openGL es2.0 创建颜色平面和文理平面

浅浅的花香味﹌ 2022-08-06 11:08 123阅读 0赞

一、创建颜色平面的Java代码和Shader Language：

package com.gzdxid.utils;
    
    import java.nio.ByteBuffer;
    import java.nio.ByteOrder;
    import java.nio.FloatBuffer;
    
    import android.opengl.GLES20;
    
    
    public class DrawRectColor {
    	int mProgram;
    	int muMVPMatrixHandle;
    	int maPositionHandle;
    	
    	int muColorRHandle;
    	int muColorGHandle;
    	int muColorBHandle;
    	int muColorAHandle;
    	
    	FloatBuffer mVertexBuffer;
    	int vCount = 0;
    	float r,g,b,a;
    	
    	public DrawRectColor(float width,float height,int mProgam) {
        	initVertexData(width,height);
        	intShader(mProgam);
    	}
    
    	private void initVertexData(float width,float height) {
    		// TODO Auto-generated method stub
    		vCount = 6;
    		float w = width / 2;
    		float h = height / 2;
    		float vertices[] = new float[] { 
    		-w,  h, 0,
    		-w, -h, 0,
    		 w, -h, 0,
    		 w, -h, 0,
    		 w,  h, 0,
    		-w,  h, 0,
    
    		};
    		ByteBuffer vbb = ByteBuffer.allocateDirect(vertices.length * 4);
    		vbb.order(ByteOrder.nativeOrder());
    		mVertexBuffer = vbb.asFloatBuffer();
    		mVertexBuffer.put(vertices);
    		mVertexBuffer.position(0);
    
    		
    	}
    
    	private void intShader(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);
    	}
    	
    	
    }

定点着色器代码：

uniform mat4 uMVPMatrix;
    attribute vec3 aPosition;
    
    void main(){
        gl_Position=uMVPMatrix*vec4(aPosition,1); 
    }

片源着色器代码：

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;
    }

二、创建文理平面的Java代码和Shader Language：

package com.gzdxid.utils;
    
    import java.nio.ByteBuffer;
    import java.nio.ByteOrder;
    import java.nio.FloatBuffer;
    
    import android.opengl.GLES20;
    
    public class DrawRectTexture {
    	int mProgram;
    	int muMVPMatrixHandle;
    	int maPositionHandle;
    	int maTexCoorHandle;
    
    	FloatBuffer mVertexBuffer;
    	FloatBuffer mTexCoorBuffer;
    
    	int vCount = 0;
    
    	public DrawRectTexture(float width, float height, int mProgam) {
    		// TODO Auto-generated constructor stub
    		initVertexData(width, height);
    		intShader(mProgam);
    	}
    
    	private void initVertexData(float width, float height) {
    		// TODO Auto-generated method stub
    		vCount = 6;
    		float w = width / 2;
    		float h = height / 2;
    		float vertices[] = new float[] { 
    		-w,  h, 0,
    		-w, -h, 0,
    		 w, -h, 0,
    		 w, -h, 0,
    		 w,  h, 0,
    		-w,  h, 0,
    
    		};
    		ByteBuffer vbb = ByteBuffer.allocateDirect(vertices.length * 4);
    		vbb.order(ByteOrder.nativeOrder());
    		mVertexBuffer = vbb.asFloatBuffer();
    		mVertexBuffer.put(vertices);
    		mVertexBuffer.position(0);
    
    		float texCoor[] = new float[] { 0, 0, 0, 1, 1, 1, 1, 1, 1, 0, 0, 0 };
    		ByteBuffer cbb = ByteBuffer.allocateDirect(texCoor.length * 4);
    		cbb.order(ByteOrder.nativeOrder());
    		mTexCoorBuffer = cbb.asFloatBuffer();
    		mTexCoorBuffer.put(texCoor);
    		mTexCoorBuffer.position(0);
    
    	}
    
    	private void intShader(int mProgam) {
    		// TODO Auto-generated method stub
    		this.mProgram = mProgam;
    		muMVPMatrixHandle = GLES20.glGetUniformLocation(mProgam, "uMVPMatrix");
    		maPositionHandle = GLES20.glGetAttribLocation(mProgam, "aPosition");
    		maTexCoorHandle = GLES20.glGetAttribLocation(mProgam, "aTexCoor");
    	}
    
    	public void drawSelf(int texId) {
    		GLES20.glUseProgram(mProgram);
    		GLES20.glUniformMatrix4fv(muMVPMatrixHandle, 1, false, MatrixState.getFinalMatrix(), 0);
    		GLES20.glVertexAttribPointer(maPositionHandle, 3, GLES20.GL_FLOAT, false, 3 * 4, mVertexBuffer);
    		GLES20.glVertexAttribPointer(maTexCoorHandle, 2, GLES20.GL_FLOAT, false, 2 * 4, mTexCoorBuffer);
    		GLES20.glEnableVertexAttribArray(maPositionHandle);
    		GLES20.glEnableVertexAttribArray(maTexCoorHandle);
    		GLES20.glActiveTexture(GLES20.GL_TEXTURE0);
    		GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, texId);
    		GLES20.glDrawArrays(GLES20.GL_TRIANGLES, 0, vCount);
    	}
    
    }

定点着色器代码：

uniform mat4 uMVPMatrix;
    attribute vec3 aPosition;
    attribute vec2 aTexCoor;
    varying vec2 vTextureCoord;
    
    void main(){
        gl_Position=uMVPMatrix*vec4(aPosition,1); 
        vTextureCoord=aTexCoor;
    }

片源着色器代码：

precision mediump float;
    
    varying vec2 vTextureCoord;
    uniform sampler2D sTexture;
    
    void main(){
        gl_FragColor=texture2D(sTexture,vTextureCoord);
    }