9130dc1311
Instead of unconditionally combining the modelview and projection
matrices and then iterating each of the vertices to call
cogl_matrix_transform_point for each one in turn we now only combine the
matrices if there are more than 4 vertices (with less than 4 vertices
its less work to transform them separately) and we use the new
cogl_vertex_{transform,project}_points APIs which can hopefully
vectorize the transformations.
Finally the perspective divide and viewport scale is done in a separate
loop at the end and we don't do the spurious perspective divide and
viewport scale for the z component.
151 lines
4.4 KiB
C
151 lines
4.4 KiB
C
/*
|
|
* Clutter.
|
|
*
|
|
* An OpenGL based 'interactive canvas' library.
|
|
*
|
|
* Authored By Matthew Allum <mallum@openedhand.com>
|
|
*
|
|
* Copyright (C) 2006 OpenedHand
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2 of the License, or (at your option) any later version.
|
|
*
|
|
* This library is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
|
|
*
|
|
*
|
|
*/
|
|
|
|
/**
|
|
* SECTION:clutter-util
|
|
* @short_description: Utility functions
|
|
*
|
|
* Various miscellaneous utilility functions.
|
|
*/
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
#include "config.h"
|
|
#endif
|
|
|
|
#include <glib/gi18n-lib.h>
|
|
|
|
#include "clutter-util.h"
|
|
#include "clutter-main.h"
|
|
|
|
/**
|
|
* clutter_util_next_p2:
|
|
* @a: Value to get the next power
|
|
*
|
|
* Calculates the nearest power of two, greater than or equal to @a.
|
|
*
|
|
* Return value: The nearest power of two, greater or equal to @a.
|
|
*
|
|
* Deprecated: 1.2
|
|
*/
|
|
gint
|
|
clutter_util_next_p2 (gint a)
|
|
{
|
|
int rval = 1;
|
|
|
|
while (rval < a)
|
|
rval <<= 1;
|
|
|
|
return rval;
|
|
}
|
|
|
|
/*< private >
|
|
* _clutter_gettext:
|
|
* @str: a string to localize
|
|
*
|
|
* Retrieves the localized version of @str, using the Clutter domain
|
|
*
|
|
* Return value: the translated string
|
|
*/
|
|
G_CONST_RETURN gchar *
|
|
_clutter_gettext (const gchar *str)
|
|
{
|
|
return g_dgettext (GETTEXT_PACKAGE, str);
|
|
}
|
|
|
|
/* Help macros to scale from OpenGL <-1,1> coordinates system to
|
|
* window coordinates ranging [0,window-size]
|
|
*/
|
|
#define MTX_GL_SCALE_X(x,w,v1,v2) ((((((x) / (w)) + 1.0f) / 2.0f) * (v1)) + (v2))
|
|
#define MTX_GL_SCALE_Y(y,w,v1,v2) ((v1) - (((((y) / (w)) + 1.0f) / 2.0f) * (v1)) + (v2))
|
|
#define MTX_GL_SCALE_Z(z,w,v1,v2) (MTX_GL_SCALE_X ((z), (w), (v1), (v2)))
|
|
|
|
typedef struct _ClutterVertex4
|
|
{
|
|
float x;
|
|
float y;
|
|
float z;
|
|
float w;
|
|
} ClutterVertex4;
|
|
|
|
void
|
|
_clutter_util_fully_transform_vertices (const CoglMatrix *modelview,
|
|
const CoglMatrix *projection,
|
|
const float *viewport,
|
|
const ClutterVertex *vertices_in,
|
|
ClutterVertex *vertices_out,
|
|
int n_vertices)
|
|
{
|
|
CoglMatrix modelview_projection;
|
|
ClutterVertex4 *vertices_tmp;
|
|
int i;
|
|
|
|
vertices_tmp = g_alloca (sizeof (ClutterVertex4) * n_vertices);
|
|
|
|
if (n_vertices >= 4)
|
|
{
|
|
/* XXX: we should find a way to cache this per actor */
|
|
cogl_matrix_multiply (&modelview_projection,
|
|
projection,
|
|
modelview);
|
|
cogl_matrix_project_points (&modelview_projection,
|
|
3,
|
|
sizeof (ClutterVertex),
|
|
vertices_in,
|
|
sizeof (ClutterVertex4),
|
|
vertices_tmp,
|
|
n_vertices);
|
|
}
|
|
else
|
|
{
|
|
cogl_matrix_transform_points (modelview,
|
|
3,
|
|
sizeof (ClutterVertex),
|
|
vertices_in,
|
|
sizeof (ClutterVertex4),
|
|
vertices_tmp,
|
|
n_vertices);
|
|
|
|
cogl_matrix_project_points (projection,
|
|
3,
|
|
sizeof (ClutterVertex4),
|
|
vertices_tmp,
|
|
sizeof (ClutterVertex4),
|
|
vertices_tmp,
|
|
n_vertices);
|
|
}
|
|
|
|
for (i = 0; i < n_vertices; i++)
|
|
{
|
|
ClutterVertex4 vertex_tmp = vertices_tmp[i];
|
|
ClutterVertex *vertex_out = &vertices_out[i];
|
|
/* Finally translate from OpenGL coords to window coords */
|
|
vertex_out->x = MTX_GL_SCALE_X (vertex_tmp.x, vertex_tmp.w,
|
|
viewport[2], viewport[0]);
|
|
vertex_out->y = MTX_GL_SCALE_Y (vertex_tmp.y, vertex_tmp.w,
|
|
viewport[3], viewport[1]);
|
|
}
|
|
}
|
|
|