diff options
Diffstat (limited to 'examples/quick/scenegraph/rhitextureitem/rhitextureitem.cpp')
-rw-r--r-- | examples/quick/scenegraph/rhitextureitem/rhitextureitem.cpp | 141 |
1 files changed, 141 insertions, 0 deletions
diff --git a/examples/quick/scenegraph/rhitextureitem/rhitextureitem.cpp b/examples/quick/scenegraph/rhitextureitem/rhitextureitem.cpp new file mode 100644 index 0000000000..2b96320869 --- /dev/null +++ b/examples/quick/scenegraph/rhitextureitem/rhitextureitem.cpp @@ -0,0 +1,141 @@ +// Copyright (C) 2023 The Qt Company Ltd. +// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause + +#include "rhitextureitem.h" +#include <QFile> + +//![0] +QQuickRhiItemRenderer *ExampleRhiItem::createRenderer() +{ + return new ExampleRhiItemRenderer; +} + +void ExampleRhiItem::setAngle(float a) +{ + if (m_angle == a) + return; + + m_angle = a; + emit angleChanged(); + update(); +} + +void ExampleRhiItem::setBackgroundAlpha(float a) +{ + if (m_alpha == a) + return; + + m_alpha = a; + emit backgroundAlphaChanged(); + update(); +} + +void ExampleRhiItemRenderer::synchronize(QQuickRhiItem *rhiItem) +{ + ExampleRhiItem *item = static_cast<ExampleRhiItem *>(rhiItem); + if (item->angle() != m_angle) + m_angle = item->angle(); + if (item->backgroundAlpha() != m_alpha) + m_alpha = item->backgroundAlpha(); +} +//![0] + +static QShader getShader(const QString &name) +{ + QFile f(name); + return f.open(QIODevice::ReadOnly) ? QShader::fromSerialized(f.readAll()) : QShader(); +} + +static float vertexData[] = { + 0.0f, 0.5f, 1.0f, 0.0f, 0.0f, + -0.5f, -0.5f, 0.0f, 1.0f, 0.0f, + 0.5f, -0.5f, 0.0f, 0.0f, 1.0f, +}; + +//![1] +void ExampleRhiItemRenderer::initialize(QRhiCommandBuffer *cb) +{ + if (m_rhi != rhi()) { + m_rhi = rhi(); + m_pipeline.reset(); + } + + if (m_sampleCount != renderTarget()->sampleCount()) { + m_sampleCount = renderTarget()->sampleCount(); + m_pipeline.reset(); + } + + QRhiTexture *finalTex = m_sampleCount > 1 ? resolveTexture() : colorTexture(); + if (m_textureFormat != finalTex->format()) { + m_textureFormat = finalTex->format(); + m_pipeline.reset(); + } +//![1] +//![2] + if (!m_pipeline) { + m_vbuf.reset(m_rhi->newBuffer(QRhiBuffer::Immutable, QRhiBuffer::VertexBuffer, sizeof(vertexData))); + m_vbuf->create(); + + m_ubuf.reset(m_rhi->newBuffer(QRhiBuffer::Dynamic, QRhiBuffer::UniformBuffer, 64)); + m_ubuf->create(); + + m_srb.reset(m_rhi->newShaderResourceBindings()); + m_srb->setBindings({ + QRhiShaderResourceBinding::uniformBuffer(0, QRhiShaderResourceBinding::VertexStage, m_ubuf.get()), + }); + m_srb->create(); + + m_pipeline.reset(m_rhi->newGraphicsPipeline()); + m_pipeline->setShaderStages({ + { QRhiShaderStage::Vertex, getShader(QLatin1String(":/scenegraph/rhitextureitem/shaders/color.vert.qsb")) }, + { QRhiShaderStage::Fragment, getShader(QLatin1String(":/scenegraph/rhitextureitem/shaders/color.frag.qsb")) } + }); + QRhiVertexInputLayout inputLayout; + inputLayout.setBindings({ + { 5 * sizeof(float) } + }); + inputLayout.setAttributes({ + { 0, 0, QRhiVertexInputAttribute::Float2, 0 }, + { 0, 1, QRhiVertexInputAttribute::Float3, 2 * sizeof(float) } + }); + m_pipeline->setSampleCount(m_sampleCount); + m_pipeline->setVertexInputLayout(inputLayout); + m_pipeline->setShaderResourceBindings(m_srb.get()); + m_pipeline->setRenderPassDescriptor(renderTarget()->renderPassDescriptor()); + m_pipeline->create(); + + QRhiResourceUpdateBatch *resourceUpdates = m_rhi->nextResourceUpdateBatch(); + resourceUpdates->uploadStaticBuffer(m_vbuf.get(), vertexData); + cb->resourceUpdate(resourceUpdates); + } + + const QSize outputSize = renderTarget()->pixelSize(); + m_viewProjection = m_rhi->clipSpaceCorrMatrix(); + m_viewProjection.perspective(45.0f, outputSize.width() / (float) outputSize.height(), 0.01f, 1000.0f); + m_viewProjection.translate(0, 0, -4); +//![2] +} + +//![3] +void ExampleRhiItemRenderer::render(QRhiCommandBuffer *cb) +{ + QRhiResourceUpdateBatch *resourceUpdates = m_rhi->nextResourceUpdateBatch(); + QMatrix4x4 modelViewProjection = m_viewProjection; + modelViewProjection.rotate(m_angle, 0, 1, 0); + resourceUpdates->updateDynamicBuffer(m_ubuf.get(), 0, 64, modelViewProjection.constData()); + + // Qt Quick expects premultiplied alpha + const QColor clearColor = QColor::fromRgbF(0.5f * m_alpha, 0.5f * m_alpha, 0.7f * m_alpha, m_alpha); + cb->beginPass(renderTarget(), clearColor, { 1.0f, 0 }, resourceUpdates); + + cb->setGraphicsPipeline(m_pipeline.get()); + const QSize outputSize = renderTarget()->pixelSize(); + cb->setViewport(QRhiViewport(0, 0, outputSize.width(), outputSize.height())); + cb->setShaderResources(); + const QRhiCommandBuffer::VertexInput vbufBinding(m_vbuf.get(), 0); + cb->setVertexInput(0, 1, &vbufBinding); + cb->draw(3); + + cb->endPass(); +} +//![3] |