class StereoCam(object):
"""For creating an apparatus with two sprites to hold left and right
eye views.
This Class is used to hold the 3D Camera which should be used to draw
the 3D objects. It also holds a 2D Camera for drawing the Sprites"""
def __init__(self, shader="uv_flat", mipmap=False, separation=0.4, interlace=0):
""" calls Texture.__init__ but doesn't need to set file name as
texture generated from the framebuffer. Keyword Arguments:
*shader*
to use when drawing sprite, defaults to post_base, a simple
3x3 convolution that does basic edge detection. Can be copied to
project directory and modified as required.
*mipmap*
can be set to True with slight cost to speed, or use fxaa shader
*separation*
distance between the two camera positions - how wide apart the
eye views are.
*interlace*
if interlace > 0 then the images are not taken with glScissor and
must be drawn with a special interlacing shader.
"""
# load shader
if interlace <= 0:
self.shader = Shader(shader)
else:
self.shader = Shader(
vshader_source="""
precision mediump float;
attribute vec3 vertex;
attribute vec2 texcoord;
uniform mat4 modelviewmatrix[2];
varying vec2 texcoordout;
void main(void) {
texcoordout = texcoord;
gl_Position = modelviewmatrix[1] * vec4(vertex,1.0);
}
""",
fshader_source="""
precision mediump float;
uniform sampler2D tex0;
uniform sampler2D tex1;
varying vec2 texcoordout;
void main(void) {{
vec4 texc0 = texture2D(tex0, texcoordout);
vec4 texc1 = texture2D(tex1, texcoordout);
vec2 coord = vec2(gl_FragCoord);
gl_FragColor = mix(texc0, texc1, step(0.5, fract(coord.x / {:f})));
}}
""".format(
interlace * 2.0
),
)
# self.shader = Shader("2d_flat")
self.camera_3d = Camera()
self.forMtrx = np.identity(4, dtype="float32") # initially not rotated
self.position = [0.0, 0.0, 0.0]
self.camera_2d = Camera(is_3d=False)
self.offs = separation / 2.0
self.interlace = interlace
self.textures = []
self.sprites = []
self.tex_list = []
for i in range(2):
self.textures.append(OffScreenTexture(name="stereo"))
ix, iy = self.textures[i].ix, self.textures[i].iy
# two sprites full width but moved so that they are centred on the
# left and right edges. The offset values then move the uv mapping
# so the image is on the right of the left sprite and left of the
# right sprite
self.sprites.append(Sprite(z=20.0, w=ix, h=iy, flip=True))
if interlace <= 0:
self.sprites[i].positionX(-ix / 2.0 + i * ix)
self.sprites[i].set_offset((i * 0.5 - 0.25, 0.0))
else:
self.sprites[i].set_2d_size(w=ix, h=iy)
self.textures[i].blend = True
self.textures[i].mipmap = mipmap
self.tex_list.append(self.textures[i])
opengles.glColorMask(1, 1, 1, 1)
def move_camera(self, position, rot, tilt, roll=0.0, absolute=True):
""" Arguments:
*position*
array [x,y,z]
*rot, tilt, roll*
rotations about y, x, z axis (yes it's not entirely logical for position
to be an array and orientation three values but it's too late to change!)
*absolute*
if set to False then the rotations are treated as relative to the
rotated frame of reference i.e. as if signals from VR headset 3
axis gyro.
"""
self.camera_3d.rotate(tilt, rot, roll)
self.camera_3d.position(position)
self.camera_3d.absolute = absolute
def start_capture(self, side):
""" after calling this method all object.draw()s will rendered
to this texture and not appear on the display.
*side*
Either 0 or 1 to determine stereoscopic view
"""
self.camera_3d.reset()
offs = -self.offs if side == 0 else self.offs
self.camera_3d.offset([offs, 0.0, 0.0])
# self.camera_3d.mtrx = np.dot(self.forMtrx, self.camera_3d.mtrx)
# self.camera_3d.position(self.position)
tex = self.textures[side]
tex._start()
if self.interlace <= 0:
xx = tex.ix / 4.0 # draw the middle only - half width
yy = 0
ww = tex.ix / 2.0
hh = tex.iy
opengles.glEnable(GL_SCISSOR_TEST)
opengles.glScissor(
ctypes.c_int(int(xx)), ctypes.c_int(int(yy)), ctypes.c_int(int(ww)), ctypes.c_int(int(hh))
)
def end_capture(self, side):
""" stop capturing to texture and resume normal rendering to default
"""
self.textures[side]._end()
if self.interlace <= 0:
opengles.glDisable(GL_SCISSOR_TEST)
def draw(self):
""" draw the shape using the saved texture
"""
if self.interlace <= 0:
for i in range(2):
self.sprites[i].draw(self.shader, [self.tex_list[i]], 0.0, 0.0, self.camera_2d)
else:
self.sprites[0].draw(self.shader, self.tex_list, 0.0, 0.0, self.camera_2d)
def get_direction(self):
return self.camera_3d.get_direction()
class StereoCam(object):
"""For creating an apparatus with two sprites to hold left and right
eye views.
