added BSP support, depth seems broken

Makefile

@@ -4,7 +4,7 @@ SHADER_DIR  := shaders
 BUILD_DIR   := build
 
 CXX         := g++
-CXXFLAGS    := -g -std=c++23 -Wall -Wextra -Wpedantic -Wno-missing-field-initializers -Wno-unused-function
+CXXFLAGS    := -g -std=c++23 -Wall -Wextra -Wpedantic -Wno-missing-field-initializers -Wno-unused-function # -fsanitize=address
 LDFLAGS     := -lSDL3
 
 GLSLC       := glslc

shaders/post.frag

@@ -70,7 +70,7 @@ void main() {
 
   const mat3 sobely = mat3(-1.0, 0.0, 1.0, -2.0, 0.0, 2.0, -1.0, 0.0, 1.0);
 
-  int time = int(fract(time_padded.x/1000.0) * 3.0);
+  int time = 2;//int(fract(time_padded.x/100.0) * 3.0);
   switch(time) {
     case 0:
       out_color = texture(screen, uv);
@@ -84,6 +84,6 @@ void main() {
   }
 
   out_color = out_color * 0.9 +
-    0.1*((t(uv.x, uv.y) > 0.01)?
+    0.8*((t(uv.x, uv.y) > 0.01)?
       vec4(abs(f(sobelx) + f(sobely)), 0.0, 0.0, 1.0) : vec4(0.0));
 }

shaders/ray.frag

@@ -20,10 +20,19 @@ const float EPS_DIST = 1e-6;
 
 
 float sdf(vec3 point){
-  float t = 1.0 + 5.0*abs(sin(time_padded.x));
-  vec3 s1_local = point; //mod(point, vec3(t)) - vec3(t/2.0);
-  float s1 = length(s1_local) - t;
-  return s1;
+  vec3 p = point - cam_pos.xyz;
+  const float speed = 1.0 + exp(sin(time_padded.x));
+  float t = time_padded.x * speed;
+  const int N = 5;
+  float d = 1.0/EPS_DIST;
+  float orbit_radius = 0.4;
+  float radius = 0.03;
+  for(int i = 0; i < N; i++) {
+    float phase = ((3.14159 * 2.0) / float(N)) * float(i);
+    d = min(d, length(p - orbit_radius*vec3(sin(t + phase), 0.0, cos(t + phase))) - radius);
+  }
+
+  return d;
 }
 
 vec3 getnormal(vec3 p) {
@@ -41,14 +50,17 @@ vec4 march(vec3 point, vec3 ray, float max_depth) {
   int i;
   for (i = 0; i < MAX_MARCH_STEPS && totaldist < max_depth; i += 1) {
     float h = sdf(point);
-    point += h * ray;
-    if (h + totaldist > max_depth)
-      break;
+    
     if (h < EPS_DIST) {
-      return vec4(point, totaldist + h);
+      totaldist += h;
+      return vec4(point, totaldist);
     }
-
+    
     totaldist += h;
+    if (totaldist > max_depth)
+      break;
+      
+    point += h * ray;
   }
 
   return vec4(-1.0);
@@ -72,7 +84,7 @@ vec4 kernel(float max_depth) {
 float linearize_depth(vec2 uv) {
   float d = texture(depth_tex, uv).r;
   if (d >= 1.0) return 1000.0;
-  vec4 ndc = vec4((uv * 2.0 - 1.0), d * 2.0 - 1.0, 1.0);
+  vec4 ndc = vec4(uv * 2.0 - 1.0, d * 2.0 - 1.0, 1.0);
   vec4 view_pos = inv_projection * ndc;
   view_pos /= view_pos.w;
   return -view_pos.z; // view space, positive distance
@@ -82,8 +94,9 @@ float linearize_depth(vec2 uv) {
 void main() {
   float max_depth = linearize_depth(uv);
   vec4 hit = kernel(max_depth);
+
   if (hit.w > 0.0) {
-    out_color = vec4(getnormal(hit.xyz), 1.0);
+   out_color = vec4(1.0);//out_color = vec4(getnormal(hit.xyz), 1.0);
   } else {
     out_color = texture(screen, uv);
   }

shaders/scene.frag

@@ -5,6 +5,7 @@ layout(location = 2) in vec3 v_normal_vs;
 
 layout(location = 0) out vec4 out_color;
 
