Post Game jam commit

shaders/grass_shader.gdshader

@@ -0,0 +1,39 @@
+shader_type canvas_item;
+
+uniform float wind_speed = 1.0;
+uniform float wind_strength = 10.0;
+uniform sampler2D noise_tex : repeat_enable;
+uniform vec2 frame_size = vec2(16.0, 16.0);
+uniform vec2 sheet_size = vec2(64.0, 16.0);
+
+void vertex() {
+    float rnd_offset = INSTANCE_CUSTOM.r;
+    float tex_idx = INSTANCE_CUSTOM.g;
+    float state = INSTANCE_CUSTOM.b;
+    
+    if (state < 0.5) { 
+        vec2 world_pos = (MODEL_MATRIX * vec4(VERTEX, 0.0, 1.0)).xy;
+        float noise = texture(noise_tex, world_pos * 0.005 + vec2(TIME * wind_speed * 0.1)).r;
+        
+        if (VERTEX.y < 0.0) {
+            VERTEX.x += sin(TIME * wind_speed) * (wind_strength * noise) + rnd_offset;
+        }
+    }
+    
+    if (state > 0.5) {
+        VERTEX.y *= 0.2;
+        VERTEX.y += 5.0;
+    }
+
+    float columns = sheet_size.x / frame_size.x;
+    float col_idx = mod(tex_idx, columns);
+    
+    UV.x = (UV.x / columns) + (col_idx / columns);
+}
+
+void fragment() {
+	vec2 uv = vec2(UV.x, 1.0 - UV.y);
+	vec4 col = texture(TEXTURE, uv);
+	vec3 glow_col = col.xyz * 2.;
+    COLOR = vec4(glow_col, col.w);
+}