fp-generic: Add alpha channel for a full RGBA visual

tests/shaders/fp-generic.c

@@ -242,7 +242,7 @@ int main(int argc, char *argv[])
 
 	glutInitWindowPosition(0, 0);
 	glutInitWindowSize(Width, Height);
-	glutInitDisplayMode(GLUT_RGBA | GLUT_DOUBLE);
+	glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_ALPHA);
 	glutCreateWindow(argv[0]);
 	glutReshapeFunc(Reshape);
 	glutDisplayFunc(Redisplay);

tests/shaders/generic/lrp_sat.fp

@@ -5,7 +5,7 @@ tc
 -0.5 4.5 3.5 1.0
 tex
 expected
- 0.25 0.5 0.5 1.0
+ 0.25 0.5 0.5 0.5
 
 !!ARBfp1.0
 TEMP r0;