qt/qtquick3d/src/runtimerender/qssgrenderreflectionmap.cpp

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// Copyright (C) 2021 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
// Qt-Security score:significant reason:default
#include <QtQuick3DRuntimeRender/private/qssgrenderreflectionprobe_p.h>
#include <QtQuick3DRuntimeRender/private/qssgrenderlayer_p.h>
#include <QtQuick3DRuntimeRender/private/qssglayerrenderdata_p.h>
#include "qssgrendercontextcore.h"
QT_BEGIN_NAMESPACE
const int prefilterSampleCount = 16;
QSSGRenderReflectionMap::QSSGRenderReflectionMap(const QSSGRenderContextInterface &inContext)
: m_context(inContext)
{
}
QSSGRenderReflectionMap::~QSSGRenderReflectionMap()
{
releaseCachedResources();
}
void QSSGRenderReflectionMap::releaseCachedResources()
{
for (QSSGReflectionMapEntry &entry : m_reflectionMapList)
entry.destroyRhiResources();
m_reflectionMapList.clear();
}
static QRhiTexture *allocateRhiReflectionTexture(QRhi *rhi,
QRhiTexture::Format format,
const QSize &size,
QRhiTexture::Flags flags = {})
{
auto texture = rhi->newTexture(format, size, 1, flags);
if (!texture->create())
qWarning("Failed to create reflection map texture of size %dx%d", size.width(), size.height());
return texture;
}
static QRhiRenderBuffer *allocateRhiReflectionRenderBuffer(QRhi *rhi,
QRhiRenderBuffer::Type type,
const QSize &size)
{
auto renderBuffer = rhi->newRenderBuffer(type, size, 1);
if (!renderBuffer->create())
qWarning("Failed to build depth-stencil buffer of size %dx%d", size.width(), size.height());
return renderBuffer;
}
void QSSGRenderReflectionMap::addReflectionMapEntry(qint32 probeIdx, const QSSGRenderReflectionProbe &probe)
{
QRhi *rhi = m_context.rhiContext()->rhi();
// Bail out if there is no QRhi, since we can't add entries without it
if (!rhi)
return;
QRhiTexture::Format rhiFormat = QRhiTexture::RGBA16F;
const QByteArray rtName = probe.debugObjectName.toLatin1();
const int mapRes = 1 << probe.reflectionMapRes;
QSize pixelSize(mapRes, mapRes);
QSSGReflectionMapEntry *pEntry = reflectionMapEntry(probeIdx);
if (!pEntry) {
QRhiRenderBuffer *depthStencil = allocateRhiReflectionRenderBuffer(rhi, QRhiRenderBuffer::DepthStencil, pixelSize);
QRhiTexture *map = allocateRhiReflectionTexture(rhi, rhiFormat, pixelSize, QRhiTexture::RenderTarget | QRhiTexture::CubeMap
| QRhiTexture::MipMapped | QRhiTexture::UsedWithGenerateMips);
QRhiTexture *prefiltered = allocateRhiReflectionTexture(rhi, rhiFormat, pixelSize, QRhiTexture::RenderTarget | QRhiTexture::CubeMap
| QRhiTexture::MipMapped | QRhiTexture::UsedWithGenerateMips);
m_reflectionMapList.push_back(QSSGReflectionMapEntry::withRhiCubeMap(probeIdx, map, prefiltered, depthStencil));
pEntry = &m_reflectionMapList.back();
}
if (pEntry) {
pEntry->m_needsRender = true;
if (probe.hasScheduledUpdate)
pEntry->m_rendered = false;
if (!pEntry->m_rhiDepthStencil || mapRes != pEntry->m_rhiCube->pixelSize().width()) {
pEntry->destroyRhiResources();
pEntry->m_rhiDepthStencil = allocateRhiReflectionRenderBuffer(rhi, QRhiRenderBuffer::DepthStencil, pixelSize);
pEntry->m_rhiCube = allocateRhiReflectionTexture(rhi, rhiFormat, pixelSize, QRhiTexture::RenderTarget | QRhiTexture::CubeMap
| QRhiTexture::MipMapped | QRhiTexture::UsedWithGenerateMips);
pEntry->m_rhiPrefilteredCube = allocateRhiReflectionTexture(rhi, rhiFormat, pixelSize, QRhiTexture::RenderTarget | QRhiTexture::CubeMap
| QRhiTexture::MipMapped | QRhiTexture::UsedWithGenerateMips);
}
// Additional graphics resources: samplers, render targets.
