fix cube faces rendering order (#22)

* fix cube faces rendering order

Signed-off-by: Glease <4586901+Glease@users.noreply.github.com>

* spotless

Signed-off-by: Glease <4586901+Glease@users.noreply.github.com>

* address review

Signed-off-by: Glease <4586901+Glease@users.noreply.github.com>

---------

Signed-off-by: Glease <4586901+Glease@users.noreply.github.com>

LICENSE.txt

@@ -0,0 +1,165 @@
+                   GNU LESSER GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+
+  This version of the GNU Lesser General Public License incorporates
+the terms and conditions of version 3 of the GNU General Public
+License, supplemented by the additional permissions listed below.
+
+  0. Additional Definitions.
+
+  As used herein, "this License" refers to version 3 of the GNU Lesser
+General Public License, and the "GNU GPL" refers to version 3 of the GNU
+General Public License.
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+other than an Application or a Combined Work as defined below.
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+without being bound by section 3 of the GNU GPL.
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README.md

@@ -32,3 +32,5 @@ The project is developed using IDEA. Please manually configure the build to not
 Due to me adding in ItemStackMap, which was derived from code from CodeChicken's LGPL mod NEI. This mod is effectively considered
 licensed under LGPL in its entirety since commit ebef584b8c518f8202cfe0984fb28a6d23e52b3d or any squash commit containing it, e.g.
 609e50428ee4e293f65f67f554a70b9fcfae97c4.
+
+Note while the LICENSE.txt is added by a much later commit, all code on previous commits are covered by this as well.

src/main/java/com/gtnewhorizon/structurelib/ClientProxy.java

@@ -46,7 +46,6 @@ public class ClientProxy extends CommonProxy {
      */
     private static final List<HintGroup> allGroups = new ArrayList<>();
 
-    public static int HOLOGRAM_LIFETIME = 200;
     /**
      * Current batch of hints. Belongs to the same logical multiblock.
      */
@@ -335,26 +334,32 @@ public class ClientProxy extends CommonProxy {
             double X = (x - eyeXint) + 0.25;
             double Y = (y - eyeYint) + 0.25;
             double Z = (z - eyeZint) + 0.25;
+            double worldX = x + 0.25;
+            double worldY = y + 0.25;
+            double worldZ = z + 0.25;
 
-            for (int i = 0; i < 6; i++) {
-                if (icons[i] == null) continue;
+            // this rendering code is independently written by glee8e on July 10th, 2023
+            // and is released as part of StructureLib under LGPL terms, just like everything else in this project
+            // cube is a very special model. its facings can be rendered correctly by viewer distance without using
+            // surface normals and view vector
+            // here we do a 2 pass render.
+            // first pass we draw obstructed faces (i.e. faces that are further away from player)
+            // second pass we draw unobstructed faces
+            for (int j = 0; j < 2; j++) {
+                boolean unobstructedPass = j == 1;
+                for (int i = 0; i < 6; i++) {
+                    if (icons[i] == null) continue;
 
-                markTextureUsed(icons[i]);
+                    markTextureUsed(icons[i]);
 
-                double u = icons[i].getMinU();
-                double U = icons[i].getMaxU();
-                double v = icons[i].getMinV();
-                double V = icons[i].getMaxV();
-
-                // cube is a very special model. its facings can be rendered correctly by viewer distance without using
-                // surface normals and view vector
-                // here we do a 2 pass render.
-                // first pass we draw obstructed faces (i.e. faces that are further away from player)
-                // second pass we draw unobstructed faces
-                for (int j = 0; j < 2; j++) {
+                    double u = icons[i].getMinU();
+                    double U = icons[i].getMaxU();
+                    double v = icons[i].getMinV();
+                    double V = icons[i].getMaxV();
                     switch (i) { // {DOWN, UP, NORTH, SOUTH, WEST, EAST}
                         case 0:
-                            if ((Y >= eyeY) != (j == 1)) continue;
+                            // all these ifs is in form if ((is face unobstructed) != (is in unobstructred pass))
+                            if ((worldY >= eyeY) != unobstructedPass) continue;
                             tes.setNormal(0, -1, 0);
                             tes.addVertexWithUV(X, Y, Z + size, u, V);
                             tes.addVertexWithUV(X, Y, Z, u, v);
@@ -364,7 +369,7 @@ public class ClientProxy extends CommonProxy {
                             tes.addVertexWithUV(X, Y, Z + size, u, V);
                             break;
                         case 1:
-                            if ((Y + size <= eyeY) != (j == 1)) continue;
+                            if ((worldY + size <= eyeY) != unobstructedPass) continue;
                             tes.setNormal(0, 1, 0);
                             tes.addVertexWithUV(X, Y + size, Z, u, v);
                             tes.addVertexWithUV(X, Y + size, Z + size, u, V);
@@ -374,7 +379,7 @@ public class ClientProxy extends CommonProxy {
                             tes.addVertexWithUV(X, Y + size, Z, u, v);
                             break;
                         case 2:
-                            if ((Z >= eyeZ) != (j == 1)) continue;
+                            if ((worldZ >= eyeZ) != unobstructedPass) continue;
                             tes.setNormal(0, 0, -1);
                             tes.addVertexWithUV(X, Y, Z, U, V);
                             tes.addVertexWithUV(X, Y + size, Z, U, v);
@@ -384,7 +389,7 @@ public class ClientProxy extends CommonProxy {
                             tes.addVertexWithUV(X, Y, Z, U, V);
                             break;
                         case 3:
-                            if ((Z <= eyeZ) != (j == 1)) continue;
+                            if ((worldZ + size <= eyeZ) != unobstructedPass) continue;
                             tes.setNormal(0, 0, 1);
                             tes.addVertexWithUV(X + size, Y, Z + size, U, V);
                             tes.addVertexWithUV(X + size, Y + size, Z + size, U, v);
@@ -394,7 +399,7 @@ public class ClientProxy extends CommonProxy {
                             tes.addVertexWithUV(X + size, Y, Z + size, U, V);
                             break;
                         case 4:
-                            if ((X >= eyeX) != (j == 1)) continue;
+                            if ((worldX >= eyeX) != unobstructedPass) continue;
                             tes.setNormal(-1, 0, 0);
                             tes.addVertexWithUV(X, Y, Z + size, U, V);
                             tes.addVertexWithUV(X, Y + size, Z + size, U, v);
@@ -404,7 +409,7 @@ public class ClientProxy extends CommonProxy {
                             tes.addVertexWithUV(X, Y, Z + size, U, V);
                             break;
                         case 5:
-                            if ((X + size <= eyeX) != (j == 1)) continue;
+                            if ((worldX + size <= eyeX) != unobstructedPass) continue;
                             tes.setNormal(1, 0, 0);
                             tes.addVertexWithUV(X + size, Y, Z, U, V);
                             tes.addVertexWithUV(X + size, Y + size, Z, U, v);
@@ -550,7 +555,6 @@ public class ClientProxy extends CommonProxy {
                     tes.draw();
                     tes.startDrawing(GL11.GL_TRIANGLES);
                 }
-                // TODO verify if we need to add eyeHeight
                 hint.draw(tes, d0, d1, d2, i0, i1, i2);
             }
             p.endStartSection("Draw");