

So let me just get this right out of the way, I'm using SDL1.2 (Lispbuilder-sdl specifically, as I'm using Common Lisp), so on to the problem. I'm trying to make a scrollbar that can scroll text in an ...
Lalzy's user avatar
  • 31
0 votes
1 answer
1k views

How can I scale my window in SDL 1.2?

I'm trying to scale my window, for example from 440*420 to 320*240. How can I easily do this?
Aresiel's user avatar
0 votes
0 answers
101 views

Blitting multiple SDL_Surface texts on top of an empty SDL_Surface results in strange outlines

I'm trying to create a single SDL_Surface that has multiple lines of texts stacked on top of each other using SDL2. When I create a single ...
seamaster's user avatar
  • 101
1 vote
2 answers
910 views

C++ OpenGL texture warping

I'm currently doing simple 3D drawing in OpenGL but I have hit a roadblock I just can't seem to get around. The problem is happening with trying to load .obj files. I've written my own .obj reader. I ...
RayShawnOfNapalm's user avatar
1 vote
1 answer
605 views

How to make texture for text displaying using SDL ttf with good performance?

In my game, there are many units and for each units there's an information widget attached next to them. I use SDL as the game rendering engine. I currently want to display their ID for debugging ...
truvaking's user avatar
  • 131
0 votes
2 answers
247 views

How can I benefit when I don't use gpu?

I am trying to make a 3D game with C++, SDL, and OpenGL. My program roughly looks like this: control function has only CPU operations. draw function has CPU and OpenGL functions operations. I just ...
Emre Kaya's user avatar
  • 535
0 votes
1 answer
1k views

How should rendering be structured using SDL?

This question is probably well documented but I can't find any resources. Basically I'm not sure how to structure rendering with SDL in my code. I made a render class which calls the api and the ...
dukevin's user avatar
  • 109
0 votes
1 answer
2k views

Why can't this simple SDL app be closed without task manager or rapid clicking of x button?

I wrote a simple app that generates a window, a raster, and redraws the raster once every 16ms. Right now the calculations are empty, it just draws a solid color. I don't know how, but I have created ...
Bluebomber357's user avatar
1 vote
1 answer
754 views

SDL Sliding Collision

I'm working on a 2D SDL C++ project, and I'm having a bit of trouble with collision detection. Currently the player collides with the edges of the level and with the SDL_Rect objects in the level, ...
st_nick5's user avatar
3 votes
1 answer
1k views

SDL2 mouse motion event keeps occurring

The code I'm using is like so: ...
LASER BEAR ASSAULT UNIT's user avatar
1 vote
2 answers
2k views

OpenGL draw functions and multi-threading. How they work together?

I want to apply multi-thread in a simple way to control and draw 4000 objects. I am using SDL and OpenGL. control : locations, collisions, calculations ... etc draw : OpenGL draw functions ...
Emre Kaya's user avatar
  • 535
1 vote
1 answer
938 views

Should I call SDL_ConvertSurface right before SDL_CreateTextureFromSurface?

Is there a significant benefit (or any benefit at all), when I convert SDL surface and create a texture from optimized surface? Here is example of what I mean: ...
Jakub Bures's user avatar
1 vote
2 answers
445 views

Is it possible to make desktop visible behind drawn object using SDL2?

I would like to draw an avatar over the desktop, something similar to those word 97 assistants, my idea so far is to make only the background transparent but I haven't had any luck, any suggestion? is ...
Daniel's user avatar
  • 11
5 votes
2 answers
4k views

How do I check if a window has focus in SDL2?

Is there a replacement for SDL_GetAppState function in SDL2 from older SDL versions? Why was it removed? I want to use it so I can check if the user has focused the ...
Pins's user avatar
  • 569
0 votes
2 answers
746 views

SDL2 only renders a single image

As an attempt to learn SDL on C, I decided to try and create a simple Pong program using it. My problem now is that of the textures I've given it, two paddles and a ball, only the ball is rendered. It ...
C͝͡e̷͢pt̡̕i̴̸͘u͜͠͝m's user avatar
0 votes
0 answers
420 views

Inverted left & right stick axes in SDL2

I've faced a weird problem with SDL2. ...
Beyondo's user avatar
  • 111

1
2 3 4 5
9