if (pEntry->m_rhiRenderTargets.isEmpty()) {
pEntry->m_rhiRenderTargets.resize(6);
for (int i = 0; i < 6; ++i)
pEntry->m_rhiRenderTargets[i] = nullptr;
}
Q_ASSERT(pEntry->m_rhiRenderTargets.size() == 6);
if (pEntry->m_skyBoxSrbs.isEmpty()) {
pEntry->m_skyBoxSrbs.resize(6);
for (int i = 0; i < 6; ++i)
pEntry->m_skyBoxSrbs[i] = nullptr;
}
for (const auto face : QSSGRenderTextureCubeFaces) {
QRhiTextureRenderTarget *&rt(pEntry->m_rhiRenderTargets[quint8(face)]);
if (!rt) {
QRhiColorAttachment att(pEntry->m_rhiCube);
att.setLayer(quint8(face)); // 6 render targets, each referencing one face of the cubemap
QRhiTextureRenderTargetDescription rtDesc;
rtDesc.setColorAttachments({ att });
rtDesc.setDepthStencilBuffer(pEntry->m_rhiDepthStencil);
rt = rhi->newTextureRenderTarget(rtDesc);
rt->setDescription(rtDesc);
if (!pEntry->m_rhiRenderPassDesc)
pEntry->m_rhiRenderPassDesc = rt->newCompatibleRenderPassDescriptor();
rt->setRenderPassDescriptor(pEntry->m_rhiRenderPassDesc);
if (!rt->create())
qWarning("Failed to build reflection map render target");
}
rt->setName(rtName + QByteArrayLiteral(" reflection cube face: ") + QSSGBaseTypeHelpers::displayName(face));
}
if (!pEntry->m_prefilterPipeline) {
const QSize mapSize = pEntry->m_rhiCube->pixelSize();
int mipmapCount = rhi->mipLevelsForSize(mapSize);
mipmapCount = qMin(mipmapCount, 6); // don't create more than 6 mip levels
// Create a renderbuffer for each mip level
for (int mipLevel = 0; mipLevel < mipmapCount; ++mipLevel) {
const QSize levelSize = QSize(mapSize.width() * std::pow(0.5, mipLevel),
mapSize.height() * std::pow(0.5, mipLevel));
pEntry->m_prefilterMipLevelSizes.insert(mipLevel, levelSize);
// Setup Render targets (6 * mipmapCount)
QVarLengthArray<QRhiTextureRenderTarget *, 6> renderTargets;
for (const auto face : QSSGRenderTextureCubeFaces) {
QRhiColorAttachment att(pEntry->m_rhiPrefilteredCube);
att.setLayer(quint8(face));
att.setLevel(mipLevel);
QRhiTextureRenderTargetDescription rtDesc;
rtDesc.setColorAttachments({att});
auto renderTarget = rhi->newTextureRenderTarget(rtDesc);
renderTarget->setName(rtName + QByteArrayLiteral(" reflection prefilter mip/face ")
+ QByteArray::number(mipLevel) + QByteArrayLiteral("/") + QSSGBaseTypeHelpers::displayName(face));
renderTarget->setDescription(rtDesc);
if (!pEntry->m_rhiPrefilterRenderPassDesc)
pEntry->m_rhiPrefilterRenderPassDesc = renderTarget->newCompatibleRenderPassDescriptor();
renderTarget->setRenderPassDescriptor(pEntry->m_rhiPrefilterRenderPassDesc);
if (!renderTarget->create())
qWarning("Failed to build prefilter cube map render target");
renderTargets << renderTarget;
}
pEntry->m_rhiPrefilterRenderTargetsMap.insert(mipLevel, renderTargets);
}
