minor reorganization
This commit is contained in:
@@ -24,6 +24,7 @@ TODO Additional Features:
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* Support for harfbuzz
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* Ability to set a draw transform, viewport and projection
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* By default the library's position is in unsigned normalized render space
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* Allow curve_quality to be set on a per-font basis
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TODO Optimizations:
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@@ -13,47 +13,24 @@ Changes:
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package VEFontCache
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import "base:runtime"
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import "core:math"
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import "core:mem"
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Advance_Snap_Smallfont_Size :: 12
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FontID :: distinct i64
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Glyph :: distinct i32
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Colour :: [4]f32
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Vec2 :: [2]f32
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Vec2i :: [2]i32
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vec2_from_scalar :: proc( scalar : f32 ) -> Vec2 { return { scalar, scalar } }
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AtlasRegionKind :: enum u8 {
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None = 0x00,
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A = 0x41,
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B = 0x42,
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C = 0x43,
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D = 0x44,
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E = 0x45,
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Ignore = 0xFF, // ve_fontcache_cache_glyph_to_atlas uses a -1 value in clear draw call
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}
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FontID :: distinct i64
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Glyph :: distinct i32
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Vertex :: struct {
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pos : Vec2,
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u, v : f32,
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}
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ShapedText :: struct {
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glyphs : Array(Glyph),
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positions : Array(Vec2),
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end_cursor_pos : Vec2,
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}
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ShapedTextCache :: struct {
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storage : Array(ShapedText),
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state : LRU_Cache,
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next_cache_id : i32,
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}
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Entry :: struct {
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parser_info : ParserFontInfo,
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shaper_info : ShaperInfo,
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@@ -100,82 +77,7 @@ Context :: struct {
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debug_print_verbose : b32,
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}
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get_cursor_pos :: proc( ctx : ^Context ) -> Vec2 { return ctx.cursor_pos }
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set_colour :: proc( ctx : ^Context, colour : Colour ) { ctx.colour = colour }
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font_glyph_lru_code :: #force_inline proc( font : FontID, glyph_index : Glyph ) -> (lru_code : u64)
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{
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// font := font
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// glyph_index := glyph_index
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// font_bytes := slice_ptr( transmute(^byte) & font, size_of(FontID) )
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// glyph_bytes := slice_ptr( transmute(^byte) & glyph_index, size_of(Glyph) )
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// buffer : [32]byte
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// copy( buffer[:], font_bytes )
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// copy( buffer[ len(font_bytes) :], glyph_bytes )
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// hash := fnv64a( transmute([]byte) buffer[: size_of(FontID) + size_of(Glyph) ] )
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// lru_code = hash
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lru_code = u64(glyph_index) + ( ( 0x100000000 * u64(font) ) & 0xFFFFFFFF00000000 )
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return
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}
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label_hash :: #force_inline proc( label : string ) -> u64 {
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hash : u64
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for str_byte in transmute([]byte) label {
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hash = ((hash << 8) + hash) + u64(str_byte)
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}
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return hash
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}
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// For a provided alpha value,
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// allows the function to calculate the position of a point along the curve at any given fraction of its total length
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// ve_fontcache_eval_bezier (quadratic)
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eval_point_on_bezier3 :: proc( p0, p1, p2 : Vec2, alpha : f32 ) -> Vec2
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{
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weight_start := (1 - alpha) * (1 - alpha)
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weight_control := 2.0 * (1 - alpha) * alpha
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weight_end := alpha * alpha
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starting_point := p0 * weight_start
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control_point := p1 * weight_control
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end_point := p2 * weight_end
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point := starting_point + control_point + end_point
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return point
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}
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// For a provided alpha value,
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// allows the function to calculate the position of a point along the curve at any given fraction of its total length
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// ve_fontcache_eval_bezier (cubic)
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eval_point_on_bezier4 :: proc( p0, p1, p2, p3 : Vec2, alpha : f32 ) -> Vec2
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{
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weight_start := (1 - alpha) * (1 - alpha) * (1 - alpha)
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weight_c_a := 3 * (1 - alpha) * (1 - alpha) * alpha
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weight_c_b := 3 * (1 - alpha) * alpha * alpha
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weight_end := alpha * alpha * alpha
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start_point := p0 * weight_start
