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openglmodeglreadpixels

glfwOpenWindow and glReadPixels modes?

Suppose I open a glfw window with:

glfwOpenWindow(width, height, 8,8,8,8,8,8, GLFW_WINDOW);

Then, I try to read it back with:

glReadPixels(0, 0, width, height, ..1.., ..2..);

I'm not sure what I should be putting in as ..1.. and ..2.. ; I think ..1.. should be GL_RGBA, but no idea for ..2..

Thanks!

Solution

  • Don't know if it helps, but I've found this article on GPWiki about glfwOpenWindow and the openGL docs for glReadPixels.

    I've played with openGL a bit, but I haven't used these functions. Could you try something basic like:

    glfwOpenWindow(width, height, 8,8,8,0,0,0, GLFW_WINDOW);

    and 

    glReadPixels(0, 0, width, height, GL_RGB, GL_FLOAT);

    And see if you get the right result or anything close, then incrementally add the details you need, like testing:

    glfwOpenWindow(width, height, 8,8,8,8,0,0, GLFW_WINDOW);

    then

    glReadPixels(0, 0, width, height, GL_RGBA, GL_FLOAT);

    and so on.