A few shader samples
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67
main.py
67
main.py
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@ -2,72 +2,15 @@
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import os
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import math
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from pixel import Pixel, Screen
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from pixel import Screen
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WIDTH, HEIGHT = 100, 30
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from shaders import eyeblower
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WIDTH, HEIGHT = 100, 30 # Set to -1, -1 for dynamic resolution
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STD_HANDLE = 1 # Would want this to be 0, but it can cause issues
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def shad_background(pixel: Pixel, x: int, y: int, time: float):
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uv = (x / WIDTH, y / HEIGHT)
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h = math.sin(uv[0] * math.pi + uv[1] * 10.0 + time + math.cos(uv[0] * uv[1] + uv[1] * 7.1823) * math.sin(uv[0] * 14.2))
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pixel.background_color.set(h, h, h)
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def shad_wave(pixel: Pixel, x: int, y: int, time: float): # https://www.shadertoy.com/view/Wd23W3
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uv = (x / WIDTH, y / HEIGHT)
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def hsv2rgb(h, s, v) -> tuple:
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r,g,b = 0,0,0
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i = int(h * 6)
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f = h * 6 - i
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p = v * (1 - s)
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q = v * (1 - f * s)
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t = v * (1 - (1 - f) * s)
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o = i % 6
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if o == 0:
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r,g,b = v,t,p
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elif o == 1:
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r,g,b = q,v,p
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elif o == 2:
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r,g,b = p,v,t
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elif o == 3:
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r,g,b = p,q,v
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elif o == 4:
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r,g,b = t,p,v
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else:
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r,g,b = v,p,q
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return r, g, b
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def step(edge: float, value: float) -> float:
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return 1.0 if value > edge else 0.0
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def strip(h: float, thickness: float, y: float) -> float:
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return step(y + h - thickness, step(1., y + h + thickness))
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col = [0.0, 0.0, 0.0]
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f = 0.0
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while f < math.pi * 2:
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a = strip(.5 + math.cos(uv[0] * 2. + time * 3.) * .15,
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.005,
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uv[1] + math.cos(uv[0] * 3. + time * 2. + f) * .25)
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_col = hsv2rgb(f / math.pi / 2., 1., 1.)
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for i in range(3):
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col[i] += a * _col[i]
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f += math.pi / 4.
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pixel.text_color.set(*col)
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screen = Screen(WIDTH, HEIGHT, STD_HANDLE, [
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shad_background
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#shad_wave
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eyeblower.main
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])
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screen.mainloop()
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9
pixel.py
9
pixel.py
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@ -80,6 +80,8 @@ class Screen:
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self.time_start = datetime.datetime.now()
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self.buffer = ""
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self.dynamic = self.height < 0 and self.width < 0
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def get_time(self):
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return (datetime.datetime.now() - self.time_start).total_seconds()
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@ -95,6 +97,10 @@ class Screen:
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while True:
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width, height = os.get_terminal_size(self.std_handle)
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if self.dynamic:
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self.width, self.height = width, height
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if width < self.width or height < self.height:
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Screen.clear()
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print("Unable to print the screen, a terminal with %dx%d (and above) chars are required to continue" % (self.width, self.height))
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@ -103,10 +109,11 @@ class Screen:
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time = self.get_time()
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resolution = (self.width, self.height)
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for y in range(self.height):
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for x in range(self.width):
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for render_func in self.render_funcs:
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render_func(pixel, x, y, time)
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render_func(pixel, resolution, (x, y), time)
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self.write(str(pixel))
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pixel.reset()
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self.write("\x1b[0m\n") # newline
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8
shaders/background.py
Normal file
8
shaders/background.py
Normal file
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@ -0,0 +1,8 @@
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import math
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from pixel import Pixel
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def main(pixel: Pixel, resolution: tuple, frag_coord: tuple, time: float):
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uv = (frag_coord[0] / resolution[0], frag_coord[1] / resolution[1])
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h = math.sin(uv[0] * math.pi + uv[1] * 10.0 + time + math.cos(uv[0] * uv[1] + uv[1] * 7.1823) * math.sin(uv[0] * 14.2))
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pixel.background_color.set(h, h, h)
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11
shaders/default.py
Normal file
11
shaders/default.py
Normal file
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@ -0,0 +1,11 @@
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import math
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from pixel import Pixel
