Added per-instance transformation matrix, variable wind swaying

assets/voxygen/shaders/sprite-vert.glsl

@@ -6,8 +6,12 @@
 in vec3 v_pos;
 in vec3 v_norm;
 in vec3 v_col;
-in vec3 inst_pos;
+in vec4 inst_mat0;
+in vec4 inst_mat1;
+in vec4 inst_mat2;
+in vec4 inst_mat3;
 in vec3 inst_col;
+in float inst_wind_sway;
 
 out vec3 f_pos;
 flat out vec3 f_norm;
@@ -17,10 +21,20 @@ out float f_light;
 const float SCALE = 1.0 / 11.0;
 
 void main() {
-	f_pos = inst_pos + v_pos * SCALE;
+	mat4 inst_mat;
+	inst_mat[0] = inst_mat0;
+	inst_mat[1] = inst_mat1;
+	inst_mat[2] = inst_mat2;
+	inst_mat[3] = inst_mat3;
+
+	f_pos = (inst_mat * vec4(v_pos * SCALE, 1)).xyz;
 
 	// Wind waving
-	f_pos += vec3(sin(tick.x * 1.7 + inst_pos.y * 0.2), sin(tick.x * 1.3 + inst_pos.x * 0.2), 0) * sin(v_pos.z * 0.03) * 0.5;
+	f_pos += inst_wind_sway * vec3(
+		sin(tick.x * 1.7 + f_pos.y * 0.2),
+		sin(tick.x * 1.3 + f_pos.x * 0.2),
+		0.0
+	) * sin(v_pos.z * 0.03) * 0.5;
 
 	f_norm = v_norm;
 

voxygen/src/render/pipelines/sprite.rs

@@ -1,5 +1,5 @@
 use super::{
-    super::{Pipeline, TgtColorFmt, TgtDepthFmt},
+    super::{util::arr_to_mat, Pipeline, TgtColorFmt, TgtDepthFmt},
     Globals, Light,
 };
 use gfx::{
@@ -22,8 +22,12 @@ gfx_defines! {
     }
 
     vertex Instance {
-        inst_pos: [f32; 3] = "inst_pos",
+        inst_mat0: [f32; 4] = "inst_mat0",
+        inst_mat1: [f32; 4] = "inst_mat1",
+        inst_mat2: [f32; 4] = "inst_mat2",
+        inst_mat3: [f32; 4] = "inst_mat3",
         inst_col: [f32; 3] = "inst_col",
+        inst_wind_sway: f32 = "inst_wind_sway",
     }
 
     pipeline pipe {
@@ -49,17 +53,22 @@ impl Vertex {
 }
 
 impl Instance {
-    pub fn new(inst_pos: Vec3<f32>, col: Rgb<f32>) -> Self {
+    pub fn new(mat: Mat4<f32>, col: Rgb<f32>, wind_sway: f32) -> Self {
+        let mat_arr = arr_to_mat(mat.into_col_array());
         Self {
-            inst_pos: inst_pos.into_array(),
+            inst_mat0: mat_arr[0],
+            inst_mat1: mat_arr[1],
+            inst_mat2: mat_arr[2],
+            inst_mat3: mat_arr[3],
             inst_col: col.into_array(),
+            inst_wind_sway: wind_sway,
         }
     }
 }
 
 impl Default for Instance {
     fn default() -> Self {
-        Self::new(Vec3::zero(), Rgb::broadcast(1.0))
+        Self::new(Mat4::identity(), Rgb::broadcast(1.0), 0.0)
     }
 }
 

voxygen/src/scene/terrain.rs

@@ -47,6 +47,19 @@ struct MeshWorkerResponse {
     started_tick: u64,
 }
 
+struct SpriteConfig {
+    wind_sway: f32, // 1.0 is normal
+}
+
+fn sprite_config_for(kind: BlockKind) -> Option<SpriteConfig> {
+    match kind {
+        BlockKind::Wheat => Some(SpriteConfig { wind_sway: 1.0 }),
+        BlockKind::LongGrass => Some(SpriteConfig { wind_sway: 1.0 }),
+        BlockKind::Flowers => Some(SpriteConfig { wind_sway: 0.3 }),
+        _ => None,
+    }
+}
+
 /// Function executed by worker threads dedicated to chunk meshing.
 fn mesh_worker(
     pos: Vec2<i32>,
@@ -73,16 +86,17 @@ fn mesh_worker(
                         ) + Vec3::new(x, y, z);
 
                         let kind = volume.get(wpos).unwrap_or(&Block::empty()).kind();
-                        match kind {
-                            BlockKind::Wheat | BlockKind::LongGrass | BlockKind::Flowers => {
-                                instances.entry(kind).or_insert_with(|| Vec::new()).push(
-                                    SpriteInstance::new(
+
+                        if let Some(cfg) = sprite_config_for(kind) {
+                            instances.entry(kind).or_insert_with(|| Vec::new()).push(
+                                SpriteInstance::new(
+                                    Mat4::identity().translated_3d(
                                         wpos.map(|e| e as f32) + Vec3::new(0.5, 0.5, 0.0),
-                                        Rgb::broadcast(1.0),
                                     ),
-                                )
-                            }
-                            _ => {}
+                                    Rgb::broadcast(1.0),
+                                    cfg.wind_sway,
+                                ),
+                            );
                         }
                     }
                 }