package com.jogamp.opengl.test.junit.jogl.glu;

import java.nio.ByteBuffer;

import javax.media.opengl.GL2;
import javax.media.opengl.GLCapabilities;
import javax.media.opengl.GLContext;
import javax.media.opengl.GLDrawableFactory;
import javax.media.opengl.GLOffscreenAutoDrawable;
import javax.media.opengl.GLProfile;

import org.junit.AfterClass;
import org.junit.Assert;
import org.junit.BeforeClass;
import org.junit.Test;

import jogamp.opengl.glu.mipmap.Mipmap;
import jogamp.opengl.glu.mipmap.ScaleInternal;

import com.jogamp.common.nio.Buffers;
import com.jogamp.opengl.util.texture.Texture;
import com.jogamp.opengl.util.texture.TextureData;
import com.jogamp.opengl.util.texture.TextureIO;

/**
 * This test creates a {@link Texture} from {@link TextureData} of various pixel formats
 * and pixel types with auto generate mipmaps set to {@code true}.
 * <br></br>
 * Bug Reference: https://jogamp.org/bugzilla/show_bug.cgi?id=365
 * <br></br>
 * The bug pertains to mipmap generation from a Texture and exists in {@link ScaleInternal} 
 * where a {@link java.nio.BufferUnderflowException} is thrown.
 * <br></br>
 * <ul>This suite of test cases test:
 * <li>{@link ScaleInternal#scale_internal_ubyte(int, int, int, ByteBuffer, int, int, ByteBuffer, int, int, int)}</li>
 * <li>{@link ScaleInternal#scale_internal_byte(int, int, int, ByteBuffer, int, int, ByteBuffer, int, int, int)}</li>
 * <li>{@link ScaleInternal#scale_internal_ushort(int, int, int, ByteBuffer, int, int, java.nio.ShortBuffer, int, int, int, boolean)}</li>
 * <li>{@link ScaleInternal#scale_internal_short(int, int, int, ByteBuffer, int, int, java.nio.ShortBuffer, int, int, int, boolean)}</li>
 * <li>{@link ScaleInternal#scale_internal_uint(int, int, int, ByteBuffer, int, int, java.nio.IntBuffer, int, int, int, boolean)}</li>
 * <li>{@link ScaleInternal#scale_internal_int(int, int, int, ByteBuffer, int, int, java.nio.IntBuffer, int, int, int, boolean)}</li>
 * <li>{@link ScaleInternal#scale_internal_float(int, int, int, ByteBuffer, int, int, java.nio.FloatBuffer, int, int, int, boolean)}</li>
 * </ul>
 * 
 * @author Michael Esemplare
 *
 */
public class TestBug365TextureGenerateMipMaps {
	static GLOffscreenAutoDrawable drawable;
	
	@BeforeClass
    public static void setup() throws Throwable {
		// disableNPOT
		System.setProperty("jogl.texture.nonpot", "true");
        try {
        	setUpOffscreenAutoDrawable();
        } catch (Throwable t) {
            throw t;
        }
    }
	
    @AfterClass
    public static void teardown() {
        tearDownOffscreenAutoDrawable();
    }
    
    private static void setUpOffscreenAutoDrawable() throws Throwable {
    	GLProfile glp = GLProfile.getDefault();
		GLCapabilities caps = new GLCapabilities(glp);
		
		GLDrawableFactory factory = GLDrawableFactory.getFactory(glp);
		
		// Make a drawable to get an offscreen context
	    drawable = factory.createOffscreenAutoDrawable(null, caps, null, 2, 2, null);
	    
	    drawable.setRealized(true);

	    GLContext glContext = drawable.getContext();
	    try {
	    	Assert.assertTrue("Could not make context current", GLContext.CONTEXT_NOT_CURRENT < glContext.makeCurrent());
	    } catch (Throwable t) {
	    	tearDownOffscreenAutoDrawable();
            throw t;
        }
    }
    
    private static void tearDownOffscreenAutoDrawable() {
        if(drawable != null) {
        	drawable.getContext().release();
        	drawable.destroy();
	    	drawable = null;
        }
    }
    
    private static void testTextureMipMapGeneration(int width, int height, int pixelFormat, int pixelType) {
		int internalFormat = pixelFormat;
		int border = 0;
		boolean mipmap = true;
		boolean dataIsCompressed = false;
		boolean mustFlipVertically = false;
		
		int memReq = Mipmap.image_size( width, height, pixelFormat, pixelType );
		ByteBuffer buffer = Buffers.newDirectByteBuffer( memReq );
		
		TextureData data = new TextureData(drawable.getGLProfile(), 
				internalFormat, 
				width, 
				height, 
				border, 
				pixelFormat, 
				pixelType, 
				mipmap, 
				dataIsCompressed, 
				mustFlipVertically, 
				buffer, 
				null);
		
		Texture texture = TextureIO.newTexture(drawable.getGL(), data);
		// Cleanup
		texture.destroy(drawable.getGL());
		data.destroy();
		buffer.clear();
		buffer = null;
    }
    
