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glcolorscale: use a shader on GLESv2

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Otherwise you only see black frames

Fix https://bugzilla.gnome.org/show_bug.cgi?id=728947
This commit is contained in:
Julien Isorce 2014-04-30 17:30:06 +01:00 committed by Tim-Philipp Müller
parent 0455cb610a
commit 2a12e57a9f
2 changed files with 76 additions and 2 deletions
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74
ext/gl/gstglcolorscale.c
View file

@ -70,10 +70,17 @@ static void gst_gl_colorscale_set_property (GObject * object, guint prop_id,
static void gst_gl_colorscale_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
#if GST_GL_HAVE_GLES2
static gboolean gst_gl_colorscale_gen_gl_resources (GstGLFilter * filter);
static void gst_gl_colorscale_del_gl_resources (GstGLFilter * filter);
#endif
static gboolean gst_gl_colorscale_filter_texture (GstGLFilter * filter,
guint in_tex, guint out_tex);
#if GST_GL_HAVE_OPENGL
static void gst_gl_colorscale_callback (gint width, gint height,
guint texture, gpointer stuff);
#endif
static void
gst_gl_colorscale_class_init (GstGLColorscaleClass * klass)
@ -93,12 +100,21 @@ gst_gl_colorscale_class_init (GstGLColorscaleClass * klass)
"Filter/Effect/Video", "Colorspace converter and video scaler",
"Julien Isorce <julien.isorce@gmail.com>");
#if GST_GL_HAVE_GLES2
filter_class->onInitFBO =
GST_DEBUG_FUNCPTR (gst_gl_colorscale_gen_gl_resources);
filter_class->onStop = GST_DEBUG_FUNCPTR (gst_gl_colorscale_del_gl_resources);
#endif
filter_class->filter_texture = gst_gl_colorscale_filter_texture;
}
static void
gst_gl_colorscale_init (GstGLColorscale * colorscale)
{
#if GST_GL_HAVE_GLES2
colorscale->shader = NULL;
#endif
}
static void
@ -123,6 +139,53 @@ gst_gl_colorscale_get_property (GObject * object, guint prop_id,
}
}
#if GST_GL_HAVE_GLES2
static void
_compile_identity_shader (GstGLContext * context, GstGLColorscale * colorscale)
{
GstGLFilter *filter = GST_GL_FILTER (colorscale);
colorscale->shader = gst_gl_shader_new (context);
if (!gst_gl_shader_compile_with_default_vf_and_check (colorscale->shader,
&filter->draw_attr_position_loc, &filter->draw_attr_texture_loc)) {
gst_gl_context_clear_shader (context);
gst_object_unref (colorscale->shader);
colorscale->shader = NULL;
}
}
static gboolean
gst_gl_colorscale_gen_gl_resources (GstGLFilter * filter)
{
GstGLColorscale *colorscale = GST_GL_COLORSCALE (filter);
gst_gl_context_thread_add (filter->context,
(GstGLContextThreadFunc) _compile_identity_shader, colorscale);
if (!colorscale->shader) {
gst_gl_context_set_error (filter->context,
"Failed to initialize identity shader");
GST_ELEMENT_ERROR (colorscale, RESOURCE, NOT_FOUND, ("%s",
gst_gl_context_get_error ()), (NULL));
return FALSE;
}
return TRUE;
}
static void
gst_gl_colorscale_del_gl_resources (GstGLFilter * filter)
{
GstGLColorscale *colorscale = GST_GL_COLORSCALE (filter);
if (colorscale->shader) {
gst_gl_context_del_shader (filter->context, colorscale->shader);
colorscale->shader = NULL;
}
}
#endif
static gboolean
gst_gl_colorscale_filter_texture (GstGLFilter * filter, guint in_tex,
guint out_tex)
@ -131,26 +194,33 @@ gst_gl_colorscale_filter_texture (GstGLFilter * filter, guint in_tex,
colorscale = GST_GL_COLORSCALE (filter);
#if GST_GL_HAVE_GLES2
gst_gl_filter_render_to_target_with_shader (filter, TRUE, in_tex, out_tex,
colorscale->shader);
#endif
#if GST_GL_HAVE_OPENGL
gst_gl_filter_render_to_target (filter, TRUE, in_tex, out_tex,
gst_gl_colorscale_callback, colorscale);
#endif
return TRUE;
}
#if GST_GL_HAVE_OPENGL
static void
gst_gl_colorscale_callback (gint width, gint height, guint texture,
gpointer stuff)
{
GstGLFilter *filter = GST_GL_FILTER (stuff);
#if GST_GL_HAVE_OPENGL
if (gst_gl_context_get_gl_api (filter->context) & GST_GL_API_OPENGL) {
const GstGLFuncs *gl = filter->context->gl_vtable;
gl->MatrixMode (GL_PROJECTION);
gl->LoadIdentity ();
}
#endif
gst_gl_filter_draw_texture (filter, texture, width, height);
}
#endif

4
ext/gl/gstglcolorscale.h
View file

@ -42,6 +42,10 @@ typedef struct _GstGLColorscaleClass GstGLColorscaleClass;
struct _GstGLColorscale
{
GstGLFilter filter;
#if GST_GL_HAVE_GLES2
GstGLShader *shader;
#endif
};
struct _GstGLColorscaleClass