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gl/convert: clobber alpha channel when needed

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Needed in the conversion from padded RGB formats to formats with an
alpha channel.  e.g. BGRx -> ABGR, etc

https://bugzilla.gnome.org/show_bug.cgi?id=729742
This commit is contained in:
Matthew Waters 2014-05-12 21:56:06 +10:00
parent a4f0fbe4c3
commit bd3e600710
1 changed files with 11 additions and 3 deletions
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14
gst-libs/gst/gl/gstglcolorconvert.c
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@ -133,6 +133,7 @@ static const gchar frag_REORDER[] =
"void main(void)\n"
"{\n"
" vec4 t = texture2D(tex, v_texcoord * tex_scale0);\n"
" %s;\n" /* clobber alpha channel? */
" gl_FragColor = vec4(t.%c, t.%c, t.%c, t.%c);\n"
"}";
@ -698,10 +699,13 @@ _RGB_to_RGB (GstGLColorConvert * convert)
GstVideoFormat out_format = GST_VIDEO_INFO_FORMAT (&convert->out_info);
const gchar *out_format_str = gst_video_format_to_string (out_format);
gchar *pixel_order = _RGB_pixel_order (in_format_str, out_format_str);
const gchar *alpha = "";
info->in_n_textures = 1;
info->out_n_textures = 1;
info->frag_prog = g_strdup_printf (frag_REORDER, pixel_order[0],
if (_is_RGBx (in_format))
alpha = "t.a = 1.0";
info->frag_prog = g_strdup_printf (frag_REORDER, alpha, pixel_order[0],
pixel_order[1], pixel_order[2], pixel_order[3]);
info->shader_tex_names[0] = "tex";
info->shader_scaling[0][0] = 1.0f;
@ -892,6 +896,7 @@ _RGB_to_GRAY (GstGLColorConvert * convert)
GstVideoFormat in_format = GST_VIDEO_INFO_FORMAT (&convert->in_info);
const gchar *in_format_str = gst_video_format_to_string (in_format);
gchar *pixel_order = _RGB_pixel_order (in_format_str, "rgba");
const gchar *alpha = "";
info->in_n_textures = 1;
info->out_n_textures = 1;
@ -903,9 +908,12 @@ _RGB_to_GRAY (GstGLColorConvert * convert)
info->shader_scaling[2][0] = 1.0f;
info->shader_scaling[2][1] = 1.0f;
if (_is_RGBx (in_format))
alpha = "t.a = 1.0";
switch (GST_VIDEO_INFO_FORMAT (&convert->out_info)) {
case GST_VIDEO_FORMAT_GRAY8:
info->frag_prog = g_strdup_printf (frag_REORDER, pixel_order[0],
info->frag_prog = g_strdup_printf (frag_REORDER, alpha, pixel_order[0],
pixel_order[0], pixel_order[0], pixel_order[3]);
break;
default:
@ -933,7 +941,7 @@ _GRAY_to_RGB (GstGLColorConvert * convert)
switch (GST_VIDEO_INFO_FORMAT (&convert->in_info)) {
case GST_VIDEO_FORMAT_GRAY8:
info->frag_prog = g_strdup_printf (frag_REORDER, pixel_order[0],
info->frag_prog = g_strdup_printf (frag_REORDER, "", pixel_order[0],
pixel_order[1], pixel_order[2], pixel_order[3]);
break;
case GST_VIDEO_FORMAT_GRAY16_LE: