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(defun make-shader ()
(wheelwork::create-shader
'(:vertex
((vert :vec2) (col :vec2))
()
(
(let ((extent (vari:vec4 1.0)))
(values
(vari:vec4
(* 0.01 vert) 0.0 1.0)
col))))
'(:fragment
((tc :vec2))
((tex :sampler-2d))
((+ (vari:vec4 0.0 1.0 1.0 1.0) (vari:texture tex tc))))))
(defun start ()
(sdl2:with-init (:everything)
(sdl2:gl-set-attr :context-major-version 3)
(sdl2:gl-set-attr :context-minor-version 3)
(sdl2:gl-set-attr :context-profile-mask
sdl2-ffi:+sdl-gl-context-profile-core+)
(sdl2:gl-set-attr :doublebuffer 1)
(sdl2:with-window (window
:flags '(:shown :opengl)
:title "Font Example")
(sdl2:with-gl-context (ctx window)
(sdl2:gl-make-current window ctx)
(gl:viewport 0 0 800 800)
(gl:enable :depth-test)
(let* ((font
(cl-fond:make-font
#P"~/sites/hyperthings.garden/css/fonts/LibreCaslonDisplay-Regular.ttf"
"ABCDEFGHJIJKLMNOPQRSTUVWXYZabcdefhgjijklmnopqrstuvwxyz0123456789 ,.!?:;-+/\\"))
(shader
(make-shader)))
(gl:program-uniformi shader (gl:get-uniform-location shader "TEX") 0)
(multiple-value-bind (vao elems) (cl-fond:compute-text font "Hey Man")
(print (list :vao vao :elems elems))
(sdl2:with-event-loop (:method :poll)
(:idle ()
(gl:clear-color 0.0 0.5 0.5 1.0)
(gl:clear :depth-buffer-bit :color-buffer-bit)
(gl:use-program shader)
(gl:active-texture 0)
(gl:bind-texture :texture-2d (cl-fond:texture font))
(gl:bind-vertex-array vao)
(%gl:draw-elements :triangles
elems
:unsigned-int 0)
(gl:bind-vertex-array 0)
(sdl2:gl-swap-window window)
(setf got-here t))
(:quit ()
(gl:delete-vertex-arrays (list vao))
t))))))))
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