Initial commit, skeleton

11 files changed, 201 insertions, 0 deletions

diff --git a/.gitignore b/.gitignore
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index 0000000..636c6b9
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,5 @@
+# Compiled sibs files
+sibs-build/
+compile_commands.json
+tests/sibs-build/
+tests/compile_commands.json
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..c2e5149
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,19 @@
+Copyright (c) 2021 dec05eba
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
\ No newline at end of file
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..b96efe3
--- /dev/null
+++ b/README.md
@@ -0,0 +1,7 @@
+# Minimal Graphics Library
+
+# Dependencies
+## Build
+`xlib`
+## Runtime
+`libglvnd (libGLX.so, libOpenGL.so)`
\ No newline at end of file
diff --git a/include/mgl/glx.h b/include/mgl/glx.h
new file mode 100644
index 0000000..dfb736d
--- /dev/null
+++ b/include/mgl/glx.h
@@ -0,0 +1,15 @@
+#ifndef MGL_GLX_H
+#define MGL_GLX_H
+
+typedef struct _XDisplay Display;
+typedef struct __GLXFBConfigRec *GLXFBConfig;
+
+typedef struct {
+    void *handle;
+    GLXFBConfig* (*glXGetFBConfigs)(Display *dpy, int screen, int *nelements);
+} mgl_glx;
+
+int mgl_glx_load(mgl_glx *self);
+void mgl_glx_unload(mgl_glx *self);
+
+#endif /* MGL_GLX_H */
diff --git a/include/mgl/mgl.h b/include/mgl/mgl.h
new file mode 100644
index 0000000..d896497
--- /dev/null
+++ b/include/mgl/mgl.h
@@ -0,0 +1,29 @@
+#ifndef MGL_MGL_H
+#define MGL_MGL_H
+
+#include "glx.h"
+
+/* Display* on x11 */
+typedef void* mgl_connection;
+
+typedef struct {
+    mgl_connection connection;
+    mgl_glx glx;
+} mgl_context;
+
+/*
+    Safe to call multiple times, but will only be initialized the first time called.
+    Returns non-0 value on failure.
+    Note: not thread safe.
+*/
+int mgl_init(void);
+
+/*
+    Safe to call multiple times, but will only be deinitialized the last time called.
+    Note: not thread safe.
+*/
+void mgl_deinit(void);
+
+mgl_context* mgl_get_context(void);
+
+#endif /* MGL_MGL_H */
diff --git a/include/mgl/window.h b/include/mgl/window.h
new file mode 100644
index 0000000..bd29936
--- /dev/null
+++ b/include/mgl/window.h
@@ -0,0 +1,12 @@
+#ifndef MGL_WINDOW_H
+#define MGL_WINDOW_H
+
+typedef struct {
+    int booba;
+} mgl_window;
+
+void mgl_window_init(mgl_window *self);
+void mgl_window_deinit(mgl_window *self);
+void mgl_window_show(mgl_window *self);
+
+#endif /* MGL_WINDOW_H */
diff --git a/project.conf b/project.conf
new file mode 100644
index 0000000..f9d0fdc
--- /dev/null
+++ b/project.conf
@@ -0,0 +1,8 @@
+[package]
+name = "mgl"
+type = "static"
+version = "0.1.0"
+platforms = ["posix"]
+
+[dependencies]
+x11 = ">=1"
\ No newline at end of file
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) {
+
+}
diff --git a/tests/main.c b/tests/main.c
new file mode 100644
index 0000000..ff1570b
--- /dev/null
+++ b/tests/main.c
@@ -0,0 +1,6 @@
+#include <stdio.h>
+
+int main(int argc, char **argv) {
+    printf("hello, world!\n");
+    return 0;
+}