Changeset 4627 for OpenSceneGraph/trunk/examples/osgshaderterrain/osgshaderterrain.cpp

Timestamp:

10/28/05 10:35:55 (8 years ago)

Author:

robert

Message:

From Mike Weiblen, added check to make sure that vertex texture was
supported in the OpenGL driver.

Files:

• OpenSceneGraph/trunk/examples/osgshaderterrain/osgshaderterrain.cpp (modified) (7 diffs)

OpenSceneGraph/trunk/examples/osgshaderterrain/osgshaderterrain.cpp

@@ -5 +5 @@
 #include <osg/Geode>
 #include <osg/Geometry>
+#include <osg/GL2Extensions>
 #include <osg/Material>
 #include <osg/Math>
 #include <osg/MatrixTransform>
 #include <osg/PolygonOffset>
+#include <osg/Program>
 #include <osg/Projection>
+#include <osg/Shader>
 #include <osg/ShapeDrawable>
 #include <osg/StateSet>
 #include <osg/Switch>
 #include <osg/Texture2D>
+#include <osg/Uniform>
 
 #include <osgDB/ReadFile>
@@ -506 +510 @@
     for(r=0;r<numRows;++r)
     {
-        for(c=0;c<numColumns;++c)
-        {
-            min_z = osg::minimum(min_z,vertex[r+c*numRows][2]);
-            max_z = osg::maximum(max_z,vertex[r+c*numRows][2]);
-        }
+        for(c=0;c<numColumns;++c)
+        {
+            min_z = osg::minimum(min_z,vertex[r+c*numRows][2]);
+            max_z = osg::maximum(max_z,vertex[r+c*numRows][2]);
+        }
     }
         
@@ -520 +524 @@
     for(r=0;r<numRows;++r)
     {
-        for(c=0;c<numColumns;++c)
-        {
-            *((float*)(terrainImage->data(c,r))) = (vertex[r+c*numRows][2]-min_z)*scale_z;
-        }
+        for(c=0;c<numColumns;++c)
+        {
+            *((float*)(terrainImage->data(c,r))) = (vertex[r+c*numRows][2]-min_z)*scale_z;
+        }
     }
     
@@ -537 +541 @@
     if (image)
     {
-        osg::Texture2D* texture = new osg::Texture2D;
-        
-        texture->setImage(image);
-        stateset->setTextureAttributeAndModes(1,texture,osg::StateAttribute::ON);
+        osg::Texture2D* texture = new osg::Texture2D;
+        
+        texture->setImage(image);
+        stateset->setTextureAttributeAndModes(1,texture,osg::StateAttribute::ON);
     }
 
@@ -630 +634 @@
                 pos.x() = origin.x();
                 tex.x() = 0.0f;
-                for(c=0;c<numColumns;++c)
-                {
-                    v[vi].set(pos.x(),pos.y(),pos.z());
+                for(c=0;c<numColumns;++c)
+                {
+                    v[vi].set(pos.x(),pos.y(),pos.z());
                     pos.x()+=columnCoordDelta;
                     tex.x()+=columnTexDelta;
                     ++vi;
-                }
+                }
                 pos.y() += rowCoordDelta;
                 tex.y() += rowTexDelta;
@@ -650 +654 @@
                 geometry->addPrimitiveSet(&drawElements);
                 int ei=0;
-                for(c=0;c<numColumns;++c)
-                {
-                    drawElements[ei++] = (r+1)*numColumns+c;
-                    drawElements[ei++] = (r)*numColumns+c;
-                }
+                for(c=0;c<numColumns;++c)
+                {
+                    drawElements[ei++] = (r+1)*numColumns+c;
+                    drawElements[ei++] = (r)*numColumns+c;
+                }
             }
             
@@ -775 +779 @@
     viewer.realize();
 
+    // not all hardware can support vertex texturing, so check first.
+    for(unsigned int contextID = 0; 
+        contextID<viewer.getDisplaySettings()->getMaxNumberOfGraphicsContexts();
+        ++contextID)
+    {
+        osg::GL2Extensions* gl2ext = osg::GL2Extensions::Get(contextID,false);
+        if( gl2ext )
+        {
+            if( !gl2ext->isGlslSupported() )
+            {
+                std::cout<<"ERROR: GLSL not supported by OpenGL driver."<<std::endl;
+                return 1;
+            }
+
+            GLint numVertexTexUnits = 0;
+            glGetIntegerv( GL_MAX_VERTEX_TEXTURE_IMAGE_UNITS, &numVertexTexUnits );
+            if( numVertexTexUnits <= 0 )
+            {
+                std::cout<<"ERROR: vertex texturing not supported by OpenGL driver."<<std::endl;
+                return 1;
+            }
+        }
+    }
+
     while( !viewer.done() )
     {