+
 void main() {
     vec3 light_dir = normalize(vec3(0.5, 1.0, 0.8));
 
@@ -12,5 +13,9 @@ void main() {
     float diffuse  = max(dot(v_normal_vs, light_dir), 0.0);
     float lighting = ambient + (1.0 - ambient) * diffuse;
 
-    out_color = vec4(v_color.rgb * lighting, v_color.a);
+    out_color = v_color * vec4(v_normal_vs,1.0);
+    //out_color = vec4(v_color.rgb * lighting, v_color.a);
+    //out_color = vec4(1.0);
+    //out_color = vec4(viz(v_normal_vs), 1.0);
+    //out_color = vec4(lighting);
 }

src/BSP.cpp

@@ -0,0 +1,285 @@
+#include "bsp/BSP.h"
+
+#include <SDL3/SDL_iostream.h>
+#include <SDL3/SDL_log.h>
+#include <set>
+
+
+#include <cstring>
+
+/* changes handedness by swapping z and y */
+template<typename T>
+static inline void change_swizzle(T& v) {
+	auto tmp = v.y;
+	v.y = v.z;
+	v.z = tmp;
+}
+
+using namespace HLBSP;
+
+static inline void copy_data(void* file_data, std::string& dst, Lump& lump) {
+	dst.resize(lump.len);
+	std::memcpy(dst.data(), (uint8_t*)file_data + (size_t)lump.offset, lump.len);
+}
+
+template<typename T>
+static inline void copy_data(void* file_data, std::vector<T>& dst, Lump& lump) {
+	dst.resize(lump.len / sizeof(T));
+	std::memcpy(dst.data(), ((uint8_t*)file_data) + lump.offset, lump.len);
+}
+
+static inline glm::vec2 calc_tex_coords(glm::vec3 v, const TexInfo& t) {
+	change_swizzle(v);
+	return glm::vec2(
+		t.shift_s + glm::dot(v, t.shift_s_dir),
+		t.shift_t + glm::dot(v, t.shift_t_dir)
+	);
+}
+
+void BSP::load_vertices() {
+	SDL_Log("Loading vertices");
+	std::set<int> present_faces;
+	std::vector<Face> visible_faces;
+	// if (visibility_test) {
+	// 	auto leaf_idx = determine_leaf(cam_pos);
+
+	// 	auto fr_planes = frustum(view);
+
+	// 	if (leaf_idx == last_leaf)
+	// 		return;
+
+	// 	last_leaf = leaf_idx;
+	// 	auto& cam_leaf = leaves[leaf_idx];
+
+
+	// 	std::vector<Leaf> visible_leafs;
+	// 	for (auto& leaf : leaves) {
+
+	// 		const auto min = leaf.bb_mins;
+	// 		const auto max = leaf.bb_maxes;
+
+	// 		const glm::vec3 bounding_planes[8] = {
+	// 			{ min.x, min.y, min.z },
+	// 			{ max.x, min.y, min.z },
+	// 			{ max.x, max.y, min.z },
+	// 			{ min.x, max.y, min.z },
+	// 			{ min.x, min.y, max.z },
+	// 			{ max.x, min.y, max.z },
+	// 			{ max.x, max.y, max.z },
+	// 			{ min.x, max.y, max.z },
+	// 		};
+
+	// 		if (determine_visibility(cam_leaf, leaf, fr_planes, bounding_planes))
+	// 			visible_leafs.push_back(leaf);
+	// 	}
+
+	// 	for (const auto& leaf : visible_leafs) {
+	// 		for (size_t i = 0; i < leaf.n_mark_surfaces; i++) {
+	// 			auto idx = mark_surfaces[leaf.first_mark_surface_idx + i];
+	// 			if (present_faces.contains(idx))
+	// 				continue;
+
+	// 			present_faces.insert(idx);
+	// 			visible_faces.push_back(faces[idx]);
+	// 		}
+	// 	}
+	// } else {
+		visible_faces = faces;
+	// }
+
+	textured_vertices.clear();