This Class is used to hold the 3D Camera which should be used to draw
the 3D objects. It also holds a 2D Camera for drawing the Sprites"""
def __init__(self, shader="uv_flat", mipmap=False, separation=0.4, interlace=0):
""" calls Texture.__init__ but doesn't need to set file name as
texture generated from the framebuffer. Keyword Arguments:
*shader*
to use when drawing sprite, defaults to uv_flat.
*mipmap*
can be set to True with slight cost to speed, or use fxaa shader
*separation*
distance between the two camera positions - how wide apart the
eye views are.
*interlace*
if interlace > 0 then the images are not taken with glScissor and
must be drawn with a special interlacing shader.
"""
# load shader
if interlace <= 0: # i.e. default side by side behaviour
self.shader = Shader.create(shader)
else:
self.shader = Shader(vshader_source = """
precision mediump float;
attribute vec3 vertex;
attribute vec2 texcoord;
uniform mat4 modelviewmatrix[2];
varying vec2 texcoordout;
void main(void) {
texcoordout = texcoord;
gl_Position = modelviewmatrix[1] * vec4(vertex,1.0);
}
""", fshader_source = """
precision mediump float;
uniform sampler2D tex0;
uniform sampler2D tex1;
varying vec2 texcoordout;
void main(void) {{
vec4 texc0 = texture2D(tex0, texcoordout);
vec4 texc1 = texture2D(tex1, texcoordout);
vec2 coord = vec2(gl_FragCoord);
gl_FragColor = mix(texc0, texc1, step(0.5, fract(coord.x / {:f})));
}}
""".format(interlace * 2.0))
self.camera_3d = Camera() # create 3d cam first so it becomes default instance
self.forMtrx = np.identity(4, dtype='float32') # initially not rotated
self.position = [0.0, 0.0, 0.0]
self.camera_2d = Camera(is_3d=False)
self.offs = separation / 2.0
self.interlace = interlace
self.textures = []
self.sprites = []
self.tex_list = []
for i in range(2):
self.textures.append(OffScreenTexture(name="stereo"))
ix, iy = self.textures[i].ix, self.textures[i].iy
#two sprites full width but moved so that they are centred on the
#left and right edges. The offset values then move the uv mapping
#so the image is on the right of the left sprite and left of the
#right sprite
self.sprites.append(Sprite(z=20.0, w=ix, h=iy, flip=True))
if interlace <= 0:
self.sprites[i].positionX(-ix/2.0 + i*ix)
self.sprites[i].set_offset((i * 0.5 - 0.25, 0.0))
else:
self.sprites[i].set_2d_size(w=ix, h=iy)
self.textures[i].blend = True
self.textures[i].mipmap = mipmap
self.tex_list.append(self.textures[i])
opengles.glColorMask(1, 1, 1, 1)
def move_camera(self, position, rot, tilt, roll=0.0, absolute=True):
''' Arguments:
*position*
array [x,y,z]
*rot, tilt, roll*
rotations about y, x, z axis (yes it's not entirely logical for position
to be an array and orientation three values but it's too late to change!)
*absolute*
if set to False then the rotations are treated as relative to the
rotated frame of reference i.e. as if signals from VR headset 3
axis gyro.
'''
self.camera_3d.rotate(tilt, rot, roll)
self.camera_3d.position(position)
self.camera_3d.absolute = absolute
def start_capture(self, side):
""" after calling this method all object.draw()s will rendered
to this texture and not appear on the display.
*side*
Either 0 or 1 to determine stereoscopic view
"""
self.camera_3d.reset()
offs = -self.offs if side == 0 else self.offs
self.camera_3d.offset([offs, 0.0, 0.0])
#self.camera_3d.mtrx = np.dot(self.forMtrx, self.camera_3d.mtrx)
#self.camera_3d.position(self.position)
tex = self.textures[side]
tex._start()
if self.interlace <= 0:
xx = tex.ix / 4.0 # draw the middle only - half width
yy = 0
ww = tex.ix / 2.0
hh = tex.iy
opengles.glEnable(GL_SCISSOR_TEST)
opengles.glScissor(GLint(int(xx)), GLint(int(yy)),
GLsizei(int(ww)), GLsizei(int(hh)))
def end_capture(self, side):
""" stop capturing to texture and resume normal rendering to default
"""
self.textures[side]._end()
if self.interlace <= 0:
opengles.glDisable(GL_SCISSOR_TEST)
def draw(self):
""" draw the shape using the saved texture
"""
if self.interlace <= 0:
for i in range(2):
self.sprites[i].draw(self.shader, [self.tex_list[i].color], 0.0, 0.0, self.camera_2d)
else:
self.sprites[0].draw(self.shader, [t.color for t in self.tex_list], 0.0, 0.0, self.camera_2d)
def get_direction(self):
return self.camera_3d.get_direction()
