examples/shader.lisp

   1 (require '#:asdf)
   2 (asdf:oos 'asdf:load-op '#:cl-glfw)
   3 (asdf:oos 'asdf:load-op '#:cl-glfw-opengl)
   4 (asdf:oos 'asdf:load-op '#:cl-glfw-glu)
   5 (asdf:oos 'asdf:load-op '#:cl-glfw-opengl-version_2_0)
   6
   7 (defparameter *shader-program* nil)
   8 (defparameter *uniform-time* nil)
   9
  10 (glfw:do-window ("An OpenGL 2.0 Shader Example")
  11     ((gl:with-setup-projection
  12        (glu:perspective 45 4/3 0.1 50))
  13      (setf *shader-program*
  14            (gl:make-program
  15             (gl:make-shader gl:+vertex-shader+ "
  16 varying vec3 colour;
  17 void main()
  18 {
  19   colour = gl_Color.rgb;
  20   gl_Position = ftransform();
  21 }
  22 ")
  23             (gl:make-shader gl:+fragment-shader+ "
  24 uniform float time;
  25 varying vec3 colour;
  26 const float pi2=2.0*3.14159265;
  27 void main()
  28 {
  29   gl_FragColor = vec4(pow(sin(colour.r*pi2*4.0+mod(time*8.0,pi2)),2.0),
  30                       pow(sin(colour.g*pi2*4.0+mod(time*8.0,pi2)),2.0),
  31                       pow(sin(colour.b*pi2*4.0+mod(time*8.0,pi2)),2.0),
  32                       1.0);
  33 }
  34 ")))
  35      (gl:use-program *shader-program*)
  36      (setf *uniform-time* (gl:get-uniform-location *shader-program* "time")))
  37   (gl:clear gl:+color-buffer-bit+)
  38   (gl:load-identity)
  39   (gl:translate-f 0 0 -5)
  40   (gl:rotate-d (* 10 (glfw:get-time)) 1 1 0)
  41   (gl:rotate-d (* 90 (glfw:get-time)) 0 0 1)
  42   (gl:uniform-1f *uniform-time* (coerce (glfw:get-time) 'single-float))
  43   (gl:with-begin gl:+triangles+
  44     (gl:color-3f 1 0 0) (gl:vertex-3f  1  0 0)
  45     (gl:color-3f 0 1 0) (gl:vertex-3f -1  1 0)
  46     (gl:color-3f 0 0 1) (gl:vertex-3f -1 -1 0)))