Invalidate current fastpath on changes to attribute size or offset within

the vertex.

Use existing facilities to check for sse2 and enable when available.

Turn on SSE/SSE2 codegen for t_vertex.c by default when USE_SSE_ASM is
defined.  Disable with "MESA_NO_CODEGEN=t".

src/mesa/tnl/t_context.h

@@ -570,7 +570,9 @@ struct tnl_clipspace_fastpath {
 
    struct {
       GLuint format;
+      GLuint size;
       GLuint stride;
+      GLuint offset;
    } *attr;
 
    tnl_emit_func func;

src/mesa/tnl/t_vertex.c

@@ -46,7 +46,9 @@ static GLboolean match_fastpath( struct tnl_clipspace *vtx,
       return GL_FALSE;
 
    for (j = 0; j < vtx->attr_count; j++) 
-      if (vtx->attr[j].format != fp->attr[j].format) 
+      if (vtx->attr[j].format != fp->attr[j].format ||
+	  vtx->attr[j].inputsize != fp->attr[j].size ||
+	  vtx->attr[j].vertoffset != fp->attr[j].offset) 
 	 return GL_FALSE;
       
    if (fp->match_strides) {
@@ -90,6 +92,8 @@ void _tnl_register_fastpath( struct tnl_clipspace *vtx,
    for (i = 0; i < vtx->attr_count; i++) {
       fastpath->attr[i].format = vtx->attr[i].format;
       fastpath->attr[i].stride = vtx->attr[i].inputstride;
+      fastpath->attr[i].size = vtx->attr[i].inputsize;
+      fastpath->attr[i].offset = vtx->attr[i].vertoffset;
    }
 
    fastpath->next = vtx->fastpath;
@@ -470,8 +474,8 @@ void _tnl_init_vertices( GLcontext *ctx,
 
    vtx->codegen_emit = NULL;
 
-#ifdef __i386__
-   if (getenv("MESA_EXPERIMENTAL"))
+#ifdef USE_SSE_ASM
+   if (!_mesa_getenv("MESA_NO_CODEGEN"))
       vtx->codegen_emit = _tnl_generate_sse_emit;
 #endif
 }

src/mesa/tnl/t_vertex_sse.c

@@ -33,12 +33,14 @@
 #include "simple_list.h"
 #include "enums.h"
 
+#if defined(USE_X86_ASM)
+
 #define X    0
 #define Y    1
 #define Z    2
 #define W    3
 
-#define DISASSEM 1
+#define DISASSEM 0
 
 struct x86_reg {
    GLuint file:3;
@@ -1208,18 +1210,26 @@ static GLboolean build_vertex_emit( struct x86_program *p )
    return GL_TRUE;
 }
 
+#include "x86/common_x86_asm.h"
+
+
 void _tnl_generate_sse_emit( GLcontext *ctx )
 {
    struct tnl_clipspace *vtx = GET_VERTEX_STATE(ctx);
    struct x86_program p;   
 
+   if (!cpu_has_xmm) {
+      vtx->codegen_emit = NULL;
+      return;
+   }
+
    memset(&p, 0, sizeof(p));
    p.ctx = ctx;
    p.store = MALLOC(1024);
 
-   p.inputs_safe = 1;		/* for now */
+   p.inputs_safe = 0;		/* for now */
    p.outputs_safe = 1;		/* for now */
-   p.have_sse2 = 1;		/* testing */
+   p.have_sse2 = cpu_has_xmm2;
    p.identity = make_reg(file_XMM, 6);
    p.chan0 = make_reg(file_XMM, 7);
 
@@ -1246,3 +1256,12 @@ void _tnl_generate_sse_emit( GLcontext *ctx )
    (void)sse2_packsswb;
    (void)sse2_pshufd;
 }
+
+#else
+
+void _tnl_generate_sse_emit( GLcontext *ctx )
+{
+   /* Dummy version for when USE_SSE_ASM not defined */
+}
+
+#endif