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alexsr/gl_texture_format_util.hpp

Created July 4, 2018 20:24
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OpenGL internal texture format conversion
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gl_texture_format_util.hpp
enum class format : GLenum {
r = GL_RED,
g = GL_GREEN,
b = GL_BLUE,
rg = GL_RG,
rgb = GL_RGB,
bgr = GL_BGR,
rgba = GL_RGBA,
bgra = GL_BGRA,
r_int = GL_RED_INTEGER,
g_int = GL_GREEN_INTEGER,
b_int = GL_BLUE_INTEGER,
rg_int = GL_RG_INTEGER,
rgb_int = GL_RGB_INTEGER,
bgr_int = GL_BGR_INTEGER,
rgba_int = GL_RGBA_INTEGER,
bgra_int = GL_BGRA_INTEGER,
depth = GL_DEPTH_COMPONENT,
stencil = GL_STENCIL_INDEX,
depth_stencil = GL_DEPTH_STENCIL
};
enum class type : GLenum {
ubyte = GL_UNSIGNED_BYTE,
byte = GL_BYTE,
ushort = GL_UNSIGNED_SHORT,
s = GL_SHORT,
uint = GL_UNSIGNED_INT,
i = GL_INT,
half_f = GL_HALF_FLOAT,
f = GL_FLOAT,
ubyte_3_3_2 = GL_UNSIGNED_BYTE_3_3_2,
ubyte_2_3_3_r = GL_UNSIGNED_BYTE_2_3_3_REV,
ushort_5_6_5 = GL_UNSIGNED_SHORT_5_6_5,
ushort_5_6_5_r = GL_UNSIGNED_SHORT_5_6_5_REV,
ushort_4_4_4_4 = GL_UNSIGNED_SHORT_4_4_4_4,
ushort_4_4_4_4_r = GL_UNSIGNED_SHORT_4_4_4_4_REV,
ushort_5_5_5_1 = GL_UNSIGNED_SHORT_5_5_5_1,
ushort_1_5_5_5_r = GL_UNSIGNED_SHORT_1_5_5_5_REV,
uint_8_8_8_8 = GL_UNSIGNED_INT_8_8_8_8,
uint_8_8_8_8_r = GL_UNSIGNED_INT_8_8_8_8_REV,
uint_10_10_10_2 = GL_UNSIGNED_INT_10_10_10_2,
uint_2_10_10_10_r = GL_UNSIGNED_INT_2_10_10_10_REV,
uint_24_8 = GL_UNSIGNED_INT_24_8,
uint_10f_11f_11f_r = GL_UNSIGNED_INT_10F_11F_11F_REV,
uint_5_9_9_9_r = GL_UNSIGNED_INT_5_9_9_9_REV,
f32_uint_24_8_r = GL_FLOAT_32_UNSIGNED_INT_24_8_REV
};
enum class intern {
r8 = GL_R8,
r8_n = GL_R8_SNORM,
r16 = GL_R16,
r16_n = GL_R16_SNORM,
r8i = GL_R8I,
r8ui = GL_R8UI,
r16i = GL_R16I,
r16ui = GL_R16UI,
r32i = GL_R32I,
r32ui = GL_R32UI,
r16f = GL_R16F,
r32f = GL_R32F,
rg8 = GL_RG8,
rg8_n = GL_RG8_SNORM,
rg16 = GL_RG16,
rg16_n = GL_RG16_SNORM,
rg8i = GL_RG8I,
rg8ui = GL_RG8UI,
rg16i = GL_RG16I,
rg16ui = GL_RG16UI,
rg32i = GL_RG32I,
rg32ui = GL_RG32UI,
rg16f = GL_RG16F,
rg32f = GL_RG32F,
r3_g3_b2 = GL_R3_G3_B2,
rgb4 = GL_RGB4,
rgb5 = GL_RGB5,
rgb565 = GL_RGB565,
rgb8 = GL_RGB8,
rgb8_n = GL_RGB8_SNORM,
rgb10 = GL_RGB10,
rgb12 = GL_RGB12,
rgb16 = GL_RGB16,
rgb16_n = GL_RGB16_SNORM,
srgb8 = GL_SRGB8,
r11f_g11f_b10f = GL_R11F_G11F_B10F,
rgb9_e5 = GL_RGB9_E5,
rgb8i = GL_RGB8I,
rgb8ui = GL_RGB8UI,
rgb16i = GL_RGB16I,
rgb16ui = GL_RGB16UI,
rgb32i = GL_RGB32I,
rgb32ui = GL_RGB32UI,
rgb16f = GL_RGB16F,
rgb32f = GL_RGB32F,
rgba2 = GL_RGBA2,
rgba4 = GL_RGBA4,
rgb5_a1 = GL_RGB5_A1,
rgba8 = GL_RGBA8,
rgba8_n = GL_RGBA8_SNORM,
rgb10_a2 = GL_RGB10_A2,
rgb10_a2ui = GL_RGB10_A2UI,
rgba12 = GL_RGBA12,
rgba16 = GL_RGBA16,
rgba16_n = GL_RGBA16_SNORM,
srgb8_a8 = GL_SRGB8_ALPHA8,
rgba8i = GL_RGBA8I,
rgba8ui = GL_RGBA8UI,
rgba16i = GL_RGBA16I,
rgba16ui = GL_RGBA16UI,
rgba32i = GL_RGBA32I,
rgba32ui = GL_RGBA32UI,
rgba16f = GL_RGBA16F,
rgba32f = GL_RGBA32F,
depth16 = GL_DEPTH_COMPONENT16,
depth24 = GL_DEPTH_COMPONENT24,
depth32 = GL_DEPTH_COMPONENT32,
depth32f = GL_DEPTH_COMPONENT32F,
stencil1 = GL_STENCIL_INDEX1,
stencil4 = GL_STENCIL_INDEX4,
stencil8 = GL_STENCIL_INDEX8,
stencil16 = GL_STENCIL_INDEX16,
depth24_stencil8 = GL_DEPTH24_STENCIL8,
depth32f_stencil8 = GL_DEPTH32F_STENCIL8
};
constexpr format to_format(const intern internal_format) {
switch (internal_format) {
case intern::r8:
case intern::r8_n:
case intern::r16:
case intern::r16_n:
case intern::r16f:
case intern::r32f:
return format::r;
case intern::r8i:
case intern::r8ui:
case intern::r16i:
case intern::r16ui:
case intern::r32i:
case intern::r32ui:
return format::r_int;
case intern::rg8:
case intern::rg8_n:
case intern::rg16:
case intern::rg16_n:
