Repe [T3DU] Update - 31f26d171bba0355ce2a77031e3aad4c64dbc7e9

leenkx/Shaders/std/mapping.glsl

@@ -1,41 +1,81 @@
-/*
-https://github.com/JonasFolletete/glsl-triplanar-mapping
+vec4 boxProjection(sampler2D image, vec3 normal, vec3 coord, float blend) {
+	vec3 n = normalize(normal);
+	vec3 N = abs(n);
+	vec4 color1, color2, color3;
 
-MIT License
+	vec2 uv = coord.yz;
+	if (n.x < 0.0) {
+		uv.x = 1.0 - uv.x;
+	}
+	color1 = texture(image, uv);
 
-Copyright (c) 2018 Jonas Folletête
+	uv = coord.xz;
+	if (n.y > 0.0) {
+		uv.x = 1.0 - uv.x;
+	}
+	color2 = texture(image, uv);
 
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
+	uv = vec2(coord.y, 1.0 - coord.x);
+	if (n.z > 0.0) {
+	    uv.x = 1.0 - uv.x;
+	}
+	color3 = texture(image, uv);
 
-The above copyright notice and this permission notice shall be included in all
-copies or substantial portions of the Software.
+	N /= max(dot(N, vec3(1.0)), 1e-8);
 
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-SOFTWARE.
-*/
+	float limit = 0.5 + 0.5 * clamp(blend, 0.0, 1.0);
+	vec3 weight;
+	weight = N.xyz / (N.xyx + N.yzz);
+	weight = clamp((weight - 0.5 * (1.0 - clamp(blend, 0.0, 1.0))) / max(1e-8, clamp(blend, 0.0, 1.0)), 0.0, 1.0);
 
-vec3 blendNormal(vec3 normal) {
-	vec3 blending = abs(normal);
-	blending = normalize(max(blending, 0.00001));
-	blending /= vec3(blending.x + blending.y + blending.z);
-	return blending;
+	if (N.z < (1.0 - limit) * (N.y + N.x)) {
+		weight.z = 0.0;
+		weight.y = 1.0 - weight.x;
+	}
+	else if (N.x < (1.0 - limit) * (N.y + N.z)) {
+		weight.x = 0.0;
+		weight.z = 1.0 - weight.y;
+	}
+	else if (N.y < (1.0 - limit) * (N.x + N.z)) {
+		weight.y = 0.0;
+		weight.x = 1.0 - weight.z;
+	}
+	else {
+		weight = ((2.0 - limit) * N + (limit - 1.0)) / max(1e-8, clamp(blend, 0.0, 1.0));
+	}
+
+	return color1 * weight.x + color2 * weight.y + color3 * weight.z;
 }
 
-vec3 triplanarMapping (sampler2D ImageTexture, vec3 normal, vec3 position) {
-  	vec3 normalBlend = blendNormal(normal);
-	vec3 xColor = texture(ImageTexture, position.yz).rgb;
-	vec3 yColor = texture(ImageTexture, position.xz).rgb;
-	vec3 zColor = texture(ImageTexture, position.xy).rgb;
-
-  return (xColor * normalBlend.x + yColor * normalBlend.y + zColor * normalBlend.z);
+vec2 sphericalMapping(vec3 coord) {
+	vec3 vin = coord * 2.0 - vec3(1.0);
+	float len = length(vin);
+	float v, u;
+	if (len > 0.0) {
+		if (vin.x == 0.0 && vin.y == 0.0) {
+			u = 0.0;
+		}
+		else {
+			u = (1.0 - atan(vin.x, vin.y) / PI) * 0.5;
+		}
+		v = acos(clamp(vin.z / len, -1.0, 1.0)) / PI;
+	}
+	else {
+		v = u = 0.0;
+	}
+	return vec2(u, v);
+}
+
+vec2 tubeMapping(vec3 coord) {
+	vec3 vin = coord * 2.0 - vec3(1.0);
+	float u, v;
+	v = - (vin.z + 1.0) * 0.5;
+	float len = sqrt(vin.x * vin.x + vin.y * vin.y);
+	if (len > 0.0) {
+		u = (1.0 - (atan(vin.x / len, vin.y / len) / PI)) * 0.5;
+	}
+	else {
+		v = u = 0.0;
+	}
+	return vec2(u, v);
 }