source/graphics/glx/glcontext.cpp

   1 #include <set>
   2 #include <vector>
   3 #include <GL/glx.h>
   4 #include <GL/glxext.h>
   5 #include <msp/strings/utils.h>
   6 #include "glcontext.h"
   7 #include "display_private.h"
   8 #include "window_private.h"
   9
  10 using namespace std;
  11
  12 namespace Msp {
  13 namespace Graphics {
  14
  15 typedef GLXContext ContextHandle;
  16
  17 struct GLContext::Private
  18 {
  19         ContextHandle context;
  20         // We need to create a window with the chosen visual
  21         WindowHandle subwnd;
  22         GLXWindow glxwnd;
  23 };
  24
  25
  26 void GLContext::platform_init(const GLOptions &opts)
  27 {
  28         DisplayHandle dpy = display.get_private().display;
  29         int event_base;
  30         int error_base;
  31         if(!glXQueryExtension(dpy, &event_base, &error_base))
  32                 throw runtime_error("glX not found");
  33
  34         int major, minor;
  35         glXQueryVersion(dpy, &major, &minor);
  36
  37         set<string> extensions;
  38         if(major>1 || (major==1 && minor>=1))
  39         {
  40                 if(const char *ext_str = glXQueryExtensionsString(dpy, DefaultScreen(dpy)))
  41                 {
  42                         vector<string> exts = split(ext_str);
  43                         extensions.insert(exts.begin(), exts.end());
  44                 }
  45         }
  46
  47         if(major>1 || (major==1 && minor>=3))
  48         {
  49                 vector<int> fb_attribs;
  50
  51                 fb_attribs.push_back(GLX_DRAWABLE_TYPE);
  52                 fb_attribs.push_back(GLX_WINDOW_BIT);
  53
  54                 fb_attribs.push_back(GLX_RENDER_TYPE);
  55                 fb_attribs.push_back(GLX_RGBA_BIT);
  56
  57                 fb_attribs.push_back(GLX_DEPTH_SIZE);
  58                 fb_attribs.push_back(1);
  59
  60                 if(opts.alpha)
  61                 {
  62                         fb_attribs.push_back(GLX_ALPHA_SIZE);
  63                         fb_attribs.push_back(1);
  64                 }
  65
  66                 if(opts.stencil)
  67                 {
  68                         fb_attribs.push_back(GLX_STENCIL_SIZE);
  69                         fb_attribs.push_back(1);
  70                 }
  71
  72                 fb_attribs.push_back(GLX_DOUBLEBUFFER);
  73                 fb_attribs.push_back(opts.doublebuffer);
  74
  75                 if(opts.multisample>0)
  76                 {
  77                         fb_attribs.push_back(GLX_SAMPLE_BUFFERS_ARB);
  78                         fb_attribs.push_back(1);
  79                         fb_attribs.push_back(GLX_SAMPLES_ARB);
  80                         fb_attribs.push_back(opts.multisample);
  81                 }
  82
  83                 fb_attribs.push_back(0);
  84
  85                 int n_configs = 0;
  86                 GLXFBConfig *fb_configs = glXChooseFBConfig(dpy, DefaultScreen(dpy), &fb_attribs[0], &n_configs);
  87                 if(!fb_configs)
  88                         throw unsupported_gl_mode(opts);
  89
  90                 XVisualInfo *vi = glXGetVisualFromFBConfig(dpy, fb_configs[0]);
  91
  92                 XSetWindowAttributes attr;
  93                 attr.colormap = XCreateColormap(dpy, DefaultRootWindow(dpy), vi->visual, AllocNone);
  94
  95                 priv = new Private;
  96                 priv->subwnd = XCreateWindow(dpy, window.get_private().window, 0, 0, window.get_width(), window.get_height(), 0, vi->depth, InputOutput, vi->visual, CWColormap, &attr);
  97                 XMapWindow(dpy, priv->subwnd);
  98
  99                 priv->glxwnd = glXCreateWindow(dpy, fb_configs[0], priv->subwnd, 0);
 100
 101                 if(opts.forward_compatible || opts.gl_version_major)
 102                 {
 103                         if(!extensions.count("GLX_ARB_create_context") || !extensions.count("GLX_ARB_get_proc_address"))
 104                                 throw unsupported_gl_mode(opts);
 105
 106                         vector<int> ctx_attribs;
 107
 108                         ctx_attribs.push_back(GLX_RENDER_TYPE);
 109                         ctx_attribs.push_back(GLX_RGBA_TYPE);
 110
 111                         if(opts.forward_compatible)
 112                         {
 113                                 ctx_attribs.push_back(GLX_CONTEXT_FLAGS_ARB);
 114                                 ctx_attribs.push_back(GLX_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB);
 115                         }
 116
 117                         if(opts.gl_version_major)
 118                         {
