From 63aa2ec47c2cabf1ba85dc79161bb2c383144264 Mon Sep 17 00:00:00 2001
From: Luke Benstead <kazade@gmail.com>
Date: Sun, 23 Jul 2017 20:47:31 +0100
Subject: [PATCH] Check that textures are a power of two early rather than
 dying in PVR code

---
 gl-texture.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/gl-texture.c b/gl-texture.c
index b22abf5..d3b4b49 100644
--- a/gl-texture.c
+++ b/gl-texture.c
@@ -242,6 +242,18 @@ void APIENTRY glTexImage2D(GLenum target, GLint level, GLint internalFormat,
         if(internalFormat != GL_RGBA)
             _glKosThrowError(GL_INVALID_VALUE, "glTexImage2D");
 
+    GLint w = width;
+    if(w == 0 || (w & -w) != w) {
+        /* Width is not a power of two. Must be!*/
+        _glKosThrowError(GL_INVALID_VALUE, "glTexImage2D");
+    }
+
+    GLint h = height;
+    if(h == 0 || (h & -h) != h) {
+        /* height is not a power of two. Must be!*/
+        _glKosThrowError(GL_INVALID_VALUE, "glTexImage2D");
+    }
+
     if(level < 0)
         _glKosThrowError(GL_INVALID_VALUE, "glTexImage2D");