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#ifndef MPGL_FORMATS_H_
#define MPGL_FORMATS_H_
#include "common.h"
struct gl_format {
GLint internal_format; // glTexImage argument
GLenum format; // glTexImage argument
GLenum type; // e.g. GL_UNSIGNED_SHORT
int flags; // F_* flags
};
enum {
// --- gl_format.flags
// Version flags. If at least 1 flag matches, the format entry is considered
// supported on the current GL context.
F_GL2 = 1 << 0, // GL2.1-only
F_GL3 = 1 << 1, // GL3.0 or later
F_ES2 = 1 << 2, // ES2-only
F_ES3 = 1 << 3, // ES3.0 or later
F_ES32 = 1 << 4, // ES3.2 or later
F_EXT16 = 1 << 5, // ES with GL_EXT_texture_norm16
F_EXTF16 = 1 << 6, // GL_EXT_color_buffer_half_float
F_GL2F = 1 << 7, // GL2.1-only with texture_rg + texture_float + FBOs
F_APPL = 1 << 8, // GL_APPLE_rgb_422
// Feature flags. They are additional and signal presence of features.
F_CR = 1 << 16, // color-renderable
F_TF = 1 << 17, // texture-filterable with GL_LINEAR
F_CF = F_CR | F_TF,
F_F16 = 1 << 18, // uses half-floats (16 bit) internally, even though
// the format is still GL_FLOAT (32 bit)
// --- Other constants.
MPGL_TYPE_UNORM = 1, // normalized integer (fixed point) formats
MPGL_TYPE_UINT = 2, // full integer formats
MPGL_TYPE_FLOAT = 3, // float formats (both full and half)
};
int gl_format_feature_flags(GL *gl);
const struct gl_format *gl_find_internal_format(GL *gl, GLint internal_format);
const struct gl_format *gl_find_special_format(GL *gl, int mpfmt);
const struct gl_format *gl_find_format(GL *gl, int type, int flags,
int bytes_per_component, int n_components);
const struct gl_format *gl_find_unorm_format(GL *gl, int bytes_per_component,
int n_components);
const struct gl_format *gl_find_uint_format(GL *gl, int bytes_per_component,
int n_components);
const struct gl_format *gl_find_float16_format(GL *gl, int n_components);
int gl_format_type(const struct gl_format *format);
bool gl_format_is_regular(const struct gl_format *format);
GLenum gl_integer_format_to_base(GLenum format);
bool gl_is_integer_format(GLenum format);
int gl_component_size(GLenum type);
int gl_format_components(GLenum format);
int gl_bytes_per_pixel(GLenum format, GLenum type);
struct gl_imgfmt_desc {
int num_planes;
const struct gl_format *planes[4];
// Chroma shift (sub-sampling) for each plane.
int xs[4], ys[4];
// Component order (e.g. "rgba"), applied after all planes are combined.
// This has always 4 components (the excess components have no meaning).
// (For GL_LUMINANCE_ALPHA, it is assumed "ra" has been assigned to "rg".)
char swizzle[5];
};
bool gl_get_imgfmt_desc(GL *gl, int imgfmt, struct gl_imgfmt_desc *out);
#endif
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