From 4452a8f467765cbfa0dd0444a9bf416ac8bd0bf5 Mon Sep 17 00:00:00 2001 From: Gabriel Schneider Date: Tue, 29 Sep 2026 05:44:11 -0300 Subject: G4: bloom, vignette and grain in the post chain MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Three bundled Shadertoy passes beside Crt, each `Bloom|Vignette|Grain 0..3` (off by default, nothing drawn while off), in shaders/post/: - Bloom: what is brighter than the page (a channel's linear peak over 0.75/0.7/0.6 and over the page's own + 0.15, so a light page does not bloom) glows, 2/3.5/5% (ยง8.2's budget). The glow is a dual Kawase blur in RGBA16F textures at half size and down, 3/4/5 steps by level (shaders/bloom-down, bloom-up; Post.bloomChain), composited in linear light and dithered. - Vignette: round, from halfway to a corner, 10/18/28% at the far corners, in linear light, dithered. - Grain: a still, triangular-spread grain of 1.5/3/5 of 255 on page-coloured pixels only, a logical pixel big; still, so it asks for no frames. Focus rule: the shell passes every bundled pass the rectangles of the tags with their grips, the column and workspace tags, the notices and the cursor (pardesSpare, at most 32, neighbours on one row merged), and a bundled pass leaves them as they are; and a per-theme ceiling (pardesCap, Post.capsOf) keeps the page's text and the selection's text at min(their contrast, 4.5) under each pass at its strongest. User files get no ceiling and no spared rectangles. Fix found on the way: SDL GPU binds at most 4 KiB of a uniform block, so every Shadertoy colour after iPalette (iBackgroundColor, iForegroundColor, the cursor and selection colours, iPalette[>=4]) read zero. The prefix's block is cut in three (Globals, Palette, Colors) with ghostty's names and order, each pushed as a slice of the one struct; pardes's own block moves to binding 3. Tests: the caps hold over every native theme; each uniform slice fits 4 KiB; the prefix's members in ghostty's order across its blocks. Gates: tty/gui unit-test and core-test pass; snap fails only nested-optout; GUI goldens 01-08 byte-identical (09-18 wait on wkzlsqvy, as in somtrmsz); web builds. Feel review material: .scratch/render/{bloom,vignette,grain}/ (levels on forge, dusk, acme, crops, a levels mp4). --- src/effect_sources.zig | 13 +++++++++++++ 1 file changed, 13 insertions(+) (limited to 'src/effect_sources.zig') diff --git a/src/effect_sources.zig b/src/effect_sources.zig index 83bd1313..328ce730 100644 --- a/src/effect_sources.zig +++ b/src/effect_sources.zig @@ -14,6 +14,11 @@ const image_fragment_path = shader_dir ++ "image.frag.glsl"; const post_vertex_path = shader_dir ++ "post.vert.glsl"; // The bundled post pass as compiled: the prefix and the pass together. const post_crt_path = shader_dir ++ "post-crt.frag.glsl"; +const post_bloom_path = shader_dir ++ "post-bloom.frag.glsl"; +const post_vignette_path = shader_dir ++ "post-vignette.frag.glsl"; +const post_grain_path = shader_dir ++ "post-grain.frag.glsl"; +const bloom_down_path = shader_dir ++ "bloom-down.frag.glsl"; +const bloom_up_path = shader_dir ++ "bloom-up.frag.glsl"; pub const Backend = @TypeOf(build_config.platform); pub const backend: Backend = build_config.platform; @@ -53,6 +58,11 @@ pub const files = switch (backend) { .{ .path = image_fragment_path, .contents = @embedFile("effect-source-image.frag.glsl") }, .{ .path = post_vertex_path, .contents = @embedFile("effect-source-post.vert.glsl") }, .{ .path = post_crt_path, .contents = @embedFile("effect-source-post-crt.frag.glsl") }, + .{ .path = post_bloom_path, .contents = @embedFile("effect-source-post-bloom.frag.glsl") }, + .{ .path = post_vignette_path, .contents = @embedFile("effect-source-post-vignette.frag.glsl") }, + .{ .path = post_grain_path, .contents = @embedFile("effect-source-post-grain.frag.glsl") }, + .{ .path = bloom_down_path, .contents = @embedFile("effect-source-bloom-down.frag.glsl") }, + .{ .path = bloom_up_path, .contents = @embedFile("effect-source-bloom-up.frag.glsl") }, }, .macos => [_]filesystem.Source{ .{ .path = "src/macos/Sources/PardesView.swift", .contents = @embedFile("macos/Sources/PardesView.swift") }, @@ -73,6 +83,9 @@ pub fn forSetting(setting: config.Runtime.Setting) ?[]const []const u8 { .scene => |effect| switch (backend) { .gui => switch (effect) { .crt => &.{ "src/gui/Post.zig", "src/gui/gui.zig", post_vertex_path, post_crt_path }, + .bloom => &.{ "src/gui/Post.zig", "src/gui/gui.zig", post_vertex_path, bloom_down_path, bloom_up_path, post_bloom_path }, + .vignette => &.{ "src/gui/Post.zig", "src/gui/gui.zig", post_vertex_path, post_vignette_path }, + .grain => &.{ "src/gui/Post.zig", "src/gui/gui.zig", post_vertex_path, post_grain_path }, }, .macos => &.{ "src/macos/Sources/PardesView.swift", "src/macos/Sources/ScenePostprocessor.swift", "shaders/crt.ci.metal" }, .tty, .web, .esp32p4 => null, -- cgit v1.3