Avoid querying GL_MAX_ARRAY_TEXTURE_LAYERS and GL_MAX_LABEL_LENGTH if it is known at compile time that the GL context is not new enough to have them.

src/renderer_gl.cpp

@@ -2361,7 +2361,7 @@ namespace bgfx { namespace gl
 					;
 
 				g_caps.limits.maxTextureSize     = uint16_t(glGet(GL_MAX_TEXTURE_SIZE) );
-				g_caps.limits.maxTextureLayers   = uint16_t(bx::max(glGet(GL_MAX_ARRAY_TEXTURE_LAYERS), 1) );
+				g_caps.limits.maxTextureLayers   = BX_ENABLED(BGFX_CONFIG_RENDERER_OPENGL >= 31) || BX_ENABLED(BGFX_CONFIG_RENDERER_OPENGLES >= 31) || s_extension[Extension::EXT_texture_array].m_supported ? uint16_t(bx::max(glGet(GL_MAX_ARRAY_TEXTURE_LAYERS), 1) ) : 1;
 				g_caps.limits.maxComputeBindings = computeSupport ? BGFX_MAX_COMPUTE_BINDINGS : 0;
 				g_caps.limits.maxVertexStreams   = BGFX_CONFIG_MAX_VERTEX_STREAMS;
 
@@ -2571,7 +2571,7 @@ namespace bgfx { namespace gl
 					glInsertEventMarker = stubInsertEventMarker;
 				}
 
-				m_maxLabelLen = uint16_t(glGet(GL_MAX_LABEL_LENGTH) );
+				m_maxLabelLen = BX_ENABLED(BGFX_CONFIG_RENDERER_OPENGLES >= 32) || BX_ENABLED(BGFX_CONFIG_RENDERER_OPENGL >= 43) || s_extension[Extension::KHR_debug].m_supported ? uint16_t(glGet(GL_MAX_LABEL_LENGTH) ) : 0;
 
 				setGraphicsDebuggerPresent(s_extension[Extension::EXT_debug_tool].m_supported);