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nux  3.0.0
framebufferobject.cpp
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00001 /*
00002  * Copyright 2010 Inalogic Inc.
00003  *
00004  * This program is free software: you can redistribute it and/or modify it
00005  * under the terms of the GNU General Public License version 3, as published
00006  * by the  Free Software Foundation.
00007  *
00008  * This program is distributed in the hope that it will be useful, but
00009  * WITHOUT ANY WARRANTY; without even the implied warranties of
00010  * MERCHANTABILITY, SATISFACTORY QUALITY or FITNESS FOR A PARTICULAR
00011  * PURPOSE.  See the GNU General Public License for more details.
00012  *
00013  * You should have received a copy of the GNU General Public License
00014  * version 3 along with this program.  If not, see
00015  * <http://www.gnu.org/licenses/>
00016  *
00017  * Authored by: Jay Taoko <jaytaoko@inalogic.com>
00018  *
00019  */
00020 
00021 
00022 #include "NuxCore/NuxCore.h"
00023 #include "NuxGraphics/BitmapFormats.h"
00024 #include "NuxGraphics/GraphicsDisplay.h"
00025 #include "NuxGraphics/GLWindowManager.h"
00026 #include "NuxGraphics/GraphicsEngine.h"
00027 
00028 /*
00029  * Tests: 
00030  *  - frame buffer object
00031  *  - Set a texture in the fbo
00032  *  - Set fbo as a render target
00033  *  - Render Quad to fbo
00034  *  - Use fbo texture to draw a full screen quad on the default render target
00035  */
00036  
00037 void RenderToFrameBufferObject ()
00038 {
00039   nux::GraphicsDisplay* graphics_display = gGLWindowManager.CreateGLWindow("Window", 570, 270, nux::WINDOWSTYLE_NORMAL, 0, false);
00040   nux::GraphicsEngine* graphics_engine = graphics_display->GetGraphicsEngine();
00041 
00042   graphics_display->ShowWindow();
00043 
00044   nux::ObjectPtr<nux::IOpenGLFrameBufferObject> fbo;
00045   nux::ObjectPtr<nux::IOpenGLBaseTexture> texture_rt;
00046   nux::ObjectPtr<nux::IOpenGLBaseTexture> depth_rt;
00047 
00048   fbo         = graphics_display->GetGpuDevice ()->CreateFrameBufferObject ();
00049   texture_rt  = graphics_display->GetGpuDevice ()->CreateSystemCapableDeviceTexture (graphics_display->GetWindowWidth(), graphics_display->GetWindowHeight(), 1, nux::BITFMT_R8G8B8A8);
00050   depth_rt    = graphics_display->GetGpuDevice ()->CreateSystemCapableDeviceTexture (graphics_display->GetWindowWidth(), graphics_display->GetWindowHeight(), 1, nux::BITFMT_D24S8);
00051 
00052 
00053   int w, h;
00054   graphics_engine->GetWindowSize(w, h);
00055   graphics_engine->SetViewport(0, 0, w, h);
00056   graphics_engine->SetContext(0, 0, w, h);
00057   graphics_engine->Push2DWindow(w, h);
00058 
00059   nux::Event event;
00060   memset(&event, 0, sizeof(nux::Event));
00061 
00062   do
00063   {
00064     CHECKGL( glClearColor(0, 0, 0, 1) );
00065     CHECKGL( glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT|GL_STENCIL_BUFFER_BIT) );
00066 
00067     graphics_display->GetSystemEvent(&event);
00068     if(event.type == nux::NUX_SIZE_CONFIGURATION)
00069     {
00070       graphics_engine->DisableAllTextureMode(0);
00071       graphics_engine->DisableAllTextureMode(1);
00072       graphics_engine->DisableAllTextureMode(2);
00073       graphics_engine->DisableAllTextureMode(3);
00074       graphics_engine->GetWindowSize(w, h);
00075       graphics_engine->SetViewport(0, 0, w, h);
00076       graphics_engine->SetScissor(0, 0, w, h);
00077       graphics_engine->SetContext(0, 0, w, h);
00078       graphics_engine->Push2DWindow(w, h);
00079 
00080       fbo         = graphics_display->GetGpuDevice ()->CreateFrameBufferObject ();
00081       texture_rt  = graphics_display->GetGpuDevice ()->CreateSystemCapableDeviceTexture (graphics_display->GetWindowWidth(), graphics_display->GetWindowHeight(), 1, nux::BITFMT_R8G8B8A8);
00082       depth_rt    = graphics_display->GetGpuDevice ()->CreateSystemCapableDeviceTexture (graphics_display->GetWindowWidth(), graphics_display->GetWindowHeight(), 1, nux::BITFMT_D24S8);
00083     }
00084 
00085     fbo->FormatFrameBufferObject (graphics_display->GetWindowWidth(), graphics_display->GetWindowHeight(), nux::BITFMT_R8G8B8A8);
00086     fbo->SetRenderTarget (0, texture_rt->GetSurfaceLevel (0));
00087     fbo->SetDepthSurface (depth_rt->GetSurfaceLevel (0));
00088     fbo->Activate();
00089 
00090     graphics_engine->GetWindowSize(w, h);
00091     graphics_engine->SetViewport(0, 0, w, h);
00092     graphics_engine->SetContext(0, 0, w, h);
00093     graphics_engine->Push2DWindow(w, h);
00094 
00095     nux::Rect geo (nux::RandomUInt(graphics_display->GetWindowWidth()),
00096       nux::RandomUInt(graphics_display->GetWindowHeight()),
00097       nux::RandomUInt(200),
00098       nux::RandomUInt(200));
00099 
00100     graphics_engine->QRP_Color(geo.x, geo.y, geo.width, geo.height, nux::color::RandomColor());
00101 
00102     graphics_display->GetGpuDevice ()->DeactivateFrameBuffer ();
00103 
00104     nux::TexCoordXForm texxform;
00105     graphics_engine->QRP_1Tex(0, 0, graphics_display->GetWindowWidth(), graphics_display->GetWindowHeight(), texture_rt, texxform, nux::color::White);
00106 
00107     graphics_display->SwapBuffer();
00108   } while(event.type != nux::NUX_TERMINATE_APP);
00109 
00110   fbo.Release ();
00111   texture_rt.Release ();
00112   depth_rt.Release ();
00113 
00114   delete graphics_display;
00115 }
00116 
00117 int main(int argc, char **argv)
00118 {
00119   nux::NuxCoreInitialize(0);
00120   nux::NuxGraphicsInitialize();
00121 
00122   RenderToFrameBufferObject ();
00123 
00124   return 0;
00125 }
00126