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import numpy as np
import pymunk
from pymunk import Vec2d
import moderngl
from _example import Example
class PymunkExample(Example):
title = "Using PyMunk"
gl_version = (3, 3)
def __init__(self, **kwargs):
super().__init__(**kwargs)
self.prog = self.ctx.program(
vertex_shader='''
#version 330
uniform vec4 Camera;
// Per vertex
in vec2 in_vert;
in vec2 in_texture;
// Per instance
in vec3 in_pos;
in vec2 in_size;
in vec4 in_tint;
out vec2 v_vert;
out vec2 v_texture;
out vec4 v_tint;
void main() {
mat2 rotate = mat2(
cos(in_pos.z), sin(in_pos.z),
-sin(in_pos.z), cos(in_pos.z)
);
v_vert = rotate * (in_vert * in_size) + in_pos.xy;
gl_Position = vec4((v_vert - Camera.xy) / Camera.zw, 0.0, 1.0);
v_texture = in_texture;
v_tint = in_tint;
}
''',
fragment_shader='''
#version 330
uniform sampler2D Texture;
in vec2 v_vert;
in vec2 v_texture;
in vec4 v_tint;
out vec4 f_color;
void main() {
vec4 tex = texture(Texture, v_texture);
vec3 color = tex.rgb * (1.0 - v_tint.a) + v_tint.rgb * v_tint.a;
f_color = vec4(color, tex.a);
}
''',
)
self.tex1 = self.load_texture_2d('crate.png')
self.tex1.use(0)
self.tex2 = self.load_texture_2d('ball.png')
self.tex2.use(1)
vertices = np.array([
-1.0, -1.0, 0.0, 0.0,
-1.0, 1.0, 0.0, 1.0,
1.0, -1.0, 1.0, 0.0,
1.0, 1.0, 1.0, 1.0,
])
vbo1 = self.ctx.buffer(vertices.astype('f4'))
self.vbo2 = self.ctx.buffer(reserve=1024 * 1024)
vao_content = [
(vbo1, '2f 2f', 'in_vert', 'in_texture'),
(self.vbo2, '3f 2f 4f/i', 'in_pos', 'in_size', 'in_tint'),
]
self.vao = self.ctx.vertex_array(self.prog, vao_content)
self.space = pymunk.Space()
self.space.gravity = (0.0, -900.0)
shape = pymunk.Segment(self.space.static_body, (5, 100), (595, 100), 1.0)
shape.friction = 1.0
self.space.add(shape)
self.bodies = []
self.balls = []
for x in range(5):
for y in range(10):
size = 20
mass = 10.0
moment = pymunk.moment_for_box(mass, (size, size))
body = pymunk.Body(mass, moment)
body.position = Vec2d(300 + x * 50, 105 + y * (size + 0.1))
shape = pymunk.Poly.create_box(body, (size, size))
shape.friction = 0.3
self.space.add(body, shape)
self.bodies.append(body)
def shoot(self):
mass = 100
r = 15
moment = pymunk.moment_for_circle(mass, 0, r, (0, 0))
body = pymunk.Body(mass, moment)
body.position = (0, 165)
shape = pymunk.Circle(body, r, (0, 0))
shape.friction = 0.3
self.space.add(body, shape)
f = 50000
body.apply_impulse_at_local_point((f, 0), (0, 0))
self.balls.append(body)
def mouse_press_event(self, x: int, y: int, button: int):
self.shoot()
def key_event(self, key, action, modifiers):
if action == self.wnd.keys.ACTION_PRESS:
self.shoot()
def render(self, time, frame_time):
width, height = self.wnd.size
self.ctx.clear(1.0, 1.0, 1.0)
self.ctx.enable(moderngl.BLEND)
for i in range(10):
self.space.step(1 / 60 / 10)
self.prog['Camera'].value = (200, 300, width / 2, height / 2)
bodies = np.array([(b.position.x, b.position.y, b.angle, 10, 10, 1, 1, 1, 0) for b in self.bodies], dtype='f4')
self.vbo2.write(bodies)
self.prog['Texture'].value = 0
self.vao.render(moderngl.TRIANGLE_STRIP, instances=len(self.bodies))
self.vbo2.orphan()
balls = np.array([(b.position.x, b.position.y, b.angle, 15, 15, 1, 1, 1, 0) for b in self.balls], dtype='f4')
self.vbo2.write(balls)
self.prog['Texture'].value = 1
self.vao.render(moderngl.TRIANGLE_STRIP, instances=len(self.balls))
if __name__ == '__main__':
PymunkExample.run()
|
