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# Copyright (C) 2023 The Qt Company Ltd.
# Copyright (C) 2013 Riverbank Computing Limited.
# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
import ctypes
from PySide6.QtCore import Signal, Slot, Qt, QSize, QPointF
from PySide6.QtGui import (QVector3D, QOpenGLFunctions,
QMatrix4x4, QOpenGLContext, QSurfaceFormat)
from PySide6.QtOpenGL import (QOpenGLVertexArrayObject, QOpenGLBuffer,
QOpenGLShaderProgram, QOpenGLShader)
from PySide6.QtOpenGLWidgets import QOpenGLWidget
from OpenGL import GL
from shiboken6 import VoidPtr
from logo import Logo
FRAGMENT_SHADER_SOURCE_CORE = """#version 150
in highp vec3 vert;
in highp vec3 vertNormal;
out highp vec4 fragColor;
uniform highp vec3 lightPos;
void main() {
highp vec3 L = normalize(lightPos - vert);
highp float NL = max(dot(normalize(vertNormal), L), 0.0);
highp vec3 color = vec3(0.39, 1.0, 0.0);
highp vec3 col = clamp(color * 0.2 + color * 0.8 * NL, 0.0, 1.0);
fragColor = vec4(col, 1.0);
}"""
FRAGMENT_SHADER_SOURCE = """varying highp vec3 vert;
varying highp vec3 vertNormal;
uniform highp vec3 lightPos;
void main() {
highp vec3 L = normalize(lightPos - vert);
highp float NL = max(dot(normalize(vertNormal), L), 0.0);
highp vec3 color = vec3(0.39, 1.0, 0.0);
highp vec3 col = clamp(color * 0.2 + color * 0.8 * NL, 0.0, 1.0);
gl_FragColor = vec4(col, 1.0);
}"""
VERTEX_SHADER_SOURCE_CORE = """#version 150
in vec4 vertex;
in vec3 normal;
out vec3 vert;
out vec3 vertNormal;
uniform mat4 projMatrix;
uniform mat4 mvMatrix;
uniform mat3 normalMatrix;
void main() {
vert = vertex.xyz;
vertNormal = normalMatrix * normal;
gl_Position = projMatrix * mvMatrix * vertex;
}"""
VERTEX_SHADER_SOURCE = """attribute vec4 vertex;
attribute vec3 normal;
varying vec3 vert;
varying vec3 vertNormal;
uniform mat4 projMatrix;
uniform mat4 mvMatrix;
uniform mat3 normalMatrix;
void main() {
vert = vertex.xyz;
vertNormal = normalMatrix * normal;
gl_Position = projMatrix * mvMatrix * vertex;
}"""
class GLWidget(QOpenGLWidget, QOpenGLFunctions):
x_rotation_changed = Signal(int)
y_rotation_changed = Signal(int)
z_rotation_changed = Signal(int)
_transparent = False
def __init__(self, parent=None):
QOpenGLWidget.__init__(self, parent)
QOpenGLFunctions.__init__(self)
self._core = QSurfaceFormat.defaultFormat().profile() == QSurfaceFormat.CoreProfile
self._x_rot = 0
self._y_rot = 0
self._z_rot = 0
self._last_pos = QPointF()
self.logo = Logo()
self.vao = QOpenGLVertexArrayObject()
self._logo_vbo = QOpenGLBuffer()
self.program = QOpenGLShaderProgram()
self._proj_matrix_loc = 0
self._mv_matrix_loc = 0
self._normal_matrix_loc = 0
self._light_pos_loc = 0
self.proj = QMatrix4x4()
self.camera = QMatrix4x4()
self.world = QMatrix4x4()
if self._transparent:
fmt = self.format()
fmt.setAlphaBufferSize(8)
self.setFormat(fmt)
@staticmethod
def set_transparent(t):
GLWidget._transparent = t
@staticmethod
def is_transparent():
return GLWidget._transparent
def x_rotation(self):
return self._x_rot
def y_rotation(self):
return self._y_rot
def z_rotation(self):
return self._z_rot
def minimumSizeHint(self):
return QSize(50, 50)
def sizeHint(self):
return QSize(400, 400)
def normalize_angle(self, angle):
while angle < 0:
angle += 360 * 16
while angle > 360 * 16:
angle -= 360 * 16
return angle
@Slot(int)
def set_xrotation(self, angle):
angle = self.normalize_angle(angle)
if angle != self._x_rot:
self._x_rot = angle
self.x_rotation_changed.emit(angle)
self.update()
@Slot(int)
def set_yrotation(self, angle):
angle = self.normalize_angle(angle)
if angle != self._y_rot:
self._y_rot = angle
