+ | Light array sent to gpu

includes/RT.hpp

@@ -38,6 +38,7 @@
 # include <vector>
 # include <string>
 # include <memory>
+# include <set>
 # include <map>
 
 struct Vertex {

includes/RT/Scene.hpp

@@ -68,6 +68,9 @@ class Scene
 		void							addObject(Object *object);
 		void							addMaterial(Material *material);
 		
+		void							updateLightAndObjects(int mat_id);
+		std::set<int>					getGPULights();
+
 		const std::vector<GPUObject>	&getObjectData() const;
 		std::vector<GPUMaterial>		&getMaterialData();
 		GPUVolume						&getVolume();
@@ -79,6 +82,8 @@ class Scene
 		std::vector<GPUObject>		_gpu_objects;
 		std::vector<GPUMaterial>	_gpu_materials;
 
+		std::set<int>				_gpu_lights;
+
 		GPUVolume					_gpu_volume;
 
 		Camera						*_camera;

scenes/test.rt

@@ -27,4 +27,4 @@ sp	0 1 5				1				7
 
 cy	0 1 2		0.5 2		-1.5 0 0.75		1
 
-OBJ obj/Lowpoly_tree_sample.obj
+# OBJ obj/Lowpoly_tree_sample.obj

shaders/compute.glsl

@@ -61,6 +61,12 @@ layout(std430, binding = 2) buffer MaterialBuffer
 	GPUMaterial materials[];
 };
 
+layout(std430, binding = 3) buffer LightsBuffer
+{
+    int lightsIndex[];
+};
+
+
 layout(std140, binding = 0) uniform CameraData
 {
     GPUCamera camera;
@@ -71,7 +77,9 @@ layout(std140, binding = 1) uniform VolumeData
     GPUVolume volume;
 };
 
+
 uniform int     u_objectsNum;
+uniform int     u_lightsNum;
 uniform vec2    u_resolution;
 uniform int		u_pixelisation;
 uniform int		u_frameCount;

shaders/light.glsl

@@ -71,9 +71,10 @@ vec3	sampleLights(vec3 position, inout uint rng_state)
 {
 	vec3 light = vec3(0.0);
     
-    for (int i = 0; i < u_objectsNum; i++)
+    for (int i = 0; i < u_lightsNum; i++)
     {
-        GPUObject obj = objects[i];
+        int light_index = lightsIndex[i];
+        GPUObject obj = objects[light_index];
         GPUMaterial mat = materials[obj.mat_index];
         if (mat.emission > 0.0)
         {
@@ -83,7 +84,7 @@ vec3	sampleLights(vec3 position, inout uint rng_state)
             Ray shadow_ray = Ray(position + light_dir * 0.01, light_dir);
             hitInfo shadow_hit = traceRay(shadow_ray);
 
-            if (shadow_hit.obj_index == i)
+            if (shadow_hit.obj_index == light_index)
                 light += mat.emission * mat.color / (light_dist);
         }
     }
@@ -116,6 +117,6 @@ vec3	sampleLights(vec3 position, inout uint rng_state)
 void    calculateLightColor(GPUMaterial mat, hitInfo hit, inout vec3 color, inout vec3 light, inout uint rng_state)
 {
     color *= mat.color;
-    light += mat.emission * mat.color;
-    // light += sampleLights(hit.position, rng_state);
+    // light += mat.emission * mat.color;
+    light += sampleLights(hit.position, rng_state);
 }

srcs/RT.cpp

@@ -44,6 +44,14 @@ int main(int argc, char **argv)
 	glBufferData(GL_SHADER_STORAGE_BUFFER, sizeof(GPUMaterial) * material_data.size(), nullptr, GL_STATIC_DRAW);
 	glBindBufferBase(GL_SHADER_STORAGE_BUFFER, 2, materialSSBO);
 
+	
+	GLuint lightSSBO;
+	glGenBuffers(1, &lightSSBO);
+	glBindBuffer(GL_SHADER_STORAGE_BUFFER, lightSSBO);
+	glBufferData(GL_SHADER_STORAGE_BUFFER, scene.getGPULights().size() * sizeof(int), nullptr, GL_STATIC_DRAW);
+	glBindBufferBase(GL_SHADER_STORAGE_BUFFER, 3, lightSSBO);
+
+
 	GLuint cameraUBO;
 	glGenBuffers(1, &cameraUBO);
 	glBindBuffer(GL_UNIFORM_BUFFER, cameraUBO);
@@ -56,6 +64,7 @@ int main(int argc, char **argv)
 	glBufferData(GL_UNIFORM_BUFFER, sizeof(GPUVolume), nullptr, GL_STATIC_DRAW);
 	glBindBufferBase(GL_UNIFORM_BUFFER, 1, volumeUBO);
 
