Raytracer.cpp 6.34 KB
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#include "Raytracer.h"
#include <engine/Messaging.h>
#include <engine/Time.h>
#include <random>

namespace glare
{
	namespace advanced
	{
		Raytracer::Raytracer()
			: Raytracer(std::make_shared<RayGeneratorDefault>())
		{

		}

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

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

		Raytracer::Raytracer(std::shared_ptr<SceneCollector> collector, std::shared_ptr<RayGeneratorBase> ray_generator)
		{
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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_render_config.bounces = 8;
			m_render_shader = core::ShaderProgram::makeUnique("/raytracer/pathtracer.compute");
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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);
		}

		Raytracer::~Raytracer()
		{

		}

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		void Raytracer::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;
		}

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		void Raytracer::reset()
		{
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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 &Raytracer::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;
				m_trace_buffer->setData(sizeof(Trace) * width * height, gl::BufferUsage::eDynamicCopy);
				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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				unsigned bounce_thresholds  = 0;
				for (int i = 0; i < 8; ++i)
				{
					bounce_thresholds |= (m_bounce_count_thresholds[i] & 0xf) << (4 * i);
				}
				m_render_shader->updateUniformUInt("u_linespace_properties.bounce_count_thresholds", 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 Raytracer::saveRenderHDR(fs::path target) const
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		{
			io::ImageUtilities::saveTexture(target, *m_render_target);
		}

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		void Raytracer::saveRender(fs::path target) const
		{
			io::ImageUtilities::saveTextureForceUChar(target, *m_render_target);
		}

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

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

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

			}
		}

		const core::ShaderProgram& Raytracer::getShader() const
		{
			return *m_render_shader;
		}

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

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

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

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

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

		std::shared_ptr<SceneCollector> Raytracer::collector() const
		{
			return m_collector;
		}
	}
}