project for a (works on my devices) demo

SOURCES/graphics/library/application_context.c

@@ -0,0 +1,83 @@
+#include "application_context.h"
+
+#include "window/window.h"
+
+#include "../os/WAYLAND/wl_context.h"
+#include "../os/EGL/egl_context.h"
+#include "../os/EGL/GLES_3_1_compatibility.h"
+#include <wayland-egl.h>
+
+
+#include <stdlib.h>
+#include <stdio.h>
+
+application_context* application_context_malloc(){
+	application_context *app = malloc( sizeof( application_context));
+	return app;
+}
+
+application_context* application_context_new( const char *title){
+	wl_context *wl;
+	egl_context *egl;
+	gui_component *win;
+	application_context *app;
+
+	app = application_context_malloc();
+	/* get the builders and the display connection */
+	wl = wl_context_new();
+	app->w_context = wl;
+
+    fprintf(stderr, "created WL_CONTEXT\n");
+
+
+	/* builds the minimal for a running */
+	win = window_new( 
+		title, 
+		ui_dimensions_new(
+			wl_context_get(GLUT_SCREEN_WIDTH), 
+			wl_context_get(GLUT_SCREEN_HEIGHT)
+		), 
+		app
+	);
+
+    fprintf(stderr, "CREATED WINDOW\n");
+
+	/* ??? allocates the required struct for binding a buffer to the wl_surface of the window's toplevel */
+	app->win = win;
+	app->running = 1;
+
+	window_gui_enrichment *win_x = ( window_gui_enrichment* ) win->specialization;
+	win_x->egl_window = wl_egl_window_create( win->graphics->surface, win->graphics->dimensions->w, win->graphics->dimensions->h);
+
+	/* EGL_NO_SURFACE */
+	if (NULL == win_x->egl_window) {
+	    fprintf(stderr, "Couldn't create EGL window\n");
+	    exit(1);
+  	}
+
+	/* gets the context for GLES2 graphics API */
+	egl = egl_context_new( wl->display);
+	app->e_context = egl;
+
+	win_x->egl_surface = eglCreateWindowSurface(
+		egl->display,
+		egl->config,
+		(EGLNativeWindowType) win_x->egl_window, 
+		NULL
+	);
+	if( EGL_NO_SURFACE == win_x->egl_surface) {
+		fprintf(stderr, "Couldn't create EGL surface\n");
+		printEGLError();
+
+		exit(EXIT_FAILURE);
+	}
+
+	if( ! eglMakeCurrent(egl->display, win_x->egl_surface, win_x->egl_surface, egl->context)) {
+		fprintf(stderr, "Couldn't make EGL context current\n");
+		exit(EXIT_FAILURE);
+	}
+
+	GLES_3_1_compatibility_init();
+
+	return app;
+}

SOURCES/graphics/library/application_context.h

@@ -0,0 +1,18 @@
+#pragma once
+
+#include "../os/WAYLAND/wl_context.h"
+#include "../os/EGL/egl_context.h"
+
+#include "gui_component/gui_component.h"
+
+typedef struct {
+	wl_context *w_context;
+	egl_context *e_context;
+	gui_component *win;
+
+	uint8_t running;
+} application_context;
+
+application_context* application_context_malloc();
+
+application_context* application_context_new( const char *title);

