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.

learn more… | top users | synonyms

0
votes
0answers
32 views

Hidden textures [duplicate]

How do the developers of games "hide" textures from editing. For example in game called Faster Than Light which is made in c++ using SDL. There is no directory with graphic files. How to "hide" ...
1
vote
1answer
37 views

SDL Memory leak with TTF_Font and surface

I am creating 2D game with SDL2, and I have a problem with my label class. Every time I construct new label I have a memory leak, and I don't know what I do wrong! For example, I want to refresh ...
1
vote
1answer
23 views

SDL2: Texture not rendering to screen

I'm trying to render a BMP image, but nothing is showing up other than the draw color. I have most of my code in a header file. [game.h] #ifndef __Game__ #define __Game__ #include <string> #...
2
votes
1answer
102 views

C++ SDL OpenGL minimise / restore window issue

I'm partway through developing a 2D game in C++ using SDL and OpenGL; my IDE of choice is CodeBlocks. I've hit an issue that I can't seem to get around. Basically, if I minimise and then restore the ...
0
votes
1answer
40 views

SDL: Certain bitmap not displaying

I have come across a very wierd problem. Here is my code: #include <iostream> #include "SDL.h" using namespace std; class MyGame { public: SDL_Surface* image; SDL_Surface* window; ...
3
votes
1answer
26 views

Control Entity Moving Speed Without Using a Delay Function

In a Tetris game I'm trying to make (using C++/SDL), I need to control the falling speed of, say, one block. I have successfully done this by incramenting its y value then setting SDL_Delay(200). So ...
0
votes
1answer
51 views

C++/SDL Snake Game: Drawing Tail Crashes Game

I"ve been making a snake game in C++ using SDL (first game and first time using SDL), and I've run into a bug. As the tail of the snake gets longer, the game slows down (snake gets slower), and ...
0
votes
1answer
39 views

Can't read input from keyboard

I'm new to game dev,and I just trying to create my first game,a simple pong game.But i can't handle the keyboard input. This is what i got : const Uint8 * keystates = SDL_GetKeyboardState(NULL); ...
-1
votes
1answer
38 views

Why I'm not getting any kind of output in SDL?

Here's the code that supposed to display the texture: SDL_RenderClear(renderer); SDL_RenderCopy(renderer, mainRaster.getOutput,null,null); SDL_RenderPresent(renderer); The code that runs the update ...
3
votes
1answer
178 views

Having issue's with a confusing access violation? - C , OpenGL 3.3+ , SDL 2.0+

Hello this code seems so well done and yet I'm getting this weird access violation error when I use anything but 0 in glShaderSources 2nd argument : glShaderSource( fragshader, 0, fragfilebuff, NULL )...
3
votes
1answer
53 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 ...
0
votes
2answers
65 views

Resolution scaling

I'm currently working on a project and I'm happy with the UI design: Being the fool that I am, I decided to only design my UI for one resolution, and now that I want to have the user be able to ...
0
votes
0answers
27 views

Box2d capsule stumbles on ground

I am working on a game with box2d and sdl. I Created a character and some boxes as ground, but faced the problem where the character would run a few meters, and stumble on one of the boxes' edge. I ...
0
votes
4answers
82 views

Issue translating objects by one unit in the y direction

I'm currently making space invaders (in OpenGL/SDL) and I'm running into an issue with the movement of the aliens. I have a 2-d vector of aliens (5 rows of 11) and I'm translating each in the x ...
1
vote
1answer
87 views

Sprite quickly disappears after rendering

I'm currently making space invaders and I'm using the game loop pattern as described here. I have an entity class from which there is a spaceship derived class. The base entity class contains all of ...
0
votes
1answer
59 views

Simulate Keyboard Button Press [SDL Library]

I am trying to simulate an SDL keyboard button press (using C). I have looked up the SDL info pages online but I still don't have anything that consistently works. I have the following (removed the ...
1
vote
1answer
77 views

Sprite Sheet Texture not being rendered

I'm making space invaders (in OpenGL/SDL) and I've run into a problem when trying to draw the sprite for the spaceship from the spritesheet. In my entity class, I have a pointer for the sprite that ...
0
votes
2answers
275 views

