-/* $Id$
-
-This file is part of libmspgl
-Copyright © 2007 Mikko Rasa, Mikkosoft Productions
-Distributed under the LGPL
-*/
-
#ifndef MSP_GL_TEXTURE_H_
#define MSP_GL_TEXTURE_H_
-#include <istream>
#include <msp/datafile/objectloader.h>
#include "gl.h"
#include "predicate.h"
+#include "resource.h"
namespace Msp {
namespace GL {
enum TextureFilter
{
- NEAREST = GL_NEAREST,
- LINEAR = GL_LINEAR,
+ /// No filtering
+ NEAREST = GL_NEAREST,
+
+ /// Bilinear filtering
+ LINEAR = GL_LINEAR,
+
+ /// Mipmapping without filtering
NEAREST_MIPMAP_NEAREST = GL_NEAREST_MIPMAP_NEAREST,
- NEAREST_MIPMAP_LINEAR = GL_NEAREST_MIPMAP_LINEAR,
- LINEAR_MIPMAP_NEAREST = GL_LINEAR_MIPMAP_NEAREST,
- LINEAR_MIPMAP_LINEAR = GL_LINEAR_MIPMAP_LINEAR
-};
-std::istream &operator>>(std::istream &, TextureFilter &);
+ /// Linear filtering between two mipmap levels
+ NEAREST_MIPMAP_LINEAR = GL_NEAREST_MIPMAP_LINEAR,
+
+ /// Bilinear filtering on the closest mipmap level
+ LINEAR_MIPMAP_NEAREST = GL_LINEAR_MIPMAP_NEAREST,
+
+ /// Trilinear filtering between two mipmap levels
+ LINEAR_MIPMAP_LINEAR = GL_LINEAR_MIPMAP_LINEAR
+};
enum TextureWrap
{
- REPEAT = GL_REPEAT,
- CLAMP_TO_EDGE = GL_CLAMP_TO_EDGE,
+ /// Tile the texture infinitely
+ REPEAT = GL_REPEAT,
+
+ /// Extend the texels at the edge of the texture to infinity
+ CLAMP_TO_EDGE = GL_CLAMP_TO_EDGE,
+
+ /// Tile the texture, with every other repetition mirrored
MIRRORED_REPEAT = GL_MIRRORED_REPEAT
};
Base class for textures. This class only defines operations common for all
texture types and is not instantiable. For specifying images for textures, see
one of the dimensioned texture classes.
+
+A texture is generally rendered at a size that's either smaller or larger than
+its native size, so that the texture coordinates do not exactly correspond to
+the texels of the texture. The kind of filtering used, if any, is determined
+by the minification and magnification filter parameters. The default is LINEAR
+for magnification and NEAREST_MIPMAP_LINEAR for minification.
+
+When a mipmapped filter is in use, the texture consists of a stack of mipmap
+images. Level 0 is the base image. Each level above 0 has half the size of
+the previous level, rounded down and clamped to 1. The level with size 1 in
+all dimensions is the last mipmap level. All levels must be allocated for the
+texture to be usable.
+
+If texture coordinates fall outside of the principal range of the texture,
+wrapping is applied. The default for all directions is REPEAT.
*/
-class Texture
+class Texture: public Resource
{
protected:
- class Loader: public DataFile::ObjectLoader<Texture>
+ class Loader: public DataFile::CollectionObjectLoader<Texture>
{
+ protected:
+ bool srgb;
+
public:
Loader(Texture &);
+ Loader(Texture &, Collection &);
+ private:
+ void init();
+
+ void filter(TextureFilter);
void generate_mipmap(bool);
void mag_filter(TextureFilter);
+ void max_anisotropy(float);
void min_filter(TextureFilter);
void wrap(TextureWrap);
void wrap_r(TextureWrap);
WRAP_R = 16,
GENERATE_MIPMAP = 32,
COMPARE = 64,
- COMPARE_FUNC = 128
+ COMPARE_FUNC = 128,
+ MAX_ANISOTROPY = 256
};
unsigned id;
GLenum target;
TextureFilter min_filter;
TextureFilter mag_filter;
+ float max_anisotropy;
TextureWrap wrap_s;
TextureWrap wrap_t;
TextureWrap wrap_r;
Predicate cmp_func;
mutable int dirty_params;
- Texture(GLenum);
+ Texture(GLenum, ResourceManager * = 0);
Texture(const Texture &);
Texture &operator=(const Texture &);
public:
public:
void set_min_filter(TextureFilter);
void set_mag_filter(TextureFilter);
+
+ /** Sets filter for both minification and magnification. Since mipmapping
+ is not applicable to magnification, LINEAR is used instead. */
+ void set_filter(TextureFilter);
+
+ void set_max_anisotropy(float);
+
+ /** Sets the wrapping mode for all coordinates. */
void set_wrap(TextureWrap);
+
void set_wrap_s(TextureWrap);
void set_wrap_t(TextureWrap);
void set_wrap_r(TextureWrap);
+
+ /** Sets automatic mipmap generation. If enabled, mipmaps are generated
+ when a texture image is uploaded. */
void set_generate_mipmap(bool);
+
+protected:
+ void auto_generate_mipmap();
+
+public:
+ /** Sets depth texture comparison. Has no effect on other formats. When
+ comparison is enabled, the third component of the texture coordinate is
+ compared against the texel value, and the result is returned as the texture
+ sample. */
void set_compare_enabled(bool);
+
+ /** Sets the function to use for depth comparison. */
void set_compare_func(Predicate);
+
GLenum get_target() const { return target; }
unsigned get_id() const { return id; }
- void bind() const;
+ void bind() const { bind_to(0); }
void bind_to(unsigned) const;
- static const Texture *current();
- static void unbind();
+ static const Texture *current(unsigned = 0);
+ static void unbind() { unbind_from(0); }
static void unbind_from(unsigned);
+
+ virtual UInt64 get_data_size() const { return 0; }
};
} // namespace GL
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