[Add] Some more gas giant rendering work. Now procedurally generated!

[Add] Some Screenies.

src/mtrand.h

@@ -75,6 +75,10 @@ public:
     return 0;
   }
 
+  double drange(double min, double max) {
+    return (*this)(max-min)+min;
+  }
+
   double operator()(double max) {
     /* Divided by 2^32 */
     return max*static_cast<double>(rand_int32()) * (1./4294967296.);

src/object_viewer_view.cpp

@@ -31,14 +31,12 @@ void ObjectViewerView::Draw3D(void) {
   pos = matrix4x4d::RotateYMatrix(-DEG_2_RAD*rot) * pos;
   pos = matrix4x4d::RotateXMatrix(-DEG_2_RAD*rot) * pos;
 
-  /*
   float lightPos[4];
-  lightPos[0] = 0;
-  lightPos[1] = 0;
-  lightPos[2] = 0;
+  lightPos[0] = 1;
+  lightPos[1] = 1;
+  lightPos[2] = 1;
   lightPos[3] = 0;
   glLightfv(GL_LIGHT0, GL_POSITION, lightPos);
-  */
 
   /* SBRE rendering (See ModelBody.cpp) uses this.. */
   glRotatef(-rot, 0, 1, 0);

src/planet.cpp

@@ -81,11 +81,6 @@ void subdivide(vector3d& v1, vector3d& v2, vector3d& v3, vector3d& v4, int depth
 }
 
 void DrawLovelyRoundCube(double radius) {
-  const float mdiff[]     = { 1.0, 0.8, 0.5, 1.0 };
-  const float mambient[]  = {0.1, 0.08, 0.05, 1.0 };
-  glMaterialfv(GL_FRONT, GL_AMBIENT, mambient);
-  glMaterialfv(GL_FRONT, GL_DIFFUSE, mdiff);
-
   vector3d p1(1, 1, 1);
   vector3d p2(-1, 1, 1);
   vector3d p3(-1, -1, 1);
@@ -127,16 +122,9 @@ void DrawLovelyRoundCube(double radius) {
 }
 
 /* Both arguments in radians. */
-void DrawHoop(float latitude, float width, const float col[4]) {
+void DrawHoop(float latitude, float width, float wobble, MTRand& rng) {
   glPushAttrib(GL_DEPTH_BUFFER_BIT);
   glDisable(GL_DEPTH_TEST);
-  float mambient[4];
-  mambient[0] = col[0]*.1;
-  mambient[1] = col[1]*.1;
-  mambient[2] = col[2]*.1;
-  mambient[3] = col[3];
-  glMaterialfv(GL_FRONT, GL_AMBIENT, mambient);
-  glMaterialfv(GL_FRONT, GL_DIFFUSE, col);
   glEnable(GL_NORMALIZE);
   glEnable(GL_BLEND);
 
@@ -144,7 +132,7 @@ void DrawHoop(float latitude, float width, const float col[4]) {
     for(double longitude=0.0f; longitude < 2*M_PI; longitude += 0.02) {
       vector3d v;
       double l;
-      l = latitude+0.5*width;
+      l = latitude+0.5*width+rng(wobble*width);
       v.x = sin(longitude)*cos(l);
       v.y = sin(l);
       v.z = cos(longitude)*cos(l);
@@ -152,7 +140,7 @@ void DrawHoop(float latitude, float width, const float col[4]) {
       glNormal3dv(&v.x);
       glVertex3dv(&v.x);
 
-      l = latitude-0.5*width;
+      l = latitude-0.5*width-rng(wobble*width);
       v.x = sin(longitude)*cos(l);
       v.y = sin(l);
       v.z = cos(longitude)*cos(l);
@@ -161,17 +149,13 @@ void DrawHoop(float latitude, float width, const float col[4]) {
     }
     double l = latitude+0.5*width;
     vector3d v;
-    v.x = 0;
-    v.y = sin(l);
-    v.z = cos(l);
+    v.x = 0; v.y = sin(l); v.z = cos(l);
     v.Normalize();
     glNormal3dv(&v.x);
     glVertex3dv(&v.x);
 
     l = latitude-0.5*width;
-    v.x = 0;
-    v.y = sin(l);
-    v.z = cos(l);
+    v.x = 0; v.y = sin(l); v.z = cos(l);
     glNormal3dv(&v.x);
     glVertex3dv(&v.x);
   glEnd();
@@ -191,16 +175,9 @@ static void PutPolarPoint(float latitude, float longitude) {
   glVertex3dv(&v.x);
 }
 
