glfilterreflectedscreen: forgot to add sources

2 files changed, 378 insertions, 0 deletions

diff --git a/gst/gl/gstglfilterreflectedscreen.c b/gst/gl/gstglfilterreflectedscreen.c
new file mode 100644
index 0000000..2ad2d1d
--- /dev/null
+++ b/gst/gl/gstglfilterreflectedscreen.c
@@ -0,0 +1,321 @@
+/*
+ * GStreamer
+ * Copyright (C) 2008 Pierre Pouzol<pierre.pouzol@hotmail.fr>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+/**
+ * SECTION:element-glfilterreflectedscreen
+ *
+ * Map Video Texture upon a screen, on a reflecting surface
+ *
+ * <refsect2>
+ * <title>Examples</title>
+ * |[
+ * gst-launch -v videotestsrc ! glupload ! glfilterreflectedscreen active_graphic_mode=TRUE ! glimagesink
+ * ]|
+ * </refsect2>
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <math.h>
+#include "gstglfilterreflectedscreen.h"
+
+#define GST_CAT_DEFAULT gst_gl_filter_reflected_screen_debug
+GST_DEBUG_CATEGORY_STATIC (GST_CAT_DEFAULT);
+
+enum
+{
+  PROP_0,
+  PROP_ACTIVE_GRAPHIC_MODE
+};
+
+#define DEBUG_INIT(bla)							\
+  GST_DEBUG_CATEGORY_INIT (gst_gl_filter_reflected_screen_debug, "glfilterreflectedscreen", 0, "glfilterreflectedscreen element");
+
+GST_BOILERPLATE_FULL (GstGLFilterReflectedScreen,
+    gst_gl_filter_reflected_screen, GstGLFilter, GST_TYPE_GL_FILTER,
+    DEBUG_INIT);
+
+static void gst_gl_filter_reflected_screen_set_property (GObject * object,
+    guint prop_id, const GValue * value, GParamSpec * pspec);
+static void gst_gl_filter_reflected_screen_get_property (GObject * object,
+    guint prop_id, GValue * value, GParamSpec * pspec);
+
+static gboolean gst_gl_filter_reflected_screen_filter (GstGLFilter * filter,
+    GstGLBuffer * inbuf, GstGLBuffer * outbuf);
+
+static void gst_gl_filter_reflected_screen_draw_floor ();
+static void gst_gl_filter_reflected_screen_draw_screen (GstGLFilter * filter,
+    gint width, gint height, guint texture);
+
+static void gst_gl_filter_reflected_screen_callback (gint width, gint height,
+    guint texture, gpointer stuff);
+
+static void
+gst_gl_filter_reflected_screen_base_init (gpointer klass)
+{
+  GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
+
+  gst_element_class_set_details_simple (element_class,
+      "OpenGL Reflected Screen filter", "Filter/Effect",
+      "Reflected Screen Filter", "Pierre POUZOL <pierre.pouzol@hotmail.fr>");
+}
+
+static void
+gst_gl_filter_reflected_screen_class_init (GstGLFilterReflectedScreenClass *
+    klass)
+{
+  GObjectClass *gobject_class;
+
+  gobject_class = (GObjectClass *) klass;
+  gobject_class->set_property = gst_gl_filter_reflected_screen_set_property;
+  gobject_class->get_property = gst_gl_filter_reflected_screen_get_property;
+
+  GST_GL_FILTER_CLASS (klass)->filter = gst_gl_filter_reflected_screen_filter;
+
+  g_object_class_install_property (gobject_class, PROP_ACTIVE_GRAPHIC_MODE,
+      g_param_spec_boolean ("active_graphic_mode",
+          "Activate graphic mode",
+          "Allow user to activate stencil buffer and blending.",
+          TRUE, G_PARAM_READWRITE));
+}
+
+static void
+gst_gl_filter_reflected_screen_init (GstGLFilterReflectedScreen * filter,
+    GstGLFilterReflectedScreenClass * klass)
+{
+  filter->timestamp = 0;
+  filter->active_graphic_mode = TRUE;
