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gen_img.c
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gen_img.c
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/* ACID WARP (c)Copyright 1992, 1993 by Noah Spurrier
* All Rights reserved. Private Proprietary Source Code by Noah Spurrier
* Ported to Linux by Steven Wills
* Ported to SDL by Boris Gjenero
*/
#ifdef ENABLE_FLOAT
void generate_image_float(int imageFuncNum, UCHAR *buf_graf,
int _xcenter, int _ycenter,
int _width, int _height,
int colors, int pitch, int normalize)
#else
void generate_image(int imageFuncNum, UCHAR *buf_graf,
int xcenter, int ycenter,
int width, int height,
int colors, int pitch)
#endif
{
/* WARNING!!! Major change from long to int.*/
/* ### Changed back to long. Gives lots of warnings. Will fix soon. */
long x1,x2,x3,x4,y1,y2,y3,y4;
#ifndef ENABLE_FLOAT
long /* int */ x, y, dx, dy;
long dist, angle;
long color;
#define _xcenter xcenter
#define _ycenter ycenter
#define _width width
#define _height height
#define _x x
#define _y y
#define _color color
#else /* ENABLE_FLOAT */
long _x, _y;
long _color;
double x, y;
double dx, dy;
double dist, angle;
double color;
double xcenter, ycenter, width, height;
if (normalize) {
xcenter = (double)(_xcenter * 320) / _width;
ycenter = (double)(_ycenter * 200) / _height;
width = (double)320;
height = (double)200;
} else {
xcenter = _xcenter;
ycenter = _ycenter;
width = _width;
height = _height;
}
#endif /* ENABLE_FLOAT */
/* Some general purpose random angles and offsets.
* Not all functions use them.
*/
x1 = RANDOM(40)-20; x2 = RANDOM(40)-20;
x3 = RANDOM(40)-20; x4 = RANDOM(40)-20;
y1 = RANDOM(40)-20; y2 = RANDOM(40)-20;
y3 = RANDOM(40)-20; y4 = RANDOM(40)-20;
for (_y = 0;
_y < _height
#ifdef ENABLE_THREADS
&& !abort_draw
#endif
; ++_y)
{
#ifdef ENABLE_FLOAT
if (normalize) {
y = (double)(_y * 200) / _height;
} else {
y = _y;
}
#endif
for (_x = 0; _x < _width; ++_x)
{
#ifdef ENABLE_FLOAT
if (normalize) {
x = (double)(_x * 320) / _width;
} else {
x = _x;
}
#endif
dx = x - xcenter;
/* dy may be altered below, so calculate here */
dy = y - ycenter;
dist = lut_dist (dx, dy);
angle = lut_angle (dx, dy);
/* select function. Could be made a separate function, but since
this function is evaluated over a large iteration of values I am
afraid that it might slow things down even more to have a
separate function. */
switch (imageFuncNum)
{
/* case -1: Eight Arm Star -- produces weird discontinuity
color = dist+ lut_sin(angle * (200 - dist)) / 32;
break;
*/
case 0: /* Rays plus 2D Waves */
color = angle + lut_sin (dist * 10) / 64 +
lut_cos (x * ANGLE_UNIT / width * 2) / 32 +
lut_cos (y * ANGLE_UNIT / height * 2) / 32;
break;
case 1: /* Rays plus 2D Waves */
color = angle + lut_sin (dist * 10) / 16 +
lut_cos (x * ANGLE_UNIT / width * 2) / 8 +
lut_cos (y * ANGLE_UNIT / height * 2) / 8;
break;
case 2:
color = lut_sin (lut_dist(dx + x1, dy + y1) * 4) / 32 +
lut_sin (lut_dist(dx + x2, dy + y2) * 8) / 32 +
lut_sin (lut_dist(dx + x3, dy + y3) * 16) / 32 +
lut_sin (lut_dist(dx + x4, dy + y4) * 32) / 32;
break;
case 3: /* Peacock */
color = angle + lut_sin (lut_dist(dx + 20, dy) * 10) / 32 +
angle + lut_sin (lut_dist(dx - 20, dy) * 10) / 32;
break;
case 4:
color = lut_sin (dist) / 16;
break;
case 5: /* 2D Wave + Spiral */
color = lut_cos (x * ANGLE_UNIT / width) / 8 +
lut_cos (y * ANGLE_UNIT / height) / 8 +
angle + lut_sin(dist) / 32;
break;
case 6: /* Peacock, three centers */
color = lut_sin (lut_dist(dx, dy - 20) * 4) / 32+
lut_sin (lut_dist(dx + 20, dy + 20) * 4) / 32+
lut_sin (lut_dist(dx - 20, dy + 20) * 4) / 32;
break;
case 7: /* Peacock, three centers */
color = angle +
lut_sin (lut_dist(dx, dy - 20) * 8) / 32+
lut_sin (lut_dist(dx + 20, dy + 20) * 8) / 32+
lut_sin (lut_dist(dx - 20, dy + 20) * 8) / 32;
break;
case 8: /* Peacock, three centers */
color = lut_sin (lut_dist(dx, dy - 20) * 12) / 32+
lut_sin (lut_dist(dx + 20, dy + 20) * 12) / 32+
lut_sin (lut_dist(dx - 20, dy + 20) * 12) / 32;
break;
case 9: /* Five Arm Star */
color = dist + lut_sin (5 * angle) / 64;
break;
case 10: /* 2D Wave */
color = lut_cos (x * ANGLE_UNIT / width * 2) / 4 +
lut_cos (y * ANGLE_UNIT / height * 2) / 4;
break;
case 11: /* 2D Wave */
color = lut_cos (x * ANGLE_UNIT / width) / 8 +
lut_cos (y * ANGLE_UNIT / height) / 8;
break;
case 12: /* Simple Concentric Rings */
color = dist;
break;
/* Good for testing proper wrapping of angle. This was
* flawed in original Acidwarp 4.10, resulting in a
* double-width stripe going right from the centre.
