raw_gradient.cpp

// This very simple example illustrates the concept of a framebuffer
// We do not really need any libraries or hardware to do computer graphics
// In this case the framebuffer is simply saved as a raw RGB and TGA image

#include <iostream>
#include <fstream>

// A header implementation of a TGAImage object
#include "tga.h"

// Size of the framebuffer
const unsigned int SIZE = 512;

// A simple RGB struct will represent a pixel in the framebuffer
// Note: unsigned char is range <0, 255>
//       signed char is range <-128, 127>
struct Pixel {
  unsigned char r,g,b;
};

int main() {
  // Initialize a framebuffer
  Pixel framebuffer[SIZE][SIZE];

  // Example: Generate a simple gradient
  for ( unsigned int x = 0; x < SIZE; ++x ) {
    for ( unsigned int y = 0; y < SIZE; ++y ) {
      framebuffer[x][y].r = x/2;
      framebuffer[x][y].g = y/2;
      framebuffer[x][y].b = 0;
    }
  }

  // Task1: Load RAW image file here instead
  // Task2: Apply a convolution filter to the loaded image
  // Task3: Merge multiple images using alpha blending
  // Task4: Draw lines and Bezier curves

  // Save the raw image to a file
  std::ofstream raw("result.rgb", std::ios::binary);
  raw.write((char*)framebuffer, sizeof(framebuffer));
  raw.close();
  
  // Helper object to save the framebuffer as TGA image
  TGAImage tga(SIZE, SIZE, 3, framebuffer);
  tga.write_tga_file("result.tga", true);

  return EXIT_SUCCESS;
}