int RE_InitOpenGlSubsystems(void)
{
#ifndef FEATURE_RENDERER_GLES
GLenum glewResult;
#endif
#if !defined(FEATURE_RENDERER_GLES)
#if defined(FEATURE_RENDERER2)
glewExperimental = GL_TRUE;
#endif
glewResult = glewInit();
if (GLEW_OK != glewResult)
{
// glewInit failed, something is seriously wrong
Ren_Fatal("GLW_StartOpenGL() - could not load OpenGL subsystem: %s", glewGetErrorString(glewResult));
}
else
{
Com_Printf("Using GLEW %s\n", glewGetString(GLEW_VERSION));
}
#endif
if (!GLimp_InitOpenGLContext())
{
return qfalse;
}
return qtrue;
}
static int GLimp_SetMode(int mode, qboolean fullscreen, qboolean noborder)
{
int perChannelColorBits;
int colorBits, depthBits, stencilBits;
int samples;
int i = 0;
SDL_Surface *icon = NULL;
SDL_DisplayMode desktopMode;
int display = 0;
int x = SDL_WINDOWPOS_UNDEFINED, y = SDL_WINDOWPOS_UNDEFINED;
Uint32 flags = SDL_WINDOW_OPENGL | SDL_WINDOW_INPUT_GRABBED;
#ifndef FEATURE_RENDERER_GLES
GLenum glewResult;
#endif
Ren_Print("Initializing OpenGL display\n");
if (r_allowResize->integer && !fullscreen)
{
flags |= SDL_WINDOW_RESIZABLE;
}
icon = SDL_CreateRGBSurfaceFrom(
(void *)CLIENT_WINDOW_ICON.pixel_data,
CLIENT_WINDOW_ICON.width,
CLIENT_WINDOW_ICON.height,
CLIENT_WINDOW_ICON.bytes_per_pixel * 8,
CLIENT_WINDOW_ICON.bytes_per_pixel * CLIENT_WINDOW_ICON.width,
#ifdef Q3_LITTLE_ENDIAN
0x000000FF, 0x0000FF00, 0x00FF0000, 0xFF000000
#else
0xFF000000, 0x00FF0000, 0x0000FF00, 0x000000FF
#endif
);
// If a window exists, note its display index
if (main_window != NULL)
{
display = SDL_GetWindowDisplayIndex(main_window);
}
if (SDL_GetDesktopDisplayMode(display, &desktopMode) == 0)
{
displayAspect = (float)desktopMode.w / (float)desktopMode.h;
Ren_Print("Estimated display aspect: %.3f\n", displayAspect);
}
else
{
Com_Memset(&desktopMode, 0, sizeof(SDL_DisplayMode));
Ren_Print("Cannot estimate display aspect, assuming 1.333\n");
}
Ren_Print("...setting mode %d: ", mode);
if (mode == -2)
{
// use desktop video resolution
if (desktopMode.h > 0)
{
glConfig.vidWidth = desktopMode.w;
glConfig.vidHeight = desktopMode.h;
}
else
{
glConfig.vidWidth = 640;
glConfig.vidHeight = 480;
Ren_Print("Cannot determine display resolution, assuming 640x480\n");
}
glConfig.windowAspect = (float)glConfig.vidWidth / (float)glConfig.vidHeight;
}
else if (!R_GetModeInfo(&glConfig.vidWidth, &glConfig.vidHeight, &glConfig.windowAspect, mode))
{
Ren_Print("invalid mode\n");
return RSERR_INVALID_MODE;
}
Ren_Print("%dx%d\n", glConfig.vidWidth, glConfig.vidHeight);
// Center window
if (r_centerWindow->integer && !fullscreen)
{
x = (desktopMode.w / 2) - (glConfig.vidWidth / 2);
y = (desktopMode.h / 2) - (glConfig.vidHeight / 2);
}
// Destroy existing state if it exists
if (SDL_glContext != NULL)
{
SDL_GL_DeleteContext(SDL_glContext);
SDL_glContext = NULL;
}
if (main_window != NULL)
{
SDL_GetWindowPosition(main_window, &x, &y);
Ren_Developer("Existing window at %dx%d before being destroyed\n", x, y);
SDL_DestroyWindow(main_window);
main_window = NULL;
}
if (fullscreen)
{
if (r_mode->integer == -2)
{
flags |= SDL_WINDOW_FULLSCREEN_DESKTOP;
}
else
{
flags |= SDL_WINDOW_FULLSCREEN;
}
glConfig.isFullscreen = qtrue;
}
else
{
if (noborder)
{
flags |= SDL_WINDOW_BORDERLESS;
}
glConfig.isFullscreen = qfalse;
}
colorBits = r_colorbits->value;
if ((!colorBits) || (colorBits >= 32))
{
colorBits = 24;
}
if (!r_depthbits->value)
{
depthBits = 24;
}
else
{
depthBits = r_depthbits->value;
}
stencilBits = r_stencilbits->value;
samples = r_ext_multisample->value;
for (i = 0; i < 16; i++)
{
int testColorBits, testDepthBits, testStencilBits;
// 0 - default
// 1 - minus colorBits
// 2 - minus depthBits
// 3 - minus stencil
if ((i % 4) == 0 && i)
{
// one pass, reduce
switch (i / 4)
{
case 2:
if (colorBits == 24)
{
colorBits = 16;
}
break;
case 1:
if (depthBits == 32)
{
depthBits = 24;
}
else if (depthBits == 24)
{
depthBits = 16;
}
else if (depthBits == 16)
{
depthBits = 8;
}
case 3: // fall through
if (stencilBits == 24)
{
stencilBits = 16;
}
else if (stencilBits == 16)
{
stencilBits = 8;
}
}
}
testColorBits = colorBits;
testDepthBits = depthBits;
testStencilBits = stencilBits;
