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Reduce InstanceData footprint
The InstanceData type in the rendering subsystem was previously 16 floats which occupied a total of 64 bytes per instance. This meant that for every character or background cell drawn, 64 bytes were sent to the GPU. In the case of a 400x100 cell grid, a total of 2.5MB would be sent. This patch reduces InstanceData's size to 26 bytes, a 60% improvement! Using the above example for comparison, a worst case of 1MB would be transferred. The motivation for this patch comes from macOS. Once the terminal grid would reach a certain size, performance experienced a sharp and dramatic drop (render times would go from ~3ms to ~16ms). I don't want to speculate too much on the underlying issue, but suffice it to say that this patch alleviates the problem in my testing.
This commit is contained in:
Joe Wilm
Joe Wilm
parent
5a220b73db
commit
3cdba29124
4 changed files with 74 additions and 50 deletions
7
Cargo.lock
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7
Cargo.lock
generated
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@ -13,6 +13,7 @@ dependencies = [
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"font 0.1.0",
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"gl_generator 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
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"glutin 0.6.1 (git+https://github.com/jwilm/glutin?rev=cc64178d39a1fa06b2c5403117e5e0ef24deeac4)",
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"half 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
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"lazy_static 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
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"libc 0.2.23 (registry+https://github.com/rust-lang/crates.io-index)",
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"log 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
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@ -448,6 +449,11 @@ dependencies = [
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"x11-dl 2.14.0 (registry+https://github.com/rust-lang/crates.io-index)",
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]
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[[package]]
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name = "half"
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version = "1.0.0"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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[[package]]
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name = "heapsize"
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version = "0.3.9"
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@ -1291,6 +1297,7 @@ dependencies = [
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"checksum gl_generator 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)" = "0940975a4ca12b088d32b5d5134826c47d2e73de4b0b459b05244c01503eccbb"
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"checksum gleam 0.2.32 (registry+https://github.com/rust-lang/crates.io-index)" = "9590e0e578d528a080c5abac678e7efbe349a73c7316faafd4073edf5f462d01"
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"checksum glutin 0.6.1 (git+https://github.com/jwilm/glutin?rev=cc64178d39a1fa06b2c5403117e5e0ef24deeac4)" = "<none>"
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"checksum half 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "63d68db75012a85555434ee079e7e6337931f87a087ab2988becbadf64673a7f"
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"checksum heapsize 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)" = "556cd479866cf85c3f671209c85e8a6990211c916d1002c2fcb2e9b7cf60bc36"
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"checksum inotify 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)" = "e8458c07bdbdaf309c80e2c3304d14c3db64e7465d4f07cf589ccb83fd0ff31a"
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"checksum itoa 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)" = "eb2f404fbc66fd9aac13e998248505e7ecb2ad8e44ab6388684c5fb11c6c251c"
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@ -33,6 +33,7 @@ clap = "2.20"
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fnv = "1.0.5"
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unicode-width = "0.1.4"
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arraydeque = "0.2"
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half = "1.0"
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clippy = { version = "0.0.104", optional = true }
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[target.'cfg(any(target_os = "linux", target_os = "freebsd", target_os="dragonfly", target_os="openbsd"))'.dependencies]
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@ -38,6 +38,7 @@ extern crate errno;
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extern crate fnv;
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extern crate font;
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extern crate glutin;
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extern crate half;
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extern crate libc;
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extern crate mio;
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extern crate notify;
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@ -27,6 +27,7 @@ use gl::types::*;
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use gl;
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use index::{Line, Column, RangeInclusive};
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use notify::{Watcher as WatcherApi, RecommendedWatcher as Watcher, op};
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use half::f16;
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use config::{self, Config, Delta};
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use term::{self, cell, RenderableCell};
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@ -125,14 +126,14 @@ pub struct ShaderProgram {
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#[derive(Debug, Clone)]
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pub struct Glyph {
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tex_id: GLuint,
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top: f32,
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left: f32,
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width: f32,
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height: f32,
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uv_bot: f32,
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uv_left: f32,
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uv_width: f32,
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uv_height: f32,
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top: i16,
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left: i16,
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width: i16,
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height: i16,
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uv_bot: f16,
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uv_left: f16,
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uv_width: f16,
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uv_height: f16,
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}
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/// Naïve glyph cache
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@ -281,29 +282,33 @@ impl GlyphCache {
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#[derive(Debug)]
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#[repr(C)]
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struct InstanceData {
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// coords
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col: f32,
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row: f32,
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// Grid coordinates of the cell
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//
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// By storing these as u16, it puts a limit on the max dimensions of the
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// terminal to u16 max value. Practically speaking, this shouldn't be a
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// problem.