SOURCES/graphics/library/gui_component/gui_component.c

@@ -0,0 +1,87 @@
+#include "gui_component.h"
+#include "listeners/xdg_surface_listener.h"
+
+#include <stdlib.h>
+
+/* 
+	listener to be bound on XDG surfaces
+
+	the only event declared by the xdg_surface is the "configure" one
+	indicates the hint for the client to update the arrangement of surfaces ( i.e. change of resolution )
+*/
+const struct xdg_surface_listener surface_listener = {
+	surface_configure
+};
+
+gui_component_graphics* gui_component_graphics_new(
+	ui_position *pos,
+	ui_dimensions *dim,
+	surface_builders *builders
+){
+	gui_component_graphics *g = malloc( sizeof( gui_component_graphics));
+	g->dimensions = dim;
+	g->position = pos;
+
+	g->surface = wl_compositor_create_surface( builders->compositor);
+	g->xdg_surface = xdg_wm_base_get_xdg_surface( builders->xdg_wm_base, g->surface);
+	xdg_surface_add_listener( g->xdg_surface, &surface_listener, NULL);
+
+	return g;
+}
+
+gui_component* gui_component_new_begin(
+	gui_component *parent,
+	ui_position *pos,
+	ui_dimensions *dim,
+	void (*draw_callback) ( gui_component*, int),
+	void (*resize_callback) ( gui_component*, resize_event*),
+	void (*input_callback) ( gui_component*, resize_event*),
+	surface_builders *builders
+){
+	gui_component* c = malloc( sizeof( gui_component));
+
+	c->specialization = NULL;
+	c->graphics = gui_component_graphics_new( pos, dim, builders);
+	c->draw_callback = draw_callback;
+	
+	if( parent){
+		gui_component_add_child( parent, c);
+	}
+	
+	c->children = gui_components_list_new();
+	return c;
+}
+
+void gui_component_new_end( gui_component* toComplete){
+	/*
+		must be called at the end of the configuration
+	*/
+	wl_surface_commit( toComplete->graphics->surface);
+
+}
+
+
+void gui_component_add_child( gui_component *parent, gui_component *child){
+	/* missing args */
+	if( ! parent || ! child){
+	
+	}
+	
+	/* components cannot be moved around at the moment, plug once and bye */
+	if( child->parent){
+	}
+	
+	child->parent = parent;
+	gui_components_list_add( parent->children, child);
+}
+
+void child_draw( gui_component* child, void *extra){
+	int *casted = (int*) extra;
+	int deltaTime = *casted;
+	gui_component_draw( child, deltaTime);
+}
+
+void gui_component_draw( gui_component *c, int deltaTime){
+	c->draw_callback( c, deltaTime);
+	gui_components_list_foreach( c->children, child_draw, (void*) &deltaTime);
+}

SOURCES/graphics/library/gui_component/gui_component.h

@@ -0,0 +1,72 @@
+#pragma once
+
+#include "../../os/WAYLAND/wl_context.h"
+#include "../../2d_structs.h"
+
+#include "gui_components_list.h"
+
+
+typedef struct {
+	int type;
+} input_event;
+
+typedef struct {
+	int w;
+	int h;
+} resize_event;
+
+typedef struct {
+	ui_dimensions *dimensions;
+	ui_position *position;
+
+	struct wl_surface *surface;
+	struct xdg_surface *xdg_surface;
+} 
+gui_component_graphics;
+
+typedef struct gui_component_raw {
+	void ( *draw_callback) ( struct gui_component_raw*, int);
+	void ( *resize_callback) ( struct gui_component_raw*, resize_event*);
+	void ( *input_callback) ( struct gui_component_raw*, resize_event*);
+
+	struct gui_component_raw *parent;
+	struct gui_components_list_raw *children;
+
+	gui_component_graphics *graphics;
+	
+	void *specialization;
+}
+gui_component;
+
+gui_component_graphics* gui_component_graphics_new(
+	ui_position *pos,
+	ui_dimensions *dim,
+	surface_builders *builders
+);
+
+/* called for initializing common configs */
+gui_component* gui_component_new_begin(
+	gui_component *parent,
+	ui_position *pos,
+	ui_dimensions *dim,
+	void (*draw_callback) ( gui_component*, int),
+	void (*resize_callback) ( gui_component*, resize_event*),
+	void (*input_callback) ( gui_component*, resize_event*),
+	surface_builders *builders
+);
+
+/* must be called after specialized init for completing the configuration */
+void gui_component_new_end( gui_component* toComplete);
+
+void gui_component_add_child( gui_component *parent, gui_component *child);
+
+void gui_component_draw( gui_component *c, int deltaTime);
+
+void gui_component_input_event( gui_component *c, input_event *e);
+
+void gui_component_resize_event( gui_component *c, resize_event *e);
+/*
+	draw callback
+	input callback
+	resize callback
+*/

SOURCES/graphics/library/gui_component/gui_components_list.c

@@ -0,0 +1,28 @@
+#include "gui_components_list.h"
+
+#include <stdlib.h>
+
+gui_components_list* gui_components_list_new(){
+	gui_components_list *l = malloc( sizeof( gui_components_list));
+	l->count = 0;
+	TAILQ_INIT(&( l->queue));
+	return l;
+
+}
+
+void gui_components_list_add( gui_components_list* list, gui_component *toAdd){
+	gui_components_list_entry *entry = malloc( sizeof( gui_components_list_entry));
+	entry->data = toAdd;
+
+	TAILQ_INSERT_TAIL( &(list->queue), entry, gui_components_list_entries);
+ 	list->count++;
+}
+
+void gui_components_list_foreach( gui_components_list* list, void ( *toRun) ( gui_component*, void*), void* extra){
+	gui_components_list_head *headp = &( list->queue);
+	gui_components_list_entry *current;
+
+	TAILQ_FOREACH( current, headp, gui_components_list_entries){
+		toRun( current->data, extra);
+	}
+}

