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authorFriedemann Kleint <Friedemann.Kleint@qt.io>2023-10-18 10:28:54 +0200
committerFriedemann Kleint <Friedemann.Kleint@qt.io>2024-02-26 10:03:19 +0100
commit517893325daabbc77b0740b4e85f0214d49c93fa (patch)
treeb5f4aa24f975dd879bd4999fb7eb26f25812468d /examples
parent94869cf1cacb1a5c2d722f49feb8e8af895144bc (diff)
Port the simplerhiwidget example
Task-number: QTBUG-113331 Task-number: PYSIDE-2497 Task-number: PYSIDE-2206 Change-Id: I69b69a761eb4485b8a0f6c14d92065b0699336ea Reviewed-by: Shyamnath Premnadh <Shyamnath.Premnadh@qt.io>
Diffstat (limited to 'examples')
-rw-r--r--examples/gui/rhiwindow/doc/rhiwindow.rst10
-rw-r--r--examples/widgets/rhi/simplerhiwidget/doc/simplerhiwidget.rst34
-rw-r--r--examples/widgets/rhi/simplerhiwidget/doc/simplerhiwidget.webpbin0 -> 8556 bytes
-rw-r--r--examples/widgets/rhi/simplerhiwidget/examplewidget.py135
-rw-r--r--examples/widgets/rhi/simplerhiwidget/main.py35
-rw-r--r--examples/widgets/rhi/simplerhiwidget/rc_simplerhiwidget.py163
-rw-r--r--examples/widgets/rhi/simplerhiwidget/shader_assets/color.frag.qsbbin0 -> 738 bytes
-rw-r--r--examples/widgets/rhi/simplerhiwidget/shader_assets/color.vert.qsbbin0 -> 1091 bytes
-rw-r--r--examples/widgets/rhi/simplerhiwidget/shaders/color.frag10
-rw-r--r--examples/widgets/rhi/simplerhiwidget/shaders/color.vert16
-rw-r--r--examples/widgets/rhi/simplerhiwidget/simplerhiwidget.pyproject4
-rw-r--r--examples/widgets/rhi/simplerhiwidget/simplerhiwidget.qrc6
12 files changed, 406 insertions, 7 deletions
diff --git a/examples/gui/rhiwindow/doc/rhiwindow.rst b/examples/gui/rhiwindow/doc/rhiwindow.rst
index f38f9af63..defbc46ef 100644
--- a/examples/gui/rhiwindow/doc/rhiwindow.rst
+++ b/examples/gui/rhiwindow/doc/rhiwindow.rst
@@ -1,3 +1,5 @@
+.. _rhi-window-example:
+
RHI Window Example
==================
@@ -28,13 +30,7 @@ platform/API specifics or correctly handling ``QExposeEvent`` and resize events
for the window are all managed by Qt Quick. Whereas in this example, all that
is managed and taken care of by the application itself.
-.. note:: For ``QWidget``-based applications in particular, it should be noted
- that ``QWidget::createWindowContainer()`` allows embedding a ``QWindow``
- (backed by a native window) into the widget-based user interface. Therefore,
- the ``HelloWindow`` class from this example is reusable in ``QWidget``-based
- applications, assuming the necessary initialization from ``main()`` is in place
- as well.
-
+.. note:: For ``QWidget``-based applications, see the :ref:`rhi-widget-example`.
Shaders
-------
diff --git a/examples/widgets/rhi/simplerhiwidget/doc/simplerhiwidget.rst b/examples/widgets/rhi/simplerhiwidget/doc/simplerhiwidget.rst
new file mode 100644
index 000000000..c33c6660a
--- /dev/null
+++ b/examples/widgets/rhi/simplerhiwidget/doc/simplerhiwidget.rst
@@ -0,0 +1,34 @@
+.. _rhi-widget-example:
+
+Simple RHI Widget Example
+=========================
+
+Shows how to render a triangle using ``QRhi``, Qt's 3D API and shading
+language abstraction layer.
