[ATOM][RHI][Vulkan] - add different constant alignment values for pla… (#4098)

* [ATOM][RHI][Vulkan] - add different constant alignment values for platforms. Signed-off-by: Peng <tonypeng@amazon.com> * More explanation of the limitation define. Signed-off-by: Peng <tonypeng@amazon.com>
2021-09-21 10:54:50 -07:00
parent 19747cb5c6
commit 612ba040a6
2 changed files with 11 additions and 2 deletions
@@ -16,6 +16,11 @@

 static const float4 s_AzslDebugColor = float4(165.0 / 255.0, 30.0 / 255.0, 36.0 / 255.0, 1);

-// Uniform limitation need to be taken into consideration for mobile devices
+// Uniform limitation need to be taken into consideration for mobile devices. This would help alleviate device lost errors if the constant buffer
+// size overshoots the device's memory constraints. An example is a large number of constant buffers associated with mesh instances that would result in device lost,
+// but otherwise OK on PC. We can separate out the number of instances for the different platforms with this define.
 // [ATOM-14949]
-#define AZ_TRAIT_CONSTANT_BUFFER_LIMITATIONS 1
+#define AZ_TRAIT_CONSTANT_BUFFER_LIMITATIONS 1
+
+// Different constant buffer alignment on platforms
+#define AZ_TRAIT_CONSTANT_BUFFER_ALIGNMENT      16
@@ -12,3 +12,7 @@
 */

 static const float4 s_AzslDebugColor = float4(165.0 / 255.0, 30.0 / 255.0, 36.0 / 255.0, 1);
+
+
+// Different constant buffer alignment on platforms
+#define AZ_TRAIT_CONSTANT_BUFFER_ALIGNMENT      128