gallium: create TGSI_PROPERTY to disable viewport and clipping

Marek v2: add a cap

Signed-off-by: Marek Olšák <[email protected]>

19 files changed, 49 insertions, 1 deletions

diff --git a/src/gallium/auxiliary/tgsi/tgsi_strings.c b/src/gallium/auxiliary/tgsi/tgsi_strings.c
index 34dec4f8a3e..713631fbec4 100644
--- a/src/gallium/auxiliary/tgsi/tgsi_strings.c
+++ b/src/gallium/auxiliary/tgsi/tgsi_strings.c
@@ -122,6 +122,7 @@ const char *tgsi_property_names[TGSI_PROPERTY_COUNT] =
    "FS_DEPTH_LAYOUT",
    "VS_PROHIBIT_UCPS",
    "GS_INVOCATIONS",
+   "VS_POSITION_WINDOW_SPACE"
 };
 
 const char *tgsi_type_names[5] =
diff --git a/src/gallium/auxiliary/tgsi/tgsi_ureg.c b/src/gallium/auxiliary/tgsi/tgsi_ureg.c
index 2bf93ee6adb..bd0a3f79fbd 100644
--- a/src/gallium/auxiliary/tgsi/tgsi_ureg.c
+++ b/src/gallium/auxiliary/tgsi/tgsi_ureg.c
@@ -173,6 +173,7 @@ struct ureg_program
    unsigned char property_fs_coord_pixel_center; /* = TGSI_FS_COORD_PIXEL_CENTER_* */
    unsigned char property_fs_color0_writes_all_cbufs; /* = TGSI_FS_COLOR0_WRITES_ALL_CBUFS * */
    unsigned char property_fs_depth_layout; /* TGSI_FS_DEPTH_LAYOUT */
+   boolean property_vs_window_space_position; /* TGSI_VS_WINDOW_SPACE_POSITION */
 
    unsigned nr_addrs;
    unsigned nr_preds;
@@ -331,6 +332,13 @@ ureg_property_fs_depth_layout(struct ureg_program *ureg,
    ureg->property_fs_depth_layout = fs_depth_layout;
 }
 
+void
+ureg_property_vs_window_space_position(struct ureg_program *ureg,
+                                       boolean vs_window_space_position)
+{
+   ureg->property_vs_window_space_position = vs_window_space_position;
+}
+
 struct ureg_src
 ureg_DECL_fs_input_cyl_centroid(struct ureg_program *ureg,
                        unsigned semantic_name,
@@ -1508,6 +1516,14 @@ static void emit_decls( struct ureg_program *ureg )
                     ureg->property_fs_depth_layout);
    }
 
+   if (ureg->property_vs_window_space_position) {
+      assert(ureg->processor == TGSI_PROCESSOR_VERTEX);
+
+      emit_property(ureg,
+                    TGSI_PROPERTY_VS_WINDOW_SPACE_POSITION,
+                    ureg->property_vs_window_space_position);
+   }
+
    if (ureg->processor == TGSI_PROCESSOR_VERTEX) {
       for (i = 0; i < UREG_MAX_INPUT; i++) {
          if (ureg->vs_inputs[i/32] & (1 << (i%32))) {
diff --git a/src/gallium/auxiliary/tgsi/tgsi_ureg.h b/src/gallium/auxiliary/tgsi/tgsi_ureg.h
index a0a50b7220e..28edea6cdae 100644
--- a/src/gallium/auxiliary/tgsi/tgsi_ureg.h
+++ b/src/gallium/auxiliary/tgsi/tgsi_ureg.h
@@ -184,6 +184,10 @@ void
 ureg_property_fs_depth_layout(struct ureg_program *ureg,
                               unsigned fs_depth_layout);
 
+void
+ureg_property_vs_window_space_position(struct ureg_program *ureg,
+                                       boolean vs_window_space_position);
+
 
 /***********************************************************************
  * Build shader declarations:
diff --git a/src/gallium/docs/source/screen.rst b/src/gallium/docs/source/screen.rst
index b2922572a5b..b8e356f97bb 100644
--- a/src/gallium/docs/source/screen.rst
+++ b/src/gallium/docs/source/screen.rst
@@ -202,6 +202,9 @@ The integer capabilities:
   implemented.
 * ``PIPE_CAP_TEXTURE_GATHER_OFFSETS``: Whether the ``TG4`` instruction can
   accept 4 offsets.
+* ``PIPE_CAP_TGSI_VS_WINDOW_SPACE_POSITION``: Whether
+  TGSI_PROPERTY_VS_WINDOW_SPACE_POSITION is supported, which disables clipping
+  and viewport transformation.
 