const auto &prefilterShaderStages = m_context.shaderCache()->getBuiltInRhiShaders().getRhiReflectionprobePreFilterShader();
const QSSGRhiSamplerDescription samplerMipMapDesc {
QRhiSampler::Linear,
QRhiSampler::Linear,
QRhiSampler::Linear,
QRhiSampler::ClampToEdge,
QRhiSampler::ClampToEdge,
QRhiSampler::Repeat
};
QRhiSampler *cubeSampler = m_context.rhiContext()->sampler(samplerMipMapDesc);
QRhiVertexInputLayout inputLayout;
inputLayout.setBindings({
{ 3 * sizeof(float) }
});
inputLayout.setAttributes({
{ 0, 0, QRhiVertexInputAttribute::Float3, 0 }
});
int ubufElementSize = rhi->ubufAligned(128);
pEntry->m_prefilterVertBuffer = rhi->newBuffer(QRhiBuffer::Dynamic, QRhiBuffer::UniformBuffer, ubufElementSize * 6);
pEntry->m_prefilterVertBuffer->create();
const int uBufSamplesSize = 16 * prefilterSampleCount + 8;
int uBufSamplesElementSize = rhi->ubufAligned(uBufSamplesSize);
pEntry->m_prefilterFragBuffer = rhi->newBuffer(QRhiBuffer::Dynamic, QRhiBuffer::UniformBuffer, uBufSamplesElementSize * mipmapCount);
pEntry->m_prefilterFragBuffer->create();
pEntry->m_prefilterPipeline = rhi->newGraphicsPipeline();
pEntry->m_prefilterPipeline->setCullMode(QRhiGraphicsPipeline::Front);
pEntry->m_prefilterPipeline->setFrontFace(QRhiGraphicsPipeline::CCW);
pEntry->m_prefilterPipeline->setDepthOp(QRhiGraphicsPipeline::LessOrEqual);
pEntry->m_prefilterPipeline->setShaderStages({
*prefilterShaderStages->vertexStage(),
*prefilterShaderStages->fragmentStage()
});
pEntry->m_prefilterSrb = rhi->newShaderResourceBindings();
pEntry->m_prefilterSrb->setBindings({
QRhiShaderResourceBinding::uniformBufferWithDynamicOffset(0, QRhiShaderResourceBinding::VertexStage, pEntry->m_prefilterVertBuffer, 128),
QRhiShaderResourceBinding::uniformBufferWithDynamicOffset(2, QRhiShaderResourceBinding::FragmentStage, pEntry->m_prefilterFragBuffer, uBufSamplesSize),
QRhiShaderResourceBinding::sampledTexture(1, QRhiShaderResourceBinding::FragmentStage, pEntry->m_rhiCube, cubeSampler)
});
pEntry->m_prefilterSrb->create();
pEntry->m_prefilterPipeline->setVertexInputLayout(inputLayout);
pEntry->m_prefilterPipeline->setShaderResourceBindings(pEntry->m_prefilterSrb);
pEntry->m_prefilterPipeline->setRenderPassDescriptor(pEntry->m_rhiPrefilterRenderPassDesc);
if (!pEntry->m_prefilterPipeline->create())
qWarning("failed to create pre-filter reflection map pipeline state");
const auto &irradianceShaderStages = m_context.shaderCache()->getBuiltInRhiShaders().getRhienvironmentmapPreFilterShader(false /* isRGBE */);
pEntry->m_irradiancePipeline = rhi->newGraphicsPipeline();
pEntry->m_irradiancePipeline->setCullMode(QRhiGraphicsPipeline::Front);
pEntry->m_irradiancePipeline->setFrontFace(QRhiGraphicsPipeline::CCW);
pEntry->m_irradiancePipeline->setDepthOp(QRhiGraphicsPipeline::LessOrEqual);
