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glvideomixer: implement glBlendFunc and glBlendEquation

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Allows more blending options than just A over B

e.g. frame comparisons are now possible.
  glvideomixer name=m
    sink_0::zorder=0
    sink_1::zorder=1
    sink_1::blend-equation-rgb={subtract,reverse-subtract}
    sink_1::blend-function-src-rgb=src-color
    sink_1::blend-function-dst-rgb=dst-color
  ! glimagesinkelement
  videotestsrc pattern=checkers-4 ! m.sink_0
  videotestsrc pattern=checkers-8 ! m.sink_1
This commit is contained in:
Matthew Waters 2016-01-12 18:21:50 +11:00
parent 353b105816
commit afdc81fe4d
2 changed files with 500 additions and 12 deletions
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452
ext/gl/gstglvideomixer.c
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@ -71,6 +71,72 @@ gst_gl_video_mixer_background_get_type (void)
return mixer_background_type;
}
#define GST_TYPE_GL_VIDEO_MIXER_BLEND_EQUATION (gst_gl_video_mixer_blend_equation_get_type())
static GType
gst_gl_video_mixer_blend_equation_get_type (void)
{
static GType mixer_blend_equation_type = 0;
static const GEnumValue mixer_blend_equations[] = {
{GST_GL_VIDEO_MIXER_BLEND_EQUATION_ADD, "Add", "add"},
{GST_GL_VIDEO_MIXER_BLEND_EQUATION_SUBTRACT, "Subtract", "subtract"},
{GST_GL_VIDEO_MIXER_BLEND_EQUATION_REVERSE_SUBTRACT, "Reverse Subtract",
"reverse-subtract"},
{0, NULL, NULL},
};
if (!mixer_blend_equation_type) {
mixer_blend_equation_type =
g_enum_register_static ("GstGLVideoMixerBlendEquation",
mixer_blend_equations);
}
return mixer_blend_equation_type;
}
#define GST_TYPE_GL_VIDEO_MIXER_BLEND_FUNCTION (gst_gl_video_mixer_blend_function_get_type())
static GType
gst_gl_video_mixer_blend_function_get_type (void)
{
static GType mixer_blend_function_type = 0;
static const GEnumValue mixer_blend_funcs[] = {
{GST_GL_VIDEO_MIXER_BLEND_FUNCTION_ZERO, "Zero", "zero"},
{GST_GL_VIDEO_MIXER_BLEND_FUNCTION_ONE, "One", "one"},
{GST_GL_VIDEO_MIXER_BLEND_FUNCTION_SRC_COLOR, "Source Color", "src-color"},
{GST_GL_VIDEO_MIXER_BLEND_FUNCTION_ONE_MINUS_SRC_COLOR,
"One Minus Source Color", "one-minus-src-color"},
{GST_GL_VIDEO_MIXER_BLEND_FUNCTION_DST_COLOR, "Destination Color",
"dst-color"},
{GST_GL_VIDEO_MIXER_BLEND_FUNCTION_ONE_MINUS_DST_COLOR,
"One Minus Destination Color", "one-minus-dst-color"},
{GST_GL_VIDEO_MIXER_BLEND_FUNCTION_SRC_ALPHA, "Source Alpha", "src-alpha"},
{GST_GL_VIDEO_MIXER_BLEND_FUNCTION_ONE_MINUS_SRC_ALPHA,
"One Minus Source Alpha", "one-minus-src-alpha"},
{GST_GL_VIDEO_MIXER_BLEND_FUNCTION_DST_ALPHA, "Destination Alpha",
"dst-alpha"},
{GST_GL_VIDEO_MIXER_BLEND_FUNCTION_ONE_MINUS_DST_ALPHA,
"One Minus Destination Alpha", "one-minus-dst-alpha"},
{GST_GL_VIDEO_MIXER_BLEND_FUNCTION_CONSTANT_COLOR, "Constant Color",
"constant-color"},
{GST_GL_VIDEO_MIXER_BLEND_FUNCTION_ONE_MINUS_CONSTANT_COLOR,
"One Minus Constant Color", "one-minus-contant-color"},
{GST_GL_VIDEO_MIXER_BLEND_FUNCTION_CONSTANT_ALPHA, "Constant Alpha",
