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c++openglglslglm-math

Pass data from std::vector to uniform array in glsl

I have a uniform in a shader like this:

uniform vec3 origins[10];

and a std::vector in my code like this:

std::vector<glm::vec3> origins;

that is filled with ten glm::vec3 elements.

Does anyone know how do I pass that to the shader? I thought:

GLint originsLoc = glGetUniformLocation(programID, "origins");
glUniform3fv(originsLoc, 10, origins.data());

would do it, but it wont compile. The error says there is no matching function for call to 'glUniform3fv'. How do I pass the data in the std::vector in a way that satisfies the glUniform3fv function?

Solution

  • You should use a GLfloat and not a glm::vec3, but here it is anyway:

    for (int i = 0; i != 10; i++) {
  GLint originsLoc = glGetUniformLocation(programID, "origins[i]");
  glUniform3f(originsLoc, origins[i].x, origins[i].y, origins[i].z);
}