From b2a5589ec7bc4350a62d374deab69e86465f0432 Mon Sep 17 00:00:00 2001 From: Andy Spencer Date: Sat, 7 Jun 2008 21:39:34 +0000 Subject: [PATCH] OpenGL Hello World --- src/Makefile.am | 2 +- src/aweather.c | 60 ++++++++++++++------ src/cube.c | 145 ++++++++++++++++++++++++++++++++++++++++++++++++ src/cube.h | 8 +++ 4 files changed, 197 insertions(+), 18 deletions(-) create mode 100644 src/cube.c create mode 100644 src/cube.h diff --git a/src/Makefile.am b/src/Makefile.am index 7605c8c..cca3efd 100644 --- a/src/Makefile.am +++ b/src/Makefile.am @@ -1,5 +1,5 @@ bin_PROGRAMS = aweather -aweather_SOURCES = aweather.c +aweather_SOURCES = aweather.c aweather.h cube.c cube.h aweather_CPPFLAGS = @PACKAGE_CFLAGS@ aweather_LDADD = @PACKAGE_LIBS@ diff --git a/src/aweather.c b/src/aweather.c index a2c33c3..c96cf19 100644 --- a/src/aweather.c +++ b/src/aweather.c @@ -1,41 +1,67 @@ #include #include +#include +#include -static void hello(GtkWidget *widget, gpointer data) +#include "cube.h" + +static void destroy(GtkWidget *widget, gpointer data) { - g_print("Hello World\n"); + gtk_main_quit(); } static gboolean delete_event(GtkWidget *widget, GdkEvent *event, gpointer data) { - g_print("delete event occurred\n"); + destroy(widget, data); return FALSE; } -static void destroy(GtkWidget *widget, gpointer data) +static gboolean key_press(GtkWidget *widget, GdkEventKey *event, gpointer data) { - gtk_main_quit(); + if (event->keyval == GDK_q) + destroy(widget, data); } int main(int argc, char *argv[]) { - GtkWidget *window; - GtkWidget *button; gtk_init(&argc, &argv); + gtk_gl_init(&argc, &argv); + + /* Set up window */ + GtkWidget *window = gtk_window_new(GTK_WINDOW_TOPLEVEL); + gtk_window_set_default_size(GTK_WINDOW(window), 800, 600); + g_signal_connect(G_OBJECT(window), "delete-event", G_CALLBACK(delete_event), NULL); + g_signal_connect(G_OBJECT(window), "delete-event", G_CALLBACK(delete_event), NULL); + g_signal_connect(G_OBJECT(window), "key-press-event", G_CALLBACK(key_press), NULL); + + /* Set up layout */ + GtkWidget *vbox = gtk_vbox_new(FALSE, 0); + gtk_container_add(GTK_CONTAINER(window), vbox); - window = gtk_window_new(GTK_WINDOW_TOPLEVEL); - g_signal_connect(G_OBJECT(window), "delete_event", G_CALLBACK(delete_event), NULL); - g_signal_connect(G_OBJECT(window), "destroy", G_CALLBACK(destroy), NULL); + /* Set up menu bar */ + GtkWidget *menu = gtk_menu_bar_new(); + GtkWidget *menu_file = gtk_menu_item_new_with_label("File"); + GtkWidget *menu_file_menu = gtk_menu_new(); + GtkWidget *menu_file_menu_quit = gtk_menu_item_new_with_label("Quit"); + gtk_box_pack_start(GTK_BOX(vbox), menu, FALSE, FALSE, 0); + gtk_menu_shell_append(GTK_MENU_SHELL(menu), menu_file); + gtk_menu_item_set_submenu(GTK_MENU_ITEM(menu_file), menu_file_menu); + gtk_menu_shell_append(GTK_MENU_SHELL(menu_file_menu), menu_file_menu_quit); + g_signal_connect(G_OBJECT(menu_file_menu_quit), "activate", G_CALLBACK(destroy), NULL); - gtk_container_set_border_width(GTK_CONTAINER(window), 10); - button = gtk_button_new_with_label("Hello World"); - g_signal_connect( G_OBJECT(button), "clicked", G_CALLBACK(hello), NULL); - g_signal_connect_swapped(G_OBJECT(button), "clicked", G_CALLBACK(gtk_widget_destroy), G_OBJECT(window)); + /* Set up darwing area */ + GtkWidget *drawing = gtk_drawing_area_new(); + gtk_box_pack_start(GTK_BOX(vbox), drawing, TRUE, TRUE, 0); + //gtk_widget_set_events(drawing, GDK_EXPOSURE_MASK); // needed? + GdkGLConfig *glconfig = gdk_gl_config_new_by_mode(GDK_GL_MODE_RGB | GDK_GL_MODE_DEPTH | GDK_GL_MODE_DOUBLE); + if (!glconfig) g_assert_not_reached(); + if (!gtk_widget_set_gl_capability(drawing, glconfig, NULL, TRUE, GDK_GL_RGBA_TYPE)) g_assert_not_reached(); + g_signal_connect(drawing, "configure-event", G_CALLBACK(configure), NULL); + g_signal_connect(drawing, "expose-event", G_CALLBACK(expose), NULL); + g_timeout_add(1000/60, rotate, drawing); - gtk_container_add(GTK_CONTAINER(window), button); - gtk_widget_show(button); - gtk_widget_show(window); + gtk_widget_show_all(window); gtk_main(); return 0; diff --git a/src/cube.c b/src/cube.c new file mode 100644 index 0000000..9465938 --- /dev/null +++ b/src/cube.c @@ -0,0 +1,145 @@ +#include +#include +#include +#include +#include +#include + +float boxv[][3] = { + { -0.5, -0.5, -0.5 }, + { 0.5, -0.5, -0.5 }, + { 0.5, 0.5, -0.5 }, + { -0.5, 0.5, -0.5 }, + { -0.5, -0.5, 0.5 }, + { 0.5, -0.5, 0.5 }, + { 0.5, 0.5, 0.5 }, + { -0.5, 0.5, 0.5 } +}; +#define ALPHA 0.5 + +static float ang = 30.; + +gboolean expose (GtkWidget *da, GdkEventExpose *event, gpointer user_data) +{ + GdkGLContext *glcontext = gtk_widget_get_gl_context (da); + GdkGLDrawable *gldrawable = gtk_widget_get_gl_drawable (da); + + // g_print (" :: expose\n"); + + if (!gdk_gl_drawable_gl_begin (gldrawable, glcontext)) + { + g_assert_not_reached (); + } + + /* draw in here */ + glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); + glPushMatrix(); + + glRotatef (ang, 1, 0, 1); + + glShadeModel(GL_FLAT); + + glBegin (GL_LINES); + glColor3f (1., 0., 0.); + glVertex3f (0., 0., 0.); + glVertex3f (1., 0., 0.); + glEnd (); + + glBegin (GL_LINES); + glColor3f (0., 1., 0.); + glVertex3f (0., 0., 0.); + glVertex3f (0., 1., 0.); + glEnd (); + + glBegin (GL_LINES); + glColor3f (0., 0., 1.); + glVertex3f (0., 0., 0.); + glVertex3f (0., 0., 1.); + glEnd (); + + glBegin(GL_LINES); + glColor3f (1., 1., 1.); + glVertex3fv(boxv[0]); + glVertex3fv(boxv[1]); + + glVertex3fv(boxv[1]); + glVertex3fv(boxv[2]); + + glVertex3fv(boxv[2]); + glVertex3fv(boxv[3]); + + glVertex3fv(boxv[3]); + glVertex3fv(boxv[0]); + + glVertex3fv(boxv[4]); + glVertex3fv(boxv[5]); + + glVertex3fv(boxv[5]); + glVertex3fv(boxv[6]); + + glVertex3fv(boxv[6]); + glVertex3fv(boxv[7]); + + glVertex3fv(boxv[7]); + glVertex3fv(boxv[4]); + + glVertex3fv(boxv[0]); + glVertex3fv(boxv[4]); + + glVertex3fv(boxv[1]); + glVertex3fv(boxv[5]); + + glVertex3fv(boxv[2]); + glVertex3fv(boxv[6]); + + glVertex3fv(boxv[3]); + glVertex3fv(boxv[7]); + glEnd(); + + glPopMatrix (); + + if (gdk_gl_drawable_is_double_buffered (gldrawable)) + gdk_gl_drawable_swap_buffers (gldrawable); + + else + glFlush (); + + gdk_gl_drawable_gl_end (gldrawable); + + return TRUE; +} + +gboolean configure(GtkWidget *da, GdkEventConfigure *event, gpointer user_data) +{ + GdkGLContext *glcontext = gtk_widget_get_gl_context (da); + GdkGLDrawable *gldrawable = gtk_widget_get_gl_drawable (da); + + if (!gdk_gl_drawable_gl_begin (gldrawable, glcontext)) + { + g_assert_not_reached (); + } + + glLoadIdentity(); + glViewport (0, 0, da->allocation.width, da->allocation.height); + glOrtho (-10,10,-10,10,-20050,10000); + glEnable (GL_BLEND); + glBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); + + glScalef (10., 10., 10.); + + gdk_gl_drawable_gl_end (gldrawable); + + return TRUE; +} + +gboolean rotate (gpointer user_data) +{ + GtkWidget *da = GTK_WIDGET (user_data); + + ang++; + + gdk_window_invalidate_rect (da->window, &da->allocation, FALSE); + gdk_window_process_updates (da->window, FALSE); + + return TRUE; +} diff --git a/src/cube.h b/src/cube.h new file mode 100644 index 0000000..4ba6a69 --- /dev/null +++ b/src/cube.h @@ -0,0 +1,8 @@ +#ifndef CUBE_H +#define CUBE_H + +gboolean expose(GtkWidget *da, GdkEventExpose *event, gpointer user_data); +gboolean configure(GtkWidget *da, GdkEventConfigure *event, gpointer user_data); +gboolean rotate(gpointer user_data); + +#endif -- 2.41.0