+
+	for (auto& face : visible_faces) {
+		auto& tex_info = tex_infos[face.tex_info_idx];
+
+		for (int16_t i = 1, j = 2; j < face.n_surf_edges; i++, j++) {
+			vec3 pos[3] = {
+			processed_vertices[face.first_surf_edge_idx],
+			processed_vertices[face.first_surf_edge_idx+i],
+			processed_vertices[face.first_surf_edge_idx+j],
+			};
+
+			vec3 face_normal = glm::normalize(glm::cross(pos[1] - pos[0], pos[2] - pos[0]));
+
+			textured_vertices.push_back(Vertex{
+				.pos = pos[0],
+				.uv = calc_tex_coords(processed_vertices[face.first_surf_edge_idx], tex_info),
+				.norm = face_normal
+			});
+			textured_vertices.push_back(Vertex{
+				.pos = pos[1],
+				.uv = calc_tex_coords(processed_vertices[face.first_surf_edge_idx+i], tex_info),
+				.norm = face_normal
+			});
+			textured_vertices.push_back(Vertex{
+				.pos = pos[2],
+				.uv = calc_tex_coords(processed_vertices[face.first_surf_edge_idx+j], tex_info),
+				.norm = face_normal
+			});
+		}
+	}
+	SDL_Log("Done loading vertices");
+}
+
+int BSP::get_index_from_surfedge(int surfedge) {
+	int surf = surfedges[surfedge];
+	if(surf >= 0) {
+		return edges[surf].vertex_indices[0];
+	}
+	else {
+		return edges[-surf].vertex_indices[1];
+	}
+}
+
+int BSP::determine_leaf(glm::vec3 cam_pos) {
+	/* use SDF of planes to determine relative position with respect to partitioning planes */
+	int idx = 0;
+	/* positive values are node indices, negative values are leaf indices */
+	while (idx >= 0) {
+		const auto& plane = planes[nodes[idx].plane];
+		const auto dist = glm::dot(plane.norm, cam_pos) - plane.dist;
+
+		if (dist >= 0)
+			idx = nodes[idx].children[0];
+		else
+			idx = nodes[idx].children[1];
+	}
+
+	return -idx - 1;
+}
+
+
+bool BSP::determine_visibility(const Leaf& cam_leaf, const Leaf& leaf, const std::array<glm::vec4, 6>& frustum, const glm::vec3 box_verts[8]) {
+	/* perform fustrum culling */
+	//return box_in_frustum(frustum, box_verts);
+	return true;
+}
+
+static std::vector<std::map<std::string, std::string>> load_entities(const std::string& in) {
+	/* TODO */
+	return {
+		{{"test", "this"}},
+	};
+}
+
+static std::vector<MipTexture> load_mip_textures(const u8* data, u32 offset) {
+	const TextureLump* lump = reinterpret_cast<const TextureLump*>(data + offset);
+	std::vector<MipTexture> ret;
+	ret.resize(lump->n_mip_textures);
+
+	for(size_t i = 0; i < ret.size(); i++) {
+		ret[i] = *reinterpret_cast<const MipTexture*>(data + lump->offsets[i]);
+	}
+
+	return ret;
+}
+
+BSP::BSP(const std::string& fname) : filename(fname) {
+	size_t fsize;
+	uint8_t* fdata = (uint8_t*)SDL_LoadFile(fname.c_str(), &fsize);
+	if(!fdata) {
+		SDL_Log("Can't load bsp file: %s", fname.c_str());
+		return;
+	}
+
+	file_data.resize(fsize);
+	memcpy(file_data.data(), fdata, fsize);
+	header = reinterpret_cast<Header*>(file_data.data());
+
+
