X-Git-Url: http://git.tdb.fi/?p=libs%2Fgl.git;a=blobdiff_plain;f=source%2Fpixelstore.cpp;h=e1a7cc0ef9ea378bce5db24f7035500b00829a36;hp=c32cf60964a30b43cf7946782fa2c5943231e710;hb=4598d28936d3a4772927d1e3a1534f872731b358;hpb=055f553b1a75f44e72f3c2b5a1c98c1e1e8f3f30

diff --git a/source/pixelstore.cpp b/source/pixelstore.cpp
index c32cf609..e1a7cc0e 100644
--- a/source/pixelstore.cpp
+++ b/source/pixelstore.cpp
@@ -1,4 +1,6 @@
 #include <algorithm>
+#include <msp/gl/extensions/ext_texture3d.h>
+#include <msp/gl/extensions/ext_unpack_subimage.h>
 #include "gl.h"
 #include "pixelformat.h"
 #include "pixelstore.h"
@@ -27,35 +29,57 @@ PixelStore PixelStore::from_image(const Graphics::Image &img)
 	return pstore;
 }
 
+void PixelStore::update_parameter(int mask) const
+{
+	if(cur_obj!=this)
+		return;
+
+	if(mask&SIZE)
+	{
+		glPixelStorei(GL_UNPACK_ROW_LENGTH, row_length);
+		if(EXT_texture3D)
+			glPixelStorei(GL_UNPACK_IMAGE_HEIGHT, image_height);
+	}
+	if(mask&ORIGIN)
+	{
+		glPixelStorei(GL_UNPACK_SKIP_PIXELS, skip_pixels);
+		glPixelStorei(GL_UNPACK_SKIP_ROWS, skip_rows);
+		if(EXT_texture3D)
+			glPixelStorei(GL_UNPACK_SKIP_IMAGES, skip_images);
+	}
+	if(mask&ALIGNMENT)
+		glPixelStorei(GL_UNPACK_ALIGNMENT, alignment);
+}
+
 void PixelStore::set_canvas_size(unsigned w, unsigned h)
 {
+	static Require _req(EXT_unpack_subimage);
 	row_length = w;
 	image_height = h;
+	update_parameter(SIZE);
 }
 
 void PixelStore::set_origin(unsigned x, unsigned y, unsigned z)
 {
+	static Require _req(EXT_unpack_subimage);
+	if(z>0)
+		static Require _req3d(EXT_texture3D);
 	skip_pixels = x;
 	skip_rows = y;
 	skip_images = z;
+	update_parameter(ORIGIN);
 }
 
 void PixelStore::set_alignment(unsigned a)
 {
 	alignment = a;
+	update_parameter(ALIGNMENT);
 }
 
 void PixelStore::bind() const
 {
 	if(set_current(this))
-	{
-		glPixelStorei(GL_UNPACK_ROW_LENGTH, row_length);
-		glPixelStorei(GL_UNPACK_IMAGE_HEIGHT, image_height);
-		glPixelStorei(GL_UNPACK_SKIP_PIXELS, skip_pixels);
-		glPixelStorei(GL_UNPACK_SKIP_ROWS, skip_rows);
-		glPixelStorei(GL_UNPACK_SKIP_IMAGES, skip_images);
-		glPixelStorei(GL_UNPACK_ALIGNMENT, alignment);
-	}
+		update_parameter(-1);
 }
 
 } // namespace GL