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Add Hud Render Events #4119

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import net.fabricmc.fabric.api.event.Event;
import net.fabricmc.fabric.api.event.EventFactory;

/**
* @deprecated Use {@link HudRenderEvents} instead. For the closest equivalent, use {@link HudRenderEvents#LAST}.
*/
@Deprecated
public interface HudRenderCallback {
Event<HudRenderCallback> EVENT = EventFactory.createArrayBacked(HudRenderCallback.class, (listeners) -> (matrixStack, delta) -> {
Event<HudRenderCallback> EVENT = EventFactory.createArrayBacked(HudRenderCallback.class, (listeners) -> (context, tickCounter) -> {
for (HudRenderCallback event : listeners) {
event.onHudRender(matrixStack, delta);
event.onHudRender(context, tickCounter);
}
});

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/*
* Copyright (c) 2016, 2017, 2018, 2019 FabricMC
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/

package net.fabricmc.fabric.api.client.rendering.v1;

import net.minecraft.client.MinecraftClient;
import net.minecraft.client.gui.DrawContext;
import net.minecraft.client.render.RenderTickCounter;

import net.fabricmc.fabric.api.event.Event;
import net.fabricmc.fabric.api.event.EventFactory;

/**
* Events for rendering elements on the HUD.
*
* <p>These events will not be called if the HUD is hidden with F1.
*/
public final class HudRenderEvents {
/**
* Called at the start of HUD rendering, right before anything is rendered.
*/
public static final Event<Start> START = EventFactory.createArrayBacked(Start.class, listeners -> (client, context, tickCounter) -> {
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Are events like this the best solution here? Would it be better to allow mods to register their own LayeredDrawer.Layer in a similar way to how the vanilla hud elements work?

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I have updated the code to use one interface, but I don't see a difference with registration methods. Wouldn't it still be implemented with an event?

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I was thinking they could just be static? I dont think there is a need for an even unless im missing something.

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I was under the impression that not using events is more complicated than just using events? So there's no need for registration methods? Are you saying just implement it with a synchronized list? Events also allow phase ordering if some mod wants to render before another.

for (Start listener : listeners) {
listener.onHudStart(client, context, tickCounter);
}
});

/**
* Called after misc overlays (vignette, spyglass, and powder snow) have been rendered, and before the crosshair is rendered.
*/
public static final Event<AfterMiscOverlays> AFTER_MISC_OVERLAYS = EventFactory.createArrayBacked(AfterMiscOverlays.class, listeners -> (client, context, tickCounter) -> {
for (AfterMiscOverlays listener : listeners) {
listener.afterMiscOverlays(client, context, tickCounter);
}
});

/**
* Called after the hotbar, status bars, and experience bar have been rendered, and before the status effects overlays are rendered.
*/
public static final Event<AfterMainHud> AFTER_MAIN_HUD = EventFactory.createArrayBacked(AfterMainHud.class, listeners -> (client, context, tickCounter) -> {
for (AfterMainHud listener : listeners) {
listener.afterMainHud(client, context, tickCounter);
}
});

/**
* Called after the debug HUD, scoreboard, overlay message (action bar), and title and subtitle have been rendered, and before the {@link net.minecraft.client.gui.hud.ChatHud} is rendered.
*/
public static final Event<BeforeChat> BEFORE_CHAT = EventFactory.createArrayBacked(BeforeChat.class, listeners -> (client, context, tickCounter) -> {
for (BeforeChat listener : listeners) {
listener.beforeChat(client, context, tickCounter);
}
});

/**
* Called after the entire HUD is rendered.
*/
public static final Event<Last> LAST = EventFactory.createArrayBacked(Last.class, listeners -> (client, context, tickCounter) -> {
for (Last listener : listeners) {
listener.onHudLast(client, context, tickCounter);
}
});

private HudRenderEvents() { }

@FunctionalInterface
public interface Start {
/**
* Called at the start of HUD rendering, right before anything is rendered.
*
* @param client the {@link MinecraftClient} instance
* @param context the {@link DrawContext} instance
* @param tickCounter the {@link RenderTickCounter} instance with access to tick delta
*/
void onHudStart(MinecraftClient client, DrawContext context, RenderTickCounter tickCounter);
}

@FunctionalInterface
public interface AfterMiscOverlays {
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/**
* Called after misc overlays (vignette, spyglass, and powder snow) have been rendered, and before the crosshair is rendered.
*
* @param client the {@link MinecraftClient} instance
* @param context the {@link DrawContext} instance
* @param tickCounter the {@link RenderTickCounter} instance with access to tick delta
*/
void afterMiscOverlays(MinecraftClient client, DrawContext context, RenderTickCounter tickCounter);
}

