Add functions to control environment map updates

[libs/gl.git] / source / pixelstore.cpp

diff --git a/source/pixelstore.cpp b/source/pixelstore.cpp
index c32cf60964a30b43cf7946782fa2c5943231e710..e1a7cc0ef9ea378bce5db24f7035500b00829a36 100644 (file)
--- 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