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Replace crossed quads arc renderer with new 3D box-based rendering

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Electroblob
2018-04-14 12:51:18 +01:00
parent a1ae3a2b8b
commit f5730bf945
2 changed files with 141 additions and 82 deletions
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src/main/java/electroblob/wizardry/client/renderer/RenderArc.java
+132 -78
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@@ -1,8 +1,9 @@
package electroblob.wizardry.client.renderer;
import java.util.Random;
import org.lwjgl.opengl.GL11;
import electroblob.wizardry.Wizardry;
import electroblob.wizardry.entity.EntityArc;
import net.minecraft.client.renderer.BufferBuilder;
import net.minecraft.client.renderer.GlStateManager;
@@ -15,119 +16,172 @@ import net.minecraft.util.ResourceLocation;
public class RenderArc extends Render<EntityArc> {
private static final ResourceLocation[] textures = new ResourceLocation[16];
public RenderArc(RenderManager renderManager){
super(renderManager);
for(int i = 0; i < 16; i++){
textures[i] = new ResourceLocation(Wizardry.MODID, "textures/entity/arc_" + i + ".png");
}
}
@Override
public void doRender(EntityArc arc, double d0, double d1, double d2, float fa, float fb){
public void doRender(EntityArc arc, double x, double y, double z, float viewPitch, float viewYaw) {
GlStateManager.pushMatrix();
GlStateManager.translate((float)d0, (float)d1, (float)d2);
GlStateManager.translate(x, y, z);
GlStateManager.disableLighting();
GlStateManager.enableBlend();
GlStateManager.blendFunc(GL11.GL_SRC_ALPHA, GL11.GL_ONE_MINUS_SRC_ALPHA); // This line fixes the weird
// brightness bug.
GlStateManager.disableTexture2D();
GlStateManager.blendFunc(GlStateManager.SourceFactor.SRC_ALPHA, GlStateManager.DestFactor.ONE);
OpenGlHelper.setLightmapTextureCoords(OpenGlHelper.lightmapTexUnit, 240f, 240f);
// System.out.println("Entity coords: " + entity.posX + ", " + entity.posY + ", " + entity.posZ);
// System.out.println("doRender parameters: " + d0 + ", " + d1 + ", " + d2 + ", " + fa + ", " + fb);
Tessellator tessellator = Tessellator.getInstance();
BufferBuilder buffer = tessellator.getBuffer();
bindTexture(textures[arc.textureIndex]); // This MUST be after the tessellator declaration and the gl stuff
/**
* Note: A lot of the maths here works on similar triangles and the ratios between them, avoiding too much
/* Note: A lot of the maths here works on similar triangles and the ratios between them, avoiding too much
* pythagoras and eliminating the need for any trig. Ratios are used for the positioning of the arc endpoints.
* Ratios are usually used swapping x and z because the triangles are rotated through 90 degrees.
*/
* Ratios are usually used swapping x and z because the triangles are rotated through 90 degrees. */
double dx = -d0;
double dy = -d1;
double dz = -d2;
double dx = -x;
double dy = -y;
double dz = -z;
if(arc.x1 != 0){
dx = arc.x1 - arc.posX;// - d2/lengthOffsetRatio;
dy = arc.y1 - arc.posY + 0.3;
dz = arc.z1 - arc.posZ;// + d0/lengthOffsetRatio;
// The distance from caster to target
double arcLength = Math.sqrt(dz * dz + dx * dx);
dx = arc.x1 - arc.posX;
dy = arc.y1 - arc.posY;
dz = arc.z1 - arc.posZ;
// The ratio between the length of the arc and the offset of the start point from the player's centre (which
// is always 0.3).
// double lengthOffsetRatio = arcLength/0.3;
// The distance from origin to endpoint
double arcLength = Math.sqrt(dx*dx+dy*dy+dz*dz);
// EntityClientPlayerMP player = Minecraft.getMinecraft().player;
GL11.glTranslated(dx, dy, dz);
// double xViewDist = player.posX - d0;
// double yViewDist = player.posY + player.eyeHeight - d1;
// double zViewDist = player.posZ - d2;
// Math.atan2 computes within -180 to +180, rather than -90 to +90.
float yaw = (float)(180d/Math.PI * Math.atan2(-dx, -dz));
float pitch = (float)(180f/(float)Math.PI * Math.atan(dy/Math.sqrt(dz*dz+dx*dx)));
// double xzViewDist = Math.sqrt(xViewDist * xViewDist + zViewDist * zViewDist);
GL11.glRotatef(yaw, 0, 1, 0);
GL11.glRotatef(pitch, 1, 0, 0);
// The angle above the horizontal that this particular player is viewing the arc from
// double viewAngle = Math.atan(yViewDist/xzViewDist);
// The direction of the arc drawn by the tessellator is always along the z axis and is rotated to the
// correct orientation, that way there isn't a ton of trigonometry and the code is way neater.
