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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1answer
397 views

Black or White Border/Shadow around PNGs in SDL/OPENGL

having the same issue as this: Why do my sprites have a dark shadow/line/frame surrounding the texture? however, when I do the fix suggested there (changing GL_SRC_ALPHA to GL_ONE) it just replaces ...
5
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2answers
829 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. ...
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1answer
199 views

Brief pause after keypress

After i press and hold the key it goes forward once then pauses for a second or less then goes forward on forever. My problem is the brief pause I cant locate the issue. Thanks for your help. ...
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2answers
3k views

Altering pixel value in an SDL2 texture

Alright, I have spent a lot of time on this one, so I need some help. I like the ability to draw pixels directly to the screen, sometimes I do this to trace the path of objects for debugging etc. In ...
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1answer
266 views

Using interpolation to traverse waypoints

I'm making an isometric turn based strategy. Characters can move between tiles and tiles only, so I made a function for moving one tile in any direction. Regarding path-finding, I implemented A*, ...
2
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1answer
247 views

How to implement scripted events?

I'm building a game in C++ (using SDL) for a college project, I'm trying to figure out how to script events that happens when a player does something, or some time passes etc. I have a and idea of ...
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4answers
930 views

SDL zooming/upscaling without images becoming blurry?

I'm working on a game with 32px tiles and I have one question regarding this and scaling. When I try to see my game fullscreen my image just becomes blurry. I remember playing NES games and when the ...
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2answers
254 views

Pixel size for clips in retro NES-like game?

I'm making a retro videogame, currently I'm using 32px x 32px tiles for the map and 64px x 32px for the characters. However the game looks extremely small, I could increase the tile size to something ...
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1answer
162 views

Sound upsample using SDL

We have managed to play audio files using SDL's Mix_PlayMusic function. The problem now we need to do some upsampling for one audio to match the other so that both have same duration. Any idea how to ...
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1answer
1k views

How do I access the pixels of an SDL 2 texture?

How exactly can one get to the RGBA pixel arrays of SDL 2.0 textures? Does the texture need to be specially initialized and locked down?
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2answers
636 views

How do I implement collision detection with a sprite walking up a rocky-terrain hill?

I'm working in SDL and have bounding rectangles for collisions set up for each frame of the sprite's animation. However, I recently stumbled upon the issue of putting together collisions for ...
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1answer
2k views

SDL2 render to texture support

I'd like to use the function int SDL_SetRenderTarget(SDL_Renderer *renderer, SDL_Texture *texture) in my 2D game. At this point I am using only the SDL 2.0 API, and using openGL seems overkill to ...
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5answers
1k 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 ...
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1answer
114 views

Luminance increase in SDL

We have managed to create grayscale picture using the following snippet of codes in SDL. What we need to do now is how to first convert into YUV or YCrCb for it be able to set the luminance value and ...
0
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1answer
661 views

SDL gray scale image from a a color image?

I am new to sdl. I have basically have the following codes which can load the images. I know how to access the pixel as below. What I need it to convert the image to 8 bit grey level and 1 bit ...
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1answer
303 views

SDL tiles rendering

I'm pretty new to SDL and wonder what is better if I have to draw tiled map on screen: to SDL_RenderCopy each tile from texture(which presents tileset) and then SDL_RenderPresent it every frame or to ...
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2answers
339 views

How to move player based on existing Game state?

I'm trying to build a basic platforming game in C++ using SDL, and I've encountered this issue enough to know that there's something I'm missing. What I'm working with, at the most basic level, is ...
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2answers
4k 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: while(SDL_PollEvent(&event)){ ...
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1answer
1k views

Is SDL a game engine? [closed]

I would like to ask if SDL is considered a game engine, or just a library like Open and Direct3D?
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2answers
2k views

SDL Function for Loading PNGs

I'm learning SDL 2.0 at the moment and I've seen this method for loading BMPs: SDL_Texture* LoadImage(std::string file) { SDL_Surface *loadedImage = nullptr; SDL_Texture *texture = nullptr; ...
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2answers
6k views

SDL 2.0 setup on code::blocks using gcc(MinGW) on win7 [closed]

I have recently installed code::blocks on my system running windows 7 home premium 64-bit, and wanted to start learning SDL. The code::blocks executable is the one installed by the ...
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1answer
400 views

How is destructable terrain made in SDL?

I'm looking for terrain that gets removed in chunks (like in Worms, of instance). How do you do this in SDL?
2
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1answer
454 views

2D Circular View/Background Wrapping SDL for Game

In the games such as Defender (1980 arcade) and Defcon, the player can move/scroll in one direction infinitely because the level/terrain simply wraps over and over again(like if it was wrapped around ...
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1answer
1k views

OpenGL + SDL Linking Problem [closed]

So I'm trying to write a simple application with SDL 1.2 and OpenGL. This a stripped down version of the code containing the one problem I'm having. //The headers #include "SDL.h" #include ...
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1answer
134 views

SDL 1.3 on Windows 7. Better hardware,lower FPS [closed]

I've just moved from one PC to another.I've been developing a game in SDL with SDL_image and SDL_ttf for about one year. On my old pc, I had about 90 FPS on my game, but now I have about 30, witch I ...
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0answers
59 views

Glowing Effect and Blending [duplicate]

I am using C++ and SDL and I am trying to get lines with a glowing effect as provided by the image of the game Defcon on the continental outlines. How could I achieve this glow and blend of the ...
2
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3answers
510 views

Efficient Collision Detection With Numerous Objects at Once [duplicate]

I am developing a 2D game with very large levels in which two teams(around 200 objects per team) fight against each other in planes, tanks, turrets,...etc. With every entity shooting bullets at their ...
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1answer
70 views

SDL - BlitSurfaced Background Slowing Time Based Movement

Whenever I use BlitSurface to apply a background image, the movement of my characters is slowed drastically even though I have movement based on time: SDL_BlitSurface( background, camera, screen, ...
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1answer
56 views

Reverting the view SDL

So in my SDL application, which I setup for OpenGL, if I were to do the following code: glBegin(GL_QUADS); glVertex2i(0, 0); glVertex2i(50, 0); glVertex2i(50, 50); glVertex2i(0, 50); glEnd(); The ...
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2answers
5k views

How to implement SDL Button/Menu GUI with callbacks?

