X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Ftexturecube.h;h=077b58ac59f48d6e1bc688564b9787a5086d5b28;hb=a1eb8711ba225bb4423868c50369ad5592465171;hp=b15c1cff2af5fcff564d6f70e754b0282d4ff4fe;hpb=e003d7a1497dad3b13e4e88e681f8fa2afc40c83;p=libs%2Fgl.git

diff --git a/source/texturecube.h b/source/texturecube.h
index b15c1cff..077b58ac 100644
--- a/source/texturecube.h
+++ b/source/texturecube.h
@@ -1,9 +1,12 @@
 #ifndef MSP_GL_TEXTURECUBE_H_
 #define MSP_GL_TEXTURECUBE_H_
 
+#include <msp/graphics/image.h>
 #include "datatype.h"
 #include "pixelformat.h"
 #include "texture.h"
+#include "vector.h"
+#include <msp/gl/extensions/arb_texture_cube_map.h>
 
 namespace Msp {
 namespace GL {
@@ -23,7 +26,8 @@ Cube map texture, consisting of six square faces.  All of the faces must be of
 the same size.  A cube map texture is addressed by three-dimensional texture
 coordinates, with a principal range of [-1, 1].  The face is first selected
 according to the largest coordinate, and the remaining two coordinates are used
-to sample the face image.
+to sample the face image.  The images are oriented so that the cross product of
+the s and t axes will point into the cube.
 
 All faces of a cube map texture must be allocated for it to be usable.
 
@@ -31,11 +35,27 @@ Requires OpenGL version 1.3.
 */
 class TextureCube: public Texture
 {
+public:
+	class Loader: public Msp::DataFile::DerivedObjectLoader<TextureCube, Texture::Loader>
+	{
+	public:
+		Loader(TextureCube &);
+		Loader(TextureCube &, Collection &);
+	private:
+		void init();
+
+		void image_data(TextureCubeFace, const std::string &);
+		void raw_data(TextureCubeFace, const std::string &);
+		void storage(PixelFormat, unsigned);
+	};
+
 private:
 	PixelFormat ifmt;
 	unsigned size;
 	unsigned allocated;
 
+	static Vector3 directions[6];
+
 public:
 	TextureCube();
 
@@ -60,11 +80,32 @@ public:
 		int x, int y, unsigned w, unsigned h,
 		PixelFormat fmt, DataType type, const void *data);
 
+	void image(TextureCubeFace, const Graphics::Image &, bool = false);
+
 	unsigned get_size() const { return size; }
 private:
 	unsigned get_level_size(unsigned);
+
+public:
+	/** Translates indices into face constants.  Valid indices are between 0
+	and 5, inclusive. */
+	static TextureCubeFace enumerate_faces(unsigned);
+
+	/** Returns a vector pointing out of the face. */
+	static const Vector3 &get_face_direction(TextureCubeFace);
+
+	/** Returns a vector in the direction of the s axis of the face. */
+	static const Vector3 &get_s_direction(TextureCubeFace);
+
+	/** Returns a vector in the direction of the t axis of the face. */
+	static const Vector3 &get_t_direction(TextureCubeFace);
+
+	/** Returns a vector pointing to the center a texel. */
+	Vector3 get_texel_direction(TextureCubeFace, unsigned, unsigned);
 };
 
+void operator>>(const LexicalConverter &, TextureCubeFace &);
+
 } // namespace GL
 } // namespace Msp