/*---------------------------------------------------------------------------*
  Project:  TwlSDK - GX - demos - UnitTours/Sub_Oam_4
 File:     main.c

  Copyright 2003-2009 Nintendo. All rights reserved.

  These coded instructions, statements, and computer programs contain
  proprietary information of Nintendo of America Inc. and/or Nintendo
  Company Ltd., and are protected by Federal copyright law. They may
  not be disclosed to third parties or copied or duplicated in any form,
  in whole or in part, without the prior written consent of Nintendo.

  $Date:: 2009-06-04#$
  $Rev: 10698 $
  $Author: okubata_ryoma $
 *---------------------------------------------------------------------------*/
//---------------------------------------------------------------------------
// A sample that flips OBJs.
//
// USAGE:
//   A: Flips horizontally
//   B: Flips vertically
//
// HOWTO:
// 1. Set up the character/palette/attribute data the same as for Sub_Oam_1
// 2. Flip horizontally/vertically by setting corresponding fields
//---------------------------------------------------------------------------
#ifdef SDK_TWL
#include <twl.h>
#else
#include <nitro.h>
#endif
#include "DEMO.h"
#include "data.h"

static GXOamAttr sOamBak[128];         // Buffer for OAM

#ifdef SDK_TWL
void TwlMain(void)
#else
void NitroMain(void)
#endif
{
    int     flip_H = 0, flip_V = 0;

    //---------------------------------------------------------------------------
    // Initialize:
    // They enable IRQ interrupts, initialize VRAM, and make the OBJ visible.
    //---------------------------------------------------------------------------
    DEMOInitCommon();
    DEMOInitVRAM();
    DEMOInitDisplaySubOBJOnly();

    //---------------------------------------------------------------------------
    // Transmitting the character data and the palette data
    //---------------------------------------------------------------------------
    GXS_LoadOBJ(d_64_256_obj_schDT, 0, sizeof(d_64_256_obj_schDT));
    GXS_LoadOBJPltt(d_64_256_obj_sclDT, 0, sizeof(d_64_256_obj_sclDT));

    MI_DmaFill32(3, sOamBak, 192, sizeof(sOamBak));     // Clear OAM buffer

    G2_SetOBJAttr(&sOamBak[0],         // Pointer to the attributes
                  0,                   // X
                  0,                   // Y
                  0,                   // Priority
                  GX_OAM_MODE_NORMAL,  // OBJ mode
                  FALSE,               // Mosaic
                  GX_OAM_EFFECT_NONE,  // Flip/affine/no display/affine(double)
                  GX_OAM_SHAPE_64x64,  // Size and shape
                  GX_OAM_COLORMODE_256, // OBJ character data is in 256-color format
                  0,                   // Character name
                  0,                   // Color param
                  0                    // Affine param
        );

    DEMOStartDisplay();
    //---------------------------------------------------------------------------
    // Main Loop
    //---------------------------------------------------------------------------
    while (1)
    {
        DEMOReadKey();

        if (DEMO_IS_TRIG(PAD_BUTTON_A))
        {
            ++flip_H;
            flip_H %= 2;
        }
        if (DEMO_IS_TRIG(PAD_BUTTON_B))
        {
            ++flip_V;
            flip_V %= 2;
        }

        {
            GXOamEffect effect = (GXOamEffect)0;
            if (flip_H)
                effect |= GX_OAM_EFFECT_FLIP_H;
            if (flip_V)
                effect |= GX_OAM_EFFECT_FLIP_V;

            //---------------------------------------------------------------------------
            // G2_SetOBJEffect:
            // Produces effects such as flip/scale and rotation
            //---------------------------------------------------------------------------
            G2_SetOBJEffect(&sOamBak[0], effect, 0      // Select affine params if GX_OAM_EFFECT_AFFINE or GX_OAM_EFFECT_AFFINE_DOUBLE is selected
                );
        }

        // Store the data in main memory and invalidate the cache
        DC_FlushRange(sOamBak, sizeof(sOamBak));
        /* I/O register is accessed using DMA operation, so cache wait is not needed */
        // DC_WaitWriteBufferEmpty();

        OS_WaitVBlankIntr();           // Waiting for the end of the V-Blank interrupt

        GXS_LoadOAM(sOamBak, 0, sizeof(sOamBak));
    }
}

//---------------------------------------------------------------------------
// V-Blank interrupt function:
//
// Interrupt handlers are registered on the interrupt table by OS_SetIRQFunction.
// OS_EnableIrqMask selects IRQ interrupts to enable, and
// OS_EnableIrq enables IRQ interrupts.
// Notice that you have to call OS_SetIrqCheckFlag to check a V-Blank interrupt.
//---------------------------------------------------------------------------
void VBlankIntr(void)
{
    OS_SetIrqCheckFlag(OS_IE_V_BLANK); // Checking V-Blank interrupt
}