save code

2025-11-28 18:10:23 +08:00
commit fee064c3f0
49 changed files with 64353 additions and 0 deletions
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+#ifdef GPU_TRAIL
+//#define GPU_TRAIL
+
+// TODO make optional
+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 missing_parens(){}
+
+#define PREPARE_TRAIL { \
+	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 up0 = length(t0)*normalize( \
+			cross( \
+				my_model_matrix[3].xyz-INV_VIEW_MATRIX[3].xyz, \
+				t0)); \
+		vec3 up1 = length(t1)*normalize( \
+			cross( \
+				my_model_matrix[2].xyz-INV_VIEW_MATRIX[3].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; \
+	 \
+	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)); \
+} missing_parens
+
+#define PREPARE_TRAIL_TEXTURES { \
+	vec2 clip0 = clip; \
+	float ababab = clip0.x*clip0.y; \
+	 \
+	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; \
+	 \
+	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; \
+} missing_parens
+
+#endif /*GPU_TRAIL*/