106 lines
2.6 KiB
Plaintext
106 lines
2.6 KiB
Plaintext
Font_Handle :: #type, distinct u32;
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Glyph :: struct {
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ax: float; // advance.x
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ay: float; // advance.y
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bw: float; // bitmap.width;
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bh: float; // bitmap.rows;
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bl: float; // bitmap_left;
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bt: float; // bitmap_top;
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tx: float; // x offset of glyph in texture coordinates
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}
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Point :: struct {
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x: float;
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y: float;
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s: float;
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t: float;
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color: Vector4;
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};
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Font :: struct {
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glyphs: [..] Glyph;
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face: FT_Face;
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pixel_size: u32;
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atlas_width: u32;
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atlas_height: u32;
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texture: Texture_Handle;
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}
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ft : FT_Library;
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init_freetype :: () {
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if FT_Init_FreeType(*ft) {
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log("Couldn't init Freetype\n");
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}
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}
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create_font :: (renderer: *Renderer, path: string, pixel_size: u32) -> Font_Handle {
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font: Font;
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font.pixel_size = pixel_size;
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array_resize(*font.glyphs, 128);
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if FT_New_Face(ft, path.data, 0, *font.face) {
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log("Couldn't create new face\n");
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assert(false);
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} else {
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FT_Set_Pixel_Sizes(font.face, 0, pixel_size);
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g := font.face.glyph;
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w : u32 = 0;
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h : u32 = 0;
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index := 0;
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for 32..128-1 {
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if FT_Load_Char(font.face, xx it, FT_LOAD_RENDER) {
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continue;
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}
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w += g.bitmap.width + 1;
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h = max(h, g.bitmap.rows);
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}
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atlas_width := w;
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bytes : [..] u8;
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bytes.allocator = temp;
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array_resize(*bytes, w * h);
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texture := create_texture(renderer, bytes.data, w, h, 1, generate_mips=false, format=.R8_UNORM);
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font.atlas_width = w;
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font.atlas_height = h;
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font.texture = texture;
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x : u32 = 0;
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pixel_width := 1.0 / cast(float)atlas_width;
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for 32..128-1 {
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if FT_Load_Char(font.face, xx it, FT_LOAD_RENDER) continue;
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// @Speed: We should put this buffer data into an array and upload everything once after this loop
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update_texture_region(renderer, texture, x, 0, g.bitmap.width, g.bitmap.rows, 1, g.bitmap.buffer);
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font.glyphs[it].ax = cast(float)(g.advance.x >> 6);
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font.glyphs[it].ay = cast(float)(g.advance.y >> 6);
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font.glyphs[it].bw = cast(float)g.bitmap.width;
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font.glyphs[it].bh = cast(float)g.bitmap.rows;
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font.glyphs[it].bl = cast(float)g.bitmap_left;
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font.glyphs[it].bt = cast(float)g.bitmap_top;
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font.glyphs[it].tx = cast(float)x / cast(float)w;
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x += g.bitmap.width + 1;
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}
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array_add(*engine.renderer.fonts, font);
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return xx engine.renderer.fonts.count;
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}
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return 0;
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}
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#import "freetype-2.12.1";
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