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[438/906] glfilterreflectedscreen: improve behavior and add some properties

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Fixes bug #612163
This commit is contained in:
Pierre Pouzol 2010-04-27 11:07:04 +02:00 committed by Matthew Waters
parent 7660fcbd30
commit f8871ff33a
2 changed files with 253 additions and 79 deletions
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320
gst/gl/gstglfilterreflectedscreen.c
View file

@ -26,7 +26,7 @@
* <refsect2>
* <title>Examples</title>
* |[
* gst-launch -v videotestsrc ! glupload ! glfilterreflectedscreen active_graphic_mode=TRUE ! glimagesink
* gst-launch videotestsrc ! glupload ! glfilterreflectedscreen ! glimagesink
* ]|
* </refsect2>
*/
@ -44,7 +44,13 @@ GST_DEBUG_CATEGORY_STATIC (GST_CAT_DEFAULT);
enum
{
PROP_0,
PROP_ACTIVE_GRAPHIC_MODE
PROP_ACTIVE_GRAPHIC_MODE,
PROP_SEPARATED_SCREEN,
PROP_SHOW_FLOOR,
PROP_FOVY,
PROP_ASPECT,
PROP_ZNEAR,
PROP_ZFAR
};
#define DEBUG_INIT(bla) \
@ -62,13 +68,20 @@ static void gst_gl_filter_reflected_screen_get_property (GObject * object,
static gboolean gst_gl_filter_reflected_screen_filter (GstGLFilter * filter,
GstGLBuffer * inbuf, GstGLBuffer * outbuf);
static void gst_gl_filter_reflected_screen_draw_background ();
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_draw_separated_screen (GstGLFilter *
filter, gint width, gint height, guint texture, gfloat alphs, gfloat alphe);
static void gst_gl_filter_reflected_screen_callback (gint width, gint height,
guint texture, gpointer stuff);
static GLfloat LightPos[] = { 4.0f, -4.0f, 6.0f, 1.0f }; // Light Position
static GLfloat LightAmb[] = { 4.0f, 4.0f, 4.0f, 1.0f }; // Ambient Light
static GLfloat LightDif[] = { 1.0f, 1.0f, 1.0f, 1.0f }; // Diffuse Light
static void
gst_gl_filter_reflected_screen_base_init (gpointer klass)
{
@ -96,14 +109,49 @@ gst_gl_filter_reflected_screen_class_init (GstGLFilterReflectedScreenClass *
"Activate graphic mode",
"Allow user to activate stencil buffer and blending.",
TRUE, G_PARAM_READWRITE));
g_object_class_install_property (gobject_class, PROP_SEPARATED_SCREEN,
g_param_spec_boolean ("separated_screen",
"Create a separation space",
"Allow to insert a space between the two screen. Will cancel 'show floor' if active. Value are TRUE or FALSE(default)",
FALSE, G_PARAM_READWRITE));
g_object_class_install_property (gobject_class, PROP_SHOW_FLOOR,
g_param_spec_boolean ("show_floor",
"Show the support",
"Allow the user to show the supportive floor. Will cancel 'separated screen' if active. Value are TRUE(default) or FALSE",
TRUE, G_PARAM_READWRITE));
g_object_class_install_property (gobject_class, PROP_FOVY,
g_param_spec_double ("fovy", "Fovy", "Field of view angle in degrees",
0.0, 180.0, 60, G_PARAM_WRITABLE));
g_object_class_install_property (gobject_class, PROP_ASPECT,
g_param_spec_double ("aspect", "Aspect",
"Field of view in the x direction", 0.0, 100, 0.0, G_PARAM_WRITABLE));
g_object_class_install_property (gobject_class, PROP_ZNEAR,
g_param_spec_double ("znear", "Znear",
"Specifies the distance from the viewer to the near clipping plane",
0.0, 100.0, 0.1, G_PARAM_WRITABLE));
g_object_class_install_property (gobject_class, PROP_ZFAR,
g_param_spec_double ("zfar", "Zfar",
"Specifies the distance from the viewer to the far clipping plane",
0.0, 1000.0, 100.0, G_PARAM_WRITABLE));
}
static void
gst_gl_filter_reflected_screen_init (GstGLFilterReflectedScreen * filter,
GstGLFilterReflectedScreenClass * klass)
{
filter->timestamp = 0;
filter->active_graphic_mode = TRUE;
