From c29555bddac1c0027bf6e15d91e219adaa088065 Mon Sep 17 00:00:00 2001
From: Micha White <botahamec@outlook.com>
Date: Sat, 24 Sep 2022 18:20:46 -0400
Subject: Implemented a camera

---
 shaders/sprite.wgsl | 16 +++++++++++-----
 1 file changed, 11 insertions(+), 5 deletions(-)

(limited to 'shaders/sprite.wgsl')

diff --git a/shaders/sprite.wgsl b/shaders/sprite.wgsl
index b8ce42b..2358f43 100644
--- a/shaders/sprite.wgsl
+++ b/shaders/sprite.wgsl
@@ -1,4 +1,7 @@
 
+@group(0) @binding(0)
+var<uniform> camera: mat4x4<f32>;
+
 struct VertexInput {
 	@location(0) position: vec2<f32>
 }
@@ -7,7 +10,7 @@ struct InstanceInput {
 	@location(1) position: vec2<f32>,
 	@location(2) size: vec2<f32>,
 	@location(3) rotation: f32,
-	@location(4) z_layer: i32
+	@location(4) z_layer: u32
 }
 
 struct VertexOutput {
@@ -25,13 +28,16 @@ fn vs_main(model: VertexInput, instance: InstanceInput) -> VertexOutput {
 	let rotated = rotation * model.position;
 
 	// scale the sprite
-	let x = rotated[0] * instance.size[0];
-	let y = rotated[1] * instance.size[1];
+	let scaled = rotated * instance.size;
 
 	// move the sprite
-	let position = vec2<f32>(x, y) + instance.position;
+	let position2d = scaled + instance.position;
+
+	// camera stuff
+	let position4d = vec4<f32>(position2d, f32(instance.z_layer), 1.0);
+	out.clip_position = camera * position4d;
+	//out.clip_position = position4d;
 
-	out.clip_position = vec4<f32>(position, f32(instance.z_layer), 1.0);
 	return out;
 }
 
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