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Move compressed textures loading to a separate self-contained library

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Ray 2022-09-17 19:26:23 +02:00
parent cb9b8f73c0
commit c328f09efc
2 changed files with 969 additions and 794 deletions
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src/external/rl_gputex.h vendored Normal file
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/**********************************************************************************************
*
* rl_gputex - GPU compressed textures loading and saving
*
* DESCRIPTION:
*
* Load GPU compressed image data from image files provided as memory data arrays,
* data is loaded compressed, ready to be loaded into GPU.
*
* Note that some file formats (DDS, PVR, KTX) also support uncompressed data storage.
* In those cases data is loaded uncompressed and format is returned.
*
* TODO:
* - Implement raylib function: rlGetGlTextureFormats(), required by rl_save_ktx_to_memory()
* - Review rl_load_ktx_from_memory() to support KTX v2.2 specs
*
* CONFIGURATION:
*
* #define RL_GPUTEX_SUPPORT_DDS
* #define RL_GPUTEX_SUPPORT_PKM
* #define RL_GPUTEX_SUPPORT_KTX
* #define RL_GPUTEX_SUPPORT_PVR
* #define RL_GPUTEX_SUPPORT_ASTC
* Define desired file formats to be supported
*
*
* LICENSE: zlib/libpng
*
* Copyright (c) 2013-2022 Ramon Santamaria (@raysan5)
*
* This software is provided "as-is", without any express or implied warranty. In no event
* will the authors be held liable for any damages arising from the use of this software.
*
* Permission is granted to anyone to use this software for any purpose, including commercial
* applications, and to alter it and redistribute it freely, subject to the following restrictions:
*
* 1. The origin of this software must not be misrepresented; you must not claim that you
* wrote the original software. If you use this software in a product, an acknowledgment
* in the product documentation would be appreciated but is not required.
*
* 2. Altered source versions must be plainly marked as such, and must not be misrepresented
* as being the original software.
*
* 3. This notice may not be removed or altered from any source distribution.
*
**********************************************************************************************/
#ifndef RL_GPUTEX_H
#define RL_GPUTEX_H
#ifndef RLAPI
#define RLAPI // Functions defined as 'extern' by default (implicit specifiers)
#endif
//----------------------------------------------------------------------------------
// Module Functions Declaration
//----------------------------------------------------------------------------------
#if defined(__cplusplus)
extern "C" { // Prevents name mangling of functions
#endif
// Load image data from memory data files
RLAPI void *rl_load_dds_from_memory(const unsigned char *file_data, unsigned int file_size, int *width, int *height, int *format, int *mips);
RLAPI void *rl_load_pkm_from_memory(const unsigned char *file_data, unsigned int file_size, int *width, int *height, int *format, int *mips);
RLAPI void *rl_load_ktx_from_memory(const unsigned char *file_data, unsigned int file_size, int *width, int *height, int *format, int *mips);
RLAPI void *rl_load_pvr_from_memory(const unsigned char *file_data, unsigned int file_size, int *width, int *height, int *format, int *mips);
RLAPI void *rl_load_astc_from_memory(const unsigned char *file_data, unsigned int file_size, int *width, int *height, int *format, int *mips);
RLAPI int rl_save_ktx_to_memory(const char *fileName, void *data, int width, int height, int format, int mipmaps); // Save image data as KTX file
#if defined(__cplusplus)
}
#endif
#endif // RL_GPUTEX_H
/***********************************************************************************
*
* RL_GPUTEX IMPLEMENTATION
*
************************************************************************************/
#if defined(RL_GPUTEX_IMPLEMENTATION)
// Simple log system to avoid RPNG_LOG() calls if required
// NOTE: Avoiding those calls, also avoids const strings memory usage
#define RL_GPUTEX_SHOW_LOG_INFO
#if defined(RL_GPUTEX_SHOW_LOG_INFO) && !defined(LOG)
#define LOG(...) printf(__VA_ARGS__)
#else
#define LOG(...)
#endif
//----------------------------------------------------------------------------------
// Module Internal Functions Declaration
//----------------------------------------------------------------------------------
// Get pixel data size in bytes for certain pixel format
static int get_pixel_data_size(int width, int height, int format);
//----------------------------------------------------------------------------------
// Module Functions Definition
//----------------------------------------------------------------------------------
#if defined(RL_GPUTEX_SUPPORT_DDS)
// Loading DDS from memory image data (compressed or uncompressed)
void *rl_load_dds_from_memory(const unsigned char *file_data, unsigned int file_size, int *width, int *height, int *format, int *mips)
{
void *image_data = NULL; // Image data pointer
int image_pixel_size = 0; // Image pixel size
unsigned char *file_data_ptr = (unsigned char *)file_data;
// Required extension:
// GL_EXT_texture_compression_s3tc
// Supported tokens (defined by extensions)
// GL_COMPRESSED_RGB_S3TC_DXT1_EXT 0x83F0
// GL_COMPRESSED_RGBA_S3TC_DXT1_EXT 0x83F1
// GL_COMPRESSED_RGBA_S3TC_DXT3_EXT 0x83F2
// GL_COMPRESSED_RGBA_S3TC_DXT5_EXT 0x83F3
#define FOURCC_DXT1 0x31545844 // Equivalent to "DXT1" in ASCII
#define FOURCC_DXT3 0x33545844 // Equivalent to "DXT3" in ASCII
#define FOURCC_DXT5 0x35545844 // Equivalent to "DXT5" in ASCII
// DDS Pixel Format
typedef struct {
unsigned int size;
unsigned int flags;
unsigned int fourcc;
unsigned int rgb_bit_count;
unsigned int r_bit_mask;
unsigned int g_bit_mask;
unsigned int b_bit_mask;
unsigned int a_bit_mask;
} dds_pixel_format;
// DDS Header (124 bytes)
typedef struct {
unsigned int size;
unsigned int flags;
unsigned int height;
unsigned int width;
unsigned int pitch_or_linear_size;
unsigned int depth;
unsigned int mipmap_count;
unsigned int reserved1[11];
dds_pixel_format ddspf;
unsigned int caps;
unsigned int caps2;
unsigned int caps3;
unsigned int caps4;
unsigned int reserved2;
} dds_header;
if (file_data_ptr != NULL)
{
// Verify the type of file
unsigned char *dds_header_id = file_data_ptr;
file_data_ptr += 4;
if ((dds_header_id[0] != 'D') || (dds_header_id[1] != 'D') || (dds_header_id[2] != 'S') || (dds_header_id[3] != ' '))
{
LOG("WARNING: IMAGE: DDS file data not valid");
}
else
{
dds_header *header = (dds_header *)file_data_ptr;
file_data_ptr += sizeof(dds_header); // Skip header
*width = header->width;
*height = header->height;
image_pixel_size = header->width*header->height;
if (header->mipmap_count == 0) *mips = 1; // Parameter not used
else *mips = header->mipmap_count;
if (header->ddspf.rgb_bit_count == 16) // 16bit mode, no compressed
{
if (header->ddspf.flags == 0x40) // No alpha channel
{
int data_size = image_pixel_size*sizeof(unsigned short);
image_data = RL_MALLOC(data_size);
memcpy(image_data, file_data_ptr, data_size);
*format = PIXELFORMAT_UNCOMPRESSED_R5G6B5;
}
else if (header->ddspf.flags == 0x41) // With alpha channel
{
if (header->ddspf.a_bit_mask == 0x8000) // 1bit alpha
{
int data_size = image_pixel_size*sizeof(unsigned short);
image_data = RL_MALLOC(data_size);
memcpy(image_data, file_data_ptr, data_size);
unsigned char alpha = 0;
// NOTE: Data comes as A1R5G5B5, it must be reordered to R5G5B5A1
for (int i = 0; i < image_pixel_size; i++)
{
alpha = ((unsigned short *)image_data)[i] >> 15;
((unsigned short *)image_data)[i] = ((unsigned short *)image_data)[i] << 1;
((unsigned short *)image_data)[i] += alpha;
}
*format = PIXELFORMAT_UNCOMPRESSED_R5G5B5A1;
}
else if (header->ddspf.a_bit_mask == 0xf000) // 4bit alpha
{
int data_size = image_pixel_size*sizeof(unsigned short);
image_data = RL_MALLOC(data_size);
memcpy(image_data, file_data_ptr, data_size);
unsigned char alpha = 0;
// NOTE: Data comes as A4R4G4B4, it must be reordered R4G4B4A4
for (int i = 0; i < image_pixel_size; i++)
{
alpha = ((unsigned short *)image_data)[i] >> 12;
((unsigned short *)image_data)[i] = ((unsigned short *)image_data)[i] << 4;
((unsigned short *)image_data)[i] += alpha;
}
*format = PIXELFORMAT_UNCOMPRESSED_R4G4B4A4;
}
}
}
else if (header->ddspf.flags == 0x40 && header->ddspf.rgb_bit_count == 24) // DDS_RGB, no compressed
{
int data_size = image_pixel_size*3*sizeof(unsigned char);
image_data = RL_MALLOC(data_size);
memcpy(image_data, file_data_ptr, data_size);
*format = PIXELFORMAT_UNCOMPRESSED_R8G8B8;
}
else if (header->ddspf.flags == 0x41 && header->ddspf.rgb_bit_count == 32) // DDS_RGBA, no compressed
{
int data_size = image_pixel_size*4*sizeof(unsigned char);
image_data = RL_MALLOC(data_size);
memcpy(image_data, file_data_ptr, data_size);
unsigned char blue = 0;
// NOTE: Data comes as A8R8G8B8, it must be reordered R8G8B8A8 (view next comment)
// DirecX understand ARGB as a 32bit DWORD but the actual memory byte alignment is BGRA
// So, we must realign B8G8R8A8 to R8G8B8A8
for (int i = 0; i < image_pixel_size*4; i += 4)
{
blue = ((unsigned char *)image_data)[i];
((unsigned char *)image_data)[i] = ((unsigned char *)image_data)[i + 2];
((unsigned char *)image_data)[i + 2] = blue;
}
*format = PIXELFORMAT_UNCOMPRESSED_R8G8B8A8;
}
else if (((header->ddspf.flags == 0x04) || (header->ddspf.flags == 0x05)) && (header->ddspf.fourcc > 0)) // Compressed
{
int data_size = 0;
// Calculate data size, including all mipmaps
if (header->mipmap_count > 1) data_size = header->pitch_or_linear_size*2;
else data_size = header->pitch_or_linear_size;
image_data = RL_MALLOC(data_size*sizeof(unsigned char));
memcpy(image_data, file_data_ptr, data_size);
switch (header->ddspf.fourcc)
{
case FOURCC_DXT1:
{
if (header->ddspf.flags == 0x04) *format = PIXELFORMAT_COMPRESSED_DXT1_RGB;
else *format = PIXELFORMAT_COMPRESSED_DXT1_RGBA;
} break;
case FOURCC_DXT3: *format = PIXELFORMAT_COMPRESSED_DXT3_RGBA; break;
case FOURCC_DXT5: *format = PIXELFORMAT_COMPRESSED_DXT5_RGBA; break;
default: break;
}
}
}
}
return image_data;
}
#endif
#if defined(RL_GPUTEX_SUPPORT_PKM)
// Loading PKM image data (ETC1/ETC2 compression)
// NOTE: KTX is the standard Khronos Group compression format (ETC1/ETC2, mipmaps)
// PKM is a much simpler file format used mainly to contain a single ETC1/ETC2 compressed image (no mipmaps)
void *rl_load_pkm_from_memory(const unsigned char *file_data, unsigned int file_size, int *width, int *height, int *format, int *mips)
{
void *image_data = NULL; // Image data pointer
unsigned char *file_data_ptr = (unsigned char *)file_data;
// Required extensions:
// GL_OES_compressed_ETC1_RGB8_texture (ETC1) (OpenGL ES 2.0)
// GL_ARB_ES3_compatibility (ETC2/EAC) (OpenGL ES 3.0)
// Supported tokens (defined by extensions)
// GL_ETC1_RGB8_OES 0x8D64
// GL_COMPRESSED_RGB8_ETC2 0x9274
// GL_COMPRESSED_RGBA8_ETC2_EAC 0x9278
// PKM file (ETC1) Header (16 bytes)
typedef struct {
char id[4]; // "PKM "
char version[2]; // "10" or "20"
unsigned short format; // Data format (big-endian) (Check list below)
unsigned short width; // Texture width (big-endian) (orig_width rounded to multiple of 4)
unsigned short height; // Texture height (big-endian) (orig_height rounded to multiple of 4)
unsigned short orig_width; // Original width (big-endian)
unsigned short orig_height; // Original height (big-endian)
} pkm_header;
// Formats list
// version 10: format: 0=ETC1_RGB, [1=ETC1_RGBA, 2=ETC1_RGB_MIP, 3=ETC1_RGBA_MIP] (not used)
// version 20: format: 0=ETC1_RGB, 1=ETC2_RGB, 2=ETC2_RGBA_OLD, 3=ETC2_RGBA, 4=ETC2_RGBA1, 5=ETC2_R, 6=ETC2_RG, 7=ETC2_SIGNED_R, 8=ETC2_SIGNED_R
// NOTE: The extended width and height are the widths rounded up to a multiple of 4.