pEntry->m_irradiancePipeline->setShaderStages({
*irradianceShaderStages->vertexStage(),
*irradianceShaderStages->fragmentStage()
});
int ubufIrradianceSize = rhi->ubufAligned(20);
pEntry->m_irradianceFragBuffer = rhi->newBuffer(QRhiBuffer::Dynamic, QRhiBuffer::UniformBuffer, ubufIrradianceSize);
pEntry->m_irradianceFragBuffer->create();
pEntry->m_irradianceSrb = rhi->newShaderResourceBindings();
pEntry->m_irradianceSrb->setBindings({
QRhiShaderResourceBinding::uniformBufferWithDynamicOffset(0, QRhiShaderResourceBinding::VertexStage, pEntry->m_prefilterVertBuffer, 128),
QRhiShaderResourceBinding::uniformBufferWithDynamicOffset(2, QRhiShaderResourceBinding::FragmentStage, pEntry->m_irradianceFragBuffer, 20),
QRhiShaderResourceBinding::sampledTexture(1, QRhiShaderResourceBinding::FragmentStage, pEntry->m_rhiCube, cubeSampler)
});
pEntry->m_irradianceSrb->create();
pEntry->m_irradiancePipeline->setShaderResourceBindings(pEntry->m_irradianceSrb);
pEntry->m_irradiancePipeline->setVertexInputLayout(inputLayout);
pEntry->m_irradiancePipeline->setRenderPassDescriptor(pEntry->m_rhiPrefilterRenderPassDesc);
if (!pEntry->m_irradiancePipeline->create())
qWarning("failed to create irradiance reflection map pipeline state");
}
pEntry->m_timeSlicing = probe.timeSlicing;
pEntry->m_probeIndex = probeIdx;
Q_QUICK3D_PROFILE_ASSIGN_ID(&probe, pEntry);
}
}
void QSSGRenderReflectionMap::addTexturedReflectionMapEntry(qint32 probeIdx, const QSSGRenderReflectionProbe &probe)
{
QSSGReflectionMapEntry *pEntry = reflectionMapEntry(probeIdx);
const QSSGRenderImageTexture probeTexture = m_context.bufferManager()->loadRenderImage(probe.texture, QSSGBufferManager::MipModeFollowRenderImage);
if (!pEntry) {
if (probeTexture.m_texture)
m_reflectionMapList.push_back(QSSGReflectionMapEntry::withRhiTexturedCubeMap(probeIdx, probeTexture.m_texture));
else
addReflectionMapEntry(probeIdx, probe);
} else {
if (pEntry->m_rhiDepthStencil)
pEntry->destroyRhiResources();
if (probeTexture.m_texture)
pEntry->m_rhiPrefilteredCube = probeTexture.m_texture;
}
}
QSSGReflectionMapEntry *QSSGRenderReflectionMap::reflectionMapEntry(int probeIdx)
{
Q_ASSERT(probeIdx >= 0);
for (int i = 0; i < m_reflectionMapList.size(); i++) {
QSSGReflectionMapEntry *pEntry = &m_reflectionMapList[i];
if (pEntry->m_probeIndex == quint32(probeIdx))
return pEntry;
}
return nullptr;
}
QSSGReflectionMapEntry::QSSGReflectionMapEntry()
: m_probeIndex(std::numeric_limits<quint32>::max())
{
}
// Vertex data for rendering reflection cube map
static const float cube[] = {
-1.0f,-1.0f,-1.0f, // -X side
-1.0f,-1.0f, 1.0f,
-1.0f, 1.0f, 1.0f,
-1.0f, 1.0f, 1.0f,
-1.0f, 1.0f,-1.0f,
-1.0f,-1.0f,-1.0f,
-1.0f,-1.0f,-1.0f, // -Z side
1.0f, 1.0f,-1.0f,
1.0f,-1.0f,-1.0f,
-1.0f,-1.0f,-1.0f,
