wined3d: Fix D3DSIO_TEXKILL for GLSL

[Jason Green]

The sample I implemented this with only worked by chance.

This fix uses the destination register instead of the source0 register.
Also, it uses builtin GLSL functions instead of expanding it out to
multiple compares.
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diff --git a/dlls/wined3d/glsl_shader.c b/dlls/wined3d/glsl_shader.c
index d7ec6a2..e7ba349 100644
--- a/dlls/wined3d/glsl_shader.c
+++ b/dlls/wined3d/glsl_shader.c
@@ -1364,10 +1364,10 @@ void pshader_glsl_texbem(SHADER_OPCODE_A
  * If any of the first 3 components are < 0, discard this pixel */
 void pshader_glsl_texkill(SHADER_OPCODE_ARG* arg) {
 
-    char src0_str[100], src0_name[50], src0_mask[6];
+    char dst_str[100], dst_name[50], dst_mask[6];
 
-    shader_glsl_add_param(arg, arg->src[0], arg->src_addr[0], TRUE, src0_name, src0_mask, src0_str);
-    shader_addline(arg->buffer, "if (%s.x < 0.0 || %s.y < 0.0 || %s.z < 0.0) discard;\n", src0_name, src0_name, src0_name);
+    shader_glsl_add_param(arg, arg->dst, 0, FALSE, dst_name, dst_mask, dst_str);
+    shader_addline(arg->buffer, "if (any(lessThan(%s.xyz, vec3(0.0)))) discard;\n", dst_name);
 }
 
 /** Process the D3DSIO_DP2ADD instruction in GLSL.