+
+This example is, in many ways, the counterpart of the :ref:`rhi-window-example`
+in the QWidget world. The ``QRhiWidget`` subclass in this applications renders
+a single triangle, using a simple graphics pipeline with basic vertex and
+fragment shaders. Unlike the plain ``QWindow``-based application, this example
+does not need to worry about lower level details, such as setting up the window
+and the ``QRhi``, or dealing with swapchain and window events, as that is taken
+care of by the ``QWidget`` framework here. The instance of the ``QRhiWidget``
+subclass is added to a ``QVBoxLayout``. To keep the example minimal and
+compact, there are no further widgets or 3D content introduced.
+
+Once an instance of ``ExampleRhiWidget``, a ``QRhiWidget`` subclass, is added
+to a top-level widget's child hierarchy, the corresponding window automatically
+becomes a Direct 3D, Vulkan, Metal, or OpenGL-rendered window. The
+``QPainter``-rendered widget content, i.e. everything that is not a
+``QRhiWidget``, ``QOpenGLWidget``, or ``QQuickWidget``, is then uploaded to a
+texture, whereas the mentioned special widgets each render to a texture. The
+resulting set textures is composited together by the top-level widget's
+backingstore.
+
+As opposed to the C++ example, the cleanup is done by reimplementing
+``QRhiWidget.releaseResources()``, which is called from QWidget.closeEvent() of
+the top level widget to ensure a deterministic cleanup sequence.
+
+.. image:: simplerhiwidget.webp
+ :width: 400
+ :alt: Screenshot of the Simple RHI Widget example
diff --git a/examples/widgets/rhi/simplerhiwidget/doc/simplerhiwidget.webp b/examples/widgets/rhi/simplerhiwidget/doc/simplerhiwidget.webp
new file mode 100644
index 000000000..fdb8d20ec
--- /dev/null
+++ b/examples/widgets/rhi/simplerhiwidget/doc/simplerhiwidget.webp
Binary files differ
diff --git a/examples/widgets/rhi/simplerhiwidget/examplewidget.py b/examples/widgets/rhi/simplerhiwidget/examplewidget.py
new file mode 100644
index 000000000..5b3e40f50
--- /dev/null
+++ b/examples/widgets/rhi/simplerhiwidget/examplewidget.py
@@ -0,0 +1,135 @@
+# Copyright (C) 2024 The Qt Company Ltd.
+# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+import numpy
+
+from PySide6.QtCore import (QFile, QIODevice)
+from PySide6.QtGui import (QColor, QMatrix4x4)
+from PySide6.QtGui import (QRhiBuffer,
+ QRhiDepthStencilClearValue,
+ QRhiShaderResourceBinding,
+ QRhiShaderStage,
+ QRhiVertexInputAttribute, QRhiVertexInputBinding,
+ QRhiVertexInputLayout, QRhiViewport,
+ QShader)
+from PySide6.QtWidgets import QRhiWidget
+from PySide6.support import VoidPtr
+
+VERTEX_DATA = numpy.array([ 0.0, 0.5, 1.0, 0.0, 0.0, # noqa E:201
+ -0.5, -0.5, 0.0, 1.0, 0.0, # noqa E:241
+ 0.5, -0.5, 0.0, 0.0, 1.0],
+ dtype=numpy.float32)
+
+
+def getShader(name):
+ f = QFile(name)
+ if f.open(QIODevice.ReadOnly):
+ return QShader.fromSerialized(f.readAll())
+ return QShader()
+
+
+class ExampleRhiWidget(QRhiWidget):
+
+ def __init__(self, parent=None):
+ super().__init__(parent)
+ self.m_rhi = None
+ self.m_vbuf = None
+ self.m_ubuf = None
+ self.m_srb = None
+ self.m_pipeline = None
+ self.m_viewProjection = QMatrix4x4()
+ self.m_rotation = 0.0
+
+ def releaseResources(self):
+ self.m_pipeline.destroy()
+ del self.m_pipeline
+ self.m_pipeline = None
