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glvideomixer: fix blending with low-alpha sources

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We also need to apply the blend paramaters to the alpha channel otherwise
the output of the blend will appear black at low alpha values (< 0.2).
This commit is contained in:
Matthew Waters 2014-09-26 01:34:54 +10:00
parent e4dd599a55
commit bc399a0403
1 changed files with 2 additions and 3 deletions
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5
ext/gl/gstglvideomixer.c
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@ -649,9 +649,8 @@ gst_gl_video_mixer_callback (gpointer stuff)
gl->EnableVertexAttribArray (attr_position_loc);
gl->EnableVertexAttribArray (attr_texture_loc);
gl->BlendFuncSeparate (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA, GL_ONE,
GL_ZERO);
gl->BlendEquationSeparate (GL_FUNC_ADD, GL_FUNC_ADD);
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);