intel: Also get the DRI2 front buffer when doing front buffer reading.

[mesa.git] / src / mesa / drivers / dri / i965 / brw_clip_line.c

diff --git a/src/mesa/drivers/dri/i965/brw_clip_line.c b/src/mesa/drivers/dri/i965/brw_clip_line.c
index 0930e6a57393344ce07519b95d200bd4b851d4fc..d830e49e50ae7dddfec75394550d616e4c0e3443 100644 (file)
--- a/src/mesa/drivers/dri/i965/brw_clip_line.c
+++ b/src/mesa/drivers/dri/i965/brw_clip_line.c
@@ -29,11 +29,11 @@
   *   Keith Whitwell <keith@tungstengraphics.com>
   */
 
-#include "glheader.h"
-#include "macros.h"
-#include "enums.h"
-
+#include "main/glheader.h"
+#include "main/macros.h"
+#include "main/enums.h"
 #include "shader/program.h"
+
 #include "intel_batchbuffer.h"
 
 #include "brw_defines.h"
@@ -148,7 +148,7 @@ static void clip_and_emit_line( struct brw_clip_compile *c )
    brw_clip_init_clipmask(c);
 
    /* -ve rhw workaround */
-   if (!(BRW_IS_GM45(p->brw) || BRW_IS_G4X(p->brw))) {
+   if (!BRW_IS_G4X(p->brw)) {
       brw_set_conditionalmod(p, BRW_CONDITIONAL_NZ);
       brw_AND(p, brw_null_reg(), get_element_ud(c->reg.R0, 2),
               brw_imm_ud(1<<20));
@@ -181,34 +181,54 @@ static void clip_and_emit_line( struct brw_clip_compile *c )
         brw_DP4(p, vec4(c->reg.dp1), deref_4f(vtx1, c->offset[VERT_RESULT_HPOS]), c->reg.plane_equation);
         is_negative = brw_IF(p, BRW_EXECUTE_1);
         {
-           brw_ADD(p, c->reg.t, c->reg.dp1, negate(c->reg.dp0));
-           brw_math_invert(p, c->reg.t, c->reg.t);
-           brw_MUL(p, c->reg.t, c->reg.t, c->reg.dp1);
-
-           brw_CMP(p, vec1(brw_null_reg()), BRW_CONDITIONAL_G, c->reg.t, c->reg.t1 );
-           brw_MOV(p, c->reg.t1, c->reg.t);
-           brw_set_predicate_control(p, BRW_PREDICATE_NONE);
+             /*
+              * Both can be negative on GM965/G965 due to RHW workaround
+              * if so, this object should be rejected.
+              */
+             if (!BRW_IS_G4X(p->brw)) {
+                 brw_CMP(p, vec1(brw_null_reg()), BRW_CONDITIONAL_LE, c->reg.dp0, brw_imm_f(0.0));
+                 is_neg2 = brw_IF(p, BRW_EXECUTE_1);
+                 {
+                     brw_clip_kill_thread(c);
+                 }
+                 brw_ENDIF(p, is_neg2);
+             }
+
+             brw_ADD(p, c->reg.t, c->reg.dp1, negate(c->reg.dp0));
+             brw_math_invert(p, c->reg.t, c->reg.t);
+             brw_MUL(p, c->reg.t, c->reg.t, c->reg.dp1);
+
+             brw_CMP(p, vec1(brw_null_reg()), BRW_CONDITIONAL_G, c->reg.t, c->reg.t1 );
+             brw_MOV(p, c->reg.t1, c->reg.t);
+             brw_set_predicate_control(p, BRW_PREDICATE_NONE);
         } 
         is_negative = brw_ELSE(p, is_negative);
         {
-           /* Coming back in.  We know that both cannot be negative
-            * because the line would have been culled in that case.
-            */
+             /* Coming back in.  We know that both cannot be negative
+              * because the line would have been culled in that case.
+              */
+
+             /* If both are positive, do nothing */
+             /* Only on GM965/G965 */
+             if (!BRW_IS_G4X(p->brw)) {
+                 brw_CMP(p, vec1(brw_null_reg()), BRW_CONDITIONAL_L, c->reg.dp0, brw_imm_f(0.0));
+                 is_neg2 = brw_IF(p, BRW_EXECUTE_1);
+             }
 
-           /* If both are positive, do nothing */
-             brw_CMP(p, vec1(brw_null_reg()), BRW_CONDITIONAL_L, c->reg.dp0, brw_imm_f(0.0));
-             is_neg2 = brw_IF(p, BRW_EXECUTE_1);
              {
-               brw_ADD(p, c->reg.t, c->reg.dp0, negate(c->reg.dp1));
-               brw_math_invert(p, c->reg.t, c->reg.t);
-               brw_MUL(p, c->reg.t, c->reg.t, c->reg.dp0);
-
-               brw_CMP(p, vec1(brw_null_reg()), BRW_CONDITIONAL_G, c->reg.t, c->reg.t0 );
-               brw_MOV(p, c->reg.t0, c->reg.t);
-               brw_set_predicate_control(p, BRW_PREDICATE_NONE);
-            }
-            brw_ENDIF(p, is_neg2);
-        }
+                 brw_ADD(p, c->reg.t, c->reg.dp0, negate(c->reg.dp1));
+                 brw_math_invert(p, c->reg.t, c->reg.t);
+                 brw_MUL(p, c->reg.t, c->reg.t, c->reg.dp0);
+
+                 brw_CMP(p, vec1(brw_null_reg()), BRW_CONDITIONAL_G, c->reg.t, c->reg.t0 );
+                 brw_MOV(p, c->reg.t0, c->reg.t);
+                 brw_set_predicate_control(p, BRW_PREDICATE_NONE);
+             }
+
+             if (!BRW_IS_G4X(p->brw)) {
+                 brw_ENDIF(p, is_neg2);
+             }
+         }
         brw_ENDIF(p, is_negative);      
       }
       brw_ENDIF(p, plane_active);