+}
+
+static void
+gst_gl_filter_reflected_screen_set_property (GObject * object, guint prop_id,
+    const GValue * value, GParamSpec * pspec)
+{
+  GstGLFilterReflectedScreen *filter = GST_GL_FILTER_REFLECTED_SCREEN (object);
+
+  switch (prop_id) {
+    case PROP_ACTIVE_GRAPHIC_MODE:
+    {
+      filter->active_graphic_mode = g_value_get_boolean (value);
+      break;
+    }
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+      break;
+  }
+}
+
+static void
+gst_gl_filter_reflected_screen_get_property (GObject * object, guint prop_id,
+    GValue * value, GParamSpec * pspec)
+{
+  GstGLFilterReflectedScreen *filter = GST_GL_FILTER_REFLECTED_SCREEN (object);
+
+  switch (prop_id) {
+    case PROP_ACTIVE_GRAPHIC_MODE:
+      g_value_set_boolean (value, filter->active_graphic_mode);
+      break;
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+      break;
+  }
+}
+
+static gboolean
+gst_gl_filter_reflected_screen_filter (GstGLFilter * filter,
+    GstGLBuffer * inbuf, GstGLBuffer * outbuf)
+{
+  gpointer reflected_screen_filter = GST_GL_FILTER_REFLECTED_SCREEN (filter);
+  GST_GL_FILTER_REFLECTED_SCREEN (reflected_screen_filter)->timestamp =
+      GST_BUFFER_TIMESTAMP (inbuf);
+
+  //blocking call, use a FBO
+  gst_gl_display_use_fbo (filter->display, filter->width, filter->height,
+      filter->fbo, filter->depthbuffer, outbuf->texture,
+      gst_gl_filter_reflected_screen_callback, inbuf->width, inbuf->height,
+      inbuf->texture, 80, (gdouble) filter->width / (gdouble) filter->height,
+      1.0, 5000.0, GST_GL_DISPLAY_PROJECTION_PERSPECTIVE,
+      (gpointer) reflected_screen_filter);
+
+  return TRUE;
+}
+
+static gint64
+get_time (void)
+{
+  static GTimeVal val;
+  g_get_current_time (&val);
+
+  return (val.tv_sec * G_USEC_PER_SEC) + val.tv_usec;
+}
+
+static void
+gst_gl_filter_reflected_screen_draw_screen (GstGLFilter * filter,
+    gint width, gint height, guint texture)
+{
+  //enable ARB Rectangular texturing
+  //that's necessary to have the video displayed on our screen (with gstreamer)
+  glEnable (GL_TEXTURE_RECTANGLE_ARB);
+  glBindTexture (GL_TEXTURE_RECTANGLE_ARB, texture);
+  //configure parameters for the texturing
+  //the two first are used to specified how the texturing will be done if the screen is greater than the texture herself
+  glTexParameteri (GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+  glTexParameteri (GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+  //the next two specified how the texture will comport near the limits
+  glTexParameteri (GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_WRAP_S,
+      GL_CLAMP_TO_EDGE);
+  glTexParameteri (GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_WRAP_T,
+      GL_CLAMP_TO_EDGE);
+  glTexEnvi (GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
+
+  //creating screen and setting the texture (depending on texture's height and width)
+  glBegin (GL_QUADS);
+
+  // right Face
+  glTexCoord2f (0.0f, (gfloat) height);
+  glVertex3f (-1.0f, 0.0f, -1.0f);
+  glTexCoord2f (0.0f, 0.0f);
+  glVertex3f (-1.0f, 1.0f, -1.0f);
+  glTexCoord2f ((gfloat) width, 0.0f);
+  glVertex3f (1.0f, 1.0f, -1.0f);
+  glTexCoord2f ((gfloat) width, (gfloat) height);