if ((i % 4) == 3) // reduce colorbits
{
if (testColorBits == 24)
{
testColorBits = 16;
}
}
if ((i % 4) == 2) // reduce depthbits
{
if (testDepthBits == 24)
{
testDepthBits = 16;
}
else if (testDepthBits == 16)
{
testDepthBits = 8;
}
}
if ((i % 4) == 1) // reduce stencilbits
{
if (testStencilBits == 24)
{
testStencilBits = 16;
}
else if (testStencilBits == 16)
{
testStencilBits = 8;
}
else
{
testStencilBits = 0;
}
}
if (testColorBits == 24)
{
perChannelColorBits = 8;
}
else
{
perChannelColorBits = 4;
}
#ifdef __sgi // Fix for SGIs grabbing too many bits of color
if (perChannelColorBits == 4)
{
perChannelColorBits = 0; /* Use minimum size for 16-bit color */
}
// Need alpha or else SGIs choose 36+ bit RGB mode
SDL_GL_SetAttribute(SDL_GL_ALPHA_SIZE, 1);
#endif
SDL_GL_SetAttribute(SDL_GL_RED_SIZE, perChannelColorBits);
SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE, perChannelColorBits);
SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE, perChannelColorBits);
SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, testDepthBits);
SDL_GL_SetAttribute(SDL_GL_STENCIL_SIZE, testStencilBits);
SDL_GL_SetAttribute(SDL_GL_MULTISAMPLEBUFFERS, samples ? 1 : 0);
SDL_GL_SetAttribute(SDL_GL_MULTISAMPLESAMPLES, samples);
// SDL2 uses opengl by default, if we want opengl es we need to set this attribute
//SDL_GL_SetAttribute(SDL_GL_CONTEXT_EGL, 1);
if (r_stereoEnabled->integer)
{
glConfig.stereoEnabled = qtrue;
SDL_GL_SetAttribute(SDL_GL_STEREO, 1);
}
else
{
glConfig.stereoEnabled = qfalse;
SDL_GL_SetAttribute(SDL_GL_STEREO, 0);
}
SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
// If not allowing software GL, demand accelerated
if (!r_allowSoftwareGL->integer)
{
SDL_GL_SetAttribute(SDL_GL_ACCELERATED_VISUAL, 1);
}
main_window = SDL_CreateWindow(CLIENT_WINDOW_TITLE, x, y, glConfig.vidWidth, glConfig.vidHeight, flags | SDL_WINDOW_SHOWN);
if (!main_window)
{
Ren_Developer("SDL_CreateWindow failed: %s\n", SDL_GetError());
continue;
}
//This is disabled since at least now we have no use for this
/*
if (!Glimp_Create2DRenderer(main_window))
{
continue;
}
*/
if (fullscreen)
{
SDL_DisplayMode mode;
switch (testColorBits)
{
case 16: mode.format = SDL_PIXELFORMAT_RGB565; break;
case 24: mode.format = SDL_PIXELFORMAT_RGB24; break;
default: Ren_Developer("testColorBits is %d, can't fullscreen\n", testColorBits); continue;
}
mode.w = glConfig.vidWidth;
mode.h = glConfig.vidHeight;
mode.refresh_rate = glConfig.displayFrequency = ri.Cvar_VariableIntegerValue("r_displayRefresh");
mode.driverdata = NULL;
if (SDL_SetWindowDisplayMode(main_window, &mode) < 0)
{
Ren_Developer("SDL_SetWindowDisplayMode failed: %s\n", SDL_GetError());
continue;
}
}
SDL_SetWindowIcon(main_window, icon);
#if defined(FEATURE_RENDERER2)
glewExperimental = GL_TRUE;
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3);
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 2);
SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE);
SDL_GL_SetAttribute(SDL_GL_CONTEXT_FLAGS, SDL_GL_CONTEXT_FORWARD_COMPATIBLE_FLAG);
#endif
if ((SDL_glContext = SDL_GL_CreateContext(main_window)) == NULL)
{
Ren_Developer("SDL_GL_CreateContext failed: %s\n", SDL_GetError());
continue;
}
SDL_GL_MakeCurrent(main_window, SDL_glContext);
SDL_GL_SetSwapInterval(r_swapInterval->integer);
glConfig.colorBits = testColorBits;
glConfig.depthBits = testDepthBits;
glConfig.stencilBits = testStencilBits;
ri.Printf(PRINT_ALL, "Using %d color bits, %d depth, %d stencil display.\n",
glConfig.colorBits, glConfig.depthBits, glConfig.stencilBits);
break;
}
GLimp_DetectAvailableModes();
#if !defined(FEATURE_RENDERER_GLES)
glewResult = glewInit();
if (GLEW_OK != glewResult)
{
// glewInit failed, something is seriously wrong
Ren_Fatal("GLW_StartOpenGL() - could not load OpenGL subsystem: %s", glewGetErrorString(glewResult));
}
else
{
Ren_Print("Using GLEW %s\n", glewGetString(GLEW_VERSION));
}
#endif
if (!GLimp_InitOpenGLContext())
{
return RSERR_OLD_GL;
}
if (!main_window) //|| !main_renderer)
{
Ren_Print("Couldn't get a visual\n");
return RSERR_INVALID_MODE;
}
SDL_FreeSurface(icon);
return RSERR_OK;
}