class SkyBox(RendererObjectManager):
'''
Provides the background that goes behind everything
'''
NUM_VERTEX_BANDS = 8
# This number MUST be even
NUM_STEPS_IN_BAND = 10
# Used to make sure rounding error doesn't make us have off-by-one errors in our iterations.
EPSILON = 1e-3
def reload(self, gl, full_reload):
self.vertex_buffer.reload()
self.color_buffer.reload()
self.index_buffer.reload()
def set_sun_position(self, new_pos):
self.sun_pos = new_pos.copy()
def draw_internal(self, gl):
if self.render_state.night_vision_mode:
return
gl.glEnableClientState(gl.GL_VERTEX_ARRAY)
gl.glEnableClientState(gl.GL_COLOR_ARRAY)
gl.glDisableClientState(gl.GL_TEXTURE_COORD_ARRAY)
gl.glEnable(gl.GL_CULL_FACE)
gl.glFrontFace(gl.GL_CW)
gl.glCullFace(gl.GL_BACK)
gl.glShadeModel(gl.GL_SMOOTH)
gl.glPushMatrix()
# Rotate the sky box to the position of the sun.
cp = cross_product(Vector3(0, 1, 0), self.sun_pos)
cp = normalized(cp)
angle = 180.0 / math.pi * math.acos(self.sun_pos.y)
gl.glRotatef(angle, cp.x, cp.y, cp.z)
self.vertex_buffer.set(gl)
self.color_buffer.set(gl)
self.index_buffer.draw(gl, gl.GL_TRIANGLES)
gl.glPopMatrix()
def __init__(self, layer_id, texture_manager):
'''
Constructor
'''
RendererObjectManager.__init__(self, layer_id, texture_manager)
self.vertex_buffer = VertexBuffer(0, True)
self.color_buffer = ColorBuffer(0, True)
self.index_buffer = IndexBuffer(0, True)
self.sun_pos = GeocentricCoordinates(0, 1, 0)
num_vertices = self.NUM_VERTEX_BANDS * self.NUM_STEPS_IN_BAND
num_indices = (self.NUM_VERTEX_BANDS-1) * self.NUM_STEPS_IN_BAND * 6
self.vertex_buffer.reset(num_vertices)
self.color_buffer.reset(num_vertices)
self.index_buffer.reset(num_indices)
sin_angles = [0.0] * self.NUM_STEPS_IN_BAND
cos_angles = [0.0] * self.NUM_STEPS_IN_BAND
angle_in_band = 0
d_angle = 2* math.pi / float(self.NUM_STEPS_IN_BAND - 1)
for i in range(0, self.NUM_STEPS_IN_BAND):
sin_angles[i] = math.sin(angle_in_band)
cos_angles[i] = math.cos(angle_in_band)
angle_in_band += d_angle
band_step = 2.0 / float((self.NUM_VERTEX_BANDS-1) + self.EPSILON)
vb = self.vertex_buffer
cb = self.color_buffer
band_pos = 1
for band in range(0, self.NUM_VERTEX_BANDS):
a, r, g, b = 0, 0, 0, 0
if band_pos > 0:
intensity = long(band_pos * 20 + 50) & 0xFFFFFFFF
a = 0xFF
r = (intensity << 16) & 0x00FF0000
g = (intensity << 16) & 0x0000FF00
b = (intensity << 16) & 0x000000FF
else:
intensity = long(band_pos * 40 + 40) & 0xFFFFFFFF
color = (intensity << 16) | (intensity << 8) | (intensity)
a = 0xFF
r = color & 0x00FF0000
g = color & 0x0000FF00
b = color & 0x000000FF
band_pos -= band_step
sin_phi = math.sqrt(1 - band_pos*band_pos) if band_pos > -1 else 0
for i in range(0, self.NUM_STEPS_IN_BAND):
vb.add_point(Vector3(cos_angles[i] * sin_phi, band_pos, sin_angles[i] * sin_phi))
cb.add_color(a, r, g, b)
ib = self.index_buffer
# Set the indices for the first band.
top_band_start = 0
bottom_band_start = self.NUM_STEPS_IN_BAND
for triangle_band in range(0, self.NUM_VERTEX_BANDS-1):
for offset_from_start in range(0, self.NUM_STEPS_IN_BAND-1):
# Draw one quad as two triangles.
top_left = (top_band_start + offset_from_start)
top_right = (top_left + 1)
bottom_left = (bottom_band_start + offset_from_start)
bottom_right = (bottom_left + 1)
# First triangle
ib.add_index(top_left)
ib.add_index(bottom_right)
ib.add_index(bottom_left)
# Second triangle
ib.add_index(top_right)
ib.add_index(bottom_right)
ib.add_index(top_left)
# Last quad: connect the end with the beginning.
# Top left, bottom right, bottom left
ib.add_index((top_band_start + self.NUM_STEPS_IN_BAND - 1))
ib.add_index(bottom_band_start)
ib.add_index((bottom_band_start + self.NUM_STEPS_IN_BAND - 1))
# Top right, bottom right, top left
ib.add_index(top_band_start)
ib.add_index(bottom_band_start)
ib.add_index((top_band_start + self.NUM_STEPS_IN_BAND - 1))
top_band_start += self.NUM_STEPS_IN_BAND
bottom_band_start += self.NUM_STEPS_IN_BAND
class SkyBox(RendererObjectManager):
'''
Provides the background that goes behind everything
'''
