1 files changed, 33 insertions, 0 deletions
diff --git a/src/mbgl/shaders/shaders.cpp b/src/mbgl/shaders/shaders.cpp
new file mode 100644
index 0000000000..f7f5b4d44f
--- /dev/null
+++ b/src/mbgl/shaders/shaders.cpp
@@ -0,0 +1,33 @@
+#include <mbgl/shaders/shaders.hpp>
+#include <mbgl/shaders/preludes.hpp>
+#include <mbgl/programs/program_parameters.hpp>
+
+#include <cassert>
+#include <sstream>
+
+namespace mbgl {
+namespace shaders {
+
+static std::string pixelRatioDefine(const ProgramParameters& parameters) {
+    std::ostringstream pixelRatioSS;
+    pixelRatioSS.imbue(std::locale("C"));
+    pixelRatioSS.setf(std::ios_base::showpoint);
+    pixelRatioSS << parameters.pixelRatio;
+    return std::string("#define DEVICE_PIXEL_RATIO ") + pixelRatioSS.str() + "\n";
+}
+
+std::string fragmentSource(const ProgramParameters& parameters, const char* fragmentSource) {
+    std::string source = pixelRatioDefine(parameters) + fragmentPrelude + fragmentSource;
+    if (parameters.overdraw) {
+        assert(source.find("#ifdef OVERDRAW_INSPECTOR") != std::string::npos);
+        source.replace(source.find_first_of('\n'), 1, "\n#define OVERDRAW_INSPECTOR\n");
+    }
+    return source;
+}
+
+std::string vertexSource(const ProgramParameters& parameters, const char* vertexSource) {
+    return pixelRatioDefine(parameters) + vertexPrelude + vertexSource;
+}
+
+} // namespace shaders
+} // namespace mbgl