-void DrawBlob(float latitude, float longitude, float a, float b, const  float col[4]) {
-  float mambient[4];
+void DrawBlob(float latitude, float longitude, float a, float b) {
   glPushAttrib(GL_DEPTH_BUFFER_BIT);
   glDisable(GL_DEPTH_TEST);
-  mambient[0] = col[0]*.1;
-  mambient[1] = col[1]*.1;
-  mambient[2] = col[2]*.1;
-  mambient[3] = col[3];
-  glMaterialfv(GL_FRONT, GL_AMBIENT, mambient);
-  glMaterialfv(GL_FRONT, GL_DIFFUSE, col);
   glEnable(GL_NORMALIZE);
   glEnable(GL_BLEND);
 
@@ -226,14 +203,17 @@ void DrawBlob(float latitude, float longitude, float a, float b, const  float co
 static void DrawRing(double inner, double outer, const float color[4]) {
   glPushAttrib(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT |
                GL_ENABLE_BIT | GL_LIGHTING_BIT | GL_POLYGON_BIT);
-  glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, color);
+  glDisable(GL_LIGHTING);
   glEnable(GL_BLEND);
   glEnable(GL_DEPTH_TEST);
   glEnable(GL_NORMALIZE);
   glLightModeli(GL_LIGHT_MODEL_TWO_SIDE, GL_TRUE);
   glDisable(GL_CULL_FACE);
 
+  glColor4fv(color);
+
   glBegin(GL_TRIANGLE_STRIP);
+  glNormal3f(0, 1, 0);
     for(float ang = 0; ang < 2*M_PI; ang+=0.1) {
       glVertex3f(inner*sin(ang), 0, inner*cos(ang));
       glVertex3f(outer*sin(ang), 0, outer*cos(ang));
@@ -269,30 +249,24 @@ static void SphereTriSubdivide(vector3d& v1, vector3d &v2, vector3d& v3, int dep
   }
 }
 
-/* 
+/*
  * yPos should be 1.0 for north pole, -1.0 for south pole.
  * size in radians.
  */
-static void DrawPole(double yPos, double size, const float col[4]) {
-  float mambient[4];
+static void DrawPole(double yPos, double size) {
   glPushAttrib(GL_DEPTH_BUFFER_BIT);
   glDisable(GL_DEPTH_TEST);
-  mambient[0] = col[0]*.1;
-  mambient[1] = col[1]*.1;
-  mambient[2] = col[2]*.1;
-  mambient[3] = col[3];
-  glMaterialfv(GL_FRONT, GL_AMBIENT, mambient);
-  glMaterialfv(GL_FRONT, GL_DIFFUSE, col);
   glEnable(GL_NORMALIZE);
   glEnable(GL_BLEND);
 
   const bool southPole = yPos < 0;
+  size = size*4/M_PI;
 
   vector3d center(0, yPos, 0);
   glBegin(GL_TRIANGLES);
     for(float ang = 2*M_PI; ang > 0; ang -= 0.1) {
-      vector3d v1(sin(ang), yPos, cos(ang));
-      vector3d v2(sin(ang+0.1), yPos, cos(ang+0.1));
+      vector3d v1(size*sin(ang), yPos, size*cos(ang));
+      vector3d v2(size*sin(ang+0.1), yPos, size*cos(ang+0.1));
       v1.Normalize();
       v2.Normalize();
       if(southPole)
@@ -307,6 +281,148 @@ static void DrawPole(double yPos, double size, const float col[4]) {
   glPopAttrib();
 }
 
