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#include "spr_defs.h"

/* Camera and CRT test.

   Draws gray cross across the screen, few color boxes at top left and moves around camera captured screen left/right

   in the middle. */

#define CAMERA_BASE     0x88000000

#define CRT_BASE        0xc0000000

#define VIDEO_RAM_START 0xa8000000      /* till including a83ffffc */

#define SCREEN_X        640

#define SCREEN_Y        480

#define CAMERA_X        352

#define CAMERA_Y        288

#define CAMERA_BUF(idx) (VIDEO_RAM_START + (idx) * CAMERA_X * CAMERA_Y)

#define FRAME_BUF       (CAMERA_BUF(2))

#define CAMERA_POS      (camera_pos_x + ((SCREEN_Y - CAMERA_Y) / 2) * SCREEN_X)

#define MIN(x,y)        ((x) < (y) ? (x) : (y))

#define set_mem32(addr,val)  (*((unsigned long *) (addr)) = (val))

#define get_mem32(addr)  (*((unsigned long *) (addr)))

#define set_palette(idx,r,g,b) set_mem32 (CRT_BASE + 0x400 + (idx) * 4, (((r) >> 3) << 11) | (((g) >> 2) << 5) | (((b) >> 3) << 0))

#define put_pixel(xx,yy,idx)   (*(unsigned char *)(FRAME_BUF + (xx) + (yy) * SCREEN_X) = (idx))

/* For writing into SPR. */

void mtspr(unsigned long spr, unsigned long value)

{

  asm("l.mtspr\t\t%0,%1,0": : "r" (spr), "r" (value));

}

/* For reading SPR. */

unsigned long mfspr(unsigned long spr)

{

  unsigned long value;

  asm("l.mfspr\t\t%0,%1,0" : "=r" (value) : "r" (spr));

  return value;

}

int camera_pos_x;

int camera_move_speed = 1;

int current_buf;

void int_main ()

{

  /* Change base addresse of camera */

  set_mem32 (CAMERA_BASE, CAMERA_BUF(current_buf)); /* Set address to store to */

  /* Change base addresse of crt */

  set_mem32 (CRT_BASE + 8, CAMERA_BUF(1 - current_buf)); /* Tell CRT when camera buffer is */

  uart_print_str("\n ");

  uart_print_long(CAMERA_BUF(current_buf));

  uart_print_str("\n ");

  current_buf = 1 - current_buf;

  /* move the camera screen around */

  camera_pos_x += camera_move_speed;

  if (camera_pos_x >= SCREEN_X - CAMERA_X || camera_pos_x <= 0)

    camera_move_speed = -camera_move_speed;

  mtspr(SPR_PICSR, 0);

}

void crt_enable ()

{

  int i, x, y;

  /* Init CRT */

  set_mem32 (CRT_BASE + 4, FRAME_BUF); /* Frame buffer start */

  set_mem32 (CRT_BASE, get_mem32 (CRT_BASE) | 1);          /* Enable CRT only */

  /* Init palette */

  for (i = 0; i < 32; i++) {

    set_palette (8 * i + 0, 0x00, 0x00, 0x00); /* black */

    set_palette (8 * i + 1, 0xff, 0xff, 0xff); /* white */

    set_palette (8 * i + 2, 0x7f, 0x7f, 0x7f); /* gray */

    set_palette (8 * i + 3, 0xff, 0x00, 0x00); /* red */

    set_palette (8 * i + 4, 0x00, 0xff, 0x00); /* green */

    set_palette (8 * i + 5, 0x00, 0x00, 0xff); /* blue */

    set_palette (8 * i + 6, 0x00, 0xff, 0xff); /* cyan */

    set_palette (8 * i + 7, 0xff, 0x00, 0xff); /* purple */

  }

  for (x = 0; x < SCREEN_X; x++)

    for (y = 0; y < SCREEN_Y; y++)

      put_pixel(x, y, 3);

}

void crt_test ()

{

  int i, x, y;

  for (x = 0; x < SCREEN_X; x++)

    for (y = 0; y < SCREEN_Y; y++)

      put_pixel(x, y, 0);

 /* Draw gray X */

  for (i = 0; i < SCREEN_Y; i++) {

    put_pixel (i, i, 2);

    put_pixel (SCREEN_X - i - 1, i, 1);

  }

  /* Draw color boxes */

  for (y = 0; y < 50; y++)

    for (x = 0; x < 50; x++)

        for (i = 0; i < 8; i++)

          put_pixel (i * 50 + x, y, i);

}

void crt_disable ()

{

  set_mem32 (CRT_BASE, get_mem32 (CRT_BASE) & ~1);             /* Disable CRT */

}

void camera_enable ()

{

  /* Init Camera */

  set_mem32 (CAMERA_BASE, CAMERA_BUF(current_buf = 0)); /* Set address to store to */

  set_mem32 (CAMERA_BASE + 4, 1);         /* Enable it */

  /* Init CRT to display camera */

  set_mem32 (CRT_BASE + 8, CAMERA_BUF(1 - current_buf)); /* Tell CRT when camera buffer is */

  camera_pos_x = 0;

  set_mem32 (CRT_BASE + 0xc, CAMERA_POS);

  set_mem32 (CRT_BASE, get_mem32 (CRT_BASE) | 2);         /* Enable camera overlay */

  /* Enable interrupts */

  mtspr (SPR_SR, mfspr(SPR_SR) | SPR_SR_IEE);

  mtspr (SPR_PICMR, mfspr(SPR_PICSR) | (1 << 13));

}

void camera_disable ()

{

  /* Disable interrupts */

  mtspr (SPR_SR, mfspr(SPR_SR) & ~SPR_SR_IEE);

  mtspr (SPR_PICMR, mfspr(SPR_PICSR) & ~(1 << 13));

  /* Disable Camera */

  set_mem32 (CAMERA_BASE + 4, 1);         /* Enable it */

  set_mem32 (CRT_BASE, get_mem32 (CRT_BASE) & ~2);                           /* Disable camera overlay */

}