- I915_STATECHANGE(i915, I915_UPLOAD_CTX);
- i915->state.Ctx[I915_CTXREG_LIS6] &= ~(S6_ALPHA_TEST_FUNC_MASK |
- S6_ALPHA_REF_MASK);
- i915->state.Ctx[I915_CTXREG_LIS6] |= ((test << S6_ALPHA_TEST_FUNC_SHIFT) |
- (((GLuint) refByte) <<
- S6_ALPHA_REF_SHIFT));
+ dw = i915->state.Ctx[I915_CTXREG_LIS6];
+ dw &= ~(S6_ALPHA_TEST_FUNC_MASK | S6_ALPHA_REF_MASK);
+ dw |= ((test << S6_ALPHA_TEST_FUNC_SHIFT) |
+ (((GLuint) refByte) << S6_ALPHA_REF_SHIFT));
+ if (dw != i915->state.Ctx[I915_CTXREG_LIS6]) {
+ i915->state.Ctx[I915_CTXREG_LIS6] = dw;
+ I915_STATECHANGE(i915, I915_UPLOAD_CTX);
+ }