codepad

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require 'riko/math'
require 'riko/graphics/opentk/gles2'

def vec4(x, y, z, w); Riko::Vector.new(x, y, z, w); end
def vec3(x, y, z);    Riko::Vector.new(x, y, z, 0.0); end
def vec2(x, y);       Riko::Vector.new(x, y, 0.0, 0.0); end
window  = Riko::Graphics::OpenTK::GLES2::GameWindow.new(256, 256)
context = window.context
vertex_shader = context.compile_shader(:vertex, <<GLSL)
#ifdef GL_ES
precision mediump float;
#endif
attribute vec4 aVertex;
attribute vec3 aNormal;
attribute vec4 aColor;
varying vec4 vColor;

uniform mat4 uModelViewProjectionMatrix;

void main()
{
  gl_Position = uModelViewProjectionMatrix * aVertex;
  vColor = aColor;
}
GLSL
fragment_shader = context.compile_shader(:fragment, <<GLSL)
#ifdef GL_ES
precision mediump float;
#endif
varying vec4 vColor;
void main()
{
  gl_FragColor = vColor;
}
GLSL
program = context.create_program
program.attach(vertex_shader)
program.attach(fragment_shader)
program.bind_attrib_location(0, 'aVertex')
program.bind_attrib_location(1, 'aNormal')
program.bind_attrib_location(2, 'aColor')
program.link

