From a6895f1d5fa63971e063f09e9f7d92de43d4a29f Mon Sep 17 00:00:00 2001
From: Joshua Goins <josh@redstrate.com>
Date: Tue, 4 Oct 2022 09:53:15 -0400
Subject: [PATCH] Add create_surface function to create Vulkan surfaces

---
 src/pc/gfx/gfx_sdl2.c               | 20 ++++++++++++++------
 src/pc/gfx/gfx_window_manager_api.h |  2 ++
 2 files changed, 16 insertions(+), 6 deletions(-)

diff --git a/src/pc/gfx/gfx_sdl2.c b/src/pc/gfx/gfx_sdl2.c
index fed80fb..d4b2604 100644
--- a/src/pc/gfx/gfx_sdl2.c
+++ b/src/pc/gfx/gfx_sdl2.c
@@ -1,7 +1,5 @@
 #include "../compat.h"
 
-#if defined(ENABLE_OPENGL)
-
 #ifdef __MINGW32__
 #define FOR_WINDOWS 1
 #else
@@ -15,6 +13,7 @@
 #include "SDL_opengl.h"
 #else
 #include <SDL2/SDL.h>
+#include <SDL2/SDL_vulkan.h>
 #define GL_GLEXT_PROTOTYPES 1
 #include <SDL2/SDL_opengles2.h>
 #endif
@@ -162,8 +161,9 @@ static void gfx_sdl_init(const char *game_name, const char* gfx_name, bool start
     char title[512];
     int len = sprintf(title, "%s (SDL - %s)", game_name, gfx_name);
 
+    // TODO: decide between opengl/vulkan surface c reation
     wnd = SDL_CreateWindow(title, SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED,
-            window_width, window_height, SDL_WINDOW_OPENGL | SDL_WINDOW_SHOWN | SDL_WINDOW_RESIZABLE);
+            window_width, window_height, SDL_WINDOW_VULKAN | SDL_WINDOW_SHOWN | SDL_WINDOW_RESIZABLE);
 
     if (start_in_fullscreen) {
         set_fullscreen(true, false);
@@ -297,6 +297,15 @@ static double gfx_sdl_get_time(void) {
     return 0.0;
 }
 
+static void* gfx_sdl_create_surface(void* gfx_handle) {
+    VkSurfaceKHR surface = NULL;
+    SDL_Vulkan_CreateSurface(wnd, gfx_handle, &surface);
+
+    printf("Created vulkan surface!\n");
+
+    return surface;
+}
+
 struct GfxWindowManagerAPI gfx_sdl = {
     gfx_sdl_init,
     gfx_sdl_set_keyboard_callbacks,
@@ -308,7 +317,6 @@ struct GfxWindowManagerAPI gfx_sdl = {
     gfx_sdl_start_frame,
     gfx_sdl_swap_buffers_begin,
     gfx_sdl_swap_buffers_end,
-    gfx_sdl_get_time
+    gfx_sdl_get_time,
+    gfx_sdl_create_surface
 };
-
-#endif
diff --git a/src/pc/gfx/gfx_window_manager_api.h b/src/pc/gfx/gfx_window_manager_api.h
index 0dad9a2..3593d2c 100644
--- a/src/pc/gfx/gfx_window_manager_api.h
+++ b/src/pc/gfx/gfx_window_manager_api.h
@@ -5,6 +5,7 @@
 #include <stdbool.h>
 
 struct GfxWindowManagerAPI {
+    // FIXME: revert change for signature, gfx_name can actually be learned from gfx_get_current_rendering_api instead... oops
     void (*init)(const char *game_name, const char* gfx_name, bool start_in_fullscreen);
     void (*set_keyboard_callbacks)(bool (*on_key_down)(int scancode), bool (*on_key_up)(int scancode), void (*on_all_keys_up)(void));
     void (*set_fullscreen_changed_callback)(void (*on_fullscreen_changed)(bool is_now_fullscreen));
@@ -16,6 +17,7 @@ struct GfxWindowManagerAPI {
     void (*swap_buffers_begin)(void);
     void (*swap_buffers_end)(void);
     double (*get_time)(void); // For debug
+    void* (*create_surface)(void* gfx_handle); // for vulkan
 };
 
 #endif