// NOTE: ETC is always 4bit per pixel (64 bit for each 4x4 block of pixels)
if (file_data_ptr != NULL)
{
pkm_header *header = (pkm_header *)file_data_ptr;
if ((header->id[0] != 'P') || (header->id[1] != 'K') || (header->id[2] != 'M') || (header->id[3] != ' '))
{
LOG("WARNING: IMAGE: PKM file data not valid");
}
else
{
file_data_ptr += sizeof(pkm_header); // Skip header
// NOTE: format, width and height come as big-endian, data must be swapped to little-endian
header->format = ((header->format & 0x00FF) << 8) | ((header->format & 0xFF00) >> 8);
header->width = ((header->width & 0x00FF) << 8) | ((header->width & 0xFF00) >> 8);
header->height = ((header->height & 0x00FF) << 8) | ((header->height & 0xFF00) >> 8);
*width = header->width;
*height = header->height;
*mips = 1;
int bpp = 4;
if (header->format == 3) bpp = 8;
int data_size = (*width)*(*height)*bpp/8; // Total data size in bytes
image_data = RL_MALLOC(data_size*sizeof(unsigned char));
memcpy(image_data, file_data_ptr, data_size);
if (header->format == 0) *format = PIXELFORMAT_COMPRESSED_ETC1_RGB;
else if (header->format == 1) *format = PIXELFORMAT_COMPRESSED_ETC2_RGB;
else if (header->format == 3) *format = PIXELFORMAT_COMPRESSED_ETC2_EAC_RGBA;
}
}
return image_data;
}
#endif
#if defined(RL_GPUTEX_SUPPORT_KTX)
// Load KTX compressed image data (ETC1/ETC2 compression)
// TODO: Review KTX loading, many things changed!
void *rl_load_ktx_from_memory(const unsigned char *file_data, unsigned int file_size, int *width, int *height, int *format, int *mips)
{
void *image_data = NULL; // Image data pointer
unsigned char *file_data_ptr = (unsigned char *)file_data;
// Required extensions:
// GL_OES_compressed_ETC1_RGB8_texture (ETC1)
// GL_ARB_ES3_compatibility (ETC2/EAC)
// Supported tokens (defined by extensions)
// GL_ETC1_RGB8_OES 0x8D64
// GL_COMPRESSED_RGB8_ETC2 0x9274
// GL_COMPRESSED_RGBA8_ETC2_EAC 0x9278
// KTX file Header (64 bytes)
// v1.1 - https://www.khronos.org/opengles/sdk/tools/KTX/file_format_spec/
// v2.0 - http://github.khronos.org/KTX-Specification/
// KTX 1.1 Header
// TODO: Support KTX 2.2 specs!
typedef struct {
char id[12]; // Identifier: "«KTX 11»\r\n\x1A\n"
unsigned int endianness; // Little endian: 0x01 0x02 0x03 0x04
unsigned int gl_type; // For compressed textures, glType must equal 0
unsigned int gl_type_size; // For compressed texture data, usually 1
unsigned int gl_format; // For compressed textures is 0
unsigned int gl_internal_format; // Compressed internal format
unsigned int gl_base_internal_format; // Same as glFormat (RGB, RGBA, ALPHA...)
unsigned int width; // Texture image width in pixels
unsigned int height; // Texture image height in pixels
unsigned int depth; // For 2D textures is 0
unsigned int elements; // Number of array elements, usually 0
unsigned int faces; // Cubemap faces, for no-cubemap = 1
unsigned int mipmap_levels; // Non-mipmapped textures = 1
unsigned int key_value_data_size; // Used to encode any arbitrary data...
} ktx_header;
// NOTE: Before start of every mipmap data block, we have: unsigned int data_size
if (file_data_ptr != NULL)
{
ktx_header *header = (ktx_header *)file_data_ptr;
if ((header->id[1] != 'K') || (header->id[2] != 'T') || (header->id[3] != 'X') ||
(header->id[4] != ' ') || (header->id[5] != '1') || (header->id[6] != '1'))
{
LOG("WARNING: IMAGE: KTX file data not valid");
}
else
{
file_data_ptr += sizeof(ktx_header); // Move file data pointer
*width = header->width;
*height = header->height;
*mips = header->mipmap_levels;
file_data_ptr += header->key_value_data_size; // Skip value data size
int data_size = ((int *)file_data_ptr)[0];
file_data_ptr += sizeof(int);
image_data = RL_MALLOC(data_size*sizeof(unsigned char));
memcpy(image_data, file_data_ptr, data_size);
if (header->gl_internal_format == 0x8D64) *format = PIXELFORMAT_COMPRESSED_ETC1_RGB;
else if (header->gl_internal_format == 0x9274) *format = PIXELFORMAT_COMPRESSED_ETC2_RGB;
else if (header->gl_internal_format == 0x9278) *format = PIXELFORMAT_COMPRESSED_ETC2_EAC_RGBA;
// TODO: Support uncompressed data formats? Right now it returns format = 0!
