OpenGL|Android OpenGL ES基本用法（11），简单滤镜操作 OpenGL|音视频

目录 【OpenGL|Android OpenGL ES基本用法（11），简单滤镜操作】加入简单的滤镜操作

文章图片

fragment_shader1.glsl

precision mediump float; varying vec2 ft_Position; uniform sampler2D sTexture; void main() { gl_FragColor = vec4(vec3(1.0 - texture2D(sTexture, ft_Position)), 1.0); }

fragment_shader2.glsl

precision mediump float; varying vec2 ft_Position; uniform sampler2D sTexture; void main() { lowp vec4 textureColor = texture2D(sTexture, ft_Position); float gray = textureColor.r * 0.2125 + textureColor.g * 0.7154 + textureColor.b * 0.0721; gl_FragColor = vec4(gray, gray, gray, textureColor.w); }

fragment_shader3.glsl

precision mediump float; varying vec2 ft_Position; uniform sampler2D sTexture; void main() { lowp vec4 textureColor = texture2D(sTexture, ft_Position); gl_FragColor = vec4((textureColor.rgb + vec3(-0.5f)), textureColor.w); }

读取shader的时候，读取各自对应的

package com.example.opengl.eglpic; import android.content.Context; import android.opengl.GLES20; import com.example.opengl.R; import com.example.opengl.egl.MyGlSurfaceView; import com.example.opengl.egl.ShaderUtil; import java.nio.ByteBuffer; import java.nio.ByteOrder; import java.nio.FloatBuffer; public class PicRenderMulti implements MyGlSurfaceView.EGLRender {private Context context; private float[] vertexData = https://www.it610.com/article/{ -1f, -1f, 1f, -1f, -1f, 1f, 1f, 1f }; private FloatBuffer vertexBuffer; private float[] fragmentData = { 0f, 1f, 1f, 1f, 0f, 0f, 1f, 0f }; private FloatBuffer fragmentBuffer; private int program; private int vPosition; private int fPosition; private int sampler; private int vboId; private int textureId; private int curIndex; public void setTextureId(int textureId, int curIndex) { this.textureId = textureId; this.curIndex = curIndex; }public PicRenderMulti(Context context) { this.context = context; vertexBuffer = ByteBuffer.allocateDirect(vertexData.length * 4) .order(ByteOrder.nativeOrder()) .asFloatBuffer() .put(vertexData); vertexBuffer.position(0); fragmentBuffer = ByteBuffer.allocateDirect(fragmentData.length * 4) .order(ByteOrder.nativeOrder()) .asFloatBuffer() .put(fragmentData); fragmentBuffer.position(0); }@Override public void onSurfaceCreated() { String vertexSource = ShaderUtil.readRawTxt(context, R.raw.vertex_shader); String fragmentSource; switch (curIndex) { case 0: fragmentSource = ShaderUtil.readRawTxt(context, R.raw.fragment_shader1); break; case 1: fragmentSource = ShaderUtil.readRawTxt(context, R.raw.fragment_shader2); break; case 2: fragmentSource = ShaderUtil.readRawTxt(context, R.raw.fragment_shader3); break; default: fragmentSource = ShaderUtil.readRawTxt(context, R.raw.fragment_shader); } program = ShaderUtil.createProgram(vertexSource, fragmentSource); vPosition = GLES20.glGetAttribLocation(program,"v_Position"); fPosition = GLES20.glGetAttribLocation(program, "f_Position"); sampler = GLES20.glGetUniformLocation(program, "sTexture"); int[] vbos = new int[1]; GLES20.glGenBuffers(1, vbos, 0); vboId = vbos[0]; GLES20.glBindBuffer(GLES20.GL_ARRAY_BUFFER, vboId); GLES20.glBufferData(GLES20.GL_ARRAY_BUFFER, vertexData.length * 4 + fragmentData.length * 4, null, GLES20.GL_STATIC_DRAW); GLES20.glBufferSubData(GLES20.GL_ARRAY_BUFFER, 0, vertexData.length * 4, vertexBuffer); GLES20.glBufferSubData(GLES20.GL_ARRAY_BUFFER, vertexData.length * 4, fragmentData.length * 4, fragmentBuffer); GLES20.glBindBuffer(GLES20.GL_ARRAY_BUFFER, 0); }@Override public void onSurfaceChanged(int width, int height) { GLES20.glViewport(0, 0, width, height); }@Override public void onDrawFrame() { GLES20.glClear(GLES20.GL_COLOR_BUFFER_BIT); GLES20.glClearColor(1f, 0f, 0f, 1f); GLES20.glUseProgram(program); GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, textureId); GLES20.glBindBuffer(GLES20.GL_ARRAY_BUFFER, vboId); GLES20.glEnableVertexAttribArray(vPosition); GLES20.glVertexAttribPointer(vPosition, 2, GLES20.GL_FLOAT, false, 8, 0); GLES20.glEnableVertexAttribArray(fPosition); GLES20.glVertexAttribPointer(fPosition, 2, GLES20.GL_FLOAT, false, 8, vertexData.length * 4); GLES20.glDrawArrays(GLES20.GL_TRIANGLE_STRIP, 0, 4); GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, 0); GLES20.glBindBuffer(GLES20.GL_ARRAY_BUFFER, 0); } }