Quick note on how I add the HUD.
I added a method to fr.c to draw the background. Note that gDPSetRenderMode with NOOP is required to work on hardware. The parameters to GPACK_RGBA5551 set the background color used.
Gfx *viDrawHudBackground(Gfx *gdl)
{
s32 y = viGetViewTop();
s32 width = viGetX() - 3;
gDPPipeSync(gdl++);
/**
* Manual says:
* For fill mode and copy mode, please use g*DPSetRenderMode (G_RM_NOOP,G_RM_NOOP2). If you try to use the Z buffer with fill mode, the RDP pipeline might hang.
*/
gDPSetRenderMode(gdl++, G_RM_NOOP, G_RM_NOOP2);
gDPSetCycleType(gdl++, G_CYC_FILL);
gDPSetFillColor(gdl++, ((GPACK_RGBA5551(210, 210, 210, 1) << 16) | GPACK_RGBA5551(210, 210, 210, 1)));
gDPFillRectangle(
gdl++,
1,
y,
width,
y+10);
gDPPipeSync(gdl++);
return gdl;
}
In lvl.c I added a global variable
s32 g_RomHack_ShowHud = 0;
In lvlStageLoad I check if this is the title stage and enable/disable the flag:
if (stage == LEVELID_TITLE)
{
g_RomHack_ShowHud = 0;
init_menus_or_reset();
}
else
{
if (getPlayerCount() == 1)
{
g_RomHack_ShowHud = 1;
}
...
In lvlUnloadStageTextData I clear the HUD flag:
void lvlUnloadStageTextData(void)
{
g_RomHack_ShowHud = 0;
...
In the boss main loop I check for the flag. This code is inserted after the level is rendered, and before passing the gfx list to the RSP task for processing. Here's an example of how to write a text string to the HUD area. X and y coordinates are specified relative to the current screen view; text buffer used is char hud_text[100] declared at start of boss main.
Calling microcode_constructor is necessary before rendering text.
arg6 (0xff) is 32 bit rgba color of text, here r=0, g=0, b=0 since 0xff is 0x000000ff.
gdl = lvlRender(gdl);
if (g_RomHack_ShowHud)
{
s32 x = 4;
s32 y = viGetViewTop();
s32 width;
s32 height;
s32 vi_get_x = viGetX();
// draw HUD background rectangle
gdl = viDrawHudBackground(gdl);
// set render mode for writing text to screen
gdl = microcode_constructor(gdl);
height = y + 14; // same for all.
// Write foward/back speed
sprintf(hud_text, "^ %04.2f %c", g_CurrentPlayer->speedforwards, '\0');
width = vi_get_x - x - 2;
gdl = en_text_write_stuff(gdl, &x, &y, hud_text, ptrSecondFontTableSmall, ptrFirstFontTableSmall, 0xff, width, height, 0, 0);
...