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.

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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 ...
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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 ...
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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?
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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 ...
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“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 ...
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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 ...
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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 ...
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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:...
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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: ...
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4 answers
614 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 ...
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2 answers
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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? ...
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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 ...
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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 ...
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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 ...
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1 vote
1 answer
201 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": ...
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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 ...
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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 ...
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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 ...
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2 answers
563 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: ...
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1 answer
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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 ...
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1 vote
1 answer
157 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 * ...
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2 votes
0 answers
206 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 ...
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1 answer
172 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 ...
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2 votes
1 answer
351 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 ...
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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?
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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 ...
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1 vote
2 answers
613 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 ...
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1 answer
279 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 ...
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2 answers
225 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 ...
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1 answer
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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 ...
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1 answer
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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 ...
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1 answer
498 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, ...
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3 votes
1 answer
988 views

SDL2 mouse motion event keeps occuring

The code I'm using is like so: ...
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1 vote
2 answers
1k 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 ...
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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: ...
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1 vote
2 answers
261 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 ...
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3 votes
1 answer
3k 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 ...
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2 answers
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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 ...
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242 views

Inverted left & right stick axes in SDL2

I've faced a weird problem with SDL2. ...
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2 answers
3k views

SDL/C++ Keyboard Input

I'm having trouble with key management. Movement works fine but the shooting does stuff that I don't want to happen. Every time I press the arrow keys to shoot it works fine but when I press a key ...
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1 vote
1 answer
78 views

Why do I only receive the first message I send with SDLNet?

I am sending two messages from server.exe like this: ...
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1 vote
1 answer
121 views

Is there a way to duplicate the windows desktop zooming in SDL to make low res pixels look like stylyzed cartoon art?

When you hit the Win key and numpad plus key at the same time it opens the desktop magnifying glass and the effect of this on low res pixel art is to make it look like super cool stylized cartoon art. ...
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4 votes
1 answer
3k views

Why does SDL2 blur pixel art even with SDL_HINT_RENDER_SCALE_QUALITY set to 0?

I am working on a game with SDL2 and having trouble turning off linear filtering when upscaling textures. My game has a bunch of 32x32 tiles. I used ...
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0 votes
1 answer
1k views

How to draw geometric shapes to a texture?

How can I create a texture containing a geometric figure using SDL2? I saw there is a way to convert Surface to Texture, and I also saw that there is a way to draw directly to the screen using ...
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-1 votes
1 answer
512 views

How can I build DOOM (SDL-Version) with MinGW?

I have recently been trying to build this source code here. I am building the original port with SDL infused, not the linuxdoom port and I’m having some issues. What I have tried first: I've ...
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2 votes
1 answer
875 views

Change the image of sdl window with a new one

I will make a game and it has 3 buttons on its menu. Those buttons supposed to change the picture the background of the menu When i click on play, another picture should appear like so I found a ...
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-1 votes
1 answer
190 views

Is my frame rate being calculated correctly?

I'm having a long headache (which may not be that complicated) with this frame rate thing. I already tested several frame rate algorithms, lastly I tested this here and they all gave something strange ...
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1 vote
1 answer
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Weird issue with Member Initializers C++

I'm making a game with C++ and SDL2. I have a class called "text" and a class called "buttonObj" The constructor of "text" is a void function that takes an SDL_Color variable. The first part of ...
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1 answer
1k views

How can I read an image from a binary file?

I'm trying to put all the assets inside a binary file and then trying to read them from the file itself, without scattering all them around in separate folders to let them exposed. What I'm trying to ...
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3 votes
1 answer
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How to properly manage memory in SDL2?

I have yet another question regarding SDL2. I have some drawSprite & drawBackround & ...
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