.\" Copyright (c) 2010-2022 Julien Nadeau Carriere <vedge@csoft.net>
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.Dd December 23, 2022
.Dt AG_DRIVERSDLGL 3
.Os Agar 1.7
.Sh NAME
.Nm AG_DriverSDLGL
.Nd agar SDL1 OpenGL driver
.Sh DESCRIPTION
.\" IMAGE(/widgets/AG_DriverSDLGL.png, "The sdlgl driver")
The Agar
.Va 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.
.Pp
Using
.Xr AG_InitVideoSDL 3
as opposed to
.Xr AG_InitGraphics 3 ,
it is possible to attach Agar to an existing SDL display surface.
If the SDL surface has the
.Dv SDL_OPENGL
flag set, Agar selects the
.Va sdlgl
driver automatically.
.Sh INHERITANCE HIERARCHY
.Xr AG_Driver 3 ->
.Xr AG_DriverSw 3 ->
.Nm .
.Sh EXAMPLES
.Bd -literal -offset indent
.\" SYNTAX(c)
AG_InitGraphics("sdlgl(width=640:height=480:joy)");
AG_InitGraphics("sdlgl(width=60%:height=80%)");
AG_InitGraphics("sdlgl(bgColor=0/120/120)");
AG_InitGraphics("sdlgl(out=%08d.jpg:outFirst=10)");
AG_InitGraphics("sdlgl(depth=64:stereo)");

AG_InitVideoSDL(an_existing_SDL_screen, 0);
.Ed
.Sh OPTIONS
.Bl -tag -compact -width "clampOnResize"
.It debug
Capture
.Dv GL_DEBUG_OUTPUT
errors.
.It joy
Enable joystick input device support.
.It stereo
Request a stereoscopic visual.
.It width
Width (in pixels, in % of total desktop or "auto").
.It height
Height (in pixels, in % of total desktop or "auto").
.It depth
Depth (in bits per pixel or "auto").
.It fpsMax
Limit refresh rate in frames/second (e.g., "60").
.It 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,
.Sq %08d.jpg
will output frames to 00000001.jpg, 00000002.jpg, etc.
.It outFirst
Override first frame number (default = 0).
.It outLast
Terminate application after # frames have been rendered.
.It bgColor
Solid background color specified as "R/G/B", from "0/0/0" (black) to
"255/255/255" (white).
.It !bgPopup
Disable the right-click background popup menu
(which includes, notably the list of active windows).
.It jpegQual
If exporting to JPEG, set quality factor (100% = best).
.It jpegDCT
If exporting to JPEG, specify DCT method ("islow", "ifast" or "float").
.It clampOnResize
Whenever the display is resized, clamp Agar window positions and sizes
to fit the new display size.
.El
.Sh SEE ALSO
.Xr AG_DriverSDL2FB 3 ,
.Xr AG_DriverSDL2GL 3 ,
.Xr AG_Driver 3 ,
.Xr AG_DriverSw 3 ,
.Xr AG_GL 3 ,
.Xr AG_InitGraphics 3 ,
.Xr AG_Intro 3
.Pp
.Bl -tag -compact
.It Lk https://libsdl.org/ Simple DirectMedia Layer
.It Lk https://www.opengl.org/ OpenGL
.El
.Sh HISTORY
The
.Va sdlgl
driver first appeared in Agar 1.4.0.
The "debug" option appeared in Agar 1.6.0.
The
.Va clampOnResize
and
.Va joy
options appeared in Agar 1.7.0.