c35335aad8
The intention was for these files to be licensed identically to the other files in cogl, so fix this. Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1690>
285 lines
8.9 KiB
C
285 lines
8.9 KiB
C
/* cogl-graphene.c
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*
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* Copyright 2020 Georges Basile Stavracas Neto <georges.stavracas@gmail.com>
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use, copy,
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* modify, merge, publish, distribute, sublicense, and/or sell copies
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* of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial 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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* SPDX-License-Identifier: MIT
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*
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*/
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#include "cogl/cogl-graphene.h"
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typedef struct _Point2f
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{
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float x;
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float y;
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} Point2f;
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typedef struct _Point3f
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{
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float x;
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float y;
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float z;
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} Point3f;
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typedef struct _Point4f
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{
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float x;
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float y;
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float z;
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float w;
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} Point4f;
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static void
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init_matrix_rows (const graphene_matrix_t *matrix,
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unsigned int n_rows,
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graphene_vec4_t *rows)
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{
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graphene_matrix_t m;
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unsigned int i;
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graphene_matrix_transpose (matrix, &m);
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for (i = 0; i < n_rows; i++)
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graphene_matrix_get_row (&m, i, &rows[i]);
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}
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static void
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transform_points_f2 (const graphene_matrix_t *matrix,
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size_t stride_in,
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const void *points_in,
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size_t stride_out,
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void *points_out,
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int n_points)
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{
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graphene_vec4_t rows[3];
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int i;
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init_matrix_rows (matrix, G_N_ELEMENTS (rows), rows);
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for (i = 0; i < n_points; i++)
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{
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Point2f p = *(Point2f *)((uint8_t *)points_in + i * stride_in);
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Point3f *o = (Point3f *)((uint8_t *)points_out + i * stride_out);
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graphene_vec4_t point;
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graphene_vec4_init (&point, p.x, p.y, 0.f, 1.f);
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o->x = graphene_vec4_dot (&rows[0], &point);
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o->y = graphene_vec4_dot (&rows[1], &point);
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o->z = graphene_vec4_dot (&rows[2], &point);
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}
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}
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static void
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project_points_f2 (const graphene_matrix_t *matrix,
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size_t stride_in,
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const void *points_in,
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size_t stride_out,
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void *points_out,
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int n_points)
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{
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graphene_vec4_t rows[4];
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int i;
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init_matrix_rows (matrix, G_N_ELEMENTS (rows), rows);
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for (i = 0; i < n_points; i++)
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{
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Point2f p = *(Point2f *)((uint8_t *)points_in + i * stride_in);
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Point4f *o = (Point4f *)((uint8_t *)points_out + i * stride_out);
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graphene_vec4_t point;
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graphene_vec4_init (&point, p.x, p.y, 0.f, 1.f);
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o->x = graphene_vec4_dot (&rows[0], &point);
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o->y = graphene_vec4_dot (&rows[1], &point);
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o->z = graphene_vec4_dot (&rows[2], &point);
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o->w = graphene_vec4_dot (&rows[3], &point);
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}
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}
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static void
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transform_points_f3 (const graphene_matrix_t *matrix,
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size_t stride_in,
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const void *points_in,
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size_t stride_out,
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void *points_out,
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int n_points)
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{
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graphene_vec4_t rows[3];
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int i;
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init_matrix_rows (matrix, G_N_ELEMENTS (rows), rows);
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for (i = 0; i < n_points; i++)
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{
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Point3f p = *(Point3f *)((uint8_t *)points_in + i * stride_in);
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Point3f *o = (Point3f *)((uint8_t *)points_out + i * stride_out);
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graphene_vec4_t point;
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graphene_vec4_init (&point, p.x, p.y, p.z, 1.f);
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o->x = graphene_vec4_dot (&rows[0], &point);
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o->y = graphene_vec4_dot (&rows[1], &point);
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o->z = graphene_vec4_dot (&rows[2], &point);
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}
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}
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static void
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project_points_f3 (const graphene_matrix_t *matrix,
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size_t stride_in,
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const void *points_in,
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size_t stride_out,
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void *points_out,
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int n_points)
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{
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graphene_vec4_t rows[4];
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int i;
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init_matrix_rows (matrix, G_N_ELEMENTS (rows), rows);
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for (i = 0; i < n_points; i++)
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{
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Point3f p = *(Point3f *)((uint8_t *)points_in + i * stride_in);
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Point4f *o = (Point4f *)((uint8_t *)points_out + i * stride_out);
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graphene_vec4_t point;
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graphene_vec4_init (&point, p.x, p.y, p.z, 1.f);
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o->x = graphene_vec4_dot (&rows[0], &point);
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o->y = graphene_vec4_dot (&rows[1], &point);
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o->z = graphene_vec4_dot (&rows[2], &point);
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o->w = graphene_vec4_dot (&rows[3], &point);
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}
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}
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static void
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project_points_f4 (const graphene_matrix_t *matrix,
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size_t stride_in,
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const void *points_in,
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size_t stride_out,
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void *points_out,
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int n_points)
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{
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graphene_vec4_t rows[4];
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int i;
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init_matrix_rows (matrix, G_N_ELEMENTS (rows), rows);
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for (i = 0; i < n_points; i++)
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{
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Point4f p = *(Point4f *)((uint8_t *)points_in + i * stride_in);
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Point4f *o = (Point4f *)((uint8_t *)points_out + i * stride_out);
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graphene_vec4_t point;
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graphene_vec4_init (&point, p.x, p.y, p.z, p.w);
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o->x = graphene_vec4_dot (&rows[0], &point);
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o->y = graphene_vec4_dot (&rows[1], &point);
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o->z = graphene_vec4_dot (&rows[2], &point);
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o->w = graphene_vec4_dot (&rows[3], &point);
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}
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}
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void
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cogl_graphene_matrix_project_point (const graphene_matrix_t *matrix,
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float *x,
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float *y,
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float *z,
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float *w)
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{
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graphene_vec4_t p;
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graphene_vec4_init (&p, *x, *y, *z, *w);
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graphene_matrix_transform_vec4 (matrix, &p, &p);
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*x = graphene_vec4_get_x (&p);
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*y = graphene_vec4_get_y (&p);
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*z = graphene_vec4_get_z (&p);
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*w = graphene_vec4_get_w (&p);
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}
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void
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cogl_graphene_matrix_transform_points (const graphene_matrix_t *matrix,
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int n_components,
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size_t stride_in,
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const void *points_in,
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size_t stride_out,
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void *points_out,
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int n_points)
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{
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/* The results of transforming always have three components... */
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g_return_if_fail (stride_out >= sizeof (Point3f));
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if (n_components == 2)
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{
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transform_points_f2 (matrix,
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stride_in, points_in,
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stride_out, points_out,
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n_points);
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}
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else
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{
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g_return_if_fail (n_components == 3);
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transform_points_f3 (matrix,
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stride_in, points_in,
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stride_out, points_out,
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n_points);
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}
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}
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void
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cogl_graphene_matrix_project_points (const graphene_matrix_t *matrix,
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int n_components,
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size_t stride_in,
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const void *points_in,
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size_t stride_out,
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void *points_out,
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int n_points)
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{
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if (n_components == 2)
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{
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project_points_f2 (matrix,
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stride_in, points_in,
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stride_out, points_out,
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n_points);
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}
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else if (n_components == 3)
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{
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project_points_f3 (matrix,
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stride_in, points_in,
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stride_out, points_out,
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n_points);
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}
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else
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{
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g_return_if_fail (n_components == 4);
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project_points_f4 (matrix,
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stride_in, points_in,
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stride_out, points_out,
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n_points);
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}
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}
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