pathtracer.cpp 12.9 KB
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#include "pathtracer.h"

#include <random>

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#include <engine/Messaging.h>
#include <engine/Time.h>
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#include <pugixml/pugixml.hpp>
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#include <util/files.h>
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namespace glare
{
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	namespace raytrace
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	{
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		Pathtracer::Pathtracer()
			: Pathtracer(std::make_shared<RayGeneratorDefault>())
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		{

		}

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		Pathtracer::Pathtracer(std::shared_ptr<RayGeneratorBase> ray_generator)
			: Pathtracer(std::shared_ptr<SceneCollector>(nullptr), ray_generator)
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		{
		}

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		Pathtracer::Pathtracer(std::shared_ptr<SceneCollector> collector)
			: Pathtracer(collector, std::make_shared<RayGeneratorDefault>())
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		{
		}

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		Pathtracer::Pathtracer(std::shared_ptr<SceneCollector> collector, std::shared_ptr<RayGeneratorBase> ray_generator)
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		{
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			m_bounce_count_thresholds[unsigned(EffectType::eDiffuse)] = 4;
			m_bounce_count_thresholds[unsigned(EffectType::eTranslucent)] = 6;
			m_bounce_count_thresholds[unsigned(EffectType::eReflection)] = 6;
			m_bounce_count_thresholds[unsigned(EffectType::eRefraction)] = 12;
			m_bounce_count_thresholds[unsigned(EffectType::eTransparent)] = 12;
			m_bounce_count_thresholds[unsigned(EffectType::eEmissive)] = 0;

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			m_ls_bounce_count_thresholds[unsigned(EffectType::eDiffuse)] = 1;
			m_ls_bounce_count_thresholds[unsigned(EffectType::eTranslucent)] = 3;
			m_ls_bounce_count_thresholds[unsigned(EffectType::eReflection)] = 3;
			m_ls_bounce_count_thresholds[unsigned(EffectType::eRefraction)] = 6;
			m_ls_bounce_count_thresholds[unsigned(EffectType::eTransparent)] = 8;
			m_ls_bounce_count_thresholds[unsigned(EffectType::eEmissive)] = 0;

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			m_linespace_config.distance_threshold = 8.f;
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			m_render_config.bounces = 16;
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			m_render_shader = core::ShaderProgram::makeUnique(files::shader("/raytracer/pathtracer.compute").string());
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			m_ray_generator = ray_generator;
			m_trace_buffer = std::make_unique<core::Buffer<gl::BufferType::eShaderStorage>>();
			core::MessageHandler::getInstance().registerReceiver(core::GlobalMessages::c_scene_changed, *this);
			if (collector)
				initialize(collector);
		}

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		Pathtracer::~Pathtracer()
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		{

		}

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		void Pathtracer::loadSettings(const fs::path &xml_file)
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		{
			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");
			m_bounce_count_thresholds[unsigned(EffectType::eDiffuse)] = bounces_child.find_child_by_attribute("item", "name", "diffuse").attribute("value").as_uint(2);
			m_bounce_count_thresholds[unsigned(EffectType::eTranslucent)] = bounces_child.find_child_by_attribute("item", "name", "translucent").attribute("value").as_uint(4);
			m_bounce_count_thresholds[unsigned(EffectType::eReflection)] = bounces_child.find_child_by_attribute("item", "name", "reflect").attribute("value").as_uint(4);
			m_bounce_count_thresholds[unsigned(EffectType::eRefraction)] = bounces_child.find_child_by_attribute("item", "name", "refract").attribute("value").as_uint(8);
			m_bounce_count_thresholds[unsigned(EffectType::eTransparent)] = bounces_child.find_child_by_attribute("item", "name", "transparent").attribute("value").as_uint(8);
			m_bounce_count_thresholds[unsigned(EffectType::eEmissive)] = bounces_child.find_child_by_attribute("item", "name", "emissive").attribute("value").as_uint(1);

			//ls thresholds
			const auto ls_thresholds_child = pt_child.find_child_by_attribute("group", "name", "ls-thresholds");
			m_ls_bounce_count_thresholds[unsigned(EffectType::eDiffuse)] = ls_thresholds_child.find_child_by_attribute("item", "name", "diffuse").attribute("value").as_uint(2);
			m_ls_bounce_count_thresholds[unsigned(EffectType::eTranslucent)] = ls_thresholds_child.find_child_by_attribute("item", "name", "translucent").attribute("value").as_uint(4);
			m_ls_bounce_count_thresholds[unsigned(EffectType::eReflection)] = ls_thresholds_child.find_child_by_attribute("item", "name", "reflect").attribute("value").as_uint(4);
			m_ls_bounce_count_thresholds[unsigned(EffectType::eRefraction)] = ls_thresholds_child.find_child_by_attribute("item", "name", "refract").attribute("value").as_uint(8);
			m_ls_bounce_count_thresholds[unsigned(EffectType::eTransparent)] = ls_thresholds_child.find_child_by_attribute("item", "name", "transparent").attribute("value").as_uint(8);
			m_ls_bounce_count_thresholds[unsigned(EffectType::eEmissive)] = ls_thresholds_child.find_child_by_attribute("item", "name", "emissive").attribute("value").as_uint(1);

