ref: e5d197d470859f5f951fcbae17da7d6e99a53163
dir: /src/ft2_about.c/
#include <stdio.h> // sprintf()
#include <math.h>
#include "ft2_header.h"
#include "ft2_gui.h"
#include "ft2_pattern_ed.h"
#include "ft2_bmp.h"
#include "ft2_video.h"
#include "ft2_tables.h"
#include "ft2_structs.h"
// ported from original FT2 code
#define NUM_STARS 1000
#define ABOUT_SCREEN_W 626
#define ABOUT_SCREEN_H 167
#define ABOUT_LOGO_W 449
#define ABOUT_LOGO_H 111
#define ABOUT_TEXT_W 349
#define ABOUT_TEXT_H 29
typedef struct
{
int16_t x, y, z;
} vector_t;
typedef struct
{
uint16_t x, y, z;
} rotate_t;
typedef struct
{
vector_t x, y, z;
} matrix_t;
static const uint8_t starColConv[24] = { 2,2,2,2,2,2,2,2, 2,2,2,1,1,1,3,3, 3,3,3,3,3,3,3,3 };
static int16_t hastighet;
static int32_t lastStarScreenPos[NUM_STARS];
static uint32_t randSeed;
static double pi;
static vector_t starcrd[NUM_STARS];
static rotate_t star_a;
static matrix_t starmat;
void seedAboutScreenRandom(uint32_t newseed)
{
randSeed = newseed;
}
static inline int32_t random32(int32_t l) // Turbo Pascal Random() implementation
{
int32_t r;
randSeed *= 134775813;
randSeed += 1;
r = ((int64_t)randSeed * l) >> 32;
return r;
}
static void fixaMatris(rotate_t a, matrix_t *mat)
{
int32_t sa, sb, sc, ca, cb, cc;
// original code used a cos/sin table, but this only runs once per frame, no need...
sa = (int32_t)round(32767.0 * sin(a.x * (2.0 * pi / 65536.0)));
ca = (int32_t)round(32767.0 * cos(a.x * (2.0 * pi / 65536.0)));
sb = (int32_t)round(32767.0 * sin(a.y * (2.0 * pi / 65536.0)));
cb = (int32_t)round(32767.0 * cos(a.y * (2.0 * pi / 65536.0)));
sc = (int32_t)round(32767.0 * sin(a.z * (2.0 * pi / 65536.0)));
cc = (int32_t)round(32767.0 * cos(a.z * (2.0 * pi / 65536.0)));
mat->x.x = (int16_t)(((ca * cc) >> 16) + ((sc * ((sa * sb) >> 16)) >> (16-1)));
mat->y.x = (int16_t)((sa * cb) >> 16);
mat->z.x = (int16_t)(((cc * ((sa * sb) >> 16)) >> (16-1)) - ((ca * sc) >> 16));
mat->x.y = (int16_t)(((sc * ((ca * sb) >> 16)) >> (16-1)) - ((sa * cc) >> 16));
mat->y.y = (int16_t)((ca * cb) >> 16);
mat->z.y = (int16_t)(((sa * sc) >> 16) + ((cc * ((ca * sb) >> 16)) >> (16-1)));
mat->x.z = (int16_t)((cb * sc) >> 16);
mat->y.z = (int16_t)(0 - (sb >> 1));
mat->z.z = (int16_t)((cb * cc) >> 16);
}
static inline int32_t sqr(int32_t x)
{
return x * x;
}
static void aboutInit(void)
{
uint8_t type;
int16_t i;
int32_t r, n, w, h;
double ww;
pi = 4.0 * atan(1.0); // M_PI can not be trusted
type = (uint8_t)random32(4);
switch (type)
{
case 0:
{
hastighet = 309;
for (i = 0; i < NUM_STARS; i++)
{
starcrd[i].z = (int16_t)random32(0xFFFF) - 0x8000;
starcrd[i].y = (int16_t)random32(0xFFFF) - 0x8000;
starcrd[i].x = (int16_t)random32(0xFFFF) - 0x8000;
}
}
break;
case 1:
{
hastighet = 0;
for (i = 0; i < NUM_STARS; i++)
{
if (i < NUM_STARS/4)
{
starcrd[i].z = (int16_t)random32(0xFFFF) - 0x8000;
starcrd[i].y = (int16_t)random32(0xFFFF) - 0x8000;
starcrd[i].x = (int16_t)random32(0xFFFF) - 0x8000;
}
else
{
r = random32(30000);
n = random32(5);
w = ((2 * random32(2)) - 1) * sqr(random32(1000));
ww = (((pi * 2.0) / 5.0) * n) + (r / 12000.0) + (w / 3000000.0);
h = ((sqr(r) / 30000) * (random32(10000) - 5000)) / 12000;
starcrd[i].x = (int16_t)(r * cos(ww));
starcrd[i].y = (int16_t)(r * sin(ww));
starcrd[i].z = (int16_t)h;
