Added the start of support for NPOT textures

panda/src/display/graphicsStateGuardian.I

@@ -345,6 +345,17 @@ get_supports_cube_map() const {
   return _supports_cube_map;
 }
 
+////////////////////////////////////////////////////////////////////
+//     Function: GraphicsStateGuardian::get_supports_tex_non_pow2
+//       Access: Published
+//  Description: Returns true if this GSG can handle non power of two
+//               sized textures.
+////////////////////////////////////////////////////////////////////
+INLINE bool GraphicsStateGuardian::
+get_supports_tex_non_pow2() const {
+  return _supports_tex_non_pow2;
+}
+
 ////////////////////////////////////////////////////////////////////
 //     Function: GraphicsStateGuardian::get_max_lights
 //       Access: Published

panda/src/display/graphicsStateGuardian.cxx

@@ -132,7 +132,8 @@ GraphicsStateGuardian(const FrameBufferProperties &properties,
 
   _supports_3d_texture = false;
   _supports_cube_map = false;
-
+  _supports_tex_non_pow2 = false;
+  
   // Assume no limits on number of lights or clip planes.
   _max_lights = -1;
   _max_clip_planes = -1;

panda/src/display/graphicsStateGuardian.h

@@ -96,6 +96,7 @@ PUBLISHED:
 
   INLINE bool get_supports_3d_texture() const;
   INLINE bool get_supports_cube_map() const;
+  INLINE bool get_supports_tex_non_pow2() const;
 
   INLINE int get_max_lights() const;
   INLINE int get_max_clip_planes() const;
@@ -336,6 +337,7 @@ protected:
 
   bool _supports_3d_texture;
   bool _supports_cube_map;
+  bool _supports_tex_non_pow2;
 
   int _max_lights;
   int _max_clip_planes;

panda/src/glstuff/glGraphicsStateGuardian_src.cxx

@@ -472,6 +472,9 @@ reset() {
 
   _supports_multitexture = false;
 
+  _supports_tex_non_pow2 =
+    has_extension("GL_ARB_texture_non_power_of_two");
+  
   if (is_at_least_version(1, 3)) {
     _supports_multitexture = true;
 
@@ -2443,9 +2446,14 @@ framebuffer_copy_to_texture(Texture *tex, int z, const DisplayRegion *dr,
 
   int xo, yo, w, h;
   dr->get_region_pixels(xo, yo, w, h);
-  tex->set_x_size(Texture::up_to_power_2(w));
-  tex->set_y_size(Texture::up_to_power_2(h));
-
+  if (_supports_tex_non_pow2) {
+    tex->set_x_size(w);
+    tex->set_y_size(h);
+  } else {
+    tex->set_x_size(Texture::up_to_power_2(w));
+    tex->set_y_size(Texture::up_to_power_2(h));
+  }
+  
   // Sanity check everything.
   if (z >= 0) {
     if (!_supports_cube_map) {