glx: Support non-conformant multisampling fbconfigs.

1 files changed, 16 insertions, 9 deletions

diff --git a/src/api/glx/mod.rs b/src/api/glx/mod.rs
index dcdc21c..317d9ff 100644
--- a/src/api/glx/mod.rs
+++ b/src/api/glx/mod.rs
@@ -360,6 +360,7 @@ unsafe fn choose_fbconfig(glx: &ffi::glx::Glx, extensions: &str, xlib: &ffi::Xli
                           -> Result<(ffi::glx::types::GLXFBConfig, PixelFormat), ()>
 {
     let descriptor = {
+        let mut glx_non_conformant = false;
         let mut out: Vec<c_int> = Vec::with_capacity(37);
 
         out.push(ffi::glx::X_RENDERABLE as c_int);
@@ -382,15 +383,6 @@ unsafe fn choose_fbconfig(glx: &ffi::glx::Glx, extensions: &str, xlib: &ffi::Xli
             out.push(ffi::glx::RGBA_BIT as c_int);
         }
 
-        if let Some(hardware_accelerated) = reqs.hardware_accelerated {
-            out.push(ffi::glx::CONFIG_CAVEAT as c_int);
-            out.push(if hardware_accelerated {
-                ffi::glx::NONE as c_int
-            } else {
-                ffi::glx::SLOW_CONFIG as c_int
-            });
-        }
-
         if let Some(color) = reqs.color_bits {
             out.push(ffi::glx::RED_SIZE as c_int);
             out.push((color / 3) as c_int);
@@ -425,6 +417,7 @@ unsafe fn choose_fbconfig(glx: &ffi::glx::Glx, extensions: &str, xlib: &ffi::Xli
                 out.push(if multisampling == 0 { 0 } else { 1 });
                 out.push(ffi::glx_extra::SAMPLES_ARB as c_int);
                 out.push(multisampling as c_int);
+                glx_non_conformant = true;
             } else {
                 return Err(());
             }
@@ -452,6 +445,20 @@ unsafe fn choose_fbconfig(glx: &ffi::glx::Glx, extensions: &str, xlib: &ffi::Xli
             },
         }
 
+        if let Some(hardware_accelerated) = reqs.hardware_accelerated {
+            let caveat = if hardware_accelerated {
+                ffi::glx::NONE as c_int
+            } else {
+                ffi::glx::SLOW_CONFIG as c_int
+            };
+            out.push(ffi::glx::CONFIG_CAVEAT as c_int);
+            out.push(if glx_non_conformant {
+                caveat | ffi::glx::NON_CONFORMANT_CONFIG as c_int
+            } else {
+                caveat
+            });
+        }
+
         out.push(0);
         out
     };