renaming to plugins

[grits] / src / opengl.c

diff --git a/src/opengl.c b/src/opengl.c
index 8ab075a00645cefb07d935ee0fa3fb48e14380c7..e9d4a7e3a0a6d44ea35d6f361e4b8ec1f4db4f8d 100644 (file)
--- a/src/opengl.c
+++ b/src/opengl.c
@@ -1,10 +1,13 @@
 #include <config.h>
+#include <math.h>
 #include <gtk/gtk.h>
 #include <gtk/gtkgl.h>
 #include <GL/gl.h>
+#include <GL/glu.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);
 
@@ -14,12 +17,14 @@ static gboolean expose_start(GtkWidget *da, GdkEventExpose *event, gpointer user
 
        /* draw in here */
        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
-       return TRUE;
+       return FALSE;
 }
 /* Plugins run stuff here */
 static gboolean expose_end(GtkWidget *da, GdkEventExpose *event, gpointer user_data)
 {
-       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);
@@ -30,34 +35,65 @@ static gboolean expose_end(GtkWidget *da, GdkEventExpose *event, gpointer user_d
 
        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);
+       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);
 
-       glScalef(10., 10., 10.);
-       
-       gdk_gl_drawable_gl_end(gldrawable);
+       /* 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);
+
+
+       return FALSE;
+}
+static gboolean configure_end(GtkWidget *da, GdkEventConfigure *event, gpointer user_data)
+{
+       GdkGLDrawable *gldrawable = gdk_gl_drawable_get_current();
+       gdk_gl_drawable_gl_end(gldrawable);
        return FALSE;
 }
 
 gboolean opengl_init(GtkDrawingArea *drawing, GtkNotebook *config)
 {
        /* 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;
 }