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4dd2b2216c
glVertexAttribPointer now accepts the GL 3.3 Core packed types GL_INT_/GL_UNSIGNED_INT_2_10_10_10_REV and the GL_BGRA size, clearing the two long-standing "// TODO: implement GL_BGRA support" markers. Adds the format end to end across the frontend, VAO state, and both backends. - DataType: add Int2101010Rev / Uint2101010Rev with GLToMG / MGToGL / MGToStr converter cases. - Validation (ValidateVertexAttribFormat): the full glVertexAttribPointer / glVertexAttribIPointer error table -- size is 1..4 or GL_BGRA (else INVALID_VALUE, which takes precedence); a packed type requires size 4 or GL_BGRA (else INVALID_OPERATION); GL_BGRA requires GL_UNSIGNED_BYTE or a packed type AND normalized == GL_TRUE (else INVALID_OPERATION); the integer path rejects packed types (INVALID_ENUM) and GL_BGRA size (INVALID_VALUE). - VAO: store GL_BGRA as size 4 plus a new IsBgra flag (reset on the binding-format path). - DirectVulkan: map the packed/BGRA formats to VK_FORMAT_A2B10G10R10_* (normal) and VK_FORMAT_A2R10G10B10_* / VK_FORMAT_B8G8R8A8_UNORM (BGRA reversed), fold IsBgra into the pipeline hash, and size packed/BGRA elements as one 4-byte word via GetAttributeByteSize. (Vulkan *_SNORM decodes with the GL 4.2 symmetric rule, a documented deviation from the 3.3 signed formula.) - DirectGLES: round-trip the packed enum through the loader, pass GL_BGRA as the driver size argument, and size client uploads with the packed 4-byte word. Tests: 4 VertexArrayTest cases covering packed/BGRA storage and the full float/integer error table; the packed-size hard-fail is mutation-verified. VertexArrayTest 42/42, SanityTest 30/30, library builds clean.