org.meanworks.engine.RenderState.java Source code

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Here is the source code for org.meanworks.engine.RenderState.java

Source

package org.meanworks.engine;

import org.lwjgl.opengl.GL11;
import org.lwjgl.util.vector.Matrix4f;
import org.meanworks.engine.render.opengl.shader.ShaderProgram;
import org.meanworks.engine.render.texture.Texture;

/**
 * Copyright (C) 2013 Steffen Evensen
 * 
 * This program is free software: you can redistribute it and/or modify it under
 * the terms of the GNU General Public License as published by the Free Software
 * Foundation, either version 3 of the License, or (at your option) any later
 * version.
 * 
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
 * details.
 * 
 * You should have received a copy of the GNU General Public License along with
 * this program. If not, see <http://www.gnu.org/licenses/>.
 * 
 * @author Meanz
 */
public class RenderState {

    /*
     * The currently bound textures
     */
    private static Texture[] boundTextures = new Texture[EngineConfig.MAX_TEXTURE_UNITS];

    /*
     * The currently bound shader program
     */
    private static ShaderProgram boundShaderProgram;

    /*
     * Holds information about how many vertices is being rendered
     */
    private static int renderedVertices = 0;

    /*
     * Holds information about how many objects is being rendered
     */
    private static int renderedObjects = 0;

    /*
     * The matrices that we are going to use for the next rendering call
     */
    private static Matrix4f projectionViewMatrix;
    private static Matrix4f transformMatrix;

    /**
     * Get the projection matrix that will be used the next draw call
     * 
     * @return
     */
    public static Matrix4f getProjectionViewMatrix() {
        return projectionViewMatrix;
    }

    /**
     * Get the transformation matrix that will be used the next draw call
     * 
     * @return
     */
    public static Matrix4f getTransformMatrix() {
        return transformMatrix;
    }

    /**
     * Set the projection matrix that will be used the next draw call
     * 
     * @param projectionViewMatrix
     */
    public static void setProjectionViewMatrix(Matrix4f projectionViewMatrix) {
        RenderState.projectionViewMatrix = projectionViewMatrix;
    }

    /**
     * Set the transform matrix that will be used the next draw call
     * 
     * @param transformMatrix
     */
    public static void setTransformMatrix(Matrix4f transformMatrix) {
        RenderState.transformMatrix = transformMatrix;
    }

    /**
     * Increment the number of rendered objects
     */
    public static void addRenderedObject() {
        renderedObjects += 1;
    }

    /**
     * Get the number of rendered objects
     * 
     * @return
     */
    public static int getRenderedObjects() {
        return renderedObjects;
    }

    /**
     * Get the number of rendered vertices
     * 
     * @return
     */
    public static int getRenderedVertices() {
        return renderedVertices;
    }

    /**
     * Clears the number of rendered vertices
     */
    public static void clearRenderedVertices() {
        renderedVertices = 0;
        renderedObjects = 0;
    }

    /**
     * Add the given number of vertices to the total amount of rendered vertices
     * this frame
     * 
     * @param amt
     */
    public static void addRenderedVertices(int amt) {
        renderedVertices += amt;
    }

    /**
     * Sets the given texture unit as active
     * 
     * @param texture
     */
    public static void activeTexture(int textureUnit) {
        // Ignore for now
    }

    /**
     * Bind the given texture to the given texture unit
     * 
     * @param textureUnit
     * @param texture
     */
    public static void bindTexture(int textureUnit, Texture texture) {
        boundTextures[textureUnit] = texture;
    }

    /**
     * Get's the currently bound shader program
     * 
     * @return
     */
    public static ShaderProgram getBoundShader() {
        return boundShaderProgram;
    }

    /**
     * Bind a shader program
     * 
     * @param program
     */
    public static void setBoundShader(ShaderProgram program) {
        boundShaderProgram = program;
    }

    /**
     * Clear the drawing state
     */
    public static void clearState() {
        if (getBoundShader() != null) {
            ShaderProgram.bindNone();
            setBoundShader(null);
        }
        // Clear all texture units
        for (int i = 0; i < boundTextures.length; i++) {
            boundTextures[i] = null;
        }
        // Update parameters
        GL11.glColor3f(1.0f, 1.0f, 1.0f);

    }
}