+  glVertex3f (1.0f, 0.0f, -1.0f);
+  // Left Face
+  glTexCoord2f ((gfloat) width, (gfloat) height);
+  glVertex3f (-1.0f, 0.0f, -1.0f);
+  glTexCoord2f (0.0f, (gfloat) height);
+  glVertex3f (-1.0f, 0.0f, 1.0f);
+  glTexCoord2f (0.0f, 0.0f);
+  glVertex3f (-1.0f, 1.0f, 1.0f);
+  glTexCoord2f ((gfloat) width, 0.0f);
+  glVertex3f (-1.0f, 1.0f, -1.0f);
+
+  glEnd ();
+
+  //disable this kind of texturing (useless for the gluDisk)
+  glDisable (GL_TEXTURE_RECTANGLE_ARB);
+}
+
+static void
+gst_gl_filter_reflected_screen_draw_floor ()
+{
+  GLUquadricObj *q;
+  //create a quadric for the floor's drawing
+  q = gluNewQuadric ();
+  //configure this quadric's parameter (for lighting and texturing)
+  gluQuadricNormals (q, GL_SMOOTH);
+  gluQuadricTexture (q, GL_FALSE);
+
+  //drawing the disk. The texture are mapped thanks to the parameter we gave to the GLUquadric q
+  gluDisk (q, 0.0, 2.0, 50.0, 1.0);
+}
+
+//opengl scene, params: input texture (not the output filter->texture)
+static void
+gst_gl_filter_reflected_screen_callback (gint width, gint height, guint texture,
+    gpointer stuff)
+{
+  static gint64 start_time = 0;
+
+  GstGLFilter *filter = GST_GL_FILTER (stuff);
+  GstGLFilterReflectedScreen *reflected_screen_filter =
+      GST_GL_FILTER_REFLECTED_SCREEN (stuff);
+
+  if (start_time == 0)
+    start_time = get_time ();
+  else {
+    gint64 time_left =
+        (reflected_screen_filter->timestamp / 1000) - (get_time () -
+        start_time);
+    time_left -= 1000000 / 25;
+    if (time_left > 2000) {
+      GST_LOG ("escape");
+      return;
+    }
+  }
+
+  glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
+
+  //load identity befor tracing
+  glLoadIdentity ();
+  //camera translation
+  glTranslatef (0.0f, 0.1f, -1.5f);
+  //camera configuration
+  gluLookAt (0.1, -0.2, 1.4, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0);
+
+  if (reflected_screen_filter->active_graphic_mode) {
+    //Stencil buffer use start
+    //creation of a black mask upon the entire screen. This mean that none of the red, blue, green and alpha color on the screen will be shown
+    glColorMask (GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE);
+    //enable stencil buffer use
+    glEnable (GL_STENCIL_TEST);
+    //setting the stencil buffer. Each time a pixel will be drawn by now, this pixel value will be set to 1
+    glStencilFunc (GL_ALWAYS, 1, 1);
+    glStencilOp (GL_KEEP, GL_KEEP, GL_REPLACE);
+
+    //disable the zbuffer
+    glDisable (GL_DEPTH_TEST);
+    //make a rotation of 90 degree on x axis. By default, gluDisk draw a disk on z axis
+    glRotatef (-90.0f, 1.0, 0.0, 0.0);
+    //draw the floor. Each pixel representing this floor will now have a value of 1 on stencil buffer
+    gst_gl_filter_reflected_screen_draw_floor ();
+    //make an anti-rotation of 90 degree to draw the rest of the scene on the right angle
+    glRotatef (90.0f, 1.0, 0.0, 0.0);
+    //enable zbuffer again
+    glEnable (GL_DEPTH_TEST);
+    //enable the drawing to be shown
+    glColorMask (GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
+    //say that the next object have to be drawn ONLY where the stencil buffer's pixel's value is 1
+    glStencilFunc (GL_EQUAL, 1, 1);
