Electroblob77
249 lines
11 KiB
Java
249 lines
11 KiB
Java
package electroblob.wizardry.client.renderer.effect;
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import electroblob.wizardry.Wizardry;
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import electroblob.wizardry.potion.PotionContainment;
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import electroblob.wizardry.registry.WizardryPotions;
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import electroblob.wizardry.util.GeometryUtils;
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import net.minecraft.client.Minecraft;
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import net.minecraft.client.renderer.BufferBuilder;
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import net.minecraft.client.renderer.GlStateManager;
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import net.minecraft.client.renderer.OpenGlHelper;
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import net.minecraft.client.renderer.Tessellator;
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import net.minecraft.client.renderer.vertex.DefaultVertexFormats;
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import net.minecraft.entity.player.EntityPlayer;
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import net.minecraft.nbt.NBTUtil;
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import net.minecraft.util.ResourceLocation;
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import net.minecraft.util.math.MathHelper;
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import net.minecraft.util.math.Vec3d;
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import net.minecraftforge.client.event.RenderWorldLastEvent;
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import net.minecraftforge.fml.common.Mod;
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import net.minecraftforge.fml.common.eventhandler.SubscribeEvent;
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import net.minecraftforge.fml.relauncher.Side;
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import org.lwjgl.opengl.GL11;
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@Mod.EventBusSubscriber(Side.CLIENT)
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public class RenderContainmentField {
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private static final ResourceLocation[] TEXTURES = new ResourceLocation[8];
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private static final float ANIMATION_SPEED = 0.004f;
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private static final float FADE_DISTANCE_SQUARED = 15;
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static {
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for(int i = 0; i< TEXTURES.length; i++){
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TEXTURES[i] = new ResourceLocation(Wizardry.MODID, "textures/environment/containment_field_" + i + ".png");
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}
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}
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@SubscribeEvent
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public static void onRenderWorldLastEvent(RenderWorldLastEvent event){
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EntityPlayer player = Minecraft.getMinecraft().player;
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if(player.isPotionActive(WizardryPotions.containment)){
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Vec3d centre = GeometryUtils.getCentre(NBTUtil.getPosFromTag(player.getEntityData().getCompoundTag(PotionContainment.ENTITY_TAG)));
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float r = PotionContainment.getContainmentDistance(player.getActivePotionEffect(WizardryPotions.containment).getAmplifier());
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GlStateManager.pushMatrix();
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GlStateManager.enableBlend();
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GlStateManager.shadeModel(GL11.GL_SMOOTH); // Allows the vertex colours to produce a gradient
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GlStateManager.disableLighting();
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OpenGlHelper.setLightmapTextureCoords(OpenGlHelper.lightmapTexUnit, 240, 240);
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GlStateManager.blendFunc(GL11.GL_SRC_ALPHA, GL11.GL_ONE_MINUS_SRC_ALPHA);
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// Enables tiling (Also used for guardian beam, beacon beam and ender crystal beam)
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GlStateManager.glTexParameteri(GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_WRAP_S, GL11.GL_REPEAT);
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GlStateManager.glTexParameteri(GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_WRAP_T, GL11.GL_REPEAT);
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// Translate the texture in the 2D space (like the creeper charge layer)
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GlStateManager.matrixMode(GL11.GL_TEXTURE);
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GlStateManager.loadIdentity();
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float distance = (player.ticksExisted + event.getPartialTicks()) * ANIMATION_SPEED;
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GlStateManager.translate(distance, distance, 0);
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GlStateManager.matrixMode(GL11.GL_MODELVIEW);
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GlStateManager.color(1, 1, 1, 1);
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Minecraft.getMinecraft().renderEngine.bindTexture(TEXTURES[(player.ticksExisted % (TEXTURES.length * 2))/2]);
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Tessellator tessellator = Tessellator.getInstance();
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// The aim here is to have only the bits of the containment field near the player be visible (if any).
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// There's probably a really neat, advanced way of doing this with OpenGL (stencil buffer...?) but in the
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// absence of OpenGL skills, I've devised a cheat which kinda achieves the effect we want:
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// - Split each face of the cube into four, where the split point is taken orthogonal to the player (the
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// player is taken as (0, 0, 0) for simplicity, unlike most render classes where the entire thing is
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// translated first)
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// - Then have the alpha value for each vertex change based on its distance from the player
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// - N.B. OpenGL renders quads as two triangles, with the 1st and 3rd vertices forming the line between them.
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// This causes weirdness in the interpolation since the interpolation isn't taking the whole square into
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// account. The order of the vertices below ensures that the seams between the triangles form an X shape
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// on each of the faces, meaning that you always see a square shape appear rather than a random polygon.
