Simple BRender Program for Newbies

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/*
 * Copyright (c) 1995/1996 Argonaut Technologies Limited. All rights reserved.
 * BRender v1.2.1 Program to Display a Revolving Illuminated Cube.
 */

#include <stddef.h>
#include <stdio.h>

#include "brender.h"
#include "dosio.h"

int main( )
{
  /*
  ** Need screen and back buffers for double-buffering,
  ** a Z-Buffer to store current depth information, and a storage
  ** buffer for the currently loaded palette
   */

  br_pixelmap *screen_buffer, *back_buffer, *depth_buffer, *palette;

  /* The actors in the world : Need a root actor, a camera actor, and a
  ** model actor
   */

  br_actor *world, *observer, *cube, *light;

  int i;                                       /*counter*/

/************* Initialise Renderer and Set Screen Resolution ***************/
  BrBegin();

  /*Initialise screen buffer*/
  /* Set up Colour Look Up Table ( CLUT ) (ignored in true-colour)*/

  screen_buffer = DOSGfxBegin("MCGA");
  palette = BrPixelmapLoad("std.pal");
  if(palette)
    DOSGfxPaletteSet(palette);

  /*Initialise Z-Buffer renderer*/
  BrZbBegin(screen_buffer->type,BR_PMT_DEPTH_16);


  /* Allocate back buffer and depth buffer*/
  back_buffer = BrPixelmapMatch(screen_buffer,BR_PMMATCH_OFFSCREEN);
  back_buffer->origin_x = back_buffer->width12;
  back_buffer->origin_y = back_buffer->height12;

  depth_buffer = BrPixelmapMatch(screen_buffer,BR_PMMATCH_DEPTH_16);

  /************************* Build the World Database ************************/
  /*Start with None actor at root of actor tree and call it 'world'*/
  world = BrActorAllocate(BR_ACTOR_NONE,NULL);

  /* Add a camera actor as a child of 'world'*/
  observer = BrActorAdd(world,BrActorAllocate(BR_ACTOR_CAMERA,NULL));

  /*Add, and enable, the default light source*/
  light = (BrActorAdd(world,BrActorAllocate(BR_ACTOR_LIGHT,NULL)));
  BrLightEnable(light);

  /* Move camera position 5 units along +z axis so model becomes visible*/
  observer->t.type = BR_TRANSFORM_MATRIX34;
  BrMatrix34Translate(&observer->t.t.mat,
	BR_SCALAR(0.0), BR_SCALAR(0.0), BR_SCALAR(5.0));

  /*Add a model actor : The default cube*/
  cube = BrActorAdd(world,BrActorAllocate(BR_ACTOR_MODEL,NULL));

  /*Rotate cube to enhance visiblilty*/
  cube->t.type = BR_TRANSFORM_MATRIX34;
  BrMatrix34RotateY(&cube->t.t.mat,BR_ANGLE_DEG(30));

  /********************************* Animation Loop **************************/

  /* Rotate cube around the x-axis */
  for(i=0; I<360; i++)
  {

    /* initialise depth buffer and set background colour to black*/
    brpixelmapfill(back_buffer,0);
    brpixelmapfill(depth_buffer,0xffffffff);

    /* render scene */
    brzbscenerender(world,observer,back_buffer,depth_buffer);
    brpixelmapdoublebuffer(screen_buffer,back_buffer);

    /* rotate cube */
    brmatrix34postrotatex(&cube->t.t.mat,BR_ANGLE_DEG(2.0));

  }

  /* Close down */
  BrPixelmapFree(depth_buffer);
  BrPixelmapFree(back_buffer);
  BrZbEnd();
  DOSGfxEnd();
  BrEnd();

  return 0;
}

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