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def main(pixel: Pixel, resolution: tuple, frag_coord: tuple, time: float):
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uv = (frag_coord[0] / resolution[0], frag_coord[1] / resolution[1])
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pixel.background_color.set(
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0.5 + 0.5 * math.cos(time + uv[0]),
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0.5 + 0.5 * math.cos(time + uv[1] + 2),
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0.5 + 0.5 * math.cos(time + uv[0] + 4)
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)
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40
shaders/eyeblower.py
Normal file
40
shaders/eyeblower.py
Normal file
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@ -0,0 +1,40 @@
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import math
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from pixel import Pixel
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FREQUENCY = 20.0
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COLOR_A = (1.0, 0.5, 0.9)
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COLOR_B = (0.5, 0.1, 0.3)
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def distance(a: tuple, b: tuple) -> float:
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if len(a) != len(b):
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raise TypeError("Mismatching dimentional vector passed")
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dist = 0
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for i in range(len(a)):
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d = b[i] - a[i]
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dist += d * d
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return dist ** 0.5
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def sign(v: float) -> float:
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return 1.0 if v >= 0 else 0.0
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def main(pixel: Pixel, resolution: tuple, frag_coord: tuple, time: float): # https://www.shadertoy.com/view/ldX3DN
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uv = tuple(-1.0 + 2.0 * x for x in (frag_coord[0] / resolution[0], frag_coord[1] / resolution[1]))
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homo_coords = (uv[0], 2.0 * frag_coord[1] / resolution[0])
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moving_origin1 = (math.sin(time * 0.7), math.sin(time * 1.7))
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moving_origin2 = (-math.cos(time * 2.0), -math.sin(time * 3.0))
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wave_point1 = math.sin( distance(moving_origin1, homo_coords) * FREQUENCY )
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wave_point2 = math.sin( distance(moving_origin2, homo_coords) * FREQUENCY )
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black_or_white1 = sign(wave_point1)
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black_or_white2 = sign(wave_point2)
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composite = black_or_white1 * black_or_white2
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col = tuple(max(COLOR_A[i] * composite, COLOR_B[i]) for i in range(3))
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pixel.background_color.set( *col )
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20
shaders/ripples.py
Normal file
20
shaders/ripples.py
Normal file
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@ -0,0 +1,20 @@
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import math
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from pixel import Pixel
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def main(pixel: Pixel, resolution: tuple, frag_coord: tuple, time: float): # https://www.shadertoy.com/view/ldX3zr
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invAr = resolution[1] / resolution[0]
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uv = (frag_coord[0] / resolution[0], frag_coord[1] / resolution[1])
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col = [*uv, 0.5 + 0.5 * math.sin(time)]
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x = 0.5 - uv[0]
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y = (0.5 - uv[1]) * invAr
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r = -(x * x + y * y)
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z = 1.0 + 0.5 * math.sin((r + time * 0.035) / 0.013)
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for i in range(3):
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col[i] *= z
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pixel.background_color.set( *col )
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53
shaders/wave.py
Normal file
53
shaders/wave.py
Normal file
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@ -0,0 +1,53 @@
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import math
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from pixel import Pixel
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def main(pixel: Pixel, resolution: tuple, frag_coord: tuple, time: float):
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uv = (frag_coord[0] / resolution[0], frag_coord[1] / resolution[1])
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def hsv2rgb(h, s, v) -> tuple:
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r,g,b = 0,0,0
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i = int(h * 6)
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f = h * 6 - i
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p = v * (1 - s)
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q = v * (1 - f * s)
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t = v * (1 - (1 - f) * s)
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o = i % 6
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if o == 0:
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r,g,b = v,t,p
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elif o == 1:
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r,g,b = q,v,p
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elif o == 2:
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r,g,b = p,v,t
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elif o == 3:
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r,g,b = p,q,v
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elif o == 4:
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r,g,b = t,p,v
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else:
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r,g,b = v,p,q
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return r, g, b
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def step(edge: float, value: float) -> float:
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return 1.0 if value > edge else 0.0
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def strip(h: float, thickness: float, y: float) -> float:
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return step(y + h - thickness, step(1., y + h + thickness))
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col = [0.0, 0.0, 0.0]
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f = 0.0
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while f < math.pi * 2:
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a = strip(.5 + math.cos(uv[0] * 2. + time * 3.) * .15,
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.005,
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uv[1] + math.cos(uv[0] * 3. + time * 2. + f) * .25)
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_col = hsv2rgb(f / math.pi / 2., 1., 1.)
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for i in range(3):
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col[i] += a * _col[i]
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f += math.pi / 4.
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pixel.background_color.set(*col)
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