"constant-alpha"},
{GST_GL_VIDEO_MIXER_BLEND_FUNCTION_ONE_MINUS_CONSTANT_COLOR,
"One Minus Constant Alpha", "one-minus-contant-alpha"},
{GST_GL_VIDEO_MIXER_BLEND_FUNCTION_SRC_ALPHA_SATURATE,
"Source Alpha Saturate", "src-alpha-saturate"},
{0, NULL, NULL},
};
if (!mixer_blend_function_type) {
mixer_blend_function_type =
g_enum_register_static ("GstGLVideoMixerBlendFunction",
mixer_blend_funcs);
}
return mixer_blend_function_type;
}
typedef struct _GstGLMixerControlBindingProxy GstGLMixerControlBindingProxy;
typedef struct _GstGLMixerControlBindingProxyClass
GstGLMixerControlBindingProxyClass;
@ -223,6 +289,12 @@ gst_gl_mixer_control_binding_proxy_new (GstObject * object,
#define DEFAULT_PAD_ALPHA 1.0
#define DEFAULT_PAD_ZORDER 0
#define DEFAULT_PAD_IGNORE_EOS FALSE
#define DEFAULT_PAD_BLEND_EQUATION_RGB GST_GL_VIDEO_MIXER_BLEND_EQUATION_ADD
#define DEFAULT_PAD_BLEND_EQUATION_ALPHA GST_GL_VIDEO_MIXER_BLEND_EQUATION_ADD
#define DEFAULT_PAD_BLEND_FUNCTION_SRC_RGB GST_GL_VIDEO_MIXER_BLEND_FUNCTION_SRC_ALPHA
#define DEFAULT_PAD_BLEND_FUNCTION_SRC_ALPHA GST_GL_VIDEO_MIXER_BLEND_FUNCTION_SRC_ALPHA
#define DEFAULT_PAD_BLEND_FUNCTION_DST_RGB GST_GL_VIDEO_MIXER_BLEND_FUNCTION_ONE_MINUS_SRC_ALPHA
#define DEFAULT_PAD_BLEND_FUNCTION_DST_ALPHA GST_GL_VIDEO_MIXER_BLEND_FUNCTION_ONE_MINUS_SRC_ALPHA
enum
{
@ -232,6 +304,16 @@ enum
PROP_INPUT_WIDTH,
PROP_INPUT_HEIGHT,
PROP_INPUT_ALPHA,
PROP_INPUT_BLEND_EQUATION_RGB,
PROP_INPUT_BLEND_EQUATION_ALPHA,
PROP_INPUT_BLEND_FUNCTION_SRC_RGB,
PROP_INPUT_BLEND_FUNCTION_SRC_ALPHA,
PROP_INPUT_BLEND_FUNCTION_DST_RGB,
PROP_INPUT_BLEND_FUNCTION_DST_ALPHA,
PROP_INPUT_BLEND_FUNCTION_CONSTANT_COLOR_RED,
PROP_INPUT_BLEND_FUNCTION_CONSTANT_COLOR_GREEN,
PROP_INPUT_BLEND_FUNCTION_CONSTANT_COLOR_BLUE,
PROP_INPUT_BLEND_FUNCTION_CONSTANT_COLOR_ALPHA,
PROP_INPUT_ZORDER,
PROP_INPUT_IGNORE_EOS,
};
@ -299,6 +381,71 @@ gst_gl_video_mixer_input_class_init (GstGLVideoMixerInputClass * klass)
g_param_spec_double ("alpha", "Alpha", "Alpha of the picture", 0.0, 1.0,
DEFAULT_PAD_ALPHA,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_INPUT_BLEND_EQUATION_RGB,
g_param_spec_enum ("blend-equation-rgb", "Blend Equation RGB",
"Blend Equation for RGB",
GST_TYPE_GL_VIDEO_MIXER_BLEND_EQUATION,
DEFAULT_PAD_BLEND_EQUATION_RGB,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class,
PROP_INPUT_BLEND_EQUATION_ALPHA,
g_param_spec_enum ("blend-equation-alpha", "Blend Equation Alpha",
"Blend Equation for Alpha", GST_TYPE_GL_VIDEO_MIXER_BLEND_EQUATION,
DEFAULT_PAD_BLEND_EQUATION_ALPHA,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class,
PROP_INPUT_BLEND_FUNCTION_SRC_RGB,
g_param_spec_enum ("blend-function-src-rgb", "Blend Function Source RGB",
"Blend Function for Source RGB",
GST_TYPE_GL_VIDEO_MIXER_BLEND_FUNCTION,
DEFAULT_PAD_BLEND_FUNCTION_SRC_RGB,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class,
PROP_INPUT_BLEND_FUNCTION_SRC_ALPHA,
g_param_spec_enum ("blend-function-src-alpha",
"Blend Function Source Alpha", "Blend Function for Source Alpha",
GST_TYPE_GL_VIDEO_MIXER_BLEND_FUNCTION,
