通过Python OpenGL的point sprite技术绘制雪花

import numpy as np
import wxgl
from wxgl import wxplot as plt

vshader_src = """
    #version 330 core
    in vec4 a_Position;
    uniform mat4 u_MVPMatrix;
    void main() { 
        gl_Position = u_MVPMatrix * a_Position; 
        gl_PointSize = (a_Position.z + 1) * 30;
    }
"""

fshader_src = """
    #version 330 core
    uniform sampler2D u_Snow_1;
    in float idx;
    void main() { 
        gl_FragColor = texture2D(u_Snow_1, gl_PointCoord); 
    } 
"""

m = wxgl.Model(wxgl.POINTS, vshader_src, fshader_src, sprite=True) # 通过sprite=Treue开启点精灵
m.set_vertex('a_Position', np.random.random((300, 3))*2-1) # 随机生成300个点
m.add_texture('u_Snow_1', 'res/image/snow_1.png', wxgl.TEXTURE_2D) # 添加雪花纹理
m.set_mvp_matrix('u_MVPMatrix') # 设置模型矩阵、视点矩阵和投影矩阵

plt.model(m)
plt.show()

import numpy as np
import wxgl
from wxgl import wxplot as plt

vshader_src = """
    #version 330 core
    in vec4 a_Position;
    uniform mat4 u_MVPMatrix;
    void main() { 
        gl_Position = u_MVPMatrix * a_Position; 
        gl_PointSize = (a_Position.z + 1) * 30;
    }
"""

fshader_src = """
    #version 330 core
    uniform sampler2D u_Snow_1;
    uniform sampler2D u_Snow_2;
    in float idx;
    void main() { 
        if (fract(sin(dot(gl_PointCoord ,vec2(12.9898,78.233))) * 43758.5453) < 0.5) {
            gl_FragColor = texture2D(u_Snow_1, gl_PointCoord); 
        } else {
            gl_FragColor = texture2D(u_Snow_2, gl_PointCoord);
        }
    } 
"""

m = wxgl.Model(wxgl.POINTS, vshader_src, fshader_src, sprite=True) # 通过sprite=Treue开启点精灵
m.set_vertex('a_Position', np.random.random((300, 3))*2-1) # 随机生成300个点
m.add_texture('u_Snow_1', 'res/image/snow_1.png', wxgl.TEXTURE_2D) # 添加雪花纹理1
m.add_texture('u_Snow_2', 'res/image/snow_2.png', wxgl.TEXTURE_2D) # 添加雪花纹理2
m.set_mvp_matrix('u_MVPMatrix') # 设置模型矩阵、视点矩阵和投影矩阵

plt.model(m)
plt.show()