X-Git-Url: http://git.tdb.fi/?p=libs%2Fgl.git;a=blobdiff_plain;f=source%2Ftexture.cpp;h=18746e5f2ecad265652b12804c2ec927e5d13fcd;hp=b545b16606eaa64a47c2baac3cedd82df39df029;hb=3b159edbe4e80a2bc19c4c2fcd42cb996b9fbfe0;hpb=8f373af3e375799dd739fe932bc697e8595756b4

diff --git a/source/texture.cpp b/source/texture.cpp
index b545b166..18746e5f 100644
--- a/source/texture.cpp
+++ b/source/texture.cpp
@@ -1,5 +1,6 @@
 #include <msp/gl/extensions/arb_direct_state_access.h>
 #include <msp/gl/extensions/arb_shadow.h>
+#include <msp/gl/extensions/arb_texture_swizzle.h>
 #include <msp/gl/extensions/ext_framebuffer_object.h>
 #include <msp/gl/extensions/ext_texture3d.h>
 #include <msp/gl/extensions/ext_texture_filter_anisotropic.h>
@@ -49,6 +50,13 @@ void operator>>(const LexicalConverter &c, TextureWrap &tw)
 }
 
 
+int Texture::swizzle_orders[] =
+{
+	GL_RED, GL_GREEN, GL_BLUE, GL_ALPHA,
+	GL_RED, GL_RED, GL_RED, GL_ONE,
+	GL_RED, GL_RED, GL_RED, GL_GREEN
+};
+
 Texture::Texture(GLenum t, ResourceManager *m):
 	id(0),
 	target(t),
@@ -93,8 +101,34 @@ void Texture::set_internal_format(PixelFormat fmt)
 		fmt = get_sized_pixelformat(fmt, size);
 	}
 
+	FormatSwizzle swiz = NO_SWIZZLE;
+	if(ARB_texture_rg && ARB_texture_swizzle)
+	{
+		if(fmt==LUMINANCE8 || fmt==SLUMINANCE8)
+		{
+			fmt = R8;
+			swiz = R_TO_LUMINANCE;
+		}
+		else if(fmt==LUMINANCE8_ALPHA8 || fmt==SLUMINANCE8_ALPHA8)
+		{
+			fmt = RG8;
+			swiz = RG_TO_LUMINANCE_ALPHA;
+		}
+	}
+
 	require_pixelformat(fmt);
 	ifmt = fmt;
+	swizzle = swiz;
+	if(swizzle)
+		update_parameter(FORMAT_SWIZZLE);
+}
+
+PixelFormat Texture::get_upload_format(PixelFormat fmt) const
+{
+	if(fmt==LUMINANCE || fmt==LUMINANCE_ALPHA)
+		return get_base_pixelformat(ifmt);
+	else
+		return fmt;
 }
 
 void Texture::update_parameter(int mask) const
@@ -129,6 +163,13 @@ void Texture::update_parameter(int mask) const
 		set_parameter_i(GL_TEXTURE_COMPARE_MODE, (compare ? GL_COMPARE_R_TO_TEXTURE : GL_NONE));
 	if(mask&COMPARE_FUNC)
 		set_parameter_i(GL_TEXTURE_COMPARE_FUNC, cmp_func);
+	if(mask&FORMAT_SWIZZLE)
+	{
+		if(ARB_direct_state_access)
+			glTextureParameteriv(id, GL_TEXTURE_SWIZZLE_RGBA, swizzle_orders+swizzle*4);
+		else
+			glTexParameteriv(target, GL_TEXTURE_SWIZZLE_RGBA, swizzle_orders+swizzle*4);
+	}
 }
 
 void Texture::set_parameter_i(GLenum param, int value) const