 119                                 ctx_attribs.push_back(GLX_CONTEXT_MAJOR_VERSION_ARB);
 120                                 ctx_attribs.push_back(opts.gl_version_major);
 121                                 ctx_attribs.push_back(GLX_CONTEXT_MINOR_VERSION_ARB);
 122                                 ctx_attribs.push_back(opts.gl_version_minor);
 123                         }
 124
 125                         ctx_attribs.push_back(0);
 126
 127                         const GLubyte *name = reinterpret_cast<const GLubyte *>("glXCreateContextAttribsARB");
 128                         PFNGLXCREATECONTEXTATTRIBSARBPROC glXCreateContextAttribs = reinterpret_cast<PFNGLXCREATECONTEXTATTRIBSARBPROC>(glXGetProcAddressARB(name));
 129                         priv->context = glXCreateContextAttribs(dpy, fb_configs[0], 0, true, &ctx_attribs[0]);
 130                 }
 131                 else
 132                         priv->context = glXCreateNewContext(dpy, fb_configs[0], GLX_RGBA_TYPE, 0, true);
 133
 134                 XFree(vi);
 135                 XFree(fb_configs);
 136
 137                 glXMakeContextCurrent(dpy, priv->glxwnd, priv->glxwnd, priv->context);
 138         }
 139         else if(opts.forward_compatible || opts.gl_version_major)
 140                 throw unsupported_gl_mode(opts);
 141         else
 142         {
 143                 vector<int> attribs;
 144
 145                 attribs.push_back(GLX_RGBA);
 146                 attribs.push_back(GLX_DEPTH_SIZE);
 147                 attribs.push_back(1);
 148
 149                 if(opts.alpha)
 150                 {
 151                         attribs.push_back(GLX_ALPHA_SIZE);
 152                         attribs.push_back(1);
 153                 }
 154
 155                 if(opts.stencil)
 156                 {
 157                         attribs.push_back(GLX_STENCIL_SIZE);
 158                         attribs.push_back(1);
 159                 }
 160
 161                 if(opts.doublebuffer)
 162                         attribs.push_back(GLX_DOUBLEBUFFER);
 163
 164                 if(opts.multisample>0)
 165                 {
 166                         attribs.push_back(GLX_SAMPLE_BUFFERS_ARB);
 167                         attribs.push_back(1);
 168                         attribs.push_back(GLX_SAMPLES_ARB);
 169                         attribs.push_back(opts.multisample);
 170                 }
 171
 172                 attribs.push_back(0);
 173
 174                 XVisualInfo *vi = glXChooseVisual(dpy, DefaultScreen(dpy), &attribs.front());
 175                 if(!vi)
 176                         throw unsupported_gl_mode(opts);
 177
 178                 priv = new Private;
 179                 priv->glxwnd = 0;
 180                 priv->context = glXCreateContext(dpy, vi, 0, true);
 181
 182                 XSetWindowAttributes attr;
 183                 attr.colormap = XCreateColormap(dpy, DefaultRootWindow(dpy), vi->visual, AllocNone);
 184
 185                 priv->subwnd = XCreateWindow(dpy, window.get_private().window, 0, 0, window.get_width(), window.get_height(), 0, vi->depth, InputOutput, vi->visual, CWColormap, &attr);
 186                 XMapWindow(dpy, priv->subwnd);
 187
 188                 XFree(vi);
 189
 190                 glXMakeCurrent(dpy, priv->subwnd, priv->context);
 191         }
 192 }
 193
 194 GLContext::~GLContext()
 195 {
 196         DisplayHandle dpy = display.get_private().display;
 197
 198         if(priv->glxwnd)
 199         {
 200                 glXMakeContextCurrent(dpy, 0, 0, 0);
 201                 glXDestroyWindow(dpy, priv->glxwnd);
 202         }
 203         else
 204                 glXMakeCurrent(dpy, 0, 0);
 205         glXDestroyContext(dpy, priv->context);
 206         XDestroyWindow(dpy, priv->subwnd);
 207
 208         delete priv;
 209 }
 210
 211 void GLContext::set_swap_interval(unsigned i)
 212 {
 213         const GLubyte *name = reinterpret_cast<const GLubyte *>("glXSwapIntervalEXT");
 214         PFNGLXSWAPINTERVALEXTPROC glXSwapInterval = reinterpret_cast<PFNGLXSWAPINTERVALEXTPROC>(glXGetProcAddress(name));
 215         if(!glXSwapInterval)
 216                 throw runtime_error("glXSwapIntervalEXT not found");
 217         glXSwapInterval(display.get_private().display, (priv->glxwnd ? priv->glxwnd : priv->subwnd), i);
 218 }
 219
 220 void GLContext::swap_buffers()
 221 {
 222         glXSwapBuffers(display.get_private().display, (priv->glxwnd ? priv->glxwnd : priv->subwnd));
 223 }
 224
 225 void GLContext::window_resized(unsigned w, unsigned h)
 226 {
 227         XMoveResizeWindow(display.get_private().display, priv->subwnd, 0, 0, w, h);
 228 }
 229
 230 } // namespace Graphics
 231 } // namespace Msp