gl_FragColor = vec4(v_color.rgb, 1.0);
}
"""
borders = Filter(
1024, 1024, """
const float epsilon = 1e-3;
vec4 filter(sampler2D original, sampler2D filtered, vec2 texcoord, vec2 texsize)
{
vec4 center = texture2D(filtered, texcoord);
vec4 left = texture2D(filtered, texcoord + vec2(-1.0, 0.0)/texsize);
vec4 right = texture2D(filtered, texcoord + vec2(+1.0, 0.0)/texsize);
vec4 down = texture2D(filtered, texcoord + vec2( 0.0,-1.0)/texsize);
vec4 up = texture2D(filtered, texcoord + vec2( 0.0,+1.0)/texsize);
vec4 black = vec4(0,0,0,1);
float level = 0.5;
if (length(center-left) > epsilon) {
return mix(black,right, level);
} else if (length(center-right) > epsilon) {
return mix(black, left, level);
} else if (length(center-down) > epsilon) {
return mix(black, up, level);
} else if (length(center-up) > epsilon) {
return mix(black, down, level);
}
return center;
} """)
window = app.Window(width=1024, height=1024)
cube_fragment = """
uniform sampler2D texture;
varying vec2 v_texcoord;
void main()
{
float r = texture2D(texture, v_texcoord).r;
gl_FragColor = vec4(vec3(r),1.0);
}
"""
pixelate = Filter(
512, 512, """
uniform float level;
vec4 filter(sampler2D original, sampler2D filtered, vec2 texcoord, vec2 texsize)
{
vec2 uv = (texcoord * level);
uv = (uv - fract(uv)) / level;
return texture2D(filtered, uv);
} """)
pixelate["level"] = 256.0
window = app.Window(1024, 1024)
@window.event
def on_draw(dt):
global phi, theta
with pixelate:
window.clear()
+ 0.3162162162 * (texture2D( filtered, texcoord + vec2(0.0, 1.3846153846)/texsize) +
texture2D( filtered, texcoord - vec2(0.0, 1.3846153846)/texsize) )
+ 0.0702702703 * (texture2D( filtered, texcoord + vec2(0.0, 3.2307692308)/texsize) +
texture2D( filtered, texcoord - vec2(0.0, 3.2307692308)/texsize) );
}""")
HBlur = gloo.Snippet("""
vec4 filter(sampler2D original, sampler2D filtered, vec2 texcoord, vec2 texsize)
{
return 0.2270270270 * texture2D( filtered, texcoord)
+ 0.3162162162 * (texture2D( filtered, texcoord + vec2(1.3846153846, 0.0)/texsize) +
texture2D( filtered, texcoord - vec2(1.3846153846, 0.0)/texsize) )
+ 0.0702702703 * (texture2D( filtered, texcoord + vec2(3.2307692308, 0.0)/texsize) +
texture2D( filtered, texcoord - vec2(3.2307692308, 0.0)/texsize) );
}""")
GaussianBlur = Filter(512, 512, VBlur, HBlur)
@window.event
def on_draw(dt):
global phi, theta
with GaussianBlur:
window.clear()
gl.glEnable(gl.GL_DEPTH_TEST)
cube.draw(gl.GL_TRIANGLES, faces)
theta += 0.5 # degrees
phi += 0.5 # degrees
model = np.eye(4, dtype=np.float32)
glm.rotate(model, theta, 0, 0, 1)
return texture2D(filtered, uv);
} """)
sepia = gloo.Snippet("""
vec4 filter(vec4 color)
{
return vec4( dot(color.rgb, vec3(.393, .769, .189)),
dot(color.rgb, vec3(.349, .686, .168)),
dot(color.rgb, vec3(.272, .534, .131)),
color.a );
}
vec4 filter(sampler2D original, sampler2D filtered, vec2 texcoord, vec2 texsize)
{
return filter( texture2D(filtered, texcoord) );
}
""")
compose = Filter(512, 512, sepia(pixelate))
compose["level"] = 128.0
window = app.Window(1024, 1024)
@window.event
def on_draw(dt):
global phi, theta
with compose:
window.clear()
gl.glEnable(gl.GL_DEPTH_TEST)
cube.draw(gl.GL_TRIANGLES, faces)
theta += 0.5
phi += 0.5