[Add] space_renderOverlay().

src/lephisto.c

@@ -369,6 +369,7 @@ static void render_all(void) {
   pilots_render();
   weapons_render(WEAPON_LAYER_FG);
   spfx_render(SPFX_LAYER_BACK);
+  space_renderOverlay();
   /* FG. */
   player_render();
   spfx_render(SPFX_LAYER_FRONT);

src/nebulae.c

@@ -8,6 +8,7 @@
 #include "opengl.h"
 #include "lfile.h"
 #include "rng.h"
+#include "menu.h"
 #include "perlin.h"
 
 #define NEBU_DT_MAX           5.
@@ -15,6 +16,8 @@
 #define NEBULAE_Z             16  /* Z plane. */
 #define NEBULAE_PATH          "gen/nebu_%02d.png"
 
+extern double gui_xoff, gui_yoff;
+
 /* The nebulae textures. */
 static GLuint nebu_textures[NEBULAE_Z];
 static int nebu_w = 0;
@@ -134,6 +137,8 @@ void nebu_render(void) {
   glEnable(GL_TEXTURE_2D);
   glBindTexture(GL_TEXTURE_2D, nebu_textures[cur_nebu[1]]);
 
+  glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
+
   /* Texture 1. */
   glActiveTexture(GL_TEXTURE1);
   glEnable(GL_TEXTURE_2D);
@@ -182,7 +187,6 @@ void nebu_render(void) {
     glVertex2d(-SCREEN_W/2., SCREEN_H/2.);
   glEnd();
 
-  /* Clean up. */
   glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
   glDisable(GL_TEXTURE_2D);
   glActiveTexture(GL_TEXTURE0);
@@ -193,6 +197,89 @@ void nebu_render(void) {
   gl_checkErr();
 }
 
+void nebu_renderOverlay(double density) {
+#define ANG45   0.70710678118654757
+#define COS225  0.92387953251128674
+#define SIN225  0.38268343236508978
+  glShadeModel(GL_SMOOTH);
+  glMatrixMode(GL_PROJECTION);
+  glPushMatrix();
+  glTranslated(gui_xoff, gui_yoff, 0.);
+
+  /* Stuff player partially sees. */
+  glBegin(GL_TRIANGLE_FAN);
+    ACOLOUR(cPurple,              0.);
+    glVertex2d(0.,                0.);
+    ACOLOUR(cPurple,              1.);
+    glVertex2d(-density,          0.);
+    glVertex2d(-density*COS225,   density*SIN225);
+    glVertex2d(-density*ANG45,    density*ANG45);
+    glVertex2d(-density*SIN225,   density*COS225);
+    glVertex2d( 0.,               density);
+    glVertex2d( density*SIN225,   density*COS225);
+    glVertex2d( density*ANG45,    density*ANG45);
+    glVertex2d( density*COS225,   density*SIN225);
+    glVertex2d( density,          0.);
+    glVertex2d( density*COS225,   -density*SIN225);
+    glVertex2d( density*ANG45,    -density*ANG45);
+    glVertex2d( density*SIN225,   -density*COS225);
+    glVertex2d( 0.,               -density);
+    glVertex2d(-density*SIN225,   -density*COS225);
+    glVertex2d(-density*ANG45,    -density*ANG45);
+    glVertex2d(-density*COS225,   -density*SIN225);
+    glVertex2d(-density,          0.);
+  glEnd(); /* GL_TRIANGLE_FAN */
+
+  glShadeModel(GL_FLAT);
+
+  /* Stuff player can't see. */
+  glBegin(GL_TRIANGLE_STRIP);
+    ACOLOUR(cPurple,                    1.);
+    /* Start at the left. */
+    glVertex2d(-density,                0.);
+    glVertex2d(-density*COS225,         density*SIN225);
+    glVertex2d(-SCREEN_W/2.-gui_xoff,   SCREEN_H/2.-gui_yoff);
+    glVertex2d(-density*ANG45,          density*ANG45);
+    glVertex2d(-density*SIN225,         density*COS225);
+    glVertex2d(-SCREEN_W/2.-gui_xoff,   SCREEN_H/2.-gui_yoff);
+    glVertex2d( SCREEN_W/2.-gui_xoff,   SCREEN_H/2.-gui_yoff);
+    /* Move to the top. */
+    glVertex2d( 0.,                     density);
+    glVertex2d( density*SIN225,         density*COS225);
+    glVertex2d( SCREEN_W/2.-gui_xoff,   SCREEN_H/2.-gui_yoff);
+    glVertex2d( density*ANG45,          density*ANG45);
+    glVertex2d( density*COS225,         density*SIN225);
+    glVertex2d( SCREEN_W/2.-gui_xoff,   SCREEN_H/2.-gui_yoff);
+    /* Down to the right. */
+    glVertex2d( density,                0.);
+    glVertex2d( SCREEN_W/2.-gui_xoff,   -SCREEN_H/2.-gui_yoff);
+    glVertex2d( density*COS225,         -density*SIN225);
+    glVertex2d( SCREEN_W/2.-gui_xoff,   -SCREEN_H/2.-gui_yoff);
+    glVertex2d( density*ANG45,          -density*ANG45);
+    glVertex2d( density*SIN225,         -density*COS225);
+    glVertex2d( SCREEN_W/2.-gui_xoff,   -SCREEN_H/2.-gui_yoff);
+    glVertex2d( -SCREEN_W/2.-gui_xoff,  -SCREEN_H/2.-gui_yoff);
+    /* At the bottom. */
+    glVertex2d( 0.,                     -density);
+    glVertex2d(-density*SIN225,         -density*COS225);
+    glVertex2d(-SCREEN_W/2.-gui_xoff,   -SCREEN_H/2.-gui_yoff);
+    glVertex2d(-density*ANG45,          -density*ANG45);
+    glVertex2d(-density*COS225,         -density*SIN225);
+    glVertex2d(-SCREEN_W/2.-gui_xoff,   -SCREEN_H/2.-gui_yoff);
+    /* Back to origin. */
+    glVertex2d(-density,                0.);
+    glVertex2d(-SCREEN_W/2.-gui_xoff,   SCREEN_H/2.-gui_yoff);
+  glEnd(); /* GL_QUAD_STRIP */
+
+  glPopMatrix();
+
+  gl_checkErr();
+
+#undef ANG45
+#undef COS225
+#undef SIN225
+}
+
 /* Force generation of new nebulae. */
 void nebu_forceGenerate(void) {
   nebu_w = nebu_h = -9;