+    glStencilOp (GL_KEEP, GL_KEEP, GL_KEEP);
+    //save the actual matrix
+    glPushMatrix ();
+    //translate the object on z axis
+    glTranslatef (0.0f, 0.0f, 1.3f);
+    //rotate it (because the drawing method place the user behind the left part of the screen)
+    glRotatef (-45.0f, 0.0, 1.0, 0.0);
+    //draw the reflexion
+    gst_gl_filter_reflected_screen_draw_screen (filter, width, height, texture);
+    //return to the saved matrix position
+    glPopMatrix ();
+    //end of the stencil buffer uses
+    glDisable (GL_STENCIL_TEST);
+  }
+  //enable the blending to mix the floor and reflexion color
+  glEnable (GL_BLEND);
+  glColor4f (1.0f, 1.0f, 1.0f, 0.8f);
+  //configuration of the transparency function
+  glBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+  //draw the floor (which will appear this time)
+  //specified a white color (for the floor) with 20% transparency
+  glRotatef (-90.0f, 1.0, 0.0, 0.0);
+  gst_gl_filter_reflected_screen_draw_floor ();
+  glRotatef (90.0f, 1.0, 0.0, 0.0);
+  glDisable (GL_BLEND);
+  //draw the real object
+  //scale on y axis. The object must be drawn upside down (to suggest a reflexion)
+
+  glScalef (1.0f, -1.0f, 1.0f);
+  glTranslatef (0.0f, 0.0f, 1.3f);
+  glRotatef (-45.0f, 0.0, 1.0, 0.0);
+  gst_gl_filter_reflected_screen_draw_screen (filter, width, height, texture);
+}
diff --git a/gst/gl/gstglfilterreflectedscreen.h b/gst/gl/gstglfilterreflectedscreen.h
new file mode 100644
index 0000000..a1f6e21
--- /dev/null
+++ b/gst/gl/gstglfilterreflectedscreen.h
@@ -0,0 +1,57 @@
+/* 
+ * GStreamer
+ * Copyright (C) 2008 Pierre Pouzol<pierre.pouzol@hotmail.fr>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifndef _GST_GL_FILTERREFLECTEDSCREEN_H_
+#define _GST_GL_FILTERREFLECTEDSCREEN_H_
+
+#include <gstglfilter.h>
+
+G_BEGIN_DECLS
+
+#define GST_TYPE_GL_FILTER_REFLECTED_SCREEN          (gst_gl_filter_reflected_screen_get_type())
+#define GST_GL_FILTER_REFLECTED_SCREEN(obj)            (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_GL_FILTER_REFLECTED_SCREEN,GstGLFilterReflectedScreen))
+#define GST_IS_GL_FILTER_REFLECTED_SCREEN(obj)         (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_GL_FILTER_REFLECTED_SCREEN))
+#define GST_GL_FILTER_REFLECTED_SCREEN_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST((klass) ,GST_TYPE_GL_FILTER_REFLECTED_SCREEN,GstGLFilterReflectedScreenClass))
+#define GST_IS_GL_FILTER_REFLECTED_SCREEN_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass) ,GST_TYPE_GL_FILTER_REFLECTED_SCREEN))
+#define GST_GL_FILTER_REFLECTED_SCREEN_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS((obj) ,GST_TYPE_GL_FILTER_REFLECTED_SCREEN,GstGLFilterReflectedScreenClass))
+
+typedef struct _GstGLFilterReflectedScreen GstGLFilterReflectedScreen;
+typedef struct _GstGLFilterReflectedScreenClass GstGLFilterReflectedScreenClass;
+
+struct _GstGLFilterReflectedScreen
+{
+	GstGLFilter filter;
+	GstGLShader *shader;
+	gint64 timestamp;
+	
+	gboolean active_graphic_mode;
+};
+
+struct _GstGLFilterReflectedScreenClass
+{
+	GstGLFilterClass filter_class;
+};
+
+GType gst_gl_glfilterreflectedscreen_get_type (void);
+
+G_END_DECLS
+
+#endif /* _GST_GLFILTERREFLECTEDSCREEN_H_ */
+