1 /*---------------------------------------------------------------------------*
2 Project: TwlSDK - GX - demos - UnitTours/2D_CharBg_3
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 $Date:: 2008-09-17#$
14 $Rev: 8556 $
15 $Author: okubata_ryoma $
16 *---------------------------------------------------------------------------*/
17
18 //---------------------------------------------------------------------------
19 // A sample that use BG #2 as affine mode(scaling):
20 //
21 // USAGE:
22 // UP, DOWN, LEFT, RIGHT : Change the center position of scaling
23 // A,B: Scaling 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 #define STANDARD_SIZE (1 << 8)
40
41 static u8 sScrnBuf[SCREEN_SIZE]; // Buffer for screen data (BG #2)
42
43 #ifdef SDK_TWL
TwlMain(void)44 void TwlMain(void)
45 #else
46 void NitroMain(void)
47 #endif
48 {
49 s16 x_0 = 0, y_0 = 0;
50 s16 x_1 = 0, y_1 = 0;
51
52 fx32 scale = 1 << FX32_SHIFT;
53
54 //---------------------------------------------------------------------------
55 // Initialize:
56 // Enables IRQ interrupts, initializes VRAM, and sets BG #2 for affine mode.
57 //---------------------------------------------------------------------------
58 DEMOInitCommon();
59 DEMOInitVRAM();
60 DEMOInitDisplayBG2Only();
61
62 //---------------------------------------------------------------------------
63 // Transmitting the character data and the palette data
64 //---------------------------------------------------------------------------
65 GX_LoadBG2Char(d_64_256_bg_schDT, 0, sizeof(d_64_256_bg_schDT));
66 GX_LoadBGPltt(d_64_256_bg_sclDT, 0, sizeof(d_64_256_bg_sclDT));
67
68 {
69 int i, j;
70 for (i = 0; i < 8; i++)
71 {
72 for (j = 0; j < 8; j++)
73 {
74 sScrnBuf[(i * 16) + j] = (u8)((i * 0x10) + j);
75 }
76 }
77 }
78 // Store the data in the main memory, and invalidate the cache.
79 DC_FlushRange(sScrnBuf, sizeof(sScrnBuf));
80 /* I/O register is accessed using DMA operation, so cache wait is not needed */
81 // DC_WaitWriteBufferEmpty();
82
83 // DMA Transfer to BG #2 screen
84 GX_LoadBG2Scr(sScrnBuf, 0, sizeof(sScrnBuf));
85
86 DEMOStartDisplay();
87 //---------------------------------------------------------------------------
88 // Main Loop
89 //---------------------------------------------------------------------------
90 while (1)
91 {
92 MtxFx22 mtx;
93 fx32 rScale;
94
95 DEMOReadKey();
96 if (DEMO_IS_PRESS(PAD_KEY_UP))
97 y_0 -= 2;
98 if (DEMO_IS_PRESS(PAD_KEY_DOWN))
99 y_0 += 2;
100 if (DEMO_IS_PRESS(PAD_KEY_RIGHT))
101 x_0 += 2;
102 if (DEMO_IS_PRESS(PAD_KEY_LEFT))
103 x_0 -= 2;
104 if (DEMO_IS_PRESS(PAD_BUTTON_A))
105 scale -= 2 << (FX32_SHIFT - 8);
106 if (DEMO_IS_PRESS(PAD_BUTTON_B))
107 scale += 2 << (FX32_SHIFT - 8);
108 if (DEMO_IS_TRIG(PAD_BUTTON_SELECT))
109 {
110 x_0 = 32;
111 y_0 = 32;
112 scale = 1 << FX32_SHIFT;
113 }
114
115 #ifdef SDK_AUTOTEST
116 x_0 = 10;
117 y_0 = 15;
118 scale = 8 << (FX32_SHIFT - 8); // default params for testing.
119 GX_SetBankForLCDC(GX_VRAM_LCDC_C);
120 EXT_TestSetVRAMForScreenShot(GX_VRAM_LCDC_C);
121 EXT_TestScreenShot(100, 0x3E71721B);
122 EXT_TestTickCounter();
123 #endif //SDK_AUTOTEST
124
125 scale = MATH_CLAMP(scale, 0x100, 0x3000);
126
127 rScale = FX_Inv(scale);
128 mtx._00 = rScale;
129 mtx._01 = 0;
130 mtx._10 = 0;
131 mtx._11 = rScale;
132
133
134 OS_WaitVBlankIntr(); // Waiting for the end of the VBlank interrupt
135
136 //---------------------------------------------------------------------------
137 // Set up affine transformation for BG #2
138 //---------------------------------------------------------------------------
139 G2_SetBG2Affine(&mtx, // a matrix for rotation and scaling
140 x_0, y_0, // the center of rotation
141 0, 0 // the reference point before rotation and scaling applied
142 );
143 }
144 }
145
146 //---------------------------------------------------------------------------
147 // VBlank interrupt function:
148 //
149 // Interrupt handlers are registered on the interrupt table by OS_SetIRQFunction.
150 // OS_EnableIrqMask selects IRQ interrupts to enable, and
151 // OS_EnableIrq enables IRQ interrupts.
152 // Notice that you have to call 'OS_SetIrqCheckFlag' to check a VBlank interrupt.
153 //---------------------------------------------------------------------------
VBlankIntr(void)154 void VBlankIntr(void)
155 {
156 OS_SetIrqCheckFlag(OS_IE_V_BLANK); // Checking VBlank interrupt
157 }
158