-1.0f, 1.0f,-1.0f,
1.0f, 1.0f,-1.0f,
-1.0f,-1.0f,-1.0f, // -Y side
1.0f,-1.0f,-1.0f,
1.0f,-1.0f, 1.0f,
-1.0f,-1.0f,-1.0f,
1.0f,-1.0f, 1.0f,
-1.0f,-1.0f, 1.0f,
-1.0f, 1.0f,-1.0f, // +Y side
-1.0f, 1.0f, 1.0f,
1.0f, 1.0f, 1.0f,
-1.0f, 1.0f,-1.0f,
1.0f, 1.0f, 1.0f,
1.0f, 1.0f,-1.0f,
1.0f, 1.0f,-1.0f, // +X side
1.0f, 1.0f, 1.0f,
1.0f,-1.0f, 1.0f,
1.0f,-1.0f, 1.0f,
1.0f,-1.0f,-1.0f,
1.0f, 1.0f,-1.0f,
-1.0f, 1.0f, 1.0f, // +Z side
-1.0f,-1.0f, 1.0f,
1.0f, 1.0f, 1.0f,
-1.0f,-1.0f, 1.0f,
1.0f,-1.0f, 1.0f,
1.0f, 1.0f, 1.0f,
0.0f, 1.0f, // -X side
1.0f, 1.0f,
1.0f, 0.0f,
1.0f, 0.0f,
0.0f, 0.0f,
0.0f, 1.0f,
1.0f, 1.0f, // -Z side
0.0f, 0.0f,
0.0f, 1.0f,
1.0f, 1.0f,
1.0f, 0.0f,
0.0f, 0.0f,
1.0f, 0.0f, // -Y side
1.0f, 1.0f,
0.0f, 1.0f,
1.0f, 0.0f,
0.0f, 1.0f,
0.0f, 0.0f,
1.0f, 0.0f, // +Y side
0.0f, 0.0f,
0.0f, 1.0f,
1.0f, 0.0f,
0.0f, 1.0f,
1.0f, 1.0f,
1.0f, 0.0f, // +X side
0.0f, 0.0f,
0.0f, 1.0f,
0.0f, 1.0f,
1.0f, 1.0f,
1.0f, 0.0f,
0.0f, 0.0f, // +Z side
0.0f, 1.0f,
1.0f, 0.0f,
0.0f, 1.0f,
1.0f, 1.0f,
1.0f, 0.0f,
};
float radicalInverseVdC(uint bits)
{
bits = (bits << 16u) | (bits >> 16u);
bits = ((bits & 0x55555555u) << 1u) | ((bits & 0xAAAAAAAAu) >> 1u);
bits = ((bits & 0x33333333u) << 2u) | ((bits & 0xCCCCCCCCu) >> 2u);
bits = ((bits & 0x0F0F0F0Fu) << 4u) | ((bits & 0xF0F0F0F0u) >> 4u);
bits = ((bits & 0x00FF00FFu) << 8u) | ((bits & 0xFF00FF00u) >> 8u);
return float(bits) * 2.3283064365386963e-10; // / 0x100000000
}
QVector2D hammersley(uint i, uint N)
{
return QVector2D(float(i) / float(N), radicalInverseVdC(i));
}
QVector3D importanceSampleGGX(QVector2D xi, float roughness)
{
float a = roughness*roughness;
float phi = 2.0f * M_PI * xi.x();
float cosTheta = sqrt((1.0f - xi.y()) / (1.0f + (a*a - 1.0f) * xi.y()));
float sinTheta = sqrt(1.0f - cosTheta * cosTheta);
// from spherical coordinates to cartesian coordinates
return QVector3D(cos(phi) * sinTheta, sin(phi) * sinTheta, cosTheta);
}
float distributionGGX(float nDotH, float roughness)
{
float a = roughness * roughness;
float a2 = a * a;
float nDotH2 = nDotH * nDotH;
float nom = a2;
float denom = nDotH2 * (a2 - 1.0f) + 1.0f;
denom = M_PI * denom * denom;
return nom / denom;
}
void fillPrefilterValues(float roughness, float resolution,
QVarLengthArray<QVector4D, prefilterSampleCount> &sampleDirections,
float &invTotalWeight, uint &sampleCount)
{
for (int i = 0; i < prefilterSampleCount * 8; ++i) {
const QVector2D xi = hammersley(i, prefilterSampleCount);
const QVector3D half = importanceSampleGGX(xi, roughness);
QVector3D light = 2.0f * half.z() * half - QVector3D(0, 0, 1);
light.normalize();
const float D = distributionGGX(half.z(), roughness);
const float pdf = D * half.z() / (4.0f * half.z()) + 0.0001f;
const float saTexel = 4.0f * M_PI / (6.0f * resolution * resolution);
