Add Linux taskbar icon (#6)

src/main/main.cpp

@@ -30,6 +30,9 @@
 #include "SDL_syswm.h"
 #endif
 
+#define STB_IMAGE_IMPLEMENTATION
+#include "../../lib/rt64/src/contrib/stb/stb_image.h"
+
 extern "C" void init();
 /*extern "C"*/ void start(ultramodern::WindowHandle window_handle, const ultramodern::audio_callbacks_t* audio_callbacks, const ultramodern::input_callbacks_t* input_callbacks);
 
@@ -55,10 +58,60 @@ ultramodern::gfx_callbacks_t::gfx_data_t create_gfx() {
     return {};
 }
 
+#if defined(__linux__)
+bool SetImageAsIcon(const char* filename, SDL_Window* window)
+{
+    // Read data
+    int width, height, bytesPerPixel;
+    void* data = stbi_load(filename, &width, &height, &bytesPerPixel, 4);
+
+    // Calculate pitch
+    int pitch;
+    pitch = width * 4;
+    pitch = (pitch + 3) & ~3;
+
+    // Setup relevance bitmask
+    int Rmask, Gmask, Bmask, Amask;
+
+#if SDL_BYTEORDER == SDL_LIL_ENDIAN
+    Rmask = 0x000000FF;
+    Gmask = 0x0000FF00;
+    Bmask = 0x00FF0000;
+    Amask = 0xFF000000;
+#else
+    Rmask = 0xFF000000;
+    Gmask = 0x00FF0000;
+    Bmask = 0x0000FF00;
+    Amask = 0x000000FF;
+#endif
+
+    SDL_Surface* surface;
+    if (data != NULL) {
+        surface = SDL_CreateRGBSurfaceFrom(data, width, height, 32, pitch, Rmask, Gmask,
+                            Bmask, Amask);
+    }
+
+    if (surface == NULL) {   
+        if (data != NULL) {
+            stbi_image_free(data);
+        }
+        return false;
+	} else {
+        SDL_SetWindowIcon(window,surface);
+        SDL_FreeSurface(surface);
+        stbi_image_free(data);
+        return true;
+    }
+}
+#endif
+
 SDL_Window* window;
 
 ultramodern::WindowHandle create_window(ultramodern::gfx_callbacks_t::gfx_data_t) {
     window = SDL_CreateWindow("Zelda 64: Recompiled", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 1600, 960, SDL_WINDOW_RESIZABLE );
+#if defined(__linux__)
+    SetImageAsIcon("icons/512.png",window);
+#endif
 
     if (window == nullptr) {
         exit_error("Failed to create window: %s\n", SDL_GetError());