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 Surface clipping mask

I am creating a GUI for my game, so I use some buttons like . So you can see it is only text surrounded by a rectangle. But I currently use a huge png image with all the buttons I need arranged as I ...
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4answers
810 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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1answer
52 views

Accelerated Motion

I'm making a menu for my game with SDL, when you click on an option a sub menu slides down and is shown, just sliding down is really boring, so I want it to accelerate(like if gravity was pulling it) ...
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1answer
145 views

Drawing geometry to an SDL_Texture?

As a direct result of this question that I asked a few days ago, I want to draw potentially-complex geometry to a SDL_Texture or, I suppose, an SDL_Surface. Ultimately, I want the foreground of a 2D ...
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0answers
66 views

How to create a scripted sequence [closed]

Like countless other video games, I'd like to have scripted sequences in my game. Character 1 says something, the player replies, then a rock falls, that sorta stuff. I could find a way to do it, but ...
3
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1answer
193 views

Calculate the Intersection of Two Volumes

If you've ever played The Swapper, you'll have a good idea of what I'm asking about. I need to check for, and isolate, areas of a rectangle that may intersect with either a circle or another ...
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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 ...
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1answer
77 views

How can I scale a subset of my game view during rendering?

I am developing a 2d game which has a lateral panel and a main panel with the scenario. I want to scale the main scenario to apply a zoom (only the main panel portion of the screen). I think if I use ...
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1answer
845 views

SDL2 window as child of Win32 GUI

I'm building an editor. Is it possible to create a child window of SDL2 within a Win32 gui? (The most obvious page from SDLTutorials works for earlier versions of SDL)
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234 views

Which will be better for a beginner, SDL, SFML or OpenGL? [closed]

I want to make games.For now simple 2D games, but I don't know from where to start. I "know" C++, but i havent worked with classes.I want to begin with game development and I searched in the internet ...
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2answers
900 views

Which library to choose between SDL and GTK for C game Development (Begginer) [closed]

Note: I know that this is a opinion based question I've been programming in C it's been some time, now I want to get into game development but I'm not sure which GUI library should I use between SDL ...
3
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1answer
177 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 ...
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1answer
80 views

Which buffering process would be more efficient?

I'm working on the base engine of my game right now, specifically converting a text file into a level on-screen. As a 2D platformer, each level has an array of rectangles that can be drawn to the ...
3
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1answer
137 views

Collision detection in Pong clone

Well I'm trying to create a pong clone using SDL and I had some problems with the frames and some times the ball would go through the paddles despite the fact that at other times the collision worked ...
2
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1answer
294 views

When should I use color keying vs PNG transparency?

SDL (and other toolkits) can use color keying to make a certain color in an image transparent. Alternatively, you could load a PNG image that supports transparency. When should I use which?
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2answers
2k views

How can I render a texture to the screen in SDL2?

I've recently started upgrading my SDL version from 1.2 to 2.0.3, and while on the SDL Wiki, I've come across SDL_Renderer, SDL_Window, and SDL_Texture. I did some research and found a link at ...
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3answers
418 views

How can I avoid repeatedly setting up SDL in VS 2013?

Do I have to set up SDL 2.0.3 every time I make a new project? I tried putting sdl.dll in system32 so that I don't have to include it in my project folders, but that didn't work.
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3answers
521 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
331 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 ...
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1answer
46 views

Text not being rendered until I recreate the text class in SDL

I made a Text class, it is as shown below: Text::Text(const int score, const float &x, const float &y, const float &w, const float &h, SDL_Renderer *rend) { font = ...
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1answer
138 views

Having issues with pong physics, is my approach wrong?

I've been working on a pong clone, i've made games in the past but they have all been very hacky. This time I was trying to go for a better approach in terms of using OOP or patterns. So far the games ...
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1answer
66 views

Multiple keypresses causing wierd results in SDL

I have been building a pong clone. I've been using a mixture of peoples different code to understand the way they structure their games as well as reading on game patterns. Currently I've gotten to ...
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1answer
602 views

Scrolling with SDL2 & Box2d - My Camera isn't keeping up with my player

I'm trying to get a game on the google play store before I'm 40 (long held dream to publish a game since the days of the speccy), I have just over a month to go so it's not looking good! Foolishly I ...
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3answers
527 views

Make openGL program only update every 1/60 seconds

I'm learning C++ and openGL and have this program as a result from tutorials and playing around. The problem is that the main loop is running at "full speed", making the program unnecessarily cpu ...
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1answer
259 views

SDL_GameController automatic detection

Here's something that's been bugging me all day: Controller detection in SDL. First thing is that it doesn't automatically detect when a controller is connected. Finding out when a controller is ...
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2answers
301 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 ...
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3answers
1k 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 ...
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1answer
351 views

Why does this code to filter events with SDL not function properly?

