Consistently label the graphics part as graphics

[libs/gui.git] / source / graphics / glcontext.cpp

diff --git a/source/graphics/glcontext.cpp b/source/graphics/glcontext.cpp
new file mode 100644 (file)
index 0000000..b713830
--- /dev/null
+++ b/source/graphics/glcontext.cpp
@@ -0,0 +1,187 @@
+#include <vector>
+#ifdef WIN32
+#include <windows.h>
+#endif
+#ifdef WITH_OPENGL
+#include <GL/gl.h>
+#ifndef WIN32
+#include <GL/glx.h>
+#endif
+#endif
+#include <msp/core/application.h>
+#include <msp/strings/format.h>
+#include "display.h"
+#include "glcontext.h"
+#include "window.h"
+#include "display_priv.h"
+
+namespace Msp {
+namespace Graphics {
+
+GLOptions::GLOptions():
+       alpha(false),
+       stencil(false),
+       doublebuffer(true),
+       multisample(0)
+{ }
+
+
+unsupported_gl_mode::unsupported_gl_mode(const GLOptions &opts):
+       runtime_error(format("{ .alpha=%s, .stencil=%s, .doublebuffer=%s, .multisample=%d }",
+               opts.alpha, opts.stencil, opts.doublebuffer, opts.multisample))
+{ }
+
+
+#ifdef WITH_OPENGL
+#ifdef WIN32
+typedef HGLRC Context;
+#else
+typedef GLXContext Context;
+#endif
+
+struct GLContext::Private
+{
+       Context context;
+#ifndef WIN32
+       // In X11, we need to create a window with the chosen visual
+       WindowHandle subwnd;
+#endif
+};
+#endif
+
+
+GLContext::GLContext(Window &wnd, const GLOptions &opts):
+       display(wnd.get_display()),
+       window(wnd)
+{
+#ifdef WITH_OPENGL
+       priv = new Private;
+
+#ifdef WIN32
+       HDC dc = GetDC(window.get_private().window);
+
+       PIXELFORMATDESCRIPTOR pfd;
+       memset(&pfd, 0, sizeof(pfd));
+
+       pfd.nSize = sizeof(pfd);
+       pfd.nVersion = 1;
+       pfd.dwFlags = PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL;
+       if(opts.doublebuffer)
+               pfd.dwFlags |= PFD_DOUBLEBUFFER;
+       pfd.iPixelType = PFD_TYPE_RGBA;
+       if(opts.alpha)
+               pfd.cAlphaBits = 1;
+       pfd.cDepthBits = 1;
+       if(opts.stencil)
+               pfd.cStencilBits = 1;
+
+       int pf_index = ChoosePixelFormat(dc, &pfd);
+       if(!pf_index)
+               throw unsupported_gl_mode(opts);
+       SetPixelFormat(dc, pf_index, &pfd);
+
+       priv->context = wglCreateContext(dc);
+       wglMakeCurrent(dc, priv->context);
+
+       ReleaseDC(window.get_private().window, dc);
+#else
+       std::vector<int> attribs;
+       
+       attribs.push_back(GLX_RGBA);
+       attribs.push_back(GLX_DEPTH_SIZE);
+       attribs.push_back(1);
+       
+       if(opts.alpha)
+       {
+               attribs.push_back(GLX_ALPHA_SIZE);
+               attribs.push_back(1);
+       }
+       
+       if(opts.stencil)
+       {
+               attribs.push_back(GLX_STENCIL_SIZE);
+               attribs.push_back(1);
+       }
+       
+       if(opts.doublebuffer)
+               attribs.push_back(GLX_DOUBLEBUFFER);
+       
+       if(opts.multisample>0)
+       {
+               attribs.push_back(GLX_SAMPLE_BUFFERS_ARB);
+               attribs.push_back(opts.multisample);
+       }
+       
+       attribs.push_back(0);
+
+       ::Display *dpy = display.get_private().display;
+
+       XVisualInfo *vi = glXChooseVisual(dpy, DefaultScreen(dpy), &attribs.front());
+       if(!vi)
+               throw unsupported_gl_mode(opts);
+       priv->context = glXCreateContext(dpy, vi, 0, true);
+
+       XSetWindowAttributes attr;
+       attr.colormap = XCreateColormap(dpy, DefaultRootWindow(dpy), vi->visual, AllocNone);
+
+       priv->subwnd = XCreateWindow(dpy, window.get_private().window, 0, 0, window.get_width(), window.get_height(), 0, vi->depth, InputOutput, vi->visual, CWColormap, &attr);
+       XMapWindow(dpy, priv->subwnd);
+
+       XFree(vi);
+
+       glXMakeCurrent(dpy, priv->subwnd, priv->context);
+#endif
+#else
+       (void)wnd;
+       (void)opts;
+       throw runtime_error("no OpenGL support");
+#endif
+
+       window.signal_resize.connect(sigc::mem_fun(this, &GLContext::window_resized));
+}
+
+GLContext::~GLContext()
+{
+#ifdef WITH_OPENGL
+#ifdef WIN32
+       wglMakeCurrent(0, 0);
+       wglDeleteContext(priv->context);
+#else
+       ::Display *dpy = display.get_private().display;
+
+       glXMakeCurrent(dpy, 0, 0);
+       glXDestroyContext(dpy, priv->context);
+       XDestroyWindow(dpy, priv->subwnd);
+#endif
+       delete priv;
+#endif
+}
+
+void GLContext::swap_buffers()
+{
+#ifdef WITH_OPENGL
+#ifdef WIN32
+       HDC dc = GetDC(window.get_private().window);
+       SwapBuffers(dc);
+       ReleaseDC(window.get_private().window, dc);
+#else
+       glXSwapBuffers(display.get_private().display, priv->subwnd);
+#endif
+#endif
+}
+
+void GLContext::window_resized(unsigned w, unsigned h)
+{
+#ifdef WITH_OPENGL
+#ifndef WIN32
+       XMoveResizeWindow(display.get_private().display, priv->subwnd, 0, 0, w, h);
+#endif
+       glViewport(0, 0, w, h);
+#else
+       (void)w;
+       (void)h;
+#endif
+}
+
+} // namespace Graphics
+} // namespace Msp