commit f2ed299569c0075e83c8f42e44345ffada9231b9
author Olli Etuaho <oetuaho@nvidia.com> Thu Oct 04 13:54:42 2018 +0300
committer Commit Bot <commit-bot@chromium.org> Thu Oct 11 22:25:21 2018 +0000
tree bc359dacc92a57523aa1ae220096c8acadb5dd6e
parent 956ab4d9fab36be9929e63829475d4d69b2c681c

Add support for EXT_texture_compression_bptc

After validation, the enums are simply forwarded to the native
drivers. The BPTC formats are supported on both OpenGL and D3D.

The included test coverage covers the API quite well, but only has
basic coverage for correct decoding of texture data. More coverage for
texture data could be added later.

BUG=angleproject:2869
TEST=angle_end2end_tests

Change-Id: I3de37972dcf13c6fa3fc1bc429a2627523a4a082
Reviewed-on: https://chromium-review.googlesource.com/c/1261675
Commit-Queue: Geoff Lang <geofflang@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>

src/libANGLE/formatutils.cpp

diff --git a/src/libANGLE/formatutils.cpp b/src/libANGLE/formatutils.cpp
index 1ba6ec2..83c2716 100644
--- a/src/libANGLE/formatutils.cpp
+++ b/src/libANGLE/formatutils.cpp
@@ -894,6 +894,13 @@
     AddCompressedFormat(&map, GL_COMPRESSED_SRGB8_ALPHA8_ASTC_12x10_KHR, 12, 10, 128, 4, GL_RGBA, GL_UNSIGNED_BYTE, true,  RequireExtOrExt<&Extensions::textureCompressionASTCHDR, &Extensions::textureCompressionASTCLDR>, AlwaysSupported, NeverSupported,      NeverSupported);
     AddCompressedFormat(&map, GL_COMPRESSED_SRGB8_ALPHA8_ASTC_12x12_KHR, 12, 12, 128, 4, GL_RGBA, GL_UNSIGNED_BYTE, true,  RequireExtOrExt<&Extensions::textureCompressionASTCHDR, &Extensions::textureCompressionASTCLDR>, AlwaysSupported, NeverSupported,      NeverSupported);
 
+    // From EXT_texture_compression_bptc
+    //                       | Internal format                         | W | H | BS |CC| Format | Type            | SRGB | Texture supported                              | Filterable     | Texture attachment | Renderbuffer |
+    AddCompressedFormat(&map, GL_COMPRESSED_RGBA_BPTC_UNORM_EXT,         4,  4, 128, 4, GL_RGBA, GL_UNSIGNED_BYTE, false, RequireExt<&Extensions::textureCompressionBPTC>, AlwaysSupported, NeverSupported,      NeverSupported);
+    AddCompressedFormat(&map, GL_COMPRESSED_SRGB_ALPHA_BPTC_UNORM_EXT,   4,  4, 128, 4, GL_RGBA, GL_UNSIGNED_BYTE, true,  RequireExt<&Extensions::textureCompressionBPTC>, AlwaysSupported, NeverSupported,      NeverSupported);
+    AddCompressedFormat(&map, GL_COMPRESSED_RGB_BPTC_SIGNED_FLOAT_EXT,   4,  4, 128, 4, GL_RGB,  GL_FLOAT,         false, RequireExt<&Extensions::textureCompressionBPTC>, AlwaysSupported, NeverSupported,      NeverSupported);
+    AddCompressedFormat(&map, GL_COMPRESSED_RGB_BPTC_UNSIGNED_FLOAT_EXT, 4,  4, 128, 4, GL_RGB,  GL_FLOAT,         false, RequireExt<&Extensions::textureCompressionBPTC>, AlwaysSupported, NeverSupported,      NeverSupported);
+
     // For STENCIL_INDEX8 we chose a normalized component type for the following reasons:
     // - Multisampled buffer are disallowed for non-normalized integer component types and we want to support it for STENCIL_INDEX8
     // - All other stencil formats (all depth-stencil) are either float or normalized