SOURCES/graphics/library/gui_component/gui_components_list.h

@@ -0,0 +1,41 @@
+#pragma once
+
+#include "gui_component.h"
+
+#include <sys/queue.h>
+
+/*
+typedef struct AAA_RAW {
+	void *data;
+	TAILQ_ENTRY(AAA_RAW) AAAs; // Singly linked List
+} AAA;
+
+
+
+typedef TAILQ_HEAD(BBB_RAW, AAA_RAW) BBB;
+
+typedef struct {
+	BBB queue;
+	int count;
+} CCC;
+*/
+
+
+typedef struct gui_components_list_entry_raw {
+	struct gui_component_raw *data;
+	TAILQ_ENTRY(gui_components_list_entry_raw) gui_components_list_entries; /* Singly linked List. */
+} gui_components_list_entry;
+
+typedef TAILQ_HEAD(gui_components_list_head_raw, gui_components_list_entry_raw) gui_components_list_head;
+
+typedef struct gui_components_list_raw {
+	gui_components_list_head queue;
+	int count;
+}
+gui_components_list;
+
+gui_components_list* gui_components_list_new();
+
+void gui_components_list_add( gui_components_list *list, struct gui_component_raw *toAdd);
+
+void gui_components_list_foreach( gui_components_list *list, void (*toRun) ( struct gui_component_raw*, void*), void *extra);

SOURCES/graphics/library/gui_component/listeners/xdg_surface_listener.c

@@ -0,0 +1,16 @@
+#include "xdg_surface_listener.h"
+
+/******************************/
+/********XDG surface **********/
+/******************************/
+
+/* listener bound to the various xdg_surfaces for listening to "configure" events
+	the client should rearrange its surfaces to accomodate the new state
+	the client should answer to (ACK) the event
+*/
+void surface_configure(void *data, struct xdg_surface *xdg_surface,
+				uint32_t serial) {
+	(void) data;
+
+	xdg_surface_ack_configure(xdg_surface, serial);
+}

SOURCES/graphics/library/gui_component/listeners/xdg_surface_listener.h

@@ -0,0 +1,9 @@
+#pragma once
+
+#include "../../../os/WAYLAND/xdg-shell.h"
+
+void surface_configure(
+	void *data, 
+	struct xdg_surface *xdg_surface,
+	uint32_t serial
+);

SOURCES/graphics/library/panel/panel.c

@@ -0,0 +1,7 @@
+gui_component* panel_new(
+	gui_component *parent,
+	ui_position *pos,
+	ui_dimensions *dim
+){
+
+}

SOURCES/graphics/library/panel/panel.h

@@ -0,0 +1,7 @@
+#pragma once
+
+gui_component* panel_new(
+	gui_component *parent,
+	ui_position *pos,
+	ui_dimensions *dim
+);

SOURCES/graphics/library/window/listeners/xdg_toplevel_listener.c

@@ -0,0 +1,62 @@
+#include "xdg_toplevel_listener.h"
+#include "../window.h"
+#include "../../application_context.h"
+
+#include <wayland-egl.h>
+
+#include <stdlib.h>
+#include <stdio.h>
+
+/******************************/
+/********XDG Toplevel**********/
+/******************************/
+
+/* listener bound to the toplevel surface
+	the toplevel may raise a "configure" event, which hints the client about reconfiguring its state
+
+	here we propagate the new width and height to the EGL window ( probably for readjusting buffers )
+*/
+void toplevel_configure(
+	void *data, 
+	struct xdg_toplevel *xdg_toplevel,
+	int32_t width, 
+	int32_t height, 
+	struct wl_array *states
+) {
+	(void) states;
+	gui_component *comp = data;
+	
+	if( ! comp){
+		fprintf(stderr, "inconsistency during toplevel configure : no payload\n");
+		exit(EXIT_FAILURE);
+	}
+	
+	window_gui_enrichment *win = (window_gui_enrichment*) comp->specialization;
+
+	if( ! win || win->xdg_toplevel != xdg_toplevel){
+		fprintf(stderr, "inconsistency during toplevel configure\n");
+		fprintf(stderr, "window->xdg_toplevel %p\nxdg_toplevel %p\n", 
+			(void*) win->xdg_toplevel, 
+			(void*) xdg_toplevel
+		);
+		exit(EXIT_FAILURE);
+	}
+
+	if(!width && !height) return;
+
+	if( comp->graphics->dimensions->w != width || comp->graphics->dimensions->h != height) {
+		comp->graphics->dimensions->w = width;
+		comp->graphics->dimensions->h = height;
+
+		wl_egl_window_resize(win->egl_window, width, height, 0, 0);
+		wl_surface_commit(comp->graphics->surface);
+	}
+}
+
+void toplevel_close( void *data, struct xdg_toplevel *xdg_toplevel) {
+	(void) xdg_toplevel;
+
+	application_context *app = data;
+
+	app->running = 0;
+}