// Half the width of the arc
double arcWidth = 0.3d;
boolean freeEnd = arc.freeEnd;
// Right hand side of vertical plane
buffer.begin(GL11.GL_QUADS, DefaultVertexFormats.POSITION_TEX);
// Target end
buffer.pos(0, -0.5, 0).tex(1, 1).endVertex();
buffer.pos(0, 0.5, 0).tex(1, 0).endVertex();
// Caster end
buffer.pos(dx, dy, dz).tex(0, 0).endVertex();
buffer.pos(dx, dy - 1, dz).tex(0, 1).endVertex();
tessellator.draw();
// == To be extracted as constants later ==
float thickness = 0.04f; // Half the width of the outermost layer
double maxSegmentLength = 0.6; // Max length of a segment, obviously
double minSegmentLength = 0.2; // Min length of a segment
double vertexDither = 0.15; // Max deviation in x or y axis from the centreline
int maxForkSegments = 3; // Max number of segments a fork can have
float forkChance = 0.3f; // Chance (as a fraction) that a vertex will have a fork
int updateTime = 1; // Number of ticks to wait before the arc changes shape again
// Left
buffer.begin(GL11.GL_QUADS, net.minecraft.client.renderer.vertex.DefaultVertexFormats.POSITION_TEX);
// Target end
buffer.pos(0, -0.5, 0).tex(1, 1).endVertex();
// Caster end
buffer.pos(dx, dy - 1, dz).tex(0, 1).endVertex();
buffer.pos(dx, dy, dz).tex(0, 0).endVertex();
// Target end
buffer.pos(0, 0.5, 0).tex(1, 0).endVertex();
tessellator.draw();
int numberOfSegments = (int)Math.round(arcLength/maxSegmentLength); // Number of segments
// Bottom of horizontal plane
buffer.begin(GL11.GL_QUADS, net.minecraft.client.renderer.vertex.DefaultVertexFormats.POSITION_TEX);
buffer.pos((arcWidth / arcLength) * dz, 0, (-arcWidth / arcLength) * dx).tex(1, 1).endVertex();
buffer.pos(dx + (arcWidth / arcLength) * dz, dy - 0.5, dz - (arcWidth / arcLength) * dx).tex(0, 1)
.endVertex();
buffer.pos(dx - (arcWidth / arcLength) * dz, dy - 0.5, dz + (arcWidth / arcLength) * dx).tex(0, 0)
.endVertex();
buffer.pos((-arcWidth / arcLength) * dz, 0, (arcWidth / arcLength) * dx).tex(1, 0).endVertex();
tessellator.draw();
for(int layer=0; layer<3; layer++){
// Top
buffer.begin(GL11.GL_QUADS, net.minecraft.client.renderer.vertex.DefaultVertexFormats.POSITION_TEX);
buffer.pos((arcWidth / arcLength) * dz, 0, (-arcWidth / arcLength) * dx).tex(1, 1).endVertex();
buffer.pos((-arcWidth / arcLength) * dz, 0, (arcWidth / arcLength) * dx).tex(1, 0).endVertex();
buffer.pos(dx - (arcWidth / arcLength) * dz, dy - 0.5, dz + (arcWidth / arcLength) * dx).tex(0, 0)
.endVertex();
buffer.pos(dx + (arcWidth / arcLength) * dz, dy - 0.5, dz - (arcWidth / arcLength) * dx).tex(0, 1)
.endVertex();
tessellator.draw();
double px=0, py=0, pz=0;
// Creates a random from the arc's seed field + the number of ticks it has existed/the update period.
// By using a seed, we can ensure the vertex positions and forks are identical a) for each layer, even
// though they are rendered sequentially, and b) across many frames (and ticks, if updateTime > 1).