 
 .. _pipe_capf:
diff --git a/src/gallium/docs/source/tgsi.rst b/src/gallium/docs/source/tgsi.rst
index 9500b9d615e..2ca3c3bbb5d 100644
--- a/src/gallium/docs/source/tgsi.rst
+++ b/src/gallium/docs/source/tgsi.rst
@@ -2848,6 +2848,15 @@ input primitive. Each invocation will have a different
 TGSI_SEMANTIC_INVOCATIONID system value set. If not specified, assumed to
 be 1.
 
+VS_WINDOW_SPACE_POSITION
+""""""""""""""""""""""""""
+If this property is set on the vertex shader, the TGSI_SEMANTIC_POSITION output
+is assumed to contain window space coordinates.
+Division of X,Y,Z by W and the viewport transformation are disabled, and 1/W is
+directly taken from the 4-th component of the shader output.
+Naturally, clipping is not performed on window coordinates either.
+The effect of this property is undefined if a geometry or tessellation shader
+are in use.
 
 Texture Sampling and Texture Formats
 ------------------------------------
diff --git a/src/gallium/drivers/freedreno/freedreno_screen.c b/src/gallium/drivers/freedreno/freedreno_screen.c
index 362fb807814..e7a185df00d 100644
--- a/src/gallium/drivers/freedreno/freedreno_screen.c
+++ b/src/gallium/drivers/freedreno/freedreno_screen.c
@@ -214,6 +214,7 @@ fd_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
 	case PIPE_CAP_TEXTURE_QUERY_LOD:
 	case PIPE_CAP_SAMPLE_SHADING:
 	case PIPE_CAP_TEXTURE_GATHER_OFFSETS:
+	case PIPE_CAP_TGSI_VS_WINDOW_SPACE_POSITION:
 		return 0;
 
 	/* Stream output. */
diff --git a/src/gallium/drivers/i915/i915_screen.c b/src/gallium/drivers/i915/i915_screen.c
index ad8a23cae22..6ce6090e817 100644
--- a/src/gallium/drivers/i915/i915_screen.c
+++ b/src/gallium/drivers/i915/i915_screen.c
@@ -222,6 +222,7 @@ i915_get_param(struct pipe_screen *screen, enum pipe_cap cap)
    case PIPE_CAP_TEXTURE_QUERY_LOD:
    case PIPE_CAP_SAMPLE_SHADING:
    case PIPE_CAP_TEXTURE_GATHER_OFFSETS:
+   case PIPE_CAP_TGSI_VS_WINDOW_SPACE_POSITION:
       return 0;
 
    case PIPE_CAP_MAX_DUAL_SOURCE_RENDER_TARGETS:
diff --git a/src/gallium/drivers/ilo/ilo_screen.c b/src/gallium/drivers/ilo/ilo_screen.c
index 0a1c56d51b9..b08ae206a7d 100644
--- a/src/gallium/drivers/ilo/ilo_screen.c
+++ b/src/gallium/drivers/ilo/ilo_screen.c
@@ -441,6 +441,7 @@ ilo_get_param(struct pipe_screen *screen, enum pipe_cap param)
    case PIPE_CAP_TEXTURE_QUERY_LOD:
    case PIPE_CAP_SAMPLE_SHADING:
    case PIPE_CAP_TEXTURE_GATHER_OFFSETS:
+   case PIPE_CAP_TGSI_VS_WINDOW_SPACE_POSITION:
       return 0;
 