DEFAULT_PAD_BLEND_FUNCTION_SRC_ALPHA,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class,
PROP_INPUT_BLEND_FUNCTION_DST_RGB,
g_param_spec_enum ("blend-function-dst-rgb",
"Blend Function Destination RGB",
"Blend Function for Destination RGB",
GST_TYPE_GL_VIDEO_MIXER_BLEND_FUNCTION,
DEFAULT_PAD_BLEND_FUNCTION_DST_RGB,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class,
PROP_INPUT_BLEND_FUNCTION_DST_ALPHA,
g_param_spec_enum ("blend-function-dst-alpha",
"Blend Function Destination Alpha",
"Blend Function for Destiniation Alpha",
GST_TYPE_GL_VIDEO_MIXER_BLEND_FUNCTION,
DEFAULT_PAD_BLEND_FUNCTION_DST_ALPHA,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class,
PROP_INPUT_BLEND_FUNCTION_CONSTANT_COLOR_RED,
g_param_spec_double ("blend-constant-color-red",
"Blend Constant Color Red", "Blend Constant Color Red", 0.0, 1.0, 0.0,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class,
PROP_INPUT_BLEND_FUNCTION_CONSTANT_COLOR_GREEN,
g_param_spec_double ("blend-constant-color-green",
"Blend Constant Color Green", "Blend Constant Color Green", 0.0, 1.0,
0.0,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class,
PROP_INPUT_BLEND_FUNCTION_CONSTANT_COLOR_BLUE,
g_param_spec_double ("blend-constant-color-blue",
"Blend Constant Color Green", "Blend Constant Color Green", 0.0, 1.0,
0.0,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class,
PROP_INPUT_BLEND_FUNCTION_CONSTANT_COLOR_ALPHA,
g_param_spec_double ("blend-constant-color-alpha",
"Blend Constant Color Alpha", "Blend Constant Color Alpha", 0.0, 1.0,
0.0,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
}
static void
@ -336,15 +483,25 @@ _create_video_mixer_input (GstGLMixerBin * self, GstPad * mixer_pad)
}
#define ADD_PROXY_CONTROL_BINDING(prop) \
cb = gst_gl_mixer_control_binding_proxy_new (GST_OBJECT (mixer_pad), \
G_STRINGIFY (prop), GST_OBJECT (input), G_STRINGIFY (prop)); \
prop, GST_OBJECT (input), prop); \
gst_object_add_control_binding (GST_OBJECT (mixer_pad), cb)
ADD_PROXY_CONTROL_BINDING (zorder);
ADD_PROXY_CONTROL_BINDING (xpos);
ADD_PROXY_CONTROL_BINDING (ypos);
ADD_PROXY_CONTROL_BINDING (width);
ADD_PROXY_CONTROL_BINDING (height);
ADD_PROXY_CONTROL_BINDING (alpha);
ADD_PROXY_CONTROL_BINDING ("zorder");
ADD_PROXY_CONTROL_BINDING ("xpos");
ADD_PROXY_CONTROL_BINDING ("ypos");
ADD_PROXY_CONTROL_BINDING ("width");
ADD_PROXY_CONTROL_BINDING ("height");
ADD_PROXY_CONTROL_BINDING ("alpha");
ADD_PROXY_CONTROL_BINDING ("blend-equation-rgb");
ADD_PROXY_CONTROL_BINDING ("blend-equation-alpha");
ADD_PROXY_CONTROL_BINDING ("blend-function-src-rgb");
ADD_PROXY_CONTROL_BINDING ("blend-function-src-alpha");
ADD_PROXY_CONTROL_BINDING ("blend-function-dst-rgb");
ADD_PROXY_CONTROL_BINDING ("blend-function-dst-alpha");
ADD_PROXY_CONTROL_BINDING ("blend-constant-color-red");
ADD_PROXY_CONTROL_BINDING ("blend-constant-color-green");
ADD_PROXY_CONTROL_BINDING ("blend-constant-color-blue");
ADD_PROXY_CONTROL_BINDING ("blend-constant-color-alpha");
#undef ADD_PROXY_CONTROL_BINDING
