added function to get the number of channels from a texture format enum

include/ACGL/OpenGL/Data/TextureData.hh

@@ -49,7 +49,6 @@ public:
     GLsizei  getDepth   (void) const { return depth;   }
     GLenum   getFormat  (void) const { return format;  }
     GLenum   getType    (void) const { return type;    }
-
     // ========================================================================================================= \/
     // ================================================================================================= SETTERS \/
     // ========================================================================================================= \/

include/ACGL/OpenGL/Tools.hh

@@ -40,6 +40,30 @@ inline GLint getGLTypeSize ( GLenum _type )
     return 0;
 }
 
+inline GLuint getNumberOfChannels( GLenum _format )
+{
+    if (_format == GL_R || _format == GL_R8I  || _format == GL_R16I  || _format == GL_R32I
+                        || _format == GL_R8UI || _format == GL_R16UI || _format == GL_R32UI
+                                              || _format == GL_R16F  || _format == GL_R32F )   return 1;
+    if (_format == GL_RED_INTEGER || _format == GL_GREEN_INTEGER || _format == GL_BLUE_INTEGER || _format == GL_ALPHA_INTEGER) return 1;
+
+    if (_format == GL_RG || _format == GL_RG8I  || _format == GL_RG16I  || _format == GL_RG32I
+                         || _format == GL_RG8UI || _format == GL_RG16UI || _format == GL_RG32UI
+                                                || _format == GL_RG16F  || _format == GL_RG32F )   return 2;
+
+    if (_format == GL_RGB || _format == GL_RGB8I  || _format == GL_RGB16I  || _format == GL_RGB32I
+                          || _format == GL_RGB8UI || _format == GL_RGB16UI || _format == GL_RGB32UI
+                                                  || _format == GL_RGB16F  || _format == GL_RGB32F )   return 3;
+    if (_format == GL_BGR  || _format == GL_RGB_INTEGER  || _format == GL_BGR_INTEGER)  return 3;
+
+    if (_format == GL_RGBA || _format == GL_RGBA8I  || _format == GL_RGBA16I  || _format == GL_RGBA32I
+                           || _format == GL_RGBA8UI || _format == GL_RGBA16UI || _format == GL_RGBA32UI
+                                                    || _format == GL_RGBA16F  || _format == GL_RGBA32F )   return 4;
+    if (_format == GL_BGRA || _format == GL_RGBA_INTEGER || _format == GL_BGRA_INTEGER) return 4;
+
+    return 1; // unknown number of channels, assume 1
+}
+
 uint32_t getOpenGLMinorVersionNumber();
 uint32_t getOpenGLMajorVersionNumber();
 

src/ACGL/OpenGL/Objects/Texture.cc

@@ -114,7 +114,7 @@ SharedTextureData Texture::getImageData(GLint _lod, GLenum _type) const
     dataObject->setHeight(height);
     dataObject->setDepth(depth);
     dataObject->setType(_type);
-    dataObject->setFormat(GL_RGB);
+    dataObject->setFormat(mFormat);
     dataObject->setData(imageData); // dataObject will take care of freeing imageData
 
     return dataObject;