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glvideomixer: fix blending with low-alpha sources
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).
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1 changed files with 2 additions and 3 deletions
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@ -649,9 +649,8 @@ gst_gl_video_mixer_callback (gpointer stuff)
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gl->EnableVertexAttribArray (attr_position_loc);
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gl->EnableVertexAttribArray (attr_texture_loc);
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gl->BlendFuncSeparate (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA, GL_ONE,
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GL_ZERO);
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gl->BlendEquationSeparate (GL_FUNC_ADD, GL_FUNC_ADD);
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gl->BlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
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gl->BlendEquation (GL_FUNC_ADD);
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gl->ActiveTexture (GL_TEXTURE0);
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gl->BindTexture (GL_TEXTURE_2D, in_tex);
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