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Vec3d relative = centre.subtract(player.getPositionEyes(event.getPartialTicks())).add(0, player.getEyeHeight(), 0);
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double x1 = relative.x - r;
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double y1 = relative.y - r;
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double z1 = relative.z - r;
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double x2 = relative.x + r;
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double y2 = relative.y + r;
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double z2 = relative.z + r;
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float alpha = Math.min(1, player.getActivePotionEffect(WizardryPotions.containment).getDuration() / 40f);
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BufferBuilder buffer = tessellator.getBuffer();
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buffer.begin(GL11.GL_QUADS, DefaultVertexFormats.POSITION_TEX_COLOR);
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// The following code is mostly an incomprehensible mess of numbers, but unfortunately without a lot of
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// fancy vector stuff it has to be like this, and besides, this is faster!
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// Bottom
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drawVertex(buffer, x1, y1, z1, 0, 0, alpha);
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drawVertex(buffer, x1, y1, 0, 0, -(float)z1, alpha);
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drawVertex(buffer, 0, y1, 0, -(float)x1, -(float)z1, alpha);
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drawVertex(buffer, 0, y1, z1, -(float)x1, 0, alpha);
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drawVertex(buffer, 0, y1, 0, -(float)x1, -(float)z1, alpha);
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drawVertex(buffer, x2, y1, 0, 2*r, -(float)z1, alpha);
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drawVertex(buffer, x2, y1, z1, 2*r, 0, alpha);
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drawVertex(buffer, 0, y1, z1, -(float)x1, 0, alpha);
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drawVertex(buffer, x1, y1, z2, 0, 2*r, alpha);
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drawVertex(buffer, 0, y1, z2, -(float)x1, 2*r, alpha);
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drawVertex(buffer, 0, y1, 0, -(float)x1, -(float)z1, alpha);
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drawVertex(buffer, x1, y1, 0, 0, -(float)z1, alpha);
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drawVertex(buffer, 0, y1, 0, -(float)x1, -(float)z1, alpha);
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drawVertex(buffer, 0, y1, z2, -(float)x1, 2*r, alpha);
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drawVertex(buffer, x2, y1, z2, 2*r, 2*r, alpha);
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drawVertex(buffer, x2, y1, 0, 2*r, -(float)z1, alpha);
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// Top
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drawVertex(buffer, x1, y2, z1, 0, 0, alpha);
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drawVertex(buffer, 0, y2, z1, -(float)x1, 0, alpha);
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drawVertex(buffer, 0, y2, 0, -(float)x1, -(float)z1, alpha);
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drawVertex(buffer, x1, y2, 0, 0, -(float)z1, alpha);
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drawVertex(buffer, x2, y2, z1, 2*r, 0, alpha);
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drawVertex(buffer, x2, y2, 0, 2*r, -(float)z1, alpha);
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drawVertex(buffer, 0, y2, 0, -(float)x1, -(float)z1, alpha);
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drawVertex(buffer, 0, y2, z1, -(float)x1, 0, alpha);
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drawVertex(buffer, 0, y2, 0, -(float)x1, -(float)z1, alpha);
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drawVertex(buffer, 0, y2, z2, -(float)x1, 2*r, alpha);
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drawVertex(buffer, x1, y2, z2, 0, 2*r, alpha);
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drawVertex(buffer, x1, y2, 0, 0, -(float)z1, alpha);
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drawVertex(buffer, 0, y2, 0, -(float)x1, -(float)z1, alpha);
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drawVertex(buffer, x2, y2, 0, 2*r, -(float)z1, alpha);
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drawVertex(buffer, x2, y2, z2, 2*r, 2*r, alpha);
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drawVertex(buffer, 0, y2, z2, -(float)x1, 2*r, alpha);
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// North
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drawVertex(buffer, x1, y1, z1, 0, 0, alpha);
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drawVertex(buffer, 0, y1, z1, -(float)x1, 0, alpha);
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drawVertex(buffer, 0, 0, z1, -(float)x1, -(float)y1, alpha);
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drawVertex(buffer, x1, 0, z1, 0, -(float)y1, alpha);
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drawVertex(buffer, x2, y1, z1, 2*r, 0, alpha);
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drawVertex(buffer, x2, 0, z1, 2*r, -(float)y1, alpha);
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drawVertex(buffer, 0, 0, z1, -(float)x1, -(float)y1, alpha);
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drawVertex(buffer, 0, y1, z1, -(float)x1, 0, alpha);
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drawVertex(buffer, 0, 0, z1, -(float)x1, -(float)y1, alpha);
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drawVertex(buffer, 0, y2, z1, -(float)x1, 2*r, alpha);
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drawVertex(buffer, x1, y2, z1, 0, 2*r, alpha);
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drawVertex(buffer, x1, 0, z1, 0, -(float)y1, alpha);
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drawVertex(buffer, 0, 0, z1, -(float)x1, -(float)y1, alpha);
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drawVertex(buffer, x2, 0, z1, 2*r, -(float)y1, alpha);
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drawVertex(buffer, x2, y2, z1, 2*r, 2*r, alpha);
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drawVertex(buffer, 0, y2, z1, -(float)x1, 2*r, alpha);
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// South
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drawVertex(buffer, x1, y1, z2, 0, 0, alpha);