filter->separated_screen = FALSE;
filter->show_floor = TRUE;
filter->fovy = 80;
filter->aspect = 0;
filter->znear = 0.1;
filter->zfar = 1000;
}
static void
@ -114,10 +162,26 @@ gst_gl_filter_reflected_screen_set_property (GObject * object, guint prop_id,
switch (prop_id) {
case PROP_ACTIVE_GRAPHIC_MODE:
{
filter->active_graphic_mode = g_value_get_boolean (value);
break;
}
case PROP_SEPARATED_SCREEN:
filter->separated_screen = g_value_get_boolean (value);
break;
case PROP_SHOW_FLOOR:
filter->show_floor = g_value_get_boolean (value);
break;
case PROP_FOVY:
filter->fovy = g_value_get_double (value);
break;
case PROP_ASPECT:
filter->aspect = g_value_get_double (value);
break;
case PROP_ZNEAR:
filter->znear = g_value_get_double (value);
break;
case PROP_ZFAR:
filter->zfar = g_value_get_double (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
@ -134,6 +198,12 @@ gst_gl_filter_reflected_screen_get_property (GObject * object, guint prop_id,
case PROP_ACTIVE_GRAPHIC_MODE:
g_value_set_boolean (value, filter->active_graphic_mode);
break;
case PROP_SEPARATED_SCREEN:
g_value_set_boolean (value, filter->separated_screen);
break;
case PROP_SHOW_FLOOR:
g_value_set_boolean (value, filter->show_floor);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
@ -144,28 +214,72 @@ 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);
GstGLFilterReflectedScreen *reflected_screen_filter =
GST_GL_FILTER_REFLECTED_SCREEN (filter);
if (reflected_screen_filter->aspect == 0.0)
reflected_screen_filter->aspect =
(gfloat) (filter->width) / (gfloat) (filter->height);
//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,
inbuf->texture, reflected_screen_filter->fovy,
reflected_screen_filter->aspect, reflected_screen_filter->znear,
reflected_screen_filter->zfar, GST_GL_DISPLAY_PROJECTION_PERSPECTIVE,
(gpointer) reflected_screen_filter);
return TRUE;
}
static gint64
get_time (void)
static void
gst_gl_filter_reflected_screen_draw_separated_screen (GstGLFilter * filter,
gint width, gint height, guint texture, gfloat alphs, gfloat alphe)
{
static GTimeVal val;
g_get_current_time (&val);
//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);
return (val.tv_sec * G_USEC_PER_SEC) + val.tv_usec;
//creating screen and setting the texture (depending on texture's height and width)
glBegin (GL_QUADS);
// right Face
glColor4f (1.0f, 1.0f, 1.0f, alphs);
glTexCoord2f ((gfloat) (width / 2.0), (gfloat) height);
glVertex3f (-0.75f, 0.0f, -1.0f);
glColor4f (1.0f, 1.0f, 1.0f, alphe);
glTexCoord2f ((gfloat) (width / 2.0), 0.0f);
glVertex3f (-0.75f, 1.25f, -1.0f);
glTexCoord2f ((gfloat) width, 0.0f);
glVertex3f (1.25f, 1.25f, -1.0f);
glColor4f (1.0f, 1.0f, 1.0f, alphs);
glTexCoord2f ((gfloat) width, (gfloat) height);
glVertex3f (1.25f, 0.0f, -1.0f);
// Left Face
glColor4f (1.0f, 1.0f, 1.0f, alphs);
glTexCoord2f (((gfloat) width / 2.0f), (gfloat) height);
glVertex3f (-1.0f, 0.0f, -0.75f);
glTexCoord2f (0.0f, (gfloat) height);
glVertex3f (-1.0f, 0.0f, 1.25f);
glColor4f (1.0f, 1.0f, 1.0f, alphe);
glTexCoord2f (0.0f, 0.0f);
glVertex3f (-1.0f, 1.25f, 1.25f);
glTexCoord2f (((gfloat) width / 2.0f), 0.0f);
glVertex3f (-1.0f, 1.25f, -0.75f);
glEnd ();
glDisable (GL_TEXTURE_RECTANGLE_ARB);
}
static void
@ -185,28 +299,26 @@ gst_gl_filter_reflected_screen_draw_screen (GstGLFilter * filter,
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);
glTexCoord2f ((gfloat) (width / 2.0), (gfloat) height);
glVertex3f (-1.0f, 0.0f, -1.0f);
glTexCoord2f (0.0f, 0.0f);
glTexCoord2f ((gfloat) (width / 2.0), 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);