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control_a := p1 * weight_c_a
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control_b := p2 * weight_c_b
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end_point := p3 * weight_end
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point := start_point + control_a + control_b + end_point
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return point
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}
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screenspace_x_form :: proc( position, scale : ^Vec2, width, height : f32 ) {
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quotient := 1.0 / Vec2 { width, height }
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(position^) = (position^) * quotient * 2.0 - 1.0
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(scale^) = (scale^) * quotient * 2.0
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}
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textspace_x_form :: proc( position, scale : ^Vec2, width, height : f32 ) {
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quotient := 1.0 / Vec2 { width, height }
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(position^) *= quotient
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(scale^) *= quotient
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}
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#region("lifetime")
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InitAtlasRegionParams :: struct {
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width : u32,
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@@ -223,7 +125,7 @@ InitGlyphDrawParams :: struct {
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}
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InitGlyphDrawParams_Default :: InitGlyphDrawParams {
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over_sample = { 4, 4 },
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over_sample = { 8, 8 },
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buffer_batch = 4,
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draw_padding = InitAtlasParams_Default.glyph_padding,
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}
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@@ -244,7 +146,7 @@ init :: proc( ctx : ^Context, parser_kind : ParserKind,
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atlas_params := InitAtlasParams_Default,
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glyph_draw_params := InitGlyphDrawParams_Default,
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shape_cache_params := InitShapeCacheParams_Default,
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curve_quality : u32 = 6,
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curve_quality : u32 = 12,
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entires_reserve : u32 = Kilobyte,
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temp_path_reserve : u32 = Kilobyte,
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temp_codepoint_seen_reserve : u32 = 512,
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@@ -420,6 +322,8 @@ shutdown :: proc( ctx : ^Context )
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shaper_shutdown( & shaper_ctx )
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}
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#endregion("lifetime")
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// ve_fontcache_configure_snap
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configure_snap :: proc( ctx : ^Context, snap_width, snap_height : u32 ) {
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assert( ctx != nil )
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@@ -709,8 +613,8 @@ cache_glyph_to_atlas :: proc( ctx : ^Context, font : FontID, glyph_index : Glyph
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{
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// Queue up clear on target region on atlas
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using call
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pass = .Atlas
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region = .Ignore
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pass = .Atlas
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region = .Ignore
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start_index = u32(atlas.clear_draw_list.indices.num)
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blit_quad( & atlas.clear_draw_list, dst_position, dst_position + dst_size, { 1.0, 1.0 }, { 1.0, 1.0 } )
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end_index = u32(atlas.clear_draw_list.indices.num)
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@@ -728,6 +632,9 @@ cache_glyph_to_atlas :: proc( ctx : ^Context, font : FontID, glyph_index : Glyph
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cache_glyph( ctx, font, glyph_index, glyph_draw_scale, glyph_draw_translate )
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}
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get_cursor_pos :: proc( ctx : ^Context ) -> Vec2 { return ctx.cursor_pos }
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set_colour :: proc( ctx : ^Context, colour : Colour ) { ctx.colour = colour }
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is_empty :: proc( ctx : ^Context, entry : ^Entry, glyph_index : Glyph ) -> b32
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{
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if glyph_index == 0 do return true
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@@ -742,14 +649,11 @@ measure_text_size :: proc( ctx : ^Context, font : FontID, text_utf8 : string ) -
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context.allocator = ctx.backing
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atlas := ctx.atlas
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shaped := shape_text_cached( ctx, font, text_utf8 )
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entry := & ctx.entries.data[ font ]
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atlas := ctx.atlas
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shaped := shape_text_cached( ctx, font, text_utf8 )
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entry := & ctx.entries.data[ font ]
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padding := 2 * cast(f32) atlas.glyph_padding
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batch_start_idx : i32 = 0
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for index : i32 = 0; index < i32(shaped.glyphs.num); index += 1
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{
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glyph_index := shaped.glyphs.data[ index ]
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@@ -773,121 +677,3 @@ measure_text_size :: proc( ctx : ^Context, font : FontID, text_utf8 : string ) -
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return measured
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}
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reset_batch_codepoint_state :: proc( ctx : ^Context ) {
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clear( & ctx.temp_codepoint_seen )
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ctx.temp_codepoint_seen_num = 0
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}
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shape_text_cached :: proc( ctx : ^Context, font : FontID, text_utf8 : string ) -> ^ShapedText
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{
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@static buffer : [64 * Kilobyte]byte
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font := font
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buffer_slice := buffer[:]
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font_bytes := slice_ptr( transmute(^byte) & font, size_of(FontID) )
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copy( buffer_slice, font_bytes )
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text_bytes := transmute( []byte) text_utf8
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buffer_slice_post_font := buffer[size_of(FontID) : size_of(FontID) + len(text_utf8) ]
