A message from our CEO about the future of Stack Overflow and Stack Exchange. Read now.

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
25
votes
8answers
9k views

What advantage do OpenGL, SFML and SDL have over software rendering?

I started watching the Handmade Hero stream, where Casey Muratori creates a game engine without using frameworks or such. Yesterday I got to the part where he showed how an image is drawn onto the ...
21
votes
3answers
2k views

Multi-platform multi-threading: What are the real challenges?

While a library like SDL provides a cross-platform wrapper API for threading, I think it would be naive to assume that this leads directly to easy development of games across vastly different ...
16
votes
2answers
20k views

Input management techniques in large games

Is there a standard technique for managing input in large games. Currently, in my project, all input handling is done in the game loop, like so: ...
13
votes
5answers
2k views

What are the benefits of capping frames per second? (If any)

I am working on a simple game in OpenGL, using SDL for display initialization and input, and it appears in terms of timing I have two options available to me. Number one being just sleeping for the ...
12
votes
3answers
11k views

What animation technique is used in 'Dont Starve'? [closed]

While playing a few games in my personal time off development I've stumbled across a survival 2D/3D survival game. The game was apparently made in SDL and GLUT (Dont starve) but what really amazed me ...
12
votes
4answers
14k views

Trap mouse in SDL

How can I trap the user's mouse inside my game? It's not a fullscreen game, but I want it so that the user cannot drag the mouse to outside the screen. Do I have to check the coordinates of the mouse ...
11
votes
2answers
13k views

How to calculate delta time with SDL?

I have heard that you can calculate delta time with two functions called SDL_GetPerformanceCounter and SDL_GetPerformanceFrequency. I'm not sure how they work completely, but I heard it is a bit ...
11
votes
2answers
6k views

What should I worry about when changing OpenGL origin to upper left of screen?

For self education, I'm writing a 2D platformer engine in C++ using SDL / OpenGL. I initially began with pure SDL using the tutorials on sdltutorials.com and lazyfoo.net, but I'm now using SDL to ...
10
votes
1answer
1k views

SDL blitting multiple surfaces at once

I'm trying to write a platforming game where the sprites for the level backgrounds are broken up into 512x512 chunks. I keep 3 chunks in memory at a time and I'm trying to write code to blit all three ...
9
votes
1answer
6k views

Turn-based JRPG battle system architecture resources

The past months I've been busy programming a 2D JRPG (Japanese-style RPG) in C++ using the SDL library. The exploration mode is more or less done. Now I'm tackling the battle mode. I have been unable ...
9
votes
2answers
32k views

Making a 2D Platformer in C++/SDL. Looking for tutorials/examples/resources [closed]

I have a lot of experience with C++, but I have no experience with game programming. This summer I plan to create a 2D platformer from scratch using C++/SDL for the learning experience. I am looking ...
9
votes
1answer
1k views

Why does V8 not run with SDL threads?

i was able to compile and link V8 against my game and code interpretation works fine. However I want to divide my code and the game loop should exist in one thread and the scripting engine should run ...
9
votes
1answer
2k views

Separating logic/update from render/drawing code in a single thread using sleep

I've read that the speed of game objects should not be hindered by FPS but instead should be based on time. How can I seperate the update/draw code to maximize performance without limiting the drawing ...
9
votes
2answers
2k views

How to deal with OpenGL and Fullscreen on OS X

I do most of my development on OS X and for my current game project this is my target environment. However when I play games I play on Windows. As a windows gamer I am used to Alt+Tab switching from ...
8
votes
1answer
15k views

Time based movement Vs Frame rate based movement?

I'm new to Game programmming and SDL, and I have been following Lazyfoo's SDL tutorials. My question is related to time based motion and frame rate based motion, basically which is better or ...
8
votes
3answers
19k views

SDL Function for Loading PNGs

I'm learning SDL 2.0 at the moment and I've seen this method for loading BMPs: ...
8
votes
2answers
3k views

Custom extensible file format for 2d tiled maps

I have implemented much of my game logic right now, but still create my maps with nasty for-loops on-the-fly to be able to work with something. Now I wanted to move on and to do some research on how ...
8
votes
3answers
2k views

What is the contents of the buffer *after* a call to glSwapBuffers()?

