From http://www.jwz.org/xscreensaver/xscreensaver-5.38.tar.gz

[xscreensaver] / hacks / glx / engine.c

diff --git a/hacks/glx/engine.c b/hacks/glx/engine.c
index 753eff6679dd53b196c53fd15bf31d937288ed46..0f39b8da7af640d7308a7fb42ba032085832053d 100644 (file)
--- a/hacks/glx/engine.c
+++ b/hacks/glx/engine.c
@@ -27,7 +27,8 @@
                        "*suppressRotationAnimation: True\n" \
        "*titleFont:  -*-helvetica-medium-r-normal-*-*-180-*-*-*-*-*-*\n" \
 
-# define refresh_engine 0
+# define free_engine 0
+# define release_engine 0
 # include "xlockmore.h"              /* from the xscreensaver distribution */
 #else  /* !STANDALONE */
 # include "xlock.h"                  /* from the xlockmore distribution */
@@ -78,7 +79,7 @@ ENTRYPOINT ModeSpecOpt engine_opts = {countof(opts), opts, countof(vars), vars,
 
 #ifdef USE_MODULES
 ModStruct   engine_description =
-{"engine", "init_engine", "draw_engine", "release_engine",
+{"engine", "init_engine", "draw_engine", NULL,
  "draw_engine", "init_engine", NULL, &engine_opts,
  1000, 1, 2, 1, 4, 1.0, "",
  "A four stroke engine", 0, NULL};
@@ -846,11 +847,19 @@ static int makeshaft (Engine *e)
 ENTRYPOINT void reshape_engine(ModeInfo *mi, int width, int height)
 {
  Engine *e = &engine[MI_SCREEN(mi)];
- glViewport(0,0,(GLint)width, (GLint) height);
+ double h = (GLfloat) height / (GLfloat) width;  
+ int y = 0;
+
+ if (width > height * 5) {   /* tiny window: show middle */
+   height = width * 9/16;
+   y = -height/2;
+   h = height / (GLfloat) width;
+ }
+
+ glViewport(0, y, width, height);
  glMatrixMode(GL_PROJECTION);
  glLoadIdentity();
-/* glFrustum(-1.0,1.0,-1.0,1.0,1.5,70.0);*/
- gluPerspective(40.0,((GLdouble)width)/height,1.5,70.0);
+ gluPerspective(40, 1/h, 1.5, 70.0);
  glMatrixMode(GL_MODELVIEW);
  e->win_h = height; 
  e->win_w = width;
@@ -862,11 +871,7 @@ ENTRYPOINT void init_engine(ModeInfo *mi)
   int screen = MI_SCREEN(mi);
   Engine *e;
 
- if (engine == NULL) {
-   if ((engine = (Engine *) calloc(MI_NUM_SCREENS(mi),
-                                        sizeof(Engine))) == NULL)
-          return;
- }
+ MI_INIT(mi, engine);
  e = &engine[screen];
  e->window = MI_WINDOW(mi);
 
@@ -996,16 +1001,6 @@ ENTRYPOINT void draw_engine(ModeInfo *mi)
   glXSwapBuffers(disp, w);
 }
 
-ENTRYPOINT void
-release_engine(ModeInfo *mi) 
-{
-  if (engine != NULL) {
-   (void) free((void *) engine);
-   engine = NULL;
-  }
-  FreeAllGL(mi);
-}
-
 XSCREENSAVER_MODULE ("Engine", engine)
 
 #endif