@ -534,6 +691,17 @@ struct _GstGLVideoMixerPad
gint width, height;
gdouble alpha;
GstGLVideoMixerBlendEquation blend_equation_rgb;
GstGLVideoMixerBlendEquation blend_equation_alpha;
GstGLVideoMixerBlendFunction blend_function_src_rgb;
GstGLVideoMixerBlendFunction blend_function_src_alpha;
GstGLVideoMixerBlendFunction blend_function_dst_rgb;
GstGLVideoMixerBlendFunction blend_function_dst_alpha;
gdouble blend_constant_color_red;
gdouble blend_constant_color_green;
gdouble blend_constant_color_blue;
gdouble blend_constant_color_alpha;
gboolean geometry_change;
GLuint vertex_buffer;
};
@ -559,13 +727,29 @@ enum
PROP_PAD_YPOS,
PROP_PAD_WIDTH,
PROP_PAD_HEIGHT,
PROP_PAD_ALPHA
PROP_PAD_ALPHA,
PROP_PAD_BLEND_EQUATION_RGB,
PROP_PAD_BLEND_EQUATION_ALPHA,
PROP_PAD_BLEND_FUNCTION_SRC_RGB,
PROP_PAD_BLEND_FUNCTION_SRC_ALPHA,
PROP_PAD_BLEND_FUNCTION_DST_RGB,
PROP_PAD_BLEND_FUNCTION_DST_ALPHA,
PROP_PAD_BLEND_FUNCTION_CONSTANT_COLOR_RED,
PROP_PAD_BLEND_FUNCTION_CONSTANT_COLOR_GREEN,
PROP_PAD_BLEND_FUNCTION_CONSTANT_COLOR_BLUE,
PROP_PAD_BLEND_FUNCTION_CONSTANT_COLOR_ALPHA,
};
static void
gst_gl_video_mixer_pad_init (GstGLVideoMixerPad * pad)
{
pad->alpha = 1.0;
pad->alpha = DEFAULT_PAD_ALPHA;
pad->blend_equation_rgb = DEFAULT_PAD_BLEND_EQUATION_RGB;
pad->blend_equation_alpha = DEFAULT_PAD_BLEND_EQUATION_ALPHA;
pad->blend_function_src_rgb = DEFAULT_PAD_BLEND_FUNCTION_SRC_RGB;
pad->blend_function_src_alpha = DEFAULT_PAD_BLEND_FUNCTION_SRC_ALPHA;
pad->blend_function_dst_rgb = DEFAULT_PAD_BLEND_FUNCTION_DST_RGB;
pad->blend_function_dst_alpha = DEFAULT_PAD_BLEND_FUNCTION_DST_ALPHA;
}
static void
@ -596,6 +780,71 @@ gst_gl_video_mixer_pad_class_init (GstGLVideoMixerPadClass * klass)
g_param_spec_double ("alpha", "Alpha", "Alpha of the picture", 0.0, 1.0,
DEFAULT_PAD_ALPHA,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_INPUT_BLEND_EQUATION_RGB,
g_param_spec_enum ("blend-equation-rgb", "Blend Equation RGB",
"Blend Equation for RGB",
GST_TYPE_GL_VIDEO_MIXER_BLEND_EQUATION,
DEFAULT_PAD_BLEND_EQUATION_RGB,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class,
PROP_INPUT_BLEND_EQUATION_ALPHA,
g_param_spec_enum ("blend-equation-alpha", "Blend Equation Alpha",
"Blend Equation for Alpha", GST_TYPE_GL_VIDEO_MIXER_BLEND_EQUATION,
DEFAULT_PAD_BLEND_EQUATION_ALPHA,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class,
PROP_INPUT_BLEND_FUNCTION_SRC_RGB,
g_param_spec_enum ("blend-function-src-rgb", "Blend Function Source RGB",
"Blend Function for Source RGB",
GST_TYPE_GL_VIDEO_MIXER_BLEND_FUNCTION,
DEFAULT_PAD_BLEND_FUNCTION_SRC_RGB,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class,
PROP_INPUT_BLEND_FUNCTION_SRC_ALPHA,
g_param_spec_enum ("blend-function-src-alpha",
"Blend Function Source Alpha", "Blend Function for Source Alpha",
GST_TYPE_GL_VIDEO_MIXER_BLEND_FUNCTION,
DEFAULT_PAD_BLEND_FUNCTION_SRC_ALPHA,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class,
PROP_INPUT_BLEND_FUNCTION_DST_RGB,
g_param_spec_enum ("blend-function-dst-rgb",
"Blend Function Destination RGB",
"Blend Function for Destination RGB",