}
}
return image_data;
}
// Save image data as KTX file
// NOTE: By default KTX 1.1 spec is used, 2.0 is still on draft (01Oct2018)
// TODO: Review KTX saving, many things changed!
int rl_save_ktx(const char *file_name, void *data, int width, int height, int format, int mipmaps)
{
// KTX file Header (64 bytes)
// v1.1 - https://www.khronos.org/opengles/sdk/tools/KTX/file_format_spec/
// v2.0 - http://github.khronos.org/KTX-Specification/ - Final specs by 2021-04-18
typedef struct {
char id[12]; // Identifier: "«KTX 11»\r\n\x1A\n" // KTX 2.0: "«KTX 22»\r\n\x1A\n"
unsigned int endianness; // Little endian: 0x01 0x02 0x03 0x04
unsigned int gl_type; // For compressed textures, glType must equal 0
unsigned int gl_type_size; // For compressed texture data, usually 1
unsigned int gl_format; // For compressed textures is 0
unsigned int gl_internal_format; // Compressed internal format
unsigned int gl_base_internal_format; // Same as glFormat (RGB, RGBA, ALPHA...) // KTX 2.0: UInt32 vkFormat
unsigned int width; // Texture image width in pixels
unsigned int height; // Texture image height in pixels
unsigned int depth; // For 2D textures is 0
unsigned int elements; // Number of array elements, usually 0
unsigned int faces; // Cubemap faces, for no-cubemap = 1
unsigned int mipmap_levels; // Non-mipmapped textures = 1
unsigned int key_value_data_size; // Used to encode any arbitrary data... // KTX 2.0: UInt32 levelOrder - ordering of the mipmap levels, usually 0
// KTX 2.0: UInt32 supercompressionScheme - 0 (None), 1 (Crunch CRN), 2 (Zlib DEFLATE)...
// KTX 2.0 defines additional header elements...
} ktx_header;
// Calculate file data_size required
int data_size = sizeof(ktx_header);
for (int i = 0, width = width, height = height; i < mipmaps; i++)
{
data_size += get_pixel_data_size(width, height, format);
width /= 2; height /= 2;
}
unsigned char *file_data = RL_CALLOC(data_size, 1);
unsigned char *file_data_ptr = file_data;
ktx_header header = { 0 };
// KTX identifier (v1.1)
//unsigned char id[12] = { '«', 'K', 'T', 'X', ' ', '1', '1', '»', '\r', '\n', '\x1A', '\n' };
//unsigned char id[12] = { 0xAB, 0x4B, 0x54, 0x58, 0x20, 0x31, 0x31, 0xBB, 0x0D, 0x0A, 0x1A, 0x0A };
const char ktx_identifier[12] = { 0xAB, 'K', 'T', 'X', ' ', '1', '1', 0xBB, '\r', '\n', 0x1A, '\n' };
// Get the image header
memcpy(header.id, ktx_identifier, 12); // KTX 1.1 signature
header.endianness = 0;
header.gl_type = 0; // Obtained from format
header.gl_type_size = 1;
header.gl_format = 0; // Obtained from format
header.gl_internal_format = 0; // Obtained from format
header.gl_base_internal_format = 0;
header.width = width;
header.height = height;
header.depth = 0;
header.elements = 0;
header.faces = 1;
header.mipmap_levels = mipmaps; // If it was 0, it means mipmaps should be generated on loading (not for compressed formats)
header.key_value_data_size = 0; // No extra data after the header
rlGetGlTextureFormats(format, &header.gl_internal_format, &header.gl_format, &header.gl_type); // rlgl module function
header.gl_base_internal_format = header.gl_format; // KTX 1.1 only
