434 lines
15 KiB
C
434 lines
15 KiB
C
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/**
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@mainpage SOIL
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Jonathan Dummer
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2007-07-26-10.36
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Simple OpenGL Image Library
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A tiny c library for uploading images as
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textures into OpenGL. Also saving and
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loading of images is supported.
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I'm using Sean's Tool Box image loader as a base:
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http://www.nothings.org/
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I'm upgrading it to load TGA and DDS files, and a direct
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path for loading DDS files straight into OpenGL textures,
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when applicable.
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Image Formats:
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- BMP load & save
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- TGA load & save
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- DDS load & save
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- PNG load
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- JPG load
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OpenGL Texture Features:
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- resample to power-of-two sizes
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- MIPmap generation
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- compressed texture S3TC formats (if supported)
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- can pre-multiply alpha for you, for better compositing
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- can flip image about the y-axis (except pre-compressed DDS files)
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Thanks to:
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* Sean Barret - for the awesome stb_image
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* Dan Venkitachalam - for finding some non-compliant DDS files, and patching some explicit casts
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* everybody at gamedev.net
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**/
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#ifndef HEADER_SIMPLE_OPENGL_IMAGE_LIBRARY
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#define HEADER_SIMPLE_OPENGL_IMAGE_LIBRARY
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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The format of images that may be loaded (force_channels).
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SOIL_LOAD_AUTO leaves the image in whatever format it was found.
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SOIL_LOAD_L forces the image to load as Luminous (greyscale)
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SOIL_LOAD_LA forces the image to load as Luminous with Alpha
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SOIL_LOAD_RGB forces the image to load as Red Green Blue
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SOIL_LOAD_RGBA forces the image to load as Red Green Blue Alpha
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**/
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enum
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{
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SOIL_LOAD_AUTO = 0,
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SOIL_LOAD_L = 1,
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SOIL_LOAD_LA = 2,
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SOIL_LOAD_RGB = 3,
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SOIL_LOAD_RGBA = 4
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};
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/**
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Passed in as reuse_texture_ID, will cause SOIL to
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register a new texture ID using glGenTextures().
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If the value passed into reuse_texture_ID > 0 then
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SOIL will just re-use that texture ID (great for
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reloading image assets in-game!)
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**/
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enum
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{
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SOIL_CREATE_NEW_ID = 0
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};
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/**
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flags you can pass into SOIL_load_OGL_texture()
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and SOIL_create_OGL_texture().
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(note that if SOIL_FLAG_DDS_LOAD_DIRECT is used
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the rest of the flags with the exception of
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SOIL_FLAG_TEXTURE_REPEATS will be ignored while
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loading already-compressed DDS files.)
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SOIL_FLAG_POWER_OF_TWO: force the image to be POT
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SOIL_FLAG_MIPMAPS: generate mipmaps for the texture
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SOIL_FLAG_TEXTURE_REPEATS: otherwise will clamp
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SOIL_FLAG_MULTIPLY_ALPHA: for using (GL_ONE,GL_ONE_MINUS_SRC_ALPHA) blending
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SOIL_FLAG_INVERT_Y: flip the image vertically
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SOIL_FLAG_COMPRESS_TO_DXT: if the card can display them, will convert RGB to DXT1, RGBA to DXT5
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SOIL_FLAG_DDS_LOAD_DIRECT: will load DDS files directly without _ANY_ additional processing
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SOIL_FLAG_NTSC_SAFE_RGB: clamps RGB components to the range [16,235]
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SOIL_FLAG_CoCg_Y: Google YCoCg; RGB=>CoYCg, RGBA=>CoCgAY
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SOIL_FLAG_TEXTURE_RECTANGE: uses ARB_texture_rectangle ; pixel indexed & no repeat or MIPmaps or cubemaps
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**/
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enum
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{
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SOIL_FLAG_POWER_OF_TWO = 1,
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SOIL_FLAG_MIPMAPS = 2,
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SOIL_FLAG_TEXTURE_REPEATS = 4,
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SOIL_FLAG_MULTIPLY_ALPHA = 8,
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SOIL_FLAG_INVERT_Y = 16,
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SOIL_FLAG_COMPRESS_TO_DXT = 32,
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SOIL_FLAG_DDS_LOAD_DIRECT = 64,
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SOIL_FLAG_NTSC_SAFE_RGB = 128,
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SOIL_FLAG_CoCg_Y = 256,
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SOIL_FLAG_TEXTURE_RECTANGLE = 512
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};
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/**
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The types of images that may be saved.