const float saSample = 1.0f / (float(prefilterSampleCount) * pdf + 0.0001f);
float mipLevel = roughness == 0.0f ? 0.0f : 0.5f * log2(saSample / saTexel);
if (light.z() > 0) {
sampleDirections.append(QVector4D(light, mipLevel));
invTotalWeight += light.z();
sampleCount++;
if (sampleCount >= prefilterSampleCount)
break;
}
}
invTotalWeight = 1.0f / invTotalWeight;
}
void QSSGReflectionMapEntry::renderMips(QSSGRhiContext *rhiCtx)
{
auto *rhi = rhiCtx->rhi();
auto *cb = rhiCtx->commandBuffer();
auto *rub = rhi->nextResourceUpdateBatch();
rub->generateMips(m_rhiCube);
QRhiBuffer *vertexBuffer = rhi->newBuffer(QRhiBuffer::Immutable, QRhiBuffer::VertexBuffer, sizeof(cube));
vertexBuffer->create();
vertexBuffer->deleteLater();
rub->uploadStaticBuffer(vertexBuffer, cube);
cb->resourceUpdate(rub);
const QRhiCommandBuffer::VertexInput vbufBinding(vertexBuffer, 0);
int ubufElementSize = rhi->ubufAligned(128);
const int uBufSamplesSize = 16 * prefilterSampleCount + 8;
int uBufSamplesElementSize = rhi->ubufAligned(uBufSamplesSize);
int uBufIrradianceElementSize = rhi->ubufAligned(20);
// Uniform Data
QMatrix4x4 mvp = rhi->clipSpaceCorrMatrix();
mvp.perspective(90.0f, 1.0f, 0.1f, 10.0f);
auto lookAt = [](const QVector3D &eye, const QVector3D &center, const QVector3D &up) {
QMatrix4x4 viewMatrix;
viewMatrix.lookAt(eye, center, up);
return viewMatrix;
};
QVarLengthArray<QMatrix4x4, 6> views;
views.append(lookAt(QVector3D(0.0f, 0.0f, 0.0f), QVector3D(1.0, 0.0, 0.0), QVector3D(0.0f, -1.0f, 0.0f)));
views.append(lookAt(QVector3D(0.0f, 0.0f, 0.0f), QVector3D(-1.0, 0.0, 0.0), QVector3D(0.0f, -1.0f, 0.0f)));
if (rhi->isYUpInFramebuffer()) {
views.append(lookAt(QVector3D(0.0f, 0.0f, 0.0f), QVector3D(0.0, 1.0, 0.0), QVector3D(0.0f, 0.0f, 1.0f)));
views.append(lookAt(QVector3D(0.0f, 0.0f, 0.0f), QVector3D(0.0, -1.0, 0.0), QVector3D(0.0f, 0.0f, -1.0f)));
} else {
views.append(lookAt(QVector3D(0.0f, 0.0f, 0.0f), QVector3D(0.0, -1.0, 0.0), QVector3D(0.0f, 0.0f, -1.0f)));
views.append(lookAt(QVector3D(0.0f, 0.0f, 0.0f), QVector3D(0.0, 1.0, 0.0), QVector3D(0.0f, 0.0f, 1.0f)));
}
views.append(lookAt(QVector3D(0.0f, 0.0f, 0.0f), QVector3D(0.0, 0.0, 1.0), QVector3D(0.0f, -1.0f, 0.0f)));
views.append(lookAt(QVector3D(0.0f, 0.0f, 0.0f), QVector3D(0.0, 0.0, -1.0), QVector3D(0.0f, -1.0f, 0.0f)));
rub = rhi->nextResourceUpdateBatch();
for (const auto face : QSSGRenderTextureCubeFaces) {
rub->updateDynamicBuffer(m_prefilterVertBuffer, quint8(face) * ubufElementSize, 64, mvp.constData());
rub->updateDynamicBuffer(m_prefilterVertBuffer, quint8(face) * ubufElementSize + 64, 64, views[quint8(face)].constData());
}
const QSize mapSize = m_rhiCube->pixelSize();
int mipmapCount = rhi->mipLevelsForSize(mapSize);
