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
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
|
# Copyright (C) 2022 The Qt Company Ltd.
# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
import ctypes
import numpy
from OpenGL.GL import (GL_COLOR_BUFFER_BIT, GL_CULL_FACE, GL_CW,
GL_DEPTH_BUFFER_BIT, GL_DEPTH_TEST, GL_FALSE, GL_FLOAT,
GL_TEXTURE_2D, GL_TRIANGLES)
from PySide6.QtGui import QMatrix4x4, QOpenGLContext
from PySide6.QtOpenGL import (QOpenGLBuffer, QOpenGLShader,
QOpenGLShaderProgram, QOpenGLVertexArrayObject)
from shiboken6 import VoidPtr
VERTEXSHADER_SOURCE = """attribute highp vec4 vertex;
attribute lowp vec2 coord;
varying lowp vec2 v_coord;
uniform highp mat4 matrix;
void main() {
v_coord = coord;
gl_Position = matrix * vertex;
}
"""
FRAGMENTSHADER_SOURCE = """varying lowp vec2 v_coord;
uniform sampler2D sampler;
void main() {
gl_FragColor = vec4(texture2D(sampler, v_coord).rgb, 1.0);
}
"""
FLOAT_SIZE = ctypes.sizeof(ctypes.c_float)
VERTEXES = numpy.array([-0.5, 0.5, 0.5, 0.5, -0.5, 0.5, -0.5, -0.5, 0.5,
0.5, -0.5, 0.5, -0.5, 0.5, 0.5, 0.5, 0.5, 0.5,
-0.5, -0.5, -0.5, 0.5, -0.5, -0.5, -0.5, 0.5, -0.5,
0.5, 0.5, -0.5, -0.5, 0.5, -0.5, 0.5, -0.5, -0.5,
0.5, -0.5, -0.5, 0.5, -0.5, 0.5, 0.5, 0.5, -0.5,
0.5, 0.5, 0.5, 0.5, 0.5, -0.5, 0.5, -0.5, 0.5,
-0.5, 0.5, -0.5, -0.5, -0.5, 0.5, -0.5, -0.5, -0.5,
-0.5, -0.5, 0.5, -0.5, 0.5, -0.5, -0.5, 0.5, 0.5,
0.5, 0.5, -0.5, -0.5, 0.5, 0.5, -0.5, 0.5, -0.5,
-0.5, 0.5, 0.5, 0.5, 0.5, -0.5, 0.5, 0.5, 0.5,
-0.5, -0.5, -0.5, -0.5, -0.5, 0.5, 0.5, -0.5, -0.5,
0.5, -0.5, 0.5, 0.5, -0.5, -0.5, -0.5, -0.5, 0.5],
dtype=numpy.float32)
TEX_COORDS = numpy.array([0.0, 0.0, 1.0, 1.0, 1.0, 0.0,
1.0, 1.0, 0.0, 0.0, 0.0, 1.0,
1.0, 1.0, 1.0, 0.0, 0.0, 1.0,
0.0, 0.0, 0.0, 1.0, 1.0, 0.0,
1.0, 1.0, 1.0, 0.0, 0.0, 1.0,
0.0, 0.0, 0.0, 1.0, 1.0, 0.0,
0.0, 0.0, 1.0, 1.0, 1.0, 0.0,
1.0, 1.0, 0.0, 0.0, 0.0, 1.0,
0.0, 1.0, 1.0, 0.0, 1.0, 1.0,
1.0, 0.0, 0.0, 1.0, 0.0, 0.0,
1.0, 0.0, 1.0, 1.0, 0.0, 0.0,
0.0, 1.0, 0.0, 0.0, 1.0, 1.0], dtype=numpy.float32)
class CubeRenderer():
def __init__(self, offscreenSurface):
self.m_angle = 0
self.m_offscreenSurface = offscreenSurface
self.m_context = None
self.m_program = None
self.m_vbo = None
self.m_vao = None
self.m_matrixLoc = 0
self.m_proj = QMatrix4x4()
def __del__(self):
# Use a temporary offscreen surface to do the cleanup. There may not
# be a native window surface available anymore at self stage.
self.m_context.makeCurrent(self.m_offscreenSurface)
del self.m_program
del self.m_vbo
del self.m_vao
self.m_context.doneCurrent()
def init(self, w, share):
self.m_context = QOpenGLContext()
self.m_context.setShareContext(share)
self.m_context.setFormat(w.requestedFormat())
self.m_context.create()
if not self.m_context.makeCurrent(w):
return
f = self.m_context.functions()
f.glClearColor(0.0, 0.1, 0.25, 1.0)
f.glViewport(0, 0, w.width() * w.devicePixelRatio(),
w.height() * w.devicePixelRatio())
self.m_program = QOpenGLShaderProgram()
self.m_program.addCacheableShaderFromSourceCode(QOpenGLShader.Vertex,
VERTEXSHADER_SOURCE)
self.m_program.addCacheableShaderFromSourceCode(QOpenGLShader.Fragment,
FRAGMENTSHADER_SOURCE)
self.m_program.bindAttributeLocation("vertex", 0)
self.m_program.bindAttributeLocation("coord", 1)
self.m_program.link()
self.m_matrixLoc = self.m_program.uniformLocation("matrix")
self.m_vao = QOpenGLVertexArrayObject()
self.m_vao.create()
self.m_vbo = QOpenGLBuffer()
self.m_vbo.create()
self.m_vbo.bind()
vertexCount = 36
self.m_vbo.allocate(FLOAT_SIZE * vertexCount * 5)
vertex_data = VERTEXES.tobytes()
tex_coord_data = TEX_COORDS.tobytes()
self.m_vbo.write(0, VoidPtr(vertex_data),
FLOAT_SIZE * vertexCount * 3)
self.m_vbo.write(FLOAT_SIZE * vertexCount * 3,
VoidPtr(tex_coord_data),
FLOAT_SIZE * vertexCount * 2)
self.m_vbo.release()
if self.m_vao.isCreated():
self.setupVertexAttribs()
def resize(self, w, h):
self.m_proj.setToIdentity()
self.m_proj.perspective(45, w / float(h), 0.01, 100.0)
def setupVertexAttribs(self):
self.m_vbo.bind()
self.m_program.enableAttributeArray(0)
self.m_program.enableAttributeArray(1)
f = self.m_context.functions()
null = VoidPtr(0)
pointer = VoidPtr(36 * 3 * FLOAT_SIZE)
f.glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0, null)
f.glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 0, pointer)
self.m_vbo.release()
def render(self, w, share, texture):
if not self.m_context:
self.init(w, share)
if not self.m_context.makeCurrent(w):
return
f = self.m_context.functions()
f.glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)
if texture:
f.glBindTexture(GL_TEXTURE_2D, texture)
f.glFrontFace(GL_CW) # because our cube's vertex data is such
f.glEnable(GL_CULL_FACE)
f.glEnable(GL_DEPTH_TEST)
self.m_program.bind()
# If VAOs are not supported, set the vertex attributes every time.
if not self.m_vao.isCreated():
self.setupVertexAttribs()
m = QMatrix4x4()
m.translate(0, 0, -2)
m.rotate(90, 0, 0, 1)
m.rotate(self.m_angle, 0.5, 1, 0)
self.m_angle += 0.5
self.m_program.setUniformValue(self.m_matrixLoc, self.m_proj * m)
# Draw the cube.
f.glDrawArrays(GL_TRIANGLES, 0, 36)
self.m_context.swapBuffers(w)
|
