The Agar sdlgl driver provides an interface to the Simple DirectMedia Layer (SDL) library version 1.2, and renders GUI elements as OpenGL primitives and managed textures.

Using AG_InitVideoSDL(3) as opposed to AG_InitGraphics(3), it is possible to attach Agar to an existing SDL display surface. If the SDL surface has the SDL_OPENGL flag set, Agar selects the sdlgl driver automatically.

AG_Driver(3)-> AG_DriverSw(3)-> AG_DriverSDLGL.

debug	Capture GL_DEBUG_OUTPUT errors.
joy	Enable joystick input device support.
stereo	Request a stereoscopic visual.
width	Width (in pixels, in % of total desktop or "auto").
height	Height (in pixels, in % of total desktop or "auto").
depth	Depth (in bits per pixel or "auto").
fpsMax	Limit refresh rate in frames/second (e.g., "60").
out	Dump video frames to JPEG or PNG image files. The filename path may include a printf-style (with frame number as argument). For example, %08d.jpg will output frames to 00000001.jpg, 00000002.jpg, etc.
outFirst	Override first frame number (default = 0).
outLast	Terminate application after # frames have been rendered.
bgColor	Solid background color specified as "R/G/B", from "0/0/0" (black) to "255/255/255" (white).
!bgPopup	Disable the right-click background popup menu (which includes, notably the list of active windows).
jpegQual	If exporting to JPEG, set quality factor (100% = best).
jpegDCT	If exporting to JPEG, specify DCT method ("islow", "ifast" or "float").
clampOnResize	Whenever the display is resized, clamp Agar window positions and sizes to fit the new display size.

AG_DriverSDL2FB(3), AG_DriverSDL2GL(3), AG_Driver(3), AG_DriverSw(3), AG_GL(3), AG_InitGraphics(3), AG_Intro(3)

•  Simple DirectMedia Layer
  
•  OpenGL

The sdlgl driver first appeared in Agar 1.4.0. The "debug" option appeared in Agar 1.6.0. The clampOnResize and joy options appeared in Agar 1.7.0.