src/nebulae.h

@@ -1,11 +1,13 @@
 #pragma once
 
-/* Try to find nebulae to load, or generate if there isn't any. */
+/* Init/Exit. */
 void nebu_init(void);
-
 void nebu_exit(void);
 
+/* Render. */
 void nebu_render(void);
+void nebu_renderOverlay(double density);
 
+/* Misc. */
 void nebu_forceGenerate(void);
 

src/space.c

@@ -792,8 +792,16 @@ int space_load(void) {
 
 /* Render the system. -- Just playing god now. */
 void space_render(double dt) {
-  space_renderStars(dt);
+  if(cur_system->nebu_density > 0.)
-  /* nebu_render(); */
+    nebu_render();
+  else
+    space_renderStars(dt);
+}
+
+/* Render the overlay. */
+void space_renderOverlay(void) {
+  if(cur_system->nebu_density > 0.)
+    nebu_renderOverlay(cur_system->nebu_density);
 }
 
 /* Render stars. */

src/space.h

@@ -81,28 +81,31 @@ typedef struct Planet_ {
 
 /* Star systems. */
 typedef struct SystemFleet_ {
-  Fleet* fleet;         /* Fleet to appear. */
+  Fleet* fleet;           /* Fleet to appear. */
-  int chance;           /* Chance of fleet appearing in the system. */
+  int chance;             /* Chance of fleet appearing in the system. */
 } SystemFleet;
 
 typedef struct StarSystem_ {
-  char* name;           /* Star system identifier. */
+  char* name;             /* Star system identifier. */
-  Vec2 pos;             /* Position. */
+  Vec2 pos;               /* Position. */
-  int stars, asteroids; /* Un numero! */
+  int stars, asteroids;   /* Un numero! */
-  double interference;  /* Un uh.. Percentage. */
+  double interference;    /* Un uh.. Percentage. */
 
-  int faction;          /* Overall faction. */
+  int faction;            /* Overall faction. */
 
-  Planet* planets;      /* Planets. */
+  Planet* planets;        /* Planets. */
-  int nplanets;         /* Total number of planets. */
+  int nplanets;           /* Total number of planets. */
 
-  SystemFleet* fleets;  /* Fleets that can appear in the current system. */
+  SystemFleet* fleets;    /* Fleets that can appear in the current system. */
-  int nfleets;          /* Total number of fleets. */
+  int nfleets;            /* Total number of fleets. */
 
-  int* jumps;           /* Adjacent star system index number. */
+  int* jumps;             /* Adjacent star system index number. */
-  int njumps;           /* Number of adjacent jumps. */
+  int njumps;             /* Number of adjacent jumps. */
 
-  unsigned int flags;   /* Flags for system properties. */
+  double nebu_density;    /* Nebulae density. */
+  double nebu_volatility; /* Nebulae volatility - Not used yet. */
+
+  unsigned int flags;     /* Flags for system properties. */
 } StarSystem;
 
 extern StarSystem* cur_system; /* Current star system. */
@@ -118,6 +121,7 @@ Planet* planet_get(char* planetname);
 
 /* Render. */
 void space_render(double dt);
+void space_renderOverlay(void);
 void planets_render(void);
 
 /* Update. */