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attribute vec4 a_Position;

attribute vec4 a_TexCoordinate;

uniform mat4 mMatrix;

uniform mat4 mTextureMatrix;

varying vec4 v_TexCoord;

void main()

{

v_TexCoord = mTextureMatrix * a_TexCoordinate;

gl_Position = mMatrix * a_Position;

}

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增加mTextureMatrix纹理矩阵，mTextureMatrix作用在纹理坐标上。

片段shader修改如下：

#extension GL_OES_EGL_image_external : require

precision mediump float;

uniform samplerExternalOES u_Texture;

varying vec4 v_TexCoord;

void main()

{

gl_FragColor = texture2D(u_Texture, v_TexCoord.xy);

}

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v_TexCoord类型由vec2变为vec4，采样的时候使用v_TexCoord.xy。

获取mTextureMatrix纹理矩阵参数句柄，代码如下：