According to the SDL2 wiki, SDL_SetEventFilter : Use this function to set up a filter to process all events before they change internal state and are posted to the internal event queue. ...
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1answer
520 views

Render two images to an SDL_window

I want to create a menu for an SDL game, so I load an Image to an SDL_Window as the background, then I try to load the next image which will be a button but it doesn't display the button to the ...
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1answer
288 views

Background color gradient with SDL

I want to create a menu for a game using a color gradient as the background. Is there a way to create a gradient background instead of using an image for it (since I don't know what size the window ...
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3answers
5k 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 ...
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0answers
51 views

How do I make a game object move at an angle in an integer-indexed grid? [duplicate]

I'm making a game in SDL2 and C++. I want a way to make any game object move in a specific direction. I've thought of assigning each object a direction in radians, from 0 until 2 PI where 0 would ...
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1answer
130 views

Events management using SDL 2.0

I wrote a simple SDL program using SDL 2.0. I have a little problem when I want to check the mouse wheel events. Actually, in the version 2.0 the flags SDL_BUTTON_WHEELDOWN and SDL_BUTTON_WHEELUP no ...
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0answers
128 views

SDL_FillRect() causes access violation on palletized surface with specific inputs [closed]

SDL2-2.0.1, Windows 7, MSVC 2008. Originally saw this problem with the release SDL libs, debugging now with the development libs. Following is the entire program I'm running, minus error checking for ...
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4answers
3k 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 ...
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2answers
109 views

Collision detection in seemingly random locations [closed]

I have a square that moves around with user input and should return to top left of screen when it collides with one of the rectangles on the screen. It works fine when the the rectangles are not ...
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2answers
126 views

SDL sprite animation problem

I'm currently drawing my character from a single file, and my sprite class handles it taking the file path as an argument. Now, I need to add a simple animation, cycling between two frames. The ...
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2answers
1k views

How can I rotate a bitmap without D3D or OpenGL?

I've just figured out on my own how to scale a portion of a bitmap using PutPixel. I would like to know the mathematical theory behind rotating a bitmap on my own, using per-pixel operations like ...
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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 ...
3
votes
1answer
430 views

How to convert a SDL window to a SDL surface? SDL 2

I am trying to make a paint program and there is a sdl function called IMG_SavePNG() which requires a surface and destination file. How can I turn what I see in the window to a surface?
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1answer
246 views

How to manage screen and input when using libSDL2 for both desktop and Android?

I have worked on libSDL1.2. Since, the release of 2.0, SDL also supports android. So, I am trying to develop game that can work both on desktop and android. But there are few things that are confusing ...
9
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3answers
5k 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 ...
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1answer
279 views

Drawing Colored Geometry in OpenGL using SDL

First off, I will confess I have asked the same question on stackoverflow, but I think this forum might be a better fit. I am trying to combine 2 things using SDL: Draw a webcam feed via an ...
5
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2answers
791 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. ...
0
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1answer
206 views

Why does my SDL code crash when I move the mouse over the window?

Whenever I move my mouse below where the image renders in my game, the SDL window crashes and closes down. I have narrowed the crash down to the bit of code where I check to see if the Escape key ...
0
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1answer
384 views

Texturing a PyOpenGL 3D Cube with PySDL2

So, I've just started learning OpenGL with PySDL2, and I've created a class that will create a cube to the window that I've created with PySDL2. What I'd like to do now, is to figure out a way to ...
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1answer
632 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
203 views

Update and Render logic with interpolation

I am working with C and SDL2 and just wanted some insight as to how to properly apply interpolation to the rendering. EDIT - some clarification, update() input() and render() are just hypothetical ...
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0answers
370 views

Im getting LNK2019 errors using SDL 2.0.1 in visual studio 2013 [closed]

Here are the error codes and Here Is the link to all the code: Error 5 error LNK2019: unresolved external symbol WinMain@16 referenced in function __tmainCRTStartup ...
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1answer
83 views

Why, after calling SetVideoMode as in the following, does nothing appear on my screen?

I am trying to create an application that will need to use double buffering (for purpose of vsync). I am using SDL.NET. From what I understood, in order to have double buffering, I have to ...