From ed5d48f136c216e5de04264fc2e1f928109bf9f4 Mon Sep 17 00:00:00 2001
From: ice_iix <ice_ix@protonmail.ch>
Date: Sun, 7 Oct 2018 10:08:24 -0700
Subject: [PATCH] Clamp NUM_SAMPLES glTexImage2DMultisample at GL_MAX_SAMPLES,
 since not all systems support >1 see
 https://github.com/iceiix/steven/issues/5#issuecomment-427669426

---
 src/gl/mod.rs | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/src/gl/mod.rs b/src/gl/mod.rs
index 14a9206..b2e95d9 100644
--- a/src/gl/mod.rs
+++ b/src/gl/mod.rs
@@ -370,8 +370,18 @@ impl Texture {
                     format: TextureFormat,
                     fixed: bool) {
         unsafe {
+            let result: &mut [i32] = &mut [0; 1];
+            gl::GetIntegerv(gl::MAX_SAMPLES, &mut result[0]);
+            let use_samples =
+                if samples > result[0] {
+                    println!("glTexImage2DMultisample: requested {} samples but GL_MAX_SAMPLES is {}", samples, result[0]);
+                    result[0]
+                } else {
+                    samples
+                };
+
             gl::TexImage2DMultisample(target,
-                           samples,
+                           use_samples,
                            format,
                            width as i32,
                            height as i32,