org.craftmania.rendering.ChunkMeshRenderer.java Source code

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Here is the source code for org.craftmania.rendering.ChunkMeshRenderer.java

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/*******************************************************************************
 * Copyright 2012 Martijn Courteaux <martijn.courteaux@skynet.be>
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 ******************************************************************************/
package org.craftmania.rendering;

import org.craftmania.game.TextureStorage;
import org.craftmania.rendering.ChunkMeshBuilder.MeshType;
import org.craftmania.world.Chunk;
import org.lwjgl.opengl.ARBVertexBufferObject;
import org.lwjgl.opengl.GL11;

public class ChunkMeshRenderer {
    public static final int STRIDE = 8;
    public static final int POSITION_SIZE = 3;
    public static final int POSITION_OFFSET = 0;
    public static final int COLOR_SIZE = 3;
    public static final int COLOR_OFFSET = POSITION_OFFSET + POSITION_SIZE;
    public static final int TEX_COORD_SIZE = 2;
    public static final int TEX_COORD_OFFSET = COLOR_OFFSET + COLOR_SIZE;
    public static final int FLOAT_SIZE = 4;

    public static void renderChunkMesh(Chunk chunk, MeshType meshType) {
        if (chunk.getMesh().getVBO(meshType) <= 0) {
            return;
        }

        /* Bind the correct texture */
        GL11.glEnable(GL11.GL_TEXTURE_2D);
        TextureStorage.getTexture("terrain").bind();

        if (meshType == MeshType.OPAQUE) {
            GL11.glDisable(GL11.GL_BLEND);
        } else if (meshType == MeshType.TRANSLUCENT) {
            GL11.glDisable(GL11.GL_CULL_FACE);
            GL11.glEnable(GL11.GL_BLEND);
            GL11.glEnable(GL11.GL_ALPHA_TEST);
            GL11.glAlphaFunc(GL11.GL_GREATER, 0.0f);
        }

        ChunkMesh mesh = chunk.getMesh();

        /* Bind the buffer */
        ARBVertexBufferObject.glBindBufferARB(ARBVertexBufferObject.GL_ARRAY_BUFFER_ARB, mesh.getVBO(meshType));

        /* Enable the different kinds of data in the buffer */
        GL11.glEnableClientState(GL11.GL_VERTEX_ARRAY);
        GL11.glEnableClientState(GL11.GL_COLOR_ARRAY);
        GL11.glEnableClientState(GL11.GL_TEXTURE_COORD_ARRAY);

        // System.out.println("Chunk Vertices = " + mesh.getVertexCount());

        /* Define the starting positions */
        GL11.glVertexPointer(POSITION_SIZE, GL11.GL_FLOAT, STRIDE * FLOAT_SIZE, POSITION_OFFSET * FLOAT_SIZE);
        GL11.glTexCoordPointer(TEX_COORD_SIZE, GL11.GL_FLOAT, STRIDE * FLOAT_SIZE, TEX_COORD_OFFSET * FLOAT_SIZE);
        GL11.glColorPointer(COLOR_SIZE, GL11.GL_FLOAT, STRIDE * FLOAT_SIZE, COLOR_OFFSET * FLOAT_SIZE);

        /* Draw the buffer */
        GL11.glDrawArrays(GL11.GL_QUADS, 0, mesh.getVertexCount(meshType));

        /* Unbind the buffer */
        ARBVertexBufferObject.glBindBufferARB(ARBVertexBufferObject.GL_ARRAY_BUFFER_ARB, 0);

        /* Disable the different kindds of data */
        GL11.glDisableClientState(GL11.GL_VERTEX_ARRAY);
        GL11.glDisableClientState(GL11.GL_COLOR_ARRAY);
        GL11.glDisableClientState(GL11.GL_TEXTURE_COORD_ARRAY);

        if (meshType == MeshType.TRANSLUCENT) {
            GL11.glEnable(GL11.GL_CULL_FACE);
            GL11.glDisable(GL11.GL_ALPHA_TEST);
        }
    }

}