@FunctionalInterface
public interface AfterMainHud {
/**
* Called after the hotbar, status bars, and experience bar have been rendered, and before the status effects overlays are rendered.
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*
* @param client the {@link MinecraftClient} instance
* @param context the {@link DrawContext} instance
* @param tickCounter the {@link RenderTickCounter} instance with access to tick delta
*/
void afterMainHud(MinecraftClient client, DrawContext context, RenderTickCounter tickCounter);
}

@FunctionalInterface
public interface BeforeChat {
/**
* Called after the debug HUD, scoreboard, overlay message (action bar), and title and subtitle have been rendered, and before the {@link net.minecraft.client.gui.hud.ChatHud} is rendered.
*
* @param client the {@link MinecraftClient} instance
* @param context the {@link DrawContext} instance
* @param tickCounter the {@link RenderTickCounter} instance with access to tick delta
*/
void beforeChat(MinecraftClient client, DrawContext context, RenderTickCounter tickCounter);
}
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@FunctionalInterface
public interface Last {
/**
* Called after the entire HUD is rendered.
*
* @param client the {@link MinecraftClient} instance
* @param context the {@link DrawContext} instance
* @param tickCounter the {@link RenderTickCounter} instance with access to tick delta
*/
void onHudLast(MinecraftClient client, DrawContext context, RenderTickCounter tickCounter);
}
}
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package net.fabricmc.fabric.mixin.client.rendering;

import org.spongepowered.asm.mixin.Final;
import org.spongepowered.asm.mixin.Mixin;
import org.spongepowered.asm.mixin.Shadow;
import org.spongepowered.asm.mixin.injection.At;
import org.spongepowered.asm.mixin.injection.Inject;
import org.spongepowered.asm.mixin.injection.ModifyArg;
import org.spongepowered.asm.mixin.injection.Slice;
import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;

import net.minecraft.client.MinecraftClient;
import net.minecraft.client.gui.DrawContext;
import net.minecraft.client.gui.LayeredDrawer;
import net.minecraft.client.gui.hud.InGameHud;
import net.minecraft.client.render.RenderTickCounter;

import net.fabricmc.fabric.api.client.rendering.v1.HudRenderCallback;
import net.fabricmc.fabric.api.client.rendering.v1.HudRenderEvents;

@Mixin(InGameHud.class)
public class InGameHudMixin {
@Shadow
@Final
private MinecraftClient client;

@ModifyArg(method = "<init>", at = @At(value = "INVOKE", target = "Lnet/minecraft/client/gui/LayeredDrawer;addLayer(Lnet/minecraft/client/gui/LayeredDrawer$Layer;)Lnet/minecraft/client/gui/LayeredDrawer;", ordinal = 0))
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private LayeredDrawer.Layer fabric$beforeStartAndAfterMiscOverlays(LayeredDrawer.Layer miscOverlaysLayer) {
return (context, tickCounter) -> {
HudRenderEvents.START.invoker().onHudStart(client, context, tickCounter);
miscOverlaysLayer.render(context, tickCounter);
HudRenderEvents.AFTER_MISC_OVERLAYS.invoker().afterMiscOverlays(client, context, tickCounter);
};
}

@ModifyArg(method = "<init>", at = @At(value = "INVOKE", target = "Lnet/minecraft/client/gui/LayeredDrawer;addLayer(Lnet/minecraft/client/gui/LayeredDrawer$Layer;)Lnet/minecraft/client/gui/LayeredDrawer;", ordinal = 3))
private LayeredDrawer.Layer fabric$afterMainHudAndExperienceLevel(LayeredDrawer.Layer experienceLevelLayer) {
return (context, tickCounter) -> {
experienceLevelLayer.render(context, tickCounter);
HudRenderEvents.AFTER_MAIN_HUD.invoker().afterMainHud(client, context, tickCounter);
};
}

@ModifyArg(method = "<init>", slice = @Slice(from = @At(value = "NEW", target = "Lnet/minecraft/client/gui/LayeredDrawer;", ordinal = 2)), at = @At(value = "INVOKE", target = "Lnet/minecraft/client/gui/LayeredDrawer;addLayer(Lnet/minecraft/client/gui/LayeredDrawer$Layer;)Lnet/minecraft/client/gui/LayeredDrawer;", ordinal = 5))
private LayeredDrawer.Layer fabric$beforeChat(LayeredDrawer.Layer beforeChatLayer) {
return (context, tickCounter) -> {
HudRenderEvents.BEFORE_CHAT.invoker().beforeChat(client, context, tickCounter);
beforeChatLayer.render(context, tickCounter);
};
}