+
 	shader.attach();
 
 	Vertex vertices[3] = {{{-1.0f, -1.0f}, {0.0f, 0.0f}},{{3.0f, -1.0f}, {2.0f, 0.0f}},{{-1.0f, 3.0f}, {0.0f, 2.0f}}};
@@ -72,6 +81,11 @@ int main(int argc, char **argv)
 		glBindBuffer(GL_SHADER_STORAGE_BUFFER, materialSSBO);
 		glBufferSubData(GL_SHADER_STORAGE_BUFFER, 0, material_data.size() * sizeof(GPUMaterial), material_data.data());
 
+		std::set<int> gpu_lights = scene.getGPULights();
+		std::vector<int> gpu_lights_array(gpu_lights.begin(), gpu_lights.end());
+		glBindBuffer(GL_SHADER_STORAGE_BUFFER, lightSSBO);
+		glBufferSubData(GL_SHADER_STORAGE_BUFFER, 0, gpu_lights_array.size() * sizeof(int), gpu_lights_array.data());
+		
 		GPUCamera camera_data = scene.getCamera()->getGPUData();
 		glBindBuffer(GL_UNIFORM_BUFFER, cameraUBO);
 		glBufferSubData(GL_UNIFORM_BUFFER, 0, sizeof(GPUCamera), &camera_data);
@@ -79,8 +93,10 @@ int main(int argc, char **argv)
 		glBindBuffer(GL_UNIFORM_BUFFER, volumeUBO);
 		glBufferSubData(GL_UNIFORM_BUFFER, 0, sizeof(GPUVolume), &scene.getVolume());
 
+
 		shader.set_int("u_frameCount", window.getFrameCount());
 		shader.set_int("u_objectsNum", object_data.size());
+		shader.set_int("u_lightsNum", gpu_lights.size());
 		shader.set_int("u_pixelisation", window.getPixelisation());
 		shader.set_float("u_time", (float)(glfwGetTime()));
 		shader.set_vec2("u_resolution", glm::vec2(WIDTH, HEIGHT));

srcs/class/Scene.cpp

@@ -139,6 +139,27 @@ void		Scene::addMaterial(Material *material)
 	_gpu_materials.push_back(gpu_mat);
 }
 
+void		Scene::updateLightAndObjects(int mat_id)
+{
+	for (unsigned int i = 0; i < _gpu_objects.size(); i++)
+	{
+		if (_gpu_objects[i].mat_index == mat_id)
+			_gpu_lights.insert(i);
+	}
+	for (auto it = _gpu_lights.begin(); it != _gpu_lights.end(); )
+	{
+        if (_gpu_materials[_gpu_objects[*it].mat_index].emission <= 0.0) 
+            it = _gpu_lights.erase(it);
+		else
+            ++it;
+    }
+}
+
+std::set<int>				Scene::getGPULights()
+{
+	return (_gpu_lights);
+}
+
 const std::vector<GPUObject>&	Scene::getObjectData() const
 {
 	return (_gpu_objects);

srcs/class/SceneParser.cpp

@@ -257,12 +257,16 @@ bool		SceneParser::parseLine(const std::string &line)
 		if (it != object_parsers.end())
 		{
 			Object *obj = it->second(ss);
-			(void) _scene->getMaterial(obj->getMaterialIndex()); //verify material
+			
+			GPUMaterial mat = _scene->getMaterial(obj->getMaterialIndex()); //verify material
 			
 			if (obj->getType() == Object::Type::PORTAL)
 				_scene->addObject(static_cast<Portal *>(obj)->createSupportQuad());
 			
 			_scene->addObject(obj);
+
+			if (mat.emission > 0.0)
+				_scene->updateLightAndObjects(obj->getMaterialIndex());
 		}
 
 		if (identifier == "MAT")

srcs/class/Window.cpp

@@ -197,7 +197,11 @@ void Window::imGuiRender()
 		
 		ImGui::Text("Material %d", i);
 		has_changed |= ImGui::ColorEdit3("Color", &mat.color[0]);
-		has_changed |= ImGui::SliderFloat("Emission", &mat.emission, 0.0f, 10.0f);
+		if (ImGui::SliderFloat("Emission", &mat.emission, 0.0f, 10.0f))
+		{
+			has_changed = 1;
+			_scene->updateLightAndObjects(i);
+		}
 		
 		if (mat.type == 0)
 		{