1 files changed, 46 insertions, 0 deletions
diff --git a/themes/src/WebglContext.cpp b/themes/src/WebglContext.cpp
new file mode 100644
index 0000000..df49c2d
--- /dev/null
+++ b/themes/src/WebglContext.cpp
@@ -0,0 +1,46 @@
+#include "WebglContext.h"
+#include <cstdio>
+
+
+EM_BOOL onResize(int eventType, const EmscriptenUiEvent *uiEvent, void *userData) {
+	WebglContext* context = (WebglContext*)userData;
+
+    f64 inWidth, inHeight;
+    emscripten_get_element_css_size(context->query, &inWidth, &inHeight);
+
+    context->width = static_cast<f32>(inWidth);
+    context->height = static_cast<f32>(inHeight);
+
+    return true;
+}
+
+void WebglContext::init(const char* inQuery) {
+    strcpy(query, inQuery);
+    f64 inWidth, inHeight;
+    emscripten_get_element_css_size(query, &inWidth, &inHeight);
+    width = static_cast<f32>(inWidth);
+    height = static_cast<f32>(inHeight);
+    emscripten_set_canvas_element_size( query, width, height);
+    
+    EmscriptenWebGLContextAttributes attrs;
+    emscripten_webgl_init_context_attributes(&attrs);
+
+    attrs.enableExtensionsByDefault = 1;
+    attrs.majorVersion = 3;
+    attrs.minorVersion = 0;
+
+    context = emscripten_webgl_create_context(query, &attrs);
+    makeCurrentContext();
+
+    glClearColor(0, 0, 0, 0.0f);
+
+    emscripten_set_resize_callback(EMSCRIPTEN_EVENT_TARGET_WINDOW, this, false, onResize);
+};
+
+void WebglContext::makeCurrentContext() {
+    emscripten_webgl_make_context_current(context);
+};
+
+void WebglContext::destroy() {
+    emscripten_webgl_destroy_context(context);
+}