    default:
diff --git a/src/gallium/drivers/llvmpipe/lp_screen.c b/src/gallium/drivers/llvmpipe/lp_screen.c
index e23680251f8..a6b712a8126 100644
--- a/src/gallium/drivers/llvmpipe/lp_screen.c
+++ b/src/gallium/drivers/llvmpipe/lp_screen.c
@@ -243,6 +243,7 @@ llvmpipe_get_param(struct pipe_screen *screen, enum pipe_cap param)
    case PIPE_CAP_TEXTURE_QUERY_LOD:
    case PIPE_CAP_SAMPLE_SHADING:
    case PIPE_CAP_TEXTURE_GATHER_OFFSETS:
+   case PIPE_CAP_TGSI_VS_WINDOW_SPACE_POSITION:
       return 0;
    case PIPE_CAP_FAKE_SW_MSAA:
 	return 1;
diff --git a/src/gallium/drivers/nouveau/nv30/nv30_screen.c b/src/gallium/drivers/nouveau/nv30/nv30_screen.c
index 7157e0cc57a..fb9378c4ffe 100644
--- a/src/gallium/drivers/nouveau/nv30/nv30_screen.c
+++ b/src/gallium/drivers/nouveau/nv30/nv30_screen.c
@@ -137,6 +137,7 @@ nv30_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
    case PIPE_CAP_TEXTURE_QUERY_LOD:
    case PIPE_CAP_SAMPLE_SHADING:
    case PIPE_CAP_TEXTURE_GATHER_OFFSETS:
+   case PIPE_CAP_TGSI_VS_WINDOW_SPACE_POSITION:
       return 0;
    case PIPE_CAP_VERTEX_BUFFER_OFFSET_4BYTE_ALIGNED_ONLY:
    case PIPE_CAP_VERTEX_BUFFER_STRIDE_4BYTE_ALIGNED_ONLY:
diff --git a/src/gallium/drivers/nouveau/nv50/nv50_screen.c b/src/gallium/drivers/nouveau/nv50/nv50_screen.c
index 36a4ad1da09..015f13918cb 100644
--- a/src/gallium/drivers/nouveau/nv50/nv50_screen.c
+++ b/src/gallium/drivers/nouveau/nv50/nv50_screen.c
@@ -199,6 +199,7 @@ nv50_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
    case PIPE_CAP_TEXTURE_GATHER_SM5:
    case PIPE_CAP_FAKE_SW_MSAA:
    case PIPE_CAP_TEXTURE_GATHER_OFFSETS:
+   case PIPE_CAP_TGSI_VS_WINDOW_SPACE_POSITION:
       return 0;
    case PIPE_CAP_MAX_VIEWPORTS:
       return NV50_MAX_VIEWPORTS;
diff --git a/src/gallium/drivers/nouveau/nvc0/nvc0_screen.c b/src/gallium/drivers/nouveau/nvc0/nvc0_screen.c
index 24f14fb4150..0537542e6ce 100644
--- a/src/gallium/drivers/nouveau/nvc0/nvc0_screen.c
+++ b/src/gallium/drivers/nouveau/nvc0/nvc0_screen.c
@@ -190,6 +190,8 @@ nvc0_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
       return 1;
    case PIPE_CAP_MAX_TEXTURE_GATHER_COMPONENTS:
       return 4;
+   case PIPE_CAP_TGSI_VS_WINDOW_SPACE_POSITION:
+      return 0;
    default:
       NOUVEAU_ERR("unknown PIPE_CAP %d\n", param);
       return 0;
diff --git a/src/gallium/drivers/r300/r300_screen.c b/src/gallium/drivers/r300/r300_screen.c
index 2c0fc4945df..82d30e78042 100644
--- a/src/gallium/drivers/r300/r300_screen.c
+++ b/src/gallium/drivers/r300/r300_screen.c
@@ -175,6 +175,7 @@ static int r300_get_param(struct pipe_screen* pscreen, enum pipe_cap param)
         case PIPE_CAP_FAKE_SW_MSAA:
         case PIPE_CAP_SAMPLE_SHADING:
         case PIPE_CAP_TEXTURE_GATHER_OFFSETS:
+        case PIPE_CAP_TGSI_VS_WINDOW_SPACE_POSITION:
             return 0;
 
         /* SWTCL-only features. */
diff --git a/src/gallium/drivers/r600/r600_pipe.c b/src/gallium/drivers/r600/r600_pipe.c
index 368307c8e9d..f834a9de15e 100644
--- a/src/gallium/drivers/r600/r600_pipe.c
+++ b/src/gallium/drivers/r600/r600_pipe.c
@@ -316,6 +316,7 @@ static int r600_get_param(struct pipe_screen* pscreen, enum pipe_cap param)
 	case PIPE_CAP_TEXTURE_QUERY_LOD:
 	case PIPE_CAP_SAMPLE_SHADING:
 	case PIPE_CAP_TEXTURE_GATHER_OFFSETS:
+	case PIPE_CAP_TGSI_VS_WINDOW_SPACE_POSITION:
 		return 0;
 
