mirror of
https://github.com/Rafostar/clapper.git
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2e776ddf7b
This significantly improves performance on mobile devices by removing the texture copy from an OES texture to 2D texture.
104 lines
2.9 KiB
C
104 lines
2.9 KiB
C
/*
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* GStreamer
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* Copyright (C) 2015 Matthew Waters <matthew@centricular.com>
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* Copyright (C) 2015 Thibault Saunier <tsaunier@gnome.org>
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* Copyright (C) 2021 Rafał Dzięgiel <rafostar.github@gmail.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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/* FIXME: remove these once their headers are public in gstreamer:
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* https://gitlab.freedesktop.org/gstreamer/gst-plugins-base/-/merge_requests/804
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*/
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#include "gstclapperglutils.h"
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static const gfloat identity_matrix[] = {
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1.0, 0.0, 0.0, 0.0,
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0.0, 1.0, 0.0, 0.0,
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0.0, 0.0, 1.0, 0.0,
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0.0, 0.0, 0.0, 1.0,
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};
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static const gfloat from_ndc_matrix[] = {
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0.5, 0.0, 0.0, 0.0,
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0.0, 0.5, 0.0, 0.0,
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0.0, 0.0, 0.5, 0.0,
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0.5, 0.5, 0.5, 1.0,
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};
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static const gfloat to_ndc_matrix[] = {
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2.0, 0.0, 0.0, 0.0,
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0.0, 2.0, 0.0, 0.0,
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0.0, 0.0, 2.0, 0.0,
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-1.0, -1.0, -1.0, 1.0,
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};
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/* multiplies two 4x4 matrices, @a X @b, and stores the result in @result
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* https://en.wikipedia.org/wiki/Matrix_multiplication
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*/
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static void
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gst_gl_multiply_matrix4 (const gfloat * a, const gfloat * b, gfloat * result)
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{
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int i, j, k;
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gfloat tmp[16] = { 0.0f };
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if (!a || !b || !result)
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return;
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for (i = 0; i < 4; i++) { /* column */
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for (j = 0; j < 4; j++) { /* row */
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for (k = 0; k < 4; k++) {
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tmp[j + (i * 4)] += a[k + (i * 4)] * b[j + (k * 4)];
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}
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}
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}
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for (i = 0; i < 16; i++)
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result[i] = tmp[i];
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}
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/*
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* gst_clapper_gl_get_affine_transformation_meta_as_ndc:
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* @meta: (nullable): a #GstVideoAffineTransformationMeta
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* @matrix: (out): result of the 4x4 matrix
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*
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* Retrieves the stored 4x4 affine transformation matrix stored in @meta in
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* NDC coordinates. if @meta is NULL, an identity matrix is returned.
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*
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* NDC is a left-handed coordinate system
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* - x - [-1, 1] - +ve X moves right
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* - y - [-1, 1] - +ve Y moves up
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* - z - [-1, 1] - +ve Z moves into
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*/
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void
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gst_clapper_gl_get_affine_transformation_meta_as_ndc (GstVideoAffineTransformationMeta *
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meta, gfloat * matrix)
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{
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if (!meta) {
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int i;
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for (i = 0; i < 16; i++) {
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matrix[i] = identity_matrix[i];
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}
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} else {
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float tmp[16];
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/* change of basis multiplications */
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gst_gl_multiply_matrix4 (from_ndc_matrix, meta->matrix, tmp);
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gst_gl_multiply_matrix4 (tmp, to_ndc_matrix, matrix);
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}
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}
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