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(TGA supports uncompressed RGB / RGBA)
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(BMP supports uncompressed RGB)
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(DDS supports DXT1 and DXT5)
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**/
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enum
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{
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SOIL_SAVE_TYPE_TGA = 0,
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SOIL_SAVE_TYPE_BMP = 1,
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SOIL_SAVE_TYPE_DDS = 2
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};
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/**
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Defines the order of faces in a DDS cubemap.
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I recommend that you use the same order in single
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image cubemap files, so they will be interchangeable
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with DDS cubemaps when using SOIL.
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**/
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#define SOIL_DDS_CUBEMAP_FACE_ORDER "EWUDNS"
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/**
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The types of internal fake HDR representations
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SOIL_HDR_RGBE: RGB * pow( 2.0, A - 128.0 )
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SOIL_HDR_RGBdivA: RGB / A
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SOIL_HDR_RGBdivA2: RGB / (A*A)
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**/
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enum
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{
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SOIL_HDR_RGBE = 0,
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SOIL_HDR_RGBdivA = 1,
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SOIL_HDR_RGBdivA2 = 2
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};
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/**
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Loads an image from disk into an OpenGL texture.
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\param filename the name of the file to upload as a texture
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\param force_channels 0-image format, 1-luminous, 2-luminous/alpha, 3-RGB, 4-RGBA
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\param reuse_texture_ID 0-generate a new texture ID, otherwise reuse the texture ID (overwriting the old texture)
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\param flags can be any of SOIL_FLAG_POWER_OF_TWO | SOIL_FLAG_MIPMAPS | SOIL_FLAG_TEXTURE_REPEATS | SOIL_FLAG_MULTIPLY_ALPHA | SOIL_FLAG_INVERT_Y | SOIL_FLAG_COMPRESS_TO_DXT | SOIL_FLAG_DDS_LOAD_DIRECT
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\return 0-failed, otherwise returns the OpenGL texture handle
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**/
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unsigned int
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SOIL_load_OGL_texture
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(
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const char *filename,
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int force_channels,
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unsigned int reuse_texture_ID,
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unsigned int flags
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);
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/**
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Loads 6 images from disk into an OpenGL cubemap texture.
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\param x_pos_file the name of the file to upload as the +x cube face
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\param x_neg_file the name of the file to upload as the -x cube face
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\param y_pos_file the name of the file to upload as the +y cube face
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\param y_neg_file the name of the file to upload as the -y cube face
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\param z_pos_file the name of the file to upload as the +z cube face
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\param z_neg_file the name of the file to upload as the -z cube face
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\param force_channels 0-image format, 1-luminous, 2-luminous/alpha, 3-RGB, 4-RGBA
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\param reuse_texture_ID 0-generate a new texture ID, otherwise reuse the texture ID (overwriting the old texture)
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\param flags can be any of SOIL_FLAG_POWER_OF_TWO | SOIL_FLAG_MIPMAPS | SOIL_FLAG_TEXTURE_REPEATS | SOIL_FLAG_MULTIPLY_ALPHA | SOIL_FLAG_INVERT_Y | SOIL_FLAG_COMPRESS_TO_DXT | SOIL_FLAG_DDS_LOAD_DIRECT
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\return 0-failed, otherwise returns the OpenGL texture handle
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**/
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unsigned int
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SOIL_load_OGL_cubemap
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(
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const char *x_pos_file,
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const char *x_neg_file,
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const char *y_pos_file,
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const char *y_neg_file,
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const char *z_pos_file,
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const char *z_neg_file,
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int force_channels,
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unsigned int reuse_texture_ID,
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unsigned int flags
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);
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/**
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Loads 1 image from disk and splits it into an OpenGL cubemap texture.
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\param filename the name of the file to upload as a texture
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\param face_order the order of the faces in the file, any combination of NSWEUD, for North, South, Up, etc.