+struct ColRangeObj_t {
+  float baseCol[4]; float modCol[4]; float modAll;
+
+  void GenCol(float col[4], MTRand& rng) const {
+    float ma = 1 + (rng(modAll*2)-modAll);
+    for(int i = 0; i < 4; i++) col[i] = baseCol[i] + rng.drange(-modCol[i], modCol[i]);
+    for(int i = 0; i < 3; i++) col[i] = CLAMP(ma*col[i], 0, 1);
+  }
+};
+
+struct GasGiantDef_t {
+  int hoopMin, hoopMax; float hoopWobble;
+  int blobMin, blobMax;
+  float poleMin, poleMax; /* Size range in radians. Zero for no poles. */
+  float ringProbability;
+  ColRangeObj_t ringCol;
+  ColRangeObj_t bodyCol;
+  ColRangeObj_t hoopCol;
+  ColRangeObj_t blobCol;
+  ColRangeObj_t poleCol;
+};
+
+static GasGiantDef_t ggdefs[] = {
+  {
+    /* Jupiter */
+    30, 40, 0.05,
+    20, 30,
+    0, 0,
+    0.5,
+    { { .61,.48,.384,.1 },  { 0, 0, 0, .9 }, 0.3 },
+    { { .99,.76,.62,1 },    { 0, .1, .1, 0 }, 0.3 },
+    { { .99,.76,.62,.5 },   { 0, .1, .1, 0 }, 0.3 },
+    { { .99,.76,.62,1 },    { 0, .1, .1, 0 }, 0.7 },
+  },
+  {
+    /* Saturnish */
+    10, 15, 0.0,
+    8, 20,    /* Blob range */
+    0.2, 0.2, /* Pole size */
+    0.5,
+    { { .61,.48,.384,.1 },  { 0, 0, 0, .9 }, 0.3 },
+    { { .87, .68, .39, 1 }, { 0, 0, 0, 0 }, 0.1 },
+    { { .87, .68, .39, 1 }, { 0, 0, 0, 0 }, 0.1 },
+    { { .87, .68, .39, 1 }, { 0, 0, 0, 0 }, 0.1 },
+    { { .77, .58, .29, 1 }, { 0, 0, 0, 0 }, 0.1 },
+  },
+  {
+    /* Neptunish */
+    3, 6, 0.0,
+    2, 6,
+    0, 0,
+    0.5,
+    { { .61,.48,.384,.1 },  { 0, 0, 0, .9 }, 0.3 },
+    { { .31,.44,.73,1 },    { 0, 0, 0, 0 }, .05 },   /* Body col */
+    { { .31,.44,.73,0.5 },  { 0, 0, 0, 0 }, .1 },  /* Hoop col */
+    { { .21,.34,.54,1 },    { 0, 0, 0, 0 }, .05 },   /* Blob col */
+  },
+  {
+    /* Uranus-like *wink* */
+    0, 0, 0.0,
+    0, 0,
+    0, 0,
+    0.5,
+    { { .61,.48,.384,.1 },  { 0, 0, 0, .9 }, 0.3 },
+    { { .70,.85,.86,1 },    { .1, .1, .1, 0 }, 0 },
+    { { .70,.85,.86,1 },    { .1, .1, .1, 0 }, 0 },
+    { { .70,.85,.86,1 },    { .1, .1, .1, 0 }, 0 },
+    { { .70,.85,.86,1 },    { .1, .1, .1, 0 }, 0 }
+  },
+  {
+    /* Brown dwarf-like */
+    0, 0, 0.05,
+    10, 20,
+    0, 0,
+    0.5,
+    { { .81,.48,.384,.1 }, { 0, 0, 0, .9 }, 0.3 },
+    { { .4,.1,0,1 }, { 0, 0, 0, 0 }, 0.1 },
+    { { .4,.1,0,1 }, { 0, 0, 0, 0 }, 0.1 },
+    { { .4,.1,0,1 }, { 0, 0, 0, 0 }, 0.1 },
+  },
+};
+
+static GasGiantDef_t &ggdef = ggdefs[0];
+
+#define PLANET_AMBIENT  0.1
+
+static void SetMaterialColor(const float col[4]) {
+  float mambient[4];
+  mambient[0] = col[0]*PLANET_AMBIENT;
+  mambient[1] = col[1]*PLANET_AMBIENT;
+  mambient[2] = col[2]*PLANET_AMBIENT;
+  mambient[3] = col[3];
+  glMaterialfv(GL_FRONT, GL_AMBIENT, mambient);
+  glMaterialfv(GL_FRONT, GL_DIFFUSE, col);
+}
+
+static void DrawGasGiant(void) {
+  MTRand rng((int)L3D::GetGameTime());
+  float col[4];
+
+  ggdef.bodyCol.GenCol(col, rng);
+  SetMaterialColor(col);
+  DrawLovelyRoundCube(1.0f);
+
+  int n = rng(ggdef.hoopMin, ggdef.hoopMax);
+
+  while(n-- > 0) {
+    ggdef.hoopCol.GenCol(col, rng);
+    SetMaterialColor(col);
+    DrawHoop(rng(0,9*M_PI)-0.45*M_PI, rng(0.25), ggdef.hoopWobble, rng);
+  }
+
+  n = rng(ggdef.blobMin, ggdef.blobMax);
+  while(n-- > 0) {
+    float a = rng.drange(0.01, 0.03);
+    float b = a+rng(0.2)+0.1;
+    ggdef.blobCol.GenCol(col, rng);
+    SetMaterialColor(col);
+    DrawBlob(rng.drange(-0.3*M_PI, 0.3*M_PI), rng(2*M_PI), a, b);
+  }
+
+  if(ggdef.poleMin != 0) {
+    float size = rng.drange(ggdef.poleMin, ggdef.poleMax);
+    ggdef.poleCol.GenCol(col, rng);
+    SetMaterialColor(col);
+    DrawPole(1.0, size);
+    DrawPole(-1.0, size);
+  }
+
+  if(rng(1.0) < ggdef.ringProbability) {
+    float pos = rng.drange(1.2, 1.7);
+    float end = pos + rng.drange(0.1, 1.0);
+    end = MIN(end, 2.5);
+    while(pos < end) {
+      float size = rng(0.1);
+      ggdef.ringCol.GenCol(col, rng);
+      DrawRing(pos, pos+size, col);
+      pos += size;
+    }
+  }
+}
+
 void Planet::Render(const Frame* a_camFrame) {
   glPushMatrix();
 
