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Added support for ETC1 and PVR1 compressed textures contained in KTX, PKM, and PVR files.

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Most desktop graphics drivers don't support those formats.

--HG--
branch : minor
This commit is contained in:
Alex Szpakowski
2015-01-20 03:18:28 -04:00
parent 319ccc2f25
commit dfdd52e499
21 changed files with 1136 additions and 340 deletions
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src/modules/graphics/opengl/Image.cpp
+22
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@@ -507,6 +507,20 @@ GLenum Image::getCompressedFormat(image::CompressedData::Format cformat) const
return GL_COMPRESSED_RGBA_BPTC_UNORM;
case image::CompressedData::FORMAT_BC7SRGB:
return GL_COMPRESSED_SRGB_ALPHA_BPTC_UNORM;
case image::CompressedData::FORMAT_ETC1:
// The ETC2 format can load ETC1 textures.
if (GLAD_ES_VERSION_3_0 || GLAD_VERSION_4_3 || GLAD_ARB_ES3_compatibility)
return GL_COMPRESSED_RGB8_ETC2;
else
return GL_ETC1_RGB8_OES;
case image::CompressedData::FORMAT_PVR1_RGB2:
return GL_COMPRESSED_RGB_PVRTC_2BPPV1_IMG;
case image::CompressedData::FORMAT_PVR1_RGB4:
return GL_COMPRESSED_RGB_PVRTC_4BPPV1_IMG;
case image::CompressedData::FORMAT_PVR1_RGBA2:
return GL_COMPRESSED_RGBA_PVRTC_2BPPV1_IMG;
case image::CompressedData::FORMAT_PVR1_RGBA4:
return GL_COMPRESSED_RGBA_PVRTC_4BPPV1_IMG;
default:
if (flags.sRGB)
return GL_SRGB8_ALPHA8;
@@ -540,6 +554,14 @@ bool Image::hasCompressedTextureSupport(image::CompressedData::Format format)
case image::CompressedData::FORMAT_BC7:
case image::CompressedData::FORMAT_BC7SRGB:
return GLAD_VERSION_4_2 || GLAD_ARB_texture_compression_bptc;
case image::CompressedData::FORMAT_ETC1:
// ETC2 support guarantees ETC1 support as well.
return GLAD_ES_VERSION_3_0 || GLAD_VERSION_4_3 || GLAD_ARB_ES3_compatibility || GLAD_OES_compressed_ETC1_RGB8_texture;
case image::CompressedData::FORMAT_PVR1_RGB2:
case image::CompressedData::FORMAT_PVR1_RGB4:
case image::CompressedData::FORMAT_PVR1_RGBA2:
case image::CompressedData::FORMAT_PVR1_RGBA4:
return GLAD_IMG_texture_compression_pvrtc;
default:
return false;
}