gallium: Add pipe cap for primitive restart with fixed index

Adds PIPE_CAP_PRIMITIVE_RESTART_FIXED_INDEX which is a subset of the
primitive restart cap for when the hardware can only support the fixed
indices specified in GLES.

The switch statements were automatically modified with this command:

find \( \( -name \*.cpp -o -name \*.c \) \! -type l \) \
 -exec sed -i -r \
 's/^(\s*case\s+PIPE_CAP_PRIMITIVE_RESTART)\s*:.*$/\0\n\1_FIXED_INDEX:/' \
 {} \;

v2: Add a note in screen.rst

Reviewed-by: Eric Anholt <[email protected]> (v1)
Reviewed by: Erik Faye-Lund <[email protected]>

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5559>

20 files changed, 25 insertions, 0 deletions

diff --git a/src/gallium/auxiliary/util/u_screen.c b/src/gallium/auxiliary/util/u_screen.c
index 6b0a106a637..69e44ab0dce 100644
--- a/src/gallium/auxiliary/util/u_screen.c
+++ b/src/gallium/auxiliary/util/u_screen.c
@@ -64,6 +64,7 @@ u_pipe_screen_get_param_defaults(struct pipe_screen *pscreen,
    case PIPE_CAP_VERTEX_SHADER_SATURATE:
    case PIPE_CAP_MAX_STREAM_OUTPUT_BUFFERS: /* enables EXT_transform_feedback */
    case PIPE_CAP_PRIMITIVE_RESTART:
+   case PIPE_CAP_PRIMITIVE_RESTART_FIXED_INDEX:
    case PIPE_CAP_INDEP_BLEND_ENABLE:
    case PIPE_CAP_INDEP_BLEND_FUNC:
    case PIPE_CAP_MAX_TEXTURE_ARRAY_LAYERS: /* Enables GL_EXT_texture_array */
diff --git a/src/gallium/docs/source/screen.rst b/src/gallium/docs/source/screen.rst
index e98bc1cde01..25b153265ec 100644
--- a/src/gallium/docs/source/screen.rst
+++ b/src/gallium/docs/source/screen.rst
@@ -52,6 +52,9 @@ The integer capabilities:
   from color blend equations, in :ref:`Blend` state.
 * ``PIPE_CAP_MAX_STREAM_OUTPUT_BUFFERS``: The maximum number of stream buffers.
 * ``PIPE_CAP_PRIMITIVE_RESTART``: Whether primitive restart is supported.
+* ``PIPE_CAP_PRIMITIVE_RESTART_FIXED_INDEX``: Subset of
+  PRIMITIVE_RESTART where the restart index is always the fixed maximum
+  value for the index type.
 * ``PIPE_CAP_INDEP_BLEND_ENABLE``: Whether per-rendertarget blend enabling and channel
   masks are supported. If 0, then the first rendertarget's blend mask is
   replicated across all MRTs.
diff --git a/src/gallium/drivers/etnaviv/etnaviv_screen.c b/src/gallium/drivers/etnaviv/etnaviv_screen.c
index 64a6fa2abaf..4dccdb4ccab 100644
--- a/src/gallium/drivers/etnaviv/etnaviv_screen.c
+++ b/src/gallium/drivers/etnaviv/etnaviv_screen.c
@@ -174,6 +174,7 @@ etna_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
    case PIPE_CAP_ANISOTROPIC_FILTER:
    case PIPE_CAP_TEXTURE_SWIZZLE:
    case PIPE_CAP_PRIMITIVE_RESTART:
+   case PIPE_CAP_PRIMITIVE_RESTART_FIXED_INDEX:
       return VIV_FEATURE(screen, chipMinorFeatures1, HALTI0);
 