// NOTE: We can save into a .ktx all PixelFormats supported by raylib, including compressed formats like DXT, ETC or ASTC
if (header.gl_format == -1) LOG("WARNING: IMAGE: GL format not supported for KTX export (%i)", header.gl_format);
else
{
memcpy(file_data_ptr, &header, sizeof(ktx_header));
file_data_ptr += sizeof(ktx_header);
int temp_width = width;
int temp_height = height;
int data_offset = 0;
// Save all mipmaps data
for (int i = 0; i < mipmaps; i++)
{
unsigned int data_size = get_pixel_data_size(temp_width, temp_height, format);
memcpy(file_data_ptr, &data_size, sizeof(unsigned int));
memcpy(file_data_ptr + 4, (unsigned char *)data + data_offset, data_size);
temp_width /= 2;
temp_height /= 2;
data_offset += data_size;
file_data_ptr += (4 + data_size);
}
}
// Save file data to file
int success = false;
FILE *file = fopen(file_name, "wb");
if (file != NULL)
{
unsigned int count = (unsigned int)fwrite(file_data, sizeof(unsigned char), data_size, file);
if (count == 0) LOG("WARNING: FILEIO: [%s] Failed to write file", file_name);
else if (count != data_size) LOG("WARNING: FILEIO: [%s] File partially written", file_name);
else LOG("INFO: FILEIO: [%s] File saved successfully", file_name);
int result = fclose(file);
if (result == 0) success = true;
}
else LOG("WARNING: FILEIO: [%s] Failed to open file", file_name);
RL_FREE(file_data); // Free file data buffer
// If all data has been written correctly to file, success = 1
return success;
}
#endif
#if defined(RL_GPUTEX_SUPPORT_PVR)
// Loading PVR image data (uncompressed or PVRT compression)
// NOTE: PVR v2 not supported, use PVR v3 instead
void *rl_load_pvr_from_memory(const unsigned char *file_data, unsigned int file_size, int *width, int *height, int *format, int *mips)
{
void *image_data = NULL; // Image data pointer
unsigned char *file_data_ptr = (unsigned char *)file_data;
// Required extension:
// GL_IMG_texture_compression_pvrtc
// Supported tokens (defined by extensions)
// GL_COMPRESSED_RGB_PVRTC_4BPPV1_IMG 0x8C00
// GL_COMPRESSED_RGBA_PVRTC_4BPPV1_IMG 0x8C02
#if 0 // Not used...
// PVR file v2 Header (52 bytes)
typedef struct {
unsigned int headerLength;
unsigned int height;
unsigned int width;
unsigned int numMipmaps;
unsigned int flags;
unsigned int dataLength;
unsigned int bpp;
unsigned int bitmaskRed;
unsigned int bitmaskGreen;
unsigned int bitmaskBlue;
unsigned int bitmaskAlpha;
unsigned int pvrTag;
unsigned int numSurfs;
} PVRHeaderV2;
#endif
// PVR file v3 Header (52 bytes)
// NOTE: After it could be metadata (15 bytes?)
typedef struct {
char id[4];
unsigned int flags;
unsigned char channels[4]; // pixelFormat high part
unsigned char channel_depth[4]; // pixelFormat low part
unsigned int color_space;
unsigned int channel_type;
unsigned int height;
unsigned int width;
unsigned int depth;
unsigned int num_surfaces;
unsigned int num_faces;
unsigned int num_mipmaps;
unsigned int metadata_size;
} pvr_header;
#if 0 // Not used...
// Metadata (usually 15 bytes)
typedef struct {
unsigned int devFOURCC;
unsigned int key;
unsigned int data_size; // Not used?
unsigned char *data; // Not used?