@ModifyArg(method = "<init>", slice = @Slice(from = @At(value = "NEW", target = "Lnet/minecraft/client/gui/LayeredDrawer;", ordinal = 2)), at = @At(value = "INVOKE", target = "Lnet/minecraft/client/gui/LayeredDrawer;addLayer(Lnet/minecraft/client/gui/LayeredDrawer$Layer;)Lnet/minecraft/client/gui/LayeredDrawer;", ordinal = 7))
private LayeredDrawer.Layer fabric$AfterSubtitlesHud(LayeredDrawer.Layer subtitlesHudLayer) {
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return (context, tickCounter) -> {
subtitlesHudLayer.render(context, tickCounter);
HudRenderEvents.LAST.invoker().onHudLast(client, context, tickCounter);
};
}

@Deprecated
@Inject(method = "render", at = @At(value = "TAIL"))
public void render(DrawContext drawContext, RenderTickCounter tickCounter, CallbackInfo callbackInfo) {
HudRenderCallback.EVENT.invoker().onHudRender(drawContext, tickCounter);
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1 change: 1 addition & 0 deletions fabric-rendering-v1/src/testmod/resources/fabric.mod.json
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"net.fabricmc.fabric.test.rendering.client.DimensionalRenderingTest",
"net.fabricmc.fabric.test.rendering.client.FeatureRendererTest",
"net.fabricmc.fabric.test.rendering.client.HudAndShaderTest",
"net.fabricmc.fabric.test.rendering.client.HudRenderEventsTests",
"net.fabricmc.fabric.test.rendering.client.TooltipComponentTests",
"net.fabricmc.fabric.test.rendering.client.WorldRenderEventsTests"
]
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/*
* Copyright (c) 2016, 2017, 2018, 2019 FabricMC
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/

package net.fabricmc.fabric.test.rendering.client;

import net.minecraft.client.MinecraftClient;
import net.minecraft.util.Colors;

import net.fabricmc.api.ClientModInitializer;
import net.fabricmc.fabric.api.client.rendering.v1.HudRenderEvents;

public class HudRenderEventsTests implements ClientModInitializer {
@Override
public void onInitializeClient() {
// Render a blue rectangle at the top right of the screen, and it should be blocked by misc overlays such as vignette, spyglass, and powder snow
HudRenderEvents.START.register((client, context, tickCounter) -> {
context.fill(context.getScaledWindowWidth() - 200, 0, context.getScaledWindowWidth(), 30, Colors.BLUE);
context.drawTextWithShadow(MinecraftClient.getInstance().textRenderer, "1. Blue rectangle blocked by overlays", context.getScaledWindowWidth() - 196, 10, Colors.WHITE);
context.drawTextWithShadow(MinecraftClient.getInstance().textRenderer, "such as powder snow", context.getScaledWindowWidth() - 111, 20, Colors.WHITE);
});
// Render a red square in the center of the screen underneath the crosshair
HudRenderEvents.AFTER_MISC_OVERLAYS.register((client, context, tickCounter) -> {
context.fill(context.getScaledWindowWidth() / 2 - 10, context.getScaledWindowHeight() / 2 - 10, context.getScaledWindowWidth() / 2 + 10, context.getScaledWindowHeight() / 2 + 10, Colors.RED);
context.drawCenteredTextWithShadow(MinecraftClient.getInstance().textRenderer, "2. Red square underneath crosshair", context.getScaledWindowWidth() / 2, context.getScaledWindowHeight() / 2 + 10, Colors.WHITE);
});
// Render a green rectangle at the bottom of the screen, and it should block the hotbar and status bars
HudRenderEvents.AFTER_MAIN_HUD.register((client, context, tickCounter) -> {
context.fill(context.getScaledWindowWidth() / 2 - 50, context.getScaledWindowHeight() - 50, context.getScaledWindowWidth() / 2 + 50, context.getScaledWindowHeight() - 10, Colors.GREEN);
context.drawCenteredTextWithShadow(MinecraftClient.getInstance().textRenderer, "3. This green rectangle should block the hotbar and status bars.", context.getScaledWindowWidth() / 2, context.getScaledWindowHeight() - 40, Colors.WHITE);
});
// Render a blue rectangle at the bottom left of the screen, and it should be blocked by the chat
HudRenderEvents.BEFORE_CHAT.register((client, context, tickCounter) -> {
context.fill(0, context.getScaledWindowHeight() - 40, 300, context.getScaledWindowHeight() - 50, Colors.BLUE);
context.drawTextWithShadow(MinecraftClient.getInstance().textRenderer, "4. This blue rectangle should be blocked by the chat.", 0, context.getScaledWindowHeight() - 50, Colors.WHITE);
});
// Render a yellow rectangle at the top of the screen, and it should block the player list
HudRenderEvents.LAST.register((client, context, tickCounter) -> {
context.fill(context.getScaledWindowWidth() / 2 - 150, 0, context.getScaledWindowWidth() / 2 + 150, 15, Colors.YELLOW);
context.drawCenteredTextWithShadow(MinecraftClient.getInstance().textRenderer, "5. This yellow rectangle should block the player list.", context.getScaledWindowWidth() / 2, 0, Colors.WHITE);
});
}
}
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