:constrution: wip: glTF loading PoC

src/bin/platformer/graphics.rs

@@ -107,7 +107,7 @@ impl Graphics {
 			Pass::default ()
 				.shader (&shaders [0])
 				.flags ([
-					(gl::CULL_FACE, true),
+					(gl::CULL_FACE, false),
 					(gl::DEPTH_TEST, true),
 					(gl::TEXTURE_2D, true),
 					(gl::STENCIL_TEST, false),
@@ -164,6 +164,7 @@ impl Graphics {
 		&self,
 		state: &GameState,
 		gl_state: &mut GlState,
+		level: &crate::LoadedLevel,
 	) {
 		use uniforms as u;
 		
@@ -192,9 +193,9 @@ impl Graphics {
 			let attrs = shader_vars.attrs;
 			let unis = shader_vars.unis;
 			
-			self.texture_earth.bind ();
+			if false {
+				self.texture_earth.bind ();
 				
-			{
 				let mvp = view_mat * 
 				Mat4::from_translation (state.player.pos) * 
 				Mat4::from_scale ((0.5, 0.5, 0.5).into ());
@@ -209,25 +210,89 @@ impl Graphics {
 			self.texture_crate.bind ();
 			glezz::uniform_3fv (unis [&u::ALBEDO], &white);
 			
-			for aabb in &state.aabbs {
-				let min = aabb.min;
-				let max = aabb.max;
-				let center = (min + max) / 2.0;
-				let scale = (max - min) / 2.0;
+			if false {
+				for aabb in &state.aabbs {
+					let min = aabb.min;
+					let max = aabb.max;
+					let center = (min + max) / 2.0;
+					let scale = (max - min) / 2.0;
 					
-				let mvp = view_mat * 
-				Mat4::from_translation (center) *
-				Mat4::from_scale (scale);
-				glezz::uniform_matrix_4fv (unis [&u::MVP], &mvp);
+					let mvp = view_mat * 
+					Mat4::from_translation (center) *
+					Mat4::from_scale (scale);
+					glezz::uniform_matrix_4fv (unis [&u::MVP], &mvp);
 					
-				self.mesh_cube.draw_all (attrs, |_| {
-					true
-				});
+					self.mesh_cube.draw_all (attrs, |_| {
+						true
+					});
+				}
+			}
+			
+			if true {
+				use opengl_rust::renderable_model::attributes as a;
+				
+				let scene = level.level.scenes ().next ().unwrap ();
+				
+				unsafe {
+					gl::BindBuffer (gl::ARRAY_BUFFER, 0);
+					gl::BindBuffer (gl::ELEMENT_ARRAY_BUFFER, 0);
+				}
+				
+				for node in scene.nodes () {
+					let mesh = match node.mesh () {
+						None => continue,
+						Some (x) => x,
+					};
+					
+					let mvp = view_mat * 
+					Mat4::from_cols_array_2d (&node.transform ().matrix ());
+					glezz::uniform_matrix_4fv (unis [&u::MVP], &mvp);
+					
+					for prim in mesh.primitives () {
+						use gltf::{
+							Semantic,
+						};
+						
+						let positions = match prim.get (&Semantic::Positions) {
+							None => continue,
+							Some (x) => x,
+						};
+						let pos_view = match positions.view () {
+							None => continue,
+							Some (x) => x,
+						};
+						let indices = match prim.indices () {
+							None => continue,
+							Some (x) => x,
+						};
+						let indices_view = match indices.view () {
+							None => continue,
+							Some (x) => x,
+						};
+						
+						unsafe {
+							gl::VertexAttribPointer (
+								attrs [a::POS].unwrap (),
+								3,
+								gl::FLOAT,
+								0,
+								4 * 3,
+								&level.buffer [positions.offset () + pos_view.offset ()] as *const u8 as *const c_void,
+							);
+							gl::DrawElements (
+								gl::TRIANGLES,
+								3 * 12,
+								gl::UNSIGNED_SHORT,
+								&level.buffer [indices.offset () + indices_view.offset ()] as *const u8 as *const c_void,
+							);
+						}
+					}
+				}
 			}
 			
 			glezz::uniform_3fv (unis [&u::ALBEDO], &shadow_blue);
 			
-			if true {
+			if false {
 				// Raycast for player shadow
 				let coll = opengl_rust::physics::get_candidate (
 					&[], &state.aabbs,
@@ -274,7 +339,7 @@ impl Graphics {
 				}
 			}
 			
-			{
+			if false {
 				let sky_mvp_mat = view_mat * Mat4::from_scale ((64.0, 64.0, 64.0).into ());
 				
 				self.texture_sky.bind ();
@@ -284,7 +349,7 @@ impl Graphics {
 				glezz::uniform_3fv (unis [&u::MIN_ALBEDO], &black);
 				glezz::uniform_1i (unis [&u::TEXTURE], 0);
 				