} PVRMetadata;
#endif
if (file_data_ptr != NULL)
{
// Check PVR image version
unsigned char pvr_version = file_data_ptr[0];
// Load different PVR data formats
if (pvr_version == 0x50)
{
pvr_header *header = (pvr_header *)file_data_ptr;
if ((header->id[0] != 'P') || (header->id[1] != 'V') || (header->id[2] != 'R') || (header->id[3] != 3))
{
LOG("WARNING: IMAGE: PVR file data not valid");
}
else
{
file_data_ptr += sizeof(pvr_header); // Skip header
*width = header->width;
*height = header->height;
*mips = header->num_mipmaps;
// Check data format
if (((header->channels[0] == 'l') && (header->channels[1] == 0)) && (header->channel_depth[0] == 8)) *format = PIXELFORMAT_UNCOMPRESSED_GRAYSCALE;
else if (((header->channels[0] == 'l') && (header->channels[1] == 'a')) && ((header->channel_depth[0] == 8) && (header->channel_depth[1] == 8))) *format = PIXELFORMAT_UNCOMPRESSED_GRAY_ALPHA;
else if ((header->channels[0] == 'r') && (header->channels[1] == 'g') && (header->channels[2] == 'b'))
{
if (header->channels[3] == 'a')
{
if ((header->channel_depth[0] == 5) && (header->channel_depth[1] == 5) && (header->channel_depth[2] == 5) && (header->channel_depth[3] == 1)) *format = PIXELFORMAT_UNCOMPRESSED_R5G5B5A1;
else if ((header->channel_depth[0] == 4) && (header->channel_depth[1] == 4) && (header->channel_depth[2] == 4) && (header->channel_depth[3] == 4)) *format = PIXELFORMAT_UNCOMPRESSED_R4G4B4A4;
else if ((header->channel_depth[0] == 8) && (header->channel_depth[1] == 8) && (header->channel_depth[2] == 8) && (header->channel_depth[3] == 8)) *format = PIXELFORMAT_UNCOMPRESSED_R8G8B8A8;
}
else if (header->channels[3] == 0)
{
if ((header->channel_depth[0] == 5) && (header->channel_depth[1] == 6) && (header->channel_depth[2] == 5)) *format = PIXELFORMAT_UNCOMPRESSED_R5G6B5;
else if ((header->channel_depth[0] == 8) && (header->channel_depth[1] == 8) && (header->channel_depth[2] == 8)) *format = PIXELFORMAT_UNCOMPRESSED_R8G8B8;
}
}
else if (header->channels[0] == 2) *format = PIXELFORMAT_COMPRESSED_PVRT_RGB;
else if (header->channels[0] == 3) *format = PIXELFORMAT_COMPRESSED_PVRT_RGBA;
file_data_ptr += header->metadata_size; // Skip meta data header
// Calculate data size (depends on format)
int bpp = 0;
switch (*format)
{
case PIXELFORMAT_UNCOMPRESSED_GRAYSCALE: bpp = 8; break;
case PIXELFORMAT_UNCOMPRESSED_GRAY_ALPHA:
case PIXELFORMAT_UNCOMPRESSED_R5G5B5A1:
case PIXELFORMAT_UNCOMPRESSED_R5G6B5:
case PIXELFORMAT_UNCOMPRESSED_R4G4B4A4: bpp = 16; break;
case PIXELFORMAT_UNCOMPRESSED_R8G8B8A8: bpp = 32; break;
case PIXELFORMAT_UNCOMPRESSED_R8G8B8: bpp = 24; break;
case PIXELFORMAT_COMPRESSED_PVRT_RGB:
case PIXELFORMAT_COMPRESSED_PVRT_RGBA: bpp = 4; break;
default: break;
}
int data_size = (*width)*(*height)*bpp/8; // Total data size in bytes
image_data = RL_MALLOC(data_size*sizeof(unsigned char));
memcpy(image_data, file_data_ptr, data_size);
}
}
else if (pvr_version == 52) LOG("INFO: IMAGE: PVRv2 format not supported, update your files to PVRv3");
}
return image_data;
}
#endif
#if defined(RL_GPUTEX_SUPPORT_ASTC)
// Load ASTC compressed image data (ASTC compression)
void *rl_load_astc_from_memory(const unsigned char *file_data, unsigned int file_size, int *width, int *height, int *format, int *mips)
{
void *image_data = NULL; // Image data pointer
unsigned char *file_data_ptr = (unsigned char *)file_data;
// Required extensions:
// GL_KHR_texture_compression_astc_hdr
// GL_KHR_texture_compression_astc_ldr
// Supported tokens (defined by extensions)
// GL_COMPRESSED_RGBA_ASTC_4x4_KHR 0x93b0
// GL_COMPRESSED_RGBA_ASTC_8x8_KHR 0x93b7
// ASTC file Header (16 bytes)
typedef struct {
unsigned char id[4]; // Signature: 0x13 0xAB 0xA1 0x5C
unsigned char blockX; // Block X dimensions
unsigned char blockY; // Block Y dimensions
unsigned char blockZ; // Block Z dimensions (1 for 2D images)
unsigned char width[3]; // void *width in pixels (24bit value)
unsigned char height[3]; // void *height in pixels (24bit value)
unsigned char length[3]; // void *Z-size (1 for 2D images)
} astc_header;
if (file_data_ptr != NULL)
{
astc_header *header = (astc_header *)file_data_ptr;
if ((header->id[3] != 0x5c) || (header->id[2] != 0xa1) || (header->id[1] != 0xab) || (header->id[0] != 0x13))
{
LOG("WARNING: IMAGE: ASTC file data not valid");
}
else
{
file_data_ptr += sizeof(astc_header); // Skip header
// NOTE: Assuming Little Endian (could it be wrong?)