I have been reading Bjarne Stroustrup's Programming Principles and Practice Using C++ for a while now and am nearing the end of the book. I have to tried to make a very simple game using the SDL ...
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1answer
59 views

SDL text or additional images not loading

I've got a basic side scroller that allows the user to run and jump around. I've used various tutorials to get this far, but I can't seem to get any text to render, no matter what method. I also can't ...
2
votes
1answer
2k 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: SDL_ShowCursor(SDL_DISABLE); SDL_WM_GrabInput(SDL_GRAB_ON); See Trap mouse in ...
5
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1answer
433 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 ...
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1answer
548 views

OpenGL/SDL2 window stopped rendering [closed]

I have been working on a game engine for a couple of days now and I've had it rendering a colourful cube and playing sounds in OGG format, but, after refactoring my code-base to make things easier; it ...
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1answer
420 views

SDL Access Violation

I've created a SDL game project and this window popped up while trying to compile: First-chance exception at 0x00000000 in SDL_Game.exe: 0xC0000005: Access violation executing location 0x00000000. ...
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votes
1answer
278 views

C++ SDL/SFML advancing help [closed]

I've been playing around programming using SDL and SFML for a while now and done all the basic tutorials I can find(love lazyfoo). but I'm stuck and not sure how to move on from simple games like ...
0
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1answer
340 views

Why do I see this “ghosting” effect with my sprite in SDL?

I'm using SDL to create a 2D side-scrolling platformer, but I'm getting ghosting from the sprite. I'm not used to programming with graphics or SDL so excuse any stupid remarks I make. Here's the ...
3
votes
1answer
384 views

Why (SDL) animated filled-circle leaves trail of movement?

I'm trying to achieve proper animation using SDL. Used flags are SDL_HWSURFACE and SDL_DOUBLEBUF. That what I'm getting is technically smooth (I think), but I can figure out what should I do to ...
0
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2answers
255 views

joystick movement for Geometry Wars clone

I am kinda new in game programming, but I've got a semestral work to make a game, so I decided to do a clone of Geometry Wars. Despite that the game is really simple (in principle), I have ran into a ...
1
vote
1answer
414 views

SDL_Image and typical SDL BMP loading fails completely

been messing with OpenGL and SDL for a pair of weeks. The thing is quite weird. I have been loading a texture from a BMP and using a really easy shader to make it work, and so far it has worked very ...
4
votes
3answers
342 views

sdl: unlock mouse in fullscreen mode and make it useable on another monitor

Is it possible to unlock the mouse in fullscreen mode so that you can use it on a another monitor? I read trough the SDL documentation, but I couldn't find anything related to my problem.
3
votes
3answers
1k views

Unable to detect continuous keypress event in SDL

I am developing a game using SDL, and am unable to do continuous motion for my object when a key is held down. I'm calling SDL_PollEvent() to retrieve all events during a frame, and passing each ...
0
votes
1answer
403 views

SDL_types.h file not found using xcode

Getting this error when trying to use SDL_mixer... SDL_types.h file not found.. I am including all the correct files as far as I can tell and have included the frameworks (both SDL and SDL_mixer) ...
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2answers
858 views

My SDL Game executable cannot run outside codeblocks

After compiling and running SDL programs successfully inside CodeBlocks, when I run them outside CodeBlocks (by clicking .exe file) my program does not run. Instead, it says that libstdc++6.dll is ...
4
votes
3answers
3k views

Smooth Sprite Movement - Don't Add Velocity to Position?

I am trying to figure out if there is a way to move a sprite smoothly on the screen at different speeds without stuttering, but keeping the effect that it's moving smoothly; especially at faster ...
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votes
1answer
421 views

SDL_BlitSurface does not works

I have an issue with the SDL_BlitSurface... When I blit (SDL_BlitSurface) in a transparent (background) surface, it does not blits, actually I tried all the existants functions ...
2
votes
1answer
2k views

Is basic SDL hardware accelerated?

I'm going over some SDL tutorials aimed at creating 2D games. However, when I create a basic SDL program - is it hardware accelerated? Or is hardware acceleration only relevant when it comes to 3D ...
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3answers
556 views

Can Simple Direct Media Layer be used with WebGL?

I have read that on desktop OpenGL + SDL is a great way to learn. In looking at WebGL I couldn't find a Web version of SDL. On their site I see bindings for all sorts of languages, but no JavaScript. ...
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1answer
280 views

SDL.NET vs SDL C++

I am currently transitioning from XNA to SDL, and was wondering if SDL.NET provides the same benefits as SDL C++. Considering that SDL.NET uses the .NET framework as a wrapper to the SDL base ...
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1answer
203 views

SDL deleting an image from the screen?

Well, I'm sort of a beginner to SDL, and I was wondering how one would go about deleting an image from the screen and replacing it with another? I attempted to do this, but it didn't seem to change ...