Developer tips
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Contents |
General Programming Tips
- Keep your code commented throughout; it helps others help you.
- Any unused code should be deleted out of the program, unless it is a program for teaching people.
- If someone does the same thing in a more efficient way (i.e. faster and/or in less code), accept it and learn from it.
- It is a good idea to release your app open source so others can learn from your code.
- To keep things tidy, make your application store files in the data folder on the root of the SD card (fat0:\data\XXXXX, where XXXXX is the name of your app).
Code Snippets
Video Auto-Detect Routine
The libogc included in DevkitPPC r15 does this for you with one function call. Here is the video detect code from the DevKitPro Wii example.
#include <gccore.h> static GXRModeObj *rmode = NULL; // ... rmode = VIDEO_GetPreferredMode(NULL); if( CONF_GetAspectRatio() ) { rmode->viWidth = 678; rmode->viXOrigin = (VI_MAX_WIDTH_PAL - 678)/2; } VIDEO_Configure(rmode);
Please see also: Display Issues
Exit to Loader
It's a good idea to add some way to return to the loader, otherwise you have to reboot your Wii to exit.
// Just call the exit() function to go back to the loader // Returning from main also works, since that calls exit for you #include <stdlib.h> // ... exit(0);
How to use the Wiimote
A separate article is available: How to use the Wiimote.
Reboot Wii
Use:
#include <gccore.h> // ... SYS_ResetSystem(SYS_RESTART,0,0);
Or use SYS_RETURNTOMENU for a "soft" return to the system menu, SYS_POWEROFF to shut down the wii (automatically to the appropriate Idle or Standby mode, depending on the WC24 setting), or SYS_POWEROFF_STANDBY or _IDLE to specify the mode and override the system setting.
How to use the callback function for Power and Reset
This is just a way of doing this stuff, feel free to change the code.
u8 HWButton = 0; /** * Callback for the reset button on the Wii. */ void WiiResetPressed() { HWButton = SYS_RETURNTOMENU; } /** * Callback for the power button on the Wii. */ void WiiPowerPressed() { HWButton = SYS_POWEROFF_STANDBY; } /** * Callback for the power button on the Wiimote. * @param[in] chan The Wiimote that pressed the button */ void WiimotePowerPressed(s32 chan) { HWButton = SYS_POWEROFF_STANDBY; } /** * Entry point. * @param[in] argc The number of arguments invoked with the program * @param[in] argv The array containing the arguments * @return 0 on clean exit, an error code otherwise */ int main(int argc, char **argv) { // Initialization SYS_SetResetCallback(WiiResetPressed); SYS_SetPowerCallback(WiiPowerPressed); WPAD_SetPowerButtonCallback(WiimotePowerPressed); while(1) { // Do Stuff Here if(HWButton) break; } if(HWButton) { SYS_ResetSystem(HWButton, 0, 0); } return 0; }
