17_shader_vertexbuffer.vert.diff

--- a/09_shader_base.vert
+++ b/17_shader_vertexbuffer.vert
@@ -1,25 +1,17 @@
 #version 450
 #extension GL_ARB_separate_shader_objects : enable
 
-out gl_PerVertex {
-    vec4 gl_Position;
-};
+// NOTE: names must match the `Vertex` struct in Rust
+layout(location = 0) in vec2 pos;
+layout(location = 1) in vec3 color;
 
 layout(location = 0) out vec3 fragColor;
 
-vec2 positions[3] = vec2[](
-    vec2(0.0, -0.5),
-    vec2(0.5, 0.5),
-    vec2(-0.5, 0.5)
-);
-
-vec3 colors[3] = vec3[](
-    vec3(1.0, 0.0, 0.0),
-    vec3(0.0, 1.0, 0.0),
-    vec3(0.0, 0.0, 1.0)
-);
+out gl_PerVertex {
+    vec4 gl_Position;
+};
 
 void main() {
-    gl_Position = vec4(positions[gl_VertexIndex], 0.0, 1.0);
-    fragColor = colors[gl_VertexIndex];
+    gl_Position = vec4(pos, 0.0, 1.0);
+    fragColor = color;
 }