case intern::rg16f:
case intern::rg32f:
return format::rg;
case intern::rg8i:
case intern::rg8ui:
case intern::rg16i:
case intern::rg16ui:
case intern::rg32i:
case intern::rg32ui:
return format::rg_int;
case intern::r3_g3_b2:
case intern::rgb4:
case intern::rgb5:
case intern::rgb565:
case intern::rgb8:
case intern::rgb8_n:
case intern::rgb10:
case intern::rgb12:
case intern::rgb16:
case intern::rgb16_n:
case intern::srgb8:
case intern::r11f_g11f_b10f:
case intern::rgb9_e5:
case intern::rgb16f:
case intern::rgb32f:
return format::rgb;
case intern::rgb8i:
case intern::rgb8ui:
case intern::rgb16i:
case intern::rgb16ui:
case intern::rgb32i:
case intern::rgb32ui:
return format::rgb_int;
case intern::rgba2:
case intern::rgba4:
case intern::rgb5_a1:
case intern::rgba8:
case intern::rgba8_n:
case intern::rgb10_a2:
case intern::rgba12:
case intern::rgba16:
case intern::rgba16_n:
case intern::srgb8_a8:
case intern::rgba16f:
case intern::rgba32f:
return format::rgba;
case intern::rgb10_a2ui:
case intern::rgba8i:
case intern::rgba8ui:
case intern::rgba16i:
case intern::rgba16ui:
case intern::rgba32i:
case intern::rgba32ui:
return format::rgba_int;
case intern::depth16:
case intern::depth24:
case intern::depth32:
case intern::depth32f:
return format::depth;
case intern::stencil1:
case intern::stencil4:
case intern::stencil8:
case intern::stencil16:
return format::stencil;
case intern::depth24_stencil8:
case intern::depth32f_stencil8:
return format::depth_stencil;
default:
return format::rgba;
}
}
constexpr type to_type(const intern internal_format) {
switch (internal_format) {
case intern::r8:
case intern::r8ui:
case intern::rg8:
case intern::rg8ui:
case intern::rgb8:
case intern::rgb8ui:
case intern::rgba8:
case intern::rgba8ui:
case intern::srgb8:
case intern::srgb8_a8:
case intern::stencil8:
return type::ubyte;
case intern::r8i:
case intern::r8_n:
case intern::rg8i:
case intern::rg8_n:
case intern::rgb8i:
case intern::rgb8_n:
case intern::rgba8i:
case intern::rgba8_n:
return type::byte;
case intern::r16:
case intern::r16ui:
case intern::rg16:
case intern::rg16ui:
case intern::rgb16:
case intern::rgb16ui:
case intern::rgba16:
case intern::rgba16ui:
case intern::depth16:
case intern::stencil16:
return type::ushort;
case intern::r16i:
case intern::r16_n:
case intern::rg16i:
case intern::rg16_n:
case intern::rgb16i:
case intern::rgb16_n:
case intern::rgba16i:
case intern::rgba16_n:
return type::s;
case intern::r32ui:
case intern::rg32ui:
case intern::rgb32ui:
case intern::rgba32ui:
case intern::depth32:
return type::uint;
case intern::r32i:
case intern::rg32i:
case intern::rgb32i:
case intern::rgba32i:
return type::i;
case intern::r16f:
case intern::rg16f:
case intern::rgb16f:
case intern::rgba16f:
return type::half_f;
case intern::r32f:
case intern::rg32f:
case intern::rgb32f:
case intern::rgba32f:
case intern::depth32f:
return type::f;
case intern::r11f_g11f_b10f:
return type::uint_10f_11f_11f_r;
case intern::r3_g3_b2:
return type::ubyte_2_3_3_r;
case intern::rgba4:
return type::ushort_4_4_4_4_r;
case intern::rgb565:
return type::ushort_5_6_5_r;
case intern::rgb9_e5:
return type::uint_5_9_9_9_r;
case intern::rgb5_a1:
return type::ushort_1_5_5_5_r;
case intern::rgb10_a2:
case intern::rgb10_a2ui:
return type::uint_2_10_10_10_r;
case intern::depth24_stencil8:
return type::uint_24_8;
case intern::depth32f_stencil8:
return type::f32_uint_24_8_r;
case intern::depth24:
case intern::stencil1:
case intern::stencil4:
case intern::rgb4:
case intern::rgb5:
case intern::rgb10:
case intern::rgb12:
case intern::rgba2:
case intern::rgba12:
throw std::exception{"These types cannot be deduced."};
default:
return type::f;
}
}
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