GST_TYPE_GL_VIDEO_MIXER_BLEND_FUNCTION,
DEFAULT_PAD_BLEND_FUNCTION_DST_RGB,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class,
PROP_INPUT_BLEND_FUNCTION_DST_ALPHA,
g_param_spec_enum ("blend-function-dst-alpha",
"Blend Function Destination Alpha",
"Blend Function for Destiniation Alpha",
GST_TYPE_GL_VIDEO_MIXER_BLEND_FUNCTION,
DEFAULT_PAD_BLEND_FUNCTION_DST_ALPHA,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class,
PROP_PAD_BLEND_FUNCTION_CONSTANT_COLOR_RED,
g_param_spec_double ("blend-constant-color-red",
"Blend Constant Color Red", "Blend Constant Color Red", 0.0, 1.0, 0.0,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class,
PROP_PAD_BLEND_FUNCTION_CONSTANT_COLOR_GREEN,
g_param_spec_double ("blend-constant-color-green",
"Blend Constant Color Green", "Blend Constant Color Green", 0.0, 1.0,
0.0,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class,
PROP_PAD_BLEND_FUNCTION_CONSTANT_COLOR_BLUE,
g_param_spec_double ("blend-constant-color-blue",
"Blend Constant Color Green", "Blend Constant Color Green", 0.0, 1.0,
0.0,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class,
PROP_PAD_BLEND_FUNCTION_CONSTANT_COLOR_ALPHA,
g_param_spec_double ("blend-constant-color-alpha",
"Blend Constant Color Alpha", "Blend Constant Color Alpha", 0.0, 1.0,
0.0,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
}
static void
@ -620,6 +869,36 @@ gst_gl_video_mixer_pad_get_property (GObject * object, guint prop_id,
case PROP_PAD_ALPHA:
g_value_set_double (value, pad->alpha);
break;
case PROP_PAD_BLEND_EQUATION_RGB:
g_value_set_enum (value, pad->blend_equation_rgb);
break;
case PROP_PAD_BLEND_EQUATION_ALPHA:
g_value_set_enum (value, pad->blend_equation_alpha);
break;
case PROP_PAD_BLEND_FUNCTION_SRC_RGB:
g_value_set_enum (value, pad->blend_function_src_rgb);
break;
case PROP_PAD_BLEND_FUNCTION_SRC_ALPHA:
g_value_set_enum (value, pad->blend_function_src_alpha);
break;
case PROP_PAD_BLEND_FUNCTION_DST_RGB:
g_value_set_enum (value, pad->blend_function_dst_rgb);
break;
case PROP_PAD_BLEND_FUNCTION_DST_ALPHA:
g_value_set_enum (value, pad->blend_function_dst_alpha);
break;
case PROP_PAD_BLEND_FUNCTION_CONSTANT_COLOR_RED:
g_value_set_double (value, pad->blend_constant_color_red);
break;
case PROP_PAD_BLEND_FUNCTION_CONSTANT_COLOR_GREEN:
g_value_set_double (value, pad->blend_constant_color_green);
break;
case PROP_PAD_BLEND_FUNCTION_CONSTANT_COLOR_BLUE:
g_value_set_double (value, pad->blend_constant_color_blue);
break;
case PROP_PAD_BLEND_FUNCTION_CONSTANT_COLOR_ALPHA:
g_value_set_double (value, pad->blend_constant_color_alpha);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
@ -653,6 +932,36 @@ gst_gl_video_mixer_pad_set_property (GObject * object, guint prop_id,
case PROP_PAD_ALPHA:
pad->alpha = g_value_get_double (value);
break;
case PROP_PAD_BLEND_EQUATION_RGB:
pad->blend_equation_rgb = g_value_get_enum (value);
break;
case PROP_PAD_BLEND_EQUATION_ALPHA:
pad->blend_equation_alpha = g_value_get_enum (value);
break;
case PROP_PAD_BLEND_FUNCTION_SRC_RGB:
pad->blend_function_src_rgb = g_value_get_enum (value);
break;
case PROP_PAD_BLEND_FUNCTION_SRC_ALPHA:
pad->blend_function_src_alpha = g_value_get_enum (value);
break;
case PROP_PAD_BLEND_FUNCTION_DST_RGB:
pad->blend_function_dst_rgb = g_value_get_enum (value);
break;
case PROP_PAD_BLEND_FUNCTION_DST_ALPHA:
pad->blend_function_dst_alpha = g_value_get_enum (value);
break;
case PROP_PAD_BLEND_FUNCTION_CONSTANT_COLOR_RED:
pad->blend_constant_color_red = g_value_get_double (value);
break;
case PROP_PAD_BLEND_FUNCTION_CONSTANT_COLOR_GREEN:
pad->blend_constant_color_green = g_value_get_double (value);
break;
case PROP_PAD_BLEND_FUNCTION_CONSTANT_COLOR_BLUE:
pad->blend_constant_color_blue = g_value_get_double (value);
break;
case PROP_PAD_BLEND_FUNCTION_CONSTANT_COLOR_ALPHA:
pad->blend_constant_color_alpha = g_value_get_double (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
@ -1017,6 +1326,123 @@ _draw_background (GstGLVideoMixer * video_mixer)
return TRUE;
}
static guint
_blend_equation_to_gl (GstGLVideoMixerBlendEquation equation)
{
switch (equation) {
case GST_GL_VIDEO_MIXER_BLEND_EQUATION_ADD:
return GL_FUNC_ADD;
case GST_GL_VIDEO_MIXER_BLEND_EQUATION_SUBTRACT:
return GL_FUNC_SUBTRACT;
case GST_GL_VIDEO_MIXER_BLEND_EQUATION_REVERSE_SUBTRACT:
return GL_FUNC_REVERSE_SUBTRACT;
default:
g_assert_not_reached ();
return 0;
}
}
static guint
_blend_function_to_gl (GstGLVideoMixerBlendFunction equation)
{
switch (equation) {
case GST_GL_VIDEO_MIXER_BLEND_FUNCTION_ZERO:
return GL_ZERO;
case GST_GL_VIDEO_MIXER_BLEND_FUNCTION_ONE:
return GL_ONE;
case GST_GL_VIDEO_MIXER_BLEND_FUNCTION_SRC_COLOR:
return GL_SRC_COLOR;
case GST_GL_VIDEO_MIXER_BLEND_FUNCTION_ONE_MINUS_SRC_COLOR:
return GL_ONE_MINUS_SRC_COLOR;
case GST_GL_VIDEO_MIXER_BLEND_FUNCTION_DST_COLOR:
return GL_DST_COLOR;
case GST_GL_VIDEO_MIXER_BLEND_FUNCTION_ONE_MINUS_DST_COLOR:
return GL_ONE_MINUS_DST_COLOR;
case GST_GL_VIDEO_MIXER_BLEND_FUNCTION_SRC_ALPHA:
return GL_SRC_ALPHA;
case GST_GL_VIDEO_MIXER_BLEND_FUNCTION_ONE_MINUS_SRC_ALPHA:
return GL_ONE_MINUS_SRC_ALPHA;
case GST_GL_VIDEO_MIXER_BLEND_FUNCTION_DST_ALPHA:
return GL_DST_ALPHA;
case GST_GL_VIDEO_MIXER_BLEND_FUNCTION_ONE_MINUS_DST_ALPHA:
return GL_ONE_MINUS_DST_ALPHA;
case GST_GL_VIDEO_MIXER_BLEND_FUNCTION_CONSTANT_COLOR:
return GL_CONSTANT_COLOR;
case GST_GL_VIDEO_MIXER_BLEND_FUNCTION_ONE_MINUS_CONSTANT_COLOR:
return GL_ONE_MINUS_CONSTANT_COLOR;
case GST_GL_VIDEO_MIXER_BLEND_FUNCTION_CONSTANT_ALPHA:
return GL_CONSTANT_ALPHA;
case GST_GL_VIDEO_MIXER_BLEND_FUNCTION_ONE_MINUS_CONSTANT_ALPHA:
return GL_ONE_MINUS_CONSTANT_ALPHA;
case GST_GL_VIDEO_MIXER_BLEND_FUNCTION_SRC_ALPHA_SATURATE:
return GL_SRC_ALPHA_SATURATE;
default:
g_assert_not_reached ();
return 0;
}
}
static gboolean
_set_blend_state (GstGLVideoMixer * video_mixer, GstGLVideoMixerPad * mix_pad)
{
const GstGLFuncs *gl = GST_GL_BASE_MIXER (video_mixer)->context->gl_vtable;
gboolean require_separate = FALSE;
guint gl_func_src_rgb, gl_func_src_alpha, gl_func_dst_rgb, gl_func_dst_alpha;
guint gl_equation_rgb, gl_equation_alpha;
require_separate =
mix_pad->blend_equation_rgb != mix_pad->blend_equation_alpha
|| mix_pad->blend_function_src_rgb != mix_pad->blend_function_src_alpha
|| mix_pad->blend_function_dst_rgb != mix_pad->blend_function_dst_alpha;
if (require_separate && (!gl->BlendFuncSeparate
|| !gl->BlendEquationSeparate)) {
GST_ERROR_OBJECT (mix_pad,
"separated blend equations/functions requested however "
"glBlendFuncSeparate or glBlendEquationSeparate not available");
return FALSE;
}
if (mix_pad->blend_function_dst_rgb ==
GST_GL_VIDEO_MIXER_BLEND_FUNCTION_SRC_ALPHA_SATURATE) {
GST_ERROR_OBJECT (mix_pad,
"Destination RGB blend function cannot be \'SRC_ALPHA_SATURATE\'");
return FALSE;
}
if (mix_pad->blend_function_dst_alpha ==
GST_GL_VIDEO_MIXER_BLEND_FUNCTION_SRC_ALPHA_SATURATE) {
GST_ERROR_OBJECT (mix_pad,
"Destination alpha blend function cannot be \'SRC_ALPHA_SATURATE\'");
return FALSE;
}
gl_equation_rgb = _blend_equation_to_gl (mix_pad->blend_equation_rgb);
gl_equation_alpha = _blend_equation_to_gl (mix_pad->blend_equation_alpha);
gl_func_src_rgb = _blend_function_to_gl (mix_pad->blend_function_src_rgb);
gl_func_src_alpha = _blend_function_to_gl (mix_pad->blend_function_src_alpha);
gl_func_dst_rgb = _blend_function_to_gl (mix_pad->blend_function_dst_rgb);
gl_func_dst_alpha = _blend_function_to_gl (mix_pad->blend_function_dst_alpha);
if (gl->BlendEquationSeparate)
gl->BlendEquationSeparate (gl_equation_rgb, gl_equation_alpha);
else
gl->BlendEquation (gl_equation_rgb);
if (gl->BlendFuncSeparate)
gl->BlendFuncSeparate (gl_func_src_rgb, gl_func_dst_rgb, gl_func_src_alpha,
gl_func_dst_alpha);
else
gl->BlendFunc (gl_func_src_rgb, gl_func_dst_rgb);
gl->BlendColor (mix_pad->blend_constant_color_red,
mix_pad->blend_constant_color_green, mix_pad->blend_constant_color_blue,
mix_pad->blend_constant_color_alpha);
return TRUE;
}
/* opengl scene, params: input texture (not the output mixer->texture) */
static void
gst_gl_video_mixer_callback (gpointer stuff)
@ -1094,6 +1520,11 @@ gst_gl_video_mixer_callback (gpointer stuff)
continue;
}
if (!_set_blend_state (video_mixer, pad)) {
GST_FIXME_OBJECT (pad, "skipping due to incorrect blend parameters");
continue;
}
in_tex = frame->texture;
_init_vbo_indices (video_mixer);
@ -1135,9 +1566,6 @@ gst_gl_video_mixer_callback (gpointer stuff)
}
gl->BindBuffer (GL_ELEMENT_ARRAY_BUFFER, video_mixer->vbo_indices);
gl->BlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
gl->BlendEquation (GL_FUNC_ADD);
gl->ActiveTexture (GL_TEXTURE0);
gl->BindTexture (GL_TEXTURE_2D, in_tex);
gst_gl_shader_set_uniform_1i (video_mixer->shader, "texture", 0);

60
ext/gl/gstglvideomixer.h
View file

@ -53,6 +53,66 @@ typedef enum
}
GstGLVideoMixerBackground;
/**
* GstGLVideoMixerBlendEquation:
* @GST_GL_VIDEO_MIXER_BLEND_EQUATION_ADD: Add the two results.
* @GST_GL_VIDEO_MIXER_BLEND_EQUATION_SUBTRACT: Subtract component-wise the destination from the source (S - D).
* @GST_GL_VIDEO_MIXER_BLEND_EQUATION_REVERSE_SUBTRACT: Subtract component-wise the source from the destination (D - S).
