/*---------------------------------------------------------------------------*
  Project:  TwlSDK - GX - demos - UnitTours/2D_CharBg_Direct
  File:     main.c

  Copyright 2003-2008 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.

  $Date:: 2008-09-17#$
  $Rev: 8556 $
  $Author: okubata_ryoma $
 *---------------------------------------------------------------------------*/

//---------------------------------------------------------------------------
// A sample that use direct color BITMAP BG:
// 
// This sample display picture on the display by direct color BITMAP BG
// 
// USAGE:
//   UP, DOWN, LEFT, RIGHT      : Slide the BG
//   A, B                       : Scale the BG
//   L, R                       : Rotate the BG
//   SELECT + [UP, DOWN, LEFT, RIGHT] : Change the center of rotation
//   SELECT                     : Toggle the BG area over mode between 
//                                loop and transparent
// 
// HOWTO:
// 1. Transfer the bitmap data with GX_LoadBGxScr
// 2. Set the direct color BG mode with G2_SetBGxControlDCBmp
//---------------------------------------------------------------------------


#ifdef SDK_TWL
#include <twl.h>
#else
#include <nitro.h>
#endif
#include "DEMO.h"
#include "data.h"
//---------------------------------------------------------------------------
//  Summary:
//     V-Blank interrupt process
//  Description:
//     Enables a flag that confirms that a V-Blank interrupt has been performed
//
//        The following steps will be performed during common initialization (DEMOInitCommon), causing this function to be called during V-Blanks
//        * Select IRQ interrupt (OS_SetIrqMask)
//        * Register this function, which performs IRQ interrupts (OS_SetIRQFunction)
//        * Enable IRQ interrupts (OS_EnableIrq)
//        
//---------------------------------------------------------------------------
void VBlankIntr(void)
{
    OS_SetIrqCheckFlag(OS_IE_V_BLANK); // Sets a V-Blank interrupt confirmation flag
}

//---------------------------------------------------------------------------
//  Summary:
//        Display affine extended direct color bit map BG
//  Description:
//        Performs affine conversions (rotate / scale) on a 256-color bitmap background and displays the result
//       
//
//        1. Use BG surface 3 with BGMODE number 3
//        2. Perform the configuration in G2_SetBG3ControlDCBmp, and transmit the character data to the specified location
//          
//        3. Transfer screen data to the specified location
//  Controls:
//        PLUS_KEY         : BG screen offset operation
//        SELECT + PLUS_KEY: Manipulate center position for rotating and scaling
//        BUTTON_A, B : Enlarge, reduce
//        BUTTON_L, R : Rotate
//        SELECT     : Area over process switch
//        START      : Initialize settings values
//---------------------------------------------------------------------------
#ifdef SDK_TWL
void TwlMain(void)
#else
void NitroMain(void)
#endif
{
    int     trg = 0;
    int     offset_H = 0;
    int     offset_V = 30;
    fx32    scale = FX32_ONE;
    s16     x_0 = 0, y_0 = 0;
    s16     x_1 = 0, y_1 = 0;
    u16     rotate = 0;
    
    GXBGAreaOver area_over = GX_BG_AREAOVER_XLU;
    
    //---------------------
    // Initialization
    //---------------------
    DEMOInitCommon();
    DEMOInitVRAM();

    /* BG configuration */
    GX_SetBankForBG(GX_VRAM_BG_256_AB); // Allocate VRAM-A, B banks to BG

    GX_SetGraphicsMode(GX_DISPMODE_GRAPHICS,    // 2D/3D mode
                       GX_BGMODE_3,    // BGMODE 3
                       GX_BG0_AS_2D);  // 2D display to BG0

    GX_SetBGScrOffset(GX_BGSCROFFSET_0x00000);  // Set screen offset value
    GX_SetBGCharOffset(GX_BGCHAROFFSET_0x10000);        // Set character offset

    GX_SetVisiblePlane(GX_PLANEMASK_BG3);       // Select BG3 for display
    G2_SetBG3Priority(0);              // Set BG3 priority to top
    G2_BG3Mosaic(FALSE);               // Do not apply mosaic to BG3
    
    /* Set BG3 to a screen size of 256x256 dots, and a direct color bitmap */
    {
        //   Set BG3 to direct color bitmap BG
        //   Screen size: Use a screen size of 256x256 pixels
        //   Area overflow processing: Determined by area_over
        //   Screen base block: 0x00000
        G2_SetBG3ControlDCBmp(GX_BG_SCRSIZE_DCBMP_256x256, area_over, GX_BG_BMPSCRBASE_0x00000);
    }

