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cube.py
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cube.py
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# System imports
from OpenGL.GL import *
from OpenGL.arrays import vbo
import numpy
# Vroom imports
from vroom.core.transform import scale
from batch_mode import EnableBatchMode
class Cube:
vertices = [
[0.0, 0.0, 0.0],
[1.0, 0.0, 0.0],
[1.0, 1.0, 0.0],
[0.0, 1.0, 0.0],
[0.0, 0.0, 1.0],
[1.0, 0.0, 1.0],
[1.0, 1.0, 1.0],
[0.0, 1.0, 1.0]
]
normals = [
[ 1.0, 0.0, 0.0],
[-1.0, 0.0, 0.0],
[ 0.0, 1.0, 0.0],
[ 0.0, -1.0, 0.0],
[ 0.0, 0.0, 1.0],
[ 0.0, 0.0, -1.0]
]
texcoords = [
[0.0, 0.0],
[1.0, 0.0],
[1.0, 1.0],
[0.0, 1.0]
]
vertex_indices = [
0, 1, 5, 4, # front
1, 2, 6, 5, # right
2, 3, 7, 6, # back
3, 0, 4, 7, # left
4, 5, 6, 7, # top
1, 0, 3, 2 # bottom
]
normal_indices = [
3, 3, 3, 3,
0, 0, 0, 0,
2, 2, 2, 2,
1, 1, 1, 1,
4, 4, 4, 4,
5, 5, 5, 5
]
texcoord_indices = [
0, 1, 2, 3,
0, 1, 2, 3,
0, 1, 2, 3,
0, 1, 2, 3,
0, 1, 2, 3,
0, 1, 2, 3
]
def __init__(self):
def generate_data(data, indices):
output = []
for i in indices:
output.extend(data[i])
return output
create_vbo = lambda x: vbo.VBO(data=numpy.array(x, dtype=numpy.float32), usage=GL_STATIC_DRAW, target=GL_ARRAY_BUFFER)
create_ibo = lambda x: vbo.VBO(data=numpy.array(x, dtype=numpy.short), usage=GL_STATIC_DRAW, target=GL_ELEMENT_ARRAY_BUFFER)
vertex_data = generate_data(Cube.vertices, Cube.vertex_indices)
normal_data = generate_data(Cube.normals, Cube.normal_indices)
texture_data = generate_data(Cube.texcoords, Cube.texcoord_indices)
self.vertex_buffer = create_vbo(vertex_data)
self.normal_buffer = create_vbo(normal_data)
self.texture_buffer = create_vbo(texture_data)
def _pre_render(self):
glPushClientAttrib(GL_CLIENT_VERTEX_ARRAY_BIT)
glEnableClientState(GL_VERTEX_ARRAY)
glEnableClientState(GL_NORMAL_ARRAY)
glEnableClientState(GL_TEXTURE_COORD_ARRAY)
self.normal_buffer.bind()
glNormalPointer(GL_FLOAT, 0, None)
self.texture_buffer.bind()
glTexCoordPointer(2, GL_FLOAT, 0, None)
self.vertex_buffer.bind()
glVertexPointer(3, GL_FLOAT, 0, None)
def _post_render(self):
self.normal_buffer.unbind()
self.texture_buffer.unbind()
self.vertex_buffer.unbind()
glPopClientAttrib()
def render_function(f):
def wrapper(self):
self._pre_render()
f(self)
self._post_render()
return wrapper
@render_function
def draw_sides(self):
glDrawArrays(GL_QUADS, 0, 16)
@render_function
def draw_top(self):
glDrawArrays(GL_QUADS, 16, 4)
@render_function
def draw_bottom(self):
glDrawArrays(GL_QUADS, 20, 24)
@render_function
def draw(self):
glDrawArrays(GL_QUADS, 0, len(self.vertex_buffer)/3)
_Cube = Cube()
@EnableBatchMode
def cube(*args, **kwargs):
glPushMatrix()
scale(*args)
style = kwargs.get('style', 'wireframe')
texture = kwargs.get('texture', None)
if texture:
style = 'solid'
if style == 'wireframe':
glPolygonMode(GL_FRONT_AND_BACK, GL_LINE)
glDisable(GL_CULL_FACE)
_Cube.draw()
glPolygonMode(GL_FRONT_AND_BACK, GL_FILL)
glEnable(GL_CULL_FACE)
elif style == 'solid':
if type(texture) == dict:
texture['top'].bind()
_Cube.draw_top()
texture['bottom'].bind()
_Cube.draw_bottom()
texture['sides'].bind()
_Cube.draw_sides()
else:
if texture:
texture.bind()
_Cube.draw()
if texture:
texture.unbind()
else:
raise Exception('vroom.cube: invalid style value')
glPopMatrix()