1 /*******************************************************************************
2 **3456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789
3 ** 10 20 30 40 50 60 70 80
9 ** Mirco "MacSlow" Mueller <macslow@bangang.de>
11 ** copyright (C) Mirco Mueller, July 2006
14 ** Simple example demonstrating how one could use cairo for generating
15 ** dynamic texture-mapping with OpenGL. Intended to be run on a composited
16 ** desktop (e.g. compiz, xcompmgr) with proper a OpenGL-implementation. I put
17 ** this program under the terms of the "GNU General Public License". If you
18 ** don't know what that means take a look a here...
20 ** http://www.gnu.org/licenses/licenses.html#GPL
22 *******************************************************************************/
25 #include <gtk/gtkgl.h>
30 #include "cairo-rendering.h"
32 GTimer
* g_pTimerId
= NULL
;
35 cairo_t
* g_pCairoContext
[3];
36 guchar
* g_pucSurfaceData
[3];
37 gulong g_ulMilliSeconds
= 0L;
41 int main (int argc
, char** argv
)
43 GtkWidget
* pWindow
= NULL
;
44 GdkGLConfig
* pGlConfig
= NULL
;
45 GtkWidget
* pDrawingArea
= NULL
;
46 guint uiDrawHandlerId
= 0;
47 cairo_surface_t
* pCairoSurface
[2];
49 g_lineOne
.start
.fX
= 0.1f
;
50 g_lineOne
.start
.fY
= 0.2f
;
51 g_lineOne
.start
.bGrowX
= TRUE
;
52 g_lineOne
.start
.bGrowY
= TRUE
;
53 g_lineOne
.start
.fStepX
= 0.025f
;
54 g_lineOne
.start
.fStepY
= 0.02f
;
55 g_lineOne
.start
.fLowerLimitX
= 0.1f
;
56 g_lineOne
.start
.fUpperLimitX
= 0.9f
;
57 g_lineOne
.start
.fLowerLimitY
= 0.1f
;
58 g_lineOne
.start
.fUpperLimitY
= 0.9f
;
60 g_lineOne
.end
.fX
= 0.5f
;
61 g_lineOne
.end
.fY
= 0.7f
;
62 g_lineOne
.end
.bGrowX
= TRUE
;
63 g_lineOne
.end
.bGrowY
= FALSE
;
64 g_lineOne
.end
.fStepX
= 0.025f
;
65 g_lineOne
.end
.fStepY
= 0.01f
;
66 g_lineOne
.end
.fLowerLimitX
= 0.1f
;
67 g_lineOne
.end
.fUpperLimitX
= 0.9f
;
68 g_lineOne
.end
.fLowerLimitY
= 0.1f
;
69 g_lineOne
.end
.fUpperLimitY
= 0.9f
;
71 g_lineTwo
.start
.fX
= 0.75f
;
72 g_lineTwo
.start
.fY
= 0.1f
;
73 g_lineTwo
.start
.bGrowX
= FALSE
;
74 g_lineTwo
.start
.bGrowY
= TRUE
;
75 g_lineTwo
.start
.fStepX
= 0.01f
;
76 g_lineTwo
.start
.fStepY
= 0.025f
;
77 g_lineTwo
.start
.fLowerLimitX
= 0.1f
;
78 g_lineTwo
.start
.fUpperLimitX
= 0.9f
;
79 g_lineTwo
.start
.fLowerLimitY
= 0.1f
;
80 g_lineTwo
.start
.fUpperLimitY
= 0.9f
;
82 g_lineTwo
.end
.fX
= 0.8f
;
83 g_lineTwo
.end
.fY
= 0.8f
;
84 g_lineTwo
.end
.bGrowX
= FALSE
;
85 g_lineTwo
.end
.bGrowY
= FALSE
;
86 g_lineTwo
.end
.fStepX
= 0.01f
;
87 g_lineTwo
.end
.fStepY
= 0.01f
;
88 g_lineTwo
.end
.fLowerLimitX
= 0.1f
;
89 g_lineTwo
.end
.fUpperLimitX
= 0.9f
;
90 g_lineTwo
.end
.fLowerLimitY
= 0.1f
;
91 g_lineTwo
.end
.fUpperLimitY
= 0.9f
;
93 /* init gtk+, GL and glut */
94 gtk_init (&argc
,&argv
);
95 gtk_gl_init (&argc
,&argv
);
96 glutInit (&argc
, argv
);
98 /* setup GL-context */
99 pGlConfig
= gdk_gl_config_new_by_mode (GDK_GL_MODE_RGB
|
106 g_print ("Could not setup GL-context!\n");
