UwUGL/shaders/vgradientshader.cpp

#pragma once

#include <stdint.h>

#include "../datatypes.cpp"
#include "../helpers.cpp"
#include "../buffer.cpp"
#include "shaderbase.cpp"

namespace UwU {
  class VGradientShader : public ShaderBase<VGradientShader> {
    public:
      VGradientShader(uint16_t v0, uint16_t v1, Color c0, Color c1) {
        this->v0 = (uint32_t)v0;
        this->vScale = 0xffffffff / (1 + (uint32_t)v1 - (uint32_t)v0);
        this->c0 = c0;
        this->c1 = c1;
      }
      uint32_t v0;
      uint32_t vScale;
      Color c0;
      Color c1;

      Color shade(uint16_t u, uint16_t v) {
        (void)u;
        uint32_t t = (((uint32_t)v - v0) * vScale) / 0x01000000;
        return Helpers::lerpColor(c0, c1, (uint8_t)t);
     }
  };
}