Retrieve the value of gl_FragColor
This site talk about how to use opengl es2.0 to do gpgpu The problem of mine is how to retrieve the value of gl_FragColor back to the cpu site(host)?
fragment shader
varying vec2 fragTexCoord;
void main() {
gl_FragColor = texture2D(tex, fragTexCoord);
}
cpu site
//.......
glDrawArrays(GL_TRIANGLES, 0, 3);
//How could I get the value after draw?
This site talk about how to use opengl es2.0 to do gpgpu The problem of mine is how to retrieve the value of gl_FragColor back to the cpu site(host)?
fragment shader
varying vec2 fragTexCoord;
void main() {
gl_FragColor = texture2D(tex, fragTexCoord);
}
cpu site
//.......
glDrawArrays(GL_TRIANGLES, 0, 3);
//How could I get the value after draw?
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