gallium: Add PIPE_SHADER_CAP_FP16

Denotes native half precision float operations capability
v2: PIPE_CAP_HALFS -> PIPE_SHADER_CAP_FP16
    fix indentation

Signed-off-by: Jan Vesely <jan.vesely@rutgers.edu>
Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com>

16 files changed, 27 insertions, 0 deletions

diff --git a/src/gallium/auxiliary/gallivm/lp_bld_limits.h b/src/gallium/auxiliary/gallivm/lp_bld_limits.h
index 354e2a46b13..e8cc04a2f98 100644
--- a/src/gallium/auxiliary/gallivm/lp_bld_limits.h
+++ b/src/gallium/auxiliary/gallivm/lp_bld_limits.h
@@ -118,6 +118,8 @@ gallivm_get_shader_param(enum pipe_shader_cap param)
       return 1;
    case PIPE_SHADER_CAP_INTEGERS:
       return 1;
+   case PIPE_SHADER_CAP_FP16:
+      return 0;
    case PIPE_SHADER_CAP_MAX_TEXTURE_SAMPLERS:
       return PIPE_MAX_SAMPLERS;
    case PIPE_SHADER_CAP_MAX_SAMPLER_VIEWS:
diff --git a/src/gallium/auxiliary/tgsi/tgsi_exec.h b/src/gallium/auxiliary/tgsi/tgsi_exec.h
index 9d7e65f2c51..346848cddf2 100644
--- a/src/gallium/auxiliary/tgsi/tgsi_exec.h
+++ b/src/gallium/auxiliary/tgsi/tgsi_exec.h
@@ -511,6 +511,8 @@ tgsi_exec_get_shader_param(enum pipe_shader_cap param)
       return 1;
    case PIPE_SHADER_CAP_INTEGERS:
       return 1;
+   case PIPE_SHADER_CAP_FP16:
+      return 0;
    case PIPE_SHADER_CAP_MAX_TEXTURE_SAMPLERS:
       return PIPE_MAX_SAMPLERS;
    case PIPE_SHADER_CAP_MAX_SAMPLER_VIEWS:
diff --git a/src/gallium/docs/source/screen.rst b/src/gallium/docs/source/screen.rst
index bf5b65a2d4c..dfbb6cda6cd 100644
--- a/src/gallium/docs/source/screen.rst
+++ b/src/gallium/docs/source/screen.rst
@@ -472,6 +472,8 @@ MOV OUT[0], CONST[0][3]  # copy vector 3 of constbuf 0
   BGNSUB, ENDSUB, CAL, and RET, including RET in the main block.
 * ``PIPE_SHADER_CAP_INTEGERS``: Whether integer opcodes are supported.
   If unsupported, only float opcodes are supported.
+* ``PIPE_SHADER_CAP_FP16``: Whether half precision floating-point opcodes are supported.
+   If unsupported, half precision ops need to be lowered to full precision.
 * ``PIPE_SHADER_CAP_MAX_TEXTURE_SAMPLERS``: The maximum number of texture
   samplers.
