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GHOST: Add new interface to manage offscreen contexts.

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Offscreen contexts are not attached to a window and can only be used for rendering to frambuffer objects.

CGL implementation : Brecht Van Lommel (brecht)
GLX implementation : Clément Foucault (fclem)
WGL implementation : Germano Cavalcante (mano-wii)

Other implementation are just place holder for now.
This commit is contained in:
Clément Foucault
2018-02-26 19:10:15 +01:00
parent d6df23d9d9
commit 0940e89e60
25 changed files with 688 additions and 72 deletions
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94
intern/ghost/intern/GHOST_SystemWin32.cpp
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@@ -56,6 +56,12 @@
#include "GHOST_WindowManager.h"
#include "GHOST_WindowWin32.h"
#if defined(WITH_GL_EGL)
# include "GHOST_ContextEGL.h"
#else
# include "GHOST_ContextWGL.h"
#endif
#ifdef WITH_INPUT_NDOF
#include "GHOST_NDOFManagerWin32.h"
#endif
@@ -299,6 +305,94 @@ GHOST_IWindow *GHOST_SystemWin32::createWindow(
}
/**
* Create a new offscreen context.
* Never explicitly delete the window, use disposeContext() instead.
* \return The new context (or 0 if creation failed).
*/
GHOST_IContext *GHOST_SystemWin32::createOffscreenContext()
{
bool debug_context = false; /* TODO: inform as a parameter */
GHOST_Context *context;
#if defined(WITH_GL_PROFILE_CORE)
for (int minor = 5; minor >= 0; --minor) {
context = new GHOST_ContextWGL(
false, true, 0,
NULL, NULL,
WGL_CONTEXT_CORE_PROFILE_BIT_ARB,
4, minor,
(debug_context ? WGL_CONTEXT_DEBUG_BIT_ARB : 0),
GHOST_OPENGL_WGL_RESET_NOTIFICATION_STRATEGY);
if (context->initializeDrawingContext()) {
return context;
}
else {
delete context;
}
}
context = new GHOST_ContextWGL(
false, true, 0,
NULL, NULL,
WGL_CONTEXT_CORE_PROFILE_BIT_ARB,
3, 3,
(debug_context ? WGL_CONTEXT_DEBUG_BIT_ARB : 0),
GHOST_OPENGL_WGL_RESET_NOTIFICATION_STRATEGY);
if (context->initializeDrawingContext()) {
return context;
}
else {
MessageBox(
NULL,
"Blender requires a graphics driver with at least OpenGL 3.3 support.\n\n"
"The program will now close.",
"Blender - Unsupported Graphics Driver!",
MB_OK | MB_ICONERROR);
delete context;
exit();
}
#elif defined(WITH_GL_PROFILE_COMPAT)
// ask for 2.1 context, driver gives any GL version >= 2.1 (hopefully the latest compatibility profile)
// 2.1 ignores the profile bit & is incompatible with core profile
context = new GHOST_ContextWGL(
false, true, 0,
NULL, NULL,
0, // no profile bit
2, 1,
(debug_context ? WGL_CONTEXT_DEBUG_BIT_ARB : 0),
GHOST_OPENGL_WGL_RESET_NOTIFICATION_STRATEGY);
if (context->initializeDrawingContext()) {
return context;
}
else {
delete context;
}
#else
# error // must specify either core or compat at build time
#endif
return NULL;
}
/**
* Dispose of a context.
* \param context Pointer to the context to be disposed.
* \return Indication of success.
*/
GHOST_TSuccess GHOST_SystemWin32::disposeContext(GHOST_IContext *context)
{
delete context;
return GHOST_kSuccess;
}
bool GHOST_SystemWin32::processEvents(bool waitForEvent)
{
MSG msg;