From 9a614071253aad219c4aa3c180b286b3f88a72ea Mon Sep 17 00:00:00 2001
From: Flyinghead <raphael.jean@gmail.com>
Date: Wed, 2 Dec 2020 09:52:52 +0100
Subject: [PATCH] android: use dlsym() first to load gles routines

fix attempt for android <= 4.3
Issue #135
---
 core/wsi/gl32funcs.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/core/wsi/gl32funcs.c b/core/wsi/gl32funcs.c
index af5272e5c..a958dbc93 100644
--- a/core/wsi/gl32funcs.c
+++ b/core/wsi/gl32funcs.c
@@ -19,6 +19,9 @@
 #include <stddef.h>
 #include <GLES32/gl32.h>
 #include <EGL/egl.h>
+#if defined(GLES3) && defined(__ANDROID__)
+#include <dlfcn.h>
+#endif
 #include "gl32funcs.h"
 #include "build.h"
 
@@ -26,7 +29,14 @@ void load_gles_symbols()
 {
 #ifdef GLES3
 	for (int i = 0; rglgen_symbol_map[i].sym != NULL; i++)
-		*(void **)rglgen_symbol_map[i].ptr = eglGetProcAddress(rglgen_symbol_map[i].sym);
+	{
+#if defined(__ANDROID__)
+		//try to load via dlsym -- older android (< 4.4?) can't load everything via eglGetProcAddress
+		*(void **)rglgen_symbol_map[i].ptr = (void*)dlsym(RTLD_DEFAULT, rglgen_symbol_map[i].sym);
+		if (*(void **)rglgen_symbol_map[i].ptr == NULL)
+#endif
+			*(void **)rglgen_symbol_map[i].ptr = eglGetProcAddress(rglgen_symbol_map[i].sym);
+	}
 #endif
 }