add debug markers for easier gl debugging

include/llmr/map/source.hpp

@@ -53,7 +53,7 @@ private:
 
     Type type;
     std::list<uint32_t> zooms;
-    const char *url;
+    const std::string url;
     uint32_t tile_size;
     uint32_t min_zoom;
     uint32_t max_zoom;

include/llmr/platform/gl.hpp

@@ -1,6 +1,8 @@
 #ifndef LLMR_RENDERER_GL
 #define LLMR_RENDERER_GL
 
+#include <string>
+
 #ifdef NVIDIA
     #include <GLES2/gl2.h>
     #include <GLES2/gl2ext.h>
@@ -33,6 +35,28 @@
     #include <GL/glext.h>
 #endif
 
+namespace llmr {
+namespace gl {
+// Debug group markers, useful for debuggin on iOS
+inline void start_group(const std::string &str) {
+#if GL_EXT_debug_marker
+    glPushGroupMarkerEXT(0, str.c_str());
+#endif
+}
+
+inline void end_group() {
+#if GL_EXT_debug_marker
+    glPopGroupMarkerEXT();
+#endif
+}
+
+struct group {
+    inline group(const std::string &str) { start_group(str); }
+    ~group() { end_group(); };
+};
+}
+}
+
 #ifdef GL_ES_VERSION_2_0
     #define glClearDepth glClearDepthf
     #define glDepthRange glDepthRangef

include/llmr/util/string.hpp

@@ -6,13 +6,18 @@
 namespace llmr {
 namespace util {
 
-template<typename... Args>
+template<size_t max, typename... Args>
 inline std::string sprintf(const char *msg, Args... args) {
-    char res[1024];
+    char res[max];
     int len = snprintf(res, sizeof(res), msg, args...);
     return std::string(res, len);
 }
 
+template<size_t max, typename... Args>
+inline std::string sprintf(const std::string &msg, Args... args) {
+    return sprintf<max>(msg.c_str(), args...);
+}
+
 }
 }