mipmapCount = qMin(mipmapCount, 6);
const float resolution = mapSize.width();
QVarLengthArray<QVector4D, prefilterSampleCount> sampleDirections;
// set the samples uniform buffer data
for (int mipLevel = 0; mipLevel < mipmapCount - 1; ++mipLevel) {
Q_ASSERT(mipmapCount - 2);
const float roughness = float(mipLevel) / float(mipmapCount - 2);
float invTotalWeight = 0.0f;
uint sampleCount = 0;
sampleDirections.clear();
fillPrefilterValues(roughness, resolution, sampleDirections, invTotalWeight, sampleCount);
rub->updateDynamicBuffer(m_prefilterFragBuffer, mipLevel * uBufSamplesElementSize, 16 * prefilterSampleCount, sampleDirections.constData());
rub->updateDynamicBuffer(m_prefilterFragBuffer, mipLevel * uBufSamplesElementSize + 16 * prefilterSampleCount, 4, &invTotalWeight);
rub->updateDynamicBuffer(m_prefilterFragBuffer, mipLevel * uBufSamplesElementSize + 16 * prefilterSampleCount + 4, 4, &sampleCount);
}
{
const float roughness = 0.0f; // doesn't matter for irradiance
const float lodBias = 0.0f;
const int distribution = 0;
const int sampleCount = resolution / 4;
rub->updateDynamicBuffer(m_irradianceFragBuffer, 0, 4, &roughness);
rub->updateDynamicBuffer(m_irradianceFragBuffer, 4, 4, &resolution);
rub->updateDynamicBuffer(m_irradianceFragBuffer, 4 + 4, 4, &lodBias);
rub->updateDynamicBuffer(m_irradianceFragBuffer, 4 + 4 + 4, 4, &sampleCount);
rub->updateDynamicBuffer(m_irradianceFragBuffer, 4 + 4 + 4 + 4, 4, &distribution);
}
cb->resourceUpdate(rub);
// Render
for (int mipLevel = 0; mipLevel < mipmapCount; ++mipLevel) {
if (mipLevel > 0 && m_timeSlicing == QSSGRenderReflectionProbe::ReflectionTimeSlicing::AllFacesAtOnce)
mipLevel = m_timeSliceFrame;
for (auto face : QSSGRenderTextureCubeFaces) {
if (m_timeSlicing == QSSGRenderReflectionProbe::ReflectionTimeSlicing::IndividualFaces)
face = m_timeSliceFace;
cb->beginPass(m_rhiPrefilterRenderTargetsMap[mipLevel][quint8(face)], QColor(0, 0, 0, 1), { 1.0f, 0 }, nullptr, rhiCtx->commonPassFlags());
QSSGRHICTX_STAT(rhiCtx, beginRenderPass(m_rhiPrefilterRenderTargetsMap[mipLevel][quint8(face)]));
Q_QUICK3D_PROFILE_START(QQuick3DProfiler::Quick3DRenderPass);
if (mipLevel < mipmapCount - 1) {
// Specular pre-filtered Cube Map levels
cb->setGraphicsPipeline(m_prefilterPipeline);
cb->setVertexInput(0, 1, &vbufBinding);
cb->setViewport(QRhiViewport(0, 0, m_prefilterMipLevelSizes[mipLevel].width(), m_prefilterMipLevelSizes[mipLevel].height()));
QVector<QPair<int, quint32>> dynamicOffsets = {
{ 0, quint32(ubufElementSize * quint8(face)) },
{ 2, quint32(uBufSamplesElementSize * mipLevel) }
};
cb->setShaderResources(m_prefilterSrb, 2, dynamicOffsets.constData());
} else {
// Diffuse Irradiance
cb->setGraphicsPipeline(m_irradiancePipeline);