SDL or SFML: which is the best option if I only want to use OpenGL for my graphics? [closed]

I've read a lot about creating graphics with OpenGL in SDL and SFML over the past few days, and I want to know which one I should pick. As mentioned in most of the things that I've read, both allow ...
1
vote
1answer
89 views

Issue with detecting collisions in Pong

I've been working on making Pong in OpenGL and SDL and currently have both paddles and the game ball set up properly. I have an Object (or Entity) class which is used to instantiate each of the ...
1
vote
1answer
160 views

How can I render a texture to a polygon in SDL2? A fake 3D problem

I am working on a fake 3D game recently. The game is based on the perspective principle and using angular perspective. Here is a screen shot: But the problem is that the walls and floor displayed ...
4
votes
0answers
129 views

Windows vs OSX Performance with SDL, OpenGL [closed]

I have been writing an SDL OpenGL game in c++ for a couple of years now, writing my own engine for the most part (using Box2d for physics). I'm primarily a mac user, so I've been using xCode to write ...
0
votes
3answers
458 views

Cannot load png images to textures with SDL2 in Visual Studio 2015

I'm learning SDL2 with Visual Studio 2015 and I'm trying to draw a 16x16 level with a .map file and 32x32 .png images for tiles (that's 256 tiles) on a 512x512 window. I have both SDL2 and SDL2 Image ...
0
votes
1answer
66 views

SDL Combining text and Geometry Rendering to one texture

Basically I'm trying to end up with a Texture class that can take in text and have it be drawn over simple geometry (such as a letter 'A' over a filled rectangle). However I'm running into issues when ...
1
vote
1answer
96 views

Fixed-Timestep still updating too fast

I'm trying to figure out if I'm approaching my simple fixed-timestep implementation correctly, following examples such as: Gaffer (without RK4), and DeWitters Currently, I have a game object which ...
0
votes
0answers
44 views

How to parse a and displat TMX map object in SDL using tmxparser ?/How to make a platform game using tiled editor and SDL?

I am newbie in this field getting too much trouble in simple platform game for one of my project module if you guys could help or share some code. This is what I have done till now. I could parse a ...
-4
votes
1answer
125 views

Can we port any game written in C++ with SDL to Android platform or we would need to change some codes too? [closed]

Just wanted to lean a cross-platform library!! Since SDL library supports iOS too..
0
votes
1answer
62 views

SDL2 and density-independent pixel

I'm currently using SDL2 on Android and that's my first experience with that library (to be honest, mainly chosen because I'd like to learn it). What is puzzling me is how to deal with different ...
2
votes
1answer
418 views

Why does SDL_RenderCopy result in a blank screen?

I'm trying to render a texture(picture), but SDL_RenderCopy keeps the window's background black. Here's the relevant code: SDL_Rect rect; rect.x = 0, rect.y = 0; while(!quit) { SDL_RenderCopy(...
1
vote
1answer
271 views

Version 320 is not supported, SDL C++

I have the following four lines before I create the window. SDL_Init(SDL_INIT_VIDEO); SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE); SDL_GL_SetAttribute(...
1
vote
0answers
86 views

SDL-2.0 library not working with codeblocks-13.12-mingw-tdm [closed]

I started following lazyfoo's sdl 2.0 tutorials. This is the very first tutorial that explains how to set up SDL 2.0 with code::blocks - SDL 2.0 with code::blocks setup. I am doing exactly what it ...
2
votes
1answer
132 views

OpenGL not rendering textures

i'm using OpenGL 2.1 with SDL2.0 and i'm trying to render a texture, using this steps: load the image: Image* image = new Image(); image->image = SDL_LoadBMP(path.c_str()); if (!image->...
3
votes
1answer
178 views

How can I separate processing input and update?