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copy( buffer_slice_post_font, text_bytes )
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hash := label_hash( transmute(string) buffer[: size_of(FontID) + len(text_utf8)] )
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shape_cache := & ctx.shape_cache
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state := & ctx.shape_cache.state
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shape_cache_idx := LRU_get( state, hash )
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if shape_cache_idx == -1
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{
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if shape_cache.next_cache_id < i32(state.capacity) {
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shape_cache_idx = shape_cache.next_cache_id
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shape_cache.next_cache_id += 1
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evicted := LRU_put( state, hash, shape_cache_idx )
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assert( evicted == hash )
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}
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else
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{
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next_evict_idx := LRU_get_next_evicted( state )
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assert( next_evict_idx != 0xFFFFFFFFFFFFFFFF )
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shape_cache_idx = LRU_peek( state, next_evict_idx, must_find = true )
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assert( shape_cache_idx != - 1 )
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LRU_put( state, hash, shape_cache_idx )
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}
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shape_text_uncached( ctx, font, & shape_cache.storage.data[ shape_cache_idx ], text_utf8 )
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}
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return & shape_cache.storage.data[ shape_cache_idx ]
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}
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shape_text_uncached :: proc( ctx : ^Context, font : FontID, output : ^ShapedText, text_utf8 : string )
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{
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assert( ctx != nil )
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assert( font >= 0 && font < FontID(ctx.entries.num) )
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use_full_text_shape := ctx.text_shape_adv
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entry := & ctx.entries.data[ font ]
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clear( output.glyphs )
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clear( output.positions )
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ascent, descent, line_gap := parser_get_font_vertical_metrics( & entry.parser_info )
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if use_full_text_shape
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{
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// assert( entry.shaper_info != nil )
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shaper_shape_from_text( & ctx.shaper_ctx, & entry.shaper_info, output, text_utf8, ascent, descent, line_gap, entry.size, entry.size_scale )
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return
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}
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else
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{
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ascent := f32(ascent)
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descent := f32(descent)
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line_gap := f32(line_gap)
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// Note(Original Author):
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// We use our own fallback dumbass text shaping.
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// WARNING: PLEASE USE HARFBUZZ. GOOD TEXT SHAPING IS IMPORTANT FOR INTERNATIONALISATION.
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position : Vec2
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advance : i32 = 0
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to_left_side_glyph : i32 = 0
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prev_codepoint : rune
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for codepoint in text_utf8
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{
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if prev_codepoint > 0 {
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kern := parser_get_codepoint_kern_advance( & entry.parser_info, prev_codepoint, codepoint )
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position.x += f32(kern) * entry.size_scale
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}
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if codepoint == '\n'
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{
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position.x = 0.0
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position.y -= (ascent - descent + line_gap) * entry.size_scale
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position.y = cast(f32) i32( position.y + 0.5 )
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prev_codepoint = rune(0)
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continue
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}
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if math.abs( entry.size ) <= Advance_Snap_Smallfont_Size {
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position.x = math.ceil( position.x )
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}
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append( & output.glyphs, parser_find_glyph_index( & entry.parser_info, codepoint ))
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advance, to_left_side_glyph = parser_get_codepoint_horizontal_metrics( & entry.parser_info, codepoint )
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append( & output.positions, Vec2 {
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cast(f32) i32(position.x + 0.5),
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position.y
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})
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position.x += f32(advance) * entry.size_scale
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prev_codepoint = codepoint
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}
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output.end_cursor_pos = position
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}
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}
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@@ -1,5 +1,15 @@
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package VEFontCache
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AtlasRegionKind :: enum u8 {
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None = 0x00,
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A = 0x41,
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B = 0x42,
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C = 0x43,
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D = 0x44,
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E = 0x45,
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Ignore = 0xFF, // ve_fontcache_cache_glyph_to_atlas uses a -1 value in clear draw call
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}
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AtlasRegion :: struct {
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state : LRU_Cache,
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7
code/font/VEFontCache/docs/Readme.md
Normal file
7
code/font/VEFontCache/docs/Readme.md
Normal file
@@ -0,0 +1,7 @@
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# Documentation
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Work in progress...
