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[Help]: Vertex Array

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[Help]: Vertex Array
« on: October 20, 2010, 03:26:40 »
Hi!, i need help with vertex arrays. My problem is when i render more than 1 sprite, the image output looks weird.

Here is the VertexArray class
Code: [Select]
public class VertexArray {

    /**
     * Default VertexArray
     */
    public final static VertexArray DEFAULT = new VertexArray();

    /**
     * Allow to draw n Vertex per batch
     */
    protected final static int MAX_VERTEX = 500;
    protected final static int TRIANGLE_VERTEX = 4;

    /**
     * The diferents types of buffer
     */
    public final static int VERTEX  = 0;
    public final static int TEXTURE = 1;
    public final static int COLOR   = 2;

    /**
     * Each Buffer of the vertex array
     */
    protected FloatBuffer[] buffer = new FloatBuffer[3];
    /**
     * Amount of vertexs
     */
    protected int vertexAmount = 1;

    /**
     * Create a new instance of <code>VertexArray</code>
     *
     * @param bufferType
     */
    public VertexArray() {
        // Create the buffers
        buffer[VERTEX] = BufferUtils.createFloatBuffer( MAX_VERTEX * TRIANGLE_VERTEX * 3 );
        buffer[TEXTURE] = BufferUtils.createFloatBuffer( MAX_VERTEX * TRIANGLE_VERTEX * 2 );
        buffer[COLOR] = BufferUtils.createFloatBuffer( MAX_VERTEX * TRIANGLE_VERTEX * 4 );
        // Create the defaul values
        setTextureCoord(0, 0, 0.0f, 1.0f);
        setTextureCoord(0, 1, 0.0f, 0.0f);
        setTextureCoord(0, 2, 1.0f, 1.0f);
        setTextureCoord(0, 3, 1.0f, 0.0f);
        setColor(0,0, Color.White );
        setColor(0,1, Color.White );
        setColor(0,2, Color.White );
        setColor(0,3, Color.White );
        setVertex(0,0, new Vector3f(0.0f, 0.0f, 0.0f));
        setVertex(0,1, new Vector3f(0.0f, 32.0f, 0.0f));
        setVertex(0,2, new Vector3f(32.0f, 0.0f, 0.0f));
        setVertex(0,3, new Vector3f(32.0f, 32.0f, 0.0f));
        update();
    }

    /**
     * Set the amount of vertex to write
     *
     * @param amount
     */
    public void setQuantity( int amount ) {
        this.vertexAmount = amount;
    }

    /**
     * Set the complete vertex array
     *
     * @param vertex
     * @param position
     * @param width
     * @param height
     */
    public void setVertex( int vertex, Vector3f position, Vector3f size ) {
        setVertex(vertex, 0, new Vector3f(position.x, position.y, position.z));
        setVertex(vertex, 1, new Vector3f(position.x, position.y + size.y, position.z));
        setVertex(vertex, 2, new Vector3f(position.x + size.x, position.y, position.z));
        setVertex(vertex, 3, new Vector3f(position.x + size.x, position.y + size.y, position.z));
    }

    /**
     * Set a vertex position of the array
     *
     * @param vertex
     * @param index
     * @param data
     */
    public void setVertex( int vertex, int index, Vector3f data ) {
        buffer[VERTEX].put(vertex * TRIANGLE_VERTEX + (index * 3), data.x);
        buffer[VERTEX].put(vertex * TRIANGLE_VERTEX + (index * 3 + 1), data.y);
        buffer[VERTEX].put(vertex * TRIANGLE_VERTEX + (index * 3 + 2), data.z);
    }

    /**
     * set the color of the buffer
     *
     * @param vertex
     * @param color
     */
    public void setColor( int vertex, int index, Color data ) {
        buffer[COLOR].put(vertex * TRIANGLE_VERTEX + (index * 4), data.r);
        buffer[COLOR].put(vertex * TRIANGLE_VERTEX + (index * 4 + 1), data.g);
        buffer[COLOR].put(vertex * TRIANGLE_VERTEX + (index * 4 + 2), data.b);
        buffer[COLOR].put(vertex * TRIANGLE_VERTEX + (index * 4 + 3), data.a);
    }

    /**
     * Set the texture of the buffer
     *
     * @param index
     * @param tV
     * @param tU
     */
    public void setTextureCoord( int vertex, int index, float tV, float tU ) {
        buffer[TEXTURE].put(vertex * TRIANGLE_VERTEX + (index * 2), tV);
        buffer[TEXTURE].put(vertex * TRIANGLE_VERTEX + (index * 2 + 1), tU);
    }

    /**
     * Unlock the buffer for writing
     *
     * @param bufferID
     */
    public void clear(int bufferID) {
        buffer[bufferID].clear();
    }

    /**
     * Update a buffer
     *
     * @param bufferID
     */
    public void update(int bufferID) {
        buffer[bufferID].flip();
    }

    /**
     * Update all the buffers
     */
    public void update() {
        for (int i = 0; i < buffer.length; i++) {
            buffer[i].flip();
        }
    }

    /**
     * Clear all the buffers
     */
    public void clear() {
        for (int i = 0; i < buffer.length; i++) {
            buffer[i].clear();
        }
    }

