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Improve SDL GL fallback code

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It now works even if window creation succeeds and only context creation fails.
Adapted from https://github.com/MoNTE48/Irrlicht . This should be fine
license-wise since that repo still contains the original Irrlicht license
(this is no legal advice).
Original PR: https://github.com/MoNTE48/Irrlicht/pull/9

Co-authored-by: Deve <deveee@gmail.com>
This commit is contained in:
Gregor Parzefall 2024-04-04 19:54:12 +02:00 committed by grorp
parent 07fdf7158d
commit cc1bfc6d03
2 changed files with 79 additions and 38 deletions
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115
irr/src/CIrrDeviceSDL.cpp
View File

@ -249,7 +249,7 @@ void CIrrDeviceSDL::resetReceiveTextInputEvents()
//! constructor
CIrrDeviceSDL::CIrrDeviceSDL(const SIrrlichtCreationParameters &param) :
CIrrDeviceStub(param),
Window((SDL_Window *)param.WindowId), SDL_Flags(0),
Window((SDL_Window *)param.WindowId),
MouseX(0), MouseY(0), MouseXRel(0), MouseYRel(0), MouseButtonStates(0),
Width(param.WindowSize.Width), Height(param.WindowSize.Height),
Resizable(param.WindowResizable == 1 ? true : false), CurrentTouchCount(0),
@ -382,6 +382,76 @@ void CIrrDeviceSDL::logAttributes()
bool CIrrDeviceSDL::createWindow()
{
if (Close)
return false;
if (createWindowWithContext())
return true;
while (CreationParams.AntiAlias > 0) {
CreationParams.AntiAlias--;
if (createWindowWithContext()) {
os::Printer::log("AntiAlias reduced/disabled due to lack of support!");
return true;
}
}
if (CreationParams.WithAlphaChannel) {
CreationParams.WithAlphaChannel = false;
if (createWindowWithContext()) {
os::Printer::log("WithAlphaChannel disabled due to lack of support!");
return true;
}
}
if (CreationParams.Stencilbuffer) {
CreationParams.Stencilbuffer = false;
if (createWindowWithContext()) {
os::Printer::log("Stencilbuffer disabled due to lack of support!");
return true;
}
}
while (CreationParams.ZBufferBits > 16) {
CreationParams.ZBufferBits -= 8;
if (createWindowWithContext()) {
os::Printer::log("ZBufferBits reduced due to lack of support!");
return true;
}
}
while (CreationParams.Bits > 16) {
CreationParams.Bits -= 8;
if (createWindowWithContext()) {
os::Printer::log("Bits reduced due to lack of support!");
return true;
}
}
if (CreationParams.Stereobuffer) {
CreationParams.Stereobuffer = false;
if (createWindowWithContext()) {
os::Printer::log("Stereobuffer disabled due to lack of support!");
return true;
}
}
if (CreationParams.Doublebuffer) {
// Try single buffer
CreationParams.Doublebuffer = false;
if (createWindowWithContext()) {
os::Printer::log("Doublebuffer disabled due to lack of support!");
return true;
}
}
os::Printer::log("Could not create window and context!", ELL_ERROR);
return false;
}
bool CIrrDeviceSDL::createWindowWithContext() {
u32 SDL_Flags = 0;
if (CreationParams.Fullscreen) {
#ifdef _IRR_EMSCRIPTEN_PLATFORM_
SDL_Flags |= SDL_WINDOW_FULLSCREEN;
@ -434,9 +504,6 @@ bool CIrrDeviceSDL::createWindow()
return true;
#else // !_IRR_EMSCRIPTEN_PLATFORM_
if (Close)
return false;
switch (CreationParams.DriverType) {
case video::EDT_OPENGL:
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 2);
@ -487,43 +554,22 @@ See discussion in https://github.com/minetest/minetest/pull/14498.
if (CreationParams.AntiAlias > 1) {
SDL_GL_SetAttribute(SDL_GL_MULTISAMPLEBUFFERS, 1);
SDL_GL_SetAttribute(SDL_GL_MULTISAMPLESAMPLES, CreationParams.AntiAlias);
}
if (!Window)
Window = SDL_CreateWindow("", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, Width, Height, SDL_Flags);
if (!Window) {
os::Printer::log("Could not create window...", SDL_GetError(), ELL_WARNING);
}
if (!Window && CreationParams.AntiAlias > 1) {
while (--CreationParams.AntiAlias > 1) {
SDL_GL_SetAttribute(SDL_GL_MULTISAMPLESAMPLES, CreationParams.AntiAlias);
Window = SDL_CreateWindow("", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, Width, Height, SDL_Flags);
if (Window)
break;
}
if (!Window) {
SDL_GL_SetAttribute(SDL_GL_MULTISAMPLEBUFFERS, 0);
SDL_GL_SetAttribute(SDL_GL_MULTISAMPLESAMPLES, 0);
Window = SDL_CreateWindow("", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, Width, Height, SDL_Flags);
if (Window)
os::Printer::log("AntiAliasing disabled due to lack of support!", ELL_WARNING);
}
} else {
SDL_GL_SetAttribute(SDL_GL_MULTISAMPLEBUFFERS, 0);
SDL_GL_SetAttribute(SDL_GL_MULTISAMPLESAMPLES, 0);
}
if (!Window && CreationParams.Doublebuffer) {
// Try single buffer
if (CreationParams.DriverType == video::EDT_OPENGL)
SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
Window = SDL_CreateWindow("", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, Width, Height, SDL_Flags);
}
Window = SDL_CreateWindow("", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, Width, Height, SDL_Flags);
if (!Window) {
os::Printer::log("Could not initialize display", SDL_GetError(), ELL_ERROR);
os::Printer::log("Could not create window", SDL_GetError(), ELL_WARNING);
return false;
}
Context = SDL_GL_CreateContext(Window);
if (!Context) {
os::Printer::log("Could not initialize context", SDL_GetError(), ELL_ERROR);
os::Printer::log("Could not create context", SDL_GetError(), ELL_WARNING);
SDL_DestroyWindow(Window);
Window = nullptr;
return false;
}
@ -1047,11 +1093,6 @@ void CIrrDeviceSDL::setResizable(bool resize)
return;
#else // !_IRR_EMSCRIPTEN_PLATFORM_
if (resize != Resizable) {
if (resize)
SDL_Flags |= SDL_WINDOW_RESIZABLE;
else
SDL_Flags &= ~SDL_WINDOW_RESIZABLE;
if (Window) {
SDL_SetWindowResizable(Window, (SDL_bool)resize);
}

2
irr/src/CIrrDeviceSDL.h
View File

@ -280,13 +280,13 @@ private:
void createDriver();
bool createWindow();
bool createWindowWithContext();
void createKeyMap();
void logAttributes();
SDL_GLContext Context;
SDL_Window *Window;
int SDL_Flags;
#if defined(_IRR_COMPILE_WITH_JOYSTICK_EVENTS_)
core::array<SDL_Joystick *> Joysticks;
#endif