openGL es2.0 创建颜色球

阳光穿透心脏的1/2处 2022-08-06 12:16 152阅读 0赞

创建带有颜色的球体:

一、Java代码：

package com.gzdxid.utils;
    
    import java.nio.ByteBuffer;
    import java.nio.ByteOrder;
    import java.nio.FloatBuffer;
    import java.util.ArrayList;
    
    import android.opengl.GLES20;
    
    
    public class DrawBallColor {
    
    	int mProgram;
    	int muMVPMatrixHandle;
    	int maPositionHandle;
    	
    	int muColorRHandle;
    	int muColorGHandle;
    	int muColorBHandle;
    	int muColorAHandle;
    	
    	FloatBuffer mVertexBuffer;
    	int vCount=0;
    	
    	final float UNIT_SIZE=0.5f;
    	final float angleSpan=10f;
    	float R=0;
    	
    	public DrawBallColor(float r,int mProgram) {
    		// TODO Auto-generated constructor stub
    		initVertex(r);
    		initShader(mProgram);
    	}
    
    	private void initVertex(float r) {
    		// TODO Auto-generated method stub
    		R=r;
    		ArrayList<Float>alVertix=new ArrayList<Float>();
    		for(float vAngle=90;vAngle>-90;vAngle-=angleSpan){
    			for(float hAngle=360;hAngle>0;hAngle-=angleSpan){
    				float x1=getCoor(0, vAngle, hAngle);
    				float y1=getCoor(1, vAngle, hAngle);
    				float z1=getCoor(2, vAngle, hAngle);
    				
    				float x2=getCoor(0, vAngle-angleSpan, hAngle);
    				float y2=getCoor(1, vAngle-angleSpan, hAngle);
    				float z2=getCoor(2, vAngle-angleSpan, hAngle);
    				
    				float x3=getCoor(0, vAngle-angleSpan, hAngle-angleSpan);
    				float y3=getCoor(1, vAngle-angleSpan, hAngle-angleSpan);
    				float z3=getCoor(2, vAngle-angleSpan, hAngle-angleSpan);
    				
    				float x4=getCoor(0, vAngle, hAngle-angleSpan);
    				float y4=getCoor(1, vAngle, hAngle-angleSpan);
    				float z4=getCoor(2, vAngle, hAngle-angleSpan);
    				
    				alVertix.add(x1);alVertix.add(y1);alVertix.add(z1);
            		alVertix.add(x2);alVertix.add(y2);alVertix.add(z2);
            		alVertix.add(x4);alVertix.add(y4);alVertix.add(z4);        		
            		//构建第二三角形
            		alVertix.add(x4);alVertix.add(y4);alVertix.add(z4);
            		alVertix.add(x2);alVertix.add(y2);alVertix.add(z2);
            		alVertix.add(x3);alVertix.add(y3);alVertix.add(z3); 
    			}
    		}
    		 vCount=alVertix.size()/3;
    	        float vertices[]=new float[vCount*3];
    	    	for(int i=0;i<alVertix.size();i++){
    	    		vertices[i]=alVertix.get(i);
    	    	}
    	        ByteBuffer vbb = ByteBuffer.allocateDirect(vertices.length*4);
    	        vbb.order(ByteOrder.nativeOrder());
    	        mVertexBuffer = vbb.asFloatBuffer();
    	        mVertexBuffer.put(vertices);
    	        mVertexBuffer.position(0);
    	}
    
    	private void initShader(int mProgram) {
    		// TODO Auto-generated method stub
    		this.mProgram=mProgram;
    		muMVPMatrixHandle=GLES20.glGetUniformLocation(mProgram, "uMVPMatrix");
    		maPositionHandle=GLES20.glGetAttribLocation(mProgram, "aPosition");
    		muColorRHandle=GLES20.glGetUniformLocation(mProgram, "uColorR");
    		muColorGHandle=GLES20.glGetUniformLocation(mProgram, "uColorG");
    		muColorBHandle=GLES20.glGetUniformLocation(mProgram, "uColorB");
    		muColorAHandle=GLES20.glGetUniformLocation(mProgram, "uColorA");
    	}
    	
    	public void drawSelf(float r,float g,float b,float a){
    		GLES20.glUseProgram(mProgram);
    		GLES20.glUniformMatrix4fv(muMVPMatrixHandle, 1, false, MatrixState.getFinalMatrix(), 0);
    		GLES20.glUniform1f(muColorRHandle, r);
    		GLES20.glUniform1f(muColorGHandle, g);
    		GLES20.glUniform1f(muColorBHandle, b);
    		GLES20.glUniform1f(muColorAHandle, a);
    		GLES20.glVertexAttribPointer(maPositionHandle, 3, GLES20.GL_FLOAT, false, 3*4, mVertexBuffer);
    		GLES20.glEnableVertexAttribArray(maPositionHandle);
    		GLES20.glDrawArrays(GLES20.GL_TRIANGLES, 0, vCount);
    	}
    	
    	public float getCoor(int which,float vAngle,float hAngle){
    		switch (which) {
    		case 0://x
    			return (float) (R*UNIT_SIZE*Math.cos(Math.toRadians(vAngle))*Math.cos(Math.toRadians(hAngle)));
    		case 1://y
    			return (float) (R*UNIT_SIZE*Math.sin(Math.toRadians(vAngle)));
    		case 2://z
    			return (float) (R*UNIT_SIZE*Math.cos(Math.toRadians(vAngle))*Math.sin(Math.toRadians(hAngle)));
    		}
    		return 0;
    	}
    	
    }

二、定点着色器：

<pre name="code" class="plain">uniform mat4 uMVPMatrix;
    attribute vec3 aPosition;
    
    void main(){
        gl_Position=uMVPMatrix*vec4(aPosition,1); 
    }

三、片源着色器：

precision mediump float;
    
    uniform float uColorR;
    uniform float uColorG;
    uniform float uColorB;
    uniform float uColorA;
    
    void main(){
        vec4 finalColor;
        finalColor=vec4(uColorR,uColorG,uColorB,uColorA);
        gl_FragColor=finalColor;
    }