Beautiful badly-lit debug arrows

src/bin/pumpkin.rs

@@ -211,6 +211,11 @@ impl ShaderClosure {
 	}
 }
 
+struct Arrow {
+	origin: Vec3,
+	direction: Vec3,
+}
+
 fn main () {
 	let sdl_context = sdl2::init ().unwrap ();
 	let video_subsystem = sdl_context.video ().unwrap ();
@@ -272,6 +277,7 @@ fn main () {
 	let mesh_pitch = renderable_from_iqm_file ("pitch.iqm");
 	let mesh_arrow = renderable_from_iqm_file ("arrow.iqm");
 	
+	let magenta = color_from_255 ((255.0, 0.0, 255.0));
 	let orange = color_from_255 ((210.0, 125.0, 44.0));
 	let green = color_from_255 ((52.0, 101.0, 36.0));
 	let white = color_from_255 ((255.0, 255.0, 255.0));
@@ -360,7 +366,7 @@ fn main () {
 		
 		let shadow_mat = {
 			let mut mat = Mat4::identity ();
-			mat.set_z_axis ((0.25, 0.125, 0.0, 0.0).into ());
+			mat.set_z_axis ((-0.25, 0.125, 0.0, 0.0).into ());
 			mat
 		};
 		
@@ -373,7 +379,7 @@ fn main () {
 		
 		let sky_mvp_mat = view_mat * Mat4::from_scale ((16.0, 16.0, 16.0).into ());
 		
-		let light = Vec3::from ((2.0, 0.0, 5.0)).normalize ();
+		let light = Vec3::from ((0.25, -0.125, 1.0)).normalize ();
 		
 		glezz::clear_color (1.0f32, 0.0f32, 1.0f32, 1.0f32);
 		glezz::clear (gl::COLOR_BUFFER_BIT | gl::DEPTH_BUFFER_BIT | gl::STENCIL_BUFFER_BIT);
@@ -387,6 +393,50 @@ fn main () {
 		
 		let world_model_mat = Mat4::identity ();
 		
+		let arrows = vec![
+			Arrow {
+				origin: (0.0, 0.0, 1.0).into (),
+				direction: (0.0, 0.0, 1.0).into (),
+			},
+			Arrow {
+				origin: (1.0, 0.0, 1.0).into (),
+				direction: (1.0, 0.0, 0.0).into (),
+			},
+			Arrow {
+				origin: (0.0, 1.0, 1.0).into (),
+				direction: (0.0, 1.0, 0.0).into (),
+			},
+		];
+		
+		let arrow_mats: Vec <_> = arrows.iter ().map (|arrow| {
+			let d = arrow.direction;
+			
+			let up: Vec3 = if d.z () > 0.5 {
+				(-1.0, 0.0, 0.0)
+			}
+			else if d.z () < -0.5 {
+				(-1.0, 0.0, 0.0)
+			}
+			else {
+				(0.0, 0.0, 1.0)
+			}.into ();
+			
+			// These are probably all fucked
+			
+			let left = d.cross (up);
+			let up = d.cross (left);
+			
+			let mut dir_mat = Mat4::identity ();
+			
+			dir_mat.set_x_axis ((left.x (), left.y (), left.z (), 0.0).into ());
+			dir_mat.set_y_axis ((up.x (), up.y (), up.z (), 0.0).into ());
+			dir_mat.set_z_axis ((d.x (), d.y (), d.z (), 0.0).into ());
+			
+			Mat4::from_translation (arrow.origin) *
+			Mat4::from_scale ((0.125, 0.125, 0.125).into ()) *
+			dir_mat
+		}).collect ();
+		
 		use uniforms::*;
 		
 		shader_diffuse.with (|shader_vars| {
@@ -423,6 +473,14 @@ fn main () {
 				i != grass_index
 			});
 			
+			glezz::uniform_3fv (unis [&ALBEDO], &magenta);
+			for arrow_mat in &arrow_mats {
+				let mvp = view_mat * *arrow_mat;
+				
+				glezz::uniform_matrix_4fv (unis [&MVP], &mvp);
+				mesh_arrow.draw_all (attrs, |_| true);
+			}
+			
 			let draw_sky = true;
 			if draw_sky {
 				glezz::front_face (gl::CCW);
@@ -434,6 +492,11 @@ fn main () {
 				
 				mesh_sky.draw_all (attrs, |_| true);
 			}
+		});
+		
+		shader_shadow.with (|shader_vars| {
+			let unis = shader_vars.unis;
+			let attrs = shader_vars.attrs;
 			
 			glezz::enable (gl::STENCIL_TEST);
 			unsafe {
@@ -444,11 +507,6 @@ fn main () {
 				gl::DepthMask (0);
 				gl::StencilMask (1);
 			}
-		});
-		
-		shader_shadow.with (|shader_vars| {
-			let unis = shader_vars.unis;
-			let attrs = shader_vars.attrs;
 			
 			let view_mat = view_mat * shadow_mat;
 			
@@ -462,9 +520,11 @@ fn main () {
 			
 			mesh_pitch.draw_all (attrs, |i| i != grass_index);
 			
-			unsafe {
+			for arrow_mat in &arrow_mats {
-				gl::ColorMask (255, 255, 255, 255);
+				let mvp = view_mat * *arrow_mat;
-				gl::DepthMask (1);
+				
+				glezz::uniform_matrix_4fv (unis [&MVP], &mvp);
+				mesh_arrow.draw_all (attrs, |_| true);
 			}
 		});
 		
@@ -472,6 +532,11 @@ fn main () {
 			let unis = shader_vars.unis;
 			let attrs = shader_vars.attrs;
 			
+			unsafe {
+				gl::ColorMask (255, 255, 255, 255);
+				gl::DepthMask (1);
+			}
+			
 			glezz::front_face (gl::CW);
 			
 			let inverse_pumpkin = pumpkin_model_mat.inverse ();