    @Test
    public void test00_MipMap_ScaleInternal_RGB_UBYTE () {
    	int width = 1;
    	int height = 7;
    	int pixelFormat = GL2.GL_RGB;
    	int pixelType = GL2.GL_UNSIGNED_BYTE;
    	
    	testTextureMipMapGeneration(width, height, pixelFormat, pixelType);
    }
    
    @Test
    public void test01_MipMap_ScaleInternal_RGBA_UBYTE () {
    	int width = 1;
    	int height = 7;
    	int pixelFormat = GL2.GL_RGBA;
    	int pixelType = GL2.GL_UNSIGNED_BYTE;
    	
    	testTextureMipMapGeneration(width, height, pixelFormat, pixelType);
    }
    
    @Test
    public void test02_MipMap_ScaleInternal_RGB_BYTE () {
    	int width = 1;
    	int height = 7;
    	int pixelFormat = GL2.GL_RGB;
    	int pixelType = GL2.GL_BYTE;
    	
    	testTextureMipMapGeneration(width, height, pixelFormat, pixelType);
    }
    
    @Test
    public void test03_MipMap_ScaleInternal_RGBA_BYTE () {
    	int width = 1;
    	int height = 7;
    	int pixelFormat = GL2.GL_RGBA;
    	int pixelType = GL2.GL_BYTE;
    	
    	testTextureMipMapGeneration(width, height, pixelFormat, pixelType);
    }
    
    @Test
    public void test04_MipMap_ScaleInternal_RGB_USHORT () {
    	int width = 1;
    	int height = 7;
    	int pixelFormat = GL2.GL_RGB;
    	int pixelType = GL2.GL_UNSIGNED_SHORT;
    	
    	testTextureMipMapGeneration(width, height, pixelFormat, pixelType);
    }
    
    @Test
    public void test05_MipMap_ScaleInternal_RGBA_USHORT () {
    	int width = 1;
    	int height = 7;
    	int pixelFormat = GL2.GL_RGBA;
    	int pixelType = GL2.GL_UNSIGNED_SHORT;
    	
    	testTextureMipMapGeneration(width, height, pixelFormat, pixelType);
    }
    
    @Test
    public void test06_MipMap_ScaleInternal_RGB_SHORT () {
    	int width = 1;
    	int height = 7;
    	int pixelFormat = GL2.GL_RGB;
    	int pixelType = GL2.GL_SHORT;
    	
    	testTextureMipMapGeneration(width, height, pixelFormat, pixelType);
    }
    
    @Test
    public void test07_MipMap_ScaleInternal_RGBA_SHORT () {
    	int width = 1;
    	int height = 7;
    	int pixelFormat = GL2.GL_RGBA;
    	int pixelType = GL2.GL_SHORT;
    	
    	testTextureMipMapGeneration(width, height, pixelFormat, pixelType);
    }
    
    @Test
    public void test08_MipMap_ScaleInternal_RGB_UINT () {
    	int width = 1;
    	int height = 7;
    	int pixelFormat = GL2.GL_RGB;
    	int pixelType = GL2.GL_UNSIGNED_INT;
    	
    	testTextureMipMapGeneration(width, height, pixelFormat, pixelType);
    }
    
    @Test
    public void test09_MipMap_ScaleInternal_RGBA_UINT () {
    	int width = 1;
    	int height = 7;
    	int pixelFormat = GL2.GL_RGBA;
    	int pixelType = GL2.GL_UNSIGNED_INT;
    	
    	testTextureMipMapGeneration(width, height, pixelFormat, pixelType);
    }
    
    @Test
    public void test10_MipMap_ScaleInternal_RGB_INT () {
    	int width = 1;
    	int height = 7;
    	int pixelFormat = GL2.GL_RGB;
    	int pixelType = GL2.GL_INT;
    	
    	testTextureMipMapGeneration(width, height, pixelFormat, pixelType);
    }
    
    @Test
    public void test11_MipMap_ScaleInternal_RGBA_INT () {
    	int width = 1;
    	int height = 7;
    	int pixelFormat = GL2.GL_RGBA;
    	int pixelType = GL2.GL_INT;
    	
    	testTextureMipMapGeneration(width, height, pixelFormat, pixelType);
    }
    
    @Test
    public void test12_MipMap_ScaleInternal_RGB_FLOAT () {
    	int width = 1;
    	int height = 7;
    	int pixelFormat = GL2.GL_RGB;
    	int pixelType = GL2.GL_FLOAT;
    	
    	testTextureMipMapGeneration(width, height, pixelFormat, pixelType);
    }
    
    @Test
    public void test13_MipMap_ScaleInternal_RGBA_FLOAT () {
    	int width = 1;
    	int height = 7;
    	int pixelFormat = GL2.GL_RGBA;
    	int pixelType = GL2.GL_FLOAT;
    	
    	testTextureMipMapGeneration(width, height, pixelFormat, pixelType);
    }

	public static void main(String[] args) {
		org.junit.runner.JUnitCore.main(TestBug365TextureGenerateMipMaps.class.getName());
	}
}