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'''
Renders a rotating and scaling triangle
'''
import numpy as np
from _example import Example
class UniformsAndAttributes(Example):
gl_version = (3, 3)
def __init__(self, **kwargs):
super().__init__(**kwargs)
self.prog = self.ctx.program(
vertex_shader='''
#version 330
in vec2 vert;
uniform vec2 scale;
uniform float rotation;
void main() {
mat2 rot = mat2(
cos(rotation), sin(rotation),
-sin(rotation), cos(rotation)
);
gl_Position = vec4((rot * vert) * scale, 0.0, 1.0);
}
''',
fragment_shader='''
#version 330
out vec4 color;
void main() {
color = vec4(0.3, 0.5, 1.0, 1.0);
}
''',
)
self.scale = self.prog['scale']
self.rotation = self.prog['rotation']
self.scale.value = (self.wnd.width / self.wnd.height * 0.75, 0.25)
vertices = np.array([
1.0, 0.0,
-0.5, 0.86,
-0.5, -0.86,
], dtype='f4')
self.vbo = self.ctx.buffer(vertices)
self.vao = self.ctx.vertex_array(self.prog, [self.vbo.bind('vert')])
def render(self, time: float, frame_time: float):
sin_scale = np.sin(np.deg2rad(time * 60))
self.ctx.clear(1.0, 1.0, 1.0)
self.vao.render()
self.rotation.value = time
# Change the scale of the triangle sin-ly
self.scale.value = (sin_scale * 0.75, 0.75)
if __name__ == '__main__':
UniformsAndAttributes.run()
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