+	if(header->version != 30) {
+		SDL_Log("BSP file not expected version (Half Life has version 30)!");
+	}
+
+	SDL_Log("Loading entities\n");
+	std::string entities_buff;
+	copy_data(file_data.data(), entities_buff, header->entities);
+	entities = load_entities(entities_buff);
+
+	SDL_Log("Loading planes\n");
+	copy_data(file_data.data(), planes, header->planes);
+	/* change swizzle */
+	for (auto& plane : planes) {
+		change_swizzle(plane.norm);
+	}
+
+	//SDL_Log("Loading textures\n");
+	//textures = load_mip_textures(file_data.data(), header->textures.offset);
+
+	SDL_Log("Loading vertices\n");
+	copy_data(file_data.data(), vertices, header->vertices);
+	for (auto& vertex : vertices) {
+		change_swizzle(vertex);
+	}
+
+	SDL_Log("Loading nodes\n");
+	copy_data(file_data.data(), nodes, header->nodes);
+	for (auto& node : nodes) {
+		change_swizzle(node.bb_mins);
+		change_swizzle(node.bb_maxes);
+	}
+
+	SDL_Log("Loading texinfo\n");
+	copy_data(file_data.data(), tex_infos, header->texinfo);
+
+	SDL_Log("Loading faces\n");
+	copy_data(file_data.data(), faces, header->faces);
+
+	SDL_Log("Loading lightmap\n");
+	lightmap.lights = reinterpret_cast<rgb*>(file_data.data()+header->lighting.offset);
+
+	SDL_Log("Loading clip nodes\n");
+	copy_data(file_data.data(), clip_nodes, header->clip_nodes);
+	
+	SDL_Log("Loading leaves\n");
+	copy_data(file_data.data(), leaves, header->leaves);
+	for (auto& leaf : leaves) {
+		change_swizzle(leaf.bb_mins);
+		change_swizzle(leaf.bb_maxes);
+	}
+
+	SDL_Log("Loading mark surfaces\n");
+	copy_data(file_data.data(), mark_surfaces, header->mark_surfaces);
+
+	SDL_Log("Loading edges\n");
+	copy_data(file_data.data(), edges, header->edges);
+
+	SDL_Log("Loading surfedges\n");
+	copy_data(file_data.data(), surfedges, header->surf_edges);
+	processed_vertices.reserve(surfedges.size());
+	/* use this to build our processed_vertices, idea thanks to gzalo's HalfMapper */
+	for(const auto& s : surfedges) {
+		processed_vertices.push_back(vertices[edges[s > 0? s : -s].vertex_indices[s<=0]]);
+	}
+
+	SDL_Log("Loading models\n");
+	copy_data(file_data.data(), models, header->models);
+	for (auto& model : models) {
+		change_swizzle(model.bb_mins);
+		change_swizzle(model.bb_maxes);
+	}
+
+	size_t max_vertex_count = 0;
+
+	for (const auto& face : faces) {
+		max_vertex_count += (face.n_surf_edges - 2) * 3;
+	}
+	
+	SDL_Log("Creating vertex buffer of size %zu\n", max_vertex_count);
+	textured_vertices.reserve(max_vertex_count);
+}
+
+
+std::vector<::Vertex> BSP::get_vertices() {
+	std::vector<::Vertex> ret;
+	ret.reserve(textured_vertices.size());
+
+	for(const auto& tex_vert : textured_vertices) {
+		ret.push_back({
+			.pos = tex_vert.pos,
+			.color = vec4(tex_vert.uv.x, tex_vert.uv.y, tex_vert.uv.x * tex_vert.uv.y, 1.0),
+			.normal = tex_vert.pos,
+		});
+	}
+	return ret;
+}

