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gl: use correct blend functions for unpremultiplied alpha

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Fallback to the closest but incorrect values we had before if we can't
do this correctly.
This commit is contained in:
Matthew Waters 2018-10-04 23:43:19 +10:00
parent d63add22d2
commit 779d028f27
2 changed files with 13 additions and 2 deletions
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9
ext/gl/gstglimagesink.c
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@ -2237,7 +2237,14 @@ gst_glimage_sink_on_draw (GstGLImageSink * gl_sink)
if (gl_sink->ignore_alpha) {
gl->BlendColor (0.0, 0.0, 0.0, alpha);
gl->BlendFunc (GL_SRC_ALPHA, GL_CONSTANT_COLOR);
if (gl->BlendFuncSeparate) {
gl->BlendFuncSeparate (GL_SRC_ALPHA, GL_CONSTANT_COLOR, GL_ONE,
GL_ONE_MINUS_SRC_ALPHA);
} else {
/* we don't have separate blend modes, perform something close to
* correct instead */
gl->BlendFunc (GL_SRC_ALPHA, GL_CONSTANT_COLOR);
}
gl->BlendEquation (GL_FUNC_ADD);
gl->Enable (GL_BLEND);
}

6
ext/gl/gstgloverlay.c
View file

@ -530,7 +530,11 @@ gst_gl_overlay_callback (GstGLFilter * filter, GstGLMemory * in_tex,
gst_gl_shader_set_uniform_1f (overlay->shader, "alpha", overlay->alpha);
gl->Enable (GL_BLEND);
gl->BlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
if (gl->BlendFuncSeparate)
gl->BlendFuncSeparate (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA, GL_ONE,
GL_ONE_MINUS_SRC_ALPHA);
else
gl->BlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
gl->BlendEquation (GL_FUNC_ADD);
gl->DrawElements (GL_TRIANGLES, 6, GL_UNSIGNED_SHORT, 0);