package zephr

import "core:fmt"

import gl "vendor:OpenGL"

Shader :: struct {
  program: u32
}

create_shader :: proc(vertex_path: string, fragment_path: string) -> (Shader, bool) {
  shader: Shader

  program, success := gl.load_shaders(vertex_path, fragment_path)
  shader.program = program

  return shader, success
}

use_shader :: proc(shader: Shader) {
  gl.UseProgram(shader.program)
}

set_mat4f :: proc(shader: Shader, name: cstring, mat4: Mat4, transpose: bool = false) {
  mat4 := mat4
  loc := gl.GetUniformLocation(shader.program, name)
  gl.UniformMatrix4fv(loc, 1, transpose, raw_data(&mat4))
}

set_float :: proc(shader: Shader, name: cstring, val: f32) {
  loc := gl.GetUniformLocation(shader.program, name)
  gl.Uniform1f(loc, val)
}

set_int :: proc(shader: Shader, name: cstring, val: i32) {
  loc := gl.GetUniformLocation(shader.program, name)
  gl.Uniform1i(loc, val)
}

set_bool :: proc(shader: Shader, name: cstring, val: bool) {
  set_int(shader, name, cast(i32)val)
}

set_vec2f :: proc(shader: Shader, name: cstring, val1: f32, val2: f32) {
  loc := gl.GetUniformLocation(shader.program, name)
  gl.Uniform2f(loc, val1, val2)
}

set_vec3f :: proc(shader: Shader, name: cstring, val1: f32, val2: f32, val3: f32) {
  loc := gl.GetUniformLocation(shader.program, name)
  gl.Uniform3f(loc, val1, val2, val3)
}

set_vec4f :: proc(shader: Shader, name: cstring, val1: f32, val2: f32, val3: f32, val4: f32) {
  loc := gl.GetUniformLocation(shader.program, name)
  gl.Uniform4f(loc, val1, val2, val3, val4)
}