Added global depth map to RenderContext 2D

h2d/RenderContext.hx

@@ -188,6 +188,7 @@ class RenderContext extends h3d.impl.RenderContext {
 		inFilter = null;
 		globals.set("time", time);
 		globals.set("global.time", time);
+		globals.set("depthMap", { texture : engine.driver.getDefaultDepthBuffer(), channel : hxsl.Channel.R });
 		baseShader.pixelAlign = false;
 		baseShader.halfPixelInverse.set(0.5 / engine.width, 0.5 / engine.height);
 		baseShader.viewportA.set(scene.viewportA, 0, scene.viewportX);