diff options
Diffstat (limited to 'examples/quick/rendercontrol/rendercontrol_opengl/cuberenderer.py')
| -rw-r--r-- | examples/quick/rendercontrol/rendercontrol_opengl/cuberenderer.py | 183 |
1 files changed, 183 insertions, 0 deletions
diff --git a/examples/quick/rendercontrol/rendercontrol_opengl/cuberenderer.py b/examples/quick/rendercontrol/rendercontrol_opengl/cuberenderer.py new file mode 100644 index 000000000..69e7321f9 --- /dev/null +++ b/examples/quick/rendercontrol/rendercontrol_opengl/cuberenderer.py @@ -0,0 +1,183 @@ +# 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) |