Revert "Reduce InstanceData footprint"

This reverts commit 3cdba291242cc1c1684bff7f8242262b1cdeb582.

On some systems, the target commit actually caused a massive performance
issue rather than fixing one.

4 files changed, 50 insertions, 74 deletions

diff --git a/Cargo.lock b/Cargo.lock
index c4f7a99a..86a34f14 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -13,7 +13,6 @@ dependencies = [
  "font 0.1.0",
  "gl_generator 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "glutin 0.6.1 (git+https://github.com/jwilm/glutin?rev=cc64178d39a1fa06b2c5403117e5e0ef24deeac4)",
- "half 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.23 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -450,11 +449,6 @@ dependencies = [
 ]
 
 [[package]]
-name = "half"
-version = "1.0.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
-[[package]]
 name = "heapsize"
 version = "0.3.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -1297,7 +1291,6 @@ dependencies = [
 "checksum gl_generator 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)" = "0940975a4ca12b088d32b5d5134826c47d2e73de4b0b459b05244c01503eccbb"
 "checksum gleam 0.2.32 (registry+https://github.com/rust-lang/crates.io-index)" = "9590e0e578d528a080c5abac678e7efbe349a73c7316faafd4073edf5f462d01"
 "checksum glutin 0.6.1 (git+https://github.com/jwilm/glutin?rev=cc64178d39a1fa06b2c5403117e5e0ef24deeac4)" = "<none>"
-"checksum half 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "63d68db75012a85555434ee079e7e6337931f87a087ab2988becbadf64673a7f"
 "checksum heapsize 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)" = "556cd479866cf85c3f671209c85e8a6990211c916d1002c2fcb2e9b7cf60bc36"
 "checksum inotify 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)" = "e8458c07bdbdaf309c80e2c3304d14c3db64e7465d4f07cf589ccb83fd0ff31a"
 "checksum itoa 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)" = "eb2f404fbc66fd9aac13e998248505e7ecb2ad8e44ab6388684c5fb11c6c251c"
diff --git a/Cargo.toml b/Cargo.toml
index 5191de04..4709ea67 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -33,7 +33,6 @@ clap = "2.20"
 fnv = "1.0.5"
 unicode-width = "0.1.4"
 arraydeque = "0.2"
-half = "1.0"
 clippy = { version = "0.0.104", optional = true }
 
 [target.'cfg(any(target_os = "linux", target_os = "freebsd", target_os="dragonfly", target_os="openbsd"))'.dependencies]
diff --git a/src/lib.rs b/src/lib.rs
index 0786013e..684e89af 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -38,7 +38,6 @@ extern crate errno;
 extern crate fnv;
 extern crate font;
 extern crate glutin;
-extern crate half;
 extern crate libc;
 extern crate mio;
 extern crate notify;
diff --git a/src/renderer/mod.rs b/src/renderer/mod.rs
index de8e4f78..7c1c011b 100644
--- a/src/renderer/mod.rs
+++ b/src/renderer/mod.rs
@@ -27,7 +27,6 @@ use gl::types::*;
 use gl;
 use index::{Line, Column, RangeInclusive};
 use notify::{Watcher as WatcherApi, RecommendedWatcher as Watcher, op};
-use half::f16;
 
 use config::{self, Config, Delta};
 use term::{self, cell, RenderableCell};
@@ -126,14 +125,14 @@ pub struct ShaderProgram {
 #[derive(Debug, Clone)]
 pub struct Glyph {
     tex_id: GLuint,
-    top: i16,
-    left: i16,
-    width: i16,
-    height: i16,
-    uv_bot: f16,
-    uv_left: f16,
-    uv_width: f16,
-    uv_height: f16,
+    top: f32,
+    left: f32,
+    width: f32,
+    height: f32,
+    uv_bot: f32,
+    uv_left: f32,
+    uv_width: f32,
+    uv_height: f32,
 }
 
 /// Naïve glyph cache
@@ -282,33 +281,29 @@ impl GlyphCache {
 #[derive(Debug)]
 #[repr(C)]
 struct InstanceData {
-    // Grid coordinates of the cell
-    //
-    // By storing these as u16, it puts a limit on the max dimensions of the
-    // terminal to u16 max value. Practically speaking, this shouldn't be a
-    // problem.
-    col: u16,
-    row: u16,
+    // coords
+    col: f32,
+    row: f32,
     // glyph offset
-    left: i16,
-    top: i16,
+    left: f32,
+    top: f32,
     // glyph scale
-    width: i16,
-    height: i16,
+    width: f32,
+    height: f32,
     // uv offset
-    uv_left: f16,
-    uv_bot: f16,
+    uv_left: f32,
+    uv_bot: f32,
     // uv scale
-    uv_width: f16,
-    uv_height: f16,
+    uv_width: f32,
+    uv_height: f32,
     // color
-    r: u8,
-    g: u8,
-    b: u8,
+    r: f32,
+    g: f32,
+    b: f32,
     // background color
-    bg_r: u8,
-    bg_g: u8,
-    bg_b: u8,
+    bg_r: f32,
+    bg_g: f32,
+    bg_b: f32,
 }
 
