Noob question. How do I use hmm_m4 with the OpenGL function below?
When I try, I get the error "void (GLint,GLsizei,GLboolean,const GLfloat *)': cannot convert argument 4 from 'hmm_m4 *' to 'const GLfloat *"
1 | void glUniformMatrix4fv(GLint location, GLsizei count, GLboolean transpose, Const GLfloat *value); |
When I try, I get the error "void (GLint,GLsizei,GLboolean,const GLfloat *)': cannot convert argument 4 from 'hmm_m4 *' to 'const GLfloat *"
It looks like hmm_m4 is a double array of floats of size 4x4 with the name of the array as Elements.
So give something like this a try to give it a pointer to the first float location in the double array:
So give something like this a try to give it a pointer to the first float location in the double array:
1 | glUniformMatrix4fv(location, 1, GL_FALSE, &MatrixName.Elements[0][0]); |
Edited by Kevin
on
What is hmm_m4?
If it is POD (plain old data) type then casting it to float point will work fine, just take care transpose parameter:
If it is POD (plain old data) type then casting it to float point will work fine, just take care transpose parameter:
1 2 | hmm_m4 m = ...; glUniformMatrix4fv(location, 1, transpose, (float*)&m); |
Edited by Mārtiņš Možeiko
on
Thanks Kevn, mmozeiko!
I ultimately went with mmozeiko solution for brevity. The data is POD and so the float * cast does the job perfectly.
Edit : Replacing glm with HMM improved by compilation time two fold. :)
I ultimately went with mmozeiko solution for brevity. The data is POD and so the float * cast does the job perfectly.
1 2 3 4 5 6 | typedef union hmm_mat4
{
float Elements[4][4];
} hmm_mat4;
typedef hmm_mat4 hmm_m4;
|
Edit : Replacing glm with HMM improved by compilation time two fold. :)
Edited by Jesse
on
Hello, and sorry for the late response!
In my own code base i do:
But your solution should work just fine :)
Thank you for using Handmade-Math, if its missing any features or if there is anything you would like to add i am accepting pull requests on the github page.
In my own code base i do:
1 | glUniformMatrix4fv(MatrixID, 1, GL_FALSE, &MVP.Elements[0][0]); |
But your solution should work just fine :)
Thank you for using Handmade-Math, if its missing any features or if there is anything you would like to add i am accepting pull requests on the github page.