2025-07-01

2026-03-17 14:30:01 -06:00
parent f9a22056dd
commit 62b5978595
4579 changed files with 1257472 additions and 0 deletions
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+/*
+Copyright (C) 2023 CG Cookie
+http://cgcookie.com
+hello@cgcookie.com
+
+Created by Jonathan Denning
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+struct Options {
+    mat4 uMVPMatrix;
+    float uInOut;
+}
+
+uniform Options options;
+
+in vec4 vPos;
+in vec4 vFrom;
+in vec4 vInColor;
+in vec4 vOutColor;
+
+/////////////////////////////////////////////////////////////////////////
+// vertex shader
+
+#version 330
+
+out float aRot;
+out vec4 aInColor;
+out vec4 aOutColor;
+
+float angle(vec2 d) { return atan(d.y, d.x); }
+
+void main() {
+    vec4 p0 = options.uMVPMatrix * vFrom;
+    vec4 p1 = options.uMVPMatrix * vPos;
+    gl_Position = p1;
+    aRot = angle((p1.xy / p1.w) - (p0.xy / p0.w));
+    aInColor = vInColor;
+    aOutColor = vOutColor;
+}
+
+
+/////////////////////////////////////////////////////////////////////////
+// fragment shader
+
+#version 330
+
+in float aRot;
+in vec4 aInColor;
+in vec4 aOutColor;
+
+out vec4 outColor;
+
+float alpha(vec2 dir) {
+    vec2 d0 = dir - vec2(1,1);
+    vec2 d1 = dir - vec2(1,-1);
+
+    float d0v = -d0.x/2.0 - d0.y;
+    float d1v = -d1.x/2.0 + d1.y;
+    float dv0 = length(dir);
+    float dv1 = distance(dir, vec2(-2,0));
+
+    if(d0v < 1.0 || d1v < 1.0) return -1.0;
+    // if(dv0 > 1.0) return -1.0;
+    if(dv1 < 1.3) return -1.0;
+
+    if(d0v - 1.0 < (1.0 - options.uInOut) || d1v - 1.0 < (1.0 - options.uInOut)) return 0.0;
+    //if(dv0 > options.uInOut) return 0.0;
+    if(dv1 - 1.3 < (1.0 - options.uInOut)) return 0.0;
+    return 1.0;
+}
+
+void main() {
+    vec2 d = 2.0 * (gl_PointCoord - vec2(0.5, 0.5));
+    vec2 dr = vec2(cos(aRot)*d.x - sin(aRot)*d.y, sin(aRot)*d.x + cos(aRot)*d.y);
+    float a = alpha(dr);
+    if(a < 0.0) { discard; return; }
+    outColor = mix(aOutColor, aInColor, a);
+    // https://wiki.blender.org/wiki/Reference/Release_Notes/2.83/Python_API
+    outColor = blender_srgb_to_framebuffer_space(outColor);
+}