Changes between Version 12 and Version 13 of GcnInstrsMimg

Timestamp:

01/17/16 15:00:19 (8 years ago)

Author:

trac

Comment:

--

GcnInstrsMimg

@@ -1376 +1376 @@
     ((UINT*)VM)[i] = VDATA[i] ^ ((UINT*)VM)[i]
 VDATA = (GLC) ? P : VDATA // atomic</code></p>
+<h4>IMAGE_GATHER4</h4>
+<p>Opcode: 64 (0x40)<br />
+Syntax: IMAGE_GATHER4 VDATA(4), VADDR(1:4), SRSRC(4,8), SSAMP(4)<br />
+Description: Get component's value from 4 neighboring pixels, that closest to choosen
+coordinates in VADDR. Choosen component is first one bit in DMASK. The left top pixel are
+choosen from FLOOR(X-0.5) for X coordinate, FLOOR(Y-0.5) for Y coordinate.
+Following VDATA registers stores:</p>
+<ul>
+<li>VDATA[0] - bottom left pixel's component (X,Y+1)</li>
+<li>VDATA[1] - bottom right pixel's component (X+1,Y+1)</li>
+<li>VDATA[0] - top right pixel's component (X+1,Y)</li>
+<li>VDATA[1] - top left  pixel's component (X,Y)</li>
+</ul>
+<p>Operation:<br />
+<code>INT X = FLOOR(ASFLOAT(VADDR[0])-0.5)
+INT Y = FLOOR(ASFLOAT(VADDR[1])-0.5)
+COMPTYPE* VMLT = VMIMG_SAMPLE(SRSRC, { X, Y, VADDR[2] }, SSAMP)
+COMPTYPE* VMRT = VMIMG_SAMPLE(SRSRC, { X+1 Y, VADDR[2] }, SSAMP)
+COMPTYPE* VMLB = VMIMG_SAMPLE(SRSRC, { X, Y+1, VADDR[2] }, SSAMP)
+COMPTYPE* VMRB = VMIMG_SAMPLE(SRSRC, { X+1, Y+1, VADDR[2] }, SSAMP)
+BYTE COMP = (DMASK&amp;1) ? 0 : (DMASK&amp;2) ? 1 : (DMASK&amp;4) ? 2 : 3;
+VDATA[0] = CONVERT_FROM_IMAGE(SRSRC, VMLB)[COMP]
+VDATA[1] = CONVERT_FROM_IMAGE(SRSRC, VMRB)[COMP]
+VDATA[2] = CONVERT_FROM_IMAGE(SRSRC, VMRT)[COMP]
+VDATA[3] = CONVERT_FROM_IMAGE(SRSRC, VMLT)[COMP]</code></p>
 <h4>IMAGE_LOAD</h4>
 <p>Opcode: 0 (0x0)<br />