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add slug vertex loading

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Matthew 2026-04-18 14:59:57 +10:00
parent ff0e689dd4
commit 6ae59dab5b
1 changed files with 76 additions and 4 deletions
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80
fonts.d
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@ -102,9 +102,9 @@ struct SlugVertex
{ {
Vec2 em_space_pos; Vec2 em_space_pos;
U16Vec2 glyph_data_coords; U16Vec2 glyph_data_coords;
struct max_bands struct
{ {
u8 x, pad, y, e; u8 max_bands_x, pad, max_bands_y, max_bands_e;
}; };
} }
}; };
@ -121,13 +121,20 @@ struct SlugVertex
Vec4 band; Vec4 band;
struct struct
{ {
Vec4 scale; Vec2 band_scale;
Vec4 offset; Vec2 band_offset;
}; };
}; };
Vec4 color; Vec4 color;
} }
struct SlugBuffer
{
SlugVertex[] vertices;
u32[] indices;
u32 quad_offset;
}
struct FontAtlas struct FontAtlas
{ {
Glyph[128] glyphs; Glyph[128] glyphs;
@ -818,3 +825,68 @@ SlugBuildBands(Arena* arena, u32 index, SlugFontInfo* font_info, u32 band_count)
} }
} }
} }
void
SlugLoadFontVertex(u8 ch, IVec2 pos, SlugFont* font, SlugBuffer* buffer)
{
ch = ch > 127 ? 0 : ch;
SlugGlyph* glyph = &font.glyphs[ch];
if(ch == ' ')
{
pos.x += cast(i32)(cast(f32)(glyph.advance) * font.scale);
}
else if(glyph.curve_count > 0)
{
Vec2 glyph_pos = Vec2(pos.x, pos.y);
Vec2 p0 = glyph_pos + glyph.rect.min * font.scale;
Vec2 p1 = glyph_pos + glyph.rect.max * font.scale;
u32 vertex_start = buffer.quad_offset*4;
u32 index_start = buffer.quad_offset*6;
SlugVertex[] vertices = buffer.vertices[vertex_start .. vertex_start+4];
u32[] indices = buffer.indices[index_start .. index_start+6];
const f32 NORMAL = 1.0;
f32 inv_scale = 1.0f/font.scale;
foreach(i; 0 .. 4)
{
vertices[i].band_scale = glyph.band_scale;
vertices[i].band_offset = glyph.band_offset;
vertices[i].glyph_data_coords = glyph.coords;
vertices[i].max_bands_x = glyph.max_bands.x;
vertices[i].max_bands_y = glyph.max_bands.y;
vertices[i].jac = Vec4(inv_scale, 0.0, 0.0, inv_scale);
vertices[i].color = 1.0;
}
vertices[0].vertex_coords = p0;
vertices[0].normal = Vec2(-NORMAL, +NORMAL);
vertices[0].em_space_pos = Vec2(glyph.rect.min.x, glyph.rect.max.y);
vertices[1].vertex_coords = Vec2(p0.x, p1.y);
vertices[1].normal = -NORMAL;
vertices[1].em_space_pos = glyph.rect.min;
vertices[2].vertex_coords = Vec2(p1.x, p0.y);
vertices[2].normal = +NORMAL;
vertices[2].em_space_pos = glyph.rect.max;
vertices[3].vertex_coords = p1;
vertices[3].normal = Vec2(+NORMAL, -NORMAL);
vertices[3].em_space_pos = Vec2(glyph.rect.max.x, glyph.rect.min.y);
u32 vidx = vertex_start;
indices[0 .. 6] = [vidx+0, vidx+2, vidx+3, vidx+3, vidx+1, vidx+0];
buffer.quad_offset += 1;
pos.x += cast(i32)(cast(f32)(glyph.advance) * font.scale);
}
}