ABB 48990001-LY DSSA 165 Remote I/o module

• Body: One to four Dwords, as defined by the table: [Image Opcodes with Sampler] Address components are X,Y,Z,W with X in VGPR_M, Y in VGPR_M+1, etc. The number of components in "body" is the value of the ACNT field in the table, plus one. • Data: Written from, or returned to, one to four consecutive VGPRs. The amount of data read or written is determined by the DMASK field of the instruction. • Reads: DMASK specifies which elements of the resource are returned to consecutive VGPRs. The texture system reads data from memory and based on the data format expands it to a canonical RGBA form, filling in zero or one for missing components. Then, DMASK is applied, and only those components selected are returned to the shader.

• Writes: When writing an image object

it is only possible to write an entire element (all components), not just individual components. The components come from consecutive VGPRs, and the texture system fills in the value zero for any missing components of the image’s data format; it ignores any values that are not part of the stored data format. For example, if the DMASK=1001, the shader sends Red from VGPR_N, and Alpha from VGPR_N+1, to the texture unit. If the image object is RGB, the texel is overwritten with Red from the VGPR_N, Green and Blue set to zero, and Alpha from the shader ignored.

• Atomics

Image atomic operations are supported only on 32- and 64-bit-per pixel surfaces. The surface data format is specified in the resource constant. Atomic operations treat the element as a single component of 32- or 64-bits. For atomic operations, DMASK is set to the number of VGPRs (Dwords) to send to the texture unit. DMASK legal values for atomic image operations: no other values of DMASK are legal. 0x1 = 32-bit atomics except cmpswap. 0x3 = 32-bit atomic cmpswap. 0x3 = 64-bit atomics except cmpswap. 0xf = 64-bit atomic cmpswap. • Atomics with Return: Data is read out of the VGPR(s), starting at VDATA, to supply to the atomic operation. If the atomic returns a value to VGPRs, that data is returned to those same VGPRs starting at VDATA.

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