From 3f467d121229142177ef1b2f417fe87c7bf7fdf2 Mon Sep 17 00:00:00 2001
From: Jim Eckerlein <jim.eckerlein@icloud.com>
Date: Sun, 24 Sep 2023 15:10:19 +0200
Subject: Compute vertex position in shader

---
 wgpu/src/shader/quad/gradient.wgsl | 4 ++--
 wgpu/src/shader/quad/solid.wgsl    | 4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)

(limited to 'wgpu/src/shader/quad')

diff --git a/wgpu/src/shader/quad/gradient.wgsl b/wgpu/src/shader/quad/gradient.wgsl
index 0754e97f..36cae61c 100644
--- a/wgpu/src/shader/quad/gradient.wgsl
+++ b/wgpu/src/shader/quad/gradient.wgsl
@@ -1,5 +1,5 @@
 struct GradientVertexInput {
-    @location(0) v_pos: vec2<f32>,
+    @builtin(vertex_index) vertex_index: u32,
     @location(1) @interpolate(flat) colors_1: vec4<u32>,
     @location(2) @interpolate(flat) colors_2: vec4<u32>,
     @location(3) @interpolate(flat) colors_3: vec4<u32>,
@@ -48,7 +48,7 @@ fn gradient_vs_main(input: GradientVertexInput) -> GradientVertexOutput {
         vec4<f32>(pos - vec2<f32>(0.5, 0.5), 0.0, 1.0)
     );
 
-    out.position = globals.transform * transform * vec4<f32>(input.v_pos, 0.0, 1.0);
+    out.position = globals.transform * transform * vec4<f32>(vertex_position(input.vertex_index), 0.0, 1.0);
     out.colors_1 = input.colors_1;
     out.colors_2 = input.colors_2;
     out.colors_3 = input.colors_3;
diff --git a/wgpu/src/shader/quad/solid.wgsl b/wgpu/src/shader/quad/solid.wgsl
index ebd6d877..5fc5b13a 100644
--- a/wgpu/src/shader/quad/solid.wgsl
+++ b/wgpu/src/shader/quad/solid.wgsl
@@ -1,5 +1,5 @@
 struct SolidVertexInput {
-    @location(0) v_pos: vec2<f32>,
+    @builtin(vertex_index) vertex_index: u32,
     @location(1) color: vec4<f32>,
     @location(2) pos: vec2<f32>,
     @location(3) scale: vec2<f32>,
@@ -40,7 +40,7 @@ fn solid_vs_main(input: SolidVertexInput) -> SolidVertexOutput {
         vec4<f32>(pos - vec2<f32>(0.5, 0.5), 0.0, 1.0)
     );
 
-    out.position = globals.transform * transform * vec4<f32>(input.v_pos, 0.0, 1.0);
+    out.position = globals.transform * transform * vec4<f32>(vertex_position(input.vertex_index), 0.0, 1.0);
     out.color = input.color;
     out.border_color = input.border_color;
     out.pos = pos;
-- 
cgit