added ui rendering

funnyassets/gfx_shaders/fgui_text_frag.slang

@@ -6,6 +6,10 @@ float4 _main(
 	uint triid: SV_PrimitiveID,
 ) : SV_TARGET
 {
-	return float4(0.2,0.2,0.2,1);
+	float dist =  SampleTexture(font, (input.uv+glyphPos)*glyphSize).x;
+	float smoothing = 0.2;
+	float alpha = smoothstep(0.5-smoothing, 0.5+smoothing, dist);
+	if (alpha<0.01) discard;
+	return float4(color);
 }