Method text

src/world/gui.cpp:410–513

}

void Gui::text(const Vector3 &pos, u32 font_size, const char *str, StringId64 font, StringId64 material, const Color4 &color)
{
	const MaterialResource *mr = (MaterialResource *)_resource_manager->get(RESOURCE_TYPE_MATERIAL, material);
	_material_manager->create_material(mr);

	const FontResource *fr = (FontResource *)_resource_manager->get(RESOURCE_TYPE_FONT, font);
	const f32 scale = (f32)font_size / (f32)fr->font_size;

	VertexData *vd = (VertexData *)_buffer->vertex_buffer_end();
	u16 *id = (u16 *)_buffer->index_buffer_end();

	u32 num_vertices = 0;
	u32 num_indices = 0;

	u32 cp;
	u32 state = 0;
	f32 pen_x = 0.0f;
	f32 pen_y = 0.0f;
	const GlyphData deffault_glyph = {};

	for (const u8 *ch = (u8 *)str; *ch; ++ch) {
		if (utf8::decode(&state, &cp, *ch) != UTF8_ACCEPT)
			continue;

		if (cp == '\n') {
			pen_x = 0.0f;
			pen_y -= scale*fr->font_size;
			continue;
		} else if (cp == '\t') {
			pen_x += scale*font_size*4;
			continue;
		}

		const GlyphData *glyph = font_resource::glyph(fr, cp, &deffault_glyph);
		const f32 baseline = glyph->height - glyph->y_offset;
		const f32 x_offset = fsign(pen_x) * scale*glyph->x_offset;

		// Glyph position coords.
		const f32 x0 = pen_x + pos.x + x_offset;
		const f32 y0 = pen_y + pos.y - scale*baseline;
		const f32 x1 = fround(x0 + scale*glyph->width);
		const f32 y1 = fround(y0 + scale*glyph->height);

		pen_x += scale*glyph->x_advance;

		// Glyph atlas coords.
		const f32 u0 = glyph->x / fr->texture_size;
		const f32 v1 = glyph->y / fr->texture_size; // Upper-left char corner
		const f32 u1 = glyph->width  / fr->texture_size + u0;
		const f32 v0 = glyph->height / fr->texture_size + v1; // Bottom-left char corner

		const u32 abgr = to_abgr(color);

		// Fill vertex buffer.
		vd[0].pos.x = x0;
		vd[0].pos.y = y0;
		vd[0].pos.z = 0.0f;
		vd[0].uv.x  = u0;