From ec12bab1acce951976a152e2fd9f2110a327285e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Konstantin=20K=C3=A4fer?= <mail@kkaefer.com>
Date: Wed, 11 Apr 2018 13:27:21 +0200
Subject: [core] warn about using too many data driven properties instead of
 crashing

Instead, we're printing a warning message and won't bind the attributes beyond the limit. This will cause rendering errors, but it's still better than crashing.
---
 src/mbgl/renderer/render_layer.cpp | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

(limited to 'src/mbgl/renderer/render_layer.cpp')

diff --git a/src/mbgl/renderer/render_layer.cpp b/src/mbgl/renderer/render_layer.cpp
index bcdc175f14..a667d5837e 100644
--- a/src/mbgl/renderer/render_layer.cpp
+++ b/src/mbgl/renderer/render_layer.cpp
@@ -9,8 +9,10 @@
 #include <mbgl/renderer/layers/render_raster_layer.hpp>
 #include <mbgl/renderer/layers/render_symbol_layer.hpp>
 #include <mbgl/renderer/layers/render_heatmap_layer.hpp>
+#include <mbgl/renderer/paint_parameters.hpp>
 #include <mbgl/style/types.hpp>
 #include <mbgl/renderer/render_tile.hpp>
+#include <mbgl/util/logging.hpp>
 
 namespace mbgl {
 
@@ -73,5 +75,32 @@ void RenderLayer::setRenderTiles(std::vector<std::reference_wrapper<RenderTile>>
     renderTiles = std::move(tiles);
 }
 
+void RenderLayer::checkRenderability(const PaintParameters& parameters,
+                                     const uint32_t activeBindingCount) {
+    // Only warn once for every layer.
+    if (hasRenderFailures) {
+        return;
+    }
+
+    if (activeBindingCount > parameters.context.maximumVertexBindingCount) {
+        Log::Error(Event::OpenGL,
+                   "The layer '%s' uses more data-driven properties than the current device "
+                   "supports, and will have rendering errors. To ensure compatibility with this "
+                   "device, use %d fewer data driven properties in this layer.",
+                   getID().c_str(),
+                   activeBindingCount - parameters.context.minimumRequiredVertexBindingCount);
+        hasRenderFailures = true;
+    } else if (activeBindingCount > parameters.context.minimumRequiredVertexBindingCount) {
+        Log::Error(Event::OpenGL,
+                   "The layer '%s' uses more data-driven properties than some devices may support. "
+                   "Though it will render correctly on this device, it may have rendering errors "
+                   "on other devices. To ensure compatibility with all devices, use %d fewer "
+                   "data-driven properties in this layer.",
+                   getID().c_str(),
+                   activeBindingCount - parameters.context.minimumRequiredVertexBindingCount);
+        hasRenderFailures = true;
+    }
+}
+
 } //namespace mbgl
 
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