 * ``PIPE_SHADER_CAP_PREFERRED_IR``: Preferred representation of the
diff --git a/src/gallium/drivers/etnaviv/etnaviv_screen.c b/src/gallium/drivers/etnaviv/etnaviv_screen.c
index 49c700a3d0f..953ca1204a4 100644
--- a/src/gallium/drivers/etnaviv/etnaviv_screen.c
+++ b/src/gallium/drivers/etnaviv/etnaviv_screen.c
@@ -428,6 +428,7 @@ etna_screen_get_shader_param(struct pipe_screen *pscreen,
    case PIPE_SHADER_CAP_TGSI_SQRT_SUPPORTED:
       return VIV_FEATURE(screen, chipMinorFeatures0, HAS_SQRT_TRIG);
    case PIPE_SHADER_CAP_INTEGERS:
+   case PIPE_SHADER_CAP_FP16:
       return 0;
    case PIPE_SHADER_CAP_MAX_TEXTURE_SAMPLERS:
    case PIPE_SHADER_CAP_MAX_SAMPLER_VIEWS:
diff --git a/src/gallium/drivers/freedreno/freedreno_screen.c b/src/gallium/drivers/freedreno/freedreno_screen.c
index 425d967015a..a91e3c2e709 100644
--- a/src/gallium/drivers/freedreno/freedreno_screen.c
+++ b/src/gallium/drivers/freedreno/freedreno_screen.c
@@ -527,6 +527,8 @@ fd_screen_get_shader_param(struct pipe_screen *pscreen,
 		if (glsl120)
 			return 0;
 		return is_ir3(screen) ? 1 : 0;
+	case PIPE_SHADER_CAP_FP16:
+		return 0;
 	case PIPE_SHADER_CAP_MAX_TEXTURE_SAMPLERS:
 	case PIPE_SHADER_CAP_MAX_SAMPLER_VIEWS:
 		return 16;
diff --git a/src/gallium/drivers/i915/i915_screen.c b/src/gallium/drivers/i915/i915_screen.c
index 749dc9cb53e..95ed3341b3d 100644
--- a/src/gallium/drivers/i915/i915_screen.c
+++ b/src/gallium/drivers/i915/i915_screen.c
@@ -157,6 +157,7 @@ i915_get_shader_param(struct pipe_screen *screen,
       case PIPE_SHADER_CAP_SUBROUTINES:
          return 0;
       case PIPE_SHADER_CAP_INTEGERS:
+      case PIPE_SHADER_CAP_FP16:
          return 0;
       case PIPE_SHADER_CAP_MAX_TEXTURE_SAMPLERS:
       case PIPE_SHADER_CAP_MAX_SAMPLER_VIEWS:
diff --git a/src/gallium/drivers/nouveau/nv30/nv30_screen.c b/src/gallium/drivers/nouveau/nv30/nv30_screen.c
index dc272ecafa6..ba466050c6f 100644
--- a/src/gallium/drivers/nouveau/nv30/nv30_screen.c
+++ b/src/gallium/drivers/nouveau/nv30/nv30_screen.c
@@ -314,6 +314,7 @@ nv30_screen_get_shader_param(struct pipe_screen *pscreen,
       case PIPE_SHADER_CAP_INDIRECT_CONST_ADDR:
       case PIPE_SHADER_CAP_SUBROUTINES:
       case PIPE_SHADER_CAP_INTEGERS:
+      case PIPE_SHADER_CAP_FP16:
       case PIPE_SHADER_CAP_TGSI_DROUND_SUPPORTED:
       case PIPE_SHADER_CAP_TGSI_DFRACEXP_DLDEXP_SUPPORTED:
       case PIPE_SHADER_CAP_TGSI_FMA_SUPPORTED:
@@ -362,6 +363,7 @@ nv30_screen_get_shader_param(struct pipe_screen *pscreen,
       case PIPE_SHADER_CAP_INDIRECT_CONST_ADDR:
       case PIPE_SHADER_CAP_SUBROUTINES:
       case PIPE_SHADER_CAP_INTEGERS:
+      case PIPE_SHADER_CAP_FP16:
       case PIPE_SHADER_CAP_TGSI_DROUND_SUPPORTED:
       case PIPE_SHADER_CAP_TGSI_DFRACEXP_DLDEXP_SUPPORTED:
       case PIPE_SHADER_CAP_TGSI_FMA_SUPPORTED:
diff --git a/src/gallium/drivers/nouveau/nv50/nv50_screen.c b/src/gallium/drivers/nouveau/nv50/nv50_screen.c
index fd100c60e8e..60b60373960 100644
--- a/src/gallium/drivers/nouveau/nv50/nv50_screen.c
