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ONScripterLabel_effect_trig.cpp
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ONScripterLabel_effect_trig.cpp
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/* -*- C++ -*-
*
* ONScripterLabel_effect_trig.cpp - for ONScripter-EN trig-tables,
* emulation of Takashi Toyama's "whirl.dll" and "trvswave.dll"
* NScripter plugin effects
*
* Copyright (c) 2008-2011 "Uncle" Mion Sonozaki
*
* UncleMion@gmail.com
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>
* or write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "ONScripterLabel.h"
void ONScripterLabel::buildSinTable()
{
if (!sin_table) {
//integer-based trig table, scaled up by TRIG_FACTOR
sin_table = new int[TRIG_TABLE_SIZE];
for (int i=0; i<TRIG_TABLE_SIZE; i++) {
sin_table[i] = (int)(sin((float) i * M_PI * 2 / TRIG_TABLE_SIZE) *
TRIG_FACTOR);
}
}
}
void ONScripterLabel::buildCosTable()
{
if (!cos_table) {
//integer-based trig table, scaled up by TRIG_FACTOR
cos_table = new int[TRIG_TABLE_SIZE];
for (int i=0; i<TRIG_TABLE_SIZE; i++) {
cos_table[i] = (int)(cos((float) i * M_PI * 2 / TRIG_TABLE_SIZE) *
TRIG_FACTOR);
}
}
}
//
// Emulation of Takashi Toyama's "trvswave.dll" NScripter plugin effect
//
void ONScripterLabel::effectTrvswave( char *params, int duration )
{
enum {
//some constants for trvswave
TRVSWAVE_AMPLITUDE = 9,
TRVSWAVE_WVLEN_END = 32,
TRVSWAVE_WVLEN_START = 256
};
SDL_Rect src_rect={0, 0, screen_width, 1};
SDL_Rect dst_rect={0, 0, screen_width, 1};
int ampl, wvlen;
int y_offset = -screen_height / 2;
int width = 256 * effect_counter / duration;
effectBlend( NULL, ALPHA_BLEND_CONST, width, &dirty_rect.bounding_box, NULL, NULL, effect_tmp_surface );
if (effect_counter * 2 < duration) {
ampl = TRVSWAVE_AMPLITUDE * 2 * effect_counter / duration;
wvlen = (Sint16)(1.0/(((1.0/TRVSWAVE_WVLEN_END - 1.0/TRVSWAVE_WVLEN_START) * 2 * effect_counter / duration) + (1.0/TRVSWAVE_WVLEN_START)));
} else {
ampl = TRVSWAVE_AMPLITUDE * 2 * (duration - effect_counter) / duration;
wvlen = (Sint16)(1.0/(((1.0/TRVSWAVE_WVLEN_END - 1.0/TRVSWAVE_WVLEN_START) * 2 * (duration - effect_counter) / duration) + (1.0/TRVSWAVE_WVLEN_START)));
}
SDL_FillRect( accumulation_surface, NULL, SDL_MapRGBA( accumulation_surface->format, 0, 0, 0, 0xff ) );
for (int i=0; i<screen_height; i++) {
int theta = TRIG_TABLE_SIZE * y_offset / wvlen;
while (theta < 0) theta += TRIG_TABLE_SIZE;
theta %= TRIG_TABLE_SIZE;
dst_rect.x = (Sint16)(ampl * sin_table[theta] / TRIG_FACTOR);
//dst_rect.x = (Sint16)(ampl * sin(M_PI * 2.0 * y_offset / wvlen));
SDL_BlitSurface(effect_tmp_surface, &src_rect, accumulation_surface, &dst_rect);
++src_rect.y;
++dst_rect.y;
++y_offset;
}
}
//
// Emulation of Takashi Toyama's "whirl.dll" NScripter plugin effect
