source: trunk/src/gl/gl_window.cc @ 505

// Copyright (C) 2012-2015 ChaosForge Ltd
// http://chaosforge.org/
//
// This file is part of Nova libraries. 
// For conditions of distribution and use, see copying.txt file in root folder.

#include "nv/gl/gl_window.hh"

#include "nv/core/logging.hh"
#include "nv/lib/gl.hh"
#include "nv/lib/sdl.hh"

using namespace nv;

void gl_window::swap_buffers()
{
#if NV_PLATFORM == NV_WINDOWS
                ::SwapBuffers( reinterpret_cast<HDC>( m_hwnd ) );
#else
        NV_ASSERT( false, "Native GL context currently only working on Windows!" );
#endif
}

gl_window::~gl_window()
{
        if ( m_context )
        {
#if NV_PLATFORM == NV_WINDOWS
                        dynwglDeleteContext( reinterpret_cast<HGLRC>( m_context->get_native_handle() ) );
#endif
        }
        delete m_context;
        m_context = nullptr;
}

nv::gl_window::gl_window( device* dev, window_manager* wm, input* a_input, void* handle, void* dc )
        : m_device( dev ), m_width( 0 ), m_height( 0 ), m_handle( nullptr )
{
#if NV_PLATFORM == NV_WINDOWS
        m_input = a_input;

        m_handle = handle;
        m_dc     = dc;

        // TODO: error checking
        HDC hdc = reinterpret_cast<HDC>( dc );

        const int wgl_attrib_list[] =
        {
                WGL_DRAW_TO_WINDOW_ARB, GL_TRUE,
                WGL_SUPPORT_OPENGL_ARB, GL_TRUE,
                WGL_ACCELERATION_ARB,   WGL_FULL_ACCELERATION_ARB,
                WGL_DOUBLE_BUFFER_ARB,  GL_TRUE,
                WGL_PIXEL_TYPE_ARB,     WGL_TYPE_RGBA_ARB,
                WGL_COLOR_BITS_ARB,     32,
                WGL_DEPTH_BITS_ARB,     24,
                WGL_STENCIL_BITS_ARB,   8,
                0, 0  //End
        };

        unsigned int num_formats;
        int pixel_format;
        PIXELFORMATDESCRIPTOR pfd;

        if ( FALSE == wglChoosePixelFormatARB(hdc, wgl_attrib_list, NULL, 1, &pixel_format, &num_formats) )
        {
                return;
        }

        if ( FALSE == SetPixelFormat(hdc, pixel_format, &pfd) )
        {
                //int err = GetLastError();
                return;
        }

        int attribs[] =
        {
                WGL_CONTEXT_MAJOR_VERSION_ARB,   3,
                WGL_CONTEXT_MINOR_VERSION_ARB,   1,
                WGL_CONTEXT_PROFILE_MASK_ARB,  WGL_CONTEXT_CORE_PROFILE_BIT_ARB, 
                //WGL_CONTEXT_PROFILE_MASK_ARB, WGL_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB,
                0, 0  //End
        };

        HGLRC ctx_handle;
        if ( 0 == (ctx_handle = wglCreateContextAttribsARB(hdc, 0, attribs) ) )
        {
                return;
        }

        if ( FALSE == dynwglMakeCurrent( hdc, ctx_handle ) )
        {
                return;
        }     

        load_gl_library( NV_GL_PATH, true );
        load_wgl_library( NV_GL_PATH, true );

        m_context = new gl_context( m_device, ctx_handle );
        // Doesn't work :/
//      RECT rect;
//      GetClientRect( (HWND)handle, &rect );
//      m_width   = (uint16)rect.right;
//      m_height  = (uint16)rect.bottom;
        m_handle  = wm->adopt_window( handle );
        m_hwnd    = ::GetDC( reinterpret_cast<HWND>( handle ) );
        m_context->set_viewport( nv::ivec4( 0, 0, 1, 1 ) );
#else
        NV_ASSERT( false, "Native GL context adoption not implemented for this platform!" );
#endif
}

void nv::gl_window::make_current()
{
#if NV_PLATFORM == NV_WINDOWS
        HDC hdc = reinterpret_cast<HDC>( m_hwnd );
        dynwglMakeCurrent( hdc, reinterpret_cast<HGLRC>( m_context->get_native_handle() ) );
#endif
}

nv::uint32 nv::gl_window::window_id()
{
        return SDL_GetWindowID( static_cast<SDL_Window*>( m_handle ) );
}