    /* Transfer bitmap data to BG3 */
    GX_LoadBG3Bmp(bitmapBG_directcolor_Texel, 0, SCREEN_SIZE);

    DEMOStartDisplay();

    //---------------------
    //  Main loop
    //---------------------
    while (1)
    {
        MtxFx22 mtx;

        /* Reading pad information and controls */
        DEMOReadKey();

#ifdef SDK_AUTOTEST                    // Code for auto-test
        {
            const EXTKeys keys[8] =
                { {PAD_BUTTON_A, 10}, {PAD_BUTTON_L, 10}, {PAD_KEY_UP | PAD_KEY_RIGHT, 20} };
            EXT_AutoKeys(keys, &gKeyWork.press, &gKeyWork.trigger);
        }
#endif

        if (DEMO_IS_PRESS(PAD_BUTTON_SELECT))
        {
            if (DEMO_IS_PRESS(PAD_KEY_UP))
                y_0 -= 2;
            if (DEMO_IS_PRESS(PAD_KEY_DOWN))
                y_0 += 2;
            if (DEMO_IS_PRESS(PAD_KEY_RIGHT))
                x_0 += 2;
            if (DEMO_IS_PRESS(PAD_KEY_LEFT))
                x_0 -= 2;
        }
        else
        {
            if (DEMO_IS_PRESS(PAD_KEY_UP))
                offset_V += 2;
            if (DEMO_IS_PRESS(PAD_KEY_DOWN))
                offset_V -= 2;
            if (DEMO_IS_PRESS(PAD_KEY_RIGHT))
                offset_H -= 2;
            if (DEMO_IS_PRESS(PAD_KEY_LEFT))
                offset_H += 2;
        }
        if (DEMO_IS_PRESS(PAD_BUTTON_A))
            scale += 2 << (FX32_SHIFT - 8);
        if (DEMO_IS_PRESS(PAD_BUTTON_B))
            scale -= 2 << (FX32_SHIFT - 8);
        if (DEMO_IS_PRESS(PAD_BUTTON_L))
            rotate -= 256;
        if (DEMO_IS_PRESS(PAD_BUTTON_R))
            rotate += 256;
        if (DEMO_IS_TRIG(PAD_BUTTON_SELECT))
        {
            trg = (trg + 1) & 0x01;
            OS_Printf("area_over=%d\n", trg);
        }

        if (DEMO_IS_TRIG(PAD_BUTTON_START))
        {
            offset_H = 0;
            offset_V = 0;
            x_0 = 32;
            y_0 = 32;
            scale = 1 << FX32_SHIFT;
            rotate = 0;
        }

        /* Set BG3 to a screen size of 256x256 dots, and a direct color bitmap */
        {
            GXBGAreaOver area_over = (trg ? GX_BG_AREAOVER_REPEAT : GX_BG_AREAOVER_XLU);

            //   Set BG3 to direct color bitmap BG
            //   Screen size: Use a screen size of 256x256 pixels
            //   Area overflow processing: Determined by area_over
            //   Screen base block: 0x00000
            G2_SetBG3ControlDCBmp(GX_BG_SCRSIZE_DCBMP_256x256, area_over, GX_BG_BMPSCRBASE_0x00000);
        }

        /* Generate affine conversion matrix */
        {
            fx16    sinVal = FX_SinIdx(rotate);
            fx16    cosVal = FX_CosIdx(rotate);
            fx32    rScale = FX_Inv(scale);

            mtx._00 = (fx32)((cosVal * rScale) >> FX32_SHIFT);
            mtx._01 = (fx32)((sinVal * rScale) >> FX32_SHIFT);
            mtx._10 = -(fx32)((sinVal * rScale) >> FX32_SHIFT);
            mtx._11 = (fx32)((cosVal * rScale) >> FX32_SHIFT);
        }

#ifdef SDK_AUTOTEST                    // Code for auto-test
        GX_SetBankForLCDC(GX_VRAM_LCDC_C);
        EXT_TestSetVRAMForScreenShot(GX_VRAM_LCDC_C);
        EXT_TestScreenShot(100, 0x874F90B5);
        EXT_TestTickCounter();
#endif //SDK_AUTOTEST

        /* V-Blank wait */
        OS_WaitVBlankIntr();

        /* configure the affine conversion that is applied to the BG3 surface */
        G2_SetBG3Affine(&mtx,          // Conversion matrix
                        x_0,           // Rotation center (x) coordinate
                        y_0,           // Rotation center (y) coordinate
                        offset_H,      // Pre-rotation coordinate (x)
                        offset_V);     // Pre-rotation coordinate (y)
    }
}