Rasterizer.cpp

#ifdef _WIN32
  #include <windows.h>
#endif

#include <iostream>
#include <math.h>
#include <GL/gl.h>
#include <GL/glut.h>

static int window_width = 512, window_height = 512;
static float* pixels = new float[window_width * window_height * 3];

using namespace std;

struct Color    // generic color
{
  float r,g,b;
};

void loadData()
{
  // put code to load data model here
}

// Clear frame buffer
void clearBuffer()
{
  Color clearColor = {0.0, 0.0, 0.0};   // clear color: black
  for (int i=0; i<window_width*window_height; ++i)
  {
    pixels[i*3]   = clearColor.r;
    pixels[i*3+1] = clearColor.g;
    pixels[i*3+2] = clearColor.b;
  }  
}

// Draw a point into the frame buffer
void drawPoint(int x, int y, float r, float g, float b)
{
  int offset = y*window_width*3 + x*3;
  pixels[offset]   = r;
  pixels[offset+1] = g;
  pixels[offset+2] = b;
}

void rasterizeTriangle()
{
  // Add code to rasterize a triangle
}

void rasterize()
{
  // Put your main rasterization loop here
  // It should go over the data model and call rasterizeTriangle for every triangle in it
  
  // example: draw diagonal line:
  for (int i=0; i<min(window_width,window_height); ++i)
  {
    drawPoint(i, i, 1.0, 0.0, 0.0);
  }
}

// Called whenever the window size changes
void reshape(int new_width, int new_height)
{
  window_width  = new_width;
  window_height = new_height;
  delete[] pixels;
  pixels = new float[window_width * window_height * 3];
}

void keyboard(unsigned char key, int, int)
{
  cerr << "Key pressed: " << key << endl;
}

void display()
{
  clearBuffer();
  rasterize();

  glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

  // glDrawPixels writes a block of pixels to the framebuffer
  glDrawPixels(window_width, window_height, GL_RGB, GL_FLOAT, pixels);

  glutSwapBuffers();
}

int main(int argc, char** argv) {
  glutInit(&argc, argv);

  glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);
  glutInitWindowSize(window_width, window_height);
  glutCreateWindow("CSE 167 Project 3");

  loadData();

  glutReshapeFunc(reshape);
  glutDisplayFunc(display);
  glutKeyboardFunc(keyboard);
  glEnable(GL_DEPTH_TEST);
  glClearColor(0.0, 0.0, 0.0, 1.0);
  glutMainLoop();
}