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@@ -400,6 +400,20 @@ draw_text :: proc( ctx : ^Context, font : FontID, text_utf8 : string, position :
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return true
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}
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draw_text_batch :: proc( ctx : ^Context, entry : ^Entry, shaped : ^ShapedText, batch_start_idx, batch_end_idx : i32, position, scale : Vec2 )
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{
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flush_glyph_buffer_to_atlas( ctx )
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for index := batch_start_idx; index < batch_end_idx; index += 1
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{
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glyph_index := shaped.glyphs.data[ index ]
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shaped_position := shaped.positions.data[index]
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glyph_translate := position + shaped_position * scale
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glyph_cached := draw_cached_glyph( ctx, entry, glyph_index, glyph_translate, scale)
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assert( glyph_cached == true )
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}
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}
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// Helper for draw_text, all raw text content should be confirmed to be either formatting or visible shapes before getting cached.
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draw_text_shape :: proc( ctx : ^Context, font : FontID, entry : ^Entry, shaped : ^ShapedText, position, scale : Vec2, snap_width, snap_height : f32 ) -> (cursor_pos : Vec2)
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{
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@@ -429,19 +443,6 @@ draw_text_shape :: proc( ctx : ^Context, font : FontID, entry : ^Entry, shaped :
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return
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}
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draw_text_batch :: proc( ctx : ^Context, entry : ^Entry, shaped : ^ShapedText, batch_start_idx, batch_end_idx : i32, position, scale : Vec2 )
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{
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flush_glyph_buffer_to_atlas( ctx )
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for index := batch_start_idx; index < batch_end_idx; index += 1
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{
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glyph_index := shaped.glyphs.data[ index ]
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shaped_position := shaped.positions.data[index]
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glyph_translate := position + shaped_position * scale
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glyph_cached := draw_cached_glyph( ctx, entry, glyph_index, glyph_translate, scale)
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assert( glyph_cached == true )
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}
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}
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// ve_fontcache_flush_drawlist
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flush_draw_list :: proc( ctx : ^Context ) {
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assert( ctx != nil )
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@@ -137,4 +137,8 @@ underlying_slice :: proc {
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array_underlying_slice,
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}
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vec2 :: proc {
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vec2_from_scalar,
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}
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//#endregion("Proc overload mappings")
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80
code/font/VEFontCache/misc.odin
Normal file
80
code/font/VEFontCache/misc.odin
Normal file
@@ -0,0 +1,80 @@
