com.samrj.devil.gl.RBO.java Source code

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Here is the source code for com.samrj.devil.gl.RBO.java

Source

package com.samrj.devil.gl;

import com.samrj.devil.graphics.TexUtil;
import org.lwjgl.opengl.GL11;
import org.lwjgl.opengl.GL30;

/**
 * OpenGL render buffer wrapper.
 * 
 * @author Samuel Johnson (SmashMaster)
 * @copyright 2015 Samuel Johnson
 * @license https://github.com/SmashMaster/DevilUtil/blob/master/LICENSE
 */
public final class RBO extends DGLObj {
    public final int id;
    private boolean deleted;
    private long vramUsage;

    RBO() {
        DGL.checkState();
        if (!DGL.getCapabilities().OpenGL30)
            throw new UnsupportedOperationException("Render buffers unsupported in OpenGL < 3.0");
        id = GL30.glGenRenderbuffers();
    }

    /**
     * @return Whether this render buffer is bound.
     */
    public final boolean isBound() {
        return !deleted && GL11.glGetInteger(GL30.GL_RENDERBUFFER_BINDING) == id;
    }

    final int tempBind() {
        int oldID = GL11.glGetInteger(GL30.GL_RENDERBUFFER_BINDING);
        if (oldID != id)
            GL30.glBindRenderbuffer(GL30.GL_RENDERBUFFER, id);
        return oldID;
    }

    final void tempUnbind(int oldID) {
        if (oldID == id)
            return;
        GL30.glBindRenderbuffer(GL30.GL_RENDERBUFFER, oldID);
    }

    /**
     * Binds this render buffer.
     */
    public final void bind() {
        if (deleted)
            throw new IllegalStateException("Cannot bind deleted render buffer.");
        GL30.glBindRenderbuffer(GL30.GL_RENDERBUFFER, id);
    }

    /**
     * Allocates space on the GPU for an image of the given size and format.
     * 
     * @param width The width of the image.
     * @param height The height of the image.
     * @param format The format of the image.
     */
    public final void storage(int width, int height, int format) {
        if (width <= 0 || height <= 0)
            throw new IllegalArgumentException("Illegal image dimensions.");

        int oldID = tempBind();
        GL30.glRenderbufferStorage(GL30.GL_RENDERBUFFER, format, width, height);
        tempUnbind(oldID);

        long newVRAM = TexUtil.getBits(format) * width * height;
        Profiler.addUsedVRAM(newVRAM - vramUsage);
        vramUsage = newVRAM;
    }

    @Override
    void delete() {
        Profiler.removeUsedVRAM(vramUsage);
        vramUsage = 0;
        GL30.glDeleteRenderbuffers(id);
        deleted = true;
    }
}