Martino Ferrari
3ff7b9c978
Review of the atlas refactor found one Important and three Minor issues: - Important: TextAtlas::sync called glGetIntegerv before any available() check, so a host that synced before plot::gl::load() -- which is legal for a public class Tasks 2 and 8 build backends on -- segfaulted on a null entry point instead of receiving the Status the interface promises. It now follows the handle-constructor convention (available(), then the entry point itself) and reports Unsupported. - empty() no longer means "a GL name exists": releasing one is a glDeleteTextures call, so the no-atlas path forgets the atlas and only resets the texture when there is a table to release it with. - end_frame's comment still claimed the frame hands back the unpack alignment init() set, contradicting the code below it and renderer.hpp. - The orientation case's texel probe mapped the atlas' u along the cell's +v axis and vice versa, which is a no-op for its two diagonal probes -- so it could not fail on a transposed UV mapping, and its own comment misstated the rule. Probes now follow the shader's rule and include an off-diagonal pair. - The null-glyph path of add_text (and its twin in walk_text_clipped) was unreached by any case. Cases: text_atlas_reports_a_status_when_the_entry_points_are_missing, add_text_skips_a_codepoint_the_backend_cannot_draw.