anki-3d-engine/AnKi/Renderer/TemporalAA.cpp

// Copyright (C) 2009-2021, Panagiotis Christopoulos Charitos and contributors.
// All rights reserved.
// Code licensed under the BSD License.
// http://www.anki3d.org/LICENSE

#include <AnKi/Renderer/TemporalAA.h>
#include <AnKi/Renderer/Renderer.h>
#include <AnKi/Renderer/GBuffer.h>
#include <AnKi/Renderer/LightShading.h>
#include <AnKi/Renderer/Tonemapping.h>
#include <AnKi/Renderer/MotionVectors.h>

namespace anki {

TemporalAA::TemporalAA(Renderer* r)
	: RendererObject(r)
{
}

TemporalAA::~TemporalAA()
{
}

Error TemporalAA::init(const ConfigSet& config)
{
	ANKI_R_LOGI("Initializing TAA");
	Error err = initInternal(config);

	if(err)
	{
		ANKI_R_LOGE("Failed to init TAA");
	}

	return Error::NONE;
}

Error TemporalAA::initInternal(const ConfigSet& config)
{
	ANKI_CHECK(m_r->getResourceManager().loadResource("Shaders/TemporalAAResolve.ankiprog", m_prog));

	for(U32 i = 0; i < 2; ++i)
	{
		ShaderProgramResourceVariantInitInfo variantInitInfo(m_prog);
		variantInitInfo.addConstant("VARIANCE_CLIPPING_GAMMA", 2.7f);
		variantInitInfo.addConstant("BLEND_FACTOR", 1.0f / 16.0f);
		variantInitInfo.addConstant("FB_SIZE",
									UVec2(m_r->getInternalResolution().x(), m_r->getInternalResolution().y()));
		variantInitInfo.addMutation("VARIANCE_CLIPPING", 1);
		variantInitInfo.addMutation("YCBCR", 0);

		const ShaderProgramResourceVariant* variant;
		m_prog->getOrCreateVariant(variantInitInfo, variant);
		m_grProgs[i] = variant->getProgram();
	}

	for(U i = 0; i < 2; ++i)
	{
		TextureInitInfo texinit = m_r->create2DRenderTargetInitInfo(
			m_r->getInternalResolution().x(), m_r->getInternalResolution().y(),
			LIGHT_SHADING_COLOR_ATTACHMENT_PIXEL_FORMAT,
			TextureUsageBit::SAMPLED_FRAGMENT | TextureUsageBit::SAMPLED_COMPUTE | TextureUsageBit::IMAGE_COMPUTE_WRITE,
			"TemporalAA");

		texinit.m_initialUsage = TextureUsageBit::SAMPLED_FRAGMENT;

		m_rtTextures[i] = m_r->createAndClearRenderTarget(texinit);
	}

	m_tonemappedRtDescr =
		m_r->create2DRenderTargetDescription(m_r->getInternalResolution().x(), m_r->getInternalResolution().y(),
											 Format::R8G8B8A8_UNORM, "TemporalAA Tonemapped");
	m_tonemappedRtDescr.bake();

	return Error::NONE;
}

void TemporalAA::populateRenderGraph(RenderingContext& ctx)
{
	RenderGraphDescription& rgraph = ctx.m_renderGraphDescr;

	const U32 historyRtIdx = (m_r->getFrameCount() + 1) & 1;
	const U32 renderRtIdx = !historyRtIdx;

	// Import RTs
	if(ANKI_LIKELY(m_rtTexturesImportedOnce[historyRtIdx]))
	{
		m_runCtx.m_historyRt = rgraph.importRenderTarget(m_rtTextures[historyRtIdx]);
	}
	else
	{
		m_runCtx.m_historyRt = rgraph.importRenderTarget(m_rtTextures[historyRtIdx], TextureUsageBit::SAMPLED_FRAGMENT);
		m_rtTexturesImportedOnce[historyRtIdx] = true;
	}

	m_runCtx.m_renderRt = rgraph.importRenderTarget(m_rtTextures[renderRtIdx], TextureUsageBit::NONE);
	m_runCtx.m_tonemappedRt = rgraph.newRenderTarget(m_tonemappedRtDescr);

	// Create pass
	ComputeRenderPassDescription& pass = rgraph.newComputeRenderPass("TemporalAA");

	pass.setWork([this](RenderPassWorkContext& rgraphCtx) {
		CommandBufferPtr& cmdb = rgraphCtx.m_commandBuffer;

		cmdb->bindShaderProgram(m_grProgs[m_r->getFrameCount() & 1]);

		cmdb->bindSampler(0, 0, m_r->getSamplers().m_trilinearClamp);
		rgraphCtx.bindTexture(0, 1, m_r->getGBuffer().getDepthRt(),
							  TextureSubresourceInfo(DepthStencilAspectBit::DEPTH));
		rgraphCtx.bindColorTexture(0, 2, m_r->getLightShading().getRt());
		rgraphCtx.bindColorTexture(0, 3, m_runCtx.m_historyRt);
		rgraphCtx.bindColorTexture(0, 4, m_r->getMotionVectors().getMotionVectorsRt());
		rgraphCtx.bindImage(0, 5, m_runCtx.m_renderRt, TextureSubresourceInfo());
		rgraphCtx.bindImage(0, 6, m_runCtx.m_tonemappedRt, TextureSubresourceInfo());
		rgraphCtx.bindUniformBuffer(0, 7, m_r->getTonemapping().getAverageLuminanceBuffer());

		dispatchPPCompute(cmdb, 8, 8, m_r->getInternalResolution().x(), m_r->getInternalResolution().y());
	});

	pass.newDependency({m_runCtx.m_renderRt, TextureUsageBit::IMAGE_COMPUTE_WRITE});
	pass.newDependency({m_runCtx.m_tonemappedRt, TextureUsageBit::IMAGE_COMPUTE_WRITE});
	pass.newDependency({m_r->getGBuffer().getDepthRt(), TextureUsageBit::SAMPLED_COMPUTE,
						TextureSubresourceInfo(DepthStencilAspectBit::DEPTH)});
	pass.newDependency({m_r->getLightShading().getRt(), TextureUsageBit::SAMPLED_COMPUTE});
	pass.newDependency({m_runCtx.m_historyRt, TextureUsageBit::SAMPLED_COMPUTE});
	pass.newDependency({m_r->getMotionVectors().getMotionVectorsRt(), TextureUsageBit::SAMPLED_COMPUTE});
}

} // end namespace anki