Create a world-to-screen projection helper
We also grab the view matrix and set up a world rendering hook I needed to use LWJGL 2's util for GLU, but I can probably switch to JOML or something
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4 changed files with 156 additions and 0 deletions
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@ -49,6 +49,8 @@ dependencies {
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}
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implementation("io.github.spair:imgui-java-natives-windows-ft:$imguiVersion")
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implementation(files("vendor/lwjgl-util.jar"))
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runtimeOnly("org.joml:joml:1.10.2")
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runtimeOnly("org.anarres:jcpp:1.4.14")
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modRuntimeOnly(files("vendor/iris-mc1.18.1-1.2.0-pre.jar"))
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@ -0,0 +1,46 @@
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package codes.som.hibiscus.mixins;
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import codes.som.hibiscus.HibiscusMod;
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import codes.som.hibiscus.events.RenderWorldEvent;
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import codes.som.hibiscus.util.graphics.WorldToScreenProjection;
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import com.mojang.blaze3d.systems.RenderSystem;
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import net.minecraft.client.MinecraftClient;
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import net.minecraft.client.render.Camera;
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import net.minecraft.client.render.GameRenderer;
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import net.minecraft.client.util.math.MatrixStack;
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import net.minecraft.util.math.Matrix4f;
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import org.spongepowered.asm.mixin.Final;
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import org.spongepowered.asm.mixin.Mixin;
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import org.spongepowered.asm.mixin.Shadow;
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import org.spongepowered.asm.mixin.injection.At;
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import org.spongepowered.asm.mixin.injection.Inject;
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import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
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@Mixin(GameRenderer.class)
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public abstract class MixinGameRenderer {
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@Shadow
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@Final
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private MinecraftClient client;
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@Shadow
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@Final
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private Camera camera;
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@Inject(
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method = "renderWorld(FJLnet/minecraft/client/util/math/MatrixStack;)V",
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at = @At(
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value = "INVOKE_STRING",
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target = "Lnet/minecraft/util/profiler/Profiler;swap(Ljava/lang/String;)V",
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args = "ldc=hand",
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shift = At.Shift.BEFORE))
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private void preRenderHand(float tickDelta, long limitTime, MatrixStack matrices, CallbackInfo ci) {
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Matrix4f modelView = matrices.peek().getModel();
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WorldToScreenProjection.INSTANCE.updateViewport(client.getWindow(), modelView);
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matrices.push();
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RenderSystem.applyModelViewMatrix();
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HibiscusMod.bus().fire(new RenderWorldEvent(tickDelta, this.camera, matrices));
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matrices.pop();
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}
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}
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@ -1,5 +1,8 @@
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package codes.som.hibiscus.events
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import codes.som.hibiscus.api.event.Event
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import net.minecraft.client.render.Camera
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import net.minecraft.client.util.math.MatrixStack
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class PostRenderAllEvent(val delta: Float) : Event
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class RenderWorldEvent(val delta: Float, val camera: Camera, val matrices: MatrixStack) : Event
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@ -0,0 +1,105 @@
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package codes.som.hibiscus.util.graphics
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import codes.som.hibiscus.mc
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import net.minecraft.client.util.GlAllocationUtils
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import net.minecraft.client.util.Window
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import net.minecraft.util.math.MathHelper
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import net.minecraft.util.math.Matrix4f
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import net.minecraft.util.math.Vec3d
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import org.lwjgl.opengl.GL11
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import org.lwjgl.util.glu.Project.gluProject
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import kotlin.math.absoluteValue
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import kotlin.math.sign
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object WorldToScreenProjection {
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private const val PROJECTION_MATRIX_PLANE_RATIO_INDEX = 10
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private const val PROJECTION_MATRIX_FAR_PLANE_INDEX = 14
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private const val VIEWPORT_MATRIX_Y_OFFSET_INDEX = 1
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private const val VIEWPORT_MATRIX_WIDTH_INDEX = 2