SOURCES/graphics/library/window/listeners/xdg_toplevel_listener.h

@@ -0,0 +1,22 @@
+#pragma once
+
+#include "../../../os/WAYLAND/xdg-shell.h"
+
+/******************************/
+/********XDG Toplevel**********/
+/******************************/
+
+/* listener bound to the toplevel surface
+	the toplevel may raise a "configure" event, which hints the client about reconfiguring its state
+
+	here we propagate the new width and height to the EGL window ( probably for readjusting buffers )
+*/
+void toplevel_configure(
+	void *data, 
+	struct xdg_toplevel *xdg_toplevel,
+	int32_t width, 
+	int32_t height, 
+	struct wl_array *states
+);
+
+void toplevel_close( void *data, struct xdg_toplevel *xdg_toplevel);

SOURCES/graphics/library/window/window.c

@@ -0,0 +1,80 @@
+#include "window.h"
+#include "listeners/xdg_toplevel_listener.h"
+
+#include "../../os/WAYLAND/xdg-shell.h"
+
+#include <wayland-egl.h>
+
+#include <GLES2/gl2.h>
+#include <stdlib.h>
+#include <stdio.h>
+
+
+const struct xdg_toplevel_listener toplevel_listener = {
+	toplevel_configure,
+	toplevel_close
+};
+
+/******************************/
+/************APIs**************/
+/******************************/
+
+window_gui_enrichment *window_gui_enrichment_new(
+	struct xdg_surface *xdg_surface,
+	const char *title,
+	application_context *ctx
+){
+	window_gui_enrichment *win;
+
+	win->egl_window = NULL;
+	win->egl_surface = NULL;
+	win->ctx = ctx;
+
+	win->xdg_toplevel = xdg_surface_get_toplevel( xdg_surface);
+	xdg_toplevel_set_title( win->xdg_toplevel, title);
+	xdg_toplevel_add_listener( win->xdg_toplevel, &toplevel_listener, win);
+
+	return win;
+}
+
+void swapBuffers( application_context *app){
+
+	window_gui_enrichment *win = (window_gui_enrichment*) app->win->specialization;
+	wl_display_dispatch_pending(app->w_context->display);
+	eglSwapBuffers( app->e_context->display, win->egl_surface);
+}
+
+
+void draw_callback( gui_component* toDraw, int deltaTime){
+	glClearColor(1, 0, 0, 0);
+	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+	/* should iterate on all the children */
+
+	window_gui_enrichment *win = toDraw->specialization;
+	swapBuffers( win->ctx);
+}
+
+gui_component* window_new(
+	const char *title, 
+	ui_dimensions *dim, 
+	application_context *app
+){
+	void (*resize_callback) ( gui_component*, resize_event*) = 0;
+	void (*input_callback) ( gui_component*, resize_event*) = 0;
+	
+	fprintf(stderr, "WINDOW NEW\n");
+
+	gui_component *c = gui_component_new_begin( NULL, ui_position_new(0, 0), dim, draw_callback, resize_callback, input_callback, app->w_context->builders );
+
+    fprintf(stderr, "WINDOW DID GUI_COMP_NEW\n");
+
+	window_gui_enrichment *spec = window_gui_enrichment_new( c->graphics->xdg_surface, title, app);
+	c->specialization = (void*) spec;
+
+    fprintf(stderr, "WINDOW DID ENRICHMENT NEW\n");
+
+
+	gui_component_new_end( c);
+	return c;
+}

SOURCES/graphics/library/window/window.h

@@ -0,0 +1,32 @@
+#pragma once
+#include "../gui_component/gui_component.h"
+
+#include "../application_context.h"
+
+#include <EGL/egl.h>
+#include "../../os/WAYLAND/wl_context.h"
+#include "../../2d_structs.h"
+#include "../../os/WAYLAND/xdg-shell.h"
+
+
+typedef struct {
+	struct xdg_toplevel *xdg_toplevel;
+	struct wl_egl_window *egl_window;
+	EGLSurface *egl_surface;
+	
+	application_context *ctx;
+} 
+window_gui_enrichment;
+
+window_gui_enrichment *window_gui_enrichment_new(
+	struct xdg_surface *xdg_surface,
+	const char *title,
+	application_context *ctx
+);
+
+/* the toplevel listener registration callback offers a void* arg for passing data inside the callback (our app state in this case, waiting for narrowing) */
+gui_component* window_new( 
+	const char *title, 
+	ui_dimensions *dim, 
+	application_context *ctx
+);