Optimize rendering

This moves some logic that was previously being done per-character into
the vertex shader. At this time, we've traded CPU computation for
additional gl::Uniform2f calls. This is only a marginal improvement.
However, this patch positions the renderer well for instanced drawing,
and that will be a huge performance win.

1 files changed, 13 insertions, 3 deletions

diff --git a/src/main.rs b/src/main.rs
index e5f9e0b3..733c4c6d 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -56,13 +56,14 @@ static INIT_LIST: &'static str = "abcdefghijklmnopqrstuvwxyz\
 
 type GlyphCache = HashMap<char, renderer::Glyph>;
 
+#[derive(Debug)]
 struct TermProps {
+    width: f32,
+    height: f32,
     cell_width: f32,
-    sep_x: f32,
     cell_height: f32,
+    sep_x: f32,
     sep_y: f32,
-    height: f32,
-    width: f32,
 }
 
 fn main() {
@@ -189,6 +190,15 @@ fn main() {
             width: width as f32,
         };
 
+        let props = TermProps {
+            cell_width: cell_width as f32,
+            cell_height: cell_height as f32,
+            sep_x: sep_x as f32,
+            sep_y: sep_y as f32,
+            height: height as f32,
+            width: width as f32,
+        };
+
         {
             let _sampler = meter.sampler();