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copenglmatrixtypesglsl
nebuch
nebuch

Reputation: 7055

How to pass linmath.h matrices to glsl shader?

I'm learning the linmath.h library, but I'm having trouble passing matrices made by it in my main program to my vert shader:

#include "linmath.h"
…
GLint mat_uniform_handle = glGetUniformLocation(shade_program_handle, "matrix");
…
mat4x4 M;
mat4x4_identity(M);
glUniformMatrix4fv(mat_uniform_handle, 1, GL_FALSE, M);

But of course that gives me a type error because linmath matrices have the type float (*)[4] and glUniformMatrix4fv takes the type const GLfloat *.

I tried writing my own converter that concated the columns of the matrix into a single array, then returned a pointer to the first element, but that didn't work.

Am I missing some function of linmath.h that does this conversion for me? If not, how do I properly convert a linmath.h matrix to an opengl matrix?

Upvotes: 3

Views: 967

Answers (1)

nebuch
nebuch

Reputation: 7055

It's pathetic that I didn't try this before asking here, but here's the solution, just a straight cast.:

glUniformMatrix4fv(mat_uniform_handle, 1, GL_FALSE, (GLfloat *)M);

Hope this helps someone.

Upvotes: 4

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