X-Git-Url: http://git.tdb.fi/?p=libs%2Fgl.git;a=blobdiff_plain;f=source%2Ftexturing.cpp;h=ab5d39b4c42e2b38d51c9ba1dfea5258e851a23a;hp=d8d178b385c05e54da6d588df0e4866e6da1a460;hb=bec07999d95b76f4b47cffcc564d0cd0afc0435e;hpb=b856ccc893a102536048e8d67a6577a31ebdf166

diff --git a/source/texturing.cpp b/source/texturing.cpp
index d8d178b3..ab5d39b4 100644
--- a/source/texturing.cpp
+++ b/source/texturing.cpp
@@ -1,3 +1,4 @@
+#include <msp/core/hash.h>
 #include "texture.h"
 #include "texturing.h"
 #include "texunit.h"
@@ -13,34 +14,57 @@ Texturing::~Texturing()
 		unbind();
 }
 
-void Texturing::attach(unsigned attch, const Texture &tex)
+int Texturing::find_free_unit(const string &name_hint) const
 {
-	set_attachment(attch, &tex);
+	unsigned max_unit = TexUnit::get_n_units();
+	// Leave some space for effect textures
+	max_unit -= min(max_unit/4, 8U);
+	unsigned initial_unit = (name_hint.empty() ? 0 : hash32(name_hint)%max_unit);
+	unsigned unit = initial_unit;
+	while(get_attached_texture(unit) || get_attached_sampler(unit))
+	{
+		unit = (unit+1)%max_unit;
+		if(unit==initial_unit)
+			return -1;
+	}
+
+	return unit;
+}
+
+void Texturing::attach(unsigned attch, const Texture &tex, const Sampler *samp)
+{
+	set_attachment(attch, &tex, samp);
+}
+
+void Texturing::attach(unsigned attch, const Sampler &samp)
+{
+	set_attachment(attch, 0, &samp);
 }
 
 void Texturing::detach(unsigned attch)
 {
-	set_attachment(attch, 0);
+	set_attachment(attch, 0, 0);
 }
 
-void Texturing::set_attachment(unsigned unit, const Texture *tex)
+void Texturing::set_attachment(unsigned unit, const Texture *tex, const Sampler *samp)
 {
 	if(unit>=TexUnit::get_n_units())
 		throw out_of_range("Texturing::set_attachment");
 
-	if(tex)
+	if(tex || samp)
 	{
 		vector<Attachment>::iterator i;
 		for(i=attachments.begin(); (i!=attachments.end() && i->unit<=unit); ++i)
 			if(i->unit==unit)
 			{
 				i->texture = tex;
+				i->sampler = samp;
 				if(current()==this)
-					tex->bind_to(unit);
+					bind_attachment(*i);
 				return;
 			}
 
-		attachments.insert(i, Attachment(unit, tex));
+		attachments.insert(i, Attachment(unit, tex, samp));
 		if(current()==this)
 			tex->bind_to(unit);
 	}
@@ -51,7 +75,7 @@ void Texturing::set_attachment(unsigned unit, const Texture *tex)
 			{
 				attachments.erase(i);
 				if(current()==this)
-					Texture::unbind_from(unit);
+					unbind_attachment(unit);
 				return;
 			}
 	}
@@ -65,6 +89,14 @@ const Texture *Texturing::get_attached_texture(unsigned unit) const
 	return 0;
 }
 
+const Sampler *Texturing::get_attached_sampler(unsigned unit) const
+{
+	for(vector<Attachment>::const_iterator i=attachments.begin(); (i!=attachments.end() && i->unit<=unit); ++i)
+		if(i->unit==unit)
+			return i->sampler;
+	return 0;
+}
+
 void Texturing::bind() const
 {
 	const Texturing *old = current();
@@ -78,14 +110,14 @@ void Texturing::bind() const
 			{
 				if(i!=attachments.end() && (j==old->attachments.end() || i->unit<=j->unit))
 				{
-					i->texture->bind_to(i->unit);
+					bind_attachment(*i);
 					if(j!=old->attachments.end() && j->unit==i->unit)
 						++j;
 					++i;
 				}
 				else
 				{
-					Texture::unbind_from(j->unit);
+					unbind_attachment(j->unit);
 					++j;
 				}
 			}
@@ -93,25 +125,41 @@ void Texturing::bind() const
 		else
 		{
 			for(vector<Attachment>::const_iterator i=attachments.begin(); i!=attachments.end(); ++i)
-				i->texture->bind_to(i->unit);
+				bind_attachment(*i);
 		}
 	}
 }
 
+void Texturing::bind_attachment(const Attachment &attch) const
+{
+	if(attch.sampler)
+		attch.sampler->bind_to(attch.unit);
+	else
+		Sampler::unbind_from(attch.unit);
+	attch.texture->bind_to(attch.unit);
+}
+
 void Texturing::unbind()
 {
 	const Texturing *old = current();
 	if(set_current(0))
 	{
 		for(vector<Attachment>::const_iterator i=old->attachments.begin(); i!=old->attachments.end(); ++i)
-			Texture::unbind_from(i->unit);
+			unbind_attachment(i->unit);
 	}
 }
 
+void Texturing::unbind_attachment(unsigned unit)
+{
+	Texture::unbind_from(unit);
+	Sampler::unbind_from(unit);
+}
+
 
-Texturing::Attachment::Attachment(unsigned u, const Texture *t):
+Texturing::Attachment::Attachment(unsigned u, const Texture *t, const Sampler *s):
 	unit(u),
-	texture(t)
+	texture(t),
+	sampler(s)
 { }
 
 } // namespace GL