    /* Unsupported features. */
diff --git a/src/gallium/drivers/freedreno/freedreno_screen.c b/src/gallium/drivers/freedreno/freedreno_screen.c
index 27ad3697798..d6236f52548 100644
--- a/src/gallium/drivers/freedreno/freedreno_screen.c
+++ b/src/gallium/drivers/freedreno/freedreno_screen.c
@@ -232,6 +232,7 @@ fd_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
 	case PIPE_CAP_FRAGMENT_SHADER_DERIVATIVES:
 	case PIPE_CAP_VERTEX_SHADER_SATURATE:
 	case PIPE_CAP_PRIMITIVE_RESTART:
+	case PIPE_CAP_PRIMITIVE_RESTART_FIXED_INDEX:
 	case PIPE_CAP_TGSI_INSTANCEID:
 	case PIPE_CAP_VERTEX_ELEMENT_INSTANCE_DIVISOR:
 	case PIPE_CAP_INDEP_BLEND_ENABLE:
diff --git a/src/gallium/drivers/i915/i915_screen.c b/src/gallium/drivers/i915/i915_screen.c
index 5f7e80538bc..2fe4d70348f 100644
--- a/src/gallium/drivers/i915/i915_screen.c
+++ b/src/gallium/drivers/i915/i915_screen.c
@@ -202,6 +202,7 @@ i915_get_param(struct pipe_screen *screen, enum pipe_cap cap)
    case PIPE_CAP_MIXED_FRAMEBUFFER_SIZES:
    case PIPE_CAP_POINT_SPRITE:
    case PIPE_CAP_PRIMITIVE_RESTART: /* draw module */
+   case PIPE_CAP_PRIMITIVE_RESTART_FIXED_INDEX:
    case PIPE_CAP_VERTEX_ELEMENT_INSTANCE_DIVISOR:
    case PIPE_CAP_BLEND_EQUATION_SEPARATE:
    case PIPE_CAP_TGSI_INSTANCEID:
diff --git a/src/gallium/drivers/iris/iris_screen.c b/src/gallium/drivers/iris/iris_screen.c
index 374713cdcb2..a506189be5c 100644
--- a/src/gallium/drivers/iris/iris_screen.c
+++ b/src/gallium/drivers/iris/iris_screen.c
@@ -109,6 +109,7 @@ iris_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
    case PIPE_CAP_FRAGMENT_SHADER_DERIVATIVES:
    case PIPE_CAP_VERTEX_SHADER_SATURATE:
    case PIPE_CAP_PRIMITIVE_RESTART:
+   case PIPE_CAP_PRIMITIVE_RESTART_FIXED_INDEX:
    case PIPE_CAP_INDEP_BLEND_ENABLE:
    case PIPE_CAP_INDEP_BLEND_FUNC:
    case PIPE_CAP_RGB_OVERRIDE_DST_ALPHA_BLEND:
diff --git a/src/gallium/drivers/llvmpipe/lp_screen.c b/src/gallium/drivers/llvmpipe/lp_screen.c
index 490646b4010..1aa6e46a821 100644
--- a/src/gallium/drivers/llvmpipe/lp_screen.c
+++ b/src/gallium/drivers/llvmpipe/lp_screen.c
@@ -171,6 +171,7 @@ llvmpipe_get_param(struct pipe_screen *screen, enum pipe_cap param)
    case PIPE_CAP_DEPTH_CLIP_DISABLE_SEPARATE:
       return 0;
    case PIPE_CAP_PRIMITIVE_RESTART:
+   case PIPE_CAP_PRIMITIVE_RESTART_FIXED_INDEX:
       return 1;
    case PIPE_CAP_DEPTH_CLIP_DISABLE:
       return 1;
diff --git a/src/gallium/drivers/nouveau/nv30/nv30_screen.c b/src/gallium/drivers/nouveau/nv30/nv30_screen.c
index 780377d6897..cee20003844 100644
--- a/src/gallium/drivers/nouveau/nv30/nv30_screen.c
+++ b/src/gallium/drivers/nouveau/nv30/nv30_screen.c
@@ -112,6 +112,7 @@ nv30_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
    case PIPE_CAP_TEXTURE_MIRROR_CLAMP:
    case PIPE_CAP_TEXTURE_MIRROR_CLAMP_TO_EDGE:
    case PIPE_CAP_PRIMITIVE_RESTART:
+   case PIPE_CAP_PRIMITIVE_RESTART_FIXED_INDEX:
       return (eng3d->oclass >= NV40_3D_CLASS) ? 1 : 0;
    /* unsupported */
    case PIPE_CAP_DEPTH_CLIP_DISABLE_SEPARATE:
diff --git a/src/gallium/drivers/nouveau/nv50/nv50_screen.c b/src/gallium/drivers/nouveau/nv50/nv50_screen.c
index 519d69047b3..3176164732a 100644
--- a/src/gallium/drivers/nouveau/nv50/nv50_screen.c
+++ b/src/gallium/drivers/nouveau/nv50/nv50_screen.c
@@ -191,6 +191,7 @@ nv50_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
    case PIPE_CAP_TGSI_FS_COORD_ORIGIN_UPPER_LEFT:
    case PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_HALF_INTEGER:
    case PIPE_CAP_PRIMITIVE_RESTART:
+   case PIPE_CAP_PRIMITIVE_RESTART_FIXED_INDEX:
    case PIPE_CAP_TGSI_INSTANCEID:
    case PIPE_CAP_VERTEX_ELEMENT_INSTANCE_DIVISOR:
    case PIPE_CAP_MIXED_COLORBUFFER_FORMATS:
diff --git a/src/gallium/drivers/nouveau/nvc0/nvc0_screen.c b/src/gallium/drivers/nouveau/nvc0/nvc0_screen.c
index 9e8a3e5c3e3..d71307d0a95 100644
--- a/src/gallium/drivers/nouveau/nvc0/nvc0_screen.c
+++ b/src/gallium/drivers/nouveau/nvc0/nvc0_screen.c
@@ -231,6 +231,7 @@ nvc0_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
    case PIPE_CAP_TGSI_FS_COORD_ORIGIN_UPPER_LEFT:
    case PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_HALF_INTEGER:
    case PIPE_CAP_PRIMITIVE_RESTART:
+   case PIPE_CAP_PRIMITIVE_RESTART_FIXED_INDEX:
    case PIPE_CAP_TGSI_INSTANCEID:
    case PIPE_CAP_VERTEX_ELEMENT_INSTANCE_DIVISOR:
    case PIPE_CAP_MIXED_COLORBUFFER_FORMATS:
diff --git a/src/gallium/drivers/panfrost/pan_screen.c b/src/gallium/drivers/panfrost/pan_screen.c
index 2fe09c51ab7..656a868bdf5 100644
--- a/src/gallium/drivers/panfrost/pan_screen.c
+++ b/src/gallium/drivers/panfrost/pan_screen.c
@@ -138,6 +138,7 @@ panfrost_get_param(struct pipe_screen *screen, enum pipe_cap param)
         case PIPE_CAP_TGSI_INSTANCEID:
         case PIPE_CAP_VERTEX_ELEMENT_INSTANCE_DIVISOR:
         case PIPE_CAP_PRIMITIVE_RESTART:
+        case PIPE_CAP_PRIMITIVE_RESTART_FIXED_INDEX:
                 return 1;
 
