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package javax.media.opengl;

import java.nio.*;

/**
 *
 * The total number of bytes hold by the referenced buffer is:
 * getComponentSize()* getComponentNumber() * getElementNumber()
 *
 */
public interface GLArrayData {

    /**
     * Returns true if this data set is intended for a GLSL vertex shader attribute,
     * otherwise false, ie intended for fixed function vertex pointer
     */
    public boolean isVertexAttribute();

    /**
     * The index of the predefined array index, see list below,
     * or -1 in case of a shader attribute array.
     *
     * @see javax.media.opengl.GL#GL_VERTEX_ARRAY
     * @see javax.media.opengl.GL#GL_NORMAL_ARRAY
     * @see javax.media.opengl.GL#GL_COLOR_ARRAY
     * @see javax.media.opengl.GL#GL_TEXTURE_COORD_ARRAY
     */
    public int getIndex();

    /**
     * The name of the reflecting shader array attribute.
     */
    public String getName();

    /**
     * Set a new name for this array.
     */
    public void setName(String newName);


    /**
     * Returns the shader attribute location for this name,
     * -1 if not yet determined
     */
    public int getLocation();

    /**
     * Sets the determined location of the shader attribute
     * This is usually done within ShaderState.
     *
     * @see javax.media.opengl.glsl.ShaderState#glVertexAttribPointer(GL2ES2, GLArrayData)
     */
    public void setLocation(int v);

    /**
     * Determines wheather the data is server side (VBO),
     * or a client side array (false).
     */
    public boolean isVBO();

    /**
     * The offset, if it's an VBO, otherwise -1
     */
    public long getOffset();

    /**
     * The VBO name, if it's an VBO, otherwise -1
     */
    public int getVBOName();

    /**
     * The Buffer holding the data, may be null in case of VBO
     */
    public Buffer getBuffer();

    /**
     * The number of components per element
     */
    public int getComponentNumber();

    /**
     * The component's GL data type, ie. GL_FLOAT
     */
    public int getComponentType();

    /**
     * The components size in bytes
     */
    public int getComponentSize();

    /**
     * Return the number of elements.
     */
    public int getElementNumber();

    /**
     * True, if GL shall normalize fixed point data while converting 
     * them into float
     */
    public boolean getNormalized();

    /**
     * The distance to the next payload,
     * allowing interleaved arrays.
     */
    public int getStride();

    public String toString();

    public void destroy(GL gl);

}

hl opt">(); if ((curOffset % sz) != 0) { curOffset += sz - (curOffset % sz); } f.setOffset(curOffset); if (t.isUnion()) { maxSize = Math.max(maxSize, sz); } else { curOffset += sz; } } else if (ft.isCompound()) { new StructLayout(0, structAlignment).layout(ft.asCompound()); if ((curOffset % structAlignment) != 0) { curOffset += structAlignment - (curOffset % structAlignment); } f.setOffset(curOffset); if (t.isUnion()) { maxSize = Math.max(maxSize, ft.getSize()); } else { curOffset += ft.getSize(); } } else if (ft.isArray()) { ArrayType arrayType = ft.asArray(); CompoundType compoundElementType = arrayType.getBaseElementType().asCompound(); if (compoundElementType != null) { new StructLayout(0, structAlignment).layout(compoundElementType); arrayType.recomputeSize(); } // Note: not sure how this rounding is done if ((curOffset % structAlignment) != 0) { curOffset += structAlignment - (curOffset % structAlignment); } f.setOffset(curOffset); curOffset += ft.getSize(); } else { // FIXME String name = t.getName(); if (name == null) { name = t.toString(); } throw new RuntimeException("Complicated field types (" + ft + " " + f.getName() + " in type " + name + ") not implemented yet"); } } // FIXME: I think the below is wrong; better check with some examples // if ((curOffset % structAlignment) != 0) { // curOffset += structAlignment - (curOffset % structAlignment); // } if (t.isUnion()) { t.setSize(maxSize); } else { t.setSize(curOffset); } } public static StructLayout createForCurrentPlatform() { String os = System.getProperty("os.name").toLowerCase(); String cpu = System.getProperty("os.arch").toLowerCase(); if ((os.startsWith("windows") && cpu.equals("x86")) || (os.startsWith("linux") && cpu.equals("i386")) || (os.startsWith("sunos") && cpu.equals("sparc")) || (os.startsWith("sunos") && cpu.equals("x86"))|| (os.startsWith("mac os") && cpu.equals("ppc")) ) { // FIXME: make struct alignment configurable? May need to change // packing rules on a per-type basis? return new StructLayout(0, 8); } else { // FIXME: add more ports throw new RuntimeException("Please port StructLayout to your OS (" + os + ") and CPU (" + cpu + ")"); } } }