Added snow particles

CHANGELOG.md

@@ -27,6 +27,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Lactose tolerant golems
 - 6 different gems. (Topaz, Amethyst, Sapphire, Emerald, Ruby and Diamond)
 - Poise system (not currently accessible to players for balancing reasons)
+- Snow particles
 
 ### Changed
 

assets/voxygen/shaders/particle-vert.glsl

@@ -15,6 +15,7 @@
 #include <globals.glsl>
 #include <srgb.glsl>
 #include <random.glsl>
+#include <lod.glsl>
 
 in vec3 v_pos;
 // in uint v_col;
@@ -55,6 +56,7 @@ const int ENERGY_NATURE = 14;
 const int FLAMETHROWER = 15;
 const int FIRE_SHOCKWAVE = 16;
 const int FIRE_BOWL = 17;
+const int SNOW = 18;
 
 // meters per second squared (acceleration)
 const float earth_gravity = 9.807;
@@ -140,6 +142,8 @@ void main() {
     float rand8 = hash(vec4(inst_entropy + 8));
     float rand9 = hash(vec4(inst_entropy + 9));
 
+    vec3 start_pos = inst_pos - focus_off.xyz;
+
     Attr attr;
     f_reflect = 1.0;
 
@@ -260,6 +264,17 @@ void main() {
             vec4(vec3(0.2 + rand7 * 0.2, 0.2 + (0.5 + rand6 * 0.5) * 0.6, 0), 1),
             spin_in_axis(vec3(rand6, rand7, rand8), rand9 * 3 + lifetime * 5)
         );
+    } else if (inst_mode == SNOW) {
+        float height = mix(-4, 60, pow(start_end(1, 0), 3));
+        float wind_speed = (inst_pos.z - 250) * 0.025;
+        vec3 offset = linear_motion(vec3(0), vec3(1, 1, 0) * wind_speed);
+        float end_alt = alt_at(start_pos.xy + offset.xy);
+        attr = Attr(
+            offset + vec3(0, 0, end_alt - start_pos.z + height) + vec3(sin(lifetime), sin(lifetime + 0.7), sin(lifetime * 0.5)) * 3,
+            vec3(mix(4, 0, pow(start_end(1, 0), 4))),
+            vec4(1),
+            spin_in_axis(vec3(rand6, rand7, rand8), rand9 * 3 + lifetime * 5)
+        );
     } else if (inst_mode == FIREFLY) {
         float raise = pow(sin(3.1416 * lifetime / inst_lifespan), 0.2);
         attr = Attr(
@@ -341,7 +356,7 @@ void main() {
     // Temporary: use shrinking particles as a substitute for fading ones
     attr.scale *= pow(attr.col.a, 0.25);
 
-    f_pos = (inst_pos - focus_off.xyz) + (v_pos * attr.scale * SCALE * mat3(attr.rot) + attr.offs);
+    f_pos = start_pos + (v_pos * attr.scale * SCALE * mat3(attr.rot) + attr.offs);
 
     // First 3 normals are negative, next 3 are positive
     // TODO: Make particle normals match orientation

voxygen/src/render/pipelines/particle.rs

@@ -114,6 +114,7 @@ pub enum ParticleMode {
     FlameThrower = 15,
     FireShockwave = 16,
     FireBowl = 17,
+    Snow = 18,
 }
 
 impl ParticleMode {

voxygen/src/scene/particle.rs

@@ -522,6 +522,14 @@ impl ParticleMgr {
                 mode: ParticleMode::Bee,
                 cond: |sd| sd.state.get_day_period().is_light(),
             },
+            BlockParticles {
+                blocks: |boi| &boi.snow,
+                range: 4,
+                rate: 0.025,
+                lifetime: 15.0,
+                mode: ParticleMode::Snow,
+                cond: |_| true,
+            },
         ];
 
         let mut rng = thread_rng();

voxygen/src/scene/terrain/watcher.rs

@@ -17,6 +17,7 @@ pub struct BlocksOfInterest {
     pub reeds: Vec<Vec3<i32>>,
     pub flowers: Vec<Vec3<i32>>,
     pub fire_bowls: Vec<Vec3<i32>>,
+    pub snow: Vec<Vec3<i32>>,
     // Note: these are only needed for chunks within the iteraction range so this is a potential
     // area for optimization
     pub interactables: Vec<Vec3<i32>>,
@@ -37,6 +38,7 @@ impl BlocksOfInterest {
         let mut interactables = Vec::new();
         let mut lights = Vec::new();
         let mut fire_bowls = Vec::new();
+        let mut snow = Vec::new();
 
         chunk
             .vol_iter(
@@ -49,21 +51,14 @@ impl BlocksOfInterest {
             )
             .for_each(|(pos, block)| {
                 match block.kind() {
-                    BlockKind::Leaves => {
+                    BlockKind::Leaves if thread_rng().gen_range(0..16) == 0 => leaves.push(pos),
-                        if thread_rng().gen_range(0..16) == 0 {
+                    BlockKind::Grass if thread_rng().gen_range(0..16) == 0 => grass.push(pos),
-                            leaves.push(pos)
+                    BlockKind::Water
-                        }
+                        if chunk.meta().contains_river() && thread_rng().gen_range(0..16) == 0 =>
-                    },
+                    {
-                    BlockKind::Grass => {
-                        if thread_rng().gen_range(0..16) == 0 {
-                            grass.push(pos)
-                        }
-                    },
-                    BlockKind::Water => {
-                        if chunk.meta().contains_river() && thread_rng().gen_range(0..16) == 0 {
                         river.push(pos)
-                        }
                     },
+                    BlockKind::Snow if thread_rng().gen_range(0..16) == 0 => snow.push(pos),
                     _ => match block.get_sprite() {
                         Some(SpriteKind::Ember) => {
                             fires.push(pos);
@@ -107,6 +102,7 @@ impl BlocksOfInterest {
             interactables,
             lights,
             fire_bowls,
+            snow,
         }
     }
 }