From 652c7242fb47dfecf365c668c117dd984e2b40f2 Mon Sep 17 00:00:00 2001
From: Joshua Groves <josh@joshgroves.com>
Date: Sat, 28 Mar 2020 23:52:00 -0230
Subject: [PATCH] [rs] Avoid array indexing in hello-triangle

---
 wgpu/examples/hello-triangle/shader.vert     |   9 ++-------
 wgpu/examples/hello-triangle/shader.vert.spv | Bin 904 -> 884 bytes
 2 files changed, 2 insertions(+), 7 deletions(-)

diff --git a/wgpu/examples/hello-triangle/shader.vert b/wgpu/examples/hello-triangle/shader.vert
index ac6dcc7c32..2b9399e710 100644
--- a/wgpu/examples/hello-triangle/shader.vert
+++ b/wgpu/examples/hello-triangle/shader.vert
@@ -4,12 +4,7 @@ out gl_PerVertex {
     vec4 gl_Position;
 };
 
-const vec2 positions[3] = vec2[3](
-    vec2(0.0, -0.5),
-    vec2(0.5, 0.5),
-    vec2(-0.5, 0.5)
-);
-
 void main() {
-    gl_Position = vec4(positions[gl_VertexIndex], 0.0, 1.0);
+    vec2 position = vec2(gl_VertexIndex, (gl_VertexIndex & 1) * 2) - 1;
+    gl_Position = vec4(position, 0.0, 1.0);
 }
diff --git a/wgpu/examples/hello-triangle/shader.vert.spv b/wgpu/examples/hello-triangle/shader.vert.spv
index 9a3f5994b71471f4f282bdb2299e70ce2ebd9d62..ea22e0c6c8c517586dffef3e917584826c32602b 100644
GIT binary patch
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