#include <config.h>
+#include <math.h>
#include <gtk/gtk.h>
#include <gtk/gtkgl.h>
#include <GL/gl.h>
+#include <GL/glu.h>
+
+#include "aweather-gui.h"
static gboolean expose_start(GtkWidget *da, GdkEventExpose *event, gpointer user_data)
{
+ g_message("opengl:expose_start");
GdkGLContext *glcontext = gtk_widget_get_gl_context(da);
GdkGLDrawable *gldrawable = gtk_widget_get_gl_drawable(da);
/* draw in here */
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+ return FALSE;
}
/* Plugins run stuff here */
static gboolean expose_end(GtkWidget *da, GdkEventExpose *event, gpointer user_data)
{
- GdkGLContext *glcontext = gtk_widget_get_gl_context(da);
- GdkGLDrawable *gldrawable = gtk_widget_get_gl_drawable(da);
+ g_message("opengl:expose_end\n");
+
+ GdkGLDrawable *gldrawable = gdk_gl_drawable_get_current();
if (gdk_gl_drawable_is_double_buffered(gldrawable))
gdk_gl_drawable_swap_buffers(gldrawable);
return FALSE;
}
-static gboolean configure(GtkWidget *da, GdkEventConfigure *event, gpointer user_data)
+static gboolean configure_start(GtkWidget *da, GdkEventConfigure *event, gpointer user_data)
{
- GdkGLContext *glcontext = gtk_widget_get_gl_context(da);
+ g_message("opengl:configure_start");
+ 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);
+
+ double width = da->allocation.width;
+ double height = da->allocation.height;
+ double dist = 500*1000; // 500 km
+
+ /* Misc */
+ glViewport(0, 0, width, height);
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+ glClearColor(0.8f, 0.8f, 1.0f, 0.0f);
+
+ /* Tessellation, "finding intersecting triangles" */
+ /* http://research.microsoft.com/pubs/70307/tr-2006-81.pdf */
+ /* http://www.opengl.org/wiki/Alpha_Blending */
+ glAlphaFunc(GL_GREATER,0.1);
+ glEnable(GL_ALPHA_TEST);
+
+ /* Depth test */
+ glClearDepth(1.0);
+ glDepthFunc(GL_LEQUAL);
+ glEnable(GL_DEPTH_TEST);
+
+ /* Perspective */
+ glMatrixMode(GL_PROJECTION);
+ glLoadIdentity();
+ double rad = atan(height/2*1000.0/dist); // 1px = 1000 meters
+ double deg = (rad*180)/M_PI;
+ gluPerspective(deg*2, width/height, dist-20, dist+20);
+
+ /* Camera position? */
+ glMatrixMode(GL_MODELVIEW);
+ glLoadIdentity();
+ glTranslatef(0.0, 0.0, -dist);
+ //glRotatef(-45, 1, 0, 0);
- glScalef(10., 10., 10.);
-
- gdk_gl_drawable_gl_end(gldrawable);
return FALSE;
}
+static gboolean configure_end(GtkWidget *da, GdkEventConfigure *event, gpointer user_data)
+{
+ g_message("opengl:configure_end");
+ GdkGLDrawable *gldrawable = gdk_gl_drawable_get_current();
+ gdk_gl_drawable_gl_end(gldrawable);
+ return FALSE;
+}
-gboolean opengl_init(GtkDrawingArea *drawing, GtkNotebook *config)
+gboolean opengl_init(AWeatherGui *gui)
{
+ GtkDrawingArea *drawing = aweather_gui_get_drawing(gui);
+
+ GdkGLConfig *glconfig = gdk_gl_config_new_by_mode(
+ GDK_GL_MODE_RGBA | GDK_GL_MODE_DEPTH |
+ GDK_GL_MODE_DOUBLE | GDK_GL_MODE_ALPHA);
+ if (!glconfig)
+ g_error("Failed to create glconfig");
+ if (!gtk_widget_set_gl_capability(GTK_WIDGET(drawing), glconfig, NULL, TRUE, GDK_GL_RGBA_TYPE))
+ g_error("GL lacks required capabilities");
+
/* Set up OpenGL Stuff */
- g_signal_connect(drawing, "configure-event", G_CALLBACK(configure), NULL);
-
- //g_signal_connect(drawing, "expose-event", G_CALLBACK(expose), NULL);
- g_signal_connect (drawing, "expose-event", G_CALLBACK(expose_start), NULL);
- g_signal_connect_after(drawing, "expose-event", G_CALLBACK(expose_end), NULL);
+ g_signal_connect (drawing, "configure-event", G_CALLBACK(configure_start), NULL);
+ g_signal_connect_after(drawing, "configure-event", G_CALLBACK(configure_end), NULL);
+ g_signal_connect (drawing, "expose-event", G_CALLBACK(expose_start), NULL);
+ g_signal_connect_after(drawing, "expose-event", G_CALLBACK(expose_end), NULL);
+ return TRUE;
}