    /**
     * Merge this array with another
     *
     * @param array
     */
    public void merge( VertexArray array ) {

    }

}


Font String Generator
Code: [Select]
public class RendererFontNode extends RendererNode {

    /**
     * String of the node
     */
    private String textBlock;
    /**
     * Font class
     */
    private Font fontClass;

    /**
     * Constructor
     *
     * @param text
     * @param font
     */
    protected RendererFontNode(String text, Vector2f position, Font font, Texture texture, Color[] color) {
        this.textBlock = text;
        this.fontClass = font;
        this.color = color;
        this.texture = texture;
        this.position = new Vector3f(position.x, position.y, 90.0f);
        updateGeometry();
    }

    /**
     * Update the text
     *
     * @param text
     */
    public void setText( String text ) {
        this.textBlock = text;
        updateGeometry();
    }

    /**
     * Set the character color
     *
     * @param index
     * @param color
     */
    protected void setCharacterColor(int index, Color[] color) {
        this.vertexArray.setColor(index, 0, color[0]);
        this.vertexArray.setColor(index, 1, color[1]);
        this.vertexArray.setColor(index, 2, color[2]);
        this.vertexArray.setColor(index, 3, color[3]);
    }

    /**
     * Set the source of a character
     *
     * @param index
     * @param x
     * @param y
     * @param width
     * @param height
     */
    protected void setSource(int index, float x, float y, float width, float height) {
        float MinX, MaxX, MinY, MaxY;
        // Calculate
        MinX = x / (float) texture.getImage().getWidth();
        MinY = y / (float) texture.getImage().getHeight();
        MaxX = (x + width) / (float) texture.getImage().getWidth();
        MaxY = (y + height) / (float) texture.getImage().getHeight();
        // Update. the buffers
        vertexArray.setTextureCoord(index, 0, MinX, MinY);
        vertexArray.setTextureCoord(index, 1, MinX, MaxY);
        vertexArray.setTextureCoord(index, 2, MaxX, MinY);
        vertexArray.setTextureCoord(index, 3, MaxX, MaxY);
    }

    /**
     * Update the node geometry
     */
    protected void updateGeometry() {
        Vector3f currentPosition = position;
        Vector3f currentSize = new Vector3f(0.0f, 0.0f, 1.0f);
        // Clear all the buffers
        this.vertexArray.clear();
        // Set the amount of vertex
        this.vertexArray.setQuantity(textBlock.length());
        // For each character
        for (int i = 0; i < textBlock.length(); i++) {
            // Update the color
            setCharacterColor(i, color);
            // Get the CharacterKey
            FontKey key = fontClass.getKey(textBlock.charAt(i));
            // Update the Position
            currentSize.x = key.width;
            currentSize.y = key.height;
            this.vertexArray.setVertex(i, currentPosition, currentSize);
            currentPosition.x += key.width;
            // Update the Texture Coordination
            setSource(i, key.x, key.y, key.width, key.height);
        }
        // Update all the buffers
        this.vertexArray.update();
    }
}

The Vertex Renderer
Code: [Select]
        // Render the vertexArray
        GL11.glVertexPointer(3, 0, vertexArray.buffer[VertexArray.VERTEX]);
        if (nodeTexture != null) {
            if (rendererState.vertexUsage[1] == false) {
                GL11.glEnableClientState(GL11.GL_TEXTURE_COORD_ARRAY);
                rendererState.vertexUsage[1] = true;
            }
            GL11.glTexCoordPointer(2, 0, vertexArray.buffer[VertexArray.TEXTURE]);
        } else {
            if (rendererState.vertexUsage[1] == true) {
                GL11.glDisableClientState(GL11.GL_TEXTURE_COORD_ARRAY);
                rendererState.vertexUsage[1] = false;
            }
        }
        GL11.glColorPointer(4, 0, vertexArray.buffer[VertexArray.COLOR]);
        GL11.glDrawArrays(GL11.GL_TRIANGLE_STRIP, 0, VertexArray.TRIANGLE_VERTEX * vertexArray.vertexAmount);

Help plz xD

Re: [Help]: Vertex Array
« Reply #1 on: October 20, 2010, 14:00:07 »
...My problem is when i render more than 1 sprite, the image output looks weird...

What looks weird about it exactly?

If 1 sprite works but 2 doesn't, perhaps when you draw the 1st sprite you're changing things on the current matrix and not popping the changes off when you go to draw the 2nd sprite.  Try this in your code:

//draw all sprites
for( . . . ) {
  glPushMatrix();
  drawSprite();
  glPopMatrix();
}
cool story, bro

Re: [Help]: Vertex Array
« Reply #2 on: October 20, 2010, 18:24:13 »
it happend when i render more than one triangle strip in a vertex array.

Re: [Help]: Vertex Array
« Reply #3 on: October 21, 2010, 02:04:12 »
well i fixed it :D

Correct code is:
Code: [Select]
    private void setVertex(int vertex, int index, int x, int y, int z) {
        buffer[VERTEX].put(vertex * TRIANGLE_VERTEX * 3 + (index * 3), x);
        buffer[VERTEX].put(vertex * TRIANGLE_VERTEX * 3 + (index * 3 + 1), y);
        buffer[VERTEX].put(vertex * TRIANGLE_VERTEX * 3 + (index * 3 + 2), z);
    }