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#include "TextureFormat.h"
#include "../ServiceLocator.h"
#include "../../Main.h"
#if defined(DEATH_TARGET_ANDROID)
# include <android/api-level.h>
#endif
namespace nCine
{
TextureFormat::TextureFormat(GLenum internalFormat)
: internalFormat_(internalFormat), format_(-1), type_(-1), isCompressed_(false)
{
findExternalFormat();
checkFormatSupport();
}
TextureFormat::TextureFormat(GLenum internalFormat, GLenum type)
: internalFormat_(internalFormat), format_(-1), type_(-1), isCompressed_(false)
{
findExternalFormat();
checkFormatSupport();
// Overriding the type found by `findExternalFormat()`
type_ = type;
}
std::uint32_t TextureFormat::numChannels() const
{
switch (format_) {
case GL_RED:
return 1;
case GL_RG:
return 2;
case GL_RGB:
return 3;
case GL_RGBA:
#if !defined(WITH_OPENGLES)
case GL_BGRA:
#else
case GL_BGRA_EXT:
#endif
default:
return 4;
}
}
void TextureFormat::bgrFormat()
{
if (format_ == GL_RGBA) {
#if !defined(WITH_OPENGLES)
format_ = GL_BGRA;
#else
format_ = GL_BGRA_EXT;
#endif
}
#if !defined(WITH_OPENGLES)
else if (format_ == GL_RGB) {
format_ = GL_BGR;
}
#endif
}
std::uint32_t TextureFormat::calculateMipSizes(GLenum internalFormat, std::int32_t width, std::int32_t height, std::int32_t mipMapCount, std::uint32_t* mipDataOffsets, std::uint32_t* mipDataSizes)
{
std::uint32_t blockWidth = 1; // Compression block width in pixels
std::uint32_t blockHeight = 1; // Compression block height in pixels
std::uint32_t bpp = 1; // Bits per pixel
std::uint32_t blockSize = 0; // Compression block size in byts
std::uint32_t minDataSize = 1; // Minimum data size in bytes
switch (internalFormat) {
case GL_RGBA8:
bpp = 32;
break;
case GL_RGB8:
bpp = 24;
break;
case GL_RG8:
case GL_RGB565:
case GL_RGB5_A1:
case GL_RGBA4:
bpp = 16;
break;
case GL_R8:
bpp = 8;
break;
case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
// max(1, width / 4) x max(1, height / 4) x 8(DXT1)
blockWidth = 4;
blockHeight = 4;
bpp = 4;
minDataSize = 8;
break;
case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
// max(1, width / 4) x max(1, height / 4) x 16(DXT2-5)
blockWidth = 4;
blockHeight = 4;
bpp = 8;
minDataSize = 16;
break;
#if defined(WITH_OPENGLES)
case GL_ETC1_RGB8_OES:
case GL_COMPRESSED_RGB8_ETC2:
case GL_COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_ETC2:
case GL_COMPRESSED_R11_EAC:
blockWidth = 4;
blockHeight = 4;
bpp = 4;
minDataSize = 8;
break;
case GL_COMPRESSED_RGBA8_ETC2_EAC:
case GL_COMPRESSED_RG11_EAC:
blockWidth = 4;
blockHeight = 4;
bpp = 8;
minDataSize = 16;
break;
case GL_ATC_RGBA_EXPLICIT_ALPHA_AMD:
case GL_ATC_RGBA_INTERPOLATED_ALPHA_AMD:
// ((width_in_texels+3)/4) * ((height_in_texels+3)/4) * 16
blockWidth = 4;
blockHeight = 4;
bpp = 8;
minDataSize = 16;
break;
case GL_ATC_RGB_AMD:
// ((width_in_texels+3)/4) * ((height_in_texels+3)/4) * 8
blockWidth = 4;