 	/* Stream output. */
diff --git a/src/gallium/drivers/radeonsi/si_pipe.c b/src/gallium/drivers/radeonsi/si_pipe.c
index 07c00cf33d0..d3745465a3e 100644
--- a/src/gallium/drivers/radeonsi/si_pipe.c
+++ b/src/gallium/drivers/radeonsi/si_pipe.c
@@ -245,6 +245,7 @@ static int si_get_param(struct pipe_screen* pscreen, enum pipe_cap param)
 	case PIPE_CAP_TEXTURE_QUERY_LOD:
 	case PIPE_CAP_SAMPLE_SHADING:
 	case PIPE_CAP_TEXTURE_GATHER_OFFSETS:
+	case PIPE_CAP_TGSI_VS_WINDOW_SPACE_POSITION:
 		return 0;
 
 	case PIPE_CAP_TEXTURE_BORDER_COLOR_QUIRK:
diff --git a/src/gallium/drivers/softpipe/sp_screen.c b/src/gallium/drivers/softpipe/sp_screen.c
index 316c512da39..34dbb91d746 100644
--- a/src/gallium/drivers/softpipe/sp_screen.c
+++ b/src/gallium/drivers/softpipe/sp_screen.c
@@ -191,6 +191,7 @@ softpipe_get_param(struct pipe_screen *screen, enum pipe_cap param)
    case PIPE_CAP_TEXTURE_QUERY_LOD:
    case PIPE_CAP_SAMPLE_SHADING:
    case PIPE_CAP_TEXTURE_GATHER_OFFSETS:
+   case PIPE_CAP_TGSI_VS_WINDOW_SPACE_POSITION:
       return 0;
    case PIPE_CAP_FAKE_SW_MSAA:
       return 1;
diff --git a/src/gallium/drivers/svga/svga_screen.c b/src/gallium/drivers/svga/svga_screen.c
index 458fbd04ce4..4e1e3316bca 100644
--- a/src/gallium/drivers/svga/svga_screen.c
+++ b/src/gallium/drivers/svga/svga_screen.c
@@ -275,6 +275,7 @@ svga_get_param(struct pipe_screen *screen, enum pipe_cap param)
    case PIPE_CAP_TEXTURE_QUERY_LOD:
    case PIPE_CAP_SAMPLE_SHADING:
    case PIPE_CAP_TEXTURE_GATHER_OFFSETS:
+   case PIPE_CAP_TGSI_VS_WINDOW_SPACE_POSITION:
       return 0;
    case PIPE_CAP_MIN_MAP_BUFFER_ALIGNMENT:
       return 64;
diff --git a/src/gallium/include/pipe/p_defines.h b/src/gallium/include/pipe/p_defines.h
index 4024470dac7..b91845aec18 100644
--- a/src/gallium/include/pipe/p_defines.h
+++ b/src/gallium/include/pipe/p_defines.h
@@ -558,6 +558,7 @@ enum pipe_cap {
    PIPE_CAP_MAX_TEXTURE_GATHER_OFFSET = 96,
    PIPE_CAP_SAMPLE_SHADING = 97,
    PIPE_CAP_TEXTURE_GATHER_OFFSETS = 98,
+   PIPE_CAP_TGSI_VS_WINDOW_SPACE_POSITION = 99
 };
 
 #define PIPE_QUIRK_TEXTURE_BORDER_COLOR_SWIZZLE_NV50 (1 << 0)
diff --git a/src/gallium/include/pipe/p_shader_tokens.h b/src/gallium/include/pipe/p_shader_tokens.h
index d095bd3a8f5..9261b79d91e 100644
--- a/src/gallium/include/pipe/p_shader_tokens.h
+++ b/src/gallium/include/pipe/p_shader_tokens.h
@@ -237,7 +237,8 @@ union tgsi_immediate_data
 #define TGSI_PROPERTY_FS_DEPTH_LAYOUT        6
 #define TGSI_PROPERTY_VS_PROHIBIT_UCPS       7
 #define TGSI_PROPERTY_GS_INVOCATIONS         8
-#define TGSI_PROPERTY_COUNT                  9
+#define TGSI_PROPERTY_VS_WINDOW_SPACE_POSITION 9
+#define TGSI_PROPERTY_COUNT                  10
 
 struct tgsi_property {
    unsigned Type         : 4;  /**< TGSI_TOKEN_TYPE_PROPERTY */