PyOpenGL_tutorials/video_11_texturing_cube.py at master · totex/PyOpenGL_tutorials · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
import glfw
from OpenGL.GL import *
import OpenGL.GL.shaders
import numpy
import pyrr
from PIL import Image


def main():

    # initialize glfw
    if not glfw.init():
        return

    window = glfw.create_window(800, 600, "My OpenGL window", None, None)

    if not window:
        glfw.terminate()
        return

    glfw.make_context_current(window)
    #        positions         colors          texture coords
    cube = [-0.5, -0.5,  0.5,  1.0, 0.0, 0.0,  0.0, 0.0,
             0.5, -0.5,  0.5,  0.0, 1.0, 0.0,  1.0, 0.0,
             0.5,  0.5,  0.5,  0.0, 0.0, 1.0,  1.0, 1.0,
            -0.5,  0.5,  0.5,  1.0, 1.0, 1.0,  0.0, 1.0,

            -0.5, -0.5, -0.5,  1.0, 0.0, 0.0,  0.0, 0.0,
             0.5, -0.5, -0.5,  0.0, 1.0, 0.0,  1.0, 0.0,
             0.5,  0.5, -0.5,  0.0, 0.0, 1.0,  1.0, 1.0,
            -0.5,  0.5, -0.5,  1.0, 1.0, 1.0,  0.0, 1.0,

             0.5, -0.5, -0.5,  1.0, 0.0, 0.0,  0.0, 0.0,
             0.5,  0.5, -0.5,  0.0, 1.0, 0.0,  1.0, 0.0,
             0.5,  0.5,  0.5,  0.0, 0.0, 1.0,  1.0, 1.0,
             0.5, -0.5,  0.5,  1.0, 1.0, 1.0,  0.0, 1.0,

            -0.5,  0.5, -0.5,  1.0, 0.0, 0.0,  0.0, 0.0,
            -0.5, -0.5, -0.5,  0.0, 1.0, 0.0,  1.0, 0.0,
            -0.5, -0.5,  0.5,  0.0, 0.0, 1.0,  1.0, 1.0,
            -0.5,  0.5,  0.5,  1.0, 1.0, 1.0,  0.0, 1.0,

            -0.5, -0.5, -0.5,  1.0, 0.0, 0.0,  0.0, 0.0,
             0.5, -0.5, -0.5,  0.0, 1.0, 0.0,  1.0, 0.0,
             0.5, -0.5,  0.5,  0.0, 0.0, 1.0,  1.0, 1.0,
            -0.5, -0.5,  0.5,  1.0, 1.0, 1.0,  0.0, 1.0,

             0.5,  0.5, -0.5,  1.0, 0.0, 0.0,  0.0, 0.0,
            -0.5,  0.5, -0.5,  0.0, 1.0, 0.0,  1.0, 0.0,
            -0.5,  0.5,  0.5,  0.0, 0.0, 1.0,  1.0, 1.0,
             0.5,  0.5,  0.5,  1.0, 1.0, 1.0,  0.0, 1.0]

    cube = numpy.array(cube, dtype = numpy.float32)

    indices = [ 0,  1,  2,  2,  3,  0,
                4,  5,  6,  6,  7,  4,
                8,  9, 10, 10, 11,  8,
               12, 13, 14, 14, 15, 12,
               16, 17, 18, 18, 19, 16,
               20, 21, 22, 22, 23, 20]

    indices = numpy.array(indices, dtype= numpy.uint32)

    vertex_shader = """
    #version 330
    in layout(location = 0) vec3 position;
    in layout(location = 1) vec3 color;
    in layout(location = 2) vec2 textureCoords;
    uniform mat4 transform;
    out vec3 newColor;
    out vec2 newTexture;
    void main()
    {
        gl_Position = transform * vec4(position, 1.0f);
        newColor = color;
        newTexture = textureCoords;
    }
    """

    fragment_shader = """
    #version 330
    in vec3 newColor;
    in vec2 newTexture;

    out vec4 outColor;
    uniform sampler2D samplerTexture;
    void main()
    {
        outColor = texture(samplerTexture, newTexture) * vec4(newColor, 1.0f);
    }
    """
    shader = OpenGL.GL.shaders.compileProgram(OpenGL.GL.shaders.compileShader(vertex_shader, GL_VERTEX_SHADER),
                                              OpenGL.GL.shaders.compileShader(fragment_shader, GL_FRAGMENT_SHADER))

    VBO = glGenBuffers(1)
    glBindBuffer(GL_ARRAY_BUFFER, VBO)
    glBufferData(GL_ARRAY_BUFFER, cube.itemsize * len(cube), cube, GL_STATIC_DRAW)

    EBO = glGenBuffers(1)
    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, EBO)
    glBufferData(GL_ELEMENT_ARRAY_BUFFER, indices.itemsize * len(indices), indices, GL_STATIC_DRAW)

    #position
    glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, cube.itemsize * 8, ctypes.c_void_p(0))
    glEnableVertexAttribArray(0)
    #color
    glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, cube.itemsize * 8, ctypes.c_void_p(12))
    glEnableVertexAttribArray(1)
    #texture
    glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, cube.itemsize * 8, ctypes.c_void_p(24))
    glEnableVertexAttribArray(2)


    texture = glGenTextures(1)
    glBindTexture(GL_TEXTURE_2D, texture)
    # Set the texture wrapping parameters
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT)
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT)
    # Set texture filtering parameters
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR)
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR)
    # load image
    image = Image.open("res/crate.jpg")
    img_data = numpy.array(list(image.getdata()), numpy.uint8)
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, image.width, image.height, 0, GL_RGB, GL_UNSIGNED_BYTE, img_data)
    glEnable(GL_TEXTURE_2D)


    glUseProgram(shader)

    glClearColor(0.2, 0.3, 0.2, 1.0)
    glEnable(GL_DEPTH_TEST)
    #glPolygonMode(GL_FRONT_AND_BACK, GL_LINE)

    while not glfw.window_should_close(window):
        glfw.poll_events()

        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)

        rot_x = pyrr.Matrix44.from_x_rotation(0.5 * glfw.get_time() )
        rot_y = pyrr.Matrix44.from_y_rotation(0.8 * glfw.get_time() )

        transformLoc = glGetUniformLocation(shader, "transform")
        glUniformMatrix4fv(transformLoc, 1, GL_FALSE, rot_x * rot_y)

        glDrawElements(GL_TRIANGLES, len(indices), GL_UNSIGNED_INT, None)

        glfw.swap_buffers(window)

    glfw.terminate()

if __name__ == "__main__":
    main()