Java tutorial
package mattparks.mods.starcraft.mercury.client; import java.util.Random; import mattparks.mods.starcraft.mercury.MercuryCore; import mattparks.mods.starcraft.mercury.dimension.SCMercuryWorldProvider; import micdoodle8.mods.galacticraft.core.GCCoreConfigManager; import net.minecraft.client.Minecraft; import net.minecraft.client.multiplayer.WorldClient; import net.minecraft.client.renderer.GLAllocation; import net.minecraft.client.renderer.RenderHelper; import net.minecraft.client.renderer.Tessellator; import net.minecraft.util.MathHelper; import net.minecraft.util.ResourceLocation; import net.minecraft.util.Vec3; import net.minecraftforge.client.IRenderHandler; import org.lwjgl.opengl.GL11; import cpw.mods.fml.client.FMLClientHandler; /** * This file is part of the 4-Space project * * @author mattparks * @license Lesser GNU Public License v3 (http://www.gnu.org/licenses/lgpl.html) * */ public class SCMercurySkyProvider extends IRenderHandler { private static final ResourceLocation venusTexture = new ResourceLocation(MercuryCore.ASSET_DOMAIN, "textures/gui/planets/venus.png"); private static final ResourceLocation sunTexture = new ResourceLocation(MercuryCore.ASSET_DOMAIN, "textures/gui/planets/sun.png"); public int starGLCallList = GLAllocation.generateDisplayLists(3); public int glSkyList; public int glSkyList2; public SCMercurySkyProvider() { GL11.glPushMatrix(); GL11.glNewList(this.starGLCallList, GL11.GL_COMPILE); this.renderStars(); GL11.glEndList(); GL11.glPopMatrix(); final Tessellator tessellator = Tessellator.instance; this.glSkyList = this.starGLCallList + 1; GL11.glNewList(this.glSkyList, GL11.GL_COMPILE); final byte byte2 = 64; final int i = 256 / byte2 + 2; float f = 16F; for (int j = -byte2 * i; j <= byte2 * i; j += byte2) { for (int l = -byte2 * i; l <= byte2 * i; l += byte2) { tessellator.startDrawingQuads(); tessellator.addVertex(j + 0, f, l + 0); tessellator.addVertex(j + byte2, f, l + 0); tessellator.addVertex(j + byte2, f, l + byte2); tessellator.addVertex(j + 0, f, l + byte2); tessellator.draw(); } } GL11.glEndList(); this.glSkyList2 = this.starGLCallList + 2; GL11.glNewList(this.glSkyList2, GL11.GL_COMPILE); f = -16F; tessellator.startDrawingQuads(); for (int k = -byte2 * i; k <= byte2 * i; k += byte2) { for (int i1 = -byte2 * i; i1 <= byte2 * i; i1 += byte2) { tessellator.addVertex(k + byte2, f, i1 + 0); tessellator.addVertex(k + 0, f, i1 + 0); tessellator.addVertex(k + 0, f, i1 + byte2); tessellator.addVertex(k + byte2, f, i1 + byte2); } } tessellator.draw(); GL11.glEndList(); } private Vec3 getCustomSkyColor() { return Vec3.fakePool.getVecFromPool(0.26796875D, 0.1796875D, 0.0D); } public float getSkyBrightness(float par1) { final float var2 = FMLClientHandler.instance().getClient().theWorld.getCelestialAngle(par1); float var3 = 1.0F - (MathHelper.sin(var2 * (float) Math.PI * 2.0F) * 2.0F + 0.25F); if (var3 < 0.0F) { var3 = 0.0F; } if (var3 > 1.0F) { var3 = 1.0F; } return var3 * var3 * 1F; } @Override public void render(float partialTicks, WorldClient world, Minecraft mc) { SCMercuryWorldProvider gcProvider = null; if (world.provider instanceof SCMercuryWorldProvider) { gcProvider = (SCMercuryWorldProvider) world.provider; } float var10; float var11; float var12; final Tessellator var23 = Tessellator.instance; GL11.glDisable(GL11.GL_TEXTURE_2D); final Vec3 var2 = this.getCustomSkyColor(); float var3 = (float) var2.xCoord * (1 - world.getStarBrightness(partialTicks) * 2); float var4 = (float) var2.yCoord * (1 - world.getStarBrightness(partialTicks) * 2); float var5 = (float) var2.zCoord * (1 - world.getStarBrightness(partialTicks) * 2); float var8; if (mc.gameSettings.anaglyph) { final float var6 = (var3 * 30.0F + var4 * 59.0F + var5 * 11.0F) / 100.0F; final float var7 = (var3 * 30.0F + var4 * 70.0F) / 100.0F; var8 = (var3 * 30.0F + var5 * 70.0F) / 100.0F; var3 = var6; var4 = var7; var5 = var8; } GL11.glColor3f(1, 1, 1); GL11.glDepthMask(false); GL11.glEnable(GL11.GL_FOG); GL11.glColor3f(0, 0, 0); GL11.glCallList(this.glSkyList); GL11.glDisable(GL11.GL_FOG); GL11.glDisable(GL11.GL_ALPHA_TEST); GL11.glEnable(GL11.GL_BLEND); GL11.glBlendFunc(GL11.GL_SRC_ALPHA, GL11.GL_ONE_MINUS_SRC_ALPHA); RenderHelper.disableStandardItemLighting(); float var20 = 0; if (gcProvider != null) { var20 = gcProvider.getStarBrightness(partialTicks); } GL11.glPushMatrix(); GL11.glDisable(GL11.GL_BLEND); GL11.glEnable(GL11.GL_TEXTURE_2D); GL11.glColor4f(1.0F, 1.0F, 1.0F, 1.0F); GL11.glDisable(GL11.GL_BLEND); GL11.glEnable(GL11.GL_ALPHA_TEST); GL11.glEnable(GL11.GL_FOG); GL11.glPopMatrix(); if (var20 > 0.0F) { GL11.glDisable(GL11.GL_TEXTURE_2D); GL11.glColor4f(1.0F, 1.0F, 1.0F, var20); GL11.glCallList(this.starGLCallList); GL11.glEnable(GL11.GL_TEXTURE_2D); } GL11.glEnable(GL11.GL_BLEND); GL11.glBlendFunc(GL11.GL_SRC_ALPHA, GL11.GL_ONE); GL11.glPushMatrix(); // Sun: GL11.glRotatef(-90.0F, 0.0F, 1.0F, 0.0F); GL11.glColor4f(1.0F, 1.0F, 1.0F, 1.0F); GL11.glRotatef(world.getCelestialAngle(partialTicks) * 360.0F, 1.0F, 0.0F, 0.0F); var12 = 30.0F; FMLClientHandler.instance().getClient().renderEngine.bindTexture(SCMercurySkyProvider.sunTexture); var23.startDrawingQuads(); var23.addVertexWithUV(-var12, 150.0D, -var12, 0.0D, 0.0D); var23.addVertexWithUV(var12, 150.0D, -var12, 1.0D, 0.0D); var23.addVertexWithUV(var12, 150.0D, var12, 1.0D, 1.0D); var23.addVertexWithUV(-var12, 150.0D, var12, 0.0D, 1.0D); var23.draw(); GL11.glPopMatrix(); GL11.glPushMatrix(); GL11.glDisable(GL11.GL_BLEND); // OVERWORLD: var12 = 0.5F; GL11.glScalef(0.6F, 0.6F, 0.6F); GL11.glRotatef(40.0F, 0.0F, 0.0F, 1.0F); GL11.glRotatef(200F, 1.0F, 0.0F, 0.0F); GL11.glColor4f(1.0F, 1.0F, 1.0F, 1F); FMLClientHandler.instance().getClient().renderEngine.bindTexture(SCMercurySkyProvider.venusTexture); var23.startDrawingQuads(); var23.addVertexWithUV(-var12, -100.0D, var12, 0, 1); var23.addVertexWithUV(var12, -100.0D, var12, 1, 1); var23.addVertexWithUV(var12, -100.0D, -var12, 1, 0); var23.addVertexWithUV(-var12, -100.0D, -var12, 0, 0); var23.draw(); GL11.glColor4f(1.0F, 1.0F, 1.0F, 1.0F); GL11.glDisable(GL11.GL_BLEND); GL11.glEnable(GL11.GL_ALPHA_TEST); GL11.glEnable(GL11.GL_FOG); GL11.glPopMatrix(); GL11.glDisable(GL11.GL_TEXTURE_2D); GL11.glColor3f(0.0F, 0.0F, 0.0F); final double var25 = mc.thePlayer.getPosition(partialTicks).yCoord - world.getHorizon(); if (var25 < 0.0D) { GL11.glPushMatrix(); GL11.glTranslatef(0.0F, 12.0F, 0.0F); GL11.glCallList(this.glSkyList2); GL11.glPopMatrix(); var10 = 1.0F; var11 = -((float) (var25 + 65.0D)); var12 = -var10; var23.startDrawingQuads(); var23.setColorRGBA_I(0, 255); var23.addVertex(-var10, var11, var10); var23.addVertex(var10, var11, var10); var23.addVertex(var10, var12, var10); var23.addVertex(-var10, var12, var10); var23.addVertex(-var10, var12, -var10); var23.addVertex(var10, var12, -var10); var23.addVertex(var10, var11, -var10); var23.addVertex(-var10, var11, -var10); var23.addVertex(var10, var12, -var10); var23.addVertex(var10, var12, var10); var23.addVertex(var10, var11, var10); var23.addVertex(var10, var11, -var10); var23.addVertex(-var10, var11, -var10); var23.addVertex(-var10, var11, var10); var23.addVertex(-var10, var12, var10); var23.addVertex(-var10, var12, -var10); var23.addVertex(-var10, var12, -var10); var23.addVertex(-var10, var12, var10); var23.addVertex(var10, var12, var10); var23.addVertex(var10, var12, -var10); var23.draw(); } GL11.glColor3f(70F / 256F, 70F / 256F, 70F / 256F); GL11.glPushMatrix(); GL11.glTranslatef(0.0F, -((float) (var25 - 16.0D)), 0.0F); GL11.glCallList(this.glSkyList2); GL11.glPopMatrix(); GL11.glEnable(GL11.GL_TEXTURE_2D); GL11.glDepthMask(true); } private void renderStars() { final Random var1 = new Random(10842L); final Tessellator var2 = Tessellator.instance; var2.startDrawingQuads(); for (int var3 = 0; var3 < (GCCoreConfigManager.moreStars ? 35000 : 6000); ++var3) { double var4 = var1.nextFloat() * 2.0F - 1.0F; double var6 = var1.nextFloat() * 2.0F - 1.0F; double var8 = var1.nextFloat() * 2.0F - 1.0F; final double var10 = 0.15F + var1.nextFloat() * 0.1F; double var12 = var4 * var4 + var6 * var6 + var8 * var8; if (var12 < 1.0D && var12 > 0.01D) { var12 = 1.0D / Math.sqrt(var12); var4 *= var12; var6 *= var12; var8 *= var12; final double var14 = var4 * (GCCoreConfigManager.moreStars ? var1.nextDouble() * 150D + 130D : 100.0D); final double var16 = var6 * (GCCoreConfigManager.moreStars ? var1.nextDouble() * 150D + 130D : 100.0D); final double var18 = var8 * (GCCoreConfigManager.moreStars ? var1.nextDouble() * 150D + 130D : 100.0D); final double var20 = Math.atan2(var4, var8); final double var22 = Math.sin(var20); final double var24 = Math.cos(var20); final double var26 = Math.atan2(Math.sqrt(var4 * var4 + var8 * var8), var6); final double var28 = Math.sin(var26); final double var30 = Math.cos(var26); final double var32 = var1.nextDouble() * Math.PI * 2.0D; final double var34 = Math.sin(var32); final double var36 = Math.cos(var32); for (int var38 = 0; var38 < 4; ++var38) { final double var39 = 0.0D; final double var41 = ((var38 & 2) - 1) * var10; final double var43 = ((var38 + 1 & 2) - 1) * var10; final double var47 = var41 * var36 - var43 * var34; final double var49 = var43 * var36 + var41 * var34; final double var53 = var47 * var28 + var39 * var30; final double var55 = var39 * var28 - var47 * var30; final double var57 = var55 * var22 - var49 * var24; final double var61 = var49 * var22 + var55 * var24; var2.addVertex(var14 + var57, var16 + var53, var18 + var61); } } } var2.draw(); } }