Sign Up to our social questions and Answers Engine to ask questions, answer people’s questions, and connect with other people.
Login to our social questions & Answers Engine to ask questions answer people’s questions & connect with other people.
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Please briefly explain why you feel this question should be reported.
Please briefly explain why you feel this answer should be reported.
Please briefly explain why you feel this user should be reported.
Will OpenGL automatically truncate it or is this an error?
I have a piece of nasty OpenGL code that seems to be setting an array of float4x3 in the program by using glUniform4fv with a big array that has float4 values in it (i.e. 4 floats per row instead of 3), and it seems to work. That is OpenGL only copies 3 values to each row of the matrix and skips the 4th one. Is it OK to assume this will always work?
The GLSL specification is quite clear on this: the size and type for
glUniform*calls must exactly match the size and type declared in the shader (except for samplers and booleans). So if you callglUniform4fv, you must be setting either a single variable of typevec4or an array ofcountentries in an array variable of typevec4.