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|
;;;; bitmap.lisp
(in-package #:wheelwork)
(defclass/std bitmap (affine interactive)
((texture :ri :std (error "A bitmap requires a texture."))
(vao shader :with :r :static)))
(defmethod initialize-instance :after ((bitmap bitmap) &key)
(with-slots (vao shader base-width base-height texture) bitmap
(setf base-height (texture-height texture)
base-width (texture-width texture))
(unless shader
(setf shader
(create-shader
'(:vertex
((vert :vec2))
((transform :mat4))
((values
(* transform (vari:vec4 vert 0.0 1.0))
vert))) ;color
'(:fragment
((tc :vec2))
((tex :sampler-2d))
((let ((frag (vari:texture tex tc)))
(if (< (aref frag 3) 0.01)
(vari:discard)
frag))))))
(gl:program-uniformi
shader
(gl:get-uniform-location shader "TEX")
0))
(unless vao
(setf vao (gl:gen-vertex-array))
(gl:bind-vertex-array vao)
(let ((vbo (gl:gen-buffer)))
(with-gl-array (verts :float
0.0 1.0
1.0 0.0
0.0 0.0
0.0 1.0
1.0 1.0
1.0 0.0 )
(gl:bind-buffer :array-buffer vbo)
(gl:buffer-data :array-buffer :static-draw verts)))
(gl:enable-vertex-attrib-array 0)
(gl:vertex-attrib-pointer 0 2 :float 0 (* +float-size+ 2) 0)
(gl:bind-buffer :array-buffer 0)
(gl:bind-vertex-array 0))))
(defmethod cleanup ((bitmap bitmap))
(with-slots (vao shader) bitmap
(when vao
(gl:delete-vertex-arrays (list vao)))
(when shader
(gl:delete-program shader))
(setf vao nil
shader nil)))
(defmethod render ((bitmap bitmap))
(with-slots (texture vao shader) bitmap
(gl:active-texture 0)
(gl:bind-texture :texture-2d (texture-id texture))
(gl:use-program shader)
(gl:program-uniform-matrix-4fv
shader
(gl:get-uniform-location shader "TRANSFORM")
(projected-matrix bitmap))
(gl:bind-vertex-array vao)
(gl:draw-arrays :triangles 0 6)
(gl:bind-vertex-array 0)))
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