122 lines
3.8 KiB
Kotlin
122 lines
3.8 KiB
Kotlin
package com.xscm.moduleutil.widget
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import android.graphics.SurfaceTexture
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import android.opengl.GLES20
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import android.opengl.Matrix
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class ChannelSplitRenderer {
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private val vertexShaderCode = """
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attribute vec4 aPosition;
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attribute vec2 aTexCoord;
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varying vec2 vTexCoord;
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void main() {
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gl_Position = aPosition;
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vTexCoord = aTexCoord;
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}
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"""
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private val fragmentShaderCode = """
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precision mediump float;
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uniform sampler2D uTexture;
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varying vec2 vTexCoord;
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void main() {
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// 只使用左半部分作为最终颜色
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vec2 leftCoord = vec2(vTexCoord.x * 0.5, vTexCoord.y);
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vec4 color = texture2D(uTexture, leftCoord);
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// 设置 alpha 为 1.0 表示完全不透明，或根据需求设为 0.0 表示全透明
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gl_FragColor = vec4(color.rgb, 0.0); // 左通道颜色 + 不透明
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}"""
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private var program = 0
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private var positionHandle = 0
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private var texCoordHandle = 0
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private var textureHandle = 0
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private val projectionMatrix = FloatArray(16)
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private val modelMatrix = FloatArray(16)
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fun onSurfaceCreated(surface: SurfaceTexture, width: Int, height: Int) {
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// 初始化着色器
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val vertexShader = ShaderUtils.loadShader(GLES20.GL_VERTEX_SHADER, vertexShaderCode)
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val fragmentShader = ShaderUtils.loadShader(GLES20.GL_FRAGMENT_SHADER, fragmentShaderCode)
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program = GLES20.glCreateProgram().also {
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GLES20.glAttachShader(it, vertexShader)
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GLES20.glAttachShader(it, fragmentShader)
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GLES20.glLinkProgram(it)
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}
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positionHandle = GLES20.glGetAttribLocation(program, "aPosition")
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texCoordHandle = GLES20.glGetAttribLocation(program, "aTexCoord")
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textureHandle = GLES20.glGetUniformLocation(program, "uTexture")
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// 初始化矩阵
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Matrix.setIdentityM(projectionMatrix, 0)
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Matrix.setIdentityM(modelMatrix, 0)
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GLES20.glClearColor(0.0f, 0.0f, 0.0f, 0.0f)
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GLES20.glEnable(GLES20.GL_BLEND)
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GLES20.glBlendFunc(GLES20.GL_SRC_ALPHA, GLES20.GL_ONE_MINUS_SRC_ALPHA)
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}
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fun onSurfaceChanged(width: Int, height: Int) {
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GLES20.glViewport(0, 0, width, height)
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}
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fun onDrawFrame(textureId: Int) {
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GLES20.glClear(GLES20.GL_COLOR_BUFFER_BIT)
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GLES20.glUseProgram(program)
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// 定义顶点坐标（全屏）
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val vertices = floatArrayOf(
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-1.0f, -1.0f, 0.0f,
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1.0f, -1.0f, 0.0f,
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-1.0f, 1.0f, 0.0f,
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1.0f, 1.0f, 0.0f
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)
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// 修改纹理坐标，只映射左半部分视频内容到左侧屏幕
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val texCoords = floatArrayOf(
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0.0f, 1.0f, // 左下角
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0.5f, 1.0f, // 右下角（对应视频中间）
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0.0f, 0.0f, // 左上角
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0.5f, 0.0f // 右上角
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)
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val vertexBuffer = ShaderUtils.createFloatBuffer(vertices)
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val texBuffer = ShaderUtils.createFloatBuffer(texCoords)
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GLES20.glEnableVertexAttribArray(positionHandle)
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GLES20.glVertexAttribPointer(
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positionHandle, 3,
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GLES20.GL_FLOAT, false,
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0, vertexBuffer
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)
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GLES20.glEnableVertexAttribArray(texCoordHandle)
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GLES20.glVertexAttribPointer(
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texCoordHandle, 2,
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GLES20.GL_FLOAT, false,
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0, texBuffer
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)
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// 绑定纹理
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GLES20.glActiveTexture(GLES20.GL_TEXTURE0)
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GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, textureId)
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GLES20.glUniform1i(textureHandle, 0)
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// 绘制
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GLES20.glDrawArrays(GLES20.GL_TRIANGLE_STRIP, 0, 4)
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// 清理
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GLES20.glDisableVertexAttribArray(positionHandle)
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GLES20.glDisableVertexAttribArray(texCoordHandle)
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}
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fun release() {
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GLES20.glDeleteProgram(program)
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}
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} |