self.y_rotation_changed.emit(angle)
self.update()
@Slot(int)
def set_zrotation(self, angle):
angle = self.normalize_angle(angle)
if angle != self._z_rot:
self._z_rot = angle
self.z_rotation_changed.emit(angle)
self.update()
@Slot()
def cleanup(self):
if self.program:
self.makeCurrent()
self._logo_vbo.destroy()
del self.program
self.program = None
self.doneCurrent()
def initializeGL(self):
self.initializeOpenGLFunctions()
self.glClearColor(0, 0, 0, 0 if self._transparent else 1)
self.program = QOpenGLShaderProgram()
if self._core:
self._vertex_shader = VERTEX_SHADER_SOURCE_CORE
self._fragment_shader = FRAGMENT_SHADER_SOURCE_CORE
else:
self._vertex_shader = VERTEX_SHADER_SOURCE
self._fragment_shader = FRAGMENT_SHADER_SOURCE
self.program.addShaderFromSourceCode(QOpenGLShader.Vertex,
self._vertex_shader)
self.program.addShaderFromSourceCode(QOpenGLShader.Fragment,
self._fragment_shader)
self.program.bindAttributeLocation("vertex", 0)
self.program.bindAttributeLocation("normal", 1)
self.program.link()
self.program.bind()
self._proj_matrix_loc = self.program.uniformLocation("projMatrix")
self._mv_matrix_loc = self.program.uniformLocation("mvMatrix")
self._normal_matrix_loc = self.program.uniformLocation("normalMatrix")
self._light_pos_loc = self.program.uniformLocation("lightPos")
self.vao.create()
with QOpenGLVertexArrayObject.Binder(self.vao):
self._logo_vbo.create()
self._logo_vbo.bind()
float_size = ctypes.sizeof(ctypes.c_float)
self._logo_vbo.allocate(self.logo.const_data(),
self.logo.count() * float_size)
self.setup_vertex_attribs()
self.camera.setToIdentity()
self.camera.translate(0, 0, -1)
self.program.setUniformValue(self._light_pos_loc,
QVector3D(0, 0, 70))
self.program.release()
def setup_vertex_attribs(self):
self._logo_vbo.bind()
f = QOpenGLContext.currentContext().functions()
f.glEnableVertexAttribArray(0)
f.glEnableVertexAttribArray(1)
float_size = ctypes.sizeof(ctypes.c_float)
null = VoidPtr(0)
pointer = VoidPtr(3 * float_size)
f.glVertexAttribPointer(0, 3, int(GL.GL_FLOAT), int(GL.GL_FALSE),
6 * float_size, null)
f.glVertexAttribPointer(1, 3, int(GL.GL_FLOAT), int(GL.GL_FALSE),
6 * float_size, pointer)
self._logo_vbo.release()
def paintGL(self):
self.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT)
self.glEnable(GL.GL_DEPTH_TEST)
self.glEnable(GL.GL_CULL_FACE)
self.world.setToIdentity()
self.world.rotate(180 - (self._x_rot / 16), 1, 0, 0)
self.world.rotate(self._y_rot / 16, 0, 1, 0)
self.world.rotate(self._z_rot / 16, 0, 0, 1)
with QOpenGLVertexArrayObject.Binder(self.vao):
self.program.bind()
self.program.setUniformValue(self._proj_matrix_loc, self.proj)
self.program.setUniformValue(self._mv_matrix_loc,
self.camera * self.world)
normal_matrix = self.world.normalMatrix()
self.program.setUniformValue(self._normal_matrix_loc, normal_matrix)
self.glDrawArrays(GL.GL_TRIANGLES, 0, self.logo.vertex_count())
self.program.release()
def resizeGL(self, width, height):
self.proj.setToIdentity()
self.proj.perspective(45, width / height, 0.01, 100)
def hideEvent(self, event):
self.cleanup()
super().hideEvent(event)
def mousePressEvent(self, event):
self._last_pos = event.position()
def mouseMoveEvent(self, event):
pos = event.position()
dx = pos.x() - self._last_pos.x()
dy = pos.y() - self._last_pos.y()
if event.buttons() & Qt.LeftButton:
self.set_xrotation(self._x_rot + 8 * dy)
self.set_yrotation(self._y_rot + 8 * dx)
elif event.buttons() & Qt.RightButton:
self.set_xrotation(self._x_rot + 8 * dy)
self.set_zrotation(self._z_rot + 8 * dx)
self._last_pos = pos
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