intel: Replace IS_965 checks with context structure usage.

Saves another 600 bytes or so of code.

src/mesa/drivers/dri/i965/brw_clip_line.c

@@ -127,6 +127,7 @@ static void brw_clip_line_alloc_regs( struct brw_clip_compile *c )
 static void clip_and_emit_line( struct brw_clip_compile *c )
 {
    struct brw_compile *p = &c->func;
+   struct brw_context *brw = p->brw;
    struct brw_indirect vtx0     = brw_indirect(0, 0);
    struct brw_indirect vtx1      = brw_indirect(1, 0);
    struct brw_indirect newvtx0   = brw_indirect(2, 0);
@@ -153,7 +154,7 @@ static void clip_and_emit_line( struct brw_clip_compile *c )
    brw_clip_init_clipmask(c);
 
    /* -ve rhw workaround */
-   if (BRW_IS_965(p->brw)) {
+   if (brw->has_negative_rhw_bug) {
       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));
@@ -190,7 +191,7 @@ static void clip_and_emit_line( struct brw_clip_compile *c )
               * Both can be negative on GM965/G965 due to RHW workaround
               * if so, this object should be rejected.
               */
-             if (BRW_IS_965(p->brw)) {
+             if (brw->has_negative_rhw_bug) {
                  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);
                  {
@@ -215,7 +216,7 @@ static void clip_and_emit_line( struct brw_clip_compile *c )
 
              /* If both are positive, do nothing */
              /* Only on GM965/G965 */
-             if (BRW_IS_965(p->brw)) {
+             if (brw->has_negative_rhw_bug) {
                  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);
              }
@@ -230,7 +231,7 @@ static void clip_and_emit_line( struct brw_clip_compile *c )
                  brw_set_predicate_control(p, BRW_PREDICATE_NONE);
              }
 
-             if (BRW_IS_965(p->brw)) {
+             if (brw->has_negative_rhw_bug) {
                  brw_ENDIF(p, is_neg2);
              }
          }

src/mesa/drivers/dri/i965/brw_clip_tri.c

@@ -572,6 +572,7 @@ void brw_emit_tri_clip( struct brw_clip_compile *c )
 {
    struct brw_instruction *neg_rhw;
    struct brw_compile *p = &c->func;
+   struct brw_context *brw = p->brw;
    brw_clip_tri_alloc_regs(c, 3 + c->key.nr_userclip + 6);
    brw_clip_tri_init_vertices(c);
    brw_clip_init_clipmask(c);
@@ -579,7 +580,7 @@ void brw_emit_tri_clip( struct brw_clip_compile *c )
 
    /* if -ve rhw workaround bit is set, 
       do cliptest */
-   if (BRW_IS_965(p->brw)) {
+   if (brw->has_negative_rhw_bug) {
       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));

src/mesa/drivers/dri/i965/brw_context.c

@@ -163,11 +163,10 @@ GLboolean brwCreateContext( const __GLcontextModes *mesaVis,
       brw->CMD_PIPELINE_SELECT = CMD_PIPELINE_SELECT_GM45;
       brw->has_surface_tile_offset = GL_TRUE;
       brw->has_compr4 = GL_TRUE;
+      brw->has_aa_line_parameters = GL_TRUE;
   } else {
       brw->CMD_VF_STATISTICS = CMD_VF_STATISTICS_965;
       brw->CMD_PIPELINE_SELECT = CMD_PIPELINE_SELECT_965;
-      brw->has_surface_tile_offset = GL_FALSE;
-      brw->has_compr4 = GL_FALSE;
    }
 
    /* WM maximum threads is number of EUs times number of threads per EU. */
@@ -183,6 +182,7 @@ GLboolean brwCreateContext( const __GLcontextModes *mesaVis,
       brw->urb.size = 256;
       brw->vs_max_threads = 16;
       brw->wm_max_threads = 8 * 4;
+      brw->has_negative_rhw_bug = GL_TRUE;
    }
 
    if (INTEL_DEBUG & DEBUG_SINGLE_THREAD) {

src/mesa/drivers/dri/i965/brw_context.h

@@ -440,6 +440,8 @@ struct brw_context
    GLboolean emit_state_always;
    GLboolean has_surface_tile_offset;
    GLboolean has_compr4;
+   GLboolean has_negative_rhw_bug;
+   GLboolean has_aa_line_parameters;
 ;
    struct {
       struct brw_state_flags dirty;

src/mesa/drivers/dri/i965/brw_defines.h

@@ -832,7 +832,4 @@
 
 #include "intel_chipset.h"
 
-#define BRW_IS_965(brw)         (!(brw)->intel.is_g4x && \
-				 !(brw)->intel.is_ironlake)
-
 #endif

src/mesa/drivers/dri/i965/brw_misc_state.c

@@ -374,8 +374,8 @@ const struct brw_tracked_state brw_polygon_stipple_offset = {
 static void upload_aa_line_parameters(struct brw_context *brw)
 {
    struct brw_aa_line_parameters balp;
-   
-   if (BRW_IS_965(brw))
+
+   if (!brw->has_aa_line_parameters)
       return;
 
    /* use legacy aa line coverage computation */

src/mesa/drivers/dri/i965/brw_vs_emit.c

@@ -1114,7 +1114,8 @@ static void emit_swz( struct brw_vs_compile *c,
 static void emit_vertex_write( struct brw_vs_compile *c)
 {
    struct brw_compile *p = &c->func;
-   struct intel_context *intel = &p->brw->intel;
+   struct brw_context *brw = p->brw;
+   struct intel_context *intel = &brw->intel;
    struct brw_reg m0 = brw_message_reg(0);
    struct brw_reg pos = c->regs[PROGRAM_OUTPUT][VERT_RESULT_HPOS];
    struct brw_reg ndc;
@@ -1138,7 +1139,7 @@ static void emit_vertex_write( struct brw_vs_compile *c)
     * workaround.
     */
    if ((c->prog_data.outputs_written & BITFIELD64_BIT(VERT_RESULT_PSIZ)) ||
-       c->key.nr_userclip || BRW_IS_965(p->brw))
+       c->key.nr_userclip || brw->has_negative_rhw_bug)
    {
       struct brw_reg header1 = retype(get_tmp(c), BRW_REGISTER_TYPE_UD);
       GLuint i;
@@ -1169,7 +1170,7 @@ static void emit_vertex_write( struct brw_vs_compile *c)
        * Later, clipping will detect ucp[6] and ensure the primitive is
        * clipped against all fixed planes.
        */
-      if (BRW_IS_965(p->brw)) {
+      if (brw->has_negative_rhw_bug) {
 	 brw_CMP(p,
 		 vec8(brw_null_reg()),
 		 BRW_CONDITIONAL_L,

src/mesa/drivers/dri/intel/intel_extensions.c

@@ -196,7 +196,7 @@ intelInitExtensions(GLcontext *ctx)
     */
    driInitExtensions(ctx, card_extensions, GL_FALSE);
 
-   if (IS_965(intel->intelScreen->deviceID))
+   if (intel->gen >= 4)
       driInitExtensions(ctx, brw_extensions, GL_FALSE);
 
    if (IS_915(intel->intelScreen->deviceID)