X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Ftexturing.cpp;h=c30216f139ebbf91e4a7fdcb53021e1fa6cbc39f;hb=66181b3f47322ffc9b8aebf04a8c222abe1a75a2;hp=db8ee65359a87993fe707fd0182bda4f210e1f51;hpb=f1b12c992db974c679d85ae6ec22cd318199d0d5;p=libs%2Fgl.git

diff --git a/source/texturing.cpp b/source/texturing.cpp
index db8ee653..c30216f1 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"
@@ -13,6 +14,23 @@ Texturing::~Texturing()
 		unbind();
 }
 
+int Texturing::find_free_unit(const string &name_hint) const
+{
+	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))
+	{
+		unit = (unit+1)%max_unit;
+		if(unit==initial_unit)
+			return -1;
+	}
+
+	return unit;
+}
+
 void Texturing::attach(unsigned attch, const Texture &tex)
 {
 	set_attachment(attch, &tex);
@@ -23,32 +41,46 @@ void Texturing::detach(unsigned attch)
 	set_attachment(attch, 0);
 }
 
-void Texturing::set_attachment(unsigned attch, const Texture *tex)
+void Texturing::set_attachment(unsigned unit, const Texture *tex)
 {
-	if(attch>=TexUnit::get_n_units())
+	if(unit>=TexUnit::get_n_units())
 		throw out_of_range("Texturing::set_attachment");
 
-	if(attachments.size()<=attch)
-		attachments.resize(attch+1);
-
-	attachments[attch].tex = tex;
-
-	if(current()==this)
-		bind_attachment(attch);
-}
-
-void Texturing::bind_attachment(unsigned i) const
-{
-	const Attachment &attch = attachments[i];
-	if(attch.tex)
-		attch.tex->bind_to(i);
+	if(tex)
+	{
+		vector<Attachment>::iterator i;
+		for(i=attachments.begin(); (i!=attachments.end() && i->unit<=unit); ++i)
+			if(i->unit==unit)
+			{
+				i->texture = tex;
+				if(current()==this)
+					tex->bind_to(unit);
+				return;
+			}
+
+		attachments.insert(i, Attachment(unit, tex));
+		if(current()==this)
+			tex->bind_to(unit);
+	}
 	else
-		Texture::unbind_from(i);
+	{
+		for(vector<Attachment>::iterator i=attachments.begin(); (i!=attachments.end() && i->unit<=unit); ++i)
+			if(i->unit==unit)
+			{
+				attachments.erase(i);
+				if(current()==this)
+					Texture::unbind_from(unit);
+				return;
+			}
+	}
 }
 
-void Texturing::unbind_attachment(unsigned i)
+const Texture *Texturing::get_attached_texture(unsigned unit) const
 {
-	Texture::unbind_from(i);
+	for(vector<Attachment>::const_iterator i=attachments.begin(); (i!=attachments.end() && i->unit<=unit); ++i)
+		if(i->unit==unit)
+			return i->texture;
+	return 0;
 }
 
 void Texturing::bind() const
@@ -56,12 +88,30 @@ void Texturing::bind() const
 	const Texturing *old = current();
 	if(set_current(this))
 	{
-		for(unsigned i=0; i<attachments.size(); ++i)
-			bind_attachment(i);
 		if(old)
 		{
-			for(unsigned i=attachments.size(); i<old->attachments.size(); ++i)
-				unbind_attachment(i);
+			vector<Attachment>::const_iterator i = attachments.begin();
+			vector<Attachment>::const_iterator j = old->attachments.begin();
+			while(i!=attachments.end() || j!=old->attachments.end())
+			{
+				if(i!=attachments.end() && (j==old->attachments.end() || i->unit<=j->unit))
+				{
+					i->texture->bind_to(i->unit);
+					if(j!=old->attachments.end() && j->unit==i->unit)
+						++j;
+					++i;
+				}
+				else
+				{
+					Texture::unbind_from(j->unit);
+					++j;
+				}
+			}
+		}
+		else
+		{
+			for(vector<Attachment>::const_iterator i=attachments.begin(); i!=attachments.end(); ++i)
+				i->texture->bind_to(i->unit);
 		}
 	}
 }
@@ -71,14 +121,15 @@ void Texturing::unbind()
 	const Texturing *old = current();
 	if(set_current(0))
 	{
-		for(unsigned i=old->attachments.size(); i--;)
-			unbind_attachment(i);
+		for(vector<Attachment>::const_iterator i=old->attachments.begin(); i!=old->attachments.end(); ++i)
+			Texture::unbind_from(i->unit);
 	}
 }
 
 
-Texturing::Attachment::Attachment():
-	tex(0)
+Texturing::Attachment::Attachment(unsigned u, const Texture *t):
+	unit(u),
+	texture(t)
 { }
 
 } // namespace GL