i965/vs/gen7: Emit code for GLSL ES 3.00 pack/unpack operations (v3)

FIXME: This patch emits VS code that violates documented hardware
restrictions and then relies on undocumented behavior that results from
that violation.  This patch passes all tests, but should be fixed ASAP to
conform to the hardware documentation.

v2: Explain undocumented hardware behavior. Improve comments.
v3: Use ALU1 helper methods F32TO16() and F16TO32(). [for anholt]

Reviewed-by: Eric Anholt <[email protected]>
Reviewed-by: Ian Romanick <[email protected]> (v1)
Signed-off-by: Chad Versace <[email protected]>

1 files changed, 5 insertions, 0 deletions

diff --git a/src/mesa/drivers/dri/i965/brw_vec4.h b/src/mesa/drivers/dri/i965/brw_vec4.h
index e65b92caa7b..86921a033d1 100644
--- a/src/mesa/drivers/dri/i965/brw_vec4.h
+++ b/src/mesa/drivers/dri/i965/brw_vec4.h
@@ -358,6 +358,8 @@ public:
    vec4_instruction *RNDE(dst_reg dst, src_reg src0);
    vec4_instruction *RNDZ(dst_reg dst, src_reg src0);
    vec4_instruction *FRC(dst_reg dst, src_reg src0);
+   vec4_instruction *F32TO16(dst_reg dst, src_reg src0);
+   vec4_instruction *F16TO32(dst_reg dst, src_reg src0);
    vec4_instruction *ADD(dst_reg dst, src_reg src0, src_reg src1);
    vec4_instruction *MUL(dst_reg dst, src_reg src0, src_reg src1);
    vec4_instruction *MACH(dst_reg dst, src_reg src0, src_reg src1);
@@ -431,6 +433,9 @@ public:
    void emit_math(enum opcode opcode, dst_reg dst, src_reg src0, src_reg src1);
    src_reg fix_math_operand(src_reg src);
 
+   void emit_pack_half_2x16(dst_reg dst, src_reg src0);
+   void emit_unpack_half_2x16(dst_reg dst, src_reg src0);
+
    void swizzle_result(ir_texture *ir, src_reg orig_val, int sampler);
 
    void emit_ndc_computation();