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gl/colorconvert: preserve alpha in AYUV <-> RGBA conversions

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https://bugzilla.gnome.org/show_bug.cgi?id=729743
This commit is contained in:
Matthew Waters 2014-05-09 22:22:43 +10:00 committed by Tim-Philipp Müller
parent 977c326c59
commit f213321083
1 changed files with 27 additions and 10 deletions
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37
gst-libs/gst/gl/gstglcolorconvert.c
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@ -175,13 +175,13 @@ static const char frag_AYUV_to_RGB[] =
YUV_TO_RGB_COEFFICIENTS
"void main(void) {\n"
" float r,g,b,a;\n"
" vec3 yuv;\n"
" yuv = texture2D(tex,v_texcoord * tex_scale0).gba;\n"
" yuv += offset;\n"
" r = dot(yuv, coeff1);\n"
" g = dot(yuv, coeff2);\n"
" b = dot(yuv, coeff3);\n"
" a = 1.0;\n"
" vec4 texel;\n"
" texel = texture2D(tex, v_texcoord * tex_scale0);\n"
" texel.gba += offset;\n"
" r = dot(texel.gba, coeff1);\n"
" g = dot(texel.gba, coeff2);\n"
" b = dot(texel.gba, coeff3);\n"
" a = texel.a;\n"
" gl_FragColor=vec4(%c,%c,%c,%c);\n"
"}";
@ -194,7 +194,7 @@ static const gchar frag_RGB_to_AYUV[] =
RGB_TO_YUV_COEFFICIENTS
"void main(void) {\n"
" vec4 texel;\n"
" float y, u, v;\n"
" float y, u, v, a;\n"
" texel = texture2D(tex, v_texcoord).%c%c%c%c;\n"
" y = dot(texel.rgb, coeff1);\n"
" u = dot(texel.rgb, coeff2);\n"
@ -202,7 +202,8 @@ static const gchar frag_RGB_to_AYUV[] =
" y += offset.x;\n"
" u += offset.y;\n"
" v += offset.z;\n"
" gl_FragColor = vec4(1.0,y,u,v);\n"
" a = %s;\n"
" gl_FragColor = vec4(a,y,u,v);\n"
"}\n";
/** YUV to RGB conversion */
@ -595,6 +596,20 @@ _gst_gl_color_convert_perform_unlocked (GstGLColorConvert * convert,
return TRUE;
}
static inline gboolean
_is_RGBx (GstVideoFormat v_format)
{
switch (v_format) {
case GST_VIDEO_FORMAT_RGBx:
case GST_VIDEO_FORMAT_xRGB:
case GST_VIDEO_FORMAT_BGRx:
case GST_VIDEO_FORMAT_xBGR:
return TRUE;
default:
return FALSE;
}
}
static inline gchar
_index_to_shader_swizzle (int idx)
{
@ -804,6 +819,7 @@ _RGB_to_YUV (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->frag_prog = NULL;
info->in_n_textures = 1;
@ -819,8 +835,9 @@ _RGB_to_YUV (GstGLColorConvert * convert)
switch (GST_VIDEO_INFO_FORMAT (&convert->out_info)) {
case GST_VIDEO_FORMAT_AYUV:
alpha = _is_RGBx (in_format) ? "1.0" : "texel.a";
info->frag_prog = g_strdup_printf (frag_RGB_to_AYUV, pixel_order[0],
pixel_order[1], pixel_order[2], pixel_order[3]);
pixel_order[1], pixel_order[2], pixel_order[3], alpha);
info->out_n_textures = 1;
break;
case GST_VIDEO_FORMAT_I420: