diff --git a/src/gfx_apis/gl.rs b/src/gfx_apis/gl.rs
index 0fd8ed71..68d1f1c6 100644
--- a/src/gfx_apis/gl.rs
+++ b/src/gfx_apis/gl.rs
@@ -266,6 +266,7 @@ fn run_ops(fb: &Framebuffer, ops: &[GfxApiOpt]) -> Option<SyncFile> {
                     i += 1;
                 }
                 if let Some(color) = color {
+                    log::info!("fill with color {:?}", color);
                     fill_boxes3(&fb.ctx, triangles, &color);
                 }
             }
diff --git a/src/gfx_apis/gl/gl/sys.rs b/src/gfx_apis/gl/gl/sys.rs
index afbaec72..8688b292 100644
--- a/src/gfx_apis/gl/gl/sys.rs
+++ b/src/gfx_apis/gl/gl/sys.rs
@@ -21,6 +21,7 @@ pub const GL_COLOR_ATTACHMENT0: GLenum = 0x8CE0;
 pub const GL_COLOR_BUFFER_BIT: GLbitfield = 0x00004000;
 pub const GL_COMPILE_STATUS: GLenum = 0x8B81;
 pub const GL_EXTENSIONS: GLenum = 0x1F03;
+pub const GL_RENDERER: GLenum = 0x1F01;
 pub const GL_FALSE: GLboolean = 0;
 pub const GL_FLOAT: GLenum = 0x1406;
 pub const GL_FRAGMENT_SHADER: GLenum = 0x8B30;
diff --git a/src/gfx_apis/gl/renderer/context.rs b/src/gfx_apis/gl/renderer/context.rs
index 4b31edba..fb672a8a 100644
--- a/src/gfx_apis/gl/renderer/context.rs
+++ b/src/gfx_apis/gl/renderer/context.rs
@@ -12,6 +12,7 @@ use {
                 program::GlProgram, render_buffer::GlRenderBuffer, sys::GLint, texture::GlTexture,
             },
             renderer::{framebuffer::Framebuffer, image::Image},
+            sys::GL_RENDERER,
             GfxGlState, RenderError, Texture,
         },
         video::{
@@ -21,11 +22,12 @@ use {
         },
     },
     ahash::AHashMap,
+    bstr::ByteSlice,
     enum_map::{enum_map, Enum, EnumMap},
     jay_config::video::GfxApi,
     std::{
         cell::{Cell, RefCell},
-        ffi::CString,
+        ffi::{CStr, CString},
         fmt::{Debug, Formatter},
         rc::Rc,
     },
@@ -148,6 +150,11 @@ impl GlRenderContext {
         } else {
             None
         };
+        {
+            let name = (ctx.dpy.gles.glGetString)(GL_RENDERER);
+            let name = CStr::from_ptr(name as _).to_bytes();
+            log::info!("gl renderer: {}", name.as_bstr());
+        }
         let fill_prog = GlProgram::from_shaders(
             ctx,
             include_str!("../shaders/fill.vert.glsl"),