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#1 2009-09-05 02:24:39
- BlueChip
- Moderator
Drop Shadows
My font routine is nearing completion.
The font format supported is the same used by several big-name games companies, including (the) CodeMasters and the font generator is free as in, "you get the app, not the source code"
The print routines include support for:
# Multiple font support (limited by RAM)
# Full unicode support
# Binary search algorithm for speed
# Stateful screen coordinates [just for you, Xane]
# Print or do-not-print half-characters (ie. when part of the character is off-screen)
# Support for '\n'
# Auto-CRLF (when EOL is reached)
# Print strings* (which may include '\n')
# Tracking
# Leading [led'ing, not lee'ding]
* I have deliberately chosen not to implement printf() due to memory considerations ...use snprintf() yourself 
ToDo List:
# Text Alignment [it will happen soon, I need it for my game]
The last thing (well, the /next/ "last thing) I want to do before releasing this code is add a drop shadow option.
The way I want to this is thus: Display the character, but reduce every colour to black & multiply the opacity by {0 < N <= 1.0}
I really think I should be able to do this by applying some terribly clever matrix (or such) with a GX_foo() call
But I really have no idea even where to start looking.
Please Help
Final Note.
I know that others are also working on font routines to add to GRRLIB ...When I release my code I am happy for it to go in to GRRLIB, and I am also happy to release it as a separate library - I will not be offended either way 
BC
Last edited by BlueChip (2009-09-05 02:37:12)
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#2 2009-09-05 03:11:14
- elisherer
- Member
Re: Drop Shadows
Does it rely on freetype?
and if not...make sure it stays under 2MB cause freetype is the largest lib today!!!
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#3 2009-09-05 03:28:41
- BlueChip
- Moderator
Re: Drop Shadows
Does it rely on freetype?
and if not...make sure it stays under 2MB cause freetype is the largest lib today!!!
No! This supports full-colour w/ alpha fonts generated with BMFGenerator from AngelCode
I've not compiled to .a yet, but the .o (with every function inside it) comes in a just under 8K
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#4 2009-09-05 04:19:15
- BlueChip
- Moderator
Re: Drop Shadows
Problem resolved thanks to comex & rewt on #wiidev @ efnet
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#5 2009-09-05 10:57:37
- JustWoody
- Member
Re: Drop Shadows
Why not just draw the shadow by drawing the character with a colour like 0x77222222 (if using 0xaarrggbb format)?
I would imagine that this should look the part
You may have to modify the drawing routine to support specify colour to this detail
Not sure if you have thought about it, but you might want to be able to user specify x and y offsets of the shadow and maybe allow for changeable shadow scale to try to give depth
Last edited by JustWoody (2009-09-05 11:01:47)
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#6 2009-09-05 21:02:34
- BlueChip
- Moderator
Re: Drop Shadows
Thanks Woody - that's almost exactly what I did in the end
BMF_shadow(font, x_offset, y_offset, alpha_level); // configure font shadow
...When I have time I will look at doing the alpha as a percentage of the alpha of the character ...but I need to spend more time with the TEV documentation
Code:
void BMF_drawc (f32 x, f32 y, const BMF_Font* font, const BMF_Char* chr)
{
GXTexObj texObj;
Mtx m, m1, m2, mv;
GX_InitTexObj(&texObj, font->tex->data, font->tex->w, font->tex->h,
GX_TF_RGBA8, GX_CLAMP, GX_CLAMP, GX_FALSE);
if (GRRLIB_Settings.antialias == false)
GX_InitTexObjLOD(&texObj, GX_NEAR, GX_NEAR,
0.0f, 0.0f, 0.0f, 0, 0, GX_ANISO_1);
GX_LoadTexObj(&texObj, GX_TEXMAP0);
GX_SetTevOp (GX_TEVSTAGE0, GX_MODULATE);
GX_SetVtxDesc(GX_VA_TEX0, GX_DIRECT);
guMtxIdentity (m1);
guMtxScaleApply(m1, m1, 1.0f, 1.0f, 1.0f);
guMtxRotAxisDeg(m2, &axis, 0.0f);
guMtxConcat (m2, m1, m);
guMtxConcat (GXmodelView2D, m, mv);
x += chr->xoff;
y += chr->yoff;
if (font->shadow) {
x += font->shad_x;
y += font->shad_y;
GX_LoadPosMtxImm(mv, GX_PNMTX0);
GX_Begin(GX_QUADS, GX_VTXFMT0, 4);
GX_Position3f32(x, y, 0);
GX_Color1u32 (font->shad_a);
GX_TexCoord2f32(chr->idx[BMF_TL].x, chr->idx[BMF_TL].y);
GX_Position3f32(x +chr->w, y, 0);
GX_Color1u32 (font->shad_a);
GX_TexCoord2f32(chr->idx[BMF_TR].x, chr->idx[BMF_TR].y);
GX_Position3f32(x +chr->w, y +chr->h, 0);
GX_Color1u32 (font->shad_a);
GX_TexCoord2f32(chr->idx[BMF_BR].x, chr->idx[BMF_BR].y);
GX_Position3f32(x, y +chr->h, 0);
GX_Color1u32 (font->shad_a);
GX_TexCoord2f32(chr->idx[BMF_BL].x, chr->idx[BMF_BL].y);
GX_End();
x -= font->shad_x;
y -= font->shad_y;
}
GX_Begin(GX_QUADS, GX_VTXFMT0, 4);
GX_Position3f32(x, y, 0);
GX_Color1u32 (0xFFFFFFFF);
GX_TexCoord2f32(chr->idx[BMF_TL].x, chr->idx[BMF_TL].y);
GX_Position3f32(x +chr->w, y, 0);
GX_Color1u32 (0xFFFFFFFF);
GX_TexCoord2f32(chr->idx[BMF_TR].x, chr->idx[BMF_TR].y);
GX_Position3f32(x +chr->w, y +chr->h, 0);
GX_Color1u32 (0xFFFFFFFF);
GX_TexCoord2f32(chr->idx[BMF_BR].x, chr->idx[BMF_BR].y);
GX_Position3f32(x, y +chr->h, 0);
GX_Color1u32 (0xFFFFFFFF);
GX_TexCoord2f32(chr->idx[BMF_BL].x, chr->idx[BMF_BL].y);
GX_End();
GX_LoadPosMtxImm(GXmodelView2D, GX_PNMTX0);
GX_SetTevOp (GX_TEVSTAGE0, GX_PASSCLR);
GX_SetVtxDesc(GX_VA_TEX0, GX_NONE);
}all improvements welcome
BC
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