gallium/tgsi: Redefine the TGSI_TEXTURE_UNKNOWN texture target.

Some code relies on the existing of an invalid texture target. It seems
safer to bring it back than to deal with unintended consequences.

This partially reverts commit a4ebb04214bab1cd9bd41967232ec89441e31744.

Reviewed-by: Brian Paul <[email protected]>

5 files changed, 8 insertions, 4 deletions

diff --git a/src/gallium/auxiliary/tgsi/tgsi_build.c b/src/gallium/auxiliary/tgsi/tgsi_build.c
index 1d3c4bcdf71..869faa1b420 100644
--- a/src/gallium/auxiliary/tgsi/tgsi_build.c
+++ b/src/gallium/auxiliary/tgsi/tgsi_build.c
@@ -707,7 +707,7 @@ tgsi_default_instruction_texture( void )
 {
    struct tgsi_instruction_texture instruction_texture;
 
-   instruction_texture.Texture = TGSI_BUFFER;
+   instruction_texture.Texture = TGSI_TEXTURE_UNKNOWN;
    instruction_texture.NumOffsets = 0;
    instruction_texture.Padding = 0;
 
diff --git a/src/gallium/auxiliary/tgsi/tgsi_strings.c b/src/gallium/auxiliary/tgsi/tgsi_strings.c
index d7b74ba2b8b..b5fd1fc0a65 100644
--- a/src/gallium/auxiliary/tgsi/tgsi_strings.c
+++ b/src/gallium/auxiliary/tgsi/tgsi_strings.c
@@ -96,7 +96,8 @@ const char *tgsi_texture_names[TGSI_TEXTURE_COUNT] =
    "2DARRAY",
    "SHADOW1DARRAY",
    "SHADOW2DARRAY",
-   "SHADOWCUBE"
+   "SHADOWCUBE",
+   "UNKNOWN"
 };
 
 const char *tgsi_property_names[TGSI_PROPERTY_COUNT] =
diff --git a/src/gallium/auxiliary/util/u_blitter.c b/src/gallium/auxiliary/util/u_blitter.c
index 28e73832540..d0b9187d1f9 100644
--- a/src/gallium/auxiliary/util/u_blitter.c
+++ b/src/gallium/auxiliary/util/u_blitter.c
@@ -674,7 +674,7 @@ pipe_tex_to_tgsi_tex(enum pipe_texture_target pipe_tex_target)
       return TGSI_TEXTURE_2D_ARRAY;
    default:
       assert(0 && "unexpected texture target");
-      return 0;
+      return TGSI_TEXTURE_UNKNOWN;
    }
 }
 
diff --git a/src/gallium/drivers/nv50/codegen/nv50_ir_from_tgsi.cpp b/src/gallium/drivers/nv50/codegen/nv50_ir_from_tgsi.cpp
index 955eb92ec3c..ba08493c282 100644
--- a/src/gallium/drivers/nv50/codegen/nv50_ir_from_tgsi.cpp
+++ b/src/gallium/drivers/nv50/codegen/nv50_ir_from_tgsi.cpp
@@ -349,6 +349,8 @@ static nv50_ir::TexTarget translateTexture(uint tex)
    NV50_IR_TEX_TARG_CASE(SHADOWRECT, RECT_SHADOW);
    case TGSI_BUFFER:
       return nv50_ir::TEX_TARGET_BUFFER;
+
+   case TGSI_TEXTURE_UNKNOWN:
    default:
       assert(!"invalid texture target");
       return nv50_ir::TEX_TARGET_2D;
diff --git a/src/gallium/include/pipe/p_shader_tokens.h b/src/gallium/include/pipe/p_shader_tokens.h
index 5325e43896c..615a89a2206 100644
--- a/src/gallium/include/pipe/p_shader_tokens.h
+++ b/src/gallium/include/pipe/p_shader_tokens.h
@@ -504,7 +504,8 @@ struct tgsi_instruction_label
 #define TGSI_TEXTURE_SHADOW1D_ARRAY 11
 #define TGSI_TEXTURE_SHADOW2D_ARRAY 12
 #define TGSI_TEXTURE_SHADOWCUBE     13
-#define TGSI_TEXTURE_COUNT          14
+#define TGSI_TEXTURE_UNKNOWN        14
+#define TGSI_TEXTURE_COUNT          15
 
 struct tgsi_instruction_texture
 {