 #[derive(Debug)]
@@ -371,8 +366,8 @@ impl Batch {
         }
 
         self.instances.push(InstanceData {
-            col: cell.column.0 as u16,
-            row: cell.line.0 as u16,
+            col: cell.column.0 as f32,
+            row: cell.line.0 as f32,
 
             top: glyph.top,
             left: glyph.left,
@@ -384,13 +379,13 @@ impl Batch {
             uv_width: glyph.uv_width,
             uv_height: glyph.uv_height,
 
-            r: cell.fg.r,
-            g: cell.fg.g,
-            b: cell.fg.b,
+            r: cell.fg.r as f32,
+            g: cell.fg.g as f32,
+            b: cell.fg.b as f32,
 
-            bg_r: cell.bg.r,
-            bg_g: cell.bg.g,
-            bg_b: cell.bg.b,
+            bg_r: cell.bg.r as f32,
+            bg_g: cell.bg.g as f32,
+            bg_b: cell.bg.b as f32,
         });
     }
 
@@ -495,48 +490,38 @@ impl QuadRenderer {
                            (BATCH_MAX * size_of::<InstanceData>()) as isize,
                            ptr::null(), gl::STREAM_DRAW);
             // coords
-            let mut size = 0;
             gl::VertexAttribPointer(1, 2,
-                                    gl::UNSIGNED_SHORT, gl::FALSE,
+                                    gl::FLOAT, gl::FALSE,
                                     size_of::<InstanceData>() as i32,
                                     ptr::null());
             gl::EnableVertexAttribArray(1);
             gl::VertexAttribDivisor(1, 1);
-            size += 2 * size_of::<u16>();
-
-
             // glyphoffset
             gl::VertexAttribPointer(2, 4,
-                                    gl::SHORT, gl::FALSE,
+                                    gl::FLOAT, gl::FALSE,
                                     size_of::<InstanceData>() as i32,
-                                    size as *const _);
+                                    (2 * size_of::<f32>()) as *const _);
             gl::EnableVertexAttribArray(2);
             gl::VertexAttribDivisor(2, 1);
-            size += 4 * size_of::<i16>();
-
             // uv
             gl::VertexAttribPointer(3, 4,
-                                    gl::HALF_FLOAT, gl::FALSE,
+                                    gl::FLOAT, gl::FALSE,
                                     size_of::<InstanceData>() as i32,
-                                    size as *const _);
+                                    (6 * size_of::<f32>()) as *const _);
             gl::EnableVertexAttribArray(3);
             gl::VertexAttribDivisor(3, 1);
-            size += 4 * size_of::<f16>();
-
             // color
             gl::VertexAttribPointer(4, 3,
-                                    gl::UNSIGNED_BYTE, gl::FALSE,
+                                    gl::FLOAT, gl::FALSE,
                                     size_of::<InstanceData>() as i32,
-                                    size as *const _);
+                                    (10 * size_of::<f32>()) as *const _);
             gl::EnableVertexAttribArray(4);
             gl::VertexAttribDivisor(4, 1);
-            size += 3 * size_of::<u8>();
-
             // color
             gl::VertexAttribPointer(5, 3,
-                                    gl::UNSIGNED_BYTE, gl::FALSE,
+                                    gl::FLOAT, gl::FALSE,
                                     size_of::<InstanceData>() as i32,
-                                    size as *const _);
+                                    (13 * size_of::<f32>()) as *const _);
             gl::EnableVertexAttribArray(5);
             gl::VertexAttribDivisor(5, 1);
 
@@ -1334,14 +1319,14 @@ impl Atlas {
 
         Glyph {
             tex_id: self.id,
-            top: glyph.top as i16,
-            width: width as i16,
-            height: height as i16,
-            left: glyph.left as i16,
-            uv_bot: f16::from_f32(uv_bot),
-            uv_left: f16::from_f32(uv_left),
-            uv_width: f16::from_f32(uv_width),
-            uv_height: f16::from_f32(uv_height),
+            top: glyph.top as f32,
+            width: width as f32,
+            height: height as f32,
+            left: glyph.left as f32,
+            uv_bot: uv_bot,
+            uv_left: uv_left,
+            uv_width: uv_width,
+            uv_height: uv_height,
         }
     }