I want to do the 3D-picking on OpenGl by the way of frame pick. On this way I need to use glReadPixel to get some information of the pixels on the screen currently, so I test it on the following way ...

I am rendering two triangles in GL. The bottom two vertices of each have a set alpha value to make them transparent. I am using Depth testing and Alpha blending defined by the following calls glEnable...

I am trying to make a game in C++ and using SDL2 with OpenGL. When I try to draw a simple triangle to the opengl context with GLEW nothing is showing up. I haven't used opengl before. Here is my code:...

OpenGL defines the following internal formats for sRGB color space: GL_SRGB GL_SRGB8 GL_SRGB_ALPHA GL_SRGB8_ALPHA8 Could you please explain why there are no sRGB/sRGBA equivalents for formats with ot...