58 lines
1.2 KiB
Elm
58 lines
1.2 KiB
Elm
import Math.Vector3 (..)
|
|
import Math.Matrix4 (..)
|
|
import Graphics.WebGL (..)
|
|
|
|
-- Create a mesh with two triangles
|
|
|
|
type Vertex = { position:Vec3, color:Vec3 }
|
|
|
|
mesh : [Triangle Vertex]
|
|
mesh = [ ( Vertex (vec3 0 0 0) (vec3 1 0 0)
|
|
, Vertex (vec3 1 1 0) (vec3 0 1 0)
|
|
, Vertex (vec3 1 -1 0) (vec3 0 0 1)
|
|
)
|
|
]
|
|
|
|
-- Create the scene
|
|
|
|
main : Signal Element
|
|
main = scene <~ foldp (+) 0 (fps 30)
|
|
|
|
scene : Float -> Element
|
|
scene t =
|
|
webgl (400,400)
|
|
[ entity vertexShader fragmentShader mesh { view = view (t / 1000) } ]
|
|
|
|
view : Float -> Mat4
|
|
view t =
|
|
mul (makePerspective 45 1 0.01 100)
|
|
(makeLookAt (vec3 (4 * cos t) 0 (4 * sin t)) (vec3 0 0 0) (vec3 0 1 0))
|
|
|
|
-- Shaders
|
|
|
|
vertexShader : Shader { attr | position:Vec3, color:Vec3 } { unif | view:Mat4 } { vcolor:Vec3 }
|
|
vertexShader = [glsl|
|
|
|
|
attribute vec3 position;
|
|
attribute vec3 color;
|
|
uniform mat4 view;
|
|
varying vec3 vcolor;
|
|
|
|
void main () {
|
|
gl_Position = view * vec4(position, 1.0);
|
|
vcolor = color;
|
|
}
|
|
|
|
|]
|
|
|
|
fragmentShader : Shader {} u { vcolor:Vec3 }
|
|
fragmentShader = [glsl|
|
|
|
|
precision mediump float;
|
|
varying vec3 vcolor;
|
|
|
|
void main () {
|
|
gl_FragColor = vec4(vcolor, 1.0);
|
|
}
|
|
|
|
|]
|