1 files changed, 69 insertions, 0 deletions
diff --git a/themes/src/shader_fetcher.cpp b/themes/src/shader_fetcher.cpp
new file mode 100644
index 0000000..19ef983
--- /dev/null
+++ b/themes/src/shader_fetcher.cpp
@@ -0,0 +1,69 @@
+#include "shader_fetcher.hpp"
+#include "types.h"
+#include <cstdio>
+#include <emscripten/fetch.h>
+
+struct FetchtimeData {
+    ShaderFetchResult result;
+    ShaderFetchPaths paths_data;
+    void (*cb)(ShaderFetchResult*);
+};
+
+void on_failure(emscripten_fetch_t *fetch) {
+    FetchtimeData* ftd = (FetchtimeData*)fetch->userData;
+	printf("Downloading %s failed, HTTP failure status code: %d.\n", fetch->url, fetch->status);
+	emscripten_fetch_close(fetch); // Also free data on failure.
+    ftd->cb(nullptr);
+}
+
+void on_fragment_shader(emscripten_fetch_t *fetch) {
+    FetchtimeData* ftd = (FetchtimeData*)fetch->userData;
+	printf("Finished downloading %llu bytes from URL %s.\n", fetch->numBytes, fetch->url);
+	const i32 len = fetch->numBytes;
+	char* data = (char*)fetch->data;
+	data[len - 1] = '\0';
+    ftd->result.fragment = data;
+	emscripten_fetch_close(fetch); // Free data associated with the fetch.
+
+    ftd->cb(&ftd->result);
+    delete ftd;
+}
+
+void on_vertex_shader(emscripten_fetch_t *fetch) {
+
+    FetchtimeData* ftd = (FetchtimeData*)fetch->userData;
+	printf("Finished downloading %llu bytes from URL %s.\n", fetch->numBytes, fetch->url);
+	const i32 len = fetch->numBytes;
+	char* data = (char*)fetch->data;
+	data[len - 1] = '\0';
+
+    ftd->result.vertex = data;
+	emscripten_fetch_close(fetch); // Free data associated with the fetch.
+
+    // Fetch fragment shader next
+    emscripten_fetch_attr_t attr;
+	emscripten_fetch_attr_init(&attr);
+	strcpy(attr.requestMethod, "GET");
+	attr.attributes = EMSCRIPTEN_FETCH_LOAD_TO_MEMORY;
+	attr.onsuccess = on_fragment_shader;
+	attr.onerror = on_failure;
+	auto* request = emscripten_fetch(&attr, ftd->paths_data.fragment);
+	request->userData = ftd;
+}
+
+void fetch_shader(ShaderFetchPaths paths, void (*cb)(ShaderFetchResult*), void* user_data) {
+    FetchtimeData* ftd = new FetchtimeData();
+    ftd->cb = cb;
+    ftd->paths_data = paths;
+    ftd->result.user_data = user_data;
+
+    // Fetch vertex shader
+    emscripten_fetch_attr_t attr;
+	emscripten_fetch_attr_init(&attr);
+	strcpy(attr.requestMethod, "GET");
+	attr.attributes = EMSCRIPTEN_FETCH_LOAD_TO_MEMORY;
+	attr.onsuccess = on_vertex_shader;
+	attr.onerror = on_failure;
+	auto* request = emscripten_fetch(&attr, paths.vertex);
+	request->userData = ftd;
+}
+\ No newline at end of file