pathtracer.cpp 8.66 KB
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#include "pathtracer.h"

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#include <pugixml/pugixml.hpp>
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#include <core/rendering/texture_renderer.h>
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#include <util/files.h>
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namespace glare::raytrace
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{
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	Pathtracer::Pathtracer(std::shared_ptr<core::SceneNode> graph_root, RayGenType ray_generator)
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		: Pathtracer(graph_root ? std::make_shared<SceneCollector>(graph_root) : nullptr, ray_generator)
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	{
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	}
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	Pathtracer::Pathtracer(RayGenType ray_generator)
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		: Pathtracer(std::shared_ptr<SceneCollector>(nullptr), ray_generator)
	{
	}
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	Pathtracer::Pathtracer(std::shared_ptr<SceneCollector> collector, RayGenType ray_generator)
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	{
		Log_Hint << "Pathtracing Shader will now be compiled. This might take a couple of seconds.";
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		if (!m_render_shader) m_render_shader = std::make_unique<core::Program>(files::shader("/pathtracer/pathtracer.comp"));
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		m_ray_generator = ray_generator;
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		core::Context::current().messages()->addObserver(this, tags::scene);
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		m_render_target = std::make_unique<core::Texture>(core::Texture::Target::e2D, core::Texture::StoreFormat::eRGBA32Float);
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		if (collector)
			initialize(collector);
	}
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	Pathtracer::~Pathtracer()
	{
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		if (core::Context::hasCurrentContext() && !core::Context::current().window().isClosing())
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			core::Context::current().messages()->removeObserver(this, tags::scene);
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	}
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	void Pathtracer::loadSettings(const fs::path &xml_file)
	{
		pugi::xml_document preferences_file;
		Log_Info << "Pathtracer settings file load status: " << preferences_file.load_file(xml_file.c_str()).description();

		//Pathtracer
		const auto pt_child = preferences_file.child("pathtracer");

		//bounces
		const auto bounces_child = pt_child.find_child_by_attribute("group", "name", "bounces");
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		m_bounce_thresholds[Effect::eDiffusion] = static_cast<uint8_t>(bounces_child.find_child_by_attribute("item", "name", "diffusion").attribute("value").as_uint(2));
		m_bounce_thresholds[Effect::eReflection] = static_cast<uint8_t>(bounces_child.find_child_by_attribute("item", "name", "reflection").attribute("value").as_uint(4));
		m_bounce_thresholds[Effect::eTransmission] = static_cast<uint8_t>(bounces_child.find_child_by_attribute("item", "name", "transmission").attribute("value").as_uint(4));
		m_bounce_thresholds[Effect::eEmission] = static_cast<uint8_t>(bounces_child.find_child_by_attribute("item", "name", "emission").attribute("value").as_uint(8));
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		//ls thresholds
		const auto ls_thresholds_child = pt_child.find_child_by_attribute("group", "name", "ls-thresholds");
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		m_linespace_bounces[Effect::eDiffusion] = static_cast<uint8_t>(ls_thresholds_child.find_child_by_attribute("item", "name", "diffusion").attribute("value").as_uint(2));
		m_linespace_bounces[Effect::eReflection] = static_cast<uint8_t>(ls_thresholds_child.find_child_by_attribute("item", "name", "reflection").attribute("value").as_uint(4));
		m_linespace_bounces[Effect::eTransmission] = static_cast<uint8_t>(ls_thresholds_child.find_child_by_attribute("item", "name", "transmission").attribute("value").as_uint(4));
		m_linespace_bounces[Effect::eEmission] = static_cast<uint8_t>(ls_thresholds_child.find_child_by_attribute("item", "name", "emission").attribute("value").as_uint(8));
		m_linespace_distance = ls_thresholds_child.find_child_by_attribute("item", "name", "distance").attribute("value").as_float(10.f);
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		m_linespace_accuracy = ls_thresholds_child.find_child_by_attribute("item", "name", "accuracy").attribute("value").as_float(0.5f);
		m_linespace_shadow = ls_thresholds_child.find_child_by_attribute("item", "name", "shadow").attribute("value").as_float(0.5f);
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		m_clamp_direct = pt_child.find_child_by_attribute("item", "name", "clamp-direct").attribute("value").as_float(8);
		m_clamp_indirect = pt_child.find_child_by_attribute("item", "name", "clamp-indirect").attribute("value").as_float(8);
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	}
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	void Pathtracer::reset()
	{
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		m_samples_current = 0;
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		m_collector->apply(*m_render_shader);
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		m_render_shader->uniform("u_render_config.num_bounces", m_bounce_count);
		m_render_shader->uniform("u_render_config.clamp_direct", m_clamp_direct);
		m_render_shader->uniform("u_render_config.clamp_indirect", m_clamp_indirect);
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		for (int i = 0; i < 4; ++i)
		{
			const std::string idx = "[" + std::to_string(i) + "]";
			m_render_shader->uniform("u_render_config.bounce_thresholds" + idx, m_bounce_thresholds[i]);
			m_render_shader->uniform("u_linespace_properties.bounce_thresholds" + idx, m_linespace_bounces[i]);
		}
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		m_render_shader->uniform("u_linespace_properties.accuracy_quality", m_linespace_accuracy);
		m_render_shader->uniform("u_linespace_properties.shadow_quality", m_linespace_shadow);
		m_render_shader->uniform("u_linespace_properties.distance_threshold", m_linespace_distance);
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		m_render_shader->bindSubroutine(gl::ShaderType::eCompute, "u_light_sample[0]", "samplePoint");
		m_render_shader->bindSubroutine(gl::ShaderType::eCompute, "u_light_sample[1]", "sampleSpot");
		m_render_shader->bindSubroutine(gl::ShaderType::eCompute, "u_light_sample[2]", "sampleDirectional");
		m_render_shader->bindSubroutine(gl::ShaderType::eCompute, "u_light_sample[3]", "sampleAmbient");
	}
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	const core::Texture &Pathtracer::render(uint32_t width, uint32_t height)
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	{
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		if (width != m_width || height != m_height) {
			m_width = width;
			m_height = height;
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			m_trace_buffer.reserve<Trace>(width * height, gl::BufferUsage::eDynamicCopy);
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			m_render_target = std::make_unique<core::Texture>(core::Image<float>({ static_cast<int>(width), static_cast<int>(height) }, 4));
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			m_render_shader->uniform("u_render_target", m_render_target->imageAddress(gl::Access::eReadWrite));
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			m_render_shader->storageBuffer("trace_buffer", m_trace_buffer);
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			m_samples_current = 0;
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		}