src/bsp/BSP.h

@@ -0,0 +1,212 @@
+#pragma once
+#include "../types.h"
+
+#include <glm/glm.hpp>
+
+#include <vector>
+#include <string>
+#include <map>
+
+
+#define MAX_TEXTURE_NAME 16
+#define MIP_LEVELS 4
+
+#define MAX_MAP_HULLS 4
+/* contains loading functions for Half Life BSPs */
+namespace HLBSP {
+
+	struct Lump {
+		uint32_t offset;
+		uint32_t len;
+	};
+	using rgb = glm::uvec3;
+	using rgba = glm::uvec4;
+
+	using vec3 = glm::vec3;
+	using vec2 = glm::vec2;
+	using ivec3 = glm::vec<3, int16_t>;
+
+	struct Header {
+		uint32_t version;
+
+		union {
+			Lump lumps[15];
+			struct {
+				Lump	entities,
+						planes,
+						textures,
+						vertices,
+						visibility,
+						nodes,
+						texinfo,
+						faces,
+						lighting,
+						clip_nodes,
+						leaves,
+						mark_surfaces,
+						edges,
+						surf_edges,
+						models;
+			};
+		};
+	};
+
+	struct Plane {
+		vec3 norm;
+		float dist;
+		/* exists for certain optimizations (swaped y and z) */
+		enum PlaneType {
+			eX,
+			eZ,
+			eY,
+			eAnyX,
+			eAnyZ,
+			eAnyY,
+		} type;
+	};
+
+	struct TextureLump {
+		uint32_t n_mip_textures;
+		int32_t offsets[];
+	};
+
+	struct MipTexture {
+		char name[MAX_TEXTURE_NAME];
+		uint32_t width, height;
+		/* is 0 if stored in WAD, otherwise, offset is from beginning of this struct */
+		uint32_t mip_offsets[MIP_LEVELS];
+	};
+
+	struct Vertex {
+		vec3 pos;
+		vec2 uv;
+		vec3 norm;
+	};
+
+	struct Vis {};
+
+	struct Node {
+		int32_t plane;
+		/* negative numbers are leaf indices */
+		int16_t children[2];
+
+		/* bounding box coords (integer) */
+		ivec3 bb_mins;
+		ivec3 bb_maxes;
+
+		int16_t first_face_idx;
+		int16_t n_faces;
+	};
+
+	struct TexInfo {
+		vec3 shift_s_dir;
+		float shift_s;
+		vec3 shift_t_dir;
+		float shift_t;
+		uint32_t mip_tex_idx;
+		/* seems to always be 0 */
+		uint32_t flags;
+		
+	};
+
+	struct Face {
+		uint16_t plane_idx;
+		/* set if different normals orientation */
+		uint16_t plane_side;
+		uint32_t first_surf_edge_idx;
+		int16_t n_surf_edges;
+		int16_t tex_info_idx;
+		uint8_t lighting_styles[4];
+		uint32_t lightmap_offset;
+	};
+
+
+	struct Lightmap {
+		rgb* lights;
+	};
+
+	struct ClipNode {
+		int32_t plane_idx;
+		/* negative numbers are contents */
+		int16_t children[2];
+	};
+
+	struct Leaf {
+		enum {
+			eEmpty = -1,
+			eSolid = -2,
+			eWater = -3,
+			eSlime = -4,
+			eLava = -5,
+			eSky = -6,
+			eOrigin = -7,
+			eClip = -8,
+			eCurrent0 = -9,
+			eCurrent90 = -10,
+			eCurrent180 = -11,
+			eCurrent270 = -12,
+			eCurrentUp = -13,
+			eCurrentDown = -14,
+			eTranslucent = -15,
+		} contents;
+		/* if this is -1, no VIS data */
+		int32_t vis_offset;
+		ivec3 bb_mins;
+		ivec3 bb_maxes;
+		uint16_t first_mark_surface_idx;
+		uint16_t n_mark_surfaces;
+		uint8_t ambient_sound_levels[4];
+	};
+
+	typedef uint16_t MarkSurface;
+
+	struct Edge {
+		uint16_t vertex_indices[2];
+	};
+
+	typedef int32_t Surfedge;
+
+	struct Model {
+		vec3 bb_mins;
+		vec3 bb_maxes;
+		vec3 origin;
+		int32_t head_node_indices[MAX_MAP_HULLS];
+		int32_t vis_leafs;
+		int32_t first_face_idx;
+		int32_t n_faces;
+	};
+
+	struct BSP {
+		BSP(const std::string& fname);
+		void load_vertices();
+		int determine_leaf(vec3 cam_pos);
+		bool determine_visibility(const Leaf& cam_leaf, const Leaf& leaf, const std::array<glm::vec4, 6>& frustum, const vec3 box_verts[8]);
+		int get_index_from_surfedge(int surfedge);
+
+		Header* header;
+		std::string filename;
+		std::vector<uint8_t> file_data;
+
+		std::vector<::std::map<::std::string, std::string>> entities;
+		std::vector<Plane> planes;
+		std::vector<MipTexture> textures;
+		std::vector<glm::vec3> vertices;
+		std::vector<glm::vec3> processed_vertices;
+		/* skipping vis for now */
+		std::vector<Node> nodes;
+		std::vector<TexInfo> tex_infos;
+		std::vector<Face> faces;
+		Lightmap lightmap;
+		std::vector<ClipNode> clip_nodes;
+		std::vector<Leaf> leaves;
+		std::vector<MarkSurface> mark_surfaces;
+		std::vector<Edge> edges;
+		std::vector<Surfedge> surfedges;
+		std::vector<Model> models;
+
+		std::vector<::Vertex> get_vertices();
+		std::vector<Vertex> textured_vertices;
+		/* to eliminate needless re-loading*/
+		int last_leaf = -0x1337;
+	};
+}

