svga: implement generic variable index remapping

The state tracker may generate shaders that use generic vs outputs /
fs inputs like:

DCL IN[0], GENERIC[0]
DCL IN[1], GENERIC[10]
DCL IN[2], GENERIC[11]

This patch remaps 0, 10, 11 to small integers like 1, 2, 3 so that we
stay inside the SVGA3D limit (8).

The remapping is done to both the vertex shader outputs and the
fragment shader inputs.  The same mapping must be used for a vs/fs
pair.

Note that 'union svga_compile_key' is now 'struct svga_compile_key'
because we needed to add the register remapping table.  The change in
size isn't really significant though (it's not a search key).

Also, add assertions when building up SVGA3D src/dst registers to we
don't try to store too large of value for the bitfield size.

Reviewed-by: José Fonseca <jfonseca@vmware.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/src/gallium/drivers/svga/svga_context.h b/src/gallium/drivers/svga/svga_context.h
index 47e08ba..86e5f23 100644
--- a/src/gallium/drivers/svga/svga_context.h
+++ b/src/gallium/drivers/svga/svga_context.h
@@ -36,6 +36,7 @@
 #include "tgsi/tgsi_scan.h"
 
 #include "svga_state.h"
+#include "svga_tgsi.h"
 #include "svga_hw_reg.h"
 #include "svga3d_shaderdefs.h"
 
@@ -66,6 +67,11 @@ struct svga_shader
 struct svga_fragment_shader
 {
    struct svga_shader base;
+
+   /** Mask of which generic varying variables are read by this shader */
+   unsigned generic_inputs;
+   /** Table mapping original TGSI generic indexes to low integers */
+   int8_t generic_remap_table[MAX_GENERIC_VARYING];
 };
 
 struct svga_vertex_shader