Random random = new Random(arc.seed + arc.ticksExisted/updateTime);
// numberOfSegments-1 because the last segment is handled separately.
for(int i=0; i<numberOfSegments-1; i++){
double px2 = (random.nextDouble()*2-1)*vertexDither; // Maybe use Gaussians?
double py2 = (random.nextDouble()*2-1)*vertexDither;
double pz2 = pz + arcLength/(double)numberOfSegments; // For now they are all the same length
drawSegment(tessellator, layer, px, py, pz, px2, py2, pz2, thickness);
// Forks
if(random.nextFloat() < forkChance){
double px3=px, py3=py, pz3=pz;
for(int j=0; j<random.nextInt(maxForkSegments-1)+1; j++){
// Forks set their centreline to the x/y coordinates of the vertex they originate from
double px4 = px3 + (random.nextDouble()*2-1)*vertexDither;
double py4 = py3 + (random.nextDouble()*2-1)*vertexDither;
double pz4 = pz3 + minSegmentLength + random.nextDouble()*(maxSegmentLength - minSegmentLength);
drawSegment(tessellator, layer, px3, py3, pz3, px4, py4, pz4, thickness*0.8f);
// Forks of forks
if(random.nextFloat() < forkChance){
double px5 = px3 + (random.nextDouble()*2-1)*vertexDither;
double py5 = py3 + (random.nextDouble()*2-1)*vertexDither;
double pz5 = pz3 + minSegmentLength + random.nextDouble()*(maxSegmentLength - minSegmentLength);
drawSegment(tessellator, layer, px3, py3, pz3, px5, py5, pz5, thickness*0.6f);
}
px3 = px4;
py3 = py4;
pz3 = pz4;
}
}
px = px2;
py = py2;
pz = pz2;
}
// Last segment has a specific end position and cannot fork.
double px2 = freeEnd ? (random.nextDouble()*2-1)*vertexDither : 0;
double py2 = freeEnd ? (random.nextDouble()*2-1)*vertexDither : 0;
drawSegment(tessellator, layer, px, py, pz, px2, py2, arcLength, thickness);
}
}
GlStateManager.enableTexture2D();
GlStateManager.enableLighting();
GlStateManager.disableBlend();
GlStateManager.popMatrix();
}
/** Draws the given layer of a segment of the arc, from the point (x1, y1, z1) to the point (x2, y2, z2), with the given thickness. */
private void drawSegment(Tessellator tessellator, int layer, double x1, double y1, double z1, double x2, double y2, double z2, float thickness){
BufferBuilder buffer = tessellator.getBuffer();
buffer.begin(GL11.GL_TRIANGLE_STRIP, DefaultVertexFormats.POSITION_COLOR);
switch(layer){
case 0:
// TODO: Extract these colours as constants
drawShearedBox(buffer, x1, y1, z1, x2, y2, z2, 0.25f*thickness, 255, 255, 255, 255);
break;
case 1:
drawShearedBox(buffer, x1, y1, z1, x2, y2, z2, 0.6f*thickness, 200, 255, 255, 165);
break;
case 2:
drawShearedBox(buffer, x1, y1, z1, x2, y2, z2, thickness, 50, 150, 255, 75);
break;
}
tessellator.draw();
}
/** Draws a single box for one segment of the arc, from the point (x1, y1, z1) to the point (x2, y2, z2), with given width and colour. */
private void drawShearedBox(BufferBuilder buffer, double x1, double y1, double z1, double x2, double y2, double z2, float width, int r, int g, int b, int a){
buffer.pos(x1-width, y1-width, z1).color(r, g, b, a).endVertex();
buffer.pos(x2-width, y2-width, z2).color(r, g, b, a).endVertex();
buffer.pos(x1-width, y1+width, z1).color(r, g, b, a).endVertex();
buffer.pos(x2-width, y2+width, z2).color(r, g, b, a).endVertex();
buffer.pos(x1+width, y1+width, z1).color(r, g, b, a).endVertex();
buffer.pos(x2+width, y2+width, z2).color(r, g, b, a).endVertex();
buffer.pos(x1+width, y1-width, z1).color(r, g, b, a).endVertex();
buffer.pos(x2+width, y2-width, z2).color(r, g, b, a).endVertex();
buffer.pos(x1-width, y1-width, z1).color(r, g, b, a).endVertex();
buffer.pos(x2-width, y2-width, z2).color(r, g, b, a).endVertex();
}
@Override
protected ResourceLocation getEntityTexture(EntityArc entity){
return textures[entity.textureIndex];
return null;
}
}