mirror of
https://github.com/Ed94/VEFontCache-Odin.git
synced 2025-08-06 06:52:44 -07:00
237 lines
7.4 KiB
Odin
237 lines
7.4 KiB
Odin
package vefontcache
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import "base:runtime"
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import "core:simd"
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import "core:math"
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import core_log "core:log"
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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_64 :: [2]f64
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vec2_from_scalar :: #force_inline proc "contextless" ( scalar : f32 ) -> Vec2 { return { scalar, scalar }}
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vec2_64_from_vec2 :: #force_inline proc "contextless" ( v2 : Vec2 ) -> Vec2_64 { return { f64(v2.x), f64(v2.y) }}
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vec2_from_vec2i :: #force_inline proc "contextless" ( v2i : Vec2i ) -> Vec2 { return { f32(v2i.x), f32(v2i.y) }}
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vec2i_from_vec2 :: #force_inline proc "contextless" ( v2 : Vec2 ) -> Vec2i { return { i32(v2.x), i32(v2.y) }}
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@(require_results) ceil_vec2 :: proc "contextless" ( v : Vec2 ) -> Vec2 { return { ceil_f32(v.x), ceil_f32(v.y) } }
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@(require_results) floor_vec2 :: proc "contextless" ( v : Vec2 ) -> Vec2 { return { floor_f32(v.x), floor_f32(v.y) } }
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// This buffer is used below excluisvely to prevent any allocator recusion when verbose logging from allocators.
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// This means a single line is limited to 4k buffer
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Logger_Allocator_Buffer : [4 * Kilobyte]u8
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log :: proc( msg : string, level := core_log.Level.Info, loc := #caller_location ) {
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temp_arena : Arena; arena_init(& temp_arena, Logger_Allocator_Buffer[:])
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context.allocator = arena_allocator(& temp_arena)
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context.temp_allocator = arena_allocator(& temp_arena)
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core_log.log( level, msg, location = loc )
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}
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logf :: proc( fmt : string, args : ..any, level := core_log.Level.Info, loc := #caller_location ) {
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temp_arena : Arena; arena_init(& temp_arena, Logger_Allocator_Buffer[:])
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context.allocator = arena_allocator(& temp_arena)
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context.temp_allocator = arena_allocator(& temp_arena)
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core_log.logf( level, fmt, ..args, location = loc )
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}
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reload_array :: proc( self : ^[dynamic]$Type, allocator : Allocator ) {
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raw := transmute( ^runtime.Raw_Dynamic_Array) self
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raw.allocator = allocator
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}
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reload_map :: proc( self : ^map [$KeyType] $EntryType, allocator : Allocator ) {
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raw := transmute( ^runtime.Raw_Map) self
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raw.allocator = allocator
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}
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font_glyph_lru_code :: #force_inline proc "contextless" ( font : FontID, glyph_index : Glyph ) -> (lru_code : u64) {
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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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is_empty :: #force_inline 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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if parser_is_glyph_empty( & entry.parser_info, glyph_index ) do return true
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return false
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}
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mark_batch_codepoint_seen :: #force_inline proc ( ctx : ^Context, lru_code : u64 ) {
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ctx.temp_codepoint_seen[lru_code] = true
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ctx.temp_codepoint_seen_num += 1
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}
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reset_batch_codepoint_state :: #force_inline proc( ctx : ^Context ) {
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clear_map( & ctx.temp_codepoint_seen )
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ctx.temp_codepoint_seen_num = 0
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}
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screenspace_x_form :: #force_inline proc "contextless" ( position, scale : ^Vec2, size : Vec2 )
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{
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if true
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{
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pos_64 := vec2_64_from_vec2(position^)
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scale_64 := vec2_64_from_vec2(scale^)
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quotient : Vec2_64 = 1.0 / vec2_64(size)
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pos_64 = pos_64 * quotient * 2.0 - 1.0
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scale_64 = scale_64 * quotient * 2.0
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(position^) = { f32(pos_64.x), f32(pos_64.y) }
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(scale^) = { f32(scale_64.x), f32(scale_64.y) }
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}
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else
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{
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pos := position^
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scale_32 := scale^
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quotient : Vec2 = 1.0 / size
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pos = pos * quotient * 2.0 - 1.0
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scale_32 = scale_32 * quotient * 2.0
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(position^) = pos
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(scale^) = scale_32
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}
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}
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textspace_x_form :: #force_inline proc "contextless" ( position, scale : ^Vec2, size : Vec2 )
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{
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if true
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{
