Moving examples out of src to make gtk-doc happy

[grits] / examples / tex / tex.c

diff --git a/examples/tex/tex.c b/examples/tex/tex.c
new file mode 100644 (file)
index 0000000..76bfb2c
--- /dev/null
+++ b/examples/tex/tex.c
@@ -0,0 +1,143 @@
+#include <gtk/gtk.h>
+#include <gtk/gtkgl.h>
+#include <gdk/gdkkeysyms.h>
+#include <GL/gl.h>
+#include <GL/glu.h>
+
+guint tex, texl, texr;
+
+gboolean on_key_press(GtkWidget *widget, GdkEventKey *event, gpointer _)
+{
+       if (event->keyval == GDK_q)
+               gtk_main_quit();
+       return FALSE;
+}
+
+gboolean on_expose(GtkWidget *drawing, GdkEventExpose *event, gpointer _)
+{
+       glClearColor(0.5, 0.5, 1.0, 1.0);
+       glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+       glMatrixMode(GL_PROJECTION);
+       glLoadIdentity();
+       glOrtho(-1,1, -1,1, 10,-10);
+       glMatrixMode(GL_MODELVIEW);
+       glLoadIdentity();
+       glTranslatef(0, 0, -5);
+
+       glEnable(GL_COLOR_MATERIAL);
+       glDisable(GL_TEXTURE_2D);
+       glColor3f(1.0, 1.0, 1.0);
+       glBegin(GL_QUADS);
+       glVertex3f(-0.25, -0.75, 0.0);
+       glVertex3f(-0.25,  0.75, 0.0);
+       glVertex3f( 0.25,  0.75, 0.0);
+       glVertex3f( 0.25, -0.75, 0.0);
+       glEnd();
+
+       /* Textures */
+       glDisable(GL_COLOR_MATERIAL);
+       glEnable(GL_TEXTURE_2D);
+       glEnable(GL_BLEND);
+
+       gdouble y = 0.875;
+
+       /* Left */
+       glBlendFunc(GL_ONE, GL_ZERO);
+       glBindTexture(GL_TEXTURE_2D, texl);
+       glBegin(GL_QUADS);
+       glTexCoord2f(0.0, y); glVertex3f(-0.75,  0.0, 0.0);
+       glTexCoord2f(0.0, 1.0); glVertex3f(-0.75,  0.5, 0.0);
+       glTexCoord2f(2.0, 1.0); glVertex3f( 0.75,  0.5, 0.0);
+       glTexCoord2f(2.0, y); glVertex3f( 0.75,  0.0, 0.0);
+       glEnd();
+
+       /* Right */
+       glBlendFunc(GL_ONE, GL_ONE);
+       glBindTexture(GL_TEXTURE_2D, texr);
+       glBegin(GL_QUADS);
+       glTexCoord2f(-1.0, y); glVertex3f(-0.75, 0.0, 0.0);
+       glTexCoord2f(-1.0, 1.0); glVertex3f(-0.75, 0.5, 0.0);
+       glTexCoord2f( 1.0, 1.0); glVertex3f( 0.75, 0.5, 0.0);
+       glTexCoord2f( 1.0, y); glVertex3f( 0.75, 0.0, 0.0);
+       glEnd();
+
+       /* Bottom */
+       glBlendFunc(GL_ONE, GL_ZERO);
+       glBindTexture(GL_TEXTURE_2D, tex);
+       glBegin(GL_QUADS);
+       glTexCoord2f(0.0, 0.0); glVertex3f(-0.75, -0.5, 0.0);
+       glTexCoord2f(0.0, 1.0-y); glVertex3f(-0.75, -0.0, 0.0);
+       glTexCoord2f(1.0, 1.0-y); glVertex3f( 0.75, -0.0, 0.0);
+       glTexCoord2f(1.0, 0.0); glVertex3f( 0.75, -0.5, 0.0);
+       glEnd();
+
+
+       /* Flush */
+       GdkGLDrawable *gldrawable = gdk_gl_drawable_get_current();
+       if (gdk_gl_drawable_is_double_buffered(gldrawable))
+               gdk_gl_drawable_swap_buffers(gldrawable);
+       else
+               glFlush();
+       return FALSE;
+}
+gboolean on_configure(GtkWidget *drawing, GdkEventConfigure *event, gpointer _)
+{
+       glViewport(0, 0,
+               drawing->allocation.width,
+               drawing->allocation.height);
+       return FALSE;
+}
+
+guint load_tex(gchar *filename)
+{
+       GdkPixbuf *pixbuf = gdk_pixbuf_new_from_file(filename, NULL);
+       guchar    *pixels = gdk_pixbuf_get_pixels(pixbuf);
+       int        width  = gdk_pixbuf_get_width(pixbuf);
+       int        height = gdk_pixbuf_get_height(pixbuf);
+       int        alpha  = gdk_pixbuf_get_has_alpha(pixbuf);
+       guint      tex;
+       glGenTextures(1, &tex);
+       glBindTexture(GL_TEXTURE_2D, tex);
+       glTexImage2D(GL_TEXTURE_2D, 0, 4, width, height, 0,
+                       (alpha ? GL_RGBA : GL_RGB), GL_UNSIGNED_BYTE, pixels);
+       glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+       glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+
+       glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_BORDER);
+       glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_BORDER);
+       g_object_unref(pixbuf);
+       return tex;
+}
+
+int main(int argc, char **argv)
+{
+       gtk_init(&argc, &argv);
+
+       GtkWidget   *window   = gtk_window_new(GTK_WINDOW_TOPLEVEL);
+       GtkWidget   *drawing  = gtk_drawing_area_new();
+       GdkGLConfig *glconfig = gdk_gl_config_new_by_mode((GdkGLConfigMode)(
+                       GDK_GL_MODE_RGBA   | GDK_GL_MODE_DEPTH |
+                       GDK_GL_MODE_DOUBLE | GDK_GL_MODE_ALPHA));
+       g_signal_connect(window,  "destroy",         G_CALLBACK(gtk_main_quit), NULL);
+       g_signal_connect(window,  "key-press-event", G_CALLBACK(on_key_press),  NULL);
+       g_signal_connect(drawing, "expose-event",    G_CALLBACK(on_expose),     NULL);
+       g_signal_connect(drawing, "configure-event", G_CALLBACK(on_configure),  NULL);
+       gtk_widget_set_gl_capability(drawing, glconfig, NULL, TRUE, GDK_GL_RGBA_TYPE);
+       gtk_container_add(GTK_CONTAINER(window), drawing);
+       gtk_widget_show_all(window);
+
+       /* OpenGL setup */
+       GdkGLContext  *glcontext  = gtk_widget_get_gl_context(GTK_WIDGET(drawing));
+       GdkGLDrawable *gldrawable = gtk_widget_get_gl_drawable(GTK_WIDGET(drawing));
+       gdk_gl_drawable_gl_begin(gldrawable, glcontext);
+
+       /* Load texture */
+       texl = load_tex("texls.png");
+       texr = load_tex("texrs.png");
+       tex  = load_tex("tex.png");
+
+       gtk_main();
+
+       gdk_gl_drawable_gl_end(gldrawable);
+}