src/libprojectM/Renderer/VideoEcho.cpp

/*
 * VideoEcho.cpp
 *
 *  Created on: Jun 29, 2008
 *      Author: pete
 */
#include "Common.hpp"

#ifdef USE_GLES1
#include <GLES/gl.h>
#else
#ifdef __APPLE__
#include <OpenGL/gl.h>
#include <OpenGL/glu.h>
#else
#include <GL/gl.h>
#include <GL/glu.h>
#endif
#endif

#include "VideoEcho.hpp"


VideoEcho::VideoEcho(): a(0), zoom(1), orientation(Normal)
{
  // TODO Auto-generated constructor stub

}

VideoEcho::~VideoEcho()
{
  // TODO Auto-generated destructor stub
}

void
VideoEcho::Draw(RenderContext &context)
{
  glEnable(GL_TEXTURE_2D);

  float tex[4][2] = {{0, 1},
                     {0, 0},
                     {1, 0},
                     {1, 1}};

  float points[4][2] = {{-0.5, -0.5},
                        {-0.5,  0.5},
                        { 0.5,  0.5},
                        { 0.5,  -0.5}};

  glEnableClientState(GL_VERTEX_ARRAY);
  glDisableClientState(GL_COLOR_ARRAY);
  glEnableClientState(GL_TEXTURE_COORD_ARRAY);

  glVertexPointer(2,GL_FLOAT,0,points);
  glTexCoordPointer(2,GL_FLOAT,0,tex);

  //Now Blend the Video Echo
  glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);

  glMatrixMode(GL_TEXTURE);

  //draw video echo
  glColor4f(1.0, 1.0, 1.0, a * masterAlpha);
  glTranslatef(.5, .5, 0);
  glScalef(1.0/zoom, 1.0/zoom, 1);
  glTranslatef(-.5, -.5, 0);

  int flipx=1, flipy=1;
  switch (orientation)
  {
  case Normal:  flipx =  1;  flipy =  1;  break;
  case FlipX:   flipx = -1;  flipy =  1;  break;
  case FlipY:   flipx =  1;  flipy = -1;  break;
  case FlipXY:  flipx = -1;  flipy = -1;  break;
  default:      flipx =  1;  flipy =  1;  break;
  }

  float pointsFlip[4][2] = {{-0.5*flipx, -0.5*flipy},
                            {-0.5*flipx,  0.5*flipy},
                            { 0.5*flipx,  0.5*flipy},
                            { 0.5*flipx, -0.5*flipy}};

  glVertexPointer(2,GL_FLOAT,0,pointsFlip);
  glDrawArrays(GL_TRIANGLE_FAN,0,4);

  glDisable(GL_TEXTURE_2D);
  glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);

  glDisableClientState(GL_TEXTURE_COORD_ARRAY);
}