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pos_64 := vec2_64_from_vec2(position^)
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scale_64 := vec2_64_from_vec2(scale^)
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quotient : Vec2_64 = 1.0 / vec2_64(size)
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pos_64 *= quotient
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scale_64 *= quotient
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(position^) = { f32(pos_64.x), f32(pos_64.y) }
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(scale^) = { f32(scale_64.x), f32(scale_64.y) }
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}
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else
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{
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quotient : Vec2 = 1.0 / size
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(position^) *= quotient
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(scale^) *= quotient
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}
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}
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Use_SIMD_For_Bezier_Ops :: true
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when ! Use_SIMD_For_Bezier_Ops
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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 :: #force_inline proc "contextless" ( p0, p1, p2 : Vec2, alpha : f32 ) -> Vec2
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{
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p0 := vec2_64(p0)
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p1 := vec2_64(p1)
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p2 := vec2_64(p2)
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alpha := f64(alpha)
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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 { f32(point.x), f32(point.y) }
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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 :: #force_inline proc "contextless" ( p0, p1, p2, p3 : Vec2, alpha : f32 ) -> Vec2
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{
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p0 := vec2_64(p0)
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p1 := vec2_64(p1)
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p2 := vec2_64(p2)
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p3 := vec2_64(p3)
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alpha := f64(alpha)
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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 { f32(point.x), f32(point.y) }
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}
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}
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else
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{
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Vec2_SIMD :: simd.f32x4
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vec2_to_simd :: #force_inline proc "contextless" (v: Vec2) -> Vec2_SIMD {
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return Vec2_SIMD{v.x, v.y, 0, 0}
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}
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simd_to_vec2 :: #force_inline proc "contextless" (v: Vec2_SIMD) -> Vec2 {
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return Vec2{ simd.extract(v, 0), simd.extract(v, 1) }
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}
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eval_point_on_bezier3 :: #force_inline proc "contextless" (p0, p1, p2: Vec2, alpha: f32) -> Vec2
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{
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simd_p0 := vec2_to_simd(p0)
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simd_p1 := vec2_to_simd(p1)
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simd_p2 := vec2_to_simd(p2)
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one_minus_alpha := 1.0 - alpha
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weight_start := one_minus_alpha * one_minus_alpha
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weight_control := 2.0 * one_minus_alpha * alpha
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weight_end := alpha * alpha
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simd_weights := Vec2_SIMD{weight_start, weight_control, weight_end, 0}
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result := simd.add(
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simd.add(
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simd.mul( simd_p0, simd.swizzle( simd_weights, 0, 0, 0, 0) ),
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simd.mul( simd_p1, simd.swizzle( simd_weights, 1, 1, 1, 1) )
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),
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simd.mul( simd_p2, simd.swizzle(simd_weights, 2, 2, 2, 2) )
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)
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return simd_to_vec2(result)
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}
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eval_point_on_bezier4 :: #force_inline proc "contextless" (p0, p1, p2, p3: Vec2, alpha: f32) -> Vec2
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{
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simd_p0 := vec2_to_simd(p0)
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simd_p1 := vec2_to_simd(p1)
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simd_p2 := vec2_to_simd(p2)
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simd_p3 := vec2_to_simd(p3)
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one_minus_alpha := 1.0 - alpha
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weight_start := one_minus_alpha * one_minus_alpha * one_minus_alpha
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weight_c_a := 3 * one_minus_alpha * one_minus_alpha * alpha
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weight_c_b := 3 * one_minus_alpha * alpha * alpha
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weight_end := alpha * alpha * alpha
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simd_weights := Vec2_SIMD { weight_start, weight_c_a, weight_c_b, weight_end }
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result := simd.add(
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simd.add(
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simd.mul( simd_p0, simd.swizzle(simd_weights, 0, 0, 0, 0) ),
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simd.mul( simd_p1, simd.swizzle(simd_weights, 1, 1, 1, 1) )
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),
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simd.add(
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simd.mul( simd_p2, simd.swizzle(simd_weights, 2, 2, 2, 2) ),
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simd.mul( simd_p3, simd.swizzle(simd_weights, 3, 3, 3, 3) )
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)
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)
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return simd_to_vec2(result)
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}
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}
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