@@ -334,29 +450,7 @@ void Planet::Render(const Frame* a_camFrame) {
     glEnable(GL_LIGHTING);
   } else {
     glScalef(rad, rad, rad);
-    DrawLovelyRoundCube(1.0f);
-    const float col1[] = { 1, 1, 0, .7 };
-    const float col2[] = { 1, .2, 0, .7 };
-    const float col3[] = { .3, 1, 0, .7 };
-    const float col4[] = { 1, .6, 0, .7 };
-    const float col5[] = { 0, 0, 0.8, .7 };
-    const float white[] = { 1, 1, 1, 1 };
-    DrawHoop(M_PI/10.0, M_PI/20.0, col1);
-    DrawHoop(M_PI/12.0, M_PI/20.0, col2);
-    DrawHoop(0, M_PI/20.0, col2);
-    DrawHoop(-M_PI/10.0, M_PI/20.0, col3);
-    DrawHoop(M_PI/2 - M_PI/10.0, M_PI/20.0, col4);
-    DrawBlob(.2, -0.3, 0.05, 0.2, col5);
-    DrawBlob(.3, M_PI/2, 0.05, 0.2, col5);
-    DrawBlob(-.1, -M_PI/2, 0.05, 0.2, col5);
-    DrawPole(1.0, 0.1, white);
-    DrawPole(-1.0, 0.1, white);
-    DrawRing(1.5, 1.8, col1);
-    DrawRing(1.5, 1.8, col1);
-    DrawRing(1.9, 2.0, col1);
-    DrawRing(2.04, 2.3, col1);
-    //DrawBlob(1.0, 0, 0.02, 0.5, col5);
-    //DrawBlob(-1.0, 0, 0.02, 05, col5);
+    DrawGasGiant();
     glClear(GL_DEPTH_BUFFER_BIT);
   }
   glPopMatrix();