ref: 9a68288e24cad7eb3efa3e628fc131a19271416c
dir: /src/ft2_about.c/
#include <stdio.h> // sprintf()
#include <math.h>
#include "ft2_header.h"
#include "ft2_gui.h"
#include "ft2_bmp.h"
#include "ft2_video.h"
#include "ft2_structs.h"
#include "ft2_pattern_ed.h" // exitPatternEditorExtended()
#define SINUS_PHASES 1024
#define NUM_STARS 2000
#define ABOUT_SCREEN_X 3
#define ABOUT_SCREEN_Y 3
#define ABOUT_SCREEN_W 626
#define ABOUT_SCREEN_H 167
#define ABOUT_LOGO_W 449
#define ABOUT_LOGO_H 110
typedef struct
{
float x, y, z;
} vector_t;
typedef struct
{
vector_t x, y, z;
} matrix_t;
static char *customText1 = "Clone by Olav \"8bitbubsy\" S\025rensen";
static char *customText2 = "https://16-bits.org";
static char customText3[256];
static int16_t customText1Y, customText2Y, customText3Y, customText1X, customText2X, customText3X;
static int16_t sin16[SINUS_PHASES], cos16[SINUS_PHASES];
static int32_t sinPage, cosPage;
static uint32_t randSeed;
static vector_t starPoints[NUM_STARS], rotation;
static matrix_t matrix;
void seedAboutScreenRandom(uint32_t newseed)
{
randSeed = newseed;
}
static int32_t random32(void)
{
randSeed *= 134775813;
randSeed += 1;
return randSeed;
}
static void rotateMatrix(void)
{
#define MY_2PI_FLOAT 6.2831853071796f
const float x2pi = rotation.x * MY_2PI_FLOAT;
const float sa = sinf(x2pi);
const float ca = cosf(x2pi);
const float y2pi = rotation.y * MY_2PI_FLOAT;
const float sb = sinf(y2pi);
const float cb = cosf(y2pi);
const float z2pi = rotation.z * MY_2PI_FLOAT;
const float sc = sinf(z2pi);
const float cc = cosf(z2pi);
// x
matrix.x.x = (ca * cc) + (sc * sa * sb);
matrix.y.x = sa * cb;
matrix.z.x = (cc * sa * sb) - (ca * sc);
// y
matrix.x.y = (sc * ca * sb) - (sa * cc);
matrix.y.y = ca * cb;
matrix.z.y = (sa * sc) + (cc * ca * sb);
// z
matrix.x.z = cb * sc;
matrix.y.z = -sb;
matrix.z.z = cb * cc;
}
void initAboutScreen(void)
{
vector_t *s = starPoints;
for (int32_t i = 0; i < NUM_STARS; i++, s++)
{
s->x = (float)(random32() * (1.0 / (UINT32_MAX+1.0)));
s->y = (float)(random32() * (1.0 / (UINT32_MAX+1.0)));
s->z = (float)(random32() * (1.0 / (UINT32_MAX+1.0)));
}
// pre-calc sinus/cosinus tables
for (int32_t i = 0; i < SINUS_PHASES; i++)
{
sin16[i] = (int16_t)round(32767.0 * sin(i * M_PI * 2.0 / SINUS_PHASES));
cos16[i] = (int16_t)round(32767.0 * cos(i * M_PI * 2.0 / SINUS_PHASES));
}
sinPage = cosPage = 0;
}
static void blendPixel(int32_t x, int32_t y, uint32_t r, uint32_t g, uint32_t b, uint16_t alpha)
{
uint32_t *p = &video.frameBuffer[(y * SCREEN_W) + x];
const uint32_t srcPixel = *p;
const uint32_t srcR = RGB32_R(srcPixel);
const uint32_t srcG = RGB32_G(srcPixel);
const uint32_t srcB = RGB32_B(srcPixel);
r = ((srcR * (alpha ^ 65535)) + (r * alpha)) >> 16;
g = ((srcG * (alpha ^ 65535)) + (g * alpha)) >> 16;
b = ((srcB * (alpha ^ 65535)) + (b * alpha)) >> 16;
*p = RGB32(r, g, b);
}
static void starfield(void)
{
vector_t *star = starPoints;
for (int16_t i = 0; i < NUM_STARS; i++, star++)
{
star->z += 0.0001f;
if (star->z >= 0.5f)
star->z -= 1.0f;
const float z = (matrix.x.z * star->x) + (matrix.y.z * star->y) + (matrix.z.z * star->z) + 0.5f;