(SDL_GL_SwapBuffers() in particular) When you have drawn a scene, and you call swap-buffers, it is routine to then glClear() ...
8
votes
3answers
27k views

How to draw 2D images using OpenGL, in SDL?

After everything, I managed to find a simple piece of code that shows how to draw a 2D image with openGL: ...
8
votes
1answer
6k views

Game class and main function

I have a Game class with my main game functions and instances of game objects like screen, etc. My game is made using C++ and SDL. I was wondering, though, should main be a function of my class? Or ...
8
votes
1answer
4k views

SDL2 with OpenGL — weird results, what's wrong?

I'm porting an app to iOS, and therefore need to upgrade it to SDL2 from SDL1.2 (so far I'm testing it as an on OS X desktop app only). However, when running the code with SDL2, I'm getting weird ...
8
votes
1answer
2k views

Getting OpenGL hardware acceleration with SDL on Linux

I'm trying to use SDL + OpenGL but I don't believe hardware acceleration is working because the framerate for around 18000 polys is about 24fps on a quad core machine but is a hopeless 1-2fps on an ...
8
votes
1answer
285 views

OpenGL: Frame partially jumps back and forth [closed]

I'm working on a project with SDL and OpenGL. The game works great on Windows, Linux, OS X and iOS. However, the Android version is showing a problem on my phone in particular. I have tested another ...
7
votes
2answers
3k views

What features do basic particle engines have?

I created a basic particle system for SDL in C++. It has some basic stuff like an emitter, as well as a simple particle class. It can load a image, or create a dot of a color. And that's it. What ...
7
votes
4answers
5k views

2D Platformer Collision Handling

I am trying to create a 2D platformer (Mario-type) game and I am some having some issues with handling collisions properly. I am writing this game in C++, using SDL for input, image loading, font ...
7
votes
2answers
3k views

Integrate LibRocket With SDL And OpenGL

I been currently involved in a game project and we reach the point we're want to added the GUI for menus and other stuff but the time that we maybe spent developing our own system could cost us a bit ...
7
votes
4answers
14k views

Wavefront *.obj loader in C++

I'm creating a game using OpenGL (via SDL) and C++ (via Visual Studios 2010 Professional). During the game, I will be using 3D character animation. I'd like to use wavefront *.obj files for all the 3D ...
7
votes
5answers
682 views

Graphics module: Am I going the right way?

I'm trying to write the graphics module of my engine. That is, this part of the code only provides an interface through which to load images, fonts, etc and draw them on the screen. It is also a ...
7
votes
2answers
7k views

How do I modify textures in SDL with direct pixel access?

I'm trying to use SDL_LockTexture and SDL_UnlockTexture for directly editing pixels in a texture. I'm using SDL 2.0. Setting the pixel value using the following code doesn't modify the texture: ...
6
votes
3answers
1k views

Is it a good plan to use 2D physics for a 3D racing game? [closed]

I am working on a 3D racing game using SDL and OpenGL. I thought it would be easier to use a 2D physics engine, since I really don't need the 3rd dimension. There will be no flying cars or jumps, they ...
6
votes
4answers
18k views

How can I process continuously-held keys with SDL?

I have created a cube in opengl using SDL. Now I am trying to move the camera in X direction if user presses left or right arrow keys and Y direction if user presses up or down arrow keys. Right now ...
6
votes
4answers
12k views

Rendering multiline text with SDL_TTF

Can you use any function to render more than a line of text in a surface? If you can't do this, what whould be the way to go? I am doing the following: Create a surface (not sure if should be a ...
6
votes
3answers
10k views

SDL2 sprite batching and texture atlases

I have been programming a 2D game in C++, using the SDL2 graphics API for rendering. My game concept currently features effects that could result in even tens of thousands of sprites being drawn ...
6
votes
1answer
6k views

Trap mouse in SDL2

When using SDL 1.2 it the way to implement full screen or windowed applications with "no cursor" you did the following: ...
6
votes
1answer
221 views

How can I implement a dialogue where the words appear as if they were being typed?

