forked from len0rd/rockbox
Cube.rock: converted to binary fixed-point arithmetic allowing for some more optimisation, and added proper aspect handling of LCDs with non-square pixels (all archos SH targets).
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@7126 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Jens Arnold
parent
d191756286
commit
426df39c4c
1 changed files with 66 additions and 62 deletions
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@ -9,6 +9,7 @@
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*
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* Copyright (C) 2002 Damien Teney
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* modified to use int instead of float math by Andreas Zwirtes
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* binary fixed point format and LCD aspect handling by Jens Arnold
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*
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* All files in this archive are subject to the GNU General Public License.
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* See the file COPYING in the source tree root for full license agreement.
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@ -90,37 +91,35 @@ static int nb_points = 8;
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#define DIST (10*LCD_HEIGHT/16)
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static int x_off = LCD_WIDTH/2;
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static int y_off = LCD_HEIGHT/2;
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#if CONFIG_LCD == LCD_SSD1815
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#define ASPECT 320 /* = 1.25 (fixed point 24.8) */
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#else
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#define ASPECT 256 /* = 1.00 */
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#endif
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#else /* !LCD_BITMAP */
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#define MYLCD(fn) pgfx_ ## fn
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#define DIST 9
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static int x_off = 10;
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static int y_off = 7;
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#endif
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#define ASPECT 300 /* = 1.175 */
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#endif /* !LCD_BITMAP */
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static int z_off = 600;
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/* Precalculated sine and cosine * 10000 (four digit fixed point math) */
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static int sin_table[91] =
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static long z_off = 600;
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/* Precalculated sine and cosine * 16384 (fixed point 18.14) */
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static short sin_table[91] =
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{
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0, 174, 348, 523, 697,
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871,1045,1218,1391,1564,
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1736,1908,2079,2249,2419,
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2588,2756,2923,3090,3255,
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3420,3583,3746,3907,4067,
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4226,4383,4539,4694,4848,
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5000,5150,5299,5446,5591,
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5735,5877,6018,6156,6293,
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6427,6560,6691,6819,6946,
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7071,7193,7313,7431,7547,
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7660,7771,7880,7986,8090,
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8191,8290,8386,8480,8571,
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8660,8746,8829,8910,8987,
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9063,9135,9205,9271,9335,
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9396,9455,9510,9563,9612,
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9659,9702,9743,9781,9816,
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9848,9876,9902,9925,9945,
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9961,9975,9986,9993,9998,
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10000
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0, 285, 571, 857, 1142, 1427, 1712, 1996, 2280, 2563,
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2845, 3126, 3406, 3685, 3963, 4240, 4516, 4790, 5062, 5334,
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5603, 5871, 6137, 6401, 6663, 6924, 7182, 7438, 7691, 7943,
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8191, 8438, 8682, 8923, 9161, 9397, 9630, 9860, 10086, 10310,
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10531, 10748, 10963, 11173, 11381, 11585, 11785, 11982, 12175, 12365,
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12550, 12732, 12910, 13084, 13254, 13420, 13582, 13740, 13894, 14043,
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14188, 14329, 14466, 14598, 14725, 14848, 14967, 15081, 15190, 15295,
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15395, 15491, 15582, 15668, 15749, 15825, 15897, 15964, 16025, 16082,
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16135, 16182, 16224, 16261, 16294, 16321, 16344, 16361, 16374, 16381,
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16384
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};
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static struct plugin_api* rb;
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@ -146,12 +145,12 @@ static long sin(int val)
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if (val < 271)
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{
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/* phase 181-270 degree */
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return (-1L)*(long)sin_table[val-180];
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return -(long)sin_table[val-180];
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}
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else
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{
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/* phase 270-359 degree */
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return (-1L)*(long)sin_table[360-val];
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return -(long)sin_table[360-val];
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}
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}
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return 0;
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@ -170,7 +169,7 @@ static long cos(int val)
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else
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{
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/* phase 91-180 degree */
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return (-1L)*(long)sin_table[val-90];
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return -(long)sin_table[val-90];
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}
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}
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else
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@ -178,7 +177,7 @@ static long cos(int val)
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if (val < 271)
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{
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/* phase 181-270 degree */
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return (-1L)*(long)sin_table[270-val];
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return -(long)sin_table[270-val];
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}
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else
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{
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@ -193,9 +192,9 @@ static long cos(int val)
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static void cube_rotate(int xa, int ya, int za)
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{
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int i;
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/* Just to prevent unnecessary lookups */
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long sxa, cxa, sya, cya, sza, cza;
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sxa = sin(xa);
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cxa = cos(xa);
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sya = sin(ya);
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@ -204,17 +203,17 @@ static void cube_rotate(int xa, int ya, int za)
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cza = cos(za);
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/* calculate overall translation matrix */
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matrice[0][0] = cza*cya/10000L;
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matrice[1][0] = sza*cya/10000L;
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matrice[0][0] = (cza * cya) >> 14;
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matrice[1][0] = (sza * cya) >> 14;
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matrice[2][0] = -sya;
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matrice[0][1] = cza*sya/10000L*sxa/10000L - sza*cxa/10000L;
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matrice[1][1] = sza*sya/10000L*sxa/10000L + cxa*cza/10000L;
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matrice[2][1] = sxa*cya/10000L;
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matrice[0][1] = (((cza * sya) >> 14) * sxa - sza * cxa) >> 14;
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matrice[1][1] = (((sza * sya) >> 14) * sxa + cxa * cza) >> 14;
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matrice[2][1] = (sxa * cya) >> 14;
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matrice[0][2] = cza*sya/10000L*cxa/10000L + sza*sxa/10000L;
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matrice[1][2] = sza*sya/10000L*cxa/10000L - cza*sxa/10000L;
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matrice[2][2] = cxa*cya/10000L;
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matrice[0][2] = (((cza * sya) >> 14) * cxa + sza * sxa) >> 14;
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matrice[1][2] = (((sza * sya) >> 14) * cxa - cza * sxa) >> 14;
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matrice[2][2] = (cxa * cya) >> 14;
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/* apply translation matrix to all points */
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for (i = 0; i < nb_points; i++)
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@ -237,10 +236,15 @@ static void cube_viewport(void)
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/* Do viewport transformation for all points */
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for (i = 0; i < nb_points; i++)
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{
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point2D[i].x=(((point3D[i].x)<<8)/10000L)/
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(point3D[i].z/10000L+z_off)+x_off;
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point2D[i].y=(((point3D[i].y)<<8)/10000L)/
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(point3D[i].z/10000L+z_off)+y_off;
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#if ASPECT != 256
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point2D[i].x = (point3D[i].x * ASPECT) / (point3D[i].z + (z_off << 14))
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+ x_off;
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#else
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point2D[i].x = (point3D[i].x << 8) / (point3D[i].z + (z_off << 14))
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+ x_off;
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#endif
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point2D[i].y = (point3D[i].y << 8) / (point3D[i].z + (z_off << 14))
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+ y_off;
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}
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}
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