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drawVertex(buffer, x1, 0, z2, 0, -(float)y1, alpha);
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drawVertex(buffer, 0, 0, z2, -(float)x1, -(float)y1, alpha);
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drawVertex(buffer, 0, y1, z2, -(float)x1, 0, alpha);
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drawVertex(buffer, 0, 0, z2, -(float)x1, -(float)y1, alpha);
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drawVertex(buffer, x2, 0, z2, 2*r, -(float)y1, alpha);
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drawVertex(buffer, x2, y1, z2, 2*r, 0, alpha);
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drawVertex(buffer, 0, y1, z2, -(float)x1, 0, alpha);
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drawVertex(buffer, x1, y2, z2, 0, 2*r, alpha);
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drawVertex(buffer, 0, y2, z2, -(float)x1, 2*r, alpha);
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drawVertex(buffer, 0, 0, z2, -(float)x1, -(float)y1, alpha);
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drawVertex(buffer, x1, 0, z2, 0, -(float)y1, alpha);
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drawVertex(buffer, 0, 0, z2, -(float)x1, -(float)y1, alpha);
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drawVertex(buffer, 0, y2, z2, -(float)x1, 2*r, alpha);
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drawVertex(buffer, x2, y2, z2, 2*r, 2*r, alpha);
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drawVertex(buffer, x2, 0, z2, 2*r, -(float)y1, alpha);
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// West
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drawVertex(buffer, x1, y1, z1, 0, 0, alpha);
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drawVertex(buffer, x1, 0, z1, 0, -(float)y1, alpha);
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drawVertex(buffer, x1, 0, 0, -(float)z1, -(float)y1, alpha);
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drawVertex(buffer, x1, y1, 0, -(float)z1, 0, alpha);
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drawVertex(buffer, x1, 0, 0, -(float)z1, -(float)y1, alpha);
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drawVertex(buffer, x1, 0, z2, 2*r, -(float)y1, alpha);
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drawVertex(buffer, x1, y1, z2, 2*r, 0, alpha);
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drawVertex(buffer, x1, y1, 0, -(float)z1, 0, alpha);
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drawVertex(buffer, x1, y2, z1, 0, 2*r, alpha);
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drawVertex(buffer, x1, y2, 0, -(float)z1, 2*r, alpha);
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drawVertex(buffer, x1, 0, 0, -(float)z1, -(float)y1, alpha);
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drawVertex(buffer, x1, 0, z1, 0, -(float)y1, alpha);
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drawVertex(buffer, x1, 0, 0, -(float)z1, -(float)y1, alpha);
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drawVertex(buffer, x1, y2, 0, -(float)z1, 2*r, alpha);
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drawVertex(buffer, x1, y2, z2, 2*r, 2*r, alpha);
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drawVertex(buffer, x1, 0, z2, 2*r, -(float)y1, alpha);
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// East
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drawVertex(buffer, x2, y1, z1, 0, 0, alpha);
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drawVertex(buffer, x2, y1, 0, -(float)z1, 0, alpha);
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drawVertex(buffer, x2, 0, 0, -(float)z1, -(float)y1, alpha);
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drawVertex(buffer, x2, 0, z1, 0, -(float)y1, alpha);
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drawVertex(buffer, x2, y1, z2, 2*r, 0, alpha);
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drawVertex(buffer, x2, 0, z2, 2*r, -(float)y1, alpha);
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drawVertex(buffer, x2, 0, 0, -(float)z1, -(float)y1, alpha);
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drawVertex(buffer, x2, y1, 0, -(float)z1, 0, alpha);
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drawVertex(buffer, x2, 0, 0, -(float)z1, -(float)y1, alpha);
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drawVertex(buffer, x2, y2, 0, -(float)z1, 2*r, alpha);
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drawVertex(buffer, x2, y2, z1, 0, 2*r, alpha);
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drawVertex(buffer, x2, 0, z1, 0, -(float)y1, alpha);
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drawVertex(buffer, x2, 0, 0, -(float)z1, -(float)y1, alpha);
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drawVertex(buffer, x2, 0, z2, 2*r, -(float)y1, alpha);
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drawVertex(buffer, x2, y2, z2, 2*r, 2*r, alpha);
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drawVertex(buffer, x2, y2, 0, -(float)z1, 2*r, alpha);
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tessellator.draw();
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// Undoes the texture translation
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GlStateManager.matrixMode(GL11.GL_TEXTURE);
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GlStateManager.loadIdentity();
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GlStateManager.matrixMode(GL11.GL_MODELVIEW);
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GlStateManager.disableBlend();
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GlStateManager.enableTexture2D();
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GlStateManager.enableLighting();
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GlStateManager.disableRescaleNormal();
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GlStateManager.popMatrix();
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}
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}
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private static void drawVertex(BufferBuilder buffer, double x, double y, double z, float u, float v, float alpha){
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float f = MathHelper.clamp(1 - (float)(x*x + y*y + z*z) / FADE_DISTANCE_SQUARED, 0, 1);
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buffer.pos(x, y, z).tex(u, v).color(1, 1, 1, f * alpha).endVertex();
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}
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}
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