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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2answers
90 views

Translating an object in the rotation direction

I am creating a graphical scene with OpenGL and SDL, and I'm running into a problem in regards to translating an object in its rotation direction. Each of the graphical objects in the scene has a ...
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2answers
58 views

SDL draw dynamic select box

this might seem obvious to many, but I'm stuck and I cannot find any tutorial which helped me, so it would be great to find the answer here. I tried to make a rectangle like you have in RTS games, so ...
0
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2answers
79 views

Moving one object from one point to another with acceleration

How would someone implement moving an object from one point in 2D space to another using these formulae to update objects: m_position.setX/Y( m_position.X/Y() + m_velocity.X/Y() * dt + 0.5 * m_acc * ...
0
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2answers
78 views

Segmentation fault adding SDL_Surface

I'm trying to add a new SDL_Surface to my whack-a-mole clone code but even if I set it to null it wont let me. game.h #include<SDL2/SDL.h> #include<SDL2/SDL_image.h> ...
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2answers
78 views

Colour values of a pixel array from a spritesheet image wrong (C++, SDL2)

So basically what i want to do is create a 2D tile based rendering system in C++ that renders each pixel on the screen manually. Rendering an individual pixel on the screen works just fine (or render ...
-1
votes
2answers
286 views

My 2D collision code does not work as expected. How do I fix it?

I have a simple 2D game with a tile-based map. I am new to game development, I followed the LazyFoo tutorials on SDL. The tiles are in a bmp file, but each tile inside it corresponds to an internal ...
2
votes
1answer
80 views

Rendering text with SDL2 and OpenGL

I've been trying to have text rendering in my OpenGL scene using SDL2. The tutorial I came across is this one Rendering text I followed the same code, and I get text rendering fine. However the issue ...
1
vote
1answer
113 views

SDL & OpenGL - Artifacts when multisampling

Im trying to render a model with anialiasing using OpenGL and SDL, but when I do I get strange artifacts. When I render with antialiasing disabled everything looks fine. When antialiasing is ...
0
votes
1answer
55 views

Redefining the SDL rect struct

Upon checking the docs of SDL (1.2) I saw that the SDL_Rect struct defines the x and y as Sint16. I'm making a bitmap font text scroller and I need those specifically to be unsigned ints because the ...
-1
votes
1answer
407 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?
1
vote
0answers
49 views

Where can I get correct pitch parameter for SDL_RenderReadPixels function in SDL2?

I have a texture created with SDL_TEXTUREACCESS_TARGET access and I want to get all it's pixels with SDL_RenderReadPixels() function. One of the function parameters is pitch and I don't really know ...
1
vote
0answers
142 views

OpenGL - Texture disappears

I'm making a simple program with C++, SDL and GLEW. So far it is going great but I ran into a weird problem. One of my four textures would not show up on screen even though it used the same code as ...
0
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0answers
24 views

SDL — What am I doing wrong with SDL_LockTexture()?

I'm trying to use SDL_LockTexture and SDL_UnlockTexture for direct access to pixels in SDL 2.0. When I try to set pixels, I never see anything happen. Here's my code: void *pixels; int pitch; ...
0
votes
0answers
37 views

Pixel buffers in SDL

I'm using SDL and c++ and trying to create a class to work on pixel basics. The buffer is a multidimensional char array. char buff[scW][scH]; The video mode is being set by a ...
0
votes
0answers
91 views

Artifacts rendering high-poly procedural meshes with OpenGL

I am having some issues when rendering some procedural generated meshes. There are some really wierd artifacts when rendering high-poly count meshes (not that much actualy). I have been able to ...
0
votes
0answers
58 views

C++ Visual Studio Sprite Animation Function only setting values for certain Rect structs in SDL

I'm making a game in SDL and I am using an Array of Rects to store values of sprite sheet clip's dimensions. When I call the function and pass in one of my sprite sheet textures with it's ...
0
votes
0answers
81 views

Tile Collision - subtracting a minor value to the box size

I'm having a certain problem when doing collision checks on bounding boxes that have their edges aligned with upper or right tiles. It shouldn't count as an intersection but I don't know a good ...