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\param force_channels 0-image format, 1-luminous, 2-luminous/alpha, 3-RGB, 4-RGBA
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\param reuse_texture_ID 0-generate a new texture ID, otherwise reuse the texture ID (overwriting the old texture)
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\param flags can be any of SOIL_FLAG_POWER_OF_TWO | SOIL_FLAG_MIPMAPS | SOIL_FLAG_TEXTURE_REPEATS | SOIL_FLAG_MULTIPLY_ALPHA | SOIL_FLAG_INVERT_Y | SOIL_FLAG_COMPRESS_TO_DXT | SOIL_FLAG_DDS_LOAD_DIRECT
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\return 0-failed, otherwise returns the OpenGL texture handle
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**/
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unsigned int
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SOIL_load_OGL_single_cubemap
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(
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const char *filename,
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const char face_order[6],
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int force_channels,
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unsigned int reuse_texture_ID,
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unsigned int flags
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);
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/**
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Loads an HDR image from disk into an OpenGL texture.
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\param filename the name of the file to upload as a texture
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\param fake_HDR_format SOIL_HDR_RGBE, SOIL_HDR_RGBdivA, SOIL_HDR_RGBdivA2
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\param reuse_texture_ID 0-generate a new texture ID, otherwise reuse the texture ID (overwriting the old texture)
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\param flags can be any of SOIL_FLAG_POWER_OF_TWO | SOIL_FLAG_MIPMAPS | SOIL_FLAG_TEXTURE_REPEATS | SOIL_FLAG_MULTIPLY_ALPHA | SOIL_FLAG_INVERT_Y | SOIL_FLAG_COMPRESS_TO_DXT
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\return 0-failed, otherwise returns the OpenGL texture handle
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**/
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unsigned int
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SOIL_load_OGL_HDR_texture
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(
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const char *filename,
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int fake_HDR_format,
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int rescale_to_max,
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unsigned int reuse_texture_ID,
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unsigned int flags
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);
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/**
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Loads an image from RAM into an OpenGL texture.
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\param buffer the image data in RAM just as if it were still in a file
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\param buffer_length the size of the buffer in bytes
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\param force_channels 0-image format, 1-luminous, 2-luminous/alpha, 3-RGB, 4-RGBA
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\param reuse_texture_ID 0-generate a new texture ID, otherwise reuse the texture ID (overwriting the old texture)
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\param flags can be any of SOIL_FLAG_POWER_OF_TWO | SOIL_FLAG_MIPMAPS | SOIL_FLAG_TEXTURE_REPEATS | SOIL_FLAG_MULTIPLY_ALPHA | SOIL_FLAG_INVERT_Y | SOIL_FLAG_COMPRESS_TO_DXT | SOIL_FLAG_DDS_LOAD_DIRECT
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\return 0-failed, otherwise returns the OpenGL texture handle
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**/
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unsigned int
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SOIL_load_OGL_texture_from_memory
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(
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const unsigned char *const buffer,
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int buffer_length,
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int force_channels,
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unsigned int reuse_texture_ID,
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unsigned int flags
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);
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/**
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Loads 6 images from memory into an OpenGL cubemap texture.
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\param x_pos_buffer the image data in RAM to upload as the +x cube face
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\param x_pos_buffer_length the size of the above buffer
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\param x_neg_buffer the image data in RAM to upload as the +x cube face
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\param x_neg_buffer_length the size of the above buffer
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\param y_pos_buffer the image data in RAM to upload as the +x cube face
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\param y_pos_buffer_length the size of the above buffer
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\param y_neg_buffer the image data in RAM to upload as the +x cube face
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\param y_neg_buffer_length the size of the above buffer
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\param z_pos_buffer the image data in RAM to upload as the +x cube face
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\param z_pos_buffer_length the size of the above buffer
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\param z_neg_buffer the image data in RAM to upload as the +x cube face
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\param z_neg_buffer_length the size of the above buffer
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\param force_channels 0-image format, 1-luminous, 2-luminous/alpha, 3-RGB, 4-RGBA
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\param reuse_texture_ID 0-generate a new texture ID, otherwise reuse the texture ID (overwriting the old texture)
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\param flags can be any of SOIL_FLAG_POWER_OF_TWO | SOIL_FLAG_MIPMAPS | SOIL_FLAG_TEXTURE_REPEATS | SOIL_FLAG_MULTIPLY_ALPHA | SOIL_FLAG_INVERT_Y | SOIL_FLAG_COMPRESS_TO_DXT | SOIL_FLAG_DDS_LOAD_DIRECT
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\return 0-failed, otherwise returns the OpenGL texture handle
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**/
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unsigned int
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SOIL_load_OGL_cubemap_from_memory
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(
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const unsigned char *const x_pos_buffer,
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int x_pos_buffer_length,
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const unsigned char *const x_neg_buffer,
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int x_neg_buffer_length,
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const unsigned char *const y_pos_buffer,
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int y_pos_buffer_length,
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const unsigned char *const y_neg_buffer,
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int y_neg_buffer_length,
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const unsigned char *const z_pos_buffer,
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int z_pos_buffer_length,
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const unsigned char *const z_neg_buffer,
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int z_neg_buffer_length,
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int force_channels,
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unsigned int reuse_texture_ID,
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unsigned int flags
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);
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/**
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Loads 1 image from RAM and splits it into an OpenGL cubemap texture.
