/**
 * Copyright 2010 JogAmp Community. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification, are
 * permitted provided that the following conditions are met:
 *
 *    1. Redistributions of source code must retain the above copyright notice, this list of
 *       conditions and the following disclaimer.
 *
 *    2. Redistributions in binary form must reproduce the above copyright notice, this list
 *       of conditions and the following disclaimer in the documentation and/or other materials
 *       provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY JogAmp Community ``AS IS'' AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
 * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JogAmp Community OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * The views and conclusions contained in the software and documentation are those of the
 * authors and should not be interpreted as representing official policies, either expressed
 * or implied, of JogAmp Community.
 */
package jogamp.graph.curve.opengl;

import java.nio.FloatBuffer;

import javax.media.opengl.GL2ES2;
import javax.media.opengl.GLException;
import javax.media.opengl.GLUniformData;
import javax.media.opengl.fixedfunc.GLMatrixFunc;

import jogamp.graph.curve.text.GlyphString;

import com.jogamp.graph.curve.opengl.TextRenderer;
import com.jogamp.graph.font.Font;
import com.jogamp.graph.geom.Vertex;
import com.jogamp.opengl.util.glsl.ShaderCode;
import com.jogamp.opengl.util.glsl.ShaderProgram;

public class TextRendererImpl01 extends TextRenderer {    
	/**Sharpness is equivalent to the value of t value of texture coord
	 * on the off-curve vertex. The high value of sharpness will 
	 * result in high curvature.
	 */
    private GLUniformData mgl_sharpness = new GLUniformData("p1y", 0.5f);
    GLUniformData mgl_alpha = new GLUniformData("g_alpha", 1.0f);
    private GLUniformData mgl_color = new GLUniformData("g_color", 3, FloatBuffer.allocate(3));
    private GLUniformData mgl_strength = new GLUniformData("a_strength", 1.8f);
    	
	public TextRendererImpl01(Vertex.Factory<? extends Vertex> factory, int type) {
	    super(factory, type);
	}

	@Override
    protected boolean initImpl(GL2ES2 gl){
		boolean VBOsupported = gl.isFunctionAvailable("glGenBuffers") &&
			gl.isFunctionAvailable("glBindBuffer") &&
			gl.isFunctionAvailable("glBufferData") &&
			gl.isFunctionAvailable("glDrawElements") &&
			gl.isFunctionAvailable("glVertexAttribPointer") &&
			gl.isFunctionAvailable("glDeleteBuffers");
		
		if(DEBUG) {
			System.err.println("TextRendererImpl01: VBO Supported = " + VBOsupported);
		}
		
		if(!VBOsupported){
			return false;
		}
		
		gl.glEnable(GL2ES2.GL_BLEND);
		gl.glBlendFunc(GL2ES2.GL_SRC_ALPHA, GL2ES2.GL_ONE_MINUS_SRC_ALPHA);
		
        ShaderCode rsVp = ShaderCode.create(gl, GL2ES2.GL_VERTEX_SHADER, 1, TextRendererImpl01.class,
                "shader", "shader/bin", "curverenderer01");
        ShaderCode rsFp = ShaderCode.create(gl, GL2ES2.GL_FRAGMENT_SHADER, 1, TextRendererImpl01.class,
                "shader", "shader/bin", "curverenderer01");

        ShaderProgram sp = new ShaderProgram();
        sp.add(rsVp);
        sp.add(rsFp);

        if(!sp.link(gl, System.err)) {
            throw new GLException("TextRendererImpl01: Couldn't link program: "+sp);
        }

        st.attachShaderProgram(gl, sp);
        gl.glBindAttribLocation(sp.id(), 0, "v_position");
        gl.glBindAttribLocation(sp.id(), 1, "texCoord");
		
		st.glUseProgram(gl, true);

		pmvMatrix.glMatrixMode(GLMatrixFunc.GL_PROJECTION);
		pmvMatrix.glLoadIdentity();
		pmvMatrix.glMatrixMode(GLMatrixFunc.GL_MODELVIEW);
		pmvMatrix.glLoadIdentity();
		
		pmvMatrix.glMatrixMode(GLMatrixFunc.GL_PROJECTION);
		pmvMatrix.glLoadIdentity();
		resetModelview(null);
		
		mgl_PMVMatrix = new GLUniformData("mgl_PMVMatrix", 4, 4, pmvMatrix.glGetPMvMatrixf());		    		
		if(!st.glUniform(gl, mgl_PMVMatrix)) {
			if(DEBUG){
				System.err.println("Error setting PMVMatrix in shader: "+st);
			}
			return false;
		}
		
		if(!st.glUniform(gl, mgl_sharpness)) {
			if(DEBUG){
				System.err.println("Error setting sharpness in shader: "+st);
			}
			return false;
		}
				
		if(!st.glUniform(gl, mgl_alpha)) {
			if(DEBUG){
				System.err.println("Error setting global alpha in shader: "+st);
			}
			return false;
		}		
		
		if(!st.glUniform(gl, mgl_color)) {
			if(DEBUG){
				System.err.println("Error setting global color in shader: "+st);
			}
			return false;
		}		
		
		if(!st.glUniform(gl, mgl_strength)) {
			System.err.println("Error setting antialias strength in shader: "+st);
		}
		
		if(DEBUG) {
			System.err.println("TextRendererImpl01 initialized: " + Thread.currentThread()+" "+st);
		}
		return true;
	}
	
	@Override
    protected void disposeImpl(GL2ES2 gl) {
	}
	
    @Override
    public float getAlpha() {
        return mgl_alpha.floatValue();
    }

    @Override
    public void setAlpha(GL2ES2 gl, float alpha_t) {
        mgl_alpha.setData(alpha_t);
        if(null != gl && st.inUse()) {
            st.glUniform(gl, mgl_alpha);
        }
    }
	
	@Override
    public void setColor(GL2ES2 gl, float r, float g, float b){
	    FloatBuffer fb = (FloatBuffer) mgl_color.getBuffer();
	    fb.put(0, r);
	    fb.put(1, r);
	    fb.put(2, r);
	    if(null != gl && st.inUse()) {
	        st.glUniform(gl, mgl_color);
	    }
	}
	
	@Override
    public void renderString3D(GL2ES2 gl, Font font, String str, float[] position, int fontSize, int texSize) {
		if(!isInitialized()){
			throw new GLException("TextRendererImpl01: not initialized!");
		}
		GlyphString glyphString = getCachedGlyphString(font, str, fontSize);
		if(null == glyphString) {
			glyphString = createString(gl, font, fontSize, str, mgl_sharpness.floatValue());
			addCachedGlyphString(font, str, fontSize, glyphString);
		}
		
		glyphString.renderString3D(pmvMatrix, vp_width, vp_height, texSize);
	}
	
}