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col: u16,
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row: u16,
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// glyph offset
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left: f32,
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top: f32,
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left: i16,
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top: i16,
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// glyph scale
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width: f32,
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height: f32,
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width: i16,
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height: i16,
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// uv offset
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uv_left: f32,
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uv_bot: f32,
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uv_left: f16,
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uv_bot: f16,
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// uv scale
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uv_width: f32,
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uv_height: f32,
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uv_width: f16,
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uv_height: f16,
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// color
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r: f32,
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g: f32,
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b: f32,
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r: u8,
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g: u8,
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b: u8,
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// background color
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bg_r: f32,
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bg_g: f32,
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bg_b: f32,
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bg_r: u8,
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bg_g: u8,
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bg_b: u8,
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}
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#[derive(Debug)]
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@ -366,8 +371,8 @@ impl Batch {
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}
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self.instances.push(InstanceData {
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col: cell.column.0 as f32,
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row: cell.line.0 as f32,
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col: cell.column.0 as u16,
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row: cell.line.0 as u16,
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top: glyph.top,
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left: glyph.left,
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@ -379,13 +384,13 @@ impl Batch {
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uv_width: glyph.uv_width,
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uv_height: glyph.uv_height,
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r: cell.fg.r as f32,
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g: cell.fg.g as f32,
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b: cell.fg.b as f32,
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r: cell.fg.r,
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g: cell.fg.g,
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b: cell.fg.b,
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bg_r: cell.bg.r as f32,
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bg_g: cell.bg.g as f32,
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bg_b: cell.bg.b as f32,
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bg_r: cell.bg.r,
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bg_g: cell.bg.g,
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bg_b: cell.bg.b,
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});
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}
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@ -490,38 +495,48 @@ impl QuadRenderer {
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(BATCH_MAX * size_of::<InstanceData>()) as isize,
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ptr::null(), gl::STREAM_DRAW);
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// coords
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let mut size = 0;
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gl::VertexAttribPointer(1, 2,
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gl::FLOAT, gl::FALSE,
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gl::UNSIGNED_SHORT, gl::FALSE,
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size_of::<InstanceData>() as i32,
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ptr::null());
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gl::EnableVertexAttribArray(1);
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gl::VertexAttribDivisor(1, 1);
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size += 2 * size_of::<u16>();
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// glyphoffset
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gl::VertexAttribPointer(2, 4,
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gl::FLOAT, gl::FALSE,
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gl::SHORT, gl::FALSE,
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size_of::<InstanceData>() as i32,
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(2 * size_of::<f32>()) as *const _);
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size as *const _);
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gl::EnableVertexAttribArray(2);
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gl::VertexAttribDivisor(2, 1);
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size += 4 * size_of::<i16>();
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// uv
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gl::VertexAttribPointer(3, 4,
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gl::FLOAT, gl::FALSE,
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gl::HALF_FLOAT, gl::FALSE,
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size_of::<InstanceData>() as i32,
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(6 * size_of::<f32>()) as *const _);
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size as *const _);
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gl::EnableVertexAttribArray(3);
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gl::VertexAttribDivisor(3, 1);
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size += 4 * size_of::<f16>();
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// color
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gl::VertexAttribPointer(4, 3,
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gl::FLOAT, gl::FALSE,
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gl::UNSIGNED_BYTE, gl::FALSE,
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size_of::<InstanceData>() as i32,
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(10 * size_of::<f32>()) as *const _);
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size as *const _);
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gl::EnableVertexAttribArray(4);
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gl::VertexAttribDivisor(4, 1);
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size += 3 * size_of::<u8>();
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// color
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gl::VertexAttribPointer(5, 3,
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gl::FLOAT, gl::FALSE,
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gl::UNSIGNED_BYTE, gl::FALSE,
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size_of::<InstanceData>() as i32,
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(13 * size_of::<f32>()) as *const _);
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size as *const _);
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gl::EnableVertexAttribArray(5);
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gl::VertexAttribDivisor(5, 1);
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@ -1319,14 +1334,14 @@ impl Atlas {
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Glyph {
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tex_id: self.id,
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top: glyph.top as f32,
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width: width as f32,
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height: height as f32,
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left: glyph.left as f32,
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uv_bot: uv_bot,
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uv_left: uv_left,
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uv_width: uv_width,
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uv_height: uv_height,
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top: glyph.top as i16,
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width: width as i16,
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height: height as i16,
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left: glyph.left as i16,
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uv_bot: f16::from_f32(uv_bot),
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uv_left: f16::from_f32(uv_left),
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uv_width: f16::from_f32(uv_width),
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uv_height: f16::from_f32(uv_height),
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}
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}
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