*width = 0x00000000 | ((int)header->width[2] << 16) | ((int)header->width[1] << 8) | ((int)header->width[0]);
*height = 0x00000000 | ((int)header->height[2] << 16) | ((int)header->height[1] << 8) | ((int)header->height[0]);
*mips = 1; // NOTE: ASTC format only contains one mipmap level
// NOTE: Each block is always stored in 128bit so we can calculate the bpp
int bpp = 128/(header->blockX*header->blockY);
// NOTE: Currently we only support 2 blocks configurations: 4x4 and 8x8
if ((bpp == 8) || (bpp == 2))
{
int data_size = (*width)*(*height)*bpp/8; // Data size in bytes
image_data = RL_MALLOC(data_size*sizeof(unsigned char));
memcpy(image_data, file_data_ptr, data_size);
if (bpp == 8) *format = PIXELFORMAT_COMPRESSED_ASTC_4x4_RGBA;
else if (bpp == 2) *format = PIXELFORMAT_COMPRESSED_ASTC_8x8_RGBA;
}
else LOG("WARNING: IMAGE: ASTC block size configuration not supported");
}
}
return image_data;
}
#endif
//----------------------------------------------------------------------------------
// Module Internal Functions Definition
//----------------------------------------------------------------------------------
// Get pixel data size in bytes for certain pixel format
static int get_pixel_data_size(int width, int height, int format)
{
int data_size = 0; // Size in bytes
int bpp = 0; // Bits per pixel
switch (format)
{
case PIXELFORMAT_UNCOMPRESSED_GRAYSCALE: bpp = 8; break;
case PIXELFORMAT_UNCOMPRESSED_GRAY_ALPHA:
case PIXELFORMAT_UNCOMPRESSED_R5G6B5:
case PIXELFORMAT_UNCOMPRESSED_R5G5B5A1:
case PIXELFORMAT_UNCOMPRESSED_R4G4B4A4: bpp = 16; break;
case PIXELFORMAT_UNCOMPRESSED_R8G8B8A8: bpp = 32; break;
case PIXELFORMAT_UNCOMPRESSED_R8G8B8: bpp = 24; break;
case PIXELFORMAT_UNCOMPRESSED_R32: bpp = 32; break;
case PIXELFORMAT_UNCOMPRESSED_R32G32B32: bpp = 32*3; break;
case PIXELFORMAT_UNCOMPRESSED_R32G32B32A32: bpp = 32*4; break;
case PIXELFORMAT_COMPRESSED_DXT1_RGB:
case PIXELFORMAT_COMPRESSED_DXT1_RGBA:
case PIXELFORMAT_COMPRESSED_ETC1_RGB:
case PIXELFORMAT_COMPRESSED_ETC2_RGB:
case PIXELFORMAT_COMPRESSED_PVRT_RGB:
case PIXELFORMAT_COMPRESSED_PVRT_RGBA: bpp = 4; break;
case PIXELFORMAT_COMPRESSED_DXT3_RGBA:
case PIXELFORMAT_COMPRESSED_DXT5_RGBA:
case PIXELFORMAT_COMPRESSED_ETC2_EAC_RGBA:
case PIXELFORMAT_COMPRESSED_ASTC_4x4_RGBA: bpp = 8; break;
case PIXELFORMAT_COMPRESSED_ASTC_8x8_RGBA: bpp = 2; break;
default: break;
}
data_size = width*height*bpp/8; // Total data size in bytes
// Most compressed formats works on 4x4 blocks,
// if texture is smaller, minimum dataSize is 8 or 16
if ((width < 4) && (height < 4))
{
if ((format >= PIXELFORMAT_COMPRESSED_DXT1_RGB) && (format < PIXELFORMAT_COMPRESSED_DXT3_RGBA)) data_size = 8;
else if ((format >= PIXELFORMAT_COMPRESSED_DXT3_RGBA) && (format < PIXELFORMAT_COMPRESSED_ASTC_8x8_RGBA)) data_size = 16;
}
return data_size;
}
#endif // RL_GPUTEX_IMPLEMENTATION

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src/rtextures.c
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