From dd0f16875fd31f820dd65299f1bdcdbe4f3f8af3 Mon Sep 17 00:00:00 2001
From: hendricks266 <hendricks266@1a8010ca-5511-0410-912e-c29ae57300e0>
Date: Mon, 7 Mar 2016 11:22:02 +0000
Subject: [PATCH] Engine: Add one-bit alpha detection for hightile and model
 skins.

git-svn-id: https://svn.eduke32.com/eduke32@5649 1a8010ca-5511-0410-912e-c29ae57300e0
---
 polymer/eduke32/build/src/mdsprite.c | 6 ++++--
 polymer/eduke32/build/src/polymost.c | 6 ++++--
 2 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/polymer/eduke32/build/src/mdsprite.c b/polymer/eduke32/build/src/mdsprite.c
index 1226868ea..a5c6d0b00 100644
--- a/polymer/eduke32/build/src/mdsprite.c
+++ b/polymer/eduke32/build/src/mdsprite.c
@@ -824,6 +824,7 @@ int32_t mdloadskin(md2model_t *m, int32_t number, int32_t pal, int32_t surf)
         int32_t b = (glinfo.bgra) ? hictinting[pal].b : hictinting[pal].r;
 
         char al = 255;
+        char onebitalpha = 1;
 
         for (int32_t y = 0, j = 0; y < tsiz.y; ++y, j += siz.x)
         {
@@ -834,8 +835,8 @@ int32_t mdloadskin(md2model_t *m, int32_t number, int32_t pal, int32_t surf)
                 tcol.b = cptr[rpptr[x].b];
                 tcol.g = cptr[rpptr[x].g];
                 tcol.r = cptr[rpptr[x].r];
-                tcol.a = rpptr[x].a;
-                al &= rpptr[x].a;
+                al &= tcol.a = rpptr[x].a;
+                onebitalpha &= tcol.a == 0 || tcol.a == 255;
 
                 if (effect & HICTINT_GRAYSCALE)
                 {
@@ -907,6 +908,7 @@ int32_t mdloadskin(md2model_t *m, int32_t number, int32_t pal, int32_t surf)
                       TO_DAMETH_NODOWNSIZE(sk->flags) |
                       TO_DAMETH_NOTEXCOMPRESS(sk->flags) |
                       TO_DAMETH_ARTIMMUNITY(sk->flags) |
+                      (onebitalpha ? DAMETH_ONEBITALPHA : 0) |
                       (hasalpha ? DAMETH_HASALPHA : 0));
 
         Bfree(pic);
diff --git a/polymer/eduke32/build/src/polymost.c b/polymer/eduke32/build/src/polymost.c
index c50fb2ef6..bf9f3dd92 100644
--- a/polymer/eduke32/build/src/polymost.c
+++ b/polymer/eduke32/build/src/polymost.c
@@ -1189,6 +1189,7 @@ int32_t gloadtile_hi(int32_t dapic,int32_t dapalnum, int32_t facen, hicreplctyp
         int32_t b = (glinfo.bgra) ? hictinting[dapalnum].b : hictinting[dapalnum].r;
 
         char al = 255;
+        char onebitalpha = 1;
 
         for (int32_t y = 0, j = 0; y < tsiz.y; ++y, j += siz.x)
         {
@@ -1199,8 +1200,8 @@ int32_t gloadtile_hi(int32_t dapic,int32_t dapalnum, int32_t facen, hicreplctyp
                 tcol.b = cptr[rpptr[x].b];
                 tcol.g = cptr[rpptr[x].g];
                 tcol.r = cptr[rpptr[x].r];
-                tcol.a = rpptr[x].a;
-                al &= rpptr[x].a;
+                al &= tcol.a = rpptr[x].a;
+                onebitalpha &= tcol.a == 0 || tcol.a == 255;
 
                 if (effect & HICTINT_GRAYSCALE)
                 {
@@ -1284,6 +1285,7 @@ int32_t gloadtile_hi(int32_t dapic,int32_t dapalnum, int32_t facen, hicreplctyp
                       TO_DAMETH_NODOWNSIZE(hicr->flags) |
                       TO_DAMETH_NOTEXCOMPRESS(hicr->flags) |
                       TO_DAMETH_ARTIMMUNITY(hicr->flags) |
+                      (onebitalpha ? DAMETH_ONEBITALPHA : 0) |
                       (hasalpha ? DAMETH_HASALPHA : 0));
 
         Bfree(pic);