[grits] Make picking 64-bit compatible

[Andy Spencer <andys src gnome org>]

commit 1580469d408a4f63631e6ce14528f1152502a144
Author: Andy Spencer <andy753421 gmail com>
Date:   Thu Nov 24 09:23:12 2011 +0000

    Make picking 64-bit compatible
    
    Use an array and index into that instead of passing pointers to
    glPushName since 64-bit pointers do not fit in the name stack.

 src/grits-opengl.c         |   32 ++++++++++++++++++++++++++++----
 src/objects/grits-object.c |   33 +++++++++++++--------------------
 src/objects/grits-object.h |    5 ++---
 3 files changed, 43 insertions(+), 27 deletions(-)
---
diff --git a/src/grits-opengl.c b/src/grits-opengl.c
index 277c11e..b51e767 100644
--- a/src/grits-opengl.c
+++ b/src/grits-opengl.c
@@ -142,6 +142,18 @@ static void _foreach_object(GritsOpenGL *opengl, GFunc func, gpointer user_data)
 	g_tree_foreach(opengl->objects, _foreach_object_cb, pointers);
 }
 
+static void _add_object(GritsObject *object, GPtrArray *array)
+{
+	g_ptr_array_add(array, object);
+}
+
+static GPtrArray *_objects_to_array(GritsOpenGL *opengl)
+{
+	GPtrArray *array = g_ptr_array_new();
+	_foreach_object(opengl, (GFunc)_add_object, array);
+	return array;
+}
+
 /*************
  * Callbacks *
  *************/
@@ -255,7 +267,14 @@ static gboolean on_motion_notify(GritsOpenGL *opengl, GdkEventMotion *event, gpo
 
 	/* Run picking */
 	g_mutex_lock(opengl->objects_lock);
-	_foreach_object(opengl, (GFunc)grits_object_pick_begin, opengl);
+	GPtrArray *objects = _objects_to_array(opengl);
+	for (guint i = 0; i < objects->len; i++) {
+		glPushName(i);
+		GritsObject *object = objects->pdata[i];
+		object->state.picked = FALSE;
+		grits_object_pick(object, opengl);
+		glPopName();
+	}
 	int hits = glRenderMode(GL_RENDER);
 	g_debug("GritsOpenGL: on_motion_notify - hits=%d ev=%.0lf,%.0lf",
 			hits, gl_x, gl_y);
@@ -265,10 +284,15 @@ static gboolean on_motion_notify(GritsOpenGL *opengl, GdkEventMotion *event, gpo
 		//g_debug("\t\tz1:    %f", (float)buffer[i][1]/0x7fffffff);
 		//g_debug("\t\tz2:    %f", (float)buffer[i][2]/0x7fffffff);
 		//g_debug("\t\tname:  %p", (gpointer)buffer[i][3]);
-		GritsObject *object = GRITS_OBJECT(buffer[i][3]);
-		grits_object_pick_pointer(object, gl_x, gl_y);
+		guint        index  = buffer[i][3];
+		GritsObject *object = objects->pdata[index];
+		object->state.picked = TRUE;
+	}
+	for (guint i = 0; i < objects->len; i++) {
+		GritsObject *object = objects->pdata[i];
+		grits_object_set_pointer(object, object->state.picked);
 	}
-	_foreach_object(opengl, (GFunc)grits_object_pick_end, NULL);
+	g_ptr_array_free(objects, TRUE);
 	g_mutex_unlock(opengl->objects_lock);
 
 	/* Cleanup */
diff --git a/src/objects/grits-object.c b/src/objects/grits-object.c
index d3f200c..a3b60ec 100644
--- a/src/objects/grits-object.c
+++ b/src/objects/grits-object.c
@@ -51,6 +51,7 @@ static guint signals[NUM_SIGNALS];
 void grits_object_pickdraw(GritsObject *object, GritsOpenGL *opengl, gboolean pick)
 {
 	GritsObjectClass *klass = GRITS_OBJECT_GET_CLASS(object);
+
 	if (!klass->draw) {
 		g_warning("GritsObject: draw - Unimplemented");
 		return;
@@ -60,6 +61,14 @@ void grits_object_pickdraw(GritsObject *object, GritsOpenGL *opengl, gboolean pi
 	if (object->hidden)
 		return;
 
+	/* Skip object with no signals when picking */
+	for (int i = 0; pick; i++) {
+		if (g_signal_has_handler_pending(object, signals[i], 0, FALSE))
+			break;
+		if (i == NUM_SIGNALS)
+			return;
+	}
+
 	/* Support GritsTester */
 	if (!GRITS_IS_OPENGL(opengl)) {
 		g_debug("GritsObject: draw - drawing raw object");
@@ -157,30 +166,14 @@ void grits_object_queue_draw(GritsObject *object)
 }
 
 /* Event handling */
-void grits_object_pick_begin(GritsObject *object, GritsOpenGL *opengl)
-{
-	object->state.picked = FALSE;
-
-	/* Check for connected signals */
-	for (int i = 0; i < NUM_SIGNALS; i++) {
-		if (g_signal_has_handler_pending(object, signals[i], 0, FALSE)) {
-			/* Someone is watching, render the object _once_ */
-			glPushName((guint)object);
-			grits_object_pickdraw(object, opengl, TRUE);
-			glPopName();
-			return;
-		}
-	}
-}
-
-void grits_object_pick_pointer(GritsObject *object, double x, double y)
+void grits_object_pick(GritsObject *object, GritsOpenGL *opengl)
 {
-	object->state.picked = TRUE;
+	grits_object_pickdraw(object, opengl, TRUE);
 }
 
-void grits_object_pick_end(GritsObject *object)
+void grits_object_set_pointer(GritsObject *object, gboolean selected)
 {
-	if (object->state.picked) {
+	if (selected) {
 		if (!object->state.selected)
 			g_signal_emit(object, signals[SIG_ENTER], 0);
 		object->state.selected = TRUE;
diff --git a/src/objects/grits-object.h b/src/objects/grits-object.h
index 440a1df..d7b8b03 100644
--- a/src/objects/grits-object.h
+++ b/src/objects/grits-object.h
@@ -76,9 +76,8 @@ void grits_object_draw(GritsObject *object, GritsOpenGL *opengl);
 void grits_object_hide(GritsObject *object, gboolean hidden);
 
 /* Interal, used by grits_opengl */
-void grits_object_pick_begin(GritsObject *object, GritsOpenGL *opengl);
-void grits_object_pick_pointer(GritsObject *object, double x, double y);
-void grits_object_pick_end(GritsObject *object);
+void grits_object_pick(GritsObject *object, GritsOpenGL *opengl);
+void grits_object_set_pointer(GritsObject *object, gboolean selected);
 void grits_object_event(GritsObject *object, GdkEvent *event);
 
 /**