save code

GPUTrail-main/shaders/trail_draw_pass.gdshader

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+shader_type spatial;
+
+render_mode unshaded,world_vertex_coords,cull_disabled;
+
+uniform sampler2D tex : repeat_enable, source_color, hint_default_white;
+uniform vec2 uv_offset = vec2(0);
+uniform sampler2D color_ramp : repeat_disable, source_color, hint_default_white;
+uniform sampler2D curve : repeat_disable, hint_default_white;
+uniform mat4 emmission_transform = mat4(1);
+uniform int flags = 0;
+/*uniform bool vertical_texture = false;
+uniform bool use_red_as_alpha = false;
+uniform bool billboard = false;
+uniform bool dewiggle = false;
+uniform bool snap_to_transform = false;*/
+
+#define vertical_texture  bool(flags & 1)
+#define use_red_as_alpha  bool(flags & 2)
+#define billboard		  bool(flags & 4)
+#define dewiggle 		  bool(flags & 8)
+#define snap_to_transform bool(flags & 16)
+#define clip_overlaps bool(flags & 32)
+
+
+varying float scale_interp;
+varying vec2 clip;
+varying vec2 mesh_uv;
+void vertex(){
+	mesh_uv = UV;
+
+	mat4 my_model_matrix = MODEL_MATRIX;
+	if(snap_to_transform && INSTANCE_CUSTOM.w==2.0){
+		my_model_matrix[1] = emmission_transform * vec4(0,1,0,1);
+		my_model_matrix[2] = emmission_transform * vec4(0,-1,0,1);
+	}
+
+	if(billboard){
+		vec3 t0 = my_model_matrix[0].xyz-my_model_matrix[3].xyz;
+		vec3 t1 = my_model_matrix[1].xyz-my_model_matrix[2].xyz;
+
+		//vec3 up1 = up0;
+		vec3 up0 = length(t0)*normalize(
+			cross(
+				my_model_matrix[3].xyz-INV_VIEW_MATRIX[3].xyz,
+				//-INV_VIEW_MATRIX[2].xyz,
+				t0));
+		vec3 up1 = length(t1)*normalize(
+			cross(
+				my_model_matrix[2].xyz-INV_VIEW_MATRIX[3].xyz,
+				//-INV_VIEW_MATRIX[2].xyz,
+				t1));
+
+		my_model_matrix[0] = my_model_matrix[3];
+		my_model_matrix[1] = my_model_matrix[2];
+
+		my_model_matrix[0].xyz += up0;
+		my_model_matrix[3].xyz -= up0;
+
+		my_model_matrix[1].xyz += up1;
+		my_model_matrix[2].xyz -= up1;
+	}
+
+	vec3 a = mix(my_model_matrix[1].xyz,my_model_matrix[0].xyz,UV.x);
+	vec3 b = mix(my_model_matrix[2].xyz,my_model_matrix[3].xyz,UV.x);
+
+	UV.x = (UV.x + INSTANCE_CUSTOM.w-1.0 - 2.0)/(INSTANCE_CUSTOM.z-1.0);
+
+	float h = textureLod(curve, vec2(UV.x), 0.0).x;//h=1.0;
+
+	VERTEX = mix(a,b,(UV.y-0.5)*h + 0.5);
+
+	if(dewiggle){
+		scale_interp = h;
+		UV *= scale_interp;
+	}
+
+
+	clip.x = dot(VERTEX - INV_VIEW_MATRIX[3].xyz,cross(my_model_matrix[1].xyz - INV_VIEW_MATRIX[3].xyz,my_model_matrix[2].xyz - INV_VIEW_MATRIX[3].xyz));
+	clip.y = dot(VERTEX - INV_VIEW_MATRIX[3].xyz,cross(my_model_matrix[3].xyz - INV_VIEW_MATRIX[3].xyz,my_model_matrix[0].xyz - INV_VIEW_MATRIX[3].xyz));
+}
+
+void fragment(){
+	//if(billboard && !FRONT_FACING) discard;
+
+	vec2 clip0 = clip;
+	float ababab = clip0.x*clip0.y;
+	//ababab += dFdx(ababab) + dFdy(ababab);
+	//clip0 -= fwidth(clip0);
+	if(clip_overlaps && ababab < 0.0) {
+
+
+
+		if(abs(mesh_uv.x-0.5)<0.5)
+			discard;
+	}
+
+	vec2 base_uv = UV;
+
+	if(dewiggle){
+		base_uv /= scale_interp;
+	}
+
+	vec2 raw_uv = base_uv;
+
+	// Handle UV scrolling
+	base_uv -= uv_offset;
+
+	if(vertical_texture){
+		base_uv = base_uv.yx;
+	}
+
+	vec4 T = textureLod(tex, base_uv, 0.0);
+	ALBEDO = T.rgb;
+	ALPHA = T.a;
+
+	if(use_red_as_alpha){
+		ALBEDO = vec3(1);
+		ALPHA = T.r;
+	}
+
+	T = textureLod(color_ramp, raw_uv, 0.0);
+	ALBEDO *= T.rgb;
+	ALPHA *= T.a;
+
+	//ALBEDO = vec3(UV,0);
+
+	if((base_uv.x < .01) || (.99 < base_uv.x)){
+		//ALBEDO = vec3(1,0,1);
+	}
+}