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Author: BloodShura (posted 2014-05-01 18:37:11, viewed 92 times)

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package org.shura.rpg.graphics.defaults;

import org.shura.rpg.graphics.DrawMode;
import org.shura.rpg.graphics.Tessellator;

/**
 * @author Markus_Persson
 */
public class DefaultTessellator extends Tessellator {
  public static final Integer VBO_COUNT = 8;
  private DrawMode drawMode;
  private Boolean isDrawing;
  private Integer vboIndex;
  private VertexObject vertexObject;

  public DefaultTessellator() {
    this(256 * 256); // 65536
  }

  public DefaultTessellator(Integer bufferSize) {
    this.vertexObject = new VertexObject(bufferSize);
    this.isDrawing = false;
    this.vboIndex = 0;
  }

  public void addVector(double x, double y, double z) {
    vertexObject.addVertex(x - getTranslation().getX(), y + getTranslation().getY(), z + getTranslation().getZ(), getNormal(),
      getColorInt(), hasTexture() ? getTextureUV().getX() : null, hasTexture() ? getTextureUV().getY() : null);
  }

  public void draw() {
    if (!isDrawing()) {
      throw new IllegalStateException("Failed to draw tessellation: Not drawing!");
    }

    if (vertexObject.countVertexes() > 0) {
      vertexObject.intBuffer().clear();
      vertexObject.intBuffer().put(vertexObject.rawBuffer(), 0, vertexObject.rawBufferIndex());
      vertexObject.byteBuffer().position(0);
      vertexObject.byteBuffer().limit(vertexObject.rawBufferIndex() * 4);

      if (usesVBO()) {
        if (vertexObject.vertexBuffer() == null) {
          vertexObject.setupVertexBuffer();
        }

        this.vboIndex = (vboIndex + 1) % VBO_COUNT;

        context.arbBindBuffer(context.ARB_ARRAY_BUFFER, vertexObject.vertexBuffer().get(vboIndex));
        context.arbBufferData(context.ARB_ARRAY_BUFFER, context.ARB_STREAM_DRAW, vertexObject.byteBuffer());
      }

      if (hasTexture()) {
        if (usesVBO()) {
          context.glTexCoordPointer(2, context.GL_FLOAT, 32, 12L);
        }
        else {
          vertexObject.floatBuffer().position(3);
          context.glTexCoordPointer(2, 32, vertexObject.floatBuffer());
        }

        context.glEnableClientState(context.GL_TEXTURE_COORD_ARRAY);
      }

      if (hasColor()) {
        if (usesVBO()) {
          context.glColorPointer(4, context.GL_UNSIGNED_BYTE, 32, 20L);
        }
        else {
          vertexObject.byteBuffer().position(20);
          context.glColorPointer(4, true, 32, vertexObject.byteBuffer());
        }

        context.glEnableClientState(context.GL_COLOR_ARRAY);
      }

      if (hasNormals()) {
        if (usesVBO()) {
          context.glNormalPointer(context.GL_UNSIGNED_BYTE, 32, 24L);
        }
        else {
          vertexObject.byteBuffer().position(24);
          context.glNormalPointer(32, vertexObject.byteBuffer());
        }

        context.glEnableClientState(context.GL_NORMAL_ARRAY);
      }

      if (usesVBO()) {
        context.glVertexPointer(3, context.GL_FLOAT, 32, 0L);
      }
      else {
        vertexObject.floatBuffer().position(0);
        context.glVertexPointer(3, 32, vertexObject.floatBuffer());
      }

      context.glEnableClientState(context.GL_VERTEX_ARRAY);
      context.glDrawArrays(getMode().getID(), 0, vertexObject.countVertexes());
      context.glDisableClientState(context.GL_VERTEX_ARRAY);

      if (hasTexture()) {
        context.glDisableClientState(context.GL_TEXTURE_COORD_ARRAY);
      }

      if (hasColor()) {
        context.glDisableClientState(context.GL_COLOR_ARRAY);
      }

      if (hasNormals()) {
        context.glDisableClientState(context.GL_NORMAL_ARRAY);
      }
    }

    this.isDrawing = false;
  }

  public DrawMode getMode() {
    return drawMode;
  }

  public VertexObject getVO() {
    return vertexObject;
  }

  public Boolean isDrawing() {
    return isDrawing;
  }

  public void resetParammeters() {
    super.resetParammeters();

    getVO().clear();
  }

  public void start(DrawMode mode) {
    if (isDrawing()) {
      throw new IllegalStateException("Failed to start tessellating: Already drawing!");
    }

    this.drawMode = mode;
    this.isDrawing = true;

    resetParammeters();
  }

  public Boolean usesVBO() {
    return sc.getDisplay().getCompatibility().isVBOSupported();
  }
}





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