Question

I need to translate vertices by an X and a Y value. I have tried the code below with a uniform of the translation I want but it doesn’t work.

translationX and translationY were assigned to uniforms with code similar to:

int my_value_loc = glGetUniformLocation(shader, "translationX");
glUniform1f(my_value_loc, 10.0f);

Here is my shader:

#version 330
uniform float translationX;
uniform float translationY;
void main(){
    gl_Position=vec4(vVertex.x+translationX, vVertex.y+translationY, 0.0,
}

Answer 1

I’d prefer sending a translation matrix.

shader code:

uniform mat4 trans;
attribute vec3 vertex;

void main()
{
    gl_Position = trans * vec4(vertex, 1.0);
}