From 430def68f4e38c9165c92e5de0f9e31c5b748c36 Mon Sep 17 00:00:00 2001
From: Stanislaw Halik <sthalik@misaki.pl>
Date: Tue, 8 Nov 2022 07:48:50 +0100
Subject: precompute the scale shader uniform

---
 shaders/tile.cpp  | 2 +-
 shaders/tile.vert | 3 +--
 2 files changed, 2 insertions(+), 3 deletions(-)

(limited to 'shaders')

diff --git a/shaders/tile.cpp b/shaders/tile.cpp
index 4fb7fe1b..2fb37cd8 100644
--- a/shaders/tile.cpp
+++ b/shaders/tile.cpp
@@ -37,7 +37,7 @@ tile_shader::~tile_shader() = default;
 tile_shader& tile_shader::set_scale(const Vector2& scale)
 {
     if (scale != _scale)
-        setUniform(ScaleUniform, _scale = scale);
+        setUniform(ScaleUniform, 1.f/(_scale = scale));
     return *this;
 }
 
diff --git a/shaders/tile.vert b/shaders/tile.vert
index 8b3f2dba..b512b7ac 100644
--- a/shaders/tile.vert
+++ b/shaders/tile.vert
@@ -8,8 +8,7 @@ layout (location = 1) in vec2 texcoords;
 noperspective out vec2 frag_texcoords;
 
 void main() {
-    float cx = 1/scale.x, cy = 1/scale.y;
     float x = -position.y, y = -position.x, z = position.z;
-    gl_Position = vec4((x-y+offset.x)*cx, (x+y+z*2)*cy*.59-offset.y*cy, 0, 1);
+    gl_Position = vec4((x-y+offset.x)*scale.x, ((x+y+z*2)*.59-offset.y)*scale.y, 0, 1);
     frag_texcoords = texcoords;
 }
-- 
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