/*
=============================================================================
  
  File: SPRITE01.C
  Author: Radouan Khechane (rad@cyberdude.com)
  Date: 31st October 1998
  Description: Displays a sprite on the Net Yaroze PlayStation

  Copyright (c) 1998 by Radouan Khechane.

=============================================================================
*/

/*
====================
  I N C L U D E S
====================
*/
#include <libps.h>                     // PlayStation library
#include "pad.h"                       // joypad header file

/* 
====================
   D E F I N E S
====================
*/
#define OT_LENGTH      (1)             // length of Ordering Table
#define SPRITE_MAX     (1)             // number of sprites
#define SCREEN_WIDTH   (320)           // screen x resolution
#define SCREEN_HEIGHT  (240)           // screen y resolution
#define SPRITE_ADDR    (0x80090000)    // location of TIM in main memory

/* 
====================
   G L O B A L S
====================
*/
GsOT      OT_Header[2];                // Ordering Table Headers
GsOT_TAG  OT_Tag[2][1<<OT_LENGTH];     // Ordering Tables
PACKET    GpuPacketArea[2][SPRITE_MAX * sizeof(GsSPRITE)]; // GPU packet area
GsSPRITE  sprite;                      // sprite handler

u_long PADstatus = 0;    // state of controller pad

/* 
====================
P R O T O T Y P E S
====================
*/
void InitGraphics (void);
void LoadTIM (u_long TIM_addr);
void InitSprite (GsSPRITE *sprite, u_long sprite_addr, short x, short y);
void DrawScreen (void);

/* 
====================
     M A I N
====================
*/
int main (void)
{
    // initialise graphics
    InitGraphics();
    // set up the controller pad
    PadInit();
    // load TIM into video memory
    LoadTIM(SPRITE_ADDR);
    // initialise & setup sprite
    InitSprite(&sprite, SPRITE_ADDR, SCREEN_WIDTH/2, SCREEN_HEIGHT/2);

    // while 'select & start' not pressed
    while (!((PADstatus & PADselect) && (PADstatus & PADstart)))
    {
        PADstatus = PadRead(1);    // read status of controller pad 1
        DrawScreen();
    }

    ResetGraph(3);  // cancel current drawing and flush command queue

    return (0);
}

/*
====================
 F U N C T I O N S
====================
*/

/*
================
 InitGraphics()
================
*/
void InitGraphics (void)
{
    int index;    // index variable

    // declare current video signalling system
    SetVideoMode(MODE_PAL);

    // initialise graphics system
    GsInitGraph(SCREEN_WIDTH, SCREEN_HEIGHT, GsOFSGPU|GsNONINTER, 1, 0);
    // define double buffer
    GsDefDispBuff(0, 0, 0, SCREEN_HEIGHT);

    // set up the ordering table headers
    for (index = 0; index < 2; index++)
    {
        // set to OT length
        OT_Header[index].length = OT_LENGTH;
        // set to OT location
        OT_Header[index].org = OT_Tag[index];
    }
}

/*
================
 LoadTIM()
loads a TIM image from main memory to video memory
================
*/
void LoadTIM (u_long TIM_addr)
{
    RECT     TIM_rect;    // rectangular area to be used for TIM
    GsIMAGE  TIM_data;    // TIM image information

    // store TIM information in image structure
    // note: skip TIM header (+4 bytes) and point to data
    GsGetTimInfo((u_long *)(TIM_addr+4), &TIM_data);

    // Load TIM data to rectangular area for frame buffer
    TIM_rect.x = TIM_data.px;    // TIM x pixel coordinate in frame buffer
    TIM_rect.y = TIM_data.py;    // TIM y pixel coordinate in frame buffer
    TIM_rect.w = TIM_data.pw;    // TIM data width
    TIM_rect.h = TIM_data.ph;    // TIM data height
    // transmit TIM data to rectangular area of frame buffer
    LoadImage(&TIM_rect, TIM_data.pixel);

    // Load TIM CLUT to rectangular area for frame buffer
    TIM_rect.x = TIM_data.cx;    // TIM x clut coordinate in frame buffer
    TIM_rect.y = TIM_data.cy;    // TIM y clut coordinate in frame buffer
    TIM_rect.w = TIM_data.cw;    // TIM clut width
    TIM_rect.h = TIM_data.ch;    // TIM clut height
    // transmit TIM CLUT to rectangular area of frame buffer
    LoadImage(&TIM_rect, TIM_data.clut);

    DrawSync(0);    // wait for transmition to complete
}

/*
================
 InitSprite()
initialise and setup sprite
================
*/
void InitSprite (GsSPRITE *sprite, u_long sprite_addr, short x, short y)
{
    GsIMAGE image;    // sprite (TIM) image

    // store TIM information in image structure
    // note: skip TIM header (+4 bytes) and point to data
    GsGetTimInfo((u_long *)(sprite_addr+4), &image);

    // setup sprite screen coordinates
    sprite->x = x;
    sprite->y = y;

    switch (image.pmode)    // check pixel mode
    {
        case 0x08 :  // 4bit CLUT
                     sprite->attribute = 0x00000000;
                     sprite->w = image.pw * 4;
                     sprite->tpage = GetTPage(0, 0, image.px, image.py);
                     break;
        case 0x09 :  // 8bit CLUT
                     sprite->attribute = 0x01000000;
                     sprite->w = image.pw * 2;
                     sprite->tpage = GetTPage(1, 0, image.px, image.py);
                     break;
        default :    // 16bit DIRECT
                     sprite->attribute = 0x02000000;
                     sprite->w = image.pw;
                     sprite->tpage = GetTPage(2, 0, image.px, image.py);
    }
    // sprite height
    sprite->h = image.ph;
    // texture page offset coordinates
    sprite->u = sprite->v = 0;
    // CLUT location
    sprite->cx = image.cx;
    sprite->cy = image.cy;
    // RGB brightness of sprite
    sprite->r = sprite->g = sprite->b = 128;
    // sprite origin (used for scaling and rotation)
    sprite->mx = sprite->w / 2;    // centre of sprite
    sprite->my = sprite->h / 2;    // centre of sprite
    // sprite scale (ONE = 4097)
    sprite->scalex = sprite->scaley = ONE;    // original size
    // sprite rotation (ONE = 4097 = 1 degree)
    sprite->rotate = 0;    // original orientation
}

/*
================
 DrawScreen()
================
*/
void DrawScreen (void)
{
    int activeBuffer;    // double buffer index

    // get drawing buffer number
    activeBuffer = GsGetActiveBuff();

    // set drawing command storage address
    GsSetWorkBase((PACKET*)GpuPacketArea[activeBuffer]);

    // initialise odering table
    GsClearOt(0, 0, &OT_Header[activeBuffer]);

    // register sprite into the odering table
    GsSortSprite(&sprite, &OT_Header[activeBuffer], 0);

    // wait for completion of all drawing
    DrawSync(0);
    // wait for vertical retrace
    VSync(0);

    // swap double buffers (display and drawing buffer)
    GsSwapDispBuff();

    // register clear (screen) command
    GsSortClear(0x0, 0x0, 0x0, &OT_Header[activeBuffer]);
    // register request to draw ordering table
    GsDrawOt(&OT_Header[activeBuffer]);
}