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fixed bug in fovy angle degree -> rad conversion, added glMultMatrixx() code

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This commit is contained in:
Tomas Frydrych 2007-03-29 11:30:30 +00:00
parent d1d746eab1
commit 3944495569
2 changed files with 33 additions and 10 deletions
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9
ChangeLog
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@ -1,3 +1,10 @@
2007-03-29 Tomas Frydrych <tf@openedhand.com>
* clutter/clutter-stage.c:
(perspective): fixed degree -> rad conversion for fovy angle
(perspectivex): fixed degree -> rad conversion for fovy angle,
added code for gle glMultMatrixx().
2007-03-29 Tomas Frydrych <tf@openedhand.com>
* configure.ac: fixed typo
@ -7,7 +14,7 @@
(clutter_tani): fast implementation of tan()
(clutter_qmulx): improved-precission fixed point multiply
* clutter/clutter-state.c:
* clutter/clutter-stage.c:
(perspectivex): fixed point implementaiton of perspective()
(_clutter_stage_sync_viewport):
(clutter_stage_get_actor_at_pos):

30
clutter/clutter-stage.c
View File

@ -49,6 +49,7 @@
#include <gdk-pixbuf-xlib/gdk-pixbuf-xlib.h>
#define FIXED_PERSPECTIVE
#undef USING_GLES
G_DEFINE_ABSTRACT_TYPE (ClutterStage, clutter_stage, CLUTTER_TYPE_GROUP);
@ -665,7 +666,7 @@ perspective (GLfloat fovy,
{
GLfloat xmin, xmax, ymin, ymax;
ymax = zNear * tan (fovy * M_PI / 180.0);
ymax = zNear * tan (fovy * M_PI / 360.0);
ymin = -ymax;
xmin = ymin * aspect;
xmax = ymax * aspect;
@ -687,7 +688,12 @@ perspectivex (ClutterAngle fovy,
{
ClutterFixed xmax, ymax;
ClutterFixed x, y, c, d;
#ifndef USING_GLES
GLfloat m[16];
#else
GLfixed m[16];
#endif
memset (&m[0], 0, sizeof (m));
@ -700,7 +706,7 @@ perspectivex (ClutterAngle fovy,
* 2) When working with small numbers, we can are loosing significant
* precision, hence we use clutter_qmulx() here, not the fast macro.
*/
ymax = clutter_qmulx (zNear, clutter_tani (fovy));
ymax = clutter_qmulx (zNear, clutter_tani (fovy >> 1));
xmax = clutter_qmulx (ymax, aspect);
x = CFX_DIV (zNear, xmax);
@ -709,14 +715,24 @@ perspectivex (ClutterAngle fovy,
d = CFX_DIV (-(clutter_qmulx (2*zFar, zNear)), (zFar - zNear));
#define M(row,col) m[col*4+row]
#ifndef USING_GLES
M(0,0) = CLUTTER_FIXED_TO_FLOAT (x);
M(1,1) = CLUTTER_FIXED_TO_FLOAT (y);
M(2,2) = CLUTTER_FIXED_TO_FLOAT (c);
M(2,3) = CLUTTER_FIXED_TO_FLOAT (d);
M(3,2) = -1.0F;
#undef M
glMultMatrixf (m);
#else
M(0,0) = x;
M(1,1) = y;
M(2,2) = c;
M(2,3) = d;
M(3,2) = 1 + ~CFX_ONE;
glMultMatrixx (m);
#endif
#undef M
}
#endif
@ -739,9 +755,9 @@ _clutter_stage_sync_viewport (ClutterStage *stage)
glLoadIdentity ();
#ifndef FIXED_PERSPECTIVE
perspective (30.0f, 1.0f, 0.1f, 100.0f);
perspective (60.0f, 1.0f, 0.1f, 100.0f);
#else
perspectivex (85, /* 30 degrees */
perspectivex (171, /* 60 degrees */
CFX_ONE,
CLUTTER_FLOAT_TO_FIXED (0.1),
CLUTTER_FLOAT_TO_FIXED (100.0));
@ -802,9 +818,9 @@ clutter_stage_get_actor_at_pos (ClutterStage *stage,
glScalef (view[2], -view[3], 1.0);
#ifndef FIXED_PERSPECTIVE
perspective (30.0f, 1.0f, 0.1f, 100.0f);
perspective (60.0f, 1.0f, 0.1f, 100.0f);
#else
perspectivex (85, /* 30 degrees */
perspectivex (171, /* 60 degrees */
CFX_ONE,
CLUTTER_FLOAT_TO_FIXED (0.1),
CLUTTER_FLOAT_TO_FIXED (100.0));