+++ /dev/null
-#ifndef MSP_GL_SAMPLER_H_
-#define MSP_GL_SAMPLER_H_
-
-#include <msp/datafile/objectloader.h>
-#include "gl.h"
-#include "predicate.h"
-
-namespace Msp {
-namespace GL {
-
-enum TextureFilter
-{
- /// No filtering
- NEAREST = GL_NEAREST,
-
- /// Bilinear filtering
- LINEAR = GL_LINEAR,
-
- /// Mipmapping without filtering
- NEAREST_MIPMAP_NEAREST = GL_NEAREST_MIPMAP_NEAREST,
-
- /// 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
-{
- /// 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
-};
-
-class Texture;
-
-
-/**
-Samplers are used to access texture data in shaders. To use a sampler with a
-texture, bind it to the same texture unit. Each texture has a default sampler
-which is used if no external sampler is bound.
-
-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.
-
-If texture coordinates fall outside of the principal range of the texture,
-wrapping is applied. The default for all directions is REPEAT.
-*/
-class Sampler
-{
-public:
- class Loader: public DataFile::ObjectLoader<Sampler>
- {
- public:
- Loader(Sampler &);
- private:
- void init();
-
- void filter(TextureFilter);
- void mag_filter(TextureFilter);
- void max_anisotropy(float);
- void min_filter(TextureFilter);
- void wrap(TextureWrap);
- void wrap_r(TextureWrap);
- void wrap_s(TextureWrap);
- void wrap_t(TextureWrap);
- };
-
-private:
- enum ParameterMask
- {
- MIN_FILTER = 1,
- MAG_FILTER = 2,
- MAX_ANISOTROPY = 4,
- WRAP_S = 8,
- WRAP_T = 16,
- WRAP_R = 32,
- COMPARE = 64
- };
-
- unsigned id;
- const Texture *owner;
- TextureFilter min_filter;
- TextureFilter mag_filter;
- float max_anisotropy;
- TextureWrap wrap_s;
- TextureWrap wrap_t;
- TextureWrap wrap_r;
- bool compare;
- Predicate cmp_func;
- mutable int dirty_params;
-
-public:
- Sampler();
- Sampler(const Texture &);
-private:
- void init();
-
- void update_parameter(int) const;
- void set_parameter_i(unsigned, int) const;
- void set_parameter_f(unsigned, float) const;
-
-public:
- void set_min_filter(TextureFilter);
- void set_mag_filter(TextureFilter);
-
- /** Sets filter for both minification and magnification. If a mipmapping
- filter is specified, LINEAR is used for magnification. */
- void set_filter(TextureFilter);
-
- TextureFilter get_min_filter() const { return min_filter; }
- TextureFilter get_mag_filter() const { return mag_filter; }
-
- void set_max_anisotropy(float);
- float get_max_anisotropy() const { return max_anisotropy; }
-
- /** 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);
-
- /** Disables depth comparison. */
- void disable_compare();
-
- /** Enables depth comparison and sets the compare function. Only has an
- effect when used with a depth texture. When depth 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(Predicate);
-
- bool is_compare_enabled() const { return compare; }
- Predicate get_compare_function() const { return cmp_func; }
-
- void bind() const { bind_to(0); }
- void bind_to(unsigned) const;
-
- static const Sampler *current(unsigned = 0);
- static void unbind() { unbind_from(0); }
- static void unbind_from(unsigned);
-
- void unload();
-};
-
-
-bool is_mipmapped(TextureFilter);
-
-void operator>>(const LexicalConverter &, TextureFilter &);
-void operator>>(const LexicalConverter &, TextureWrap &);
-
-} // namespace GL
-} // namespace Msp
-
-#endif