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

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

diff --git a/src/3dengfx/src/fxwt/init_glut.cpp b/src/3dengfx/src/fxwt/init_glut.cpp
new file mode 100644 (file)
index 0000000..3481f2f
--- /dev/null
+++ b/src/3dengfx/src/fxwt/init_glut.cpp
@@ -0,0 +1,162 @@
+/*
+This file is part of the 3dengfx, realtime visualization system.
+
+Copyright (C) 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 GLUT
+ *
+ * Author: John Tsiombikas 2005
+ * Modified: John Tsiombikas 2006
+ */
+
+#include "3dengfx_config.h"
+
+#if GFX_LIBRARY == GLUT
+
+#include <stdlib.h>
+#include "init.hpp"
+#include "gfx_library.h"
+#include "3dengfx/3denginefx.hpp"
+#include "common/err_msg.h"
+
+int fxwt_glut_win;
+
+bool fxwt::init_graphics(GraphicsInitParameters *gparams) {
+       info("Initializing GLUT");
+
+       // fabricate the command line args
+       char *argv[] = {"3dengfx", 0};
+       int argc = 1;
+       
+       glutInit(&argc, argv);
+       glutInitWindowSize(gparams->x, gparams->y);
+
+       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");
+
+       // determine color bits
+       int color_bits;
+       if(gparams->dont_care_flags & DONT_CARE_BPP) {
+               color_bits = 1;
+       } else {
+               switch(gparams->bpp) {
+               case 32:
+               case 24:
+                       color_bits = 8;
+                       break;
+
+               case 16:
+               case 15:
+                       color_bits = 5;
+                       break;
+
+               case 12:
+                       color_bits = 4;
+                       break;
+
+               default:
+                       error("%s: Tried to set unsupported pixel format: %d bpp", __func__, gparams->bpp);
+               }
+       }
+       
+       // construct the display mode
+       unsigned int disp_mode = GLUT_RGBA | GLUT_DOUBLE;
+       if(gparams->depth_bits) disp_mode |= GLUT_DEPTH;
+       if(gparams->stencil_bits) disp_mode |= GLUT_STENCIL;    
+       glutInitDisplayMode(disp_mode);
+
+       fxwt_glut_win = glutCreateWindow("3dengfx/glut");
+
+       int arbits, agbits, abbits, azbits, astencilbits;
+       arbits = glutGet(GLUT_WINDOW_RED_SIZE);
+       agbits = glutGet(GLUT_WINDOW_GREEN_SIZE);
+       abbits = glutGet(GLUT_WINDOW_BLUE_SIZE);
+       azbits = glutGet(GLUT_WINDOW_DEPTH_SIZE);
+       astencilbits = glutGet(GLUT_WINDOW_STENCIL_SIZE);
+       
+       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 - color_bits) > 1 && abs(agbits - color_bits) > 1 && abs(abbits - color_bits) > 1) {
+               error("%s: Could not set requested exact bpp mode", __func__);
+               glutDestroyWindow(fxwt_glut_win);
+               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__);
+                       glutDestroyWindow(fxwt_glut_win);
+                       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__);
+               glutDestroyWindow(fxwt_glut_win);
+               return false;
+       }
+
+       return true;
+}
+
+void fxwt::destroy_graphics() {
+       info("Shutting down GLUT");
+       glutDestroyWindow(fxwt_glut_win);
+}
+
+#ifdef __unix__
+#include <GL/glx.h>
+
+#ifndef GLX_ARB_get_proc_address
+#include <dlfcn.h>
+
+void *glXGetProcAddress(const char *name) {
+       char *err_str;
+       void *sym;
+       void *so = dlopen("libGL.so", RTLD_LAZY);
+       if(!so) {
+               perror("dlopen failed");
+               return 0;
+       }
+       
+       dlerror();
+       sym = dlsym(so, name);
+       if((err_str = dlerror())) {
+               fprintf(stderr, "dlsym failed: %s\n", err_str);
+               sym = 0;
+       }
+       
+       dlclose(so);
+       return sym;
+}
+#endif // GLX_ARB_get_proc_address
+
+#endif // __unix__
+
+#endif // GFX_LIBRARY == GLUT