Moved anisotropic filtering to Image:setFilter(min, mag, anisotropy), added anisotropic filtering support to canvases and fonts

src/modules/graphics/opengl/Canvas.cpp

@@ -19,8 +19,10 @@
  **/
 
 #include "Canvas.h"
+#include "Image.h"
 #include "Graphics.h"
 #include "common/Matrix.h"
+#include "common/config.h"
 
 #include <cstring> // For memcpy
 
@@ -315,6 +317,7 @@ Canvas::Canvas(int width, int height, TextureType texture_type)
 	vertices[3].t = 0;
 
 	settings.filter = Image::getDefaultFilter();
+	settings.anisotropy = Image::getDefaultAnisotropy();
 
 	getStrategy();
 
@@ -494,6 +497,24 @@ Image::Wrap Canvas::getWrap() const
 	return getTextureWrap();
 }
 
+void Canvas::setAnisotropy(float anisotropy)
+{
+	if (Image::hasAnisotropicFilteringSupport())
+	{
+		settings.anisotropy = std::min(std::max(anisotropy, 1.0f), Image::getMaxAnisotropy());
+
+		bindTexture(img);
+		glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAX_ANISOTROPY_EXT, settings.anisotropy);
+	}
+	else
+		settings.anisotropy = 1.0f;
+}
+
+float Canvas::getAnisotropy() const
+{
+	return settings.anisotropy;
+}
+
 bool Canvas::loadVolatile()
 {
 	status = strategy->createFBO(fbo, depth_stencil, img, width, height, texture_type);
@@ -502,6 +523,7 @@ bool Canvas::loadVolatile()
 
 	setFilter(settings.filter);
 	setWrap(settings.wrap);
+	setAnisotropy(settings.anisotropy);
 	Color c;
 	c.r = c.g = c.b = c.a = 0;
 	clear(c);