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This creates the fragment shader state needed for in-shader blending. In-shader blending is always enabled if supported: - GL supports the necessary features, and - the blend-to-output color curve is exactly invertible. The exact inverse is required, because the compositor will do repeated decode-encode cycles per destination pixel, one for each non-opaque source. Roundtrip errors through decode-encode might accumulate otherwise. For now, identity, enumerated, and parametric curves are deemed invertible while LUT is rejected without inspection. Therefore to make use of this feature, outputs need to be configured with a non-LUT type EOTF/TRC. In-shader blending is always enabled, because it should be universally more efficient than the use of a shadow buffer. This feature was originally drafted for Weston by Sebastian Wick. Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.com>
47 lines
1.7 KiB
C
47 lines
1.7 KiB
C
/*
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* Copyright 2025-2026 Collabora, Ltd.
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial
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* portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#ifndef WESTON_COLOR_OPERATIONS_H
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#define WESTON_COLOR_OPERATIONS_H
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#include <libweston/libweston.h>
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#include <libweston/linalg-3.h>
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#include "color.h"
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void
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weston_color_curve_sample(struct weston_compositor *compositor,
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const struct weston_color_curve *curve,
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const struct weston_vec3f *in,
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struct weston_vec3f *out,
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size_t len);
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const struct weston_color_curve *
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weston_color_transform_as_single_curve(const struct weston_color_transform *xform);
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struct weston_color_curve *
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weston_color_curve_create_inverse(const struct weston_color_curve *curve);
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#endif /* WESTON_COLOR_OPERATIONS_H */
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