glUniform2f

glUniform2f is a function in the OpenGL programming interface used to set the value of a uniform variable of type floating-point vector of two components (vec2) within a shader program. When you use glUniform2f, you are essentially sending data from your application to be used by the vertex or fragment shaders during rendering.

The function signature typically looks like this: void glUniform2f(int location, float v0, float v1); The 'location' parameter specifies the uniform variable you want to modify. This location is obtained by calling glGetUniformLocation with the name of the uniform variable as defined in your shader code. The 'v0' and 'v1' parameters are the two floating-point values that will be assigned to the vec2 uniform variable.

It's crucial to ensure that the uniform variable in your shader is indeed declared as a vec2. If you attempt to set a uniform of a different type or size using glUniform2f, it can lead to undefined behavior or rendering errors. This function is commonly used to pass data like texture coordinates, offsets, or simple directional vectors to shaders. For instance, you might use it to update the position of an object or to control a color gradient. Remembering to call glUniform2f after binding your shader program using glUseProgram is a standard practice.