glTexCoord2f (((gfloat) width / 2.0f), (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);
glTexCoord2f (((gfloat) width / 2.0f), 0.0f);
glVertex3f (-1.0f, 1.0f, -1.0f);
glEnd ();
@ -215,6 +327,24 @@ gst_gl_filter_reflected_screen_draw_screen (GstGLFilter * filter,
glDisable (GL_TEXTURE_RECTANGLE_ARB);
}
static void
gst_gl_filter_reflected_screen_draw_background ()
{
glBegin (GL_QUADS);
// right Face
glColor4f (0.0f, 0.0f, 0.0f, 1.0f);
glVertex3f (-10.0f, -10.0f, -1.0f);
glColor4f (0.0f, 0.0f, 0.2f, 1.0f);
glVertex3f (-10.0f, 10.0f, -1.0f);
glVertex3f (10.0f, 10.0f, -1.0f);
glVertex3f (10.0f, -10.0f, -1.0f);
glEnd ();
}
static void
gst_gl_filter_reflected_screen_draw_floor ()
{
@ -226,7 +356,7 @@ gst_gl_filter_reflected_screen_draw_floor ()
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, 1);
gluDisk (q, 0.0, 2.2, 50.0, 1.0);
}
//opengl scene, params: input texture (not the output filter->texture)
@ -243,64 +373,104 @@ gst_gl_filter_reflected_screen_callback (gint width, gint height, guint texture,
//load identity befor tracing
glLoadIdentity ();
//camera translation
glTranslatef (0.0f, 0.1f, -1.5f);
glTranslatef (0.0f, 0.1f, -1.3f);
//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->separated_screen)
gluLookAt (0.1, -0.25, 2.0, 0.025, 0.0, 0.0, 0.0, 1.0, 0.0);
else
gluLookAt (0.1, -0.35, 2.0, 0.025, 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);
gst_gl_filter_reflected_screen_draw_background ();
if (reflected_screen_filter->separated_screen) {
glEnable (GL_BLEND);
//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)
glScalef (1.0f, -1.0f, 1.0f);
glTranslatef (0.0f, 0.0f, 1.2f);
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
gst_gl_filter_reflected_screen_draw_separated_screen (filter, width, height,
texture, 1.0f, 1.0f);
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);
if (reflected_screen_filter->active_graphic_mode) {
//configuration of the transparency function
glBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glTranslatef (0.0f, 0.0f, 1.2f);
glRotatef (-45.0f, 0.0, 1.0, 0.0);
gst_gl_filter_reflected_screen_draw_separated_screen (filter, width,
height, texture, 0.5f, 0.0f);
glDisable (GL_BLEND);
}
}
if (reflected_screen_filter->show_floor) {
glLightfv (GL_LIGHT0, GL_AMBIENT, LightAmb);
glLightfv (GL_LIGHT0, GL_DIFFUSE, LightDif);
glLightfv (GL_LIGHT0, GL_POSITION, LightPos);
//enable lighting
glEnable (GL_LIGHT0);
glEnable (GL_LIGHTING);
if (reflected_screen_filter->active_graphic_mode) {
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 ();
glLightfv (GL_LIGHT0, GL_POSITION, LightPos);
//translate the object on z axis
glTranslatef (0.0f, 0.0f, 1.4f);
//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);
glDisable (GL_LIGHTING);
//specified a white color (for the floor) with 20% transparency
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)
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);
glEnable (GL_LIGHTING);
//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, 1.4f);
glRotatef (-45.0f, 0.0, 1.0, 0.0);
gst_gl_filter_reflected_screen_draw_screen (filter, width, height, texture);
glDisable (GL_LIGHTING);
}
}

8
gst/gl/gstglfilterreflectedscreen.h
View file

@ -38,10 +38,14 @@ typedef struct _GstGLFilterReflectedScreenClass GstGLFilterReflectedScreenClass;
struct _GstGLFilterReflectedScreen
{
GstGLFilter filter;
GstGLShader *shader;
gint64 timestamp;
gdouble fovy;
gdouble aspect;
gdouble znear;
gdouble zfar;
gboolean active_graphic_mode;
gboolean separated_screen;
gboolean show_floor;
};
struct _GstGLFilterReflectedScreenClass