From 3b2fceed064c06d55e1cd33d51e855e909c81f75 Mon Sep 17 00:00:00 2001
From: dec05eba <dec05eba@protonmail.com>
Date: Sun, 10 Oct 2021 12:56:55 +0200
Subject: add event and test graphics

---
 src/mgl.c | 86 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 83 insertions(+), 3 deletions(-)

(limited to 'src/mgl.c')

diff --git a/src/mgl.c b/src/mgl.c
index a7221d0..27d33ae 100644
--- a/src/mgl.c
+++ b/src/mgl.c
@@ -1,7 +1,26 @@
 #include "../include/mgl/mgl.h"
-#include <X11/Xlib.h>
+#include <X11/Xutil.h>
+#include <stdlib.h>
 #include <stdio.h>
 
+#define GLX_USE_GL 1
+#define GLX_BUFFER_SIZE 2
+#define GLX_LEVEL 3
+#define GLX_RGBA 4
+#define GLX_DOUBLEBUFFER 5
+#define GLX_STEREO 6
+#define GLX_AUX_BUFFERS 7
+#define GLX_RED_SIZE 8
+#define GLX_GREEN_SIZE 9
+#define GLX_BLUE_SIZE 10
+#define GLX_ALPHA_SIZE 11
+#define GLX_DEPTH_SIZE 12
+#define GLX_STENCIL_SIZE 13
+#define GLX_ACCUM_RED_SIZE 14
+#define GLX_ACCUM_GREEN_SIZE 15
+#define GLX_ACCUM_BLUE_SIZE	16
+#define GLX_ACCUM_ALPHA_SIZE 17
+
 static mgl_context context;
 static int init_count = 0;
 static XErrorHandler prev_xerror = NULL;
@@ -12,6 +31,46 @@ static int ignore_xerror(Display *display, XErrorEvent *ee) {
     return 0;
 }
 
+static int glx_context_init() {
+    const int attr[] = {
+        GLX_RGBA,
+        GLX_DEPTH_SIZE, 0,
+        GLX_STENCIL_SIZE, 0,
+        GLX_RED_SIZE, 8,
+        GLX_GREEN_SIZE, 8,
+        GLX_BLUE_SIZE, 8,
+        GLX_ALPHA_SIZE, 0,
+        GLX_DOUBLEBUFFER, /* TODO: Add option to turn this off? */
+        None
+    };
+
+    context.visual_info = context.glx.glXChooseVisual(context.connection, DefaultScreen(context.connection), (int*)attr);
+    if(!context.visual_info) {
+        fprintf(stderr, "glXChooseVisual failed, no appropriate visual found\n");
+        return -1;
+    }
+
+    context.glx_context = context.glx.glXCreateContext(context.connection, context.visual_info, NULL, 1);
+    if(!context.glx_context) {
+        fprintf(stderr, "glXCreateContext failed\n");
+        return -1;
+    }
+
+    return 0;
+}
+
+static void glx_context_deinit() {
+    if(context.glx_context) {
+        context.glx.glXDestroyContext(context.connection, context.glx_context);
+        context.glx_context = NULL;
+    }
+
+    if(context.visual_info) {
+        XFree(context.visual_info);
+        context.visual_info = NULL;
+    }
+}
+
 int mgl_init(void) {
     ++init_count;
     if(init_count == 1) {
@@ -23,20 +82,35 @@ int mgl_init(void) {
         }
 
         prev_xerror = XSetErrorHandler(ignore_xerror);
+
         if(mgl_glx_load(&context.glx) != 0) {
             mgl_deinit();
             return -1;
         }
+
+        if(mgl_gl_load(&context.gl) != 0) {
+            mgl_deinit();
+            return -1;
+        }
+
+        if(glx_context_init() != 0) {
+            mgl_deinit();
+            return -1;
+        }
     }
     return 0;
 }
 
 void mgl_deinit(void) {
     if(init_count == 1) {
+        glx_context_deinit();
+        mgl_gl_unload(&context.gl);
         mgl_glx_unload(&context.glx);
         XSetErrorHandler(prev_xerror);
-        XCloseDisplay(context.connection);
-        context.connection = NULL;
+        if(context.connection) {
+            XCloseDisplay(context.connection);
+            context.connection = NULL;
+        }
     }
 
     if(init_count > 0)
@@ -44,5 +118,11 @@ void mgl_deinit(void) {
 }
 
 mgl_context* mgl_get_context(void) {
+#ifndef NDEBUG
+    if(init_count == 0) {
+        fprintf(stderr, "Error: mgl_get_context was called before mgl_init\n");
+        abort();
+    }
+#endif
     return &context;
 }
-- 
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