From e57daa001cc74682cdb905d8e0c6c8c3a2c29372 Mon Sep 17 00:00:00 2001
From: dec05eba <dec05eba@protonmail.com>
Date: Sun, 10 Oct 2021 10:59:43 +0200
Subject: Initial commit, skeleton

---
 src/glx.c    | 39 +++++++++++++++++++++++++++++++++++++++
 src/mgl.c    | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
 src/window.c | 13 +++++++++++++
 3 files changed, 100 insertions(+)
 create mode 100644 src/glx.c
 create mode 100644 src/mgl.c
 create mode 100644 src/window.c

(limited to 'src')

diff --git a/src/glx.c b/src/glx.c
new file mode 100644
index 0000000..4a5af9d
--- /dev/null
+++ b/src/glx.c
@@ -0,0 +1,39 @@
+#include "../include/mgl/glx.h"
+#include <dlfcn.h>
+#include <stdio.h>
+#include <GL/glx.h>
+
+static void* dlsym_print_fail(void *handle, const char *name) {
+    dlerror();
+    void *sym = dlsym(handle, name);
+    char *err_str = dlerror();
+
+    if(!sym)
+        fprintf(stderr, "dlsym(handle, \"%s\") failed, error: %s\n", name, err_str ? err_str : "(null)");
+
+    return sym;
+}
+
+int mgl_glx_load(mgl_glx *self) {
+    const char *glx_path = "/usr/lib/libGLX.so.0";
+    self->handle = dlopen(glx_path, RTLD_LAZY);
+    if(!self->handle) {
+        fprintf(stderr, "dlopen(\"%s\", RTLD_LAZY) failed\n", glx_path);
+        return -1;
+    }
+
+    self->glXGetFBConfigs = (GLXFBConfig* (*)(Display*, int, int*))dlsym_print_fail(self->handle, "glXGetFBConfigs");
+    if(!self->glXGetFBConfigs) {
+        mgl_glx_unload(self);
+        return -1;
+    }
+
+    return 0;
+}
+
+void mgl_glx_unload(mgl_glx *self) {
+    if(self->handle) {
+        dlclose(self->handle);
+        self->handle = NULL;
+    }
+}
diff --git a/src/mgl.c b/src/mgl.c
new file mode 100644
index 0000000..a7221d0
--- /dev/null
+++ b/src/mgl.c
@@ -0,0 +1,48 @@
+#include "../include/mgl/mgl.h"
+#include <X11/Xlib.h>
+#include <stdio.h>
+
+static mgl_context context;
+static int init_count = 0;
+static XErrorHandler prev_xerror = NULL;
+
+static int ignore_xerror(Display *display, XErrorEvent *ee) {
+    (void)display;
+    (void)ee;
+    return 0;
+}
+
+int mgl_init(void) {
+    ++init_count;
+    if(init_count == 1) {
+        context.connection = XOpenDisplay(NULL);
+        if(!context.connection) {
+            fprintf(stderr, "XOpenDisplay(NULL) failed\n");
+            mgl_deinit();
+            return -1;
+        }
+
+        prev_xerror = XSetErrorHandler(ignore_xerror);
+        if(mgl_glx_load(&context.glx) != 0) {
+            mgl_deinit();
+            return -1;
+        }
+    }
+    return 0;
+}
+
+void mgl_deinit(void) {
+    if(init_count == 1) {
+        mgl_glx_unload(&context.glx);
+        XSetErrorHandler(prev_xerror);
+        XCloseDisplay(context.connection);
+        context.connection = NULL;
+    }
+
+    if(init_count > 0)
+        --init_count;
+}
+
+mgl_context* mgl_get_context(void) {
+    return &context;
+}
diff --git a/src/window.c b/src/window.c
new file mode 100644
index 0000000..39855da
--- /dev/null
+++ b/src/window.c
@@ -0,0 +1,13 @@
+#include "../include/mgl/window.h"
+
+void mgl_window_init(mgl_window *self) {
+
+}
+
+void mgl_window_deinit(mgl_window *self) {
+
+}
+
+void mgl_window_show(mgl_window *self) {
+
+}
-- 
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