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[245/906] Add invert property to sobel filter

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Add an invert property to sobel_fragment_source and Sobel filter. Useful
to have dark edges with white background.
This commit is contained in:
Filippo Argiolas 2008-10-15 15:49:12 +02:00 committed by Matthew Waters
parent b9cd64e83c
commit a729d080f4
2 changed files with 36 additions and 8 deletions
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2
gst/gl/effects/gstgleffectssources.c
View file

@ -192,6 +192,7 @@ const gchar *sobel_fragment_source =
"uniform sampler2DRect tex;"
"uniform float hkern[9];"
"uniform float vkern[9];"
"uniform bool invert;"
"void main () {"
" vec2 offset[9] = vec2[9] ( vec2(-1.0,-1.0), vec2( 0.0,-1.0), vec2( 1.0,-1.0),"
" vec2(-1.0, 0.0), vec2( 0.0, 0.0), vec2( 1.0, 0.0),"
@ -210,6 +211,7 @@ const gchar *sobel_fragment_source =
" }"
" }"
" float g = sqrt(gx*gx + gy*gy);"
" if (invert) g = 1.0 - g;"
" gl_FragColor = vec4(vec3(g), 1.0);"
"}";

30
gst/gl/gstglfiltersobel.c
View file

@ -40,6 +40,8 @@ struct _GstGLFilterSobel
GstGLFilter filter;
GstGLShader *shader0;
gboolean invert;
GLuint midtexture;
};
@ -48,6 +50,12 @@ struct _GstGLFilterSobelClass
GstGLFilterClass filter_class;
};
enum
{
PROP_0,
PROP_INVERT,
};
GType gst_gl_glfiltersobel_get_type (void);
#define GST_CAT_DEFAULT gst_gl_filtersobel_debug
@ -122,6 +130,15 @@ gst_gl_filtersobel_class_init (GstGLFilterSobelClass * klass)
GST_GL_FILTER_CLASS (klass)->display_reset_cb = gst_gl_filtersobel_reset_resources;
GST_GL_FILTER_CLASS (klass)->onInitFBO = gst_gl_filtersobel_init_shader;
GST_GL_FILTER_CLASS (klass)->onReset = gst_gl_filter_filtersobel_reset;
g_object_class_install_property (
gobject_class,
PROP_INVERT,
g_param_spec_boolean ("invert",
"Invert the colors",
"Invert colors to get dark edges on bright background",
FALSE,
G_PARAM_READWRITE));
}
static void
@ -129,6 +146,7 @@ gst_gl_filtersobel_init (GstGLFilterSobel * filtersobel, GstGLFilterSobelClass *
{
filtersobel->shader0 = NULL;
filtersobel->midtexture = 0;
filtersobel->invert = FALSE;
}
static void
@ -144,9 +162,12 @@ static void
gst_gl_filtersobel_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
/* GstGLFilterSobel *filtersobel = GST_GL_FILTERSOBEL (object); */
GstGLFilterSobel *filtersobel = GST_GL_FILTERSOBEL (object);
switch (prop_id) {
case PROP_INVERT:
filtersobel->invert = g_value_get_boolean (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
@ -157,9 +178,12 @@ static void
gst_gl_filtersobel_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
/* GstGLFilterSobel *filtersobel = GST_GL_FILTERSOBEL (object); */
GstGLFilterSobel *filtersobel = GST_GL_FILTERSOBEL (object);
switch (prop_id) {
case PROP_INVERT:
g_value_set_boolean (value, filtersobel->invert);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
@ -260,5 +284,7 @@ gst_gl_filtersobel_callback (gint width, gint height, guint texture, gpointer st
gst_gl_shader_set_uniform_1fv (filtersobel->shader0, "hkern", 9, hkern);
gst_gl_shader_set_uniform_1fv (filtersobel->shader0, "vkern", 9, vkern);
gst_gl_shader_set_uniform_1i (filtersobel->shader0, "invert", filtersobel->invert);
gst_gl_filtersobel_draw_texture (filtersobel, texture);
}