[Mesa-dev] [PATCH v2] mesa: Fix fixed function spot lighting on newer hardware (again)

[Daniel Scharrer]

This was first fixed in commit b3f9c5c and then broken again in commit
fe2d2c7, which removed the abs modifier from input registers.

v2: Don't change the size of struct ureg.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=91342
Signed-off-by: Daniel Scharrer <daniel at constexpr.org>
Cc: "12.0" <mesa-stable at lists.freedesktop.org>
---
 src/mesa/main/ffvertex_prog.c | 16 +++-------------
 1 file changed, 3 insertions(+), 13 deletions(-)

diff --git a/src/mesa/main/ffvertex_prog.c b/src/mesa/main/ffvertex_prog.c
index f4ae690..eff1cf6 100644
--- a/src/mesa/main/ffvertex_prog.c
+++ b/src/mesa/main/ffvertex_prog.c
@@ -297,10 +297,9 @@ struct ureg {
    GLuint file:4;
    GLint idx:9;      /* relative addressing may be negative */
                      /* sizeof(idx) should == sizeof(prog_src_reg::Index) */
-   GLuint abs:1;
    GLuint negate:1;
    GLuint swz:12;
-   GLuint pad:5;
+   GLuint pad:6;
 };
 
 
@@ -348,7 +347,6 @@ static struct ureg make_ureg(GLuint file, GLint idx)
    struct ureg reg;
    reg.file = file;
    reg.idx = idx;
-   reg.abs = 0;
    reg.negate = 0;
    reg.swz = SWIZZLE_NOOP;
    reg.pad = 0;
@@ -356,15 +354,6 @@ static struct ureg make_ureg(GLuint file, GLint idx)
 }
 
 
-
-static struct ureg absolute( struct ureg reg )
-{
-   reg.abs = 1;
-   reg.negate = 0;
-   return reg;
-}
-
-
 static struct ureg negate( struct ureg reg )
 {
    reg.negate ^= 1;
@@ -965,7 +954,8 @@ static struct ureg calculate_light_attenuation( struct tnl_program *p,
 
       emit_op2(p, OPCODE_DP3, spot, 0, negate(VPpli), spot_dir_norm);
       emit_op2(p, OPCODE_SLT, slt, 0, swizzle1(spot_dir_norm,W), spot);
-      emit_op2(p, OPCODE_POW, spot, 0, absolute(spot), swizzle1(attenuation, W));
+      emit_op1(p, OPCODE_ABS, spot, 0, spot);
+      emit_op2(p, OPCODE_POW, spot, 0, spot, swizzle1(attenuation, W));
       emit_op2(p, OPCODE_MUL, att, 0, slt, spot);
 
       release_temp(p, spot);
-- 
2.9.2