110 /* create window and hook up event-handlers */
111 pWindow
= gtk_window_new (GTK_WINDOW_TOPLEVEL
);
114 g_print ("Could not create gtk+-window!\n");
118 gtk_widget_add_events (pWindow
,
119 GDK_POINTER_MOTION_MASK
|
120 GDK_BUTTON_PRESS_MASK
|
121 GDK_BUTTON_RELEASE_MASK
);
123 g_signal_connect (G_OBJECT (pWindow
),
125 G_CALLBACK (delete_handler
),
127 g_signal_connect (G_OBJECT (pWindow
),
128 "button-press-event",
129 G_CALLBACK (button_handler
),
131 g_signal_connect (G_OBJECT (pWindow
),
132 "button-release-event",
133 G_CALLBACK (button_handler
),
135 g_signal_connect (G_OBJECT (pWindow
),
137 G_CALLBACK (screen_changed_handler
),
139 g_signal_connect (G_OBJECT (pWindow
),
141 G_CALLBACK (scroll_handler
),
143 g_signal_connect (G_OBJECT (pWindow
),
145 G_CALLBACK (key_press_handler
),
148 pDrawingArea
= gtk_drawing_area_new ();
151 g_print ("Could not create drawing-area!\n");
157 gtk_widget_set_size_request (pDrawingArea
, g_iWidth
, g_iHeight
);
158 gtk_widget_set_gl_capability (pDrawingArea
,
164 g_signal_connect_after (G_OBJECT (pDrawingArea
),
166 G_CALLBACK (realize_handler
),
168 g_signal_connect (G_OBJECT (pDrawingArea
),
170 G_CALLBACK (configure_handler
),
172 g_signal_connect (G_OBJECT (pDrawingArea
),
174 G_CALLBACK (expose_handler
),
176 g_signal_connect (G_OBJECT (pWindow
),
177 "motion-notify-event",
178 G_CALLBACK (motion_notify_handler
),
179 (gpointer
) pDrawingArea
);
181 gtk_container_add (GTK_CONTAINER (pWindow
), pDrawingArea
);
182 gtk_widget_show (pDrawingArea
);
183 gtk_window_set_resizable (GTK_WINDOW (pWindow
), FALSE
);
184 gtk_widget_set_app_paintable (pWindow
, TRUE
);
185 gtk_window_set_decorated (GTK_WINDOW (pWindow
), FALSE
);
186 screen_changed_handler (pWindow
, NULL
, NULL
);
187 gtk_widget_show (pWindow
);
189 /* create cairo-surface/context to act as OpenGL-texture */
190 g_pucSurfaceData
[0] = g_malloc0 (4 * g_iWidth
* g_iHeight
);
191 g_pucSurfaceData
[1] = g_malloc0 (4 * g_iWidth
* g_iHeight
);
192 g_pucSurfaceData
[2] = g_malloc0 (4 * g_iWidth
* g_iHeight
);
193 if (g_pucSurfaceData
[0] && g_pucSurfaceData
[1] && g_pucSurfaceData
[2])
195 pCairoSurface
[0] = cairo_image_surface_create_for_data (g_pucSurfaceData
[0],
200 pCairoSurface
[1] = cairo_image_surface_create_for_data (g_pucSurfaceData
[1],
205 pCairoSurface
[2] = cairo_image_surface_create_for_data (g_pucSurfaceData
[2],
211 g_pCairoContext
[0] = cairo_create (pCairoSurface
[0]);
212 g_pCairoContext
[1] = cairo_create (pCairoSurface
[1]);
213 g_pCairoContext
[2] = cairo_create (pCairoSurface
[2]);
216 /* force a refresh-rate of 20 Hz */
217 uiDrawHandlerId
= g_timeout_add (50,
218 (GSourceFunc
) draw_handler
,
221 /* register timer used by fps-counter */
222 g_pTimerId
= g_timer_new ();
224 /* enter event-loop */
227 /* clear resources before exit */
228 if (g_pucSurfaceData
[0])
229 g_free (g_pucSurfaceData
[0]);
230 if (g_pucSurfaceData
[1])
231 g_free (g_pucSurfaceData
[1]);
232 if (g_pucSurfaceData
[2])
233 g_free (g_pucSurfaceData
[2]);