}
}
}
break;
case 2:
case 3:
{
hastighet = 0;
for (i = 0; i < NUM_STARS; i++)
{
r = (int32_t)round(sqrt(random32(500) * 500));
w = random32(3000);
ww = ((w * 8) + r) / 16.0;
const int32_t z = (int32_t)round(32767.0 * cos(w * (2.0 * pi / 1024.0)));
const int32_t y = (int32_t)round(32767.0 * sin(w * (2.0 * pi / 1024.0)));
const int32_t x = (int32_t)round(32767.0 * cos(ww * (2.0 * pi / 1024.0))) / 4;
starcrd[i].z = (int16_t)((z * (w + r)) / 3500);
starcrd[i].y = (int16_t)((y * (w + r)) / 3500);
starcrd[i].x = (int16_t)((x * r) / 500);
}
}
break;
default:
break;
}
star_a.x = 0;
star_a.y = 748;
star_a.z = 200;
for (i = 0; i < NUM_STARS; i++)
lastStarScreenPos[i] = -1;
}
static void realStars(void)
{
uint8_t col;
int16_t z, xx, xy, xz, yx, yy, yz, zx, zy, zz;
int32_t x, y, screenBufferPos;
vector_t *star;
xx = starmat.x.x; xy = starmat.x.y; xz = starmat.x.z;
yx = starmat.y.x; yy = starmat.y.y; yz = starmat.y.z;
zx = starmat.z.x; zy = starmat.z.y; zz = starmat.z.z;
for (int16_t i = 0; i < NUM_STARS; i++)
{
// erase last star pixel
screenBufferPos = lastStarScreenPos[i];
if (screenBufferPos >= 0)
{
if (!(video.frameBuffer[screenBufferPos] & 0xFF000000))
video.frameBuffer[screenBufferPos] = video.palette[PAL_BCKGRND];
lastStarScreenPos[i] = -1;
}
star = &starcrd[i];
star->z += hastighet; // this intentionally overflows int16_t
z = ((xz * star->x) + (yz * star->y) + (zz * star->z)) >> 16;
z += 9000;
if (z <= 100) continue;
y = ((xy * star->x) + (yy * star->y) + (zy * star->z)) >> (16-7);
y /= z;
y += (2+ABOUT_SCREEN_H)/2;
if ((uint32_t)y > 2+ABOUT_SCREEN_H) continue;
x = ((xx * star->x) + (yx * star->y) + (zx * star->z)) >> (16-7);
x += x >> 2; // x *= 1.25
x /= z;
x += (2+ABOUT_SCREEN_W)/2;
if ((uint32_t)x > 2+ABOUT_SCREEN_W) continue;
// render star pixel if the pixel under it is the background
screenBufferPos = ((uint32_t)y * SCREEN_W) + (uint32_t)x;
if ((video.frameBuffer[screenBufferPos] >> 24) == PAL_BCKGRND)
{
col = ((uint8_t)~(z >> 8) >> 3) - 14;
if (col < 24)
{
video.frameBuffer[screenBufferPos] = video.palette[starColConv[col]] & 0x00FFFFFF;
lastStarScreenPos[i] = screenBufferPos;
}
}
}
}
void aboutFrame(void)
{
star_a.x += 3*64;
star_a.y += 2*64;
star_a.z -= 1*64;
fixaMatris(star_a, &starmat);
realStars();
}
void showAboutScreen(void) // called once when About screen is opened
{
#define TEXT_BORDER_COL 0x202020
char verText[32];
uint16_t x, y;
if (ui.extended)
exitPatternEditorExtended();
hideTopScreen();
drawFramework(0, 0, 632, 173, FRAMEWORK_TYPE1);
drawFramework(2, 2, 628, 169, FRAMEWORK_TYPE2);
showPushButton(PB_EXIT_ABOUT);
blit32(91, 31, bmp.ft2AboutLogo, ABOUT_LOGO_W, ABOUT_LOGO_H);
setCustomPalColor(TEXT_BORDER_COL); // sets PAL_CUSTOM
const char *infoString = "Clone by Olav \"8bitbubsy\" S\025rensen";
x = (SCREEN_W - textWidth(infoString)) >> 1;
y = 147;
textOutBorder(x, y, PAL_FORGRND, PAL_CUSTOM, infoString);
sprintf(verText, "v%s (compiled on %s)", PROG_VER_STR, __DATE__);
x = (SCREEN_W - textWidth(verText)) >> 1;
y = 159;
textOutBorder(x, y, PAL_FORGRND, PAL_CUSTOM, verText);
aboutInit();
ui.aboutScreenShown = true;
}
void hideAboutScreen(void)
{
hidePushButton(PB_EXIT_ABOUT);
ui.aboutScreenShown = false;
}
void exitAboutScreen(void)
{
hideAboutScreen();
showTopScreen(true);
}