src/camera.h

@@ -8,7 +8,7 @@ struct Camera {
   vec3  target     = vec3(0.0f, 0.0f,  0.0f);
   vec3  up         = vec3(0.0f, 1.0f,  0.0f);
   float fov        = 60.0f;
-  float move_speed = 0.05f;
+  float move_speed = 0.5f;
   float look_speed = 1.0f;
   float pitch      = 0.0f;
   float yaw        = -90.0f;

src/renderer.cpp

@@ -1,9 +1,13 @@
 #include "renderer.h"
 #include "gpu.h"
 #include <SDL3/SDL_gamepad.h>
+#include <SDL3/SDL_oldnames.h>
+#include <SDL3/SDL_timer.h>
+#include <iomanip>
 #include <iostream>
 #define TINYOBJLOADER_IMPLEMENTATION
 #include "tiny_obj_loader.h"
+#include "bsp/BSP.h"
 
 
 bool Renderer::init(SDL_Window* w) {
@@ -13,7 +17,7 @@ bool Renderer::init(SDL_Window* w) {
 
   SDL_ClaimWindowForGPUDevice(dev, win);
 
-  load_obj();
+  load_bsp();
 
   render_sampler = create_linear_sampler(dev);
   SDL_GPUSamplerCreateInfo depth_sampler_info {
@@ -50,8 +54,23 @@ void Renderer::destroy() {
   SDL_DestroyGPUDevice(dev);
 }
 
+bool Renderer::load_bsp() {
+  const std::string& path = "assets/hl1.bsp";
+  HLBSP::BSP bsp(path);
+  bsp.load_vertices();
+  vertices = bsp.get_vertices();
+
+  SDL_GPUBufferCreateInfo info {
+    .usage = SDL_GPU_BUFFERUSAGE_VERTEX,
+    .size  = static_cast<uint32_t>(vertices.size() * sizeof(Vertex)),
+  };
+  vert_buff = SDL_CreateGPUBuffer(dev, &info);
+  upload_buffer(dev, vert_buff, vertices.data(), info.size);
+  return true;
+}
+
 bool Renderer::load_obj() {
-  const std::string& path = "assets/homer.obj";
+  const std::string& path = "assets/vox.obj";
   tinyobj::attrib_t attrib;
   std::vector<tinyobj::shape_t> shapes;
   std::vector<tinyobj::material_t> materials;
@@ -96,12 +115,13 @@ bool Renderer::load_obj() {
       for(int v = 0; v < 3; v++) {
         vertices.push_back(Vertex {
           .pos    = pos[v],
-          .color  = vec4(abs(sin(pos[v].x)), abs(cos(pos[v].y)), abs(sin(pos[v].z) * cos(pos[v].y)), 1.0f),
+          .color  = vec4(1.0),//vec4(abs(sin(pos[v].x)), abs(cos(pos[v].y)), abs(sin(pos[v].z) * cos(pos[v].y)), 1.0f),
           .normal = nor[v],
         });
       }
     }
   }
+  std::cerr << "Vertices: " << vertices.size() << std::endl; 
 
   SDL_GPUBufferCreateInfo info {
     .usage = SDL_GPU_BUFFERUSAGE_VERTEX,
@@ -292,10 +312,15 @@ void Renderer::add_gol_layer() {
   upload_buffer(dev, vert_buff, vertices.data(), info.size);
 }
 
-
 void Renderer::draw(const CameraUBO& ubo) {
-  if(frame % 256 == 0 && (frame >> 8) < 20) {
-    add_gol_layer();
+  static float last_time = (float)SDL_GetPerformanceCounter()/(float)SDL_GetPerformanceFrequency();
+  // if(frame % 256 == 0 && (frame >> 8) < 20) {
+  //   add_gol_layer();
+  // }
+  if(frame % 60 == 59) {
+    float now = (float)SDL_GetPerformanceCounter()/(float)SDL_GetPerformanceFrequency();
+    std::cerr << std::setprecision(3) << 60.0f/(now-last_time) << " fps\r";
+    last_time = now;
   }
 
   SDL_GPUCommandBuffer* cmd = SDL_AcquireGPUCommandBuffer(dev);

src/renderer.h

@@ -32,6 +32,7 @@ struct Renderer {
 
 private:
   bool load_obj();
+  bool load_bsp();
   void add_gol_layer();
   void resize_render_texture(uint32_t w, uint32_t h);
   void pass_scene(SDL_GPUCommandBuffer* cmd, const CameraUBO& ubo);