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package VEFontCache
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font_glyph_lru_code :: #force_inline proc( font : FontID, glyph_index : Glyph ) -> (lru_code : u64)
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{
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// font := font
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// glyph_index := glyph_index
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// font_bytes := slice_ptr( transmute(^byte) & font, size_of(FontID) )
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// glyph_bytes := slice_ptr( transmute(^byte) & glyph_index, size_of(Glyph) )
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// buffer : [32]byte
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// copy( buffer[:], font_bytes )
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// copy( buffer[ len(font_bytes) :], glyph_bytes )
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// hash := fnv64a( transmute([]byte) buffer[: size_of(FontID) + size_of(Glyph) ] )
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// lru_code = hash
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lru_code = u64(glyph_index) + ( ( 0x100000000 * u64(font) ) & 0xFFFFFFFF00000000 )
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return
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}
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||||
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shape_lru_hash :: #force_inline proc( label : string ) -> u64 {
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||||
hash : u64
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||||
for str_byte in transmute([]byte) label {
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||||
hash = ((hash << 8) + hash) + u64(str_byte)
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||||
}
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||||
return hash
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||||
}
|
||||
|
||||
// For a provided alpha value,
|
||||
// allows the function to calculate the position of a point along the curve at any given fraction of its total length
|
||||
// ve_fontcache_eval_bezier (quadratic)
|
||||
eval_point_on_bezier3 :: proc( p0, p1, p2 : Vec2, alpha : f32 ) -> Vec2
|
||||
{
|
||||
weight_start := (1 - alpha) * (1 - alpha)
|
||||
weight_control := 2.0 * (1 - alpha) * alpha
|
||||
weight_end := alpha * alpha
|
||||
|
||||
starting_point := p0 * weight_start
|
||||
control_point := p1 * weight_control
|
||||
end_point := p2 * weight_end
|
||||
|
||||
point := starting_point + control_point + end_point
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||||
return point
|
||||
}
|
||||
|
||||
// For a provided alpha value,
|
||||
// allows the function to calculate the position of a point along the curve at any given fraction of its total length
|
||||
// ve_fontcache_eval_bezier (cubic)
|
||||
eval_point_on_bezier4 :: proc( p0, p1, p2, p3 : Vec2, alpha : f32 ) -> Vec2
|
||||
{
|
||||
weight_start := (1 - alpha) * (1 - alpha) * (1 - alpha)
|
||||
weight_c_a := 3 * (1 - alpha) * (1 - alpha) * alpha
|
||||
weight_c_b := 3 * (1 - alpha) * alpha * alpha
|
||||
weight_end := alpha * alpha * alpha
|
||||
|
||||
start_point := p0 * weight_start
|
||||
control_a := p1 * weight_c_a
|
||||
control_b := p2 * weight_c_b
|
||||
end_point := p3 * weight_end
|
||||
|
||||
point := start_point + control_a + control_b + end_point
|
||||
return point
|
||||
}
|
||||
|
||||
reset_batch_codepoint_state :: proc( ctx : ^Context ) {
|
||||
clear( & ctx.temp_codepoint_seen )
|
||||
ctx.temp_codepoint_seen_num = 0
|
||||
}
|
||||
|
||||
screenspace_x_form :: proc( position, scale : ^Vec2, width, height : f32 ) {
|
||||
quotient := 1.0 / Vec2 { width, height }
|
||||
(position^) = (position^) * quotient * 2.0 - 1.0
|
||||
(scale^) = (scale^) * quotient * 2.0
|
||||
}
|
||||
|
||||
textspace_x_form :: proc( position, scale : ^Vec2, width, height : f32 ) {
|
||||
quotient := 1.0 / Vec2 { width, height }
|
||||
(position^) *= quotient
|
||||
(scale^) *= quotient
|
||||
}
|
||||
127
code/font/VEFontCache/shaped_text.odin
Normal file
127
code/font/VEFontCache/shaped_text.odin
