i965: Add scalar geometry shader support.

This is hidden behind INTEL_SCALAR_GS=1 for now, as we don't yet support
instanced geometry shaders, and Orbital Explorer's shader spills like
crazy.  But the infrastructure is in place, and it's largely working.

v2: Lots of rebasing.

v3: (feedback from Kristian Høgsberg)
- Handle stride and subreg_offset correctly for ATTRs; use a helper.
- Fix missing emit_shader_time_end() call.
- Delete dead code after early EOT in static vertex case to avoid
  tripping asserts in emit_shader_time_end().
- Use proper D/UD type in intexp2().
- Fix "EndPrimitve" and "to that" typos.
- Assert that invocations == 1 so we know this is missing.

Signed-off-by: Kenneth Graunke <[email protected]>
Reviewed-by: Kristian Høgsberg <[email protected]>

1 files changed, 16 insertions, 1 deletions

diff --git a/src/mesa/drivers/dri/i965/brw_fs.h b/src/mesa/drivers/dri/i965/brw_fs.h
index caf56555981..2dfcab1c51a 100644
--- a/src/mesa/drivers/dri/i965/brw_fs.h
+++ b/src/mesa/drivers/dri/i965/brw_fs.h
@@ -132,18 +132,22 @@ public:
 
    bool run_fs(bool do_rep_send);
    bool run_vs(gl_clip_plane *clip_planes);
+   bool run_gs();
    bool run_cs();
    void optimize();
    void allocate_registers();
    void setup_payload_gen4();
    void setup_payload_gen6();
    void setup_vs_payload();
+   void setup_gs_payload();
    void setup_cs_payload();
    void fixup_3src_null_dest();
    void assign_curb_setup();
    void calculate_urb_setup();
    void assign_urb_setup();
+   void convert_attr_sources_to_hw_regs(fs_inst *inst);
    void assign_vs_urb_setup();
+   void assign_gs_urb_setup();
    bool assign_regs(bool allow_spilling);
    void assign_regs_trivial();
    void calculate_payload_ranges(int payload_node_count,
@@ -281,7 +285,16 @@ public:
                                  fs_reg color1, fs_reg color2,
                                  fs_reg src0_alpha, unsigned components);
    void emit_fb_writes();
-   void emit_urb_writes();
+   void emit_urb_writes(const fs_reg &gs_vertex_count = fs_reg());
+   void set_gs_stream_control_data_bits(const fs_reg &vertex_count,
+                                        unsigned stream_id);
+   void emit_gs_control_data_bits(const fs_reg &vertex_count);
+   void emit_gs_end_primitive(const nir_src &vertex_count_nir_src);
+   void emit_gs_vertex(const nir_src &vertex_count_nir_src,
+                       unsigned stream_id);
+   void emit_gs_thread_end();
+   void emit_gs_input_load(const fs_reg &dst, const nir_src &vertex_src,
+                           unsigned offset, unsigned num_components);
    void emit_cs_terminate();
    fs_reg *emit_cs_local_invocation_id_setup();
    fs_reg *emit_cs_work_group_id_setup();
@@ -389,6 +402,8 @@ public:
    fs_reg delta_xy[BRW_WM_BARYCENTRIC_INTERP_MODE_COUNT];
    fs_reg shader_start_time;
    fs_reg userplane[MAX_CLIP_PLANES];
+   fs_reg final_gs_vertex_count;
+   fs_reg control_data_bits;
 
    unsigned grf_used;
    bool spilled_any_registers;