         case PIPE_CAP_MAX_STREAM_OUTPUT_BUFFERS:
diff --git a/src/gallium/drivers/r300/r300_screen.c b/src/gallium/drivers/r300/r300_screen.c
index d363990efbc..942666d526c 100644
--- a/src/gallium/drivers/r300/r300_screen.c
+++ b/src/gallium/drivers/r300/r300_screen.c
@@ -183,6 +183,7 @@ static int r300_get_param(struct pipe_screen* pscreen, enum pipe_cap param)
 
         /* SWTCL-only features. */
         case PIPE_CAP_PRIMITIVE_RESTART:
+        case PIPE_CAP_PRIMITIVE_RESTART_FIXED_INDEX:
         case PIPE_CAP_USER_VERTEX_BUFFERS:
         case PIPE_CAP_TGSI_VS_WINDOW_SPACE_POSITION:
             return !r300screen->caps.has_tcl;
diff --git a/src/gallium/drivers/r600/r600_pipe.c b/src/gallium/drivers/r600/r600_pipe.c
index a1a41cc3e5c..e006973f0c0 100644
--- a/src/gallium/drivers/r600/r600_pipe.c
+++ b/src/gallium/drivers/r600/r600_pipe.c
@@ -288,6 +288,7 @@ static int r600_get_param(struct pipe_screen* pscreen, enum pipe_cap param)
 	case PIPE_CAP_VERTEX_SHADER_SATURATE:
 	case PIPE_CAP_SEAMLESS_CUBE_MAP:
 	case PIPE_CAP_PRIMITIVE_RESTART:
+	case PIPE_CAP_PRIMITIVE_RESTART_FIXED_INDEX:
 	case PIPE_CAP_CONDITIONAL_RENDER:
 	case PIPE_CAP_TEXTURE_BARRIER:
 	case PIPE_CAP_VERTEX_COLOR_UNCLAMPED:
diff --git a/src/gallium/drivers/radeonsi/si_get.c b/src/gallium/drivers/radeonsi/si_get.c
index 9a24d391e7e..ba3e1064739 100644
--- a/src/gallium/drivers/radeonsi/si_get.c
+++ b/src/gallium/drivers/radeonsi/si_get.c
@@ -75,6 +75,7 @@ static int si_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
    case PIPE_CAP_VERTEX_SHADER_SATURATE:
    case PIPE_CAP_SEAMLESS_CUBE_MAP:
    case PIPE_CAP_PRIMITIVE_RESTART:
+   case PIPE_CAP_PRIMITIVE_RESTART_FIXED_INDEX:
    case PIPE_CAP_CONDITIONAL_RENDER:
    case PIPE_CAP_TEXTURE_BARRIER:
    case PIPE_CAP_INDEP_BLEND_ENABLE:
diff --git a/src/gallium/drivers/softpipe/sp_screen.c b/src/gallium/drivers/softpipe/sp_screen.c
index 95df0b24b9f..848ecc36f43 100644
--- a/src/gallium/drivers/softpipe/sp_screen.c
+++ b/src/gallium/drivers/softpipe/sp_screen.c
@@ -132,6 +132,7 @@ softpipe_get_param(struct pipe_screen *screen, enum pipe_cap param)
    case PIPE_CAP_MAX_VERTEX_ATTRIB_STRIDE:
       return 2048;
    case PIPE_CAP_PRIMITIVE_RESTART:
+   case PIPE_CAP_PRIMITIVE_RESTART_FIXED_INDEX:
       return 1;
    case PIPE_CAP_SHADER_STENCIL_EXPORT:
       return 1;
diff --git a/src/gallium/drivers/svga/svga_screen.c b/src/gallium/drivers/svga/svga_screen.c
index 1dc5319f572..5c758d365de 100644
--- a/src/gallium/drivers/svga/svga_screen.c
+++ b/src/gallium/drivers/svga/svga_screen.c
@@ -344,6 +344,7 @@ svga_get_param(struct pipe_screen *screen, enum pipe_cap param)
       return sws->have_vgpu10 ? 1024 : 0;
 