Normal file
@@ -0,0 +1,127 @@
|
||||
package VEFontCache
|
||||
|
||||
import "core:math"
|
||||
|
||||
ShapedText :: struct {
|
||||
glyphs : Array(Glyph),
|
||||
positions : Array(Vec2),
|
||||
end_cursor_pos : Vec2,
|
||||
}
|
||||
|
||||
ShapedTextCache :: struct {
|
||||
storage : Array(ShapedText),
|
||||
state : LRU_Cache,
|
||||
next_cache_id : i32,
|
||||
}
|
||||
|
||||
shape_text_cached :: proc( ctx : ^Context, font : FontID, text_utf8 : string ) -> ^ShapedText
|
||||
{
|
||||
@static buffer : [64 * Kilobyte]byte
|
||||
|
||||
font := font
|
||||
|
||||
buffer_slice := buffer[:]
|
||||
font_bytes := slice_ptr( transmute(^byte) & font, size_of(FontID) )
|
||||
copy( buffer_slice, font_bytes )
|
||||
|
||||
text_bytes := transmute( []byte) text_utf8
|
||||
buffer_slice_post_font := buffer[size_of(FontID) : size_of(FontID) + len(text_utf8) ]
|
||||
copy( buffer_slice_post_font, text_bytes )
|
||||
|
||||
hash := shape_lru_hash( transmute(string) buffer[: size_of(FontID) + len(text_utf8)] )
|
||||
|
||||
shape_cache := & ctx.shape_cache
|
||||
state := & ctx.shape_cache.state
|
||||
|
||||
shape_cache_idx := LRU_get( state, hash )
|
||||
if shape_cache_idx == -1
|
||||
{
|
||||
if shape_cache.next_cache_id < i32(state.capacity) {
|
||||
shape_cache_idx = shape_cache.next_cache_id
|
||||
shape_cache.next_cache_id += 1
|
||||
evicted := LRU_put( state, hash, shape_cache_idx )
|
||||
assert( evicted == hash )
|
||||
}
|
||||
else
|
||||
{
|
||||
next_evict_idx := LRU_get_next_evicted( state )
|
||||
assert( next_evict_idx != 0xFFFFFFFFFFFFFFFF )
|
||||
|
||||
shape_cache_idx = LRU_peek( state, next_evict_idx, must_find = true )
|
||||
assert( shape_cache_idx != - 1 )
|
||||
|
||||
LRU_put( state, hash, shape_cache_idx )
|
||||
}
|
||||
|
||||
shape_text_uncached( ctx, font, & shape_cache.storage.data[ shape_cache_idx ], text_utf8 )
|
||||
}
|
||||
|
||||
return & shape_cache.storage.data[ shape_cache_idx ]
|
||||
}
|
||||
|
||||
shape_text_uncached :: proc( ctx : ^Context, font : FontID, output : ^ShapedText, text_utf8 : string )
|
||||
{
|
||||
assert( ctx != nil )
|
||||
assert( font >= 0 && font < FontID(ctx.entries.num) )
|
||||
|
||||
use_full_text_shape := ctx.text_shape_adv
|
||||
entry := & ctx.entries.data[ font ]
|
||||
|
||||
clear( output.glyphs )
|
||||
clear( output.positions )
|
||||
|
||||
ascent, descent, line_gap := parser_get_font_vertical_metrics( & entry.parser_info )
|
||||
|
||||
if use_full_text_shape
|
||||
{
|
||||
// assert( entry.shaper_info != nil )
|
||||
shaper_shape_from_text( & ctx.shaper_ctx, & entry.shaper_info, output, text_utf8, ascent, descent, line_gap, entry.size, entry.size_scale )
|
||||
return
|
||||
}
|
||||
else
|
||||
{
|
||||
// Note(Original Author):
|
||||
// We use our own fallback dumbass text shaping.
|
||||
// WARNING: PLEASE USE HARFBUZZ. GOOD TEXT SHAPING IS IMPORTANT FOR INTERNATIONALISATION.
|
||||
ascent := f32(ascent)
|
||||
descent := f32(descent)
|
||||
line_gap := f32(line_gap)
|
||||
|
||||
position : Vec2
|
||||
advance : i32 = 0
|
||||
to_left_side_glyph : i32 = 0
|
||||
|
||||
prev_codepoint : rune
|
||||
for codepoint in text_utf8
|
||||
{
|
||||
if prev_codepoint > 0 {
|
||||
kern := parser_get_codepoint_kern_advance( & entry.parser_info, prev_codepoint, codepoint )
|
||||
position.x += f32(kern) * entry.size_scale
|
||||
}
|
||||
if codepoint == '\n'
|
||||
{
|
||||
position.x = 0.0
|
||||
position.y -= (ascent - descent + line_gap) * entry.size_scale
|
||||
position.y = cast(f32) i32( position.y + 0.5 )
|
||||
prev_codepoint = rune(0)
|
||||
continue
|
||||
}
|
||||
if abs( entry.size ) <= Advance_Snap_Smallfont_Size {
|
||||
position.x = math.ceil( position.x )
|
||||
}
|
||||
|
||||
append( & output.glyphs, parser_find_glyph_index( & entry.parser_info, codepoint ))
|
||||
advance, to_left_side_glyph = parser_get_codepoint_horizontal_metrics( & entry.parser_info, codepoint )
|
||||
|
||||
append( & output.positions, Vec2 {
|
||||
cast(f32) i32(position.x + 0.5),
|
||||
position.y
|
||||
})
|
||||
|
||||
position.x += f32(advance) * entry.size_scale
|
||||
prev_codepoint = codepoint
|
||||
}
|
||||
|
||||
output.end_cursor_pos = position
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user