vertex_array = context.create_vertex_array
vertex_buffer = context.create_buffer([
  [ #position
    #front
    [ 1.0, 1.0, 1.0, 1.0],
    [-1.0, 1.0, 1.0, 1.0],
    [-1.0,-1.0, 1.0, 1.0],
    [ 1.0, 1.0, 1.0, 1.0],
    [-1.0,-1.0, 1.0, 1.0],
    [ 1.0,-1.0, 1.0, 1.0],
    #back
    [-1.0, 1.0,-1.0, 1.0],
    [ 1.0, 1.0,-1.0, 1.0],
    [ 1.0,-1.0,-1.0, 1.0],
    [-1.0, 1.0,-1.0, 1.0],
    [ 1.0,-1.0,-1.0, 1.0],
    [-1.0,-1.0,-1.0, 1.0],
    #left
    [-1.0, 1.0, 1.0, 1.0],
    [-1.0, 1.0,-1.0, 1.0],
    [-1.0,-1.0,-1.0, 1.0],
    [-1.0, 1.0, 1.0, 1.0],
    [-1.0,-1.0,-1.0, 1.0],
    [-1.0,-1.0, 1.0, 1.0],
    #right
    [ 1.0, 1.0,-1.0, 1.0],
    [ 1.0, 1.0, 1.0, 1.0],
    [ 1.0,-1.0, 1.0, 1.0],
    [ 1.0, 1.0,-1.0, 1.0],
    [ 1.0,-1.0, 1.0, 1.0],
    [ 1.0,-1.0,-1.0, 1.0],
    #top
    [ 1.0, 1.0,-1.0, 1.0],
    [-1.0, 1.0,-1.0, 1.0],
    [-1.0, 1.0, 1.0, 1.0],
    [ 1.0, 1.0,-1.0, 1.0],
    [-1.0, 1.0, 1.0, 1.0],
    [ 1.0, 1.0, 1.0, 1.0],
    #bottom
    [ 1.0,-1.0, 1.0, 1.0],
    [-1.0,-1.0, 1.0, 1.0],
    [-1.0,-1.0,-1.0, 1.0],
    [ 1.0,-1.0, 1.0, 1.0],
    [-1.0,-1.0,-1.0, 1.0],
    [ 1.0,-1.0,-1.0, 1.0],
  ],
  [ #normal
    #front
    [ 0.0, 0.0,-1.0, 0.0],
    [ 0.0, 0.0,-1.0, 0.0],
    [ 0.0, 0.0,-1.0, 0.0],
    [ 0.0, 0.0,-1.0, 0.0],
    [ 0.0, 0.0,-1.0, 0.0],
    [ 0.0, 0.0,-1.0, 0.0],
    #back
    [ 0.0, 0.0, 1.0, 0.0],
    [ 0.0, 0.0, 1.0, 0.0],
    [ 0.0, 0.0, 1.0, 0.0],
    [ 0.0, 0.0, 1.0, 0.0],
    [ 0.0, 0.0, 1.0, 0.0],
    [ 0.0, 0.0, 1.0, 0.0],
    #left
    [-1.0, 0.0, 0.0, 0.0],
    [-1.0, 0.0, 0.0, 0.0],
    [-1.0, 0.0, 0.0, 0.0],
    [-1.0, 0.0, 0.0, 0.0],
    [-1.0, 0.0, 0.0, 0.0],
    [-1.0, 0.0, 0.0, 0.0],
    #right
    [ 1.0, 0.0, 0.0, 0.0],
    [ 1.0, 0.0, 0.0, 0.0],
    [ 1.0, 0.0, 0.0, 0.0],
    [ 1.0, 0.0, 0.0, 0.0],
    [ 1.0, 0.0, 0.0, 0.0],
    [ 1.0, 0.0, 0.0, 0.0],
    #top
    [ 0.0, 1.0, 0.0, 0.0],
    [ 0.0, 1.0, 0.0, 0.0],
    [ 0.0, 1.0, 0.0, 0.0],
    [ 0.0, 1.0, 0.0, 0.0],
    [ 0.0, 1.0, 0.0, 0.0],
    [ 0.0, 1.0, 0.0, 0.0],
    #bottom
    [ 0.0,-1.0, 0.0, 0.0],
    [ 0.0,-1.0, 0.0, 0.0],
    [ 0.0,-1.0, 0.0, 0.0],
    [ 0.0,-1.0, 0.0, 0.0],
    [ 0.0,-1.0, 0.0, 0.0],
    [ 0.0,-1.0, 0.0, 0.0],
  ],
  [ #color
    #front
    [ 1.0, 1.0, 0.0, 0.0],
    [ 1.0, 1.0, 0.0, 0.0],
    [ 1.0, 1.0, 0.0, 0.0],
    [ 1.0, 1.0, 0.0, 0.0],
    [ 1.0, 1.0, 0.0, 0.0],
    [ 1.0, 1.0, 0.0, 0.0],
    #back
    [ 0.0, 0.0, 1.0, 0.0],
    [ 0.0, 0.0, 1.0, 0.0],
    [ 0.0, 0.0, 1.0, 0.0],
    [ 0.0, 0.0, 1.0, 0.0],
    [ 0.0, 0.0, 1.0, 0.0],
    [ 0.0, 0.0, 1.0, 0.0],
    #left
    [ 0.0, 1.0, 1.0, 0.0],
    [ 0.0, 1.0, 1.0, 0.0],
    [ 0.0, 1.0, 1.0, 0.0],
    [ 0.0, 1.0, 1.0, 0.0],
    [ 0.0, 1.0, 1.0, 0.0],
    [ 0.0, 1.0, 1.0, 0.0],
    #right
    [ 1.0, 0.0, 0.0, 0.0],
    [ 1.0, 0.0, 0.0, 0.0],
    [ 1.0, 0.0, 0.0, 0.0],
    [ 1.0, 0.0, 0.0, 0.0],
    [ 1.0, 0.0, 0.0, 0.0],
    [ 1.0, 0.0, 0.0, 0.0],
    #top
    [ 0.0, 1.0, 0.0, 0.0],
    [ 0.0, 1.0, 0.0, 0.0],
    [ 0.0, 1.0, 0.0, 0.0],
    [ 0.0, 1.0, 0.0, 0.0],
    [ 0.0, 1.0, 0.0, 0.0],
    [ 0.0, 1.0, 0.0, 0.0],
    #bottom
    [ 1.0, 0.0, 1.0, 0.0],
    [ 1.0, 0.0, 1.0, 0.0],
    [ 1.0, 0.0, 1.0, 0.0],
    [ 1.0, 0.0, 1.0, 0.0],
    [ 1.0, 0.0, 1.0, 0.0],
    [ 1.0, 0.0, 1.0, 0.0],
  ],
].flatten.pack('f*'), :static_draw)
vertex_array.vertex_attrib(0, 4, :float, false, 16, 0*36*16, vertex_buffer)
vertex_array.vertex_attrib(1, 3, :float, false, 16, 1*36*16, vertex_buffer)
vertex_array.vertex_attrib(2, 4, :float, false, 16, 2*36*16, vertex_buffer)

context.set_front_face(:ccw)
context.set_cull_face(:back)
context.set_depth_func(:less)
context.set_clear_color(0.2, 0.2, 0.2, 0.0)

model_transform = Riko::Matrix.identity
vp_matrix =
  Riko::Matrix.perspective(45, 1.0, 0.1, 100.0) *
  Riko::Matrix.look_at(
    vec3( 0.0, 0.0, 0.0),
    vec3( 2.0, 2.0, 2.0),
    vec3( 0.0, 1.0, 0.0))

t = Time.now
window.run do |step|
  context.clear
  Riko::Matrix.mul_rotate(model_transform, step*Math::PI/180.0, 0.0, 1.0, 0.0)
  mvp_matrix = vp_matrix * model_transform
  program.uniform_matrix4(program.uniform_location('uModelViewProjectionMatrix'), 1, mvp_matrix.transpose.to_a)
  context.draw_arrays(program, :triangles, vertex_array, 0, 36)
  window.swap_buffers
  window.close if Time.now-t>6
end

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