blockHeight = 4;
bpp = 4;
minDataSize = 8;
break;
case GL_COMPRESSED_RGB_PVRTC_2BPPV1_IMG:
case GL_COMPRESSED_RGBA_PVRTC_2BPPV1_IMG:
blockWidth = 8;
blockHeight = 4;
bpp = 2;
minDataSize = 2 * 2 * ((blockWidth * blockHeight * bpp) / 8);
break;
case GL_COMPRESSED_RGB_PVRTC_4BPPV1_IMG:
case GL_COMPRESSED_RGBA_PVRTC_4BPPV1_IMG:
blockWidth = 4;
blockHeight = 4;
bpp = 4;
minDataSize = 2 * 2 * ((blockWidth * blockHeight * bpp) / 8);
break;
# if (!defined(DEATH_TARGET_ANDROID) && defined(WITH_OPENGLES)) || (defined(DEATH_TARGET_ANDROID) && __ANDROID_API__ >= 21)
case GL_COMPRESSED_RGBA_ASTC_4x4_KHR:
blockWidth = 4;
blockHeight = 4;
blockSize = 16;
minDataSize = 16;
break;
case GL_COMPRESSED_RGBA_ASTC_5x4_KHR:
blockWidth = 5;
blockHeight = 4;
blockSize = 16;
minDataSize = 16;
break;
case GL_COMPRESSED_RGBA_ASTC_5x5_KHR:
blockWidth = 5;
blockHeight = 5;
blockSize = 16;
minDataSize = 16;
break;
case GL_COMPRESSED_RGBA_ASTC_6x5_KHR:
blockWidth = 6;
blockHeight = 5;
blockSize = 16;
minDataSize = 16;
break;
case GL_COMPRESSED_RGBA_ASTC_6x6_KHR:
blockWidth = 6;
blockHeight = 6;
blockSize = 16;
minDataSize = 16;
break;
case GL_COMPRESSED_RGBA_ASTC_8x5_KHR:
blockWidth = 8;
blockHeight = 5;
blockSize = 16;
minDataSize = 16;
break;
case GL_COMPRESSED_RGBA_ASTC_8x6_KHR:
blockWidth = 8;
blockHeight = 6;
blockSize = 16;
minDataSize = 16;
break;
case GL_COMPRESSED_RGBA_ASTC_8x8_KHR:
blockWidth = 8;
blockHeight = 8;
blockSize = 16;
minDataSize = 16;
break;
case GL_COMPRESSED_RGBA_ASTC_10x5_KHR:
blockWidth = 10;
blockHeight = 5;
blockSize = 16;
minDataSize = 16;
break;
case GL_COMPRESSED_RGBA_ASTC_10x6_KHR:
blockWidth = 10;
blockHeight = 6;
blockSize = 16;
minDataSize = 16;
break;
case GL_COMPRESSED_RGBA_ASTC_10x8_KHR:
blockWidth = 10;
blockHeight = 8;
blockSize = 16;
minDataSize = 16;
break;
case GL_COMPRESSED_RGBA_ASTC_10x10_KHR:
blockWidth = 10;
blockHeight = 10;
blockSize = 16;
minDataSize = 16;
break;
case GL_COMPRESSED_RGBA_ASTC_12x10_KHR:
blockWidth = 12;
blockHeight = 10;
blockSize = 16;
minDataSize = 16;
break;
case GL_COMPRESSED_RGBA_ASTC_12x12_KHR:
blockWidth = 12;
blockHeight = 12;
blockSize = 16;
minDataSize = 16;
break;
# endif
#endif
default:
LOGF("MIP maps not supported for internal format: 0x{:x}", internalFormat);
break;
}
std::int32_t levelWidth = width;
std::int32_t levelHeight = height;
std::uint32_t dataSizesSum = 0;
DEATH_ASSERT(mipDataOffsets);
DEATH_ASSERT(mipDataSizes);
for (std::int32_t i = 0; i < mipMapCount; i++) {
mipDataOffsets[i] = dataSizesSum;
mipDataSizes[i] = (blockSize > 0)
? (levelWidth / blockWidth) * (levelHeight / blockHeight) * blockSize
: (levelWidth / blockWidth) * (levelHeight / blockHeight) * ((blockWidth * blockHeight * bpp) / 8);
// Clamping to the minimum valid size
if (mipDataSizes[i] < minDataSize) {
mipDataSizes[i] = minDataSize;
}
levelWidth /= 2;
levelHeight /= 2;
dataSizesSum += mipDataSizes[i];