//
#define CENTER_X (screen_width/2)
#define CENTER_Y (screen_height/2)
void ONScripterLabel::buildWhirlTable()
{
if (whirl_table) return;
whirl_table = new int[screen_height * screen_width];
int *dst_buffer = whirl_table;
for ( int i=0 ; i<screen_height ; ++i ){
for ( int j=0; j<screen_width ; ++j, ++dst_buffer ){
int x = j - CENTER_X, y = i - CENTER_Y;
// actual x = x + 0.5, actual y = y + 0.5;
// (x+0.5)^2 + (y+0.5)^2 = x^2 + x + 0.25 + y^2 + y + 0.25
*dst_buffer = (int)(sqrt((float)(x * x + x + y * y + y) + 0.5) * 4);
}
}
}
void ONScripterLabel::effectWhirl( char *params, int duration )
{
//#define OMEGA (M_PI / 64)
int direction = (params[0] == 'r') ? -1 : 1;
int t = (effect_counter * (TRIG_TABLE_SIZE/4) / duration) %
TRIG_TABLE_SIZE;
int rad_amp = (sin_table[t] + cos_table[t] - TRIG_FACTOR) *
(TRIG_TABLE_SIZE/2) / TRIG_FACTOR;
int rad_base = ((TRIG_FACTOR - cos_table[t]) *
TRIG_TABLE_SIZE / TRIG_FACTOR) + rad_amp;
//float t = (float) effect_counter * M_PI / (duration * 2);
//float one_minus_cos = 1 - cos(t);
//float rad_amp = M_PI * (sin(t) - one_minus_cos);
//float rad_base = M_PI * 2 * one_minus_cos + rad_amp;
int width = 256 * effect_counter / duration;
effectBlend( NULL, ALPHA_BLEND_CONST, width, &dirty_rect.bounding_box,
NULL, NULL, effect_tmp_surface );
SDL_LockSurface( effect_tmp_surface );
SDL_LockSurface( accumulation_surface );
ONSBuf *src_buffer = (ONSBuf *)effect_tmp_surface->pixels;
ONSBuf *dst_buffer = (ONSBuf *)accumulation_surface->pixels;
int *whirl_buffer = whirl_table;
for ( int i=0 ; i<screen_height ; ++i ){
for ( int j=0 ; j<screen_width ; ++j, ++dst_buffer, ++whirl_buffer ){
int ii=i, jj=j;
// actual x = x + 0.5, actual y = y + 0.5
int x = j - CENTER_X, y = i - CENTER_Y;
//whirl factor
int theta = *whirl_buffer;
while (theta < 0) theta += TRIG_TABLE_SIZE;
theta %= TRIG_TABLE_SIZE;
theta = ((rad_amp * sin_table[theta] / TRIG_FACTOR) + rad_base) *
direction;
//float theta = direction * (rad_base + rad_amp *
// sin(sqrt(x * x + y * y) * OMEGA));
//perform rotation
while (theta < 0) theta += TRIG_TABLE_SIZE;
theta %= TRIG_TABLE_SIZE;
//working on x+0.5, hence (2x+1)/2
jj = (((x + x + 1) * cos_table[theta] -
(y + y + 1) * sin_table[theta])/TRIG_FACTOR - 1)/2 +
CENTER_X;
ii = (((x + x + 1) * sin_table[theta] +
(y + y + 1) * cos_table[theta])/TRIG_FACTOR - 1)/2 +
CENTER_Y;
//jj = (int) (x * cos_theta - y * sin_theta + CENTER_X);
//ii = (int) (x * sin_theta + y * cos_theta + CENTER_Y);
if (jj < 0) jj = 0;
if (jj >= screen_width) jj = screen_width-1;
if (ii < 0) ii = 0;
if (ii >= screen_height) ii = screen_height-1;
// change pixel value!
*dst_buffer = *(src_buffer + screen_width * ii + jj);
}
}
SDL_UnlockSurface( accumulation_surface );
SDL_UnlockSurface( effect_tmp_surface );
}