if (z <= 0.0f)
continue;
float y = (((matrix.x.y * star->x) + (matrix.y.y * star->y) + (matrix.z.y * star->z)) / z) * 400.0f;
const int32_t outY = (ABOUT_SCREEN_Y+(ABOUT_SCREEN_H/2)) + (int32_t)y;
if (outY < ABOUT_SCREEN_Y || outY >= ABOUT_SCREEN_Y+ABOUT_SCREEN_H)
continue;
float x = (((matrix.x.x * star->x) + (matrix.y.x * star->y) + (matrix.z.x * star->z)) / z) * 400.0f;
const int32_t outX = (ABOUT_SCREEN_X+(ABOUT_SCREEN_W/2)) + (int32_t)x;
if (outX < ABOUT_SCREEN_X || outX >= ABOUT_SCREEN_X+ABOUT_SCREEN_W)
continue;
int32_t d = (int32_t)(z * 256.0f);
if (d > 255)
d = 255;
d ^= 255;
// add a tint of blue to the star pixel
int32_t r = d - 79;
if (r < 0)
r = 0;
int32_t g = d - 38;
if (g < 0)
g = 0;
int32_t b = d + 64;
if (b > 255)
b = 255;
// blend sides of star
const uint16_t sidesAlpha = 13000;
if (outX-1 >= ABOUT_SCREEN_X)
blendPixel(outX-1, outY, r, g, b, sidesAlpha);
if (outX+1 < ABOUT_SCREEN_X+ABOUT_SCREEN_W)
blendPixel(outX+1, outY, r, g, b, sidesAlpha);
if (outY-1 >= ABOUT_SCREEN_Y)
blendPixel(outX, outY-1, r, g, b, sidesAlpha);
if (outY+1 < ABOUT_SCREEN_Y+ABOUT_SCREEN_H)
blendPixel(outX, outY+1, r, g, b, sidesAlpha);
// plot main star pixel
blendPixel(outX, outY, r, g, b, 60000);
}
}
void renderAboutScreenFrame(void)
{
// remember when you couldn't do this per frame?
clearRect(ABOUT_SCREEN_X, ABOUT_SCREEN_Y, ABOUT_SCREEN_W, ABOUT_SCREEN_H);
// 3D starfield
rotateMatrix();
rotation.x -= 0.00009f;
rotation.z += 0.00006f;
starfield();
// waving logo
for (int32_t y = 0; y < ABOUT_SCREEN_H; y++)
{
for (int32_t x = 0; x < ABOUT_SCREEN_W; x++)
{
int32_t xx = (((ABOUT_LOGO_W/2)+x) - 310) + (sin16[(sinPage+(x )) & (SINUS_PHASES-1)] >> 10);
int32_t yy = (((ABOUT_LOGO_H/2)+y) - 75) + (sin16[(cosPage+(y+(x<<1))) & (SINUS_PHASES-1)] >> 11);
if (xx >= 0 && xx < ABOUT_LOGO_W && yy >= 0 && yy < ABOUT_LOGO_H)
{
const uint32_t pixel = bmp.ft2AboutLogo[(yy * ABOUT_LOGO_W) + xx];
if (pixel != 0x00FF00)
video.frameBuffer[((ABOUT_SCREEN_X+y) * SCREEN_W) + (ABOUT_SCREEN_Y+x)] = pixel;
}
}
}
sinPage += 2;
if (sinPage >= SINUS_PHASES)
sinPage -= SINUS_PHASES;
cosPage += 3;
if (cosPage >= SINUS_PHASES)
cosPage -= SINUS_PHASES;
// static text
textOut(customText1X, customText1Y, PAL_FORGRND, customText1);
textOut(customText2X, customText2Y, PAL_FORGRND, customText2);
textOut(customText3X, customText3Y, PAL_FORGRND, customText3);
showPushButton(PB_EXIT_ABOUT);
}
void showAboutScreen(void) // called once when about screen is opened
{
if (ui.extendedPatternEditor)
exitPatternEditorExtended();
hideTopScreen();
drawFramework(0, 0, 632, 173, FRAMEWORK_TYPE1);
drawFramework(2, 2, 628, 169, FRAMEWORK_TYPE2);
showPushButton(PB_EXIT_ABOUT);
sprintf(customText3, "v%s (%s)", PROG_VER_STR, __DATE__);
customText1X = (SCREEN_W - textWidth(customText1)) / 2;
customText2X = (SCREEN_W-8) - textWidth(customText2);
customText3X = (SCREEN_W-8) - textWidth(customText3);
customText1Y = 157;
customText2Y = 157-12;
customText3Y = 157;
ui.aboutScreenShown = true;
}
void hideAboutScreen(void)
{
hidePushButton(PB_EXIT_ABOUT);
ui.aboutScreenShown = false;
}
void exitAboutScreen(void)
{
hideAboutScreen();
showTopScreen(true);
}