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\param buffer the image data in RAM just as if it were still in a file
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\param buffer_length the size of the buffer in bytes
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\param face_order the order of the faces in the file, any combination of NSWEUD, for North, South, Up, etc.
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\param force_channels 0-image format, 1-luminous, 2-luminous/alpha, 3-RGB, 4-RGBA
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\param reuse_texture_ID 0-generate a new texture ID, otherwise reuse the texture ID (overwriting the old texture)
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\param flags can be any of SOIL_FLAG_POWER_OF_TWO | SOIL_FLAG_MIPMAPS | SOIL_FLAG_TEXTURE_REPEATS | SOIL_FLAG_MULTIPLY_ALPHA | SOIL_FLAG_INVERT_Y | SOIL_FLAG_COMPRESS_TO_DXT | SOIL_FLAG_DDS_LOAD_DIRECT
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\return 0-failed, otherwise returns the OpenGL texture handle
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**/
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unsigned int
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SOIL_load_OGL_single_cubemap_from_memory
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(
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const unsigned char *const buffer,
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int buffer_length,
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const char face_order[6],
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int force_channels,
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unsigned int reuse_texture_ID,
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unsigned int flags
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);
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/**
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Creates a 2D OpenGL texture from raw image data. Note that the raw data is
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_NOT_ freed after the upload (so the user can load various versions).
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\param data the raw data to be uploaded as an OpenGL texture
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\param width the width of the image in pixels
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\param height the height of the image in pixels
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\param channels the number of channels: 1-luminous, 2-luminous/alpha, 3-RGB, 4-RGBA
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\param reuse_texture_ID 0-generate a new texture ID, otherwise reuse the texture ID (overwriting the old texture)
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\param flags can be any of SOIL_FLAG_POWER_OF_TWO | SOIL_FLAG_MIPMAPS | SOIL_FLAG_TEXTURE_REPEATS | SOIL_FLAG_MULTIPLY_ALPHA | SOIL_FLAG_INVERT_Y | SOIL_FLAG_COMPRESS_TO_DXT
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\return 0-failed, otherwise returns the OpenGL texture handle
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**/
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unsigned int
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SOIL_create_OGL_texture
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(
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const unsigned char *const data,
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int width, int height, int channels,
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unsigned int reuse_texture_ID,
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unsigned int flags
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);
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/**
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Creates an OpenGL cubemap texture by splitting up 1 image into 6 parts.
|
||
|
|
\param data the raw data to be uploaded as an OpenGL texture
|
||
|
|
\param width the width of the image in pixels
|
||
|
|
\param height the height of the image in pixels
|
||
|
|
\param channels the number of channels: 1-luminous, 2-luminous/alpha, 3-RGB, 4-RGBA
|
||
|
|
\param face_order the order of the faces in the file, and combination of NSWEUD, for North, South, Up, etc.
