如何将linmath.h矩阵传递给glsl着色器？

Question

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?

Answer 1

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.