BGE: Adding two new functions to bge.render to allow users to change the anisotropic filtering level used by textures:

* setAnisotropicFiltering(level)
  * getAnisotropicFiltering()

doc/python_api/rst/bge.render.rst

@@ -215,7 +215,19 @@ Functions
    :type setting: string (lights, shaders, shadows, ramps, nodes, extra_textures)
    :rtype: boolean
 
+.. function:: setAnisotropicFiltering(level)
 
+   Set the anisotropic filtering level for textures.
+   
+   :arg level: The new anisotropic filtering level to use
+   :type level: integer (must be one of 1, 2, 4, 8, 16)
+   
+.. function:: getAnisotropicFiltering()
+
+   Get the anisotropic filtering level used for textures.
+   
+   :rtype: integer (one of 1, 2, 4, 8, 16)
+   
 .. function:: drawLine(fromVec,toVec,color)
 
    Draw a line in the 3D scene.

source/gameengine/Ketsji/KX_PythonInit.cpp

@@ -1208,6 +1208,28 @@ static PyObject* gPyGetMaterialType(PyObject*)
 	return PyLong_FromSsize_t(flag);
 }
 
+static PyObject* gPySetAnisotropicFiltering(PyObject*, PyObject* args)
+{
+	short level;
+
+	if (!PyArg_ParseTuple(args, "h:setAnisotropicFiltering", &level))
+		return NULL;
+
+	if (level != 1 && level != 2 && level != 4 && level != 8 && level != 16) {
+		PyErr_SetString(PyExc_ValueError, "Rasterizer.setAnisotropicFiltering(level): Expected value of 1, 2, 4, 8, or 16 for value");
+		return NULL;
+	}
+
+	gp_Rasterizer->SetAnisotropicFiltering(level);
+
+	Py_RETURN_NONE;
+}
+
+static PyObject* gPyGetAnisotropicFiltering(PyObject*, PyObject* args)
+{
+	return PyLong_FromLong(gp_Rasterizer->GetAnisotropicFiltering());
+}
+
 static PyObject* gPyDrawLine(PyObject*, PyObject* args)
 {
 	PyObject* ob_from;
@@ -1272,6 +1294,10 @@ static struct PyMethodDef rasterizer_methods[] = {
    METH_VARARGS, "set the state of a GLSL material setting"},
   {"getGLSLMaterialSetting",(PyCFunction) gPyGetGLSLMaterialSetting,
    METH_VARARGS, "get the state of a GLSL material setting"},
+  {"setAnisotropicFiltering", (PyCFunction) gPySetAnisotropicFiltering,
+  METH_VARARGS, "set the anisotropic filtering level (must be one of 1, 2, 4, 8, 16)"},
+  {"getAnisotropicFiltering", (PyCFunction) gPyGetAnisotropicFiltering,
+  METH_VARARGS, "get the anisotropic filtering level"},
   {"drawLine", (PyCFunction) gPyDrawLine,
    METH_VARARGS, "draw a line on the screen"},
   { NULL, (PyCFunction) NULL, 0, NULL }

source/gameengine/Rasterizer/RAS_IRasterizer.h

@@ -417,6 +417,9 @@ public:
 
 	virtual void	SetBlendingMode(int blendmode)=0;
 	virtual void	SetFrontFace(bool ccw)=0;
+
+	virtual void	SetAnisotropicFiltering(short level)=0;
+	virtual short	GetAnisotropicFiltering()=0;
 	
 	
 #ifdef WITH_CXX_GUARDEDALLOC

source/gameengine/Rasterizer/RAS_OpenGLRasterizer/RAS_OpenGLRasterizer.cpp

@@ -99,12 +99,16 @@ RAS_OpenGLRasterizer::RAS_OpenGLRasterizer(RAS_ICanvas* canvas)
 		hinterlace_mask[i] = (i&1)*0xFFFFFFFF;
 	}
 	hinterlace_mask[32] = 0;
+
+	m_prevafvalue = GPU_get_anisotropic();
 }
 
 
 
 RAS_OpenGLRasterizer::~RAS_OpenGLRasterizer()
 {
+	// Restore the previous AF value
+	GPU_set_anisotropic(m_prevafvalue);
 }
 
 bool RAS_OpenGLRasterizer::Init()
@@ -1204,3 +1208,12 @@ void RAS_OpenGLRasterizer::SetFrontFace(bool ccw)
 	m_last_frontface = ccw;
 }
 
+void RAS_OpenGLRasterizer::SetAnisotropicFiltering(short level)
+{
+	GPU_set_anisotropic((float)level);
+}
+
+short RAS_OpenGLRasterizer::GetAnisotropicFiltering()
+{
+	return (short)GPU_get_anisotropic();
+}

source/gameengine/Rasterizer/RAS_OpenGLRasterizer/RAS_OpenGLRasterizer.h

@@ -94,6 +94,8 @@ class RAS_OpenGLRasterizer : public RAS_IRasterizer
 	bool			m_setfocallength;
 	int				m_noOfScanlines;
 
+	short			m_prevafvalue;
+
 	//motion blur
 	int	m_motionblur;
 	float	m_motionblurvalue;
@@ -294,6 +296,9 @@ public:
 	virtual void	SetBlendingMode(int blendmode);
 	virtual void	SetFrontFace(bool ccw);
 	
+	virtual void	SetAnisotropicFiltering(short level);
+	virtual short	GetAnisotropicFiltering();
+	
 	
 #ifdef WITH_CXX_GUARDEDALLOC
 public: