Commit c18b80c5 authored by Laszlo Agocs's avatar Laszlo Agocs
Browse files

Add imgui example skeleton

parent 6dc29157
/****************************************************************************
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#include "../shared/examplefw.h"
#include <QRhiImgui>
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,
};
struct {
QVector<QRhiResource *> releasePool;
QRhiBuffer *vbuf = nullptr;
QRhiBuffer *ubuf = nullptr;
QRhiShaderResourceBindings *srb = nullptr;
QRhiGraphicsPipeline *ps = nullptr;
QRhiResourceUpdateBatch *initialUpdates = nullptr;
float rotation = 0;
QRhiImgui imgui;
} d;
void Window::customInit()
{
d.vbuf = m_r->newBuffer(QRhiBuffer::Immutable, QRhiBuffer::VertexBuffer, sizeof(vertexData));
d.vbuf->build();
d.releasePool << d.vbuf;
d.ubuf = m_r->newBuffer(QRhiBuffer::Dynamic, QRhiBuffer::UniformBuffer, 64 + 4);
d.ubuf->build();
d.releasePool << d.ubuf;
d.initialUpdates = m_r->nextResourceUpdateBatch();
d.initialUpdates->uploadStaticBuffer(d.vbuf, vertexData);
float opacity = 1.0f;
d.initialUpdates->updateDynamicBuffer(d.ubuf, 64, 4, &opacity);
d.srb = m_r->newShaderResourceBindings();
d.releasePool << d.srb;
d.srb->setBindings({
QRhiShaderResourceBinding::uniformBuffer(0, QRhiShaderResourceBinding::VertexStage | QRhiShaderResourceBinding::FragmentStage, d.ubuf),
});
d.srb->build();
d.ps = m_r->newGraphicsPipeline();
d.releasePool << d.ps;
QBakedShader vs = getShader(QLatin1String(":/color.vert.qsb"));
Q_ASSERT(vs.isValid());
QBakedShader fs = getShader(QLatin1String(":/color.frag.qsb"));
Q_ASSERT(fs.isValid());
d.ps->setShaderStages({
{ QRhiGraphicsShaderStage::Vertex, vs },
{ QRhiGraphicsShaderStage::Fragment, fs }
});
QRhiVertexInputLayout inputLayout;
inputLayout.bindings = {
{ 5 * sizeof(float) }
};
inputLayout.attributes = {
{ 0, 0, QRhiVertexInputLayout::Attribute::Float2, 0 },
{ 0, 1, QRhiVertexInputLayout::Attribute::Float3, 2 * sizeof(float) }
};
d.ps->setVertexInputLayout(inputLayout);
d.ps->setShaderResourceBindings(d.srb);
d.ps->setRenderPassDescriptor(m_rp);
d.ps->build();
}
void Window::customRelease()
{
for (QRhiResource *r : d.releasePool)
r->releaseAndDestroy();
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;
}
QMatrix4x4 mvp = m_proj;
d.rotation += 1;
mvp.rotate(d.rotation, 0, 1, 0);
u->updateDynamicBuffer(d.ubuf, 0, 64, mvp.constData());
cb->beginPass(m_sc->currentFrameRenderTarget(), { 0.4f, 0.7f, 0.0f, 1.0f }, { 1.0f, 0 }, u);
cb->setGraphicsPipeline(d.ps);
cb->setViewport(QRhiViewport(0, 0, outputSizeInPixels.width(), outputSizeInPixels.height()));
cb->setVertexInput(0, { { d.vbuf, 0 } });
cb->draw(36);
cb->endPass();
}
TEMPLATE = app
QT += shadertools rhi
SOURCES = \
imguidemo.cpp
RESOURCES = \
imguidemo.qrc
target.path = $$[QT_INSTALL_EXAMPLES]/rhi/imguidemo
INSTALLS += target
<!DOCTYPE RCC><RCC version="1.0">
<qresource>
<file alias="color.vert.qsb">../shared/color.vert.qsb</file>
<file alias="color.frag.qsb">../shared/color.frag.qsb</file>
</qresource>
</RCC>
......@@ -10,6 +10,7 @@ SUBDIRS += \
cubemap \
multiwindow \
multiwindow_threaded \
imguidemo \
plainqwindow_gles2 \
offscreen_gles2
......
......@@ -48,4 +48,14 @@ QRhiImgui::~QRhiImgui()
delete d;
}
QRhiImguiPrivate::QRhiImguiPrivate()
{
ImGui::CreateContext();
}
QRhiImguiPrivate::~QRhiImguiPrivate()
{
ImGui::DestroyContext();
}
QT_END_NAMESPACE
......@@ -44,11 +44,15 @@
#include "qtrhiglobal_p.h"
#include "qrhiimgui.h"
#include "imgui.h"
QT_BEGIN_NAMESPACE
class QRhiImguiPrivate
{
public:
QRhiImguiPrivate();
~QRhiImguiPrivate();
};
QT_END_NAMESPACE
......
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