*/
case 13: /* Simple Rays */
color = angle;
break;
/* Good for testing proper wrapping of negative color.
* Errors will show as a dashed seam going right from centre.
*/
case 14: /* Toothed Spiral Sharp */
color = angle + lut_sin(dist * 8)/32;
break;
case 15: /* Rings with sine */
color = lut_sin(dist * 4)/32;
break;
case 16: /* Rings with sine with sliding inner Rings */
color = dist+ lut_sin(dist * 4) / 32;
break;
case 17:
color = lut_sin(lut_cos(2 * x * ANGLE_UNIT / width)) / (20 + dist)
+ lut_sin(lut_cos(2 * y * ANGLE_UNIT / height)) / (20 + dist);
break;
case 18: /* 2D Wave */
color = lut_cos(7 * x * ANGLE_UNIT / width)/(20 + dist) +
lut_cos(7 * y * ANGLE_UNIT / height)/(20 + dist);
break;
case 19: /* 2D Wave */
color = lut_cos(17 * x * ANGLE_UNIT/width)/(20 + dist) +
lut_cos(17 * y * ANGLE_UNIT/height)/(20 + dist);
break;
case 20: /* 2D Wave Interference */
color = lut_cos(17 * x * ANGLE_UNIT / width) / 32 +
lut_cos(17 * y * ANGLE_UNIT / height) / 32 + dist + angle;
break;
case 21: /* 2D Wave Interference */
color = lut_cos(7 * x * ANGLE_UNIT / width) / 32 +
lut_cos(7 * y * ANGLE_UNIT / height) / 32 + dist;
break;
case 22: /* 2D Wave Interference */
color = lut_cos( 7 * x * ANGLE_UNIT / width) / 32 +
lut_cos( 7 * y * ANGLE_UNIT / height) / 32 +
lut_cos(11 * x * ANGLE_UNIT / width) / 32 +
lut_cos(11 * y * ANGLE_UNIT / height) / 32;
break;
case 23:
color = lut_sin (angle * 7) / 32;
break;
case 24:
color = lut_sin (lut_dist(dx + x1, dy + y1) * 2) / 12 +
lut_sin (lut_dist(dx + x2, dy + y2) * 4) / 12 +
lut_sin (lut_dist(dx + x3, dy + y3) * 6) / 12 +
lut_sin (lut_dist(dx + x4, dy + y4) * 8) / 12;
break;
case 25:
color = angle + lut_sin (lut_dist(dx + x1, dy + y1) * 2) / 16 +
angle + lut_sin (lut_dist(dx + x2, dy + y2) * 4) / 16 +
lut_sin (lut_dist(dx + x3, dy + y3) * 6) / 8 +
lut_sin (lut_dist(dx + x4, dy + y4) * 8) / 8;
break;
case 26:
color = angle + lut_sin (lut_dist(dx + x1, dy + y1) * 2) / 12 +
angle + lut_sin (lut_dist(dx + x2, dy + y2) * 4) / 12 +
angle + lut_sin (lut_dist(dx + x3, dy + y3) * 6) / 12 +
angle + lut_sin (lut_dist(dx + x4, dy + y4) * 8) / 12;
break;
case 27:
color = lut_sin (lut_dist(dx + x1, dy + y1) * 2) / 32 +
lut_sin (lut_dist(dx + x2, dy + y2) * 4) / 32 +
lut_sin (lut_dist(dx + x3, dy + y3) * 6) / 32 +
lut_sin (lut_dist(dx + x4, dy + y4) * 8) / 32;
break;
case 28: /* Random Curtain of Rain (in strong wind) */
if (y == 0 || x == 0)
color = RANDOM (16);
else
color = ( *(buf_graf + (pitch * _y ) + (_x-1))
+ *(buf_graf + (pitch * (_y-1)) + _x)) / 2
+ RANDOM (16) - 8;
break;
case 29:
if (y == 0 || x == 0)
color = RANDOM (1024);
else
color = dist/6 + (*(buf_graf + (pitch * _y ) + (_x-1))
+ *(buf_graf + (pitch * (_y-1)) + _x)) / 2
+ RANDOM (16) - 8;
break;
case 30:
color = xor(xor(lut_sin (lut_dist(dx, dy - 20) * 4) / 32,
lut_sin (lut_dist(dx + 20,dy + 20) * 4) / 32),
lut_sin (lut_dist(dx - 20,dy + 20) * 4) / 32);
break;
case 31:
color = xor(mod(angle, (ANGLE_UNIT/4)), dist);
break;
case 32:
color = xor(dy, dx);
break;
case 33: /* Variation on Rain */
if (y == 0 || x == 0)
color = RANDOM (16);
else
color = ( *(buf_graf + (pitch * _y ) + (_x-1))
+ *(buf_graf + (pitch * (_y-1)) + _x ) ) / 2;
color += RANDOM (2) - 1;