-				// self.mesh_sky.draw_all (attrs, |_| true);
+				self.mesh_sky.draw_all (attrs, |_| true);
 			}
 		});
 	}

src/bin/platformer/main.rs

@@ -50,6 +50,13 @@ impl Default for GameState {
 	}
 }
 
+impl GameState {
+	fn reset_level (&mut self, level: &LoadedLevel) {
+		self.player = Default::default ();
+		self.player.pos = level.player_spawn;
+	}
+}
+
 #[tokio::main]
 async fn main () -> Result <()> {
 	tracing_subscriber::fmt::fmt ()
@@ -81,16 +88,7 @@ async fn main () -> Result <()> {
 	
 	let mut time_step = TimeStep::new (60, 1000);
 	
-	let level = gltf::Gltf::open ("gltf/level-00.gltf")?;
-	for scene in level.scenes () {
-		for node in scene.nodes () {
-			println! (
-				"Node #{} has {} children",
-				node.index(),
-				node.children().count(),
-			);
-		}
-	}
+	let level = LoadedLevel::from_path ("gltf/level-00.glb")?;
 	
 	let mut graphics = Graphics::new ();
 	
@@ -106,6 +104,8 @@ async fn main () -> Result <()> {
 	let player_jump_speed = 8.0;
 	let mut player_jump_vec: Option <Vec3> = None;
 	
+	game_state.reset_level (&level);
+	
 	'running: loop {
 		let _frames_to_do = time_step.step ();
 		let mut player_wants_to_jump = false;
@@ -117,7 +117,7 @@ async fn main () -> Result <()> {
 					break 'running
 				},
 				Event::KeyDown { keycode: Some (Keycode::R), .. } => {
-					game_state = Default::default ();
+					game_state.reset_level (&level);
 				},
 				Event::KeyDown { keycode: Some (Keycode::Space), .. } => {
 					player_wants_to_jump = true;
@@ -180,7 +180,7 @@ async fn main () -> Result <()> {
 		
 		window.gl_make_current (&gl_ctx).unwrap ();
 		
-		graphics.draw (&game_state, &mut gl_state);
+		graphics.draw (&game_state, &mut gl_state, &level);
 		graphics.frames += 1;
 		
 		window.gl_swap_window ();
@@ -191,6 +191,87 @@ async fn main () -> Result <()> {
 	Ok (())
 }
 
+struct LoadedLevel {
+	player_spawn: Vec3,
+	buffer: Vec <u8>,
+	level: gltf::Document,
+}
+
+impl LoadedLevel {
+	fn from_path (path: &str) -> Result <Self> {
+		use gltf::{
+			Semantic,
+			scene::Transform,
+		};
+		
+		let (level, buffers, _) = gltf::import (path)?;
+		let buffer = match buffers.get (0) {
+			None => bail! ("gltf didn't load any buffers"),
+			Some (x) => x.0.to_vec (),
+		};
+		
+		let scene = match level.scenes ().next () {
+			None => bail! ("No scenes in glTF file"),
+			Some (x) => x,
+		};
+		
+		let mut player_spawn = None;
+		
+		for node in scene.nodes () {
+			if node.name () == Some ("Player Spawn") {
+				let (translation, _, _) = node.transform ().decomposed ();
+				player_spawn = Some (Vec3::from (translation));
+			}
+			else if let Some (camera) = node.camera () {
+				
+			}
+			else if let Some (mesh) = node.mesh () {
+				println! ("Node {:?} is a mesh", node.name ());
+				for (i, prim) in mesh.primitives ().enumerate () {
+					let positions = match prim.get (&Semantic::Positions) {
+						None => continue,
+						Some (x) => x,
+					};
+					let normals = match prim.get (&Semantic::Normals) {
+						None => continue,
+						Some (x) => x,
+					};
+					let indices = match prim.indices () {
+						None => continue,
+						Some (x) => x,
+					};
+					let pos_view = match positions.view () {
+						None => continue,
+						Some (x) => x,
+					};
+					let norm_view = match normals.view () {
+						None => continue,
+						Some (x) => x,
+					};
+					let indices_view = match indices.view () {
+						None => continue,
+						Some (x) => x,
+					};
+					dbg! (positions.offset (), pos_view.offset (), pos_view.stride ());
+					dbg! (normals.offset (), norm_view.offset (), norm_view.stride ());
+					dbg! (indices.offset (), indices.data_type (), indices_view.offset (), indices_view.stride ());
+				}
+			}
+		}
+		
+		let player_spawn = match player_spawn {
+			None => bail! ("glTF file must have `Player Spawn` node"),
+			Some (x) => x,
+		};
+		
+		Ok (Self {
+			buffer,
+			level,
+			player_spawn,
+		})
+	}
+}
+
 struct ShaderLocations {
 	attr_pos: u32,
 	attr_normal: u32,