render text

1 files changed, 17 insertions, 5 deletions

diff --git a/src/shader.wgsl b/src/shader.wgsl
index c154cc4..e0b34f4 100644
--- a/src/shader.wgsl
+++ b/src/shader.wgsl
@@ -1,18 +1,30 @@
-@group(0) @binding(0) var tex_sampler: sampler;
-@group(0) @binding(1) var font_tex:    texture_2d<f32>;
+struct Instance {
+	position: vec2<f32>,
+	scale:    vec2<f32>,
+	uv:       vec4<f32>,
+}
 
 struct VertexOutput {
 	@builtin(position) position: vec4<f32>,
 	@location(0)       uv:       vec2<f32>,
 }
 
+@group(0) @binding(0) var<storage, read> instances: array<Instance>;
+
+@group(1) @binding(0) var tex_sampler: sampler;
+@group(1) @binding(1) var font_tex:    texture_2d<f32>;
+
 @vertex
-fn vs_main(@builtin(vertex_index) in_vertex_index: u32) -> VertexOutput {
+fn vs_main(
+	@builtin(vertex_index)   in_vertex_index:   u32,
+	@builtin(instance_index) in_instance_index: u32,
+) -> VertexOutput {
 	let uv = vec2<f32>(f32((in_vertex_index << 1) & 2), f32(in_vertex_index & 2)) / 2.0;
+	let instance = instances[in_instance_index];
 
 	var out: VertexOutput;
-	out.position = vec4<f32>(uv.x - 0.5, uv.y - 0.5, 0.0, 1.0);
-	out.uv = uv;
+	out.position = vec4<f32>(instance.position + (uv - 0.5) * instance.scale * 2.0, 0.0, 1.0);
+	out.uv = instance.uv.xy + vec2<f32>(uv.x, 1.0 - uv.y) * instance.uv.zw;
 
 	return out;
 }