added support for user defined internal format at image file loader

include/ACGL/OpenGL/Controller/TextureControlFile.hh

@@ -33,7 +33,8 @@ public:
         mAnisotropicFilter(0.0f),
         mWrapS(0),
         mWrapT(0),
-        mWrapR(0)
+        mWrapR(0),
+        mInternalFormat(GL_INVALID_ENUM)
     {}
     virtual ~TextureControlFile(void) {}
 
@@ -44,6 +45,7 @@ public:
     inline TextureControlFile& minFilter (GLint _minFilter) { mMinFilter = _minFilter; return *this; }
     inline TextureControlFile& magFilter (GLint _magFilter) { mMagFilter = _magFilter; return *this; }
     inline TextureControlFile& anisotropicFilter (GLfloat _anisotropicFilter) { mAnisotropicFilter = _anisotropicFilter; return *this; }
+    inline TextureControlFile& internalFormat(GLenum _internalFormat) { mInternalFormat = _internalFormat; }
 
     inline TextureControlFile& wrap (GLenum _wrapS, GLenum _wrapT = 0, GLenum _wrapR = 0)
     {
@@ -74,6 +76,7 @@ protected:
     GLenum  mWrapS;
     GLenum  mWrapT;
     GLenum  mWrapR;
+    GLenum  mInternalFormat;
 };
 
 } // OpenGL

src/ACGL/OpenGL/Controller/TextureControlFile.cc

@@ -16,7 +16,8 @@ TextureControlFile::TextureControlFile(const std::string& _filename)
     mAnisotropicFilter(0.0f),
     mWrapS(0),
     mWrapT(0),
-    mWrapR(0)
+    mWrapR(0),
+    mInternalFormat(GL_INVALID_ENUM)
 {
     if(!mDataController)
         ACGL::Utils::error() << "No valid texture controller to load the image. Perhaps there is no loader for that file extension: " << _filename << std::endl;
@@ -30,7 +31,8 @@ TextureControlFile::TextureControlFile(const char* _filename)
     mAnisotropicFilter(0.0f),
     mWrapS(0),
     mWrapT(0),
-    mWrapR(0)
+    mWrapR(0),
+    mInternalFormat(GL_INVALID_ENUM)
 {
     if(!mDataController)
         ACGL::Utils::error() << "No valid texture controller to load the image. Perhaps there is no loader for that file extension: " << _filename << std::endl;
@@ -47,11 +49,18 @@ bool TextureControlFile::load(SharedTexture& texture)
         return false;
 
     texture->bind();
+    GLenum internalFormat;
+    if (mInternalFormat == GL_INVALID_ENUM) {
+        internalFormat = tempData->getFormat();
+    } else {
+        internalFormat = mInternalFormat;
+    }
+
     texture->setImageData2D(
             tempData->getData(),
             tempData->getWidth(),
             tempData->getHeight(),
-            tempData->getFormat(),
+            internalFormat,
             tempData->getFormat(),
             tempData->getType());
     texture->generateMipmaps();