From 1fc7c4f7a99a3238c3af662daa7c3af7c79cee15 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Tristram=20Gr=C3=A4bener?= <tristramg@gmail.com>
Date: Sat, 18 Feb 2023 21:06:24 +0100
Subject: [PATCH] Debug line now have same pixel width (#255)

Closes #230
---
 maplibre/src/render/shaders/mod.rs                 | 6 ++++++
 maplibre/src/render/shaders/tile_debug.vertex.wgsl | 3 ++-
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/maplibre/src/render/shaders/mod.rs b/maplibre/src/render/shaders/mod.rs
index 1e8c1b1c2..b9db2a654 100644
--- a/maplibre/src/render/shaders/mod.rs
+++ b/maplibre/src/render/shaders/mod.rs
@@ -64,6 +64,12 @@ impl Shader for TileMaskShader {
                         format: wgpu::VertexFormat::Float32x4,
                         shader_location: 7,
                     },
+                    // zoom factor
+                    wgpu::VertexAttribute {
+                        offset: 4 * wgpu::VertexFormat::Float32x4.size(),
+                        format: wgpu::VertexFormat::Float32,
+                        shader_location: 9,
+                    },
                 ],
             }],
         }
diff --git a/maplibre/src/render/shaders/tile_debug.vertex.wgsl b/maplibre/src/render/shaders/tile_debug.vertex.wgsl
index 5eb27e8c5..92cebd20f 100644
--- a/maplibre/src/render/shaders/tile_debug.vertex.wgsl
+++ b/maplibre/src/render/shaders/tile_debug.vertex.wgsl
@@ -12,6 +12,7 @@ fn main(
     @location(5) translate2: vec4<f32>,
     @location(6) translate3: vec4<f32>,
     @location(7) translate4: vec4<f32>,
+    @location(9) zoom_factor: f32,
     @builtin(vertex_index) vertex_idx: u32,
     @builtin(instance_index) instance_idx: u32 // instance_index is used when we have multiple instances of the same "object"
 ) -> VertexOutput {
@@ -20,7 +21,7 @@ fn main(
     let target_width = 1.0;
     let target_height = 1.0;
 
-    let WIDTH = EXTENT / 1024.0;
+    let WIDTH = EXTENT * zoom_factor / 1024.0;
 
     var VERTICES: array<vec3<f32>, 24> = array<vec3<f32>, 24>(
         // Debug lines vertices