+ self.m_srb.destroy()
+ del self.m_srb
+ self.m_srb = None
+ self.m_ubuf.destroy()
+ del self.m_ubuf
+ self.m_ubuf = None
+ self.m_vbuf.destroy()
+ del self.m_vbuf
+ self.m_buf = None
+
+ def initialize(self, cb):
+ if self.m_rhi != self.rhi():
+ self.m_pipeline = None
+ self.m_rhi = self.rhi()
+
+ if not self.m_pipeline:
+ vertex_size = 4 * VERTEX_DATA.size
+ self.m_vbuf = self.m_rhi.newBuffer(QRhiBuffer.Immutable,
+ QRhiBuffer.VertexBuffer, vertex_size)
+ self.m_vbuf.create()
+
+ self.m_ubuf = self.m_rhi.newBuffer(QRhiBuffer.Dynamic,
+ QRhiBuffer.UniformBuffer, 64)
+ self.m_ubuf.create()
+
+ self.m_srb = self.m_rhi.newShaderResourceBindings()
+ bindings = [
+ QRhiShaderResourceBinding.uniformBuffer(0, QRhiShaderResourceBinding.VertexStage,
+ self.m_ubuf)
+ ]
+ self.m_srb.setBindings(bindings)
+ self.m_srb.create()
+
+ self.m_pipeline = self.m_rhi.newGraphicsPipeline()
+ stages = [
+ QRhiShaderStage(QRhiShaderStage.Vertex,
+ getShader(":/shader_assets/color.vert.qsb")),
+ QRhiShaderStage(QRhiShaderStage.Fragment,
+ getShader(":/shader_assets/color.frag.qsb"))
+ ]
+ self.m_pipeline.setShaderStages(stages)
+ inputLayout = QRhiVertexInputLayout()
+ input_bindings = [QRhiVertexInputBinding(5 * 4)] # sizeof(float)
+ inputLayout.setBindings(input_bindings)
+ attributes = [ # 4: sizeof(float)
+ QRhiVertexInputAttribute(0, 0, QRhiVertexInputAttribute.Float2, 0),
+ QRhiVertexInputAttribute(0, 1, QRhiVertexInputAttribute.Float3, 2 * 4)
+ ]
+ inputLayout.setAttributes(attributes)
+ self.m_pipeline.setVertexInputLayout(inputLayout)
+ self.m_pipeline.setShaderResourceBindings(self.m_srb)
+ self.m_pipeline.setRenderPassDescriptor(self.renderTarget().renderPassDescriptor())
+ self.m_pipeline.create()
+
+ resourceUpdates = self.m_rhi.nextResourceUpdateBatch()
+ resourceUpdates.uploadStaticBuffer(self.m_vbuf, VoidPtr(VERTEX_DATA.tobytes(),
+ vertex_size))
+ cb.resourceUpdate(resourceUpdates)
+
+ outputSize = self.renderTarget().pixelSize()
+ self.m_viewProjection = self.m_rhi.clipSpaceCorrMatrix()
+ r = float(outputSize.width()) / float(outputSize.height())
+ self.m_viewProjection.perspective(45.0, r, 0.01, 1000.0)
+ self.m_viewProjection.translate(0, 0, -4)
+
+ def render(self, cb):
+ resourceUpdates = self.m_rhi.nextResourceUpdateBatch()
+ self.m_rotation += 1.0
+ modelViewProjection = self.m_viewProjection
+ modelViewProjection.rotate(self.m_rotation, 0, 1, 0)
+ projection = numpy.array(modelViewProjection.data(),
+ dtype=numpy.float32)
+ resourceUpdates.updateDynamicBuffer(self.m_ubuf, 0, 64,
+ projection.tobytes())
+ clearColor = QColor.fromRgbF(0.4, 0.7, 0.0, 1.0)
+ cv = QRhiDepthStencilClearValue(1.0, 0)
+ cb.beginPass(self.renderTarget(), clearColor, cv, resourceUpdates)
+
+ cb.setGraphicsPipeline(self.m_pipeline)
+ outputSize = self.renderTarget().pixelSize()
+ cb.setViewport(QRhiViewport(0, 0, outputSize.width(),
+ outputSize.height()))
+ cb.setShaderResources()
+ vbufBinding = (self.m_vbuf, 0)
+ cb.setVertexInput(0, [vbufBinding])
+ cb.draw(3)
+ cb.endPass()
+
+ self.update()
diff --git a/examples/widgets/rhi/simplerhiwidget/main.py b/examples/widgets/rhi/simplerhiwidget/main.py
new file mode 100644
index 000000000..59be81ddc
--- /dev/null
+++ b/examples/widgets/rhi/simplerhiwidget/main.py
@@ -0,0 +1,35 @@
+# Copyright (C) 2024 The Qt Company Ltd.
+# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+"""PySide6 port of the Qt Simple RHI Widget Example example from Qt v6.x"""
+
+import sys
+
+from PySide6.QtWidgets import QApplication, QVBoxLayout, QWidget
+
+from examplewidget import ExampleRhiWidget
+import rc_simplerhiwidget # noqa F:401
+
+
+class Widget(QWidget):
+
+ def __init__(self, parent=None):
+ super().__init__(parent)
+ layout = QVBoxLayout(self)
+ self._rhi_widget = ExampleRhiWidget(self)
+ layout.addWidget(self._rhi_widget)
+
+ def closeEvent(self, e):
+ self._rhi_widget.releaseResources()
+ e.accept()
+
+
+if __name__ == "__main__":
+ app = QApplication(sys.argv)
+
+ w = Widget()
+ w.resize(1280, 720)
+ w.show()
+ exit_code = app.exec()
+ del w
+ sys.exit(exit_code)
diff --git a/examples/widgets/rhi/simplerhiwidget/rc_simplerhiwidget.py b/examples/widgets/rhi/simplerhiwidget/rc_simplerhiwidget.py
new file mode 100644
index 000000000..ee8b41242
--- /dev/null
+++ b/examples/widgets/rhi/simplerhiwidget/rc_simplerhiwidget.py
@@ -0,0 +1,163 @@
+# Resource object code (Python 3)
+# Created by: object code
+# Created by: The Resource Compiler for Qt version 6.7.0
+# WARNING! All changes made in this file will be lost!
+
+from PySide6 import QtCore
+
+qt_resource_data = b"\
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+\x8dz\x9d\xd3\xd3\x0b[k0\xd0'\x80Ns\xf1\xfd\
+\xe8\x82K1\x18\xe4\xafj\xbb\x02\xa0o\x86\xe9\xb2\xdb\
+\xd1\xe1\xf1\x88\xbd\xf3\x22}\xb5jk8\xeecl\xdd\
+!\xa7\xa7\xf7 X\x04b$I\xf9\x18\xfb\x15\xec\xea\
+\xcd\x91\xc0\x9d\xfc\x0d\xd5\x01q\x1e\xf2W3\x95R\x5c\
+:g?2{2\x9e\xeb\x97\xe2\x01\x04\xcfroR\
+W\xc4\xaa\x19\xb0\x1b\x96$&=\x8a\x95\x871\xff\xad\
+\xce\xe8\xbf\x83J\xcb\xcc\xd9\xb5\xae\xea'\xc7\xdf%\xe1\
+\xb4\xa2\
+"
+
+qt_resource_name = b"\
+\x00\x0d\
+\x06E\xc5\xd3\
+\x00s\
+\x00h\x00a\x00d\x00e\x00r\x00_\x00a\x00s\x00s\x00e\x00t\x00s\
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+\x00c\
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+\x00\x0e\
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+\x00c\
+\x00o\x00l\x00o\x00r\x00.\x00v\x00e\x00r\x00t\x00.\x00q\x00s\x00b\
+"
+
+qt_resource_struct = b"\
+\x00\x00\x00\x00\x00\x02\x00\x00\x00\x01\x00\x00\x00\x01\
+\x00\x00\x00\x00\x00\x00\x00\x00\
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+\x00\x00\x01\x8a!\x0c\xa5\xeb\
+"
+
+def qInitResources():
+ QtCore.qRegisterResourceData(0x03, qt_resource_struct, qt_resource_name, qt_resource_data)
+
+def qCleanupResources():
