added 3dengfx into the repo, probably not the correct version for this

[summerhack] / src / 3dengfx / src / fxwt / init_sdl.cpp

diff --git a/src/3dengfx/src/fxwt/init_sdl.cpp b/src/3dengfx/src/fxwt/init_sdl.cpp
new file mode 100644 (file)
index 0000000..5f53d86
--- /dev/null
+++ b/src/3dengfx/src/fxwt/init_sdl.cpp
@@ -0,0 +1,132 @@
+/*
+This file is part of the 3dengfx, realtime visualization system.
+
+Copyright (C) 2004, 2005 John Tsiombikas <nuclear@siggraph.org>
+
+3dengfx is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+3dengfx is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with 3dengfx; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+*/
+
+/* OpenGL through SDL
+ *
+ * Author: John Tsiombikas 2004
+ */
+
+#include "3dengfx_config.h"
+
+#if GFX_LIBRARY == SDL
+
+#include <stdlib.h>
+#include "init.hpp"
+#include "gfx_library.h"
+#include "3dengfx/3denginefx.hpp"
+#include "common/err_msg.h"
+
+bool fxwt::init_graphics(GraphicsInitParameters *gparams) {
+       info("Initializing SDL");
+
+       if(SDL_Init(SDL_INIT_VIDEO | SDL_INIT_TIMER | SDL_INIT_AUDIO | SDL_INIT_NOPARACHUTE) == -1) {
+               error("%s: Could not initialize SDL library.", __func__);
+               return false;
+       }
+
+       if(!gparams->fullscreen) {
+               const SDL_VideoInfo *vid_inf = SDL_GetVideoInfo();
+               gparams->bpp = vid_inf->vfmt->BitsPerPixel;
+       }
+
+       info("Trying to set video mode %dx%dx%d, d:%d s:%d %s", gparams->x, gparams->y, gparams->bpp, gparams->depth_bits, gparams->stencil_bits, gparams->fullscreen ? "fullscreen" : "windowed");
+       
+       int rbits, gbits, bbits;
+       switch(gparams->bpp) {
+       case 32:
+               rbits = gbits = bbits = 8;
+               break;
+               
+       case 16:
+               rbits = bbits = 5;
+               gbits = 6;
+               break;
+               
+       default:
+               error("%s: Tried to set unsupported pixel format: %d bpp", __func__, gparams->bpp);
+               return false;
+       }
+
+       SDL_GL_SetAttribute(SDL_GL_RED_SIZE, rbits);
+       SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE, gbits);
+       SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE, bbits);
+       SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, gparams->depth_bits);
+       SDL_GL_SetAttribute(SDL_GL_STENCIL_SIZE, gparams->stencil_bits);
+       SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
+
+       unsigned long flags = SDL_OPENGL;
+       if(gparams->fullscreen) flags |= SDL_FULLSCREEN;
+       if(!SDL_SetVideoMode(gparams->x, gparams->y, gparams->bpp, flags)) {
+               if(gparams->depth_bits == 32) gparams->depth_bits = 24;
+               SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, gparams->depth_bits);
+               
+               if(!SDL_SetVideoMode(gparams->x, gparams->y, gparams->bpp, flags)) {
+                       error("%s: Could not set requested video mode", __func__);
+               }
+       }
+
+       // now check the actual video mode we got
+       int arbits, agbits, abbits, azbits, astencilbits;
+       SDL_GL_GetAttribute(SDL_GL_RED_SIZE, &arbits);
+       SDL_GL_GetAttribute(SDL_GL_GREEN_SIZE, &agbits);
+       SDL_GL_GetAttribute(SDL_GL_BLUE_SIZE, &abbits);
+       SDL_GL_GetAttribute(SDL_GL_DEPTH_SIZE, &azbits);
+       SDL_GL_GetAttribute(SDL_GL_STENCIL_SIZE, &astencilbits);
+
+       info("Initialized video mode:");
+       info("    bpp: %d (%d%d%d)", arbits + agbits + abbits, arbits, agbits, abbits);
+       info("zbuffer: %d", azbits);
+       info("stencil: %d", astencilbits);
+
+       /* if the dont_care_flags does not contain DONT_CARE_BPP and our color bits
+        * does not match, we should return failure, however we test against
+        * the difference allowing a +/-1 difference in order to allow for 16bpp
+        * formats of either 565 or 555 and consider them equal.
+        */
+       if(!(gparams->dont_care_flags & DONT_CARE_BPP) && abs(arbits - rbits) > 1 && abs(agbits - gbits) > 1 && abs(abbits - bbits) > 1) {
+               error("%s: Could not set requested exact bpp mode", __func__);
+               return false;
+       }
+       
+       // now if we don't have DONT_CARE_DEPTH in the dont_care_flags check for 
+       // exact depth buffer format, however consider 24 and 32 bit the same
+       if(!(gparams->dont_care_flags & DONT_CARE_DEPTH) && azbits != gparams->depth_bits) {
+               if(!(gparams->depth_bits == 32 && azbits == 24 || gparams->depth_bits == 24 && azbits == 32)) {
+                       error("%s: Could not set requested exact zbuffer depth", __func__);
+                       return false;
+               }
+       }
+
+       // if we don't have DONT_CARE_STENCIL make sure we have the stencil format
+       // that was asked.
+       if(!(gparams->dont_care_flags & DONT_CARE_STENCIL) && astencilbits != gparams->stencil_bits) {
+               error("%s: Could not set exact stencil format", __func__);
+               return false;
+       }
+
+       return true;
+}
+
+
+void fxwt::destroy_graphics() {
+       info("Shutting down SDL...");
+       SDL_Quit();
+}
+#endif // SDL