HGLRC CL_GL1CreationHelper::create_opengl3_context(HGLRC share_context, int major_version, int minor_version)
{
set_active();
ptr_wglCreateContextAttribsARB wglCreateContextAttribsARB = (ptr_wglCreateContextAttribsARB) wglGetProcAddress("wglCreateContextAttribsARB");
reset_active();
HGLRC opengl3_context = 0;
if (wglCreateContextAttribsARB)
{
std::vector<int> int_attributes;
int_attributes.push_back(WGL_CONTEXT_MAJOR_VERSION_ARB);
int_attributes.push_back(major_version);
int_attributes.push_back(WGL_CONTEXT_MINOR_VERSION_ARB);
int_attributes.push_back(minor_version);
//int_attributes.push_back(WGL_CONTEXT_LAYER_PLANE_ARB);
//int_attributes.push_back(layer_plane);
//int_attributes.push_back(WGL_CONTEXT_FLAGS_ARB);
//int_attributes.push_back(flags);
//int_attributes.push_back(WGL_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB);
//int_attributes.push_back(forward_compatible_bit);
int_attributes.push_back(0);
opengl3_context = wglCreateContextAttribsARB(hdc, share_context, &int_attributes[0]);
}
return opengl3_context;
}
HGLRC OpenGLCreationHelper::create_opengl3_context(HGLRC share_context, int major_version, int minor_version, const OpenGLContextDescription &gldesc)
{
set_active();
ptr_wglCreateContextAttribsARB wglCreateContextAttribsARB = (ptr_wglCreateContextAttribsARB)wglGetProcAddress("wglCreateContextAttribsARB");
HGLRC opengl3_context = 0;
if (wglCreateContextAttribsARB)
{
std::vector<int> int_attributes;
int_attributes.push_back(WGL_CONTEXT_MAJOR_VERSION_ARB);
int_attributes.push_back(major_version);
int_attributes.push_back(WGL_CONTEXT_MINOR_VERSION_ARB);
int_attributes.push_back(minor_version);
int_attributes.push_back(0x2093); // WGL_CONTEXT_LAYER_PLANE_ARB
int_attributes.push_back(gldesc.get_layer_plane());
int_attributes.push_back(0x2094); // WGL_CONTEXT_FLAGS_ARB
int flags = 0;
if (gldesc.get_debug())
flags |= 0x1; // WGL_CONTEXT_DEBUG_BIT_ARB
if (gldesc.get_forward_compatible()) // WGL_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB
flags |= 0x2;
int_attributes.push_back(flags);
int_attributes.push_back(0x9126); // WGL_CONTEXT_PROFILE_MASK_ARB
flags = 0;
if (gldesc.get_core_profile())
flags |= 0x1; // WGL_CONTEXT_CORE_PROFILE_BIT_ARB
if (gldesc.get_compatibility_profile()) // WGL_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB
flags |= 0x2;
int_attributes.push_back(flags);
int_attributes.push_back(0);
opengl3_context = wglCreateContextAttribsARB(hdc, share_context, &int_attributes[0]);
}
reset_active();
return opengl3_context;
}
void CL_GL1CreationHelper::set_multisampling_pixel_format(const CL_GL1WindowDescription &gldesc)
{
PIXELFORMATDESCRIPTOR pfd;
memset(&pfd, 0, sizeof(PIXELFORMATDESCRIPTOR));
pfd.nSize = sizeof(PIXELFORMATDESCRIPTOR);
pfd.nVersion = 1;
pfd.dwFlags = PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL;
pfd.iPixelType = PFD_TYPE_RGBA;
if (gldesc.get_doublebuffer()) pfd.dwFlags |= PFD_DOUBLEBUFFER;
if (gldesc.get_stereo()) pfd.dwFlags |= PFD_STEREO;
pfd.cColorBits = gldesc.get_buffer_size();
pfd.cRedBits = gldesc.get_red_size();
pfd.cGreenBits = gldesc.get_green_size();
pfd.cBlueBits = gldesc.get_blue_size();
pfd.cAlphaBits = gldesc.get_alpha_size();
pfd.cDepthBits = gldesc.get_depth_size();
pfd.cStencilBits = gldesc.get_stencil_size();
if (gldesc.is_layered())
{
pfd.cAlphaBits = 8;
pfd.dwFlags |= PFD_DOUBLEBUFFER_DONTCARE; // | PFD_DRAW_TO_BITMAP
}
if (gldesc.get_multisampling() < 1)
{
int pixelformat = ChoosePixelFormat(hdc, &pfd);
SetPixelFormat(hdc, pixelformat, &pfd);
}
else
{
int pixelformat = ChoosePixelFormat(hdc, &pfd);
set_active();
ptr_wglChoosePixelFormatEXT wglChoosePixelFormatEXT = (ptr_wglChoosePixelFormatEXT) wglGetProcAddress("wglChoosePixelFormatEXT");
if (wglChoosePixelFormatEXT == 0)
wglChoosePixelFormatEXT = (ptr_wglChoosePixelFormatEXT) wglGetProcAddress("wglChoosePixelFormatARB");
reset_active();
if (wglChoosePixelFormatEXT)
{
std::vector<FLOAT> float_attributes;
std::vector<int> int_attributes;
int_attributes.push_back(WGL_DRAW_TO_WINDOW);
int_attributes.push_back(GL_TRUE);
int_attributes.push_back(WGL_ACCELERATION);
int_attributes.push_back(WGL_FULL_ACCELERATION);
if (gldesc.get_doublebuffer())
{
int_attributes.push_back(WGL_DOUBLE_BUFFER);
int_attributes.push_back(GL_TRUE);
}
if (gldesc.get_stereo())
{
int_attributes.push_back(WGL_STEREO);
int_attributes.push_back(GL_TRUE);
}
int_attributes.push_back(WGL_COLOR_BITS);
int_attributes.push_back(gldesc.get_red_size() + gldesc.get_green_size() + gldesc.get_blue_size());
int_attributes.push_back(WGL_ALPHA_BITS);
int_attributes.push_back(gldesc.get_alpha_size());
int_attributes.push_back(WGL_DEPTH_BITS);
int_attributes.push_back(gldesc.get_depth_size());
int_attributes.push_back(WGL_STENCIL_BITS);
int_attributes.push_back(gldesc.get_stencil_size());
int_attributes.push_back(WGL_SAMPLE_BUFFERS);
int_attributes.push_back(GL_TRUE);
int_attributes.push_back(WGL_SAMPLES);
int_attributes.push_back(gldesc.get_multisampling());
float_attributes.push_back(0.0f);
float_attributes.push_back(0.0f);
int_attributes.push_back(0);
int_attributes.push_back(0);
int new_pixelformat = pixelformat;
UINT num_formats = 0;
BOOL result = wglChoosePixelFormatEXT(hdc, &int_attributes[0], &float_attributes[0], 1, &new_pixelformat, &num_formats);
if (result == TRUE && num_formats > 0)
pixelformat = new_pixelformat;
}
SetPixelFormat(hdc, pixelformat, &pfd);
}
}