+ QtCore.qUnregisterResourceData(0x03, qt_resource_struct, qt_resource_name, qt_resource_data)
+
+qInitResources()
diff --git a/examples/widgets/rhi/simplerhiwidget/shader_assets/color.frag.qsb b/examples/widgets/rhi/simplerhiwidget/shader_assets/color.frag.qsb
new file mode 100644
index 000000000..32bd2d595
--- /dev/null
+++ b/examples/widgets/rhi/simplerhiwidget/shader_assets/color.frag.qsb
Binary files differ
diff --git a/examples/widgets/rhi/simplerhiwidget/shader_assets/color.vert.qsb b/examples/widgets/rhi/simplerhiwidget/shader_assets/color.vert.qsb
new file mode 100644
index 000000000..bf97035d7
--- /dev/null
+++ b/examples/widgets/rhi/simplerhiwidget/shader_assets/color.vert.qsb
Binary files differ
diff --git a/examples/widgets/rhi/simplerhiwidget/shaders/color.frag b/examples/widgets/rhi/simplerhiwidget/shaders/color.frag
new file mode 100644
index 000000000..375587662
--- /dev/null
+++ b/examples/widgets/rhi/simplerhiwidget/shaders/color.frag
@@ -0,0 +1,10 @@
+#version 440
+
+layout(location = 0) in vec3 v_color;
+
+layout(location = 0) out vec4 fragColor;
+
+void main()
+{
+ fragColor = vec4(v_color, 1.0);
+}
diff --git a/examples/widgets/rhi/simplerhiwidget/shaders/color.vert b/examples/widgets/rhi/simplerhiwidget/shaders/color.vert
new file mode 100644
index 000000000..e876f290e
--- /dev/null
+++ b/examples/widgets/rhi/simplerhiwidget/shaders/color.vert
@@ -0,0 +1,16 @@
+#version 440
+
+layout(location = 0) in vec4 position;
+layout(location = 1) in vec3 color;
+
+layout(location = 0) out vec3 v_color;
+
+layout(std140, binding = 0) uniform buf {
+ mat4 mvp;
+};
+
+void main()
+{
+ v_color = color;
+ gl_Position = mvp * position;
+}
diff --git a/examples/widgets/rhi/simplerhiwidget/simplerhiwidget.pyproject b/examples/widgets/rhi/simplerhiwidget/simplerhiwidget.pyproject
new file mode 100644
index 000000000..ff0d62755
--- /dev/null
+++ b/examples/widgets/rhi/simplerhiwidget/simplerhiwidget.pyproject
@@ -0,0 +1,4 @@
+{
+ "files": ["main.py","examplewidget.py", "simplerhiwidget.qrc",
+ "shaders/color.frag", "shaders/color.vert"]
+}
diff --git a/examples/widgets/rhi/simplerhiwidget/simplerhiwidget.qrc b/examples/widgets/rhi/simplerhiwidget/simplerhiwidget.qrc
new file mode 100644
index 000000000..ddc6dfbe5
--- /dev/null
+++ b/examples/widgets/rhi/simplerhiwidget/simplerhiwidget.qrc
@@ -0,0 +1,6 @@
+<!DOCTYPE RCC><RCC version="1.0">
+<qresource prefix="/">
+ <file>shader_assets/color.vert.qsb</file>
+ <file>shader_assets/color.frag.qsb</file>
+</qresource>
+</RCC>