circles, man!

shaders/shader.slang

@@ -5,6 +5,8 @@ struct VSInput {
     float4 color;
     float alpha;
     uint32_t textureID;
+
+    uint vertex_index : SV_VertexID;
 };
 
 struct VSOutput {
@@ -26,13 +28,13 @@ static const float2 square[6] = {
 };
 
 [shader ("vertex")]
-VSOutput main(VSInput input, uint vertex_index : SV_VertexID) {
+VSOutput main(VSInput input, uniform float4x4 proj) {
     VSOutput output;
 
-    float2 vertex_pos = square[vertex_index % 6];
+    float2 vertex_pos = square[input.vertex_index % 6];
     float2 final_pos = (vertex_pos * input.scale) + input.pos;
 
-    output.pos = float4(final_pos, 0.0, 1.0);
+    output.pos = mul(proj, float4(final_pos, 0.0, 1.0));
     output.uv = input.uv;
     output.color = input.color;
     output.alpha = input.alpha;