What is a surface in SDL?

An SDL surface is just an image data type that contains the pixels of an image along with all data needed to render it. SDL surfaces use software rendering which means it uses the CPU to render. It is possible to render hardware images but it’s a bit more difficult so we’re going to learn it the easy way first.

What is a variable of type Sdl_surface used for?

An SDL variable can be used to contain a color value, but in that case you need to define the variable using a string. Once a variable is assigned a value, the value will be substituted for the variable name by the preprocessor wherever it occurs.

What is pitch in SDL?

Pitch is the width of the texture times the size of a single pixel in bytes. E.g. for a 800×600 texture with 32-bit pixels (4 bytes), the pitch would be 3200 (800 × 4).

How do you draw points in SDL?

Draw multiple points on the current rendering target.

  1. Syntax. int SDL_RenderDrawPoints(SDL_Renderer * renderer, const SDL_Point * points, int count);
  2. Function Parameters. renderer.
  3. Return Value. Returns 0 on success or a negative error code on failure; call SDL_GetError() for more information.
  4. Version.
  5. Related Functions.

What is SDL renderer?

SDL_Renderer is a struct that handles all rendering. It is tied to a SDL_Window so it can only render within that SDL_Window . It also keeps track the settings related to the rendering. There are several important functions tied to the SDL_Renderer.

What is SDL texture?

In SDL2, hardware rendering is done via structures called SDL_Texture and SDL_Renderer. Texture is a general term used for the resources that are going to be used by the GPU for rendering purposes. SDL_Texture don’t have any methods to get the image for rendering. In order to do that, we use SDL_Surface.

Does SDL2 use OpenGL?

SDL uses OpenGL as a hardware renderer for content that wants hardware rendering on some platforms. If you have such a platform, then OpenGL is the underlying API over which SDL is an abstraction.

What is SDL GFX?

The SDL_gfx library evolved out of the SDL_gfxPrimitives code which provided basic drawing routines such as lines, circles or polygons and SDL_rotozoom which implemented a interpolating rotozoomer for SDL surfaces. The current components of the SDL_gfx library are: Graphic Primitives (SDL_gfxPrimitves. h)