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private const val VIEWPORT_MATRIX_HEIGHT_INDEX = 3
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private const val PLANE_RATIO = -1.0f
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private val FAR_PLANE_DISTANCE = -6.0E7f * MathHelper.SQUARE_ROOT_OF_TWO * 2.0f
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private const val WINDOW_POSITION_VECTOR_DIMENSIONALITY = 3
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private const val WINDOW_POSITION_VECTOR_X_INDEX = 0
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private const val WINDOW_POSITION_VECTOR_Y_INDEX = 1
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private const val WINDOW_POSITION_VECTOR_Z_INDEX = 2
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private val VIEWPORT_MATRIX =
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GlAllocationUtils.allocateByteBuffer(4 * Int.SIZE_BYTES).asIntBuffer() // 4x1 matrix of integers
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private val MODEL_MATRIX =
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GlAllocationUtils.allocateByteBuffer(16 * Float.SIZE_BYTES).asFloatBuffer() // 4x4 matrix of floats
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private val PROJECTION_MATRIX =
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GlAllocationUtils.allocateByteBuffer(16 * Float.SIZE_BYTES).asFloatBuffer() // 4x4 matrix of floats
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private val WINDOW_POSITION_VECTOR =
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GlAllocationUtils.allocateByteBuffer(WINDOW_POSITION_VECTOR_DIMENSIONALITY * Float.SIZE_BYTES).asFloatBuffer()
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private var scaledWidth = 0
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private var scaledHeight = 0
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private var cameraX = 0.0
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private var cameraY = 0.0
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private var cameraZ = 0.0
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fun updateViewport(window: Window, modelView: Matrix4f) {
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scaledWidth = window.scaledWidth
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scaledHeight = window.scaledHeight
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val camera = mc.gameRenderer.camera
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val cameraPos = if (camera == null) Vec3d.ZERO else camera.pos
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cameraX = cameraPos.x
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cameraY = cameraPos.y
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cameraZ = cameraPos.z
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modelView.writeRowMajor(MODEL_MATRIX)
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GL11.glGetFloatv(GL11.GL_PROJECTION_MATRIX, PROJECTION_MATRIX)
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PROJECTION_MATRIX.put(PROJECTION_MATRIX_PLANE_RATIO_INDEX, PLANE_RATIO)
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PROJECTION_MATRIX.put(PROJECTION_MATRIX_FAR_PLANE_INDEX, FAR_PLANE_DISTANCE)
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VIEWPORT_MATRIX.put(VIEWPORT_MATRIX_Y_OFFSET_INDEX, scaledHeight)
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VIEWPORT_MATRIX.put(VIEWPORT_MATRIX_WIDTH_INDEX, scaledWidth)
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VIEWPORT_MATRIX.put(VIEWPORT_MATRIX_HEIGHT_INDEX, -scaledHeight)
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}
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fun project(x: Double, y: Double, z: Double, offScreen: Boolean): Vec3d? {
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gluProject(
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(x - cameraX).toFloat(),
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(y - cameraY).toFloat(),
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(z - cameraZ).toFloat(),
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MODEL_MATRIX,
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PROJECTION_MATRIX,
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VIEWPORT_MATRIX,
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WINDOW_POSITION_VECTOR
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)
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var windowX = WINDOW_POSITION_VECTOR[WINDOW_POSITION_VECTOR_X_INDEX]
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var windowY = WINDOW_POSITION_VECTOR[WINDOW_POSITION_VECTOR_Y_INDEX]
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val windowZ = WINDOW_POSITION_VECTOR[WINDOW_POSITION_VECTOR_Z_INDEX]
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if (windowZ > 0) {
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if (!offScreen) {
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return null
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}
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windowX = scaledWidth - windowX
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windowY = scaledHeight - windowY
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var offsetFromCentreWindowX = windowX - scaledWidth / 2
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var offsetFromCentreWindowY = windowY - scaledWidth / 2
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if (offsetFromCentreWindowX.absoluteValue < offsetFromCentreWindowY.absoluteValue) {
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val newWindowXOffset = scaledWidth * offsetFromCentreWindowX.sign
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offsetFromCentreWindowY *= newWindowXOffset / offsetFromCentreWindowX
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offsetFromCentreWindowX = newWindowXOffset
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} else {
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val newWindowYOffset = scaledHeight * offsetFromCentreWindowY.sign
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offsetFromCentreWindowX *= newWindowYOffset / offsetFromCentreWindowY
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offsetFromCentreWindowY = newWindowYOffset
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}
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windowX = scaledWidth / 2 + offsetFromCentreWindowX
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windowY = scaledHeight / 2 + offsetFromCentreWindowY
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}
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return Vec3d(windowX.toDouble(), windowY.toDouble(), windowZ.toDouble())
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}
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}
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