if (color < 64)
color += RANDOM (16) - 8;
break;
case 34: /* Variation on Rain */
if (y == 0 || x == 0)
color = RANDOM (16);
else
color = ( *(buf_graf + (pitch * _y ) + (_x-1))
+ *(buf_graf + (pitch * (_y-1)) + _x ) ) / 2;
if (color < 100)
color += RANDOM (16) - 8;
break;
case 35:
color = angle + lut_sin(dist * 8)/32;
dx = x - xcenter;
dy = (y - ycenter)*2;
dist = lut_dist (dx, dy);
angle = lut_angle (dx, dy);
color = (color + angle + lut_sin(dist * 8)/32) / 2;
break;
case 36:
color = angle + lut_sin (dist * 10) / 16 +
lut_cos (x * ANGLE_UNIT / width * 2) / 8 +
lut_cos (y * ANGLE_UNIT / height * 2) / 8;
dx = x - xcenter;
dy = (y - ycenter)*2;
dist = lut_dist (dx, dy);
angle = lut_angle (dx, dy);
color = (color + angle + lut_sin(dist * 8)/32) / 2;
break;
case 37:
color = angle + lut_sin (dist * 10) / 16 +
lut_cos (x * ANGLE_UNIT / width * 2) / 8 +
lut_cos (y * ANGLE_UNIT / height * 2) / 8;
dx = x - xcenter;
dy = (y - ycenter)*2;
dist = lut_dist (dx, dy);
angle = lut_angle (dx, dy);
color = (color + angle + lut_sin (dist * 10) / 16 +
lut_cos (x * ANGLE_UNIT / width * 2) / 8 +
lut_cos (y * ANGLE_UNIT / height * 2) / 8) / 2;
break;
case 38:
#ifndef ENABLE_FLOAT
if (dy%2)
#else
/* Intent is to interlace two different screens */
if (_y % 2)
#endif
{
dy *= 2;
dist = lut_dist (dx, dy);
angle = lut_angle (dx, dy);
}
color = angle + lut_sin(dist * 8)/32;
break;
case 39:
color = xor(mod(angle, (ANGLE_UNIT/4)), dist);
dx = x - xcenter;
dy = (y - ycenter)*2;
dist = lut_dist (dx, dy);
angle = lut_angle (dx, dy);
color = (color + (xor(mod(angle, (ANGLE_UNIT/4)), dist))) / 2;
break;
case 40:
color = xor(dy, dx);
dx = x - xcenter;
dy = (y - ycenter)*2;
color = (color + xor(dy, dx)) / 2;
break;
default:
color = RANDOM (colors - 1) + 1;
break;
}
/* Fit color value into the palette range using modulo. It seems
that the Turbo-C MOD function does not behave the way I expect.
It gives negative values for the MOD of a negative number.
I expect MOD to function as it does on my HP-28S.
*/
/* Final colors need to go from 1 to colors, because color 0 is
* not used. Floating point conversion to the palette is by
* truncation, not rounding, as if each whole number is a bin
* (0 for 0 to 1, 1 for 1 to 2 and so on). 1 is added later,
* so right here this requires: 0 <= color < colors
*/
_color = (long)color % (colors-1);
#ifdef ENABLE_FLOAT
/* The -1.0 < color < 0 bin is mapped to the last bin,
* meaning right before the 0 <= color < 1 bin in rotation.
*/
if (color < 0)
_color += (colors - 2);
#else
/* This is like in original Acidwarp 4.10. */
if (color < 0)
color += (colors - 1);
#endif
++_color;
/* color 0 is never used, so all colors are from 1 through 255 */
*(buf_graf + (pitch * _y) + _x) = (UCHAR)_color;
/* Store the color in the buffer */
}
/* end for (y = 0; y < height; ++y) */
}
/* end for (x = 0; x < width; ++x) */
#if 0 /* For diagnosis, put palette display line at top of new image */
for (_x = 0; _x < _width; ++_x)
{
color = (_x <= 255) ? _x : 0;
for (_y = 0; _y < 3; ++_y)
*(buf_graf + (pitch * _y) + _x) = (UCHAR)color;
}
#endif
}
#ifndef ENABLE_FLOAT
#undef _xcenter
#undef _ycenter
#undef _width
#undef _height
#undef _x
#undef _y
#undef _color
#endif