I'm planning on putting a dialogue system into my game, I don't really work with surface so my way of implementing SDL_Ttf is by turning it into a texture, in other words, every paragraph would be ...
6
votes
3answers
1k views

SDL Multiple keyboard support

I am making a game with multiplayer split screen mode using SDL. Basically, I like the idea of having each player plug in his own keyboard to the PC, set custom controls via options and being able to ...
6
votes
2answers
5k views

How should I manage level progression?

In my code, I just have a Level class right now in the main game loop that just blits a background and spawns some enemies for testing purposes...But I can't figure out how to go about implementing ...
6
votes
2answers
2k views

Rotating object around moving object/player in 2D

I am trying to implement a camera which rotates around the world around the player. I have found many solutions online to the task of rotating an object about the origin, or about an arbitrary point. ...
5
votes
4answers
3k views

Should the main game object be static in c++

I am creating a 2d platformer using SDL and I was thinking that my game object could be static, but I wasn't sure if this was a good idea. The pros (that I can see): Accessing settings options (such ...
5
votes
2answers
2k views

Do I really need to clear the renderer every iteration?

Just a quick question about fine-tuning/optimization. If I'm making a 2D platformer with a parallax-scrolling background (meaning no two frames are the same) do I really need to clear my renderer for ...
5
votes
3answers
19k views

How can I implement a main menu?

I have been following the tutorials at http://lazyfoo.net/tutorials/SDL/index.php and although they are all very well written and I have learned more than I would have on my own, I am not sure how to ...
5
votes
3answers
948 views

Current library situation [closed]

Allright so I've been doing some searches, here what I got: SDL: It is a standard, very mature but very old. (I got posts of late 2009 where they were still waiting for the 1.3 to come up...we are ...
5
votes
1answer
2k views

Setting up OpenGL 3.3 in SDL 1.2

I've been using SDL 1.2.14 for awhile without using many of the features from newer OpenGL versions. I'm now interested working only with the 3.3 API (not using the deprecated functions, etc... that's ...
5
votes
1answer
864 views

Does SDL running on Mac OS not recognize Xbox controllers?

I'm trying to learn a bit of SDL, and have been bouncing between Windows and Mac platforms, but am noticing that an SDL program running on my Macbook doesn't recognize the presence of the Xbox ...
5
votes
4answers
10k views

Most effective way to manage a gamestate system that is easy to use?

I just started working on my game, mostly the game management. I plan and using game-states to make the menu's and other stuff easier. My main idea for implementing the game-states is creating a game ...
5
votes
2answers
1k views

How to use SDL_TTF's outlines

This might be a basic question but googling isn't turning out anything useful: How are we supposed to use TTF_SetFontOutline ? I know we're able to create an outline (and it looks alright) but since ...
5
votes
1answer
3k views

How can I optimize per-pixel drawing in SDL?

I've been messing around with C++ the last few days and I'm trying to figure out how to draw the screen pixel by pixel each frame. It sounded simple enough at first, but then I realized for loops ...
5
votes
3answers
3k views

Should I cap the frame rate in SDL?

I know this question has been asked a lot, but I never found an answer suitable for me. I have a game with a fairly big logic system and the movement system I am currently using is calling ...
5
votes
2answers
4k views

How to hide assets from user? ( e.g.: a png file )

I think the title is quite self-explaining, still this is a big area I think, so let me drop a few words: I've got a simple experiment game project going, and I want to make sure, that the user isn't ...
5
votes
1answer
3k views

OpenGL textures loaded with SDL_Image display with no alpha

I am making a game using OpenGL, with SDL_Image employed to load the textures. When drawn on screen, there's no alpha -- in an exact square around the opaque contents of the texture, black is drawn; ...