+static bool
+compressed_format_compatible(const struct gl_context *ctx,
+ GLenum compressedFormat, GLenum otherFormat)
+{
+ enum mesa_block_class compressedClass, otherClass;
+
+ /* Two view-incompatible compressed formats are never compatible. */
+ if (_mesa_is_compressed_format(ctx, otherFormat)) {
+ return false;
+ }
+
+ /*
+ * From ARB_copy_image spec:
+ * Table 4.X.1 (Compatible internal formats for copying between
+ * compressed and uncompressed internal formats)
+ * ---------------------------------------------------------------------
+ * | Texel / | Uncompressed | |
+ * | Block | internal format | Compressed internal format |
+ * | size | | |
+ * ---------------------------------------------------------------------
+ * | 128-bit | RGBA32UI, | COMPRESSED_RGBA_S3TC_DXT3_EXT, |
+ * | | RGBA32I, | COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT,|
+ * | | RGBA32F | COMPRESSED_RGBA_S3TC_DXT5_EXT, |
+ * | | | COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT,|
+ * | | | COMPRESSED_RG_RGTC2, |
+ * | | | COMPRESSED_SIGNED_RG_RGTC2, |
+ * | | | COMPRESSED_RGBA_BPTC_UNORM, |
+ * | | | COMPRESSED_SRGB_ALPHA_BPTC_UNORM, |
+ * | | | COMPRESSED_RGB_BPTC_SIGNED_FLOAT, |
+ * | | | COMPRESSED_RGB_BPTC_UNSIGNED_FLOAT |
+ * ---------------------------------------------------------------------
+ * | 64-bit | RGBA16F, RG32F, | COMPRESSED_RGB_S3TC_DXT1_EXT, |
+ * | | RGBA16UI, RG32UI, | COMPRESSED_SRGB_S3TC_DXT1_EXT, |
+ * | | RGBA16I, RG32I, | COMPRESSED_RGBA_S3TC_DXT1_EXT, |
+ * | | RGBA16, | COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT,|
+ * | | RGBA16_SNORM | COMPRESSED_RED_RGTC1, |
+ * | | | COMPRESSED_SIGNED_RED_RGTC1 |
+ * ---------------------------------------------------------------------
+ */
+
+ switch (compressedFormat) {
+ case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
+ case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT:
+ case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
+ case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT:
+ case GL_COMPRESSED_RG_RGTC2:
+ case GL_COMPRESSED_SIGNED_RG_RGTC2:
+ case GL_COMPRESSED_RGBA_BPTC_UNORM:
+ case GL_COMPRESSED_SRGB_ALPHA_BPTC_UNORM:
+ case GL_COMPRESSED_RGB_BPTC_SIGNED_FLOAT:
+ case GL_COMPRESSED_RGB_BPTC_UNSIGNED_FLOAT:
+ compressedClass = BLOCK_CLASS_128_BITS;
+ break;
+ case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
+ case GL_COMPRESSED_SRGB_S3TC_DXT1_EXT:
+ case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
+ case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT:
+ case GL_COMPRESSED_RED_RGTC1:
+ case GL_COMPRESSED_SIGNED_RED_RGTC1:
+ compressedClass = BLOCK_CLASS_64_BITS;
+ break;
+ case GL_COMPRESSED_RGBA8_ETC2_EAC:
+ case GL_COMPRESSED_SRGB8_ALPHA8_ETC2_EAC:
+ case GL_COMPRESSED_RG11_EAC:
+ case GL_COMPRESSED_SIGNED_RG11_EAC:
+ if (_mesa_is_gles(ctx))
+ compressedClass = BLOCK_CLASS_128_BITS;
+ else
+ return false;
+ break;
+ case GL_COMPRESSED_RGB8_ETC2:
+ case GL_COMPRESSED_SRGB8_ETC2:
+ case GL_COMPRESSED_R11_EAC:
+ case GL_COMPRESSED_SIGNED_R11_EAC:
+ case GL_COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_ETC2:
+ case GL_COMPRESSED_SRGB8_PUNCHTHROUGH_ALPHA1_ETC2:
+ if (_mesa_is_gles(ctx))
+ compressedClass = BLOCK_CLASS_64_BITS;
+ else
+ return false;
+ break;
+ default:
+ if (_mesa_is_gles(ctx) && _mesa_is_astc_format(compressedFormat))
+ compressedClass = BLOCK_CLASS_128_BITS;
+ else
+ return false;
+ break;
+ }
+
+ switch (otherFormat) {
+ case GL_RGBA32UI:
+ case GL_RGBA32I:
+ case GL_RGBA32F:
+ otherClass = BLOCK_CLASS_128_BITS;
+ break;
+ case GL_RGBA16F:
+ case GL_RG32F:
+ case GL_RGBA16UI:
+ case GL_RG32UI:
+ case GL_RGBA16I:
+ case GL_RG32I:
+ case GL_RGBA16:
+ case GL_RGBA16_SNORM:
+ otherClass = BLOCK_CLASS_64_BITS;
+ break;
+ default:
+ return false;
+ }
+
+ return compressedClass == otherClass;
+}
+
+static bool
+copy_format_compatible(const struct gl_context *ctx,
+ GLenum srcFormat, GLenum dstFormat)
+{
+ /*
+ * From ARB_copy_image spec:
+ * For the purposes of CopyImageSubData, two internal formats
+ * are considered compatible if any of the following conditions are
+ * met:
+ * * the formats are the same,
+ * * the formats are considered compatible according to the
+ * compatibility rules used for texture views as defined in
+ * section 3.9.X. In particular, if both internal formats are listed
+ * in the same entry of Table 3.X.2, they are considered compatible, or
+ * * one format is compressed and the other is uncompressed and
+ * Table 4.X.1 lists the two formats in the same row.
+ */
+
+ if (_mesa_texture_view_compatible_format(ctx, srcFormat, dstFormat)) {
+ /* Also checks if formats are equal. */
+ return true;
+ } else if (_mesa_is_compressed_format(ctx, srcFormat)) {
+ return compressed_format_compatible(ctx, srcFormat, dstFormat);
+ } else if (_mesa_is_compressed_format(ctx, dstFormat)) {
+ return compressed_format_compatible(ctx, dstFormat, srcFormat);
+ }
+
+ return false;
+}
+
+void GLAPIENTRY