}
return dataSizesSum;
}
void TextureFormat::findExternalFormat()
{
bool found = false;
if (!found)
found = integerFormat();
if (!found)
found = nonIntegerFormat();
if (!found)
found = floatFormat();
if (!found)
found = compressedFormat();
#if defined(WITH_OPENGLES)
if (!found)
found = oesCompressedFormat();
#endif
FATAL_ASSERT_MSG(found, "Unknown internal format: 0x{:x}", internalFormat_);
//LOGD("Internal format: 0x{:x} - type: 0x{:x}", internalFormat_, type_);
}
bool TextureFormat::integerFormat()
{
bool found = true;
switch (internalFormat_) {
case GL_RGBA8:
case 4:
format_ = GL_RGBA;
break;
case GL_RGB8:
case 3:
format_ = GL_RGB;
break;
case GL_RG8:
case 2:
format_ = GL_RG;
break;
case GL_R8:
case 1:
format_ = GL_RED;
break;
case GL_DEPTH_COMPONENT16:
case GL_DEPTH_COMPONENT24:
format_ = GL_DEPTH_COMPONENT;
break;
default:
found = false;
break;
}
if (found) {
type_ = GL_UNSIGNED_BYTE;
}
return found;
}
bool TextureFormat::nonIntegerFormat()
{
bool found = true;
switch (internalFormat_) {
case GL_RGB5_A1:
format_ = GL_RGBA;
type_ = GL_UNSIGNED_SHORT_5_5_5_1;
break;
case GL_RGBA4:
format_ = GL_RGBA;
type_ = GL_UNSIGNED_SHORT_4_4_4_4;
break;
case GL_RGB565:
format_ = GL_RGB;
type_ = GL_UNSIGNED_SHORT_5_6_5;
break;
default:
found = false;
break;
}
return found;
}
bool TextureFormat::floatFormat()
{
bool found = true;
switch (internalFormat_) {
case GL_RGBA16F:
case GL_RGBA32F:
format_ = GL_RGBA;
break;
case GL_RGB16F:
case GL_RGB32F:
format_ = GL_RGB;
break;
case GL_DEPTH_COMPONENT32F:
format_ = GL_DEPTH_COMPONENT;
break;
default:
found = false;
break;
}
if (found) {
type_ = GL_FLOAT;
}
return found;
}
bool TextureFormat::compressedFormat()
{
bool found = true;
switch (internalFormat_) {
case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
format_ = GL_RGBA;
break;
case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
format_ = GL_RGB;
break;
default:
found = false;
break;
}
if (found) {
type_ = GL_UNSIGNED_BYTE;
isCompressed_ = true;
}
return found;
}
#if defined(WITH_OPENGLES)
bool TextureFormat::oesCompressedFormat()
{
bool found = true;
switch (internalFormat_) {
case GL_ATC_RGBA_EXPLICIT_ALPHA_AMD:
case GL_ATC_RGBA_INTERPOLATED_ALPHA_AMD:
case GL_COMPRESSED_RGBA_PVRTC_2BPPV1_IMG:
case GL_COMPRESSED_RGBA_PVRTC_4BPPV1_IMG:
case GL_COMPRESSED_RGBA8_ETC2_EAC:
case GL_COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_ETC2:
# if (!defined(DEATH_TARGET_ANDROID) && defined(WITH_OPENGLES)) || (defined(DEATH_TARGET_ANDROID) && __ANDROID_API__ >= 21)
case GL_COMPRESSED_RGBA_ASTC_4x4_KHR:
case GL_COMPRESSED_RGBA_ASTC_5x4_KHR:
case GL_COMPRESSED_RGBA_ASTC_5x5_KHR:
case GL_COMPRESSED_RGBA_ASTC_6x5_KHR:
case GL_COMPRESSED_RGBA_ASTC_6x6_KHR:
case GL_COMPRESSED_RGBA_ASTC_8x5_KHR:
case GL_COMPRESSED_RGBA_ASTC_8x6_KHR:
case GL_COMPRESSED_RGBA_ASTC_8x8_KHR:
case GL_COMPRESSED_RGBA_ASTC_10x5_KHR:
case GL_COMPRESSED_RGBA_ASTC_10x6_KHR:
case GL_COMPRESSED_RGBA_ASTC_10x8_KHR:
case GL_COMPRESSED_RGBA_ASTC_10x10_KHR:
case GL_COMPRESSED_RGBA_ASTC_12x10_KHR:
case GL_COMPRESSED_RGBA_ASTC_12x12_KHR:
# endif
format_ = GL_RGBA;
break;
case GL_ETC1_RGB8_OES:
case GL_COMPRESSED_RGB8_ETC2:
case GL_ATC_RGB_AMD:
case GL_COMPRESSED_RGB_PVRTC_2BPPV1_IMG:
case GL_COMPRESSED_RGB_PVRTC_4BPPV1_IMG:
format_ = GL_RGB;
break;
case GL_COMPRESSED_RG11_EAC:
format_ = GL_RG;
break;
case GL_COMPRESSED_R11_EAC:
format_ = GL_RED;
break;
default:
found = false;
break;
}
if (found) {
type_ = GL_UNSIGNED_BYTE;
isCompressed_ = true;
}
return found;
}
#endif
void TextureFormat::checkFormatSupport() const
{
const IGfxCapabilities& gfxCaps = theServiceLocator().GetGfxCapabilities();
switch (internalFormat_) {
case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
{
const bool hasS3tc = gfxCaps.HasExtension(IGfxCapabilities::GLExtensions::EXT_TEXTURE_COMPRESSION_S3TC);
FATAL_ASSERT_MSG(hasS3tc, "GL_EXT_texture_compression_s3tc not available");
break;
}
#if defined(WITH_OPENGLES)
case GL_ETC1_RGB8_OES:
{
const bool hasEct1 = gfxCaps.HasExtension(IGfxCapabilities::GLExtensions::OES_COMPRESSED_ETC1_RGB8_TEXTURE);
FATAL_ASSERT_MSG(hasEct1, "GL_OES_compressed_etc1_rgb8_texture not available");
break;
}
case GL_ATC_RGB_AMD:
case GL_ATC_RGBA_EXPLICIT_ALPHA_AMD:
case GL_ATC_RGBA_INTERPOLATED_ALPHA_AMD:
{
const bool hasAtc = gfxCaps.HasExtension(IGfxCapabilities::GLExtensions::AMD_COMPRESSED_ATC_TEXTURE);
FATAL_ASSERT_MSG(hasAtc, "GL_AMD_compressed_ATC_texture not available");
break;
}
case GL_COMPRESSED_RGB_PVRTC_2BPPV1_IMG:
case GL_COMPRESSED_RGBA_PVRTC_2BPPV1_IMG:
case GL_COMPRESSED_RGB_PVRTC_4BPPV1_IMG:
case GL_COMPRESSED_RGBA_PVRTC_4BPPV1_IMG:
{
const bool hasPvr = gfxCaps.HasExtension(IGfxCapabilities::GLExtensions::IMG_TEXTURE_COMPRESSION_PVRTC);
FATAL_ASSERT_MSG(hasPvr, "GL_IMG_texture_compression_pvrtc not available");
break;
}
# if (!defined(DEATH_TARGET_ANDROID) && defined(WITH_OPENGLES)) || (defined(DEATH_TARGET_ANDROID) && __ANDROID_API__ >= 21)
case GL_COMPRESSED_RGBA_ASTC_4x4_KHR:
case GL_COMPRESSED_RGBA_ASTC_5x4_KHR:
case GL_COMPRESSED_RGBA_ASTC_5x5_KHR:
case GL_COMPRESSED_RGBA_ASTC_6x5_KHR:
case GL_COMPRESSED_RGBA_ASTC_6x6_KHR:
case GL_COMPRESSED_RGBA_ASTC_8x5_KHR:
case GL_COMPRESSED_RGBA_ASTC_8x6_KHR:
case GL_COMPRESSED_RGBA_ASTC_8x8_KHR:
case GL_COMPRESSED_RGBA_ASTC_10x5_KHR:
case GL_COMPRESSED_RGBA_ASTC_10x6_KHR:
case GL_COMPRESSED_RGBA_ASTC_10x8_KHR:
case GL_COMPRESSED_RGBA_ASTC_10x10_KHR:
case GL_COMPRESSED_RGBA_ASTC_12x10_KHR:
case GL_COMPRESSED_RGBA_ASTC_12x12_KHR:
{
const bool hasAstc = gfxCaps.HasExtension(IGfxCapabilities::GLExtensions::KHR_TEXTURE_COMPRESSION_ASTC_LDR);
FATAL_ASSERT_MSG(hasAstc, "GL_KHR_texture_compression_astc_ldr not available");
break;
}
# endif
#endif
}
}
}
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