*
* The blending equation to use. See the opengl specificition for
* glBlendEquationSeparate
*/
typedef enum
{
GST_GL_VIDEO_MIXER_BLEND_EQUATION_ADD,
GST_GL_VIDEO_MIXER_BLEND_EQUATION_SUBTRACT,
GST_GL_VIDEO_MIXER_BLEND_EQUATION_REVERSE_SUBTRACT,
}
GstGLVideoMixerBlendEquation;
/**
* GstGLVideoMixerBlendFunction:
* @GST_GL_VIDEO_MIXER_BLEND_FUNCTION_ZERO: All components are zero
* @GST_GL_VIDEO_MIXER_BLEND_FUNCTION_ONE: All components are one
* @GST_GL_VIDEO_MIXER_BLEND_FUNCTION_SRC_COLOR: Use the source color/alpha
* @GST_GL_VIDEO_MIXER_BLEND_FUNCTION_ONE_MINUS_SRC_COLOR: One minus the source color/alpha
* @GST_GL_VIDEO_MIXER_BLEND_FUNCTION_DST_COLOR: Use the destination color/alpha
* @GST_GL_VIDEO_MIXER_BLEND_FUNCTION_ONE_MINUS_DST_COLOR: One minus the destination color/alpha
* @GST_GL_VIDEO_MIXER_BLEND_FUNCTION_SRC_ALPHA: All components are the source alpha
* @GST_GL_VIDEO_MIXER_BLEND_FUNCTION_ONE_MINUS_SRC_ALPHA: All components are one minus the source alpha
* @GST_GL_VIDEO_MIXER_BLEND_FUNCTION_DST_ALPHA: All components are the destination alpha
* @GST_GL_VIDEO_MIXER_BLEND_FUNCTION_ONE_MINUS_DST_ALPHA: All components are one minus the destination alpha
* @GST_GL_VIDEO_MIXER_BLEND_FUNCTION_CONSTANT_COLOR: Use the constant color/alpha
* @GST_GL_VIDEO_MIXER_BLEND_FUNCTION_ONE_MINUS_CONSTANT_COLOR: Use one minus the constant color/alpha
* @GST_GL_VIDEO_MIXER_BLEND_FUNCTION_CONSTANT_ALPHA: All components are the constant alpha
* @GST_GL_VIDEO_MIXER_BLEND_FUNCTION_ONE_MINUS_CONSTANT_COLOR: All components are one minus the constant alpha
* @GST_GL_VIDEO_MIXER_BLEND_FUNCTION_SRC_ALPHA_SATURATE: All color components
* are the minimum of source alpha and one minus the destination alpha.
* Alpha is equal to one.
*
* The blending function to use. See the opengl specificition for
* glBlendFuncSeparate
*/
typedef enum
{
GST_GL_VIDEO_MIXER_BLEND_FUNCTION_ZERO,
GST_GL_VIDEO_MIXER_BLEND_FUNCTION_ONE,
GST_GL_VIDEO_MIXER_BLEND_FUNCTION_SRC_COLOR,
GST_GL_VIDEO_MIXER_BLEND_FUNCTION_ONE_MINUS_SRC_COLOR,
GST_GL_VIDEO_MIXER_BLEND_FUNCTION_DST_COLOR,
GST_GL_VIDEO_MIXER_BLEND_FUNCTION_ONE_MINUS_DST_COLOR,
GST_GL_VIDEO_MIXER_BLEND_FUNCTION_SRC_ALPHA,
GST_GL_VIDEO_MIXER_BLEND_FUNCTION_ONE_MINUS_SRC_ALPHA,
GST_GL_VIDEO_MIXER_BLEND_FUNCTION_DST_ALPHA,
GST_GL_VIDEO_MIXER_BLEND_FUNCTION_ONE_MINUS_DST_ALPHA,
GST_GL_VIDEO_MIXER_BLEND_FUNCTION_CONSTANT_COLOR,
GST_GL_VIDEO_MIXER_BLEND_FUNCTION_ONE_MINUS_CONSTANT_COLOR,
GST_GL_VIDEO_MIXER_BLEND_FUNCTION_CONSTANT_ALPHA,
GST_GL_VIDEO_MIXER_BLEND_FUNCTION_ONE_MINUS_CONSTANT_ALPHA,
GST_GL_VIDEO_MIXER_BLEND_FUNCTION_SRC_ALPHA_SATURATE,
}
GstGLVideoMixerBlendFunction;
struct _GstGLVideoMixer
{
GstGLMixer mixer;