[core] cache binary shaders on Android

2 files changed, 16 insertions, 0 deletions

diff --git a/src/mbgl/shaders/shaders.cpp b/src/mbgl/shaders/shaders.cpp
index f7f5b4d44f..03d796edba 100644
--- a/src/mbgl/shaders/shaders.cpp
+++ b/src/mbgl/shaders/shaders.cpp
@@ -4,6 +4,7 @@
 
 #include <cassert>
 #include <sstream>
+#include <iomanip>
 
 namespace mbgl {
 namespace shaders {
@@ -29,5 +30,18 @@ std::string vertexSource(const ProgramParameters& parameters, const char* vertex
     return pixelRatioDefine(parameters) + vertexPrelude + vertexSource;
 }
 
+std::string programCachePath(const ProgramParameters& parameters, const char* name) {
+    return parameters.cacheDir + "/com.mapbox.gl.shader." + name +
+           (parameters.overdraw ? ".overdraw.pbf" : ".pbf");
+}
+
+std::string programIdentifier(const std::string& vertexSource, const std::string& fragmentSource) {
+    std::ostringstream ss;
+    ss << std::setfill('0') << std::setw(sizeof(size_t) * 2) << std::hex;
+    ss << std::hash<std::string>()(vertexSource);
+    ss << std::hash<std::string>()(fragmentSource);
+    return ss.str();
+}
+
 } // namespace shaders
 } // namespace mbgl
diff --git a/src/mbgl/shaders/shaders.hpp b/src/mbgl/shaders/shaders.hpp
index e2912c5688..126c64bb9e 100644
--- a/src/mbgl/shaders/shaders.hpp
+++ b/src/mbgl/shaders/shaders.hpp
@@ -10,6 +10,8 @@ namespace shaders {
 
 std::string fragmentSource(const ProgramParameters&, const char* fragmentSource);
 std::string vertexSource(const ProgramParameters&, const char* vertexSource);
+std::string programCachePath(const ProgramParameters&, const char* name);
+std::string programIdentifier(const std::string& vertexSource, const std::string& fragmentSource);
 
 } // namespace shaders
 } // namespace mbgl