From 93347346e8bd8f7412ae03a0858dd307a1df2e0d Mon Sep 17 00:00:00 2001
From: Micha White <botahamec@outlook.com>
Date: Thu, 20 Oct 2022 20:39:44 -0400
Subject: Moved files into workspace

---
 alligator_render/shaders/sprite.wgsl | 62 ++++++++++++++++++++++++++++++++++++
 1 file changed, 62 insertions(+)
 create mode 100644 alligator_render/shaders/sprite.wgsl

(limited to 'alligator_render/shaders')

diff --git a/alligator_render/shaders/sprite.wgsl b/alligator_render/shaders/sprite.wgsl
new file mode 100644
index 0000000..60b5773
--- /dev/null
+++ b/alligator_render/shaders/sprite.wgsl
@@ -0,0 +1,62 @@
+
+@group(0) @binding(0)
+var<uniform> camera: mat4x4<f32>;
+
+struct VertexInput {
+	@location(0) position: vec2<f32>
+}
+
+struct InstanceInput {
+	@location(1) position: vec2<f32>,
+	@location(2) size: vec2<f32>,
+	@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_index: f32,
+}
+
+struct VertexOutput {
+	@builtin(position) clip_position: vec4<f32>,
+	@location(0) texture_coordinates: vec2<f32>,
+	@location(1) texture_atlas_index: u32
+}
+
+@vertex
+fn vs_main(model: VertexInput, instance: InstanceInput) -> VertexOutput {
+	var out: VertexOutput;
+
+	// rotate the sprite
+	let rotation = -instance.rotation;
+	let a = vec2<f32>(cos(rotation), sin(rotation));
+	let b = vec2<f32>(-a[1], a[0]);
+	let rotation = mat2x2<f32>(a, b);
+	let rotated = rotation * model.position;
+
+	// scale the sprite
+	let scaled = rotated * instance.size;
+
+	// move the sprite
+	let position2d = scaled + instance.position;
+
+	// camera stuff
+	let position4d = vec4<f32>(position2d, instance.z_index, 1.0);
+	let position = camera * position4d;
+
+	let tex_coords = vec2<f32>(model.position[0] + 0.5, 1.0 - (model.position[1] + 0.5));
+
+	out.clip_position = position;
+	out.texture_atlas_index = instance.texture_atlas_index;
+	out.texture_coordinates = tex_coords * instance.texture_size + instance.texture_coordinates;
+	return out;
+}
+
+@group(1) @binding(0)
+var t_diffuse: texture_2d<f32>;
+@group(1) @binding(1)
+var s_diffuse: sampler;
+
+@fragment
+fn fs_main(in: VertexOutput) -> @location(0) vec4<f32> {
+	return textureSample(t_diffuse, s_diffuse, in.texture_coordinates);
+}
\ No newline at end of file
-- 
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