    case PIPE_CAP_PRIMITIVE_RESTART:
+   case PIPE_CAP_PRIMITIVE_RESTART_FIXED_INDEX:
       return 1; /* may be a sw fallback, depending on restart index */
 
    case PIPE_CAP_GENERATE_MIPMAP:
diff --git a/src/gallium/drivers/swr/swr_screen.cpp b/src/gallium/drivers/swr/swr_screen.cpp
index 9e8ee45bfb5..dbee73afd36 100644
--- a/src/gallium/drivers/swr/swr_screen.cpp
+++ b/src/gallium/drivers/swr/swr_screen.cpp
@@ -253,6 +253,7 @@ swr_get_param(struct pipe_screen *screen, enum pipe_cap param)
    case PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_INTEGER:
    case PIPE_CAP_DEPTH_CLIP_DISABLE:
    case PIPE_CAP_PRIMITIVE_RESTART:
+   case PIPE_CAP_PRIMITIVE_RESTART_FIXED_INDEX:
    case PIPE_CAP_TGSI_INSTANCEID:
    case PIPE_CAP_VERTEX_ELEMENT_INSTANCE_DIVISOR:
    case PIPE_CAP_START_INSTANCE:
diff --git a/src/gallium/drivers/v3d/v3d_screen.c b/src/gallium/drivers/v3d/v3d_screen.c
index b808b56ffcd..b9a4fdc5fc8 100644
--- a/src/gallium/drivers/v3d/v3d_screen.c
+++ b/src/gallium/drivers/v3d/v3d_screen.c
@@ -124,6 +124,7 @@ v3d_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
         case PIPE_CAP_FRAGMENT_SHADER_DERIVATIVES:
         case PIPE_CAP_VERTEX_SHADER_SATURATE:
         case PIPE_CAP_PRIMITIVE_RESTART:
+        case PIPE_CAP_PRIMITIVE_RESTART_FIXED_INDEX:
         case PIPE_CAP_OCCLUSION_QUERY:
         case PIPE_CAP_POINT_SPRITE:
         case PIPE_CAP_STREAM_OUTPUT_PAUSE_RESUME:
diff --git a/src/gallium/drivers/virgl/virgl_screen.c b/src/gallium/drivers/virgl/virgl_screen.c
index eb3712b24cd..7a4455bdb88 100644
--- a/src/gallium/drivers/virgl/virgl_screen.c
+++ b/src/gallium/drivers/virgl/virgl_screen.c
@@ -126,6 +126,7 @@ virgl_get_param(struct pipe_screen *screen, enum pipe_cap param)
    case PIPE_CAP_MAX_STREAM_OUTPUT_INTERLEAVED_COMPONENTS:
       return 16*4;
    case PIPE_CAP_PRIMITIVE_RESTART:
+   case PIPE_CAP_PRIMITIVE_RESTART_FIXED_INDEX:
       return vscreen->caps.caps.v1.bset.primitive_restart;
    case PIPE_CAP_SHADER_STENCIL_EXPORT:
       return vscreen->caps.caps.v1.bset.shader_stencil_export;
diff --git a/src/gallium/include/pipe/p_defines.h b/src/gallium/include/pipe/p_defines.h
index 6354e136597..9ec36e4ac7b 100644
--- a/src/gallium/include/pipe/p_defines.h
+++ b/src/gallium/include/pipe/p_defines.h
@@ -724,6 +724,10 @@ enum pipe_cap
    PIPE_CAP_BLEND_EQUATION_SEPARATE,
    PIPE_CAP_MAX_STREAM_OUTPUT_BUFFERS,
    PIPE_CAP_PRIMITIVE_RESTART,
+   /** subset of PRIMITIVE_RESTART where the restart index is always the fixed
+    * maximum value for the index type
+    */
+   PIPE_CAP_PRIMITIVE_RESTART_FIXED_INDEX,
    /** blend enables and write masks per rendertarget */
    PIPE_CAP_INDEP_BLEND_ENABLE,
    /** different blend funcs per rendertarget */