UwUGL/primatives/rectangle.cpp

#pragma once

#include <stdint.h>

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

namespace UwU {
  // rectangle
  class Rectangle {
    public:
      Rectangle(uint16_t x0, uint16_t y0, uint16_t x1, uint16_t y1) {
        this->x0 = x0;
        this->y0 = y0;
        this->x1 = x1;
        this->y1 = y1;
      }
      Rectangle() {}
      uint16_t x0;
      uint16_t y0;
      uint16_t x1;
      uint16_t y1;
      
      // Draw a rectangle
      void draw (Buffer buffer, Shader shader) {
        if (x0 > buffer.width || y0 > buffer.height || x1 > buffer.width || y1 > buffer.height) {return;};
        if (shader.shaderType == COLOR) {
          for (uint16_t y = y0; y < y1; y++) {
            for (uint16_t x = x0; x < x1; x++) {
              buffer.drawPixel(x, y, shader.c0);
            }
          }
          return;

        } else if (shader.shaderType == HGRADIENT) {

          // Precompute gradient LUT
          Color cols[x1 - x0];
          for (uint16_t x = x0; x < x1; x++) {
            cols[x - x0] = ShaderMethods::gradient(shader.u0, shader.scale, shader.c0, shader.c1, x);
          }

          for (uint16_t y = y0; y < y1; y++) {
            for (uint16_t x = x0; x < x1; x++) {
            buffer.drawPixel(x, y, cols[x - x0]);
            }
          }
          return;
          
        } else if (shader.shaderType == VGRADIENT) {
          for (uint16_t y = y0; y < y1; y++) {
            Color c = ShaderMethods::gradient(shader.v0, shader.scale, shader.c0, shader.c1, y);
            for (uint16_t x = x0; x < x1; x++) {
              buffer.drawPixel(x, y, c);
            }
          }
          return;

        } else if (shader.shaderType == BUFFER) {
          for (uint16_t y = y0; y < y1; y++) {
            for (uint16_t x = x0; x < x1; x++) {
              buffer.drawPixel(x, y, ShaderMethods::buffer(shader.u0, shader.v0, shader.buffer, x, y));
            }
          }
          return;
        }
        return;
      }
  };
}