			m_linespace_config.accuracy_threshold = ls_thresholds_child.find_child_by_attribute("item", "name", "accuracy").attribute("value").as_float(0.5f);
			m_linespace_config.shadow_threshold = ls_thresholds_child.find_child_by_attribute("item", "name", "shadow").attribute("value").as_float(0.5f);
			m_linespace_config.distance_threshold = ls_thresholds_child.find_child_by_attribute("item", "name", "distance").attribute("value").as_float(10.f);

			m_render_config.clamp_direct = pt_child.find_child_by_attribute("item", "name", "clamp-direct").attribute("value").as_float(8);
			m_render_config.clamp_indirect = pt_child.find_child_by_attribute("item", "name", "clamp-indirect").attribute("value").as_float(8);
		}

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		void Pathtracer::reset()
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		{
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			m_render_config.current_sample = 0;
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			if (m_color_store)
				gl::clearTextureImage(m_color_store->getID(), 0, gl::TextureFormat::eRGBA, gl::Type::eFloat, glm::value_ptr(glm::vec4(0)));
		}

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		const core::TextureRGBA_32F &Pathtracer::render(uint32_t width, uint32_t height)
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		{
			if (width != m_last_width || height != m_last_height) {
				m_last_width = width;
				m_last_height = height;
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				Log_Info << "RESIZED: " << width << ", " << height;

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				m_trace_buffer->reserve<trace_t>(width * height, gl::BufferUsage::eDynamicCopy);
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				m_render_target = std::make_unique<core::TextureRGBA_32F>(width, height);
				m_color_store = std::make_unique<core::TextureRGBA_32F>(width, height);
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				m_render_config.current_sample = 0;
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			}
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			for (unsigned sample = 0; sample < m_render_config.samples_per_frame; sample++) {
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				if (m_render_config.current_sample >= m_render_config.max_samples)
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					return *m_render_target;

				m_ray_generator->generate(*this);

				m_render_shader->use();

				m_render_shader->updateUniformImageRGBA32F("u_render_target", *m_render_target, gl::Access::eReadWrite);
				m_render_shader->updateUniformImageRGBA32F("u_color_store", *m_color_store, gl::Access::eReadWrite);

				m_render_shader->updateStorageBuffer("lights_buffer", m_collector->lightBuffer());
				m_render_shader->updateStorageBuffer("trace_buffer", m_trace_buffer);
				m_render_shader->updateStorageBuffer("mesh_buffer", m_collector->meshBuffer());
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				m_render_shader->updateStorageBuffer("object_bvh_buffer", m_collector->objectBVHNodeBuffer());
				m_render_shader->updateStorageBuffer("object_bvh_id_buffer", m_collector->objectBVHIDBuffer());
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				m_render_shader->updateStorageBuffer("material_buffer", m_collector->materialBuffer());

				m_render_shader->updateUniformStruct("u_camera", m_collector->getActiveCamera());

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				m_render_shader->updateUniformUInt("u_render_config.current_sample", m_render_config.current_sample);
				m_render_shader->updateUniformUInt("u_render_config.max_samples", m_render_config.max_samples);
				m_render_shader->updateUniformUInt("u_render_config.num_bounces", m_render_config.bounces);
				m_render_shader->updateUniformFloat("u_render_config.clamp_direct", m_render_config.clamp_direct);
				m_render_shader->updateUniformFloat("u_render_config.clamp_indirect", m_render_config.clamp_indirect);
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				if (m_skybox)
				{
					m_render_shader->updateUniformUInt64("u_environment.cubemap", m_skybox->getBindlessID());
					m_render_shader->updateUniformInt("u_environment.has", 1);
				}
				else
				{
					m_render_shader->updateUniformVec4("u_environment.color", glm::vec4(0.7f, 0.9f, 0.97f, 1));
					m_render_shader->updateUniformInt("u_environment.has", 0);
				}

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				m_render_shader->updateUniformFloat("u_linespace_properties.accuracy_quality", m_linespace_config.accuracy_threshold);
				m_render_shader->updateUniformFloat("u_linespace_properties.shadow_quality", m_linespace_config.shadow_threshold);
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				m_render_shader->updateUniformFloat("u_linespace_properties.distance_threshold", m_linespace_config.distance_threshold);
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				unsigned bounce_thresholds = 0;
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				for (int i = 0; i < 8; ++i)
				{
					bounce_thresholds |= (m_bounce_count_thresholds[i] & 0xf) << (4 * i);
				}
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				m_render_shader->updateUniformUInt("u_render_config.bounce_thresholds", bounce_thresholds);

