GLSL 最简单的Shader
const char *vertexShader = {"void main() {\n\
gl_TexCoord = gl_MultiTexCoord0;\n\
gl_Position = ftransform();\n\
}\n"
};
const char *fragmentShader = {
"uniform sampler2D sampler;//纹理\n\
void main() {\n\
gl_FragColor = texture2D(sampler, gl_TexCoord.st);//原图\n\
}\n"
};
文档来源：51CTO技术博客https://blog.51cto.com/u_15298588/3034122
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