i965: Move clip program compilation to the compiler

Reviewed-by: Topi Pohjolainen <topi.pohjolainen@intel.com>

src/intel/compiler/brw_compiler.h

@@ -281,6 +281,47 @@ struct brw_sf_prog_key {
    bool userclip_active:1;
 };
 
+enum brw_clip_mode {
+   BRW_CLIP_MODE_NORMAL             = 0,
+   BRW_CLIP_MODE_CLIP_ALL           = 1,
+   BRW_CLIP_MODE_CLIP_NON_REJECTED  = 2,
+   BRW_CLIP_MODE_REJECT_ALL         = 3,
+   BRW_CLIP_MODE_ACCEPT_ALL         = 4,
+   BRW_CLIP_MODE_KERNEL_CLIP        = 5,
+};
+
+enum brw_clip_fill_mode {
+   BRW_CLIP_FILL_MODE_LINE = 0,
+   BRW_CLIP_FILL_MODE_POINT = 1,
+   BRW_CLIP_FILL_MODE_FILL = 2,
+   BRW_CLIP_FILL_MODE_CULL = 3,
+};
+
+/* Note that if unfilled primitives are being emitted, we have to fix
+ * up polygon offset and flatshading at this point:
+ */
+struct brw_clip_prog_key {
+   uint64_t attrs;
+   bool contains_flat_varying;
+   bool contains_noperspective_varying;
+   unsigned char interp_mode[65]; /* BRW_VARYING_SLOT_COUNT */
+   unsigned primitive:4;
+   unsigned nr_userclip:4;
+   bool pv_first:1;
+   bool do_unfilled:1;
+   enum brw_clip_fill_mode fill_cw:2;  /* includes cull information */
+   enum brw_clip_fill_mode fill_ccw:2; /* includes cull information */
+   bool offset_cw:1;
+   bool offset_ccw:1;
+   bool copy_bfc_cw:1;
+   bool copy_bfc_ccw:1;
+   enum brw_clip_mode clip_mode:3;
+
+   float offset_factor;
+   float offset_units;
+   float offset_clamp;
+};
+
 /* A big lookup table is used to figure out which and how many
  * additional regs will inserted before the main payload in the WM
  * program execution.  These mainly relate to depth and stencil
@@ -905,6 +946,13 @@ struct brw_sf_prog_data {
    unsigned urb_entry_size;
 };
 
+struct brw_clip_prog_data {
+   uint32_t curb_read_length;	/* user planes? */
+   uint32_t clip_mode;
+   uint32_t urb_read_length;
+   uint32_t total_grf;
+};
+
 #define DEFINE_PROG_DATA_DOWNCAST(stage)                       \
 static inline struct brw_##stage##_prog_data *                 \
 brw_##stage##_prog_data(struct brw_stage_prog_data *prog_data) \
@@ -1010,6 +1058,22 @@ brw_compile_sf(const struct brw_compiler *compiler,
                struct brw_vue_map *vue_map,
                unsigned *final_assembly_size);
 
+/**
+ * Compile a clipper shader.
+ *
+ * This is a fixed-function shader determined entirely by the shader key and
+ * a VUE map.
+ *
+ * Returns the final assembly and the program's size.
+ */
+const unsigned *
+brw_compile_clip(const struct brw_compiler *compiler,
+                 void *mem_ctx,
+                 const struct brw_clip_prog_key *key,
+                 struct brw_clip_prog_data *prog_data,
+                 struct brw_vue_map *vue_map,
+                 unsigned *final_assembly_size);
+
 /**
  * Compile a fragment shader.
  *