+ GLuint front_ref, front_writemask, front_mask;
+ GLenum front_func, front_fail, front_pass_z_fail, front_pass_z_pass;
+ GLuint back_ref, back_writemask, back_mask;
+ GLenum back_func, back_fail, back_pass_z_fail, back_pass_z_pass;
+ GLuint dirty = 0;
+
+ /* The 915 considers CW to be "front" for two-sided stencil, so choose
+ * appropriately.
+ */
+ /* _NEW_POLYGON | _NEW_STENCIL */
+ if (ctx->Polygon.FrontFace == GL_CW) {
+ front_ref = ctx->Stencil.Ref[0];
+ front_mask = ctx->Stencil.ValueMask[0];
+ front_writemask = ctx->Stencil.WriteMask[0];
+ front_func = ctx->Stencil.Function[0];
+ front_fail = ctx->Stencil.FailFunc[0];
+ front_pass_z_fail = ctx->Stencil.ZFailFunc[0];
+ front_pass_z_pass = ctx->Stencil.ZPassFunc[0];
+ back_ref = ctx->Stencil.Ref[ctx->Stencil._BackFace];
+ back_mask = ctx->Stencil.ValueMask[ctx->Stencil._BackFace];
+ back_writemask = ctx->Stencil.WriteMask[ctx->Stencil._BackFace];
+ back_func = ctx->Stencil.Function[ctx->Stencil._BackFace];
+ back_fail = ctx->Stencil.FailFunc[ctx->Stencil._BackFace];
+ back_pass_z_fail = ctx->Stencil.ZFailFunc[ctx->Stencil._BackFace];
+ back_pass_z_pass = ctx->Stencil.ZPassFunc[ctx->Stencil._BackFace];
+ } else {
+ front_ref = ctx->Stencil.Ref[ctx->Stencil._BackFace];
+ front_mask = ctx->Stencil.ValueMask[ctx->Stencil._BackFace];
+ front_writemask = ctx->Stencil.WriteMask[ctx->Stencil._BackFace];
+ front_func = ctx->Stencil.Function[ctx->Stencil._BackFace];
+ front_fail = ctx->Stencil.FailFunc[ctx->Stencil._BackFace];
+ front_pass_z_fail = ctx->Stencil.ZFailFunc[ctx->Stencil._BackFace];
+ front_pass_z_pass = ctx->Stencil.ZPassFunc[ctx->Stencil._BackFace];
+ back_ref = ctx->Stencil.Ref[0];
+ back_mask = ctx->Stencil.ValueMask[0];
+ back_writemask = ctx->Stencil.WriteMask[0];
+ back_func = ctx->Stencil.Function[0];
+ back_fail = ctx->Stencil.FailFunc[0];
+ back_pass_z_fail = ctx->Stencil.ZFailFunc[0];
+ back_pass_z_pass = ctx->Stencil.ZPassFunc[0];
+ }
+#define set_ctx_bits(reg, mask, set) do{ \
+ GLuint dw = i915->state.Ctx[reg]; \
+ dw &= ~(mask); \
+ dw |= (set); \
+ dirty |= dw != i915->state.Ctx[reg]; \
+ i915->state.Ctx[reg] = dw; \
+} while(0)
+
+ /* Set front state. */
+ set_ctx_bits(I915_CTXREG_STATE4,
+ MODE4_ENABLE_STENCIL_TEST_MASK |
+ MODE4_ENABLE_STENCIL_WRITE_MASK,
+ ENABLE_STENCIL_TEST_MASK |
+ ENABLE_STENCIL_WRITE_MASK |
+ STENCIL_TEST_MASK(front_mask) |
+ STENCIL_WRITE_MASK(front_writemask));
+
+ set_ctx_bits(I915_CTXREG_LIS5,
+ S5_STENCIL_REF_MASK |
+ S5_STENCIL_TEST_FUNC_MASK |
+ S5_STENCIL_FAIL_MASK |
+ S5_STENCIL_PASS_Z_FAIL_MASK |
+ S5_STENCIL_PASS_Z_PASS_MASK,
+ (front_ref << S5_STENCIL_REF_SHIFT) |
+ (intel_translate_compare_func(front_func) << S5_STENCIL_TEST_FUNC_SHIFT) |
+ (intel_translate_stencil_op(front_fail) << S5_STENCIL_FAIL_SHIFT) |
+ (intel_translate_stencil_op(front_pass_z_fail) <<
+ S5_STENCIL_PASS_Z_FAIL_SHIFT) |
+ (intel_translate_stencil_op(front_pass_z_pass) <<
+ S5_STENCIL_PASS_Z_PASS_SHIFT));
+
+ /* Set back state if different from front. */
+ if (ctx->Stencil._TestTwoSide) {
+ set_ctx_bits(I915_CTXREG_BF_STENCIL_OPS,
+ BFO_STENCIL_REF_MASK |
+ BFO_STENCIL_TEST_MASK |
+ BFO_STENCIL_FAIL_MASK |
+ BFO_STENCIL_PASS_Z_FAIL_MASK |
+ BFO_STENCIL_PASS_Z_PASS_MASK,
+ BFO_STENCIL_TWO_SIDE |
+ (back_ref << BFO_STENCIL_REF_SHIFT) |
+ (intel_translate_compare_func(back_func) << BFO_STENCIL_TEST_SHIFT) |
+ (intel_translate_stencil_op(back_fail) << BFO_STENCIL_FAIL_SHIFT) |
+ (intel_translate_stencil_op(back_pass_z_fail) <<
+ BFO_STENCIL_PASS_Z_FAIL_SHIFT) |
+ (intel_translate_stencil_op(back_pass_z_pass) <<
+ BFO_STENCIL_PASS_Z_PASS_SHIFT));
+
+ set_ctx_bits(I915_CTXREG_BF_STENCIL_MASKS,
+ BFM_STENCIL_TEST_MASK_MASK |
+ BFM_STENCIL_WRITE_MASK_MASK,
+ BFM_STENCIL_TEST_MASK(back_mask) |
+ BFM_STENCIL_WRITE_MASK(back_writemask));
+ } else {
+ set_ctx_bits(I915_CTXREG_BF_STENCIL_OPS,
+ BFO_STENCIL_TWO_SIDE, 0);
+ }