X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Fcore%2Fpixelstore.cpp;fp=source%2Fcore%2Fpixelstore.cpp;h=409f0f9a862e3582c975a486188452a60544dfb6;hb=7aaec9a70b8d7733429bec043f8e33e02956f266;hp=0000000000000000000000000000000000000000;hpb=bec07999d95b76f4b47cffcc564d0cd0afc0435e;p=libs%2Fgl.git

diff --git a/source/core/pixelstore.cpp b/source/core/pixelstore.cpp
new file mode 100644
index 00000000..409f0f9a
--- /dev/null
+++ b/source/core/pixelstore.cpp
@@ -0,0 +1,86 @@
+#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"
+
+using namespace std;
+
+namespace Msp {
+namespace GL {
+
+PixelStore::PixelStore():
+	row_length(0),
+	image_height(0),
+	skip_pixels(0),
+	skip_rows(0),
+	skip_images(0),
+	alignment(4)
+{ }
+
+PixelStore PixelStore::from_image(const Graphics::Image &img)
+{
+	PixelStore pstore;
+	unsigned stride = img.get_stride();
+	unsigned ncomp = get_component_count(pixelformat_from_image(img));
+	pstore.set_canvas_size(img.get_stride()/ncomp, 0);
+	pstore.set_alignment(min(stride&~(stride-1), 8U));
+	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))
+		update_parameter(-1);
+}
+
+} // namespace GL
+} // namespace Msp