def draw_object():
glVertexAttribPointer(locations[b"vertex"], 3, GL_FLOAT, False, record_len,
vertex_offset)
glVertexAttribPointer(locations[b"tex_coord"], 3, GL_FLOAT, False,
record_len, tex_coord_offset)
glVertexAttribPointer(locations[b"normal"], 3, GL_FLOAT, False, record_len,
normal_offset)
glVertexAttribPointer(locations[b"color"], 3, GL_FLOAT, False, record_len,
color_offset)
modelview = m.identity()
modelview = m.mul(modelview, m.scale(scale, scale, scale))
modelview = m.mul(modelview, q.matrix(rotation))
glUniformMatrix4fv(locations[b"modelview_matrix"], 1, GL_FALSE,
c_matrix(modelview))
normal = m.transpose(m.inverse(m.top_left(modelview)))
glUniformMatrix3fv(locations[b"normal_matrix"], 1, GL_FALSE,
c_matrix(normal))
offset = 0
for size in sizes:
glDrawElements(GL_TRIANGLE_STRIP, size, GL_UNSIGNED_INT,
c_void_p(offset))
offset += size * uint_size
def animate_texture(fps=25, period=10):
f, _ = modf(time() / period)
texture = m.identity()
texture = m.mul(texture, m.translate(f, f, f))
texture = m.mul(texture, m.rotate(f * 360, 1, 1, 1))
f = abs(f * 2 - 1)
texture = m.mul(texture, m.scale(1 + f, 1 + f, 1 + f))
glUniformMatrix4fv(locations[b"texture_matrix"], 1, GL_FALSE,
c_matrix(texture))
glutPostRedisplay()
if texturing:
glutTimerFunc(int(1000 / fps), animate_texture, fps)
def reshape(width, height):
"""window reshape callback."""
glViewport(0, 0, width, height)
projection = m.identity()
radius = .5 * min(width, height)
w, h = width / radius, height / radius
if perspective:
projection = m.mul(projection, m.frustum(-w, w, -h, h, 8, 16))
projection = m.mul(projection, m.translate(tz=-12))
projection = m.mul(projection, m.scale(1.5, 1.5, 1.5))
else:
projection = m.mul(projection, m.ortho(-w, w, -h, h, -2, 2))
glUniformMatrix4fv(locations[b"projection_matrix"], 1, GL_FALSE,
c_matrix(projection))
def rotationIPV(_, view):
''' Inverse Projection Matrix
in usage for a skybox cam
since glFrustum isn't called here,
compute PV from an other given mat,
discard translation and inverse
'''
PV = _m.mul(_m.transpose(_.projmat), view)
# PV[0][3]=PV[1][3]=PV[2][3]=0
#PV[3] = [0,0,0,1]
_.matrix = _m.inverse(PV)
def compute(_):
''' OPTIMIZATION: factorize directly all computations in here'''
#_.camera = _m.mul(_.camera, _m.translate(dx/100,dy/100,0))
_.matrix = _m.mul(_m.translate(*_.position), _q.matrix(_.rotation))