|
||
|
|
\param reuse_texture_ID 0-generate a new texture ID, otherwise reuse the texture ID (overwriting the old texture)
|
||
|
|
\param flags can be any of SOIL_FLAG_POWER_OF_TWO | SOIL_FLAG_MIPMAPS | SOIL_FLAG_TEXTURE_REPEATS | SOIL_FLAG_MULTIPLY_ALPHA | SOIL_FLAG_INVERT_Y | SOIL_FLAG_COMPRESS_TO_DXT | SOIL_FLAG_DDS_LOAD_DIRECT
|
||
|
|
\return 0-failed, otherwise returns the OpenGL texture handle
|
||
|
|
**/
|
||
|
|
unsigned int
|
||
|
|
SOIL_create_OGL_single_cubemap
|
||
|
|
(
|
||
|
|
const unsigned char *const data,
|
||
|
|
int width, int height, int channels,
|
||
|
|
const char face_order[6],
|
||
|
|
unsigned int reuse_texture_ID,
|
||
|
|
unsigned int flags
|
||
|
|
);
|
||
|
|
|
||
|
|
/**
|
||
|
|
Captures the OpenGL window (RGB) and saves it to disk
|
||
|
|
\return 0 if it failed, otherwise returns 1
|
||
|
|
**/
|
||
|
|
int
|
||
|
|
SOIL_save_screenshot
|
||
|
|
(
|
||
|
|
const char *filename,
|
||
|
|
int image_type,
|
||
|
|
int x, int y,
|
||
|
|
int width, int height
|
||
|
|
);
|
||
|
|
|
||
|
|
/**
|
||
|
|
Loads an image from disk into an array of unsigned chars.
|
||
|
|
Note that *channels return the original channel count of the
|
||
|
|
image. If force_channels was other than SOIL_LOAD_AUTO,
|
||
|
|
the resulting image has force_channels, but *channels may be
|
||
|
|
different (if the original image had a different channel
|
||
|
|
count).
|
||
|
|
\return 0 if failed, otherwise returns 1
|
||
|
|
**/
|
||
|
|
unsigned char*
|
||
|
|
SOIL_load_image
|
||
|
|
(
|
||
|
|
const char *filename,
|
||
|
|
int *width, int *height, int *channels,
|
||
|
|
int force_channels
|
||
|
|
);
|
||
|
|
|
||
|
|
/**
|
||
|
|
Loads an image from memory into an array of unsigned chars.
|
||
|
|
Note that *channels return the original channel count of the
|
||
|
|
image. If force_channels was other than SOIL_LOAD_AUTO,
|
||
|
|
the resulting image has force_channels, but *channels may be
|
||
|
|
different (if the original image had a different channel
|
||
|
|
count).
|
||
|
|
\return 0 if failed, otherwise returns 1
|
||
|
|
**/
|
||
|
|
unsigned char*
|
||
|
|
SOIL_load_image_from_memory
|
||
|
|
(
|
||
|
|
const unsigned char *const buffer,
|
||
|
|
int buffer_length,
|
||
|
|
int *width, int *height, int *channels,
|
||
|
|
int force_channels
|
||
|
|
);
|
||
|
|
|
||
|
|
/**
|
||
|
|
Saves an image from an array of unsigned chars (RGBA) to disk
|
||
|
|
\return 0 if failed, otherwise returns 1
|
||
|
|
**/
|
||
|
|
int
|
||
|
|
SOIL_save_image
|
||
|
|
(
|
||
|
|
const char *filename,
|
||
|
|
int image_type,
|
||
|
|
int width, int height, int channels,
|
||
|
|
const unsigned char *const data
|
||
|
|
);
|
||
|
|
|
||
|
|
/**
|
||
|
|
Frees the image data (note, this is just C's "free()"...this function is
|
||
|
|
present mostly so C++ programmers don't forget to use "free()" and call
|
||
|
|
"delete []" instead [8^)
|
||
|
|
**/
|
||
|
|
void
|
||
|
|
SOIL_free_image_data
|
||
|
|
(
|
||
|
|
unsigned char *img_data
|
||
|
|
);
|
||
|
|
|
||
|
|
/**
|
||
|
|
This function resturn a pointer to a string describing the last thing
|
||
|
|
that happened inside SOIL. It can be used to determine why an image
|
||
|
|
failed to load.
|
||
|
|
**/
|
||
|
|
const char*
|
||
|
|
SOIL_last_result
|
||
|
|
(
|
||
|
|
void
|
||
|
|
);
|
||
|
|
|
||
|
|
|
||
|
|
#ifdef __cplusplus
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#endif /* HEADER_SIMPLE_OPENGL_IMAGE_LIBRARY */
|