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		if (m_samples_current == 0)
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		{
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			m_collector->collect();
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		}

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		for (unsigned sample = 0; sample < m_samples_per_frame; sample++) {
			if (m_samples_current >= m_samples_max)
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				return *m_render_target;
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			const static std::unique_ptr<RayGenerator> ray_generator = std::make_unique<RayGenerator>();
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			{
				LogTime("Generate Primary Rays", m_debug_times);
				ray_generator->generate(*this);
			}
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			{
				LogTime("Trace and Bounce", m_debug_times);
				m_render_shader->use();
				m_render_shader->uniform("u_render_config.current_sample", m_samples_current);
				m_render_shader->uniform("random_seed", ray_generator->randomSeed());
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				m_render_shader->dispatch2D(width, 16, height, 16);
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			}

			++m_samples_current;
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		}
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		return *m_render_target;
	}
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	void Pathtracer::draw(std::shared_ptr<core::SceneNode> node)
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	{
		// If it's not manually initialized via the GUI button, initialize the Pathtracer here.
		if (!m_collector)
			reload(node);
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		else
			m_collector->collect(node);
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		static const auto texture_renderer = core::TextureRenderer::makeSimple();
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		texture_renderer->draw(render(core::Context::current().window().getWidth(), core::Context::current().window().getHeight()));
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	}
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	void Pathtracer::saveRender(const fs::path& target) const
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	{
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		if (target.extension() == ".hdr")
		{
			m_render_target->get<float>().save(target);
		}
		else
		{
			m_render_target->get<uint8_t>().save(target);
		}
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	}
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	int& Pathtracer::EffectArray::operator[](Effect effect)
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	{
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		return m_data[static_cast<size_t>(effect)];
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	}

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	const int& Pathtracer::EffectArray::operator[](Effect effect) const
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	{
		return m_data[static_cast<size_t>(effect)];
	}

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	int& Pathtracer::EffectArray::operator[](int effect)
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	{
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		return m_data[effect];
	}

	const int& Pathtracer::EffectArray::operator[](int effect) const
	{
		return m_data[effect];
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	}
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	Pathtracer::LogTime::LogTime(std::string label, bool enabled)
		: m_enabled(enabled), m_label(std::move(label))
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	{
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		core::ClockGL::instance().start();
	}

	Pathtracer::LogTime::~LogTime()
	{
		if (m_enabled)
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			Log_Hint << "Log Time for label=\"" << m_label << "\": " << core::ClockGL::instance().end() << " ns";
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	}
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	void Pathtracer::initialize(std::shared_ptr<SceneCollector> collector)
	{
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		assert(collector != nullptr);
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		m_collector = collector;
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		reset();
	}
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	void Pathtracer::reload(std::shared_ptr<core::SceneNode> graph_root)
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	{
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		assert(graph_root != nullptr);

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		if (!m_collector)
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			m_collector = std::make_shared<SceneCollector>();
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		m_collector->setDirty(DirtyFlags::eAll);
		m_collector->collect(graph_root);
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		reset();
	}
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	void Pathtracer::onNotify(msg::id_type id, msg::message_type message)
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	{
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		switch (id)
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		{
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		case tags::scene:
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			reset();
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			break;
		default: break;
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		}
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	}
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	const core::Program& Pathtracer::shader() const
	{
		return *m_render_shader;
	}
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	uint32_t Pathtracer::width() const
	{
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		return m_width;
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	}
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	uint32_t Pathtracer::height() const
	{
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		return m_height;
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	}
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	core::Buffer& Pathtracer::traceBuffer()
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	{
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		return m_trace_buffer;
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	}
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	const core::Texture& Pathtracer::renderTarget() const
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	{
		return *m_render_target;
	}
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	std::shared_ptr<SceneCollector> Pathtracer::collector() const
	{
		return m_collector;
	}
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}