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				m_linespace_config.bounce_thresholds = 0;
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				for (int i = 0; i < 8; ++i)
				{
					m_linespace_config.bounce_thresholds |= (m_ls_bounce_count_thresholds[i] & 0xf) << (4 * i);
				}
				m_render_shader->updateUniformUInt("u_linespace_properties.bounce_thresholds", m_linespace_config.bounce_thresholds);
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				m_render_shader->dispatchCompute2D(width, 4, height, 4);
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				++m_render_config.current_sample;
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			}

			return *m_render_target;
		}

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		void Pathtracer::saveRender(fs::path target) const
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		{
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			core::textures::saveTexture(target, *m_render_target);
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		}

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		void Pathtracer::setGenerator(std::shared_ptr<RayGeneratorBase> generator)
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		{
			m_ray_generator = generator;
			reset();
		}

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		void Pathtracer::initialize(std::shared_ptr<SceneCollector> collector)
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		{
			m_collector = collector;
			reset();
		}

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		void Pathtracer::handle(core::message_t& message)
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		{
			switch (message.name)
			{
			case core::GlobalMessages::c_scene_changed:
				reset();
				break;

			}
		}

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		const core::ShaderProgram& Pathtracer::shader() const
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		{
			return *m_render_shader;
		}

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		uint32_t Pathtracer::width() const
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		{
			return m_last_width;
		}

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		uint32_t Pathtracer::height() const
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		{
			return m_last_height;
		}

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		core::Buffer<gl::BufferType::eShaderStorage>& Pathtracer::traceBuffer() const
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		{
			return *m_trace_buffer;
		}

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		const core::TextureRGBA_32F& Pathtracer::renderTarget() const
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		{
			return *m_render_target;
		}

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		std::shared_ptr<SceneCollector> Pathtracer::collector() const
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		{
			return m_collector;
		}
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		unsigned Pathtracer::currentSample() const
		{
			return m_render_config.current_sample;
		}

		void Pathtracer::setEffectBounces(EffectType type, uint8_t bounces)
		{
			uint8_t clamped = bounces & 0xf;

			if (clamped != bounces)
			{
				Log_Warn << bounces << " - value larger than 15 (0xf). Result of " << clamped << " may be unintended.";
			}

			m_bounce_count_thresholds[unsigned(type)] = clamped;
			reset();
		}

		uint8_t Pathtracer::getEffectBounces(EffectType type)
		{
			return m_bounce_count_thresholds[unsigned(type)];
		}

		void Pathtracer::setLinespaceBounceThresholds(EffectType type, uint8_t bounces)
		{
			uint8_t clamped = bounces & 0xf;

			if (clamped != bounces)
			{
				Log_Warn << bounces << " - value larger than 15 (0xf). Result of " << clamped << " may be unintended.";
			}

			m_ls_bounce_count_thresholds[unsigned(type)] = clamped;
			reset();
		}

		uint8_t Pathtracer::getLinespaceBounceThreshold(EffectType type)
		{
			return m_ls_bounce_count_thresholds[unsigned(type)];
		}

		void Pathtracer::setSkybox(std::shared_ptr<core::Skybox> skybox)
		{
			m_skybox = skybox;
			reset();
		}

		std::shared_ptr<core::Skybox> Pathtracer::getSkybox() const
		{
			return m_skybox;
		}

		void Pathtracer::setBounces(unsigned count)
		{
			reset();
			m_render_config.bounces = count;
		}

		unsigned Pathtracer::getBounces() const
		{
			return m_render_config.bounces;
		}

		void Pathtracer::setMaxSamples(unsigned count)
		{
			m_render_config.max_samples = count;
		}

		unsigned Pathtracer::getMaxSamples() const
		{
			return m_render_config.max_samples;
		}

		void Pathtracer::setSamplesPerFrame(unsigned count)
		{
			m_render_config.samples_per_frame = count;
		}

		unsigned Pathtracer::getSamplesPerFrame() const
		{
			return m_render_config.samples_per_frame;
		}

		void Pathtracer::setClampDirect(float clamp_direct)
		{
			m_render_config.clamp_direct = clamp_direct; reset();
		}

		float Pathtracer::getClampDirect() const
		{ 
			return m_render_config.clamp_direct; 
		}

		void Pathtracer::setClampIndirect(float clamp_indirect)
		{
			m_render_config.clamp_indirect = clamp_indirect; reset();
		}

		float Pathtracer::getClampIndirect() const
		{ 
			return m_render_config.clamp_indirect; 
		}

		void Pathtracer::setAccuracyThreshold(float accuracy_threshold)
		{
			m_linespace_config.accuracy_threshold = accuracy_threshold; reset();
		}

		float Pathtracer::getAccuracyThreshold() const
		{ 
			return m_linespace_config.accuracy_threshold; 
		}

		void Pathtracer::setShadowThreshold(float shadow_threshold)
		{
			m_linespace_config.shadow_threshold = shadow_threshold; reset();
		}

		float Pathtracer::getShadowThreshold() const
		{ 
			return m_linespace_config.shadow_threshold; 
		}

		void Pathtracer::setDistanceThreshold(float distance_threshold)
		{
			m_linespace_config.distance_threshold = distance_threshold; reset();
		}

		float Pathtracer::getDistanceThreshold() const
		{
			return m_linespace_config.distance_threshold; 
		}
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	}
}