Committing patch #25676 Anisotropic filtering in viewport and BGE by me.

This patch adds anisotropic filtering of textures in the viewport and the BGE. The quality of the filtering is adjustable in the user preferences under System. For more information on anisotropic filtering:
http://en.wikipedia.org/wiki/Anisotropic_filtering

One current limitation of this setup (having the option a user preference) is it makes runtimes more troublesome. Runtimes don't have user preferences set, so for now the blender player defaults to 2x AF. Options will be added later to change this value (probably a command line option).

1 files changed, 21 insertions, 0 deletions

diff --git a/source/blender/makesrna/intern/rna_userdef.c b/source/blender/makesrna/intern/rna_userdef.c
index 14af5ed7a3f..cf371fbf9bc 100644
--- a/source/blender/makesrna/intern/rna_userdef.c
+++ b/source/blender/makesrna/intern/rna_userdef.c
@@ -117,6 +117,12 @@ static void rna_userdef_mipmap_update(Main *bmain, Scene *scene, PointerRNA *ptr
 	rna_userdef_update(bmain, scene, ptr);
 }
 
+static void rna_userdef_anisotropic_update(Main *bmain, Scene *scene, PointerRNA *ptr)
+{
+	GPU_set_anisotropic(U.anisotropic_filter);
+	rna_userdef_update(bmain, scene, ptr);
+}
+
 static void rna_userdef_gl_texture_limit_update(Main *bmain, Scene *scene, PointerRNA *ptr)
 {
 	GPU_free_images();
@@ -2346,6 +2352,14 @@ static void rna_def_userdef_system(BlenderRNA *brna)
 		{128, "CLAMP_128", 0, "128", ""},
 		{0, NULL, 0, NULL, NULL}};
 
+	static EnumPropertyItem anisotropic_items[]  ={
+		{1, "FILTER_0", 0, "Off", ""},
+		{2, "FILTER_2", 0, "2x", ""},
+		{4, "FILTER_4", 0, "4x", ""},
+		{8, "FILTER_8", 0, "8x", ""},
+		{16, "FILTER_16", 0, "16x", ""},
+		{0, NULL, 0, NULL, NULL}};
+
 	static EnumPropertyItem audio_mixing_samples_items[] = {
 		{256, "SAMPLES_256", 0, "256", "Set audio mixing buffer size to 256 samples"},
 		{512, "SAMPLES_512", 0, "512", "Set audio mixing buffer size to 512 samples"},
@@ -2568,6 +2582,13 @@ static void rna_def_userdef_system(BlenderRNA *brna)
 	prop= RNA_def_property(srna, "use_antialiasing", PROP_BOOLEAN, PROP_NONE);
 	RNA_def_property_boolean_negative_sdna(prop, NULL, "gameflags", USER_DISABLE_AA);
 	RNA_def_property_ui_text(prop, "Anti-aliasing", "Use anti-aliasing for the 3D view (may impact redraw performance)");
+
+	prop= RNA_def_property(srna, "anisotropic_filter", PROP_ENUM, PROP_NONE);
+	RNA_def_property_enum_sdna(prop, NULL, "anisotropic_filter");
+	RNA_def_property_enum_items(prop, anisotropic_items);
+	RNA_def_property_enum_default(prop, 1);
+	RNA_def_property_ui_text(prop, "Anisotropic Filter", "The quality of the anisotropic filtering (values greater than 1.0 enable anisotropic filtering)");
+	RNA_def_property_update(prop, 0, "rna_userdef_anisotropic_update");
 	
 	prop= RNA_def_property(srna, "gl_texture_limit", PROP_ENUM, PROP_NONE);
 	RNA_def_property_enum_sdna(prop, NULL, "glreslimit");