Water Shader

[AGP]

I've decided to try my hand at a water shader again. Problem is a million visibility lists are being created and I'm running out of memory. Egon, I've e-mailed you the source and maps. Any help from anyone is appreciated.

The frame:

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import java.awt.*;
import java.awt.event.*;

import com.threed.jpct.*;

public class WaterShaderTest extends Frame implements WindowListener {
     public World theWorld;
     private FrameBuffer buffer;
     public Object3D waterPlane;
     private Camera theCamera;
     private boolean gameLoop;
     private Canvas glCanvas;
     private NormalMapShader shader;

     public WaterShaderTest() {
this.setTitle("BR's");
theWorld = new World();
buffer = new FrameBuffer(1024, 768, FrameBuffer.SAMPLINGMODE_GL_AA_2X);
glCanvas = buffer.enableGLCanvasRenderer();
waterPlane = Loader.loadOBJ("WaterPlane.obj", null, 1f)[0];
waterPlane.build();
theWorld.addObject(waterPlane);
theCamera = theWorld.getCamera();
theCamera.setPosition(0, -20, 0);
theCamera.lookAt(waterPlane.getTransformedCenter());
try {
     shader = new NormalMapShader(theWorld, buffer, waterPlane);
}
catch (Exception e) {System.err.println("Problem loading shader: "+e.getMessage());System.exit(1);}
this.add(glCanvas);
this.addWindowListener(this);
this.setSize(1024, 768);
this.setVisible(true);
shaderLoop();
     }

     private void draw() {
buffer.clear(Color.RED);
theWorld.renderScene(buffer);
theWorld.draw(buffer);
buffer.displayGLOnly();
glCanvas.repaint();
     }

     private void shaderLoop() {
gameLoop = true;
while (gameLoop) {
     draw();
     Thread.yield();
}
this.dispose();
System.exit(0);
     }

     public void windowClosing(WindowEvent e) {
if (e.getWindow() == this)
     gameLoop = false;
     }
     public void windowClosed(WindowEvent e) {}
     public void windowOpened(WindowEvent e) {}
     public void windowActivated(WindowEvent e) {}
     public void windowDeactivated(WindowEvent e) {}
     public void windowIconified(WindowEvent e) {}
     public void windowDeiconified(WindowEvent e) {}

     public static void main(String[] args) {
new WaterShaderTest();
     }
}


The shader code:

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import com.threed.jpct.*;
import java.nio.*;
import org.lwjgl.*;
import org.lwjgl.opengl.*;

public class NormalMapShader {//TAKEN FROM jpct's Wiki. I ADAPTED IT TO MAKE IT NOT BE A STANDALONE APP
     private World world;
     private FrameBuffer buffer;
     private Object3D object;
     private long time = System.nanoTime()/1000000L;
     private int fps = 0;

     public NormalMapShader(World world, FrameBuffer buffer, Object3D object) throws Exception {
Config.glTrilinear = true;
Config.specTerm = 10;
Config.specPow = 4;
this.world = world;
this.buffer = buffer;
this.object = object;

TextureManager.getInstance().addTexture("Maps\\OceanNightSmall.png", new Texture("Maps\\OceanNightSmall.png"));
TextureManager.getInstance().addTexture("Maps\\WaterNormalsSmall.png", new Texture("Maps\\WaterNormalsSmall.png"));

TextureInfo ti = new TextureInfo(TextureManager.getInstance().getTextureID("Maps\\OceanNightSmall.png"));
ti.add(TextureManager.getInstance().getTextureID("Maps\\WaterNormalsSmall.png"), TextureInfo.MODE_MODULATE);//MODULATE/BLEND (ORIGINALLY MOD)
object.setTexture(ti);

// object.setLighting(Object3D.LIGHTING_NO_LIGHTS);
// object.setCulling(false);
// object.setAdditionalColor(new java.awt.Color(128, 255, 230));

object.compile();
object.setSpecularLighting(true);
object.strip();
object.setRenderHook(new NormalMapping());
     }
}
class NormalMapping implements IRenderHook {//THE SHADER "FRAMEWORK"
     private String fragSource = Loader.loadTextFile("NewestWaterFragmentShader.glsl");//SHADER #1 WaterFrag
     private String vertexSource = Loader.loadTextFile("NewestWaterVertexShader.glsl");//SHADER #2 WaterVert
     private int prg = 0;
     private int fragShade = 0;
     private int vertShade = 0;
     private boolean init = false;
     private int locColor = 0;
     private int locNormal = 0;
     private int locRadius = 0;

     public void beforeRendering(int polyID) {
if (!init) {
     init();
}
ARBShaderObjects.glUseProgramObjectARB(prg);
ARBShaderObjects.glUniform1iARB(locColor, 0);
ARBShaderObjects.glUniform1iARB(locNormal, 1);
ARBShaderObjects.glUniform1fARB(locRadius, 0.0005f);
     }

     public void afterRendering(int polyID) {
ARBShaderObjects.glUseProgramObjectARB(0);
     }
     public void clear() {}//called if this IRenderHook implemention has been used to render current object-(part) but won't be used for the next one. Can be used to optimize some things. The idea is optimize setup/teardown work that would otherwise have to take place in every call to before- and afterRendering()
     public void onDispose() {
ARBShaderObjects.glDeleteObjectARB(fragShade);
ARBShaderObjects.glDeleteObjectARB(vertShade);
ARBShaderObjects.glDeleteObjectARB(prg);
     }

     public boolean repeatRendering() {
return false;
     }

     private void init() {
prg = ARBShaderObjects.glCreateProgramObjectARB();
fragShade = ARBShaderObjects.glCreateShaderObjectARB(ARBFragmentShader.GL_FRAGMENT_SHADER_ARB);

byte[] src = fragSource.getBytes();
ByteBuffer shader = BufferUtils.createByteBuffer(src.length);
shader.put(src);
shader.flip();

ARBShaderObjects.glShaderSourceARB(fragShade, shader);
ARBShaderObjects.glCompileShaderARB(fragShade);
ARBShaderObjects.glAttachObjectARB(prg, fragShade);

vertShade = ARBShaderObjects.glCreateShaderObjectARB(ARBVertexShader.GL_VERTEX_SHADER_ARB);

src = vertexSource.getBytes();
ByteBuffer shader2 = BufferUtils.createByteBuffer(src.length);
shader2.put(src);
shader2.flip();

ARBShaderObjects.glShaderSourceARB(vertShade, shader2);
ARBShaderObjects.glCompileShaderARB(vertShade);
ARBShaderObjects.glAttachObjectARB(prg, vertShade);

ARBShaderObjects.glLinkProgramARB(prg);

Logger.log("Shader compiled!", Logger.MESSAGE);

locColor = getLocation("colorMap");
locNormal = getLocation("normalMap");
locRadius = getLocation("invRadius");

init = true;
     }

     private int getLocation(String n) {
byte[] nb=n.getBytes();
ByteBuffer name = BufferUtils.createByteBuffer(nb.length+1);
name.put(nb);
name.put((byte)0);
name.flip();
return ARBShaderObjects.glGetUniformLocationARB(prg, name);
     }
}


[EgonOlsen]

I bet that you have some exception that you swallow somewhere (most likely in your drawing method/game loop) or otherwise, you wouldn't create a million visiblitity lists.

[EgonOlsen]

BTW: Why are you using an explicit implementation of the shader using gl commands and not the GLSLShader-class? Is anything wrong with it? Because it covers a lot of stuff that the example implementation in the wiki doesn't.

[AGP]

I started this last year. I honestly don't remember why I used that one, I'm just trying to continue what I started. Yesterday I made a little test case with the GLSLShader class which renders. I'm not sure how to make the water "move," though.

[MrM]

Sorry for not being helpful, but this just popped to mind so I though I might as well share it:

WaterTextureEffect()

You can check it out in the DOC...

[EgonOlsen]

I started this last year. I honestly don't remember why I used that one, I'm just trying to continue what I started. Yesterday I made a little test case with the GLSLShader class which renders. I'm not sure how to make the water "move," though.

Just for moving, you can use a texture matrix (can be set on the Object3D IIRC).

[AGP]

Do I move it on the normal map in the shader?

[EgonOlsen]

It will be applied to the first texture stage IIRC. If you are in a shader anyway, you are free to alter the texture coordinates in any way you like. Maybe that's the better solution.

[AGP]

How do I have the GLSLShader class move the map's coordinates?

[EgonOlsen]

No, you can do that in the shader code itself.

[AGP]

But since you're saying that the GLSLShader class is more advanced, couldn't you add such a method to it?

[EgonOlsen]

No, that doesn't make any sense. The GLSLShader class has no clue about what you are doing in your shader. Once you are in shader world, you are on your own.

[AGP]

Oh, you mean to modify the shader itself, as opposed to "framework," which is what I thought you meant. I guess I can do that. Any idea where it should go in the following shader code?

Code Select Expand


varying vec4 waterTex0;
varying vec4 waterTex1;
varying vec4 waterTex2;
varying vec4 waterTex3;
varying vec4 waterTex4;
uniform vec4 viewpos, lightpos;
uniform float time, time2;
//unit 0 = water_reflection
//unit 1 = water_refraction
//unit 2 = water_normalmap
//unit 3 = water_dudvmap
//unit 4 = water_depthmap

void main(void) {
    vec4 mpos, temp;
    vec4 tangent = vec4(1.0, 0.0, 0.0, 0.0);
    vec4 norm = vec4(0.0, 1.0, 0.0, 0.0);
    vec4 binormal = vec4(0.0, 0.0, 1.0, 0.0);

    mat4 mvp = gl_ModelViewProjectionMatrix;
    mat4 mtx = gl_TextureMatrix[0];

    temp = viewpos - gl_Vertex;
    waterTex4.x = dot(temp, tangent);
    waterTex4.y = dot(temp, binormal);
    waterTex4.z = dot(temp, norm);
    waterTex4.w = 0.0;

    temp = lightpos - gl_Vertex;
    waterTex0.x = dot(temp, tangent);
    waterTex0.y = dot(temp, binormal);
    waterTex0.z = dot(temp, norm);
    waterTex0.w = 0.0;

    mpos = mvp * gl_Vertex;

    vec4 t1 = vec4(0.0, -time, 0.0,0.0);
    vec4 t2 = vec4(0.0, -time2, 0.0,0.0);

    waterTex1 = gl_MultiTexCoord0 + t1;
    waterTex2 = gl_MultiTexCoord0 + t2;

    waterTex3 = mpos;

    gl_Position = ftransform();
}


[EgonOlsen]

You already have the different texture coordinates in the varyings waterTex0...4. You can simply modify them if needed.

[AGP]

Thanks. I'll try it out and if all goes well put up this example on the wiki.