[PATCH vkd3d v3 2/8] vkd3d-shader: Read constant buffer offsets from the second index.

[Zebediah Figura]

Signed-off-by: Zebediah Figura 
---
v3: Emit 0 for idx[1], instead of copying idx[0].

libs/vkd3d-shader/dxbc.c  | 8 ++++++++
 libs/vkd3d-shader/spirv.c | 2 +-
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/libs/vkd3d-shader/dxbc.c b/libs/vkd3d-shader/dxbc.c
index 5156074..7f56019 100644
--- a/libs/vkd3d-shader/dxbc.c
+++ b/libs/vkd3d-shader/dxbc.c
@@ -1603,6 +1603,14 @@ static bool shader_sm4_read_param(struct vkd3d_sm4_data *priv, const DWORD **ptr
                 break;
         }
     }
+    else if (register_type == VKD3D_SM4_RT_CONSTBUFFER && order == 2)
+    {
+        /* SM5.1 places the buffer offset in idx[2]; earlier versions place it
+         * in idx[1]. Normalize to SM5.1. */
+        param->idx[2] = param->idx[1];
+        param->idx[1].rel_addr = NULL;
+        param->idx[1].offset = 0;
+    }

map_register(priv, param);

diff --git a/libs/vkd3d-shader/spirv.c b/libs/vkd3d-shader/spirv.c
index 0d4812b..a3cc5f9 100644
--- a/libs/vkd3d-shader/spirv.c
+++ b/libs/vkd3d-shader/spirv.c
@@ -2832,7 +2832,7 @@ static void vkd3d_dxbc_compiler_emit_dereference_register(struct vkd3d_dxbc_comp
     {
         assert(!reg->idx[0].rel_addr);
         indexes[index_count++] = vkd3d_dxbc_compiler_get_constant_uint(compiler, register_info->member_idx);
-        indexes[index_count++] = vkd3d_dxbc_compiler_emit_register_addressing(compiler, &reg->idx[1]);
+        indexes[index_count++] = vkd3d_dxbc_compiler_emit_register_addressing(compiler, &reg->idx[2]);
     }
     else if (reg->type == VKD3DSPR_IMMCONSTBUFFER)
     {