From ff8b849957ed63e6a19522597903f6bf55788426 Mon Sep 17 00:00:00 2001
From: Micha White <botahamec@outlook.com>
Date: Fri, 30 Sep 2022 21:20:08 -0400
Subject: Set up instances with texture information

---
 shaders/sprite.wgsl | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

(limited to 'shaders/sprite.wgsl')

diff --git a/shaders/sprite.wgsl b/shaders/sprite.wgsl
index f8b9e7e..22225f7 100644
--- a/shaders/sprite.wgsl
+++ b/shaders/sprite.wgsl
@@ -9,12 +9,17 @@ struct VertexInput {
 struct InstanceInput {
 	@location(1) position: vec2<f32>,
 	@location(2) size: vec2<f32>,
-	@location(3) rotation: f32,
-	@location(4) z_layer: u32
+	@location(3) texture_coordinates: vec2<f32>,
+	@location(4) texture_size: vec2<f32>,
+	@location(5) texture_atlas_index: u32,
+	@location(6) rotation: f32,
+	@location(7) z_layer: u32
 }
 
 struct VertexOutput {
-	@builtin(position) clip_position: vec4<f32>
+	@builtin(position) clip_position: vec4<f32>,
+	@location(0) texture_coordinates: vec2<f32>,
+	@location(1) texture_atlas_index: u32
 }
 
 @vertex
@@ -38,6 +43,8 @@ fn vs_main(model: VertexInput, instance: InstanceInput) -> VertexOutput {
 	let position = camera * position4d;
 
 	out.clip_position = position;
+	out.texture_atlas_index = instance.texture_atlas_index;
+	out.texture_coordinates = (model.position + 0.5) * instance.texture_size + instance.texture_coordinates;
 	return out;
 }
 
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