Created
February 10, 2018 03:13
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| effect_drop_shadow = ''' | |
| #define M_PI 3.1415926535897932384626433832795 | |
| vec4 effect(vec4 color, sampler2D texture, vec2 tex_coords, vec2 coords) {{ | |
| vec2 coords2; | |
| float x, y; | |
| float radius, sampling, surface; | |
| vec4 tint, shadow; | |
| coords2 = coords + vec2({offset_x:f}, {offset_y:f}) ; | |
| radius = {radius:f}; | |
| sampling = {sampling:f}; | |
| tint = vec4({r:f}, {g:f}, {b:f}, {a:f}); | |
| if (color.a >= .99) | |
| return color; | |
| surface = (sampling * M_PI * radius * radius) / 2.; | |
| shadow = vec4(0., 0., 0., 0.); | |
| for (x = -radius; x < radius; x += sampling) | |
| for (y = -radius; y < radius; y += sampling) | |
| if (length(vec2(x, y)) <= radius) | |
| shadow += texture2D( | |
| texture, | |
| vec2(coords2.x + x, coords2.y + y) / resolution | |
| ).a * tint / surface; | |
| return color + shadow * (shadow.a - color.a); | |
| }} | |
| ''' | |
| class DropShadowEffect(EffectBase): | |
| '''Add DropShadow to the input.''' | |
| offset = ListProperty([0, 0]) | |
| tint = ListProperty([0, 0, 0, 1]) | |
| radius = NumericProperty(1) | |
| sampling = NumericProperty(1) | |
| def __init__(self, *args, **kwargs): | |
| super(DropShadowEffect, self).__init__(*args, **kwargs) | |
| self.fbind('offset', self.do_glsl) | |
| self.fbind('tint', self.do_glsl) | |
| self.fbind('radius', self.do_glsl) | |
| self.fbind('sampling', self.do_glsl) | |
| self.do_glsl() | |
| def on_size(self, *args): | |
| self.do_glsl() | |
| def do_glsl(self, *args): | |
| self.glsl = effect_drop_shadow.format( | |
| offset_x=self.offset[0], | |
| offset_y=self.offset[1], | |
| radius=self.radius, | |
| sampling=self.sampling, | |
| r=self.tint[0], | |
| g=self.tint[1], | |
| b=self.tint[2], | |
| a=self.tint[3], | |
| ) |
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