first commit

Shaders/grass_billboard.gdshader

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+shader_type spatial;
+
+render_mode cull_back;
+
+
+
+global uniform float wind_scale;
+
+global uniform float wind_speed;
+
+global uniform float wind_strength;
+
+global uniform vec3 wind_direction;
+
+global uniform sampler2D wind_noise : filter_linear_mipmap;
+
+
+
+uniform vec4 grass_color : source_color;
+
+uniform sampler2D grass_alpha : source_color;
+
+uniform float grass_bend_amount = 1.0;
+
+uniform float sway_back : hint_range(0.0, 1.0, 0.01) = 1.0;
+
+uniform float light_steps = 3.0;
+
+
+
+varying vec3 node_pos_view;
+
+varying vec3 node_pos_world;
+
+
+
+vec4 CalculateWind(vec4 uv, float speed, vec3 rotate_direction, float uv_scale, float mip_level){
+
+
+
+// Scrolling Wind Noise
+
+vec3 noise_texture = textureLod(wind_noise, (uv.xz * uv_scale) - (speed * wind_direction.xz), mip_level).rgb;
+
+noise_texture = noise_texture * (1. + sway_back) - sway_back;
+
+
+
+// Vertex Displacement
+
+vec4 displace = vec4((noise_texture * rotate_direction) , 0.0);
+
+return displace;
+
+}
+
+
+
+void vertex() {
+
+// Varyings
+
+node_pos_view = NODE_POSITION_VIEW;
+
+node_pos_world = NODE_POSITION_WORLD;
+
+
+
+// Wind Animation
+
+vec4 world_pos = MODEL_MATRIX * vec4(VERTEX, 1.0);
+
+float speed = TIME * wind_speed;
+
+float displace_ammount = wind_strength * grass_bend_amount;
+
+
+vec4 direction = normalize(VIEW_MATRIX * vec4(wind_direction, 0.0)); //rotate the billboard in the direction of the wind
+
+//vec3 direction = vec3(1.0, 0.0, 0.0); //rotate the billboard sideways to the camera
+
+
+
+vec4 displace = CalculateWind(world_pos, speed, direction.xyz, wind_scale, 2.0);
+
+float uv_mask = 1. - UV.y;
+
+displace *= displace_ammount * uv_mask;
+
+
+
+// Billboard
+
+MODELVIEW_MATRIX = VIEW_MATRIX * mat4(
+
+vec4(normalize(cross(vec3(0.0, 1.0, 0.0), MAIN_CAM_INV_VIEW_MATRIX[2].xyz)), 0.0),
+
+vec4(0.0, 1.0, 0.0, 0.0),
+
+vec4(normalize(cross(MAIN_CAM_INV_VIEW_MATRIX[0].xyz, vec3(0.0, 1.0, 0.0))), 0.0),
+
+MODEL_MATRIX[3]);
+
+
+
+// Billboard Keep Scale: Enabled
+
+MODELVIEW_MATRIX = MODELVIEW_MATRIX * mat4(
+
+vec4(length(MODEL_MATRIX[0].xyz), 0.0, 0.0, 0.0),
+
+vec4(0.0, length(MODEL_MATRIX[1].xyz), 0.0, 0.0),
+
+vec4(0.0, 0.0, length(MODEL_MATRIX[2].xyz), 0.0),
+
+vec4(0.0, 0.0, 0.0, 1.0));
+
+MODELVIEW_NORMAL_MATRIX = mat3(MODELVIEW_MATRIX);
+
+
+
+VERTEX += displace.rgb;
+
+}
+
+
+
+void fragment() {
+
+// Color Variation
+
+float noise = texture(wind_noise, node_pos_world.xz * 0.04).r;
+
+noise = (noise + 2.5) / 3.5;
+
+noise = ceil(noise * 5.0) / 5.0;
+
+
+
+ALBEDO = grass_color.rgb * noise;
+
+ALPHA = texture(grass_alpha, UV).r;
+
+ALPHA_SCISSOR_THRESHOLD = 0.75;
+
+
+
+SPECULAR = 0.0;
+
+ROUGHNESS = 0.0; // roughness is being u sed as a mask for the outline
+
+LIGHT_VERTEX = node_pos_view; // shade the entire mesh based on the object position(pivot) instead of the pixel position
+
+}
+
+
+
+void light(){
+
+//Diffuse lighting
+
+float light = clamp(dot(NORMAL, LIGHT), 0.0, 1.0);
+
+DIFFUSE_LIGHT += light * (LIGHT_COLOR / PI) * ATTENUATION;
+
+}