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/*!
\file lib/nviz/render.c
\brief Nviz library -- GLX context manipulation
Based on visualization/nviz/src/togl.c
(C) 2008, 2010 by the GRASS Development Team
This program is free software under the GNU General Public License
(>=v2). Read the file COPYING that comes with GRASS for details.
\author Updated/modified by Martin Landa <landa.martin gmail.com> (Google SoC 2008/2010)
*/
#include <grass/glocale.h>
#include <grass/nviz.h>
/*!
\brief Allocate memory for render window
\return pointer to render_window struct
\return NULL on failure
*/
struct render_window *Nviz_new_render_window(void)
{
struct render_window *rwin;
/* G_malloc() calls G_fatal_error() on failure */
rwin = (struct render_window *)G_malloc(sizeof(struct render_window));
return rwin;
}
/*!
\brief Initialize render window
\param win pointer to render_window struct
*/
void Nviz_init_render_window(struct render_window *rwin)
{
#if defined(OPENGL_X11)
rwin->displayId = NULL;
rwin->contextId = NULL;
rwin->pixmap = 0;
rwin->windowId = 0;
#elif defined(OPENGL_AQUA)
rwin->pixelFmtId = NULL;
rwin->contextId = NULL;
rwin->windowId = NULL;
#elif defined(OPENGL_WINDOWS)
rwin->displayId = NULL;
rwin->contextId = NULL;
rwin->bitmapId = NULL;
#endif
}
/*!
\brief Free render window
\param win pointer to render_window struct
*/
void Nviz_destroy_render_window(struct render_window *rwin)
{
#if defined(OPENGL_X11)
glXDestroyGLXPixmap(rwin->displayId, rwin->windowId);
XFreePixmap(rwin->displayId, rwin->pixmap);
glXDestroyContext(rwin->displayId, rwin->contextId);
XCloseDisplay(rwin->displayId);
#elif defined(OPENGL_AQUA)
aglDestroyPixelFormat(rwin->pixelFmtId);
aglDestroyContext(rwin->contextId);
aglDestroyPBuffer(rwin->windowId);
/* TODO FreePixMap */
#elif defined(OPENGL_WINDOWS)
wglDeleteContext(rwin->contextId);
DeleteDC(rwin->displayId);
DeleteObject(rwin->bitmapId);
#endif
G_free((void *)rwin);
}
/*!
\brief Create render window
\param rwin pointer to render_window struct
\param display display instance (NULL for offscreen)
\param width window width
\param height window height
\return 1
*/
int Nviz_create_render_window(struct render_window *rwin, void *display,
int width, int height)
{
#if defined(OPENGL_X11)
int attributeList[] = { GLX_RGBA, GLX_RED_SIZE, 1,
GLX_GREEN_SIZE, 1, GLX_BLUE_SIZE, 1,
GLX_DEPTH_SIZE, 1, None
};
XVisualInfo *v;
rwin->displayId = XOpenDisplay((char *)display);
if (!rwin->displayId) {
G_fatal_error(_("Bad server connection"));
}
v = glXChooseVisual(rwin->displayId,
DefaultScreen(rwin->displayId), attributeList);
rwin->contextId = glXCreateContext(rwin->displayId, v, NULL, GL_FALSE);
if (!rwin->contextId) {
G_fatal_error(_("Unable to create rendering context"));
}
/* create win pixmap to render to (same depth as RootWindow) */
rwin->pixmap = XCreatePixmap(rwin->displayId,
RootWindow(rwin->displayId, v->screen),
width, height, v->depth);
/* create an off-screen GLX rendering area */
rwin->windowId = glXCreateGLXPixmap(rwin->displayId, v, rwin->pixmap);
if (v) {
XFree(v);
}
#elif defined(OPENGL_AQUA)
int attributeList[] = { AGL_RGBA, AGL_RED_SIZE, 1,
AGL_GREEN_SIZE, 1, AGL_BLUE_SIZE, 1,
AGL_DEPTH_SIZE, 1, AGL_NONE
};
/* TODO: open mac display */
/* TODO: dev = NULL, ndev = 0 ? */
rwin->pixelFmtId = aglChoosePixelFormat(NULL, 0, attributeList);
rwin->contextId = aglCreateContext(rwin->pixelFmtId, NULL);
/* create an off-screen AGL rendering area */
aglCreatePBuffer(width, height, GL_TEXTURE_2D, GL_RGBA, 0, &(rwin->windowId));
#elif defined(OPENGL_WINDOWS)
PIXELFORMATDESCRIPTOR pfd = {
sizeof(PIXELFORMATDESCRIPTOR), // size of this pfd
1, /* version number */
PFD_DRAW_TO_WINDOW | /* support window */
PFD_SUPPORT_OPENGL | /* support OpenGL */
PFD_DOUBLEBUFFER, /* double buffered */
PFD_TYPE_RGBA, /* RGBA type */
24, /* 24-bit color depth */
0, 0, 0, 0, 0, 0, /* color bits ignored */
0, /* no alpha buffer */
0, /* shift bit ignored */
0, /* no accumulation buffer */
0, 0, 0, 0, /* accum bits ignored */
32, /* 32-bit z-buffer */
0, /* no stencil buffer */
0, /* no auxiliary buffer */
PFD_MAIN_PLANE, /* main layer */
0, /* reserved */
0, 0, 0 /* layer masks ignored */
};
int iPixelFormat;
rwin->displayId = CreateCompatibleDC(NULL);
iPixelFormat = ChoosePixelFormat(rwin->displayId, &pfd);
SetPixelFormat(rwin->displayId, iPixelFormat, &pfd);
rwin->bitmapId = CreateCompatibleBitmap(rwin->displayId, width, height);
SelectObject(rwin->displayId, rwin->bitmapId);
rwin->contextId = wglCreateContext(rwin->displayId);
/* TODO */
#endif
return 1;
}
/*!
\brief Make window current for rendering
\param win pointer to render_window struct
\return 1 on success
\return 0 on failure
*/
int Nviz_make_current_render_window(const struct render_window *rwin)
{
#if defined(OPENGL_X11)
if (!rwin->displayId || !rwin->contextId)
return 0;
if (rwin->contextId == glXGetCurrentContext())
return 1;
glXMakeCurrent(rwin->displayId, rwin->windowId, rwin->contextId);
#elif defined(OPENGL_AQUA)
if (!rwin->contextId)
return 0;
if (rwin->contextId == aglGetCurrentContext())
return 1;
aglSetCurrentContext(rwin->contextId);
aglSetPBuffer(rwin->contextId, rwin->windowId, 0, 0, 0);
#elif defined(OPENGL_WINDOWS)
if (!rwin->displayId || !rwin->contextId)
return 0;
wglMakeCurrent(rwin->displayId, rwin->contextId);
#endif
return 1;
}
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