NUM_VERTEX_BANDS = 8
# This number MUST be even
NUM_STEPS_IN_BAND = 10
# Used to make sure rounding error doesn't make us have off-by-one errors in our iterations.
EPSILON = 1e-3
def reload(self, gl, full_reload):
self.vertex_buffer.reload()
self.color_buffer.reload()
self.index_buffer.reload()
def set_sun_position(self, new_pos):
self.sun_pos = new_pos.copy()
def draw_internal(self, gl):
if self.render_state.night_vision_mode:
return
gl.glEnableClientState(gl.GL_VERTEX_ARRAY)
gl.glEnableClientState(gl.GL_COLOR_ARRAY)
gl.glDisableClientState(gl.GL_TEXTURE_COORD_ARRAY)
gl.glEnable(gl.GL_CULL_FACE)
gl.glFrontFace(gl.GL_CW)
gl.glCullFace(gl.GL_BACK)
gl.glShadeModel(gl.GL_SMOOTH)
gl.glPushMatrix()
# Rotate the sky box to the position of the sun.
cp = cross_product(Vector3(0, 1, 0), self.sun_pos)
cp = normalized(cp)
angle = 180.0 / math.pi * math.acos(self.sun_pos.y)
gl.glRotatef(angle, cp.x, cp.y, cp.z)
self.vertex_buffer.set(gl)
self.color_buffer.set(gl)
self.index_buffer.draw(gl, gl.GL_TRIANGLES)
gl.glPopMatrix()
def __init__(self, layer_id, texture_manager):
'''
Constructor
'''
RendererObjectManager.__init__(self, layer_id, texture_manager)
self.vertex_buffer = VertexBuffer(0, True)
self.color_buffer = ColorBuffer(0, True)
self.index_buffer = IndexBuffer(0, True)
self.sun_pos = GeocentricCoordinates(0, 1, 0)
num_vertices = self.NUM_VERTEX_BANDS * self.NUM_STEPS_IN_BAND
num_indices = (self.NUM_VERTEX_BANDS - 1) * self.NUM_STEPS_IN_BAND * 6
self.vertex_buffer.reset(num_vertices)
self.color_buffer.reset(num_vertices)
self.index_buffer.reset(num_indices)
sin_angles = [0.0] * self.NUM_STEPS_IN_BAND
cos_angles = [0.0] * self.NUM_STEPS_IN_BAND
angle_in_band = 0
d_angle = 2 * math.pi / float(self.NUM_STEPS_IN_BAND - 1)
for i in range(0, self.NUM_STEPS_IN_BAND):
sin_angles[i] = math.sin(angle_in_band)
cos_angles[i] = math.cos(angle_in_band)
angle_in_band += d_angle
band_step = 2.0 / float((self.NUM_VERTEX_BANDS - 1) + self.EPSILON)
vb = self.vertex_buffer
cb = self.color_buffer
band_pos = 1
for band in range(0, self.NUM_VERTEX_BANDS):
a, r, g, b = 0, 0, 0, 0
if band_pos > 0:
intensity = long(band_pos * 20 + 50) & 0xFFFFFFFF
a = 0xFF
r = (intensity << 16) & 0x00FF0000
g = (intensity << 16) & 0x0000FF00
b = (intensity << 16) & 0x000000FF
else:
intensity = long(band_pos * 40 + 40) & 0xFFFFFFFF
color = (intensity << 16) | (intensity << 8) | (intensity)
a = 0xFF
r = color & 0x00FF0000
g = color & 0x0000FF00
b = color & 0x000000FF
band_pos -= band_step
sin_phi = math.sqrt(1 -
band_pos * band_pos) if band_pos > -1 else 0
for i in range(0, self.NUM_STEPS_IN_BAND):
vb.add_point(
Vector3(cos_angles[i] * sin_phi, band_pos,
sin_angles[i] * sin_phi))
cb.add_color(a, r, g, b)
ib = self.index_buffer
# Set the indices for the first band.
top_band_start = 0
bottom_band_start = self.NUM_STEPS_IN_BAND
for triangle_band in range(0, self.NUM_VERTEX_BANDS - 1):
for offset_from_start in range(0, self.NUM_STEPS_IN_BAND - 1):
# Draw one quad as two triangles.
top_left = (top_band_start + offset_from_start)
top_right = (top_left + 1)
bottom_left = (bottom_band_start + offset_from_start)
bottom_right = (bottom_left + 1)
# First triangle
ib.add_index(top_left)
ib.add_index(bottom_right)
ib.add_index(bottom_left)
# Second triangle
ib.add_index(top_right)
ib.add_index(bottom_right)
ib.add_index(top_left)
# Last quad: connect the end with the beginning.
# Top left, bottom right, bottom left
ib.add_index((top_band_start + self.NUM_STEPS_IN_BAND - 1))
ib.add_index(bottom_band_start)
ib.add_index((bottom_band_start + self.NUM_STEPS_IN_BAND - 1))
# Top right, bottom right, top left
ib.add_index(top_band_start)
ib.add_index(bottom_band_start)
ib.add_index((top_band_start + self.NUM_STEPS_IN_BAND - 1))
top_band_start += self.NUM_STEPS_IN_BAND
bottom_band_start += self.NUM_STEPS_IN_BAND
