Changeset 7520 in orxonox.OLD for branches/atmospheric_engine

Timestamp:

May 3, 2006, 4:14:27 PM (19 years ago)

Author:

amaechler

Message:

branches/atmospheric_engine:

Location:

branches/atmospheric_engine/src/lib/graphics/effects

Files:

• volfog_effect.cc (modified) (4 diffs)
• volfog_effect.h (modified) (1 diff)

branches/atmospheric_engine/src/lib/graphics/effects/volfog_effect.cc

@@ -21 +21 @@
 
 #include "shell_command.h"
+
+#define NUM_PANELS 6    /* number of panels in scene */
+
+typedef struct
+{
+        float x;
+        float y;
+        float z;
+} world_vector;         /* vertex data */
+
+world_vector vertices[NUM_PANELS*4] = {
+        {-5.0, -10.0, 0.0},{5.0, -10.0, 0.0},{5.0, 0.0, 0.0},{-5.0, 0.0, 0.0},
+        {-5.0, -10.0, 10.0},{-5.0, -10.0, 0.0},{-5.0, 0.0, 0.0},{-5.0, 0.0, 10.0},
+        {-5.0, -10.0, 20.0},{-5.0, -10.0, 10.0},{-5.0, 0.0, 10.0},{-5.0, 0.0, 20.0},
+        {5.0, -10.0, 0.0},{5.0, -10.0, 10.0},{5.0, 0.0, 10.0},{5.0, 0.0, 0.0},
+        {5.0, -10.0, 10.0},{5.0, -10.0, 20.0},{5.0, 0.0, 20.0},{5.0, 0.0, 10.0},
+        {-5.0, -10.0, 10.0},{5.0, -10.0, 10.0},{5.0, -10.0, 0.0},{-5.0, -10.0, 0.0}
+};
 
 using namespace std;
@@ -56 +74 @@
 
 bool VolFogEffect::init()
-{}
+{
+
+};
 
 
@@ -71 +91 @@
 
 
+void setFogColor(int v)
+{
+        float z;        /* distance of vertex from edge of fog volume */
+        float f;        /* fog factor */
+
+        z = 0.0 - vertices[v].y;
+        f = (10.0 - z) / (10.0 - 0.0);  /* linear fog: f = (end - z)/(end - start) */
+        glColor4f(0.6, 0.2, 0.0, f);
+}
+
+        int v;          /* store of next vertex ref */
+
 /**
  * draws the effect, if needed
@@ -76 +108 @@
 void VolFogEffect::draw() const
 {
-  PRINTF(0)("DRAW VolFogEffect\n");
+        // int v;               /* store of next vertex ref */
+        int ref;
+
+        PRINTF(0)("DRAW VolFogEffect\n");
+
+        for (ref=0; ref<NUM_PANELS; ref++) {
+
+                /* disable writes to z buffer (if fog area) */
+                glDepthMask(GL_FALSE);
+        
+                v = ref * 4;
+
+                /* restore z buffer writes, set blend params & disable texturing */
+
+                glDepthMask(GL_TRUE);
+                glEnable(GL_BLEND);
+                glBlendFunc(GL_ONE_MINUS_SRC_ALPHA, GL_SRC_ALPHA);
+                glDisable(GL_TEXTURE_2D);
+
+                /* draw the fog panel */
+
+                v = ref * 4;
+                glBegin(GL_QUADS);
+                setFogColor(v);
+                glVertex3f(vertices[v].x, vertices[v].y, vertices[v].z); v++;
+                setFogColor(v);
+                glVertex3f(vertices[v].x, vertices[v].y, vertices[v].z); v++;
+                setFogColor(v);
+                glVertex3f(vertices[v].x, vertices[v].y, vertices[v].z); v++;
+                setFogColor(v);
+                glVertex3f(vertices[v].x, vertices[v].y, vertices[v].z);
+                glEnd();
+
+                /* restore rendering state */
+
+                glEnable(GL_TEXTURE_2D);
+                glDisable(GL_BLEND);
+        }
+
+        
 }
 

branches/atmospheric_engine/src/lib/graphics/effects/volfog_effect.h

@@ -23 +23 @@
     virtual bool deactivate();
 
+    void test(int t);
+
+
     virtual void draw() const;
     virtual void tick(float dt);
 
-    void test(int t);
-
   private:
+    void set_fog_colour(int v);
 
 };