1 /*---------------------------------------------------------------------------*
2 Project: TwlSDK - GX - demos - UnitTours/2D_CharBg_2
3 File: main.c
4
5 Copyright 2003-2008 Nintendo. All rights reserved.
6
7 These coded instructions, statements, and computer programs contain
8 proprietary information of Nintendo of America Inc. and/or Nintendo
9 Company Ltd., and are protected by Federal copyright law. They may
10 not be disclosed to third parties or copied or duplicated in any form,
11 in whole or in part, without the prior written consent of Nintendo.
12
13 $Date:: 2008-09-18#$
14 $Rev: 8573 $
15 $Author: okubata_ryoma $
16 *---------------------------------------------------------------------------*/
17
18 //---------------------------------------------------------------------------
19 // A sample that uses BG #2 as affine mode (rotate):
20 //
21 // USAGE:
22 // UP, DOWN, LEFT, RIGHT : Change the center of rotation
23 // L,R: Rotate BG #2
24 //
25 // HOWTO:
26 // 1. Set up the character/palette/screen data same as 2D_CharBG_1.
27 // 2. Set up a matrix and points with G2_SetBGxAffine().
28 //---------------------------------------------------------------------------
29
30 #include <nitro/code32.h> // avoid byte access problems
31 #ifdef SDK_TWL
32 #include <twl.h>
33 #else
34 #include <nitro.h>
35 #endif
36 #include "DEMO.h"
37 #include "data.h"
38
39 static u8 sScrnBuf[SCREEN_SIZE]; // Buffer for screen data (BG #2)
40
41 #ifdef SDK_TWL
TwlMain(void)42 void TwlMain(void)
43 #else
44 void NitroMain(void)
45 #endif
46 {
47 s16 x_0 = 0, y_0 = 0;
48 s16 x_1 = 0, y_1 = 0;
49
50 u16 rotate = 0;
51
52 //---------------------------------------------------------------------------
53 // Initialize:
54 // Enables IRQ interrupts, initializes VRAM, and sets BG #2 for affine mode.
55 //---------------------------------------------------------------------------
56 DEMOInitCommon();
57 DEMOInitVRAM();
58 DEMOInitDisplayBG2Only();
59
60 //---------------------------------------------------------------------------
61 // Transmitting the character data and the palette data
62 //---------------------------------------------------------------------------
63 GX_LoadBG2Char(d_64_256_bg_schDT, 0, sizeof(d_64_256_bg_schDT));
64 GX_LoadBGPltt(d_64_256_bg_sclDT, 0, sizeof(d_64_256_bg_sclDT));
65
66 {
67 int i, j;
68 for (i = 0; i < 8; i++)
69 {
70 for (j = 0; j < 8; j++)
71 {
72 sScrnBuf[(i * 16) + j] = (u8)((i * 0x10) + j);
73 }
74 }
75 }
76 // Store the data in the main memory, and invalidate the cache.
77 DC_FlushRange(sScrnBuf, sizeof(sScrnBuf));
78 /* I/O register is accessed using DMA operation, so cache wait is not needed */
79 // DC_WaitWriteBufferEmpty();
80
81 // DMA Transfer to BG #2 screen
82 GX_LoadBG2Scr(sScrnBuf, 0, sizeof(sScrnBuf));
83
84 DEMOStartDisplay();
85 //---------------------------------------------------------------------------
86 // Main Loop
87 //---------------------------------------------------------------------------
88 while (1)
89 {
90 MtxFx22 mtx;
91 fx16 sinVal, cosVal;
92
93 DEMOReadKey();
94
95 if (DEMO_IS_PRESS(PAD_KEY_UP))
96 y_0 -= 2;
97 if (DEMO_IS_PRESS(PAD_KEY_DOWN))
98 y_0 += 2;
99 if (DEMO_IS_PRESS(PAD_KEY_RIGHT))
100 x_0 += 2;
101 if (DEMO_IS_PRESS(PAD_KEY_LEFT))
102 x_0 -= 2;
103 if (DEMO_IS_PRESS(PAD_BUTTON_L))
104 rotate -= 256;
105 if (DEMO_IS_PRESS(PAD_BUTTON_R))
106 rotate += 256;
107 if (DEMO_IS_TRIG(PAD_BUTTON_SELECT))
108 {
109 x_0 = 32;
110 y_0 = 32;
111 rotate = 0;
112 }
113
114 sinVal = FX_SinIdx(rotate);
115 cosVal = FX_CosIdx(rotate);
116
117 mtx._00 = (fx32)cosVal;
118 mtx._01 = (fx32)sinVal;
119 mtx._10 = -(fx32)sinVal;
120 mtx._11 = (fx32)cosVal;
121
122 #ifdef SDK_AUTOTEST
123 x_0 = 10;
124 y_0 = 15;
125 rotate = 4096; // default params for testing.
126 GX_SetBankForLCDC(GX_VRAM_LCDC_C);
127 EXT_TestSetVRAMForScreenShot(GX_VRAM_LCDC_C);
128 EXT_TestScreenShot(100, 0xD4F05FD3);
129 EXT_TestTickCounter();
130 #endif //SDK_AUTOTEST
131
132 OS_WaitVBlankIntr(); // Waiting for the end of the VBlank interrupt
133
134 //---------------------------------------------------------------------------
135 // Set up affine transformation of BG #2
136 //---------------------------------------------------------------------------
137 G2_SetBG2Affine(&mtx, // a matrix for rotation and scaling
138 x_0, y_0, // the center of rotation
139 x_1, y_1 // the reference point before rotation and scaling applied
140 );
141 }
142 }
143
144 //---------------------------------------------------------------------------
145 // VBlank interrupt function:
146 //
147 // Interrupt handlers are registered on the interrupt table by OS_SetIRQFunction.
148 // OS_EnableIrqMask selects IRQ interrupts to enable, and
149 // OS_EnableIrq enables IRQ interrupts.
150 // Notice that you have to call 'OS_SetIrqCheckFlag' to check a VBlank interrupt.
151 //---------------------------------------------------------------------------
VBlankIntr(void)152 void VBlankIntr(void)
153 {
154 OS_SetIrqCheckFlag(OS_IE_V_BLANK); // Checking VBlank interrupt
155 }
156