I know that game loop is broken up into three distinct phases: processing inputs, update, and render, but I just can't see how I can make processing input and update independent of each other. Let's ...
2
votes
0answers
226 views

OpenGL textures make very low fps

I loaded some textures just one time before I go to my mainloop(glutMainLoop). I am using SDL for the texture loading. However, when I compile, my game is running at 6-10 fps. When I don't load the ...
4
votes
2answers
349 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 ...
1
vote
2answers
217 views

OpenGL SDL Texture doing really weird things

I am trying to render a .png image to the screen using C++, SDL and glut. This the texture I made using paint This is what I get on the screen: Does anyone have an idea what could cause this? ...
2
votes
1answer
119 views

Texture Not Rendering in C++ SDL OpenGL(glut)

I don't understand why my texture("texture.bmp"), is not showing on the screen. Please help me. The whole drawing function: ///HERE EVERYTHING IS BEING RENDERED void Main::display(){ int ...
5
votes
0answers
91 views

OpenGL: Frame partially jumps back and forth

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 ...
2
votes
2answers
88 views

Unable to move character to right position using SDL?

I am currently having problem moving a character right and showing him like he's running but after i press right key it moves right for one time and then when i enter left it goes left again but ...
1
vote
1answer
161 views

Why am I getting these artifacts when rendering polygons with OpenGL and SDL from far distance?

I'm working in a toy BSP (quake3 version) renderer. I started creating the context and handling the input with GLFW but then I switched over SDL. The performance change was amazing with SDL leading ...
0
votes
1answer
133 views

Handling input in ECS for multiple characters

I've been reading into Entity-Component-Systems, and they seem rather handy. However, I don't quite understand how input should be handled and after googling and looking thru GDSE posts, I've become ...
0
votes
1answer
277 views

Zooming In SDL 2.0

I'm currently working on a project in which I render pictures raw. That is I use simple IMG_LoadTexture(), SDL_RenderCopy(). I want the program to be able to zoom in/out and textures to be scaled to ...
1
vote
1answer
44 views

SDL.NET no longer detecting modifier keys

I'm using SDL.NET with C#. Recently, a bug has appeared where the library does not detect if the shift key is held down; although it used to do so. private static void KeyboardEventHandler(object ...
0
votes
0answers
34 views

Strange offset when accessing pixels from an SDL surface

I am using a routine to map a triangle from one surface to another. The problem is that the function below chooses the correct pixel to draw on the destination surface, but the pixel selected from the ...
0
votes
0answers
133 views

Creating A Selectable Object in SDL/C++

I'm trying to create a clickable object. I wrote a pseudo code to try it. When I add a new member to object it works fine, that is when I hold the mouse cursor on the rectangle determined it returns ...
1
vote
3answers
238 views

2D Rendering Based On Y Coordinates

I'm trying to build an RPG worldbuilder. I have seperate classes for images. Like this. Object1::Object1(int x, int y, CSDL_Setup *sdl_set, int *p_CamX, int *p_CamY) { X_pos = x; Y_pos = y; ...
0
votes
2answers
159 views

Getting if a key was released/pressed this frame (C++/SDL2)

Getting if a key is currently down is easy. Just return keys[scancode]: switch (ev.type) { case SDL_KEYDOWN: keys[ev.key.keysym.scancode] = true; break; case SDL_KEYUP: ...
1
vote
1answer
328 views

How to use traditional pixel coordinates system in OpenGL? (with C++/SDL2)

I find the normalized, centralized coordinate system used in OpenGL weird and annoying, is there anything I can do at all to make it work like normal pixel coordinates on everything ever except OpenGL?...
1
vote
1answer
181 views

Pathfinding with differently-sized objects on tile map [duplicate]

It's my first RTS game and I'm having trouble finding out how to make infantry take less space than tanks. Right now I have 1 tank and 1 infantry type ready with sprites, pathfinding, selection and ...
-2
votes
1answer
2k views

Porting SDL OpenGL Game to Android and IOS

I am currently learning OpenGL (3.0+) with C++. I am using SDL for input handling, window creation, etc., GLEW to use OpenGL and call OpenGL Functions, and GLM for OpenGL Math stuff. If I fully ...
1
vote
1answer
166 views

Fastest way to render image data from buffer

Currently I am doing my rendering by using a 3D array window_width x window_height x rgb as a buffer, then looping through the buffer and plotting pixels on screen using SDL2 (SDL_RenderDrawPoint). I ...