cb->setVertexInput(0, 1, &vbufBinding);
cb->setViewport(QRhiViewport(0, 0, m_prefilterMipLevelSizes[mipLevel].width(), m_prefilterMipLevelSizes[mipLevel].height()));
QVector<QPair<int, quint32>> dynamicOffsets = {
{ 0, quint32(ubufElementSize * quint8(face)) },
{ 2, quint32(uBufIrradianceElementSize) }
};
cb->setShaderResources(m_irradianceSrb, 1, dynamicOffsets.constData());
}
Q_QUICK3D_PROFILE_START(QQuick3DProfiler::Quick3DRenderCall);
cb->draw(36);
QSSGRHICTX_STAT(rhiCtx, draw(36, 1));
Q_QUICK3D_PROFILE_END_WITH_ID(QQuick3DProfiler::Quick3DRenderCall, 36llu | (1llu << 32), profilingId);
cb->endPass();
QSSGRHICTX_STAT(rhiCtx, endRenderPass());
Q_QUICK3D_PROFILE_END_WITH_STRING(QQuick3DProfiler::Quick3DRenderPass, 0, QSSG_RENDERPASS_NAME("reflection_map", mipLevel, face));
if (m_timeSlicing == QSSGRenderReflectionProbe::ReflectionTimeSlicing::IndividualFaces)
break;
}
if (mipLevel > 0 && m_timeSlicing == QSSGRenderReflectionProbe::ReflectionTimeSlicing::AllFacesAtOnce) {
m_timeSliceFrame++;
if (m_timeSliceFrame >= mipmapCount)
m_timeSliceFrame = 1;
break;
}
}
cb->debugMarkEnd();
}
QSSGReflectionMapEntry QSSGReflectionMapEntry::withRhiTexturedCubeMap(quint32 probeIdx, QRhiTexture *prefiltered)
{
QSSGReflectionMapEntry e;
e.m_probeIndex = probeIdx;
e.m_rhiPrefilteredCube = prefiltered;
return e;
}
QSSGReflectionMapEntry QSSGReflectionMapEntry::withRhiCubeMap(quint32 probeIdx,
QRhiTexture *cube,
QRhiTexture *prefiltered,
QRhiRenderBuffer *depthStencil)
{
QSSGReflectionMapEntry e;
e.m_probeIndex = probeIdx;
e.m_rhiCube = cube;
e.m_rhiPrefilteredCube = prefiltered;
e.m_rhiDepthStencil = depthStencil;
return e;
}
void QSSGReflectionMapEntry::destroyRhiResources()
{
delete m_rhiCube;
m_rhiCube = nullptr;
// Without depth stencil the prefiltered cubemap is assumed to be not owned here and shouldn't be deleted
if (m_rhiDepthStencil)
delete m_rhiPrefilteredCube;
m_rhiPrefilteredCube = nullptr;
delete m_rhiDepthStencil;
m_rhiDepthStencil = nullptr;
qDeleteAll(m_rhiRenderTargets);
m_rhiRenderTargets.clear();
delete m_rhiRenderPassDesc;
m_rhiRenderPassDesc = nullptr;
delete m_prefilterPipeline;
m_prefilterPipeline = nullptr;
delete m_irradiancePipeline;
m_irradiancePipeline = nullptr;
delete m_prefilterSrb;
m_prefilterSrb = nullptr;
delete m_irradianceSrb;
m_irradianceSrb = nullptr;
delete m_prefilterVertBuffer;
m_prefilterVertBuffer = nullptr;
delete m_prefilterFragBuffer;
m_prefilterFragBuffer = nullptr;
delete m_irradianceFragBuffer;
m_irradianceFragBuffer = nullptr;
delete m_rhiPrefilterRenderPassDesc;
m_rhiPrefilterRenderPassDesc = nullptr;
for (const auto &e : std::as_const(m_rhiPrefilterRenderTargetsMap))
qDeleteAll(e);
m_rhiPrefilterRenderTargetsMap.clear();
m_prefilterMipLevelSizes.clear();
}
QT_END_NAMESPACE