src/add-ons/screen_savers/gravity/GravityView.cpp

   1 /*
   2  * Copyright 2012-2013 Tri-Edge AI <triedgeai@gmail.com>
   3  * Copyright 2014 Haiku, Inc. All rights reserved.
   4  *
   5  * Distributed under the terms of the MIT license.
   6  *
   7  * Authors:
   8  *              Tri-Edge AI
   9  *              John Scipione, jscipione@gmail.com
  10  */
  11
  12
  13 #include "GravityView.h"
  14
  15 #include "Gravity.h"
  16 #include "GravitySource.h"
  17 #include "Particle.h"
  18
  19 #include <GL/glu.h>
  20
  21
  22 GravityView::GravityView(BRect frame, Gravity* parent)
  23         :
  24         BGLView(frame, B_EMPTY_STRING, B_FOLLOW_NONE, 0,
  25                 BGL_RGB | BGL_DEPTH | BGL_DOUBLE),
  26         fParent(parent),
  27         fGravitySource(new GravitySource()),
  28         fSize(128 << parent->Config.ParticleCount),
  29         fShade(parent->Config.ShadeID)
  30 {
  31         Particle::Initialize(fSize, fShade);
  32 }
  33
  34
  35 GravityView::~GravityView()
  36 {
  37         Particle::Terminate();
  38         delete fGravitySource;
  39 }
  40
  41
  42 void
  43 GravityView::AttachedToWindow()
  44 {
  45         LockGL();
  46         BGLView::AttachedToWindow();
  47
  48         glClearDepth(1.0f);
  49
  50         glEnable(GL_BLEND);
  51         glBlendFunc(GL_SRC_ALPHA, GL_ONE);
  52
  53         glMatrixMode(GL_PROJECTION);
  54         glLoadIdentity();
  55         gluPerspective(45.0f, Bounds().Width() / Bounds().Height(), 2.0f, 20000.0f);
  56         glMatrixMode(GL_MODELVIEW);
  57         glLoadIdentity();
  58
  59         glTranslatef(0.0f, 0.0f, -30.0f);
  60
  61         glDepthMask(GL_FALSE);
  62
  63         UnlockGL();
  64 }
  65
  66
  67 void
  68 GravityView::DirectDraw()
  69 {
  70         int32 size = 128 << fParent->Config.ParticleCount;
  71         int32 shade = fParent->Config.ShadeID;
  72
  73         // resize particle list if needed
  74         if (size > fSize)
  75                 Particle::AddParticles(size, shade);
  76         else if (size < fSize)
  77                 Particle::RemoveParticles(size, shade);
  78
  79         // recolor particles if needed
  80         if (shade != fShade)
  81                 Particle::ColorParticles(size, shade);
  82
  83         fSize = size;
  84         fShade = shade;
  85
  86         LockGL();
  87
  88         glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
  89         glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
  90
  91         Particle::Tick();
  92         fGravitySource->Tick();
  93
  94         SwapBuffers();
  95
  96         UnlockGL();
  97 }
  98