From cde0abd18d75f1a6cc2863f938c0d3d927e506a4 Mon Sep 17 00:00:00 2001
From: Luke Benstead <kazade@gmail.com>
Date: Sun, 23 May 2021 13:15:07 +0100
Subject: [PATCH] Force the correct depth and blend modes with PT polys

---
 GL/draw.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/GL/draw.c b/GL/draw.c
index 99a668d..d130336 100644
--- a/GL/draw.c
+++ b/GL/draw.c
@@ -1133,6 +1133,13 @@ GL_FORCE_INLINE void push(PolyHeader* header, GLboolean multiTextureHeader, Poly
     PolyContext cxt = *_glGetPVRContext();
     cxt.list_type = activePolyList->list_type;
 
+    /* Punch-through polys require fixed blending and depth modes */
+    if(cxt.list_type == GPU_LIST_PT_POLY) {
+        cxt.blend.src = GPU_BLEND_SRCALPHA;
+        cxt.blend.dst = GPU_BLEND_INVSRCALPHA;
+        cxt.depth.comparison = GPU_DEPTHCMP_LEQUAL;
+    }
+
     _glUpdatePVRTextureContext(&cxt, textureUnit);
 
     if(multiTextureHeader) {