diva, fgo: added gfx, close #46

gfxhook/gl.c

@@ -0,0 +1,77 @@
+#include <windows.h>
+
+#include <assert.h>
+#include <stdlib.h>
+
+#include "gfxhook/gfx.h"
+#include "gfxhook/gl.h"
+
+#include "hook/table.h"
+
+#include "hooklib/dll.h"
+
+#include "util/dprintf.h"
+
+/* Hook functions */
+
+static void WINAPI hook_glutFullScreen(void);
+static void WINAPI hook_glutInitDisplayMode(unsigned int mode);
+
+/* Link pointers */
+
+static void (WINAPI *next_glutFullScreen)(void);
+static void (WINAPI *next_glutInitDisplayMode)(unsigned int mode);
+
+static struct gfx_config gfx_config;
+
+static const struct hook_symbol glut_hooks[] = {
+    {
+        .name = "glutFullScreen",
+        .patch = hook_glutFullScreen,
+        .link = (void **) &next_glutFullScreen,
+    }, {
+        .name = "glutInitDisplayMode",
+        .patch = hook_glutInitDisplayMode,
+        .link = (void **) &next_glutInitDisplayMode,
+    },
+};
+
+void gfx_gl_hook_init(const struct gfx_config *cfg, HINSTANCE self)
+{
+    assert(cfg != NULL);
+
+    if (!cfg->enable) {
+        return;
+    }
+
+    memcpy(&gfx_config, cfg, sizeof(*cfg));
+    hook_table_apply(NULL, "glut32.dll", glut_hooks, _countof(glut_hooks));
+
+    if (self != NULL) {
+        dll_hook_push(self, L"glut32.dll");
+    }
+}
+
+static void WINAPI hook_glutFullScreen(void)
+{
+    dprintf("Gfx: glutFullScreen hook hit\n");
+
+    if (gfx_config.windowed) {
+        return;
+    }
+
+    return next_glutFullScreen();
+}
+
+static void WINAPI hook_glutInitDisplayMode(unsigned int mode)
+{
+    dprintf("Gfx: glutInitDisplayMode hook hit\n");
+
+    // GLUT adds a frame when going windowed
+    if (gfx_config.windowed && !gfx_config.framed) {
+        // GLUT_BORDERLESS
+        mode |= 0x0800;
+    }
+
+    return next_glutInitDisplayMode(mode);
+}