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| |
| #include "../shared/examplefw.h" |
| #include "../shared/cube.h" |
| #include <QRandomGenerator> |
| |
| // Instanced draw example. When running with OpenGL, at least 3.3 or ES 3.0 is |
| // needed. |
| |
| const int INSTANCE_COUNT = 1024; |
| |
| struct { |
| QVector<QRhiResource *> releasePool; |
| |
| QRhiBuffer *vbuf = nullptr; |
| QRhiBuffer *instBuf = nullptr; |
| QRhiBuffer *ubuf = nullptr; |
| QRhiShaderResourceBindings *srb = nullptr; |
| QRhiGraphicsPipeline *ps = nullptr; |
| |
| QRhiResourceUpdateBatch *initialUpdates = nullptr; |
| QMatrix4x4 winProj; |
| } d; |
| |
| void Window::customInit() |
| { |
| if (!m_r->isFeatureSupported(QRhi::Instancing)) |
| qFatal("Instanced drawing is not supported"); |
| |
| d.initialUpdates = m_r->nextResourceUpdateBatch(); |
| |
| d.vbuf = m_r->newBuffer(QRhiBuffer::Immutable, QRhiBuffer::VertexBuffer, sizeof(cube)); |
| d.vbuf->build(); |
| d.releasePool << d.vbuf; |
| |
| d.initialUpdates->uploadStaticBuffer(d.vbuf, cube); |
| |
| // translation + color (vec3 + vec3), interleaved, for each instance |
| d.instBuf = m_r->newBuffer(QRhiBuffer::Immutable, QRhiBuffer::VertexBuffer, INSTANCE_COUNT * 6 * sizeof(float)); |
| d.instBuf->build(); |
| d.releasePool << d.instBuf; |
| |
| d.ubuf = m_r->newBuffer(QRhiBuffer::Dynamic, QRhiBuffer::UniformBuffer, 64 + 12); |
| d.ubuf->build(); |
| d.releasePool << d.ubuf; |
| |
| d.srb = m_r->newShaderResourceBindings(); |
| d.releasePool << d.srb; |
| d.srb->setBindings({ |
| QRhiShaderResourceBinding::uniformBuffer(0, QRhiShaderResourceBinding::VertexStage, d.ubuf) |
| }); |
| d.srb->build(); |
| |
| d.ps = m_r->newGraphicsPipeline(); |
| d.releasePool << d.ps; |
| d.ps->setShaderStages({ |
| { QRhiShaderStage::Vertex, getShader(QLatin1String(":/inst.vert.qsb")) }, |
| { QRhiShaderStage::Fragment, getShader(QLatin1String(":/inst.frag.qsb")) } |
| }); |
| QRhiVertexInputLayout inputLayout; |
| inputLayout.setBindings({ |
| { 3 * sizeof(float) }, // cube vertices |
| { 6 * sizeof(float), QRhiVertexInputBinding::PerInstance } // per-instance translation and color |
| }); |
| inputLayout.setAttributes({ |
| { 0, 0, QRhiVertexInputAttribute::Float3, 0 }, // position |
| { 1, 1, QRhiVertexInputAttribute::Float3, 0 }, // instTranslate |
| { 1, 2, QRhiVertexInputAttribute::Float3, 3 * sizeof(float) } // instColor |
| }); |
| d.ps->setVertexInputLayout(inputLayout); |
| d.ps->setShaderResourceBindings(d.srb); |
| d.ps->setRenderPassDescriptor(m_rp); |
| d.ps->build(); |
| |
| QByteArray instData; |
| instData.resize(INSTANCE_COUNT * 6 * sizeof(float)); |
| float *p = reinterpret_cast<float *>(instData.data()); |
| QRandomGenerator *rgen = QRandomGenerator::global(); |
| for (int i = 0; i < INSTANCE_COUNT; ++i) { |
| // translation |
| *p++ = rgen->bounded(8000) / 100.0f - 40.0f; |
| *p++ = rgen->bounded(8000) / 100.0f - 40.0f; |
| *p++ = 0.0f; |
| // color |
| *p++ = i / float(INSTANCE_COUNT); |
| *p++ = 0.0f; |
| *p++ = 0.0f; |
| } |
| d.initialUpdates->uploadStaticBuffer(d.instBuf, instData.constData()); |
| } |
| |
| void Window::customRelease() |
| { |
| qDeleteAll(d.releasePool); |
| d.releasePool.clear(); |
| } |
| |
| void Window::customRender() |
| { |
| const QSize outputSizeInPixels = m_sc->currentPixelSize(); |
| QRhiCommandBuffer *cb = m_sc->currentFrameCommandBuffer(); |
| QRhiResourceUpdateBatch *u = m_r->nextResourceUpdateBatch(); |
| if (d.initialUpdates) { |
| u->merge(d.initialUpdates); |
| d.initialUpdates->release(); |
| d.initialUpdates = nullptr; |
| } |
| |
| if (d.winProj != m_proj) { |
| d.winProj = m_proj; |
| QMatrix4x4 mvp = m_proj; |
| mvp.scale(0.05f); |
| u->updateDynamicBuffer(d.ubuf, 0, 64, mvp.constData()); |
| } |
| |
| cb->beginPass(m_sc->currentFrameRenderTarget(), m_clearColor, { 1.0f, 0 }, u); |
| cb->setGraphicsPipeline(d.ps); |
| cb->setViewport({ 0, 0, float(outputSizeInPixels.width()), float(outputSizeInPixels.height()) }); |
| cb->setShaderResources(); |
| const QRhiCommandBuffer::VertexInput vbufBinding[] = { |
| { d.vbuf, 0 }, |
| { d.instBuf, 0 } |
| }; |
| cb->setVertexInput(0, 2, vbufBinding); |
| cb->draw(36, INSTANCE_COUNT); |
| cb->endPass(); |
| } |