+++ b/src/gallium/drivers/nouveau/nv50/nv50_screen.c
@@ -345,6 +345,7 @@ nv50_screen_get_shader_param(struct pipe_screen *pscreen,
       return 1;
    case PIPE_SHADER_CAP_TGSI_SQRT_SUPPORTED:
       return 1;
+   case PIPE_SHADER_CAP_FP16:
    case PIPE_SHADER_CAP_SUBROUTINES:
       return 0; /* please inline, or provide function declarations */
    case PIPE_SHADER_CAP_INTEGERS:
diff --git a/src/gallium/drivers/nouveau/nvc0/nvc0_screen.c b/src/gallium/drivers/nouveau/nvc0/nvc0_screen.c
index 219e0652a5f..8cf6ba65065 100644
--- a/src/gallium/drivers/nouveau/nvc0/nvc0_screen.c
+++ b/src/gallium/drivers/nouveau/nvc0/nvc0_screen.c
@@ -405,6 +405,7 @@ nvc0_screen_get_shader_param(struct pipe_screen *pscreen,
    case PIPE_SHADER_CAP_TGSI_DFRACEXP_DLDEXP_SUPPORTED:
    case PIPE_SHADER_CAP_TGSI_ANY_INOUT_DECL_RANGE:
    case PIPE_SHADER_CAP_LOWER_IF_THRESHOLD:
+   case PIPE_SHADER_CAP_FP16:
       return 0;
    case PIPE_SHADER_CAP_MAX_SHADER_BUFFERS:
       return NVC0_MAX_BUFFERS;
diff --git a/src/gallium/drivers/r300/r300_screen.c b/src/gallium/drivers/r300/r300_screen.c
index 3a449f0e919..2838b7cf00d 100644
--- a/src/gallium/drivers/r300/r300_screen.c
+++ b/src/gallium/drivers/r300/r300_screen.c
@@ -354,6 +354,7 @@ static int r300_get_shader_param(struct pipe_screen *pscreen,
         case PIPE_SHADER_CAP_INDIRECT_CONST_ADDR:
         case PIPE_SHADER_CAP_SUBROUTINES:
         case PIPE_SHADER_CAP_INTEGERS:
+        case PIPE_SHADER_CAP_FP16:
         case PIPE_SHADER_CAP_TGSI_DROUND_SUPPORTED:
         case PIPE_SHADER_CAP_TGSI_DFRACEXP_DLDEXP_SUPPORTED:
         case PIPE_SHADER_CAP_TGSI_FMA_SUPPORTED:
@@ -413,6 +414,7 @@ static int r300_get_shader_param(struct pipe_screen *pscreen,
         case PIPE_SHADER_CAP_INDIRECT_TEMP_ADDR:
         case PIPE_SHADER_CAP_SUBROUTINES:
         case PIPE_SHADER_CAP_INTEGERS:
+        case PIPE_SHADER_CAP_FP16:
         case PIPE_SHADER_CAP_MAX_TEXTURE_SAMPLERS:
         case PIPE_SHADER_CAP_MAX_SAMPLER_VIEWS:
         case PIPE_SHADER_CAP_TGSI_DROUND_SUPPORTED:
diff --git a/src/gallium/drivers/r600/r600_pipe.c b/src/gallium/drivers/r600/r600_pipe.c
index 2d1ed765e35..2e5008c8d4d 100644
--- a/src/gallium/drivers/r600/r600_pipe.c
+++ b/src/gallium/drivers/r600/r600_pipe.c
@@ -570,6 +570,7 @@ static int r600_get_shader_param(struct pipe_screen* pscreen,
 	case PIPE_SHADER_CAP_INDIRECT_CONST_ADDR:
 		return 1;
 	case PIPE_SHADER_CAP_SUBROUTINES:
+	case PIPE_SHADER_CAP_FP16:
 		return 0;
 	case PIPE_SHADER_CAP_INTEGERS:
 	case PIPE_SHADER_CAP_TGSI_ANY_INOUT_DECL_RANGE:
diff --git a/src/gallium/drivers/radeonsi/si_pipe.c b/src/gallium/drivers/radeonsi/si_pipe.c
index 372bc56ce76..0666798964b 100644
--- a/src/gallium/drivers/radeonsi/si_pipe.c
+++ b/src/gallium/drivers/radeonsi/si_pipe.c
@@ -742,6 +742,7 @@ static int si_get_shader_param(struct pipe_screen* pscreen,
 	case PIPE_SHADER_CAP_INDIRECT_TEMP_ADDR:
 	case PIPE_SHADER_CAP_INDIRECT_CONST_ADDR:
 	case PIPE_SHADER_CAP_INTEGERS:
+	case PIPE_SHADER_CAP_FP16:
 	case PIPE_SHADER_CAP_TGSI_FMA_SUPPORTED:
 	case PIPE_SHADER_CAP_TGSI_ANY_INOUT_DECL_RANGE:
 	case PIPE_SHADER_CAP_TGSI_SKIP_MERGE_REGISTERS:
diff --git a/src/gallium/drivers/svga/svga_screen.c b/src/gallium/drivers/svga/svga_screen.c
index bc533cd7ae8..3845d176925 100644
--- a/src/gallium/drivers/svga/svga_screen.c
+++ b/src/gallium/drivers/svga/svga_screen.c
@@ -519,6 +519,8 @@ vgpu9_get_shader_param(struct pipe_screen *screen,
          return 0;
       case PIPE_SHADER_CAP_INTEGERS:
          return 0;
+      case PIPE_SHADER_CAP_FP16:
+         return 0;
       case PIPE_SHADER_CAP_MAX_TEXTURE_SAMPLERS:
       case PIPE_SHADER_CAP_MAX_SAMPLER_VIEWS:
          return 16;
@@ -580,6 +582,8 @@ vgpu9_get_shader_param(struct pipe_screen *screen,
          return 0;
       case PIPE_SHADER_CAP_INTEGERS:
          return 0;
+      case PIPE_SHADER_CAP_FP16:
+         return 0;
       case PIPE_SHADER_CAP_MAX_TEXTURE_SAMPLERS:
       case PIPE_SHADER_CAP_MAX_SAMPLER_VIEWS:
          return 0;
@@ -675,6 +679,8 @@ vgpu10_get_shader_param(struct pipe_screen *screen,
    case PIPE_SHADER_CAP_SUBROUTINES:
    case PIPE_SHADER_CAP_INTEGERS:
       return TRUE;
+   case PIPE_SHADER_CAP_FP16:
+      return FALSE;
    case PIPE_SHADER_CAP_MAX_TEXTURE_SAMPLERS:
    case PIPE_SHADER_CAP_MAX_SAMPLER_VIEWS:
       return SVGA3D_DX_MAX_SAMPLERS;
diff --git a/src/gallium/drivers/vc4/vc4_screen.c b/src/gallium/drivers/vc4/vc4_screen.c
index baf2456b191..04ae44688d4 100644
--- a/src/gallium/drivers/vc4/vc4_screen.c
+++ b/src/gallium/drivers/vc4/vc4_screen.c
@@ -407,6 +407,7 @@ vc4_screen_get_shader_param(struct pipe_screen *pscreen,
                 return 0;
         case PIPE_SHADER_CAP_INTEGERS:
                 return 1;
+        case PIPE_SHADER_CAP_FP16:
         case PIPE_SHADER_CAP_TGSI_DROUND_SUPPORTED:
         case PIPE_SHADER_CAP_TGSI_DFRACEXP_DLDEXP_SUPPORTED:
         case PIPE_SHADER_CAP_TGSI_FMA_SUPPORTED:
diff --git a/src/gallium/drivers/virgl/virgl_screen.c b/src/gallium/drivers/virgl/virgl_screen.c
index 3c1843e3042..46b3bd3fd09 100644
--- a/src/gallium/drivers/virgl/virgl_screen.c
+++ b/src/gallium/drivers/virgl/virgl_screen.c
@@ -335,6 +335,7 @@ virgl_get_shader_param(struct pipe_screen *screen,
          return 4096 * sizeof(float[4]);
       case PIPE_SHADER_CAP_LOWER_IF_THRESHOLD:
       case PIPE_SHADER_CAP_TGSI_SKIP_MERGE_REGISTERS:
+      case PIPE_SHADER_CAP_FP16:
       default:
          return 0;
       }
diff --git a/src/gallium/include/pipe/p_defines.h b/src/gallium/include/pipe/p_defines.h
index cadafe7f8c8..72944920171 100644
--- a/src/gallium/include/pipe/p_defines.h
+++ b/src/gallium/include/pipe/p_defines.h
@@ -832,6 +832,7 @@ enum pipe_shader_cap
    PIPE_SHADER_CAP_INDIRECT_CONST_ADDR,
    PIPE_SHADER_CAP_SUBROUTINES, /* BGNSUB, ENDSUB, CAL, RET */
    PIPE_SHADER_CAP_INTEGERS,
+   PIPE_SHADER_CAP_FP16,
    PIPE_SHADER_CAP_MAX_TEXTURE_SAMPLERS,
    PIPE_SHADER_CAP_PREFERRED_IR,
    PIPE_SHADER_CAP_TGSI_SQRT_SUPPORTED,