intel: Replace some gen3 IS_* checks with context structure usage.

Shaves 400 bytes or so from i915_dri.so.

src/mesa/drivers/dri/i915/i915_vtbl.c

@@ -611,7 +611,7 @@ i915_state_draw_region(struct intel_context *intel,
     * the value of this bit, the pipeline needs to be MI_FLUSHed.  And it
     * can only be set when a depth buffer is already defined.
     */
-   if (IS_945(intel->intelScreen->deviceID) && intel->use_early_z &&
+   if (intel->is_945 && intel->use_early_z &&
        depth_region->tiling != I915_TILING_NONE)
       value |= CLASSIC_EARLY_DEPTH;
 

src/mesa/drivers/dri/i915/intel_tris.c

@@ -221,7 +221,7 @@ void intel_flush_prim(struct intel_context *intel)
    intel->prim.count = 0;
    offset = intel->prim.start_offset;
    intel->prim.start_offset = intel->prim.current_offset;
-   if (!IS_9XX(intel->intelScreen->deviceID))
+   if (!intel->gen >= 3)
       intel->prim.start_offset = ALIGN(intel->prim.start_offset, 128);
    intel->prim.flush = NULL;
 
@@ -251,7 +251,7 @@ void intel_flush_prim(struct intel_context *intel)
 	  intel->vertex_size * 4);
 #endif
 
-   if (IS_9XX(intel->intelScreen->deviceID)) {
+   if (intel->gen >= 3) {
       BEGIN_BATCH(5, LOOP_CLIPRECTS);
       OUT_BATCH(_3DSTATE_LOAD_STATE_IMMEDIATE_1 |
 		I1_LOAD_S(0) | I1_LOAD_S(1) | 1);

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

@@ -613,12 +613,16 @@ intelInitContext(struct intel_context *intel,
    intel->sarea = intelScreen->sarea;
    intel->driContext = driContextPriv;
 
-   if (IS_965(intel->intelScreen->deviceID))
+   if (IS_965(intel->intelScreen->deviceID)) {
       intel->gen = 4;
-   else if (IS_9XX(intel->intelScreen->deviceID))
+   } else if (IS_9XX(intel->intelScreen->deviceID)) {
       intel->gen = 3;
-   else
+      if (IS_945(intel->intelScreen->deviceID)) {
+	 intel->is_945 = GL_TRUE;
+      }
+   } else {
       intel->gen = 2;
+   }
 
    if (IS_IGDNG(intel->intelScreen->deviceID)) {
       intel->is_ironlake = GL_TRUE;

src/mesa/drivers/dri/intel/intel_context.h

@@ -179,6 +179,7 @@ struct intel_context
    GLboolean needs_ff_sync;
    GLboolean is_ironlake;
    GLboolean is_g4x;
+   GLboolean is_945;
    GLboolean has_luminance_srgb;
 
    int urb_size;

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

@@ -199,8 +199,7 @@ intelInitExtensions(GLcontext *ctx)
    if (intel->gen >= 4)
       driInitExtensions(ctx, brw_extensions, GL_FALSE);
 
-   if (IS_915(intel->intelScreen->deviceID)
-       || IS_945(intel->intelScreen->deviceID)) {
+   if (intel->gen == 3) {
       driInitExtensions(ctx, i915_extensions, GL_FALSE);
 
       if (driQueryOptionb(&intel->optionCache, "fragment_shader"))

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

@@ -87,7 +87,7 @@ intel_miptree_create_internal(struct intel_context *intel,
    mt->pitch = 0;
 
 #ifdef I915
-   if (IS_945(intel->intelScreen->deviceID))
+   if (intel->is_945)
       ok = i945_miptree_layout(intel, mt, tiling);
    else
       ok = i915_miptree_layout(intel, mt, tiling);