glsl: add gl_BoundingBox and associated varying slots

Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>

4 files changed, 21 insertions, 1 deletions

diff --git a/src/compiler/glsl/builtin_variables.cpp b/src/compiler/glsl/builtin_variables.cpp
index f4ddeb9..90278d6 100644
--- a/src/compiler/glsl/builtin_variables.cpp
+++ b/src/compiler/glsl/builtin_variables.cpp
@@ -1045,6 +1045,18 @@ builtin_variable_generator::generate_tcs_special_vars()
               "gl_TessLevelOuter")->data.patch = 1;
    add_output(VARYING_SLOT_TESS_LEVEL_INNER, array(float_t, 2),
               "gl_TessLevelInner")->data.patch = 1;
+   /* XXX What to do if multiple are flipped on? */
+   int bbox_slot = state->ctx->Const.NoPrimitiveBoundingBoxOutput ? -1 :
+      VARYING_SLOT_BOUNDING_BOX0;
+   if (state->EXT_primitive_bounding_box_enable)
+      add_output(bbox_slot, array(vec4_t, 2), "gl_BoundingBoxEXT")
+         ->data.patch = 1;
+   if (state->OES_primitive_bounding_box_enable)
+      add_output(bbox_slot, array(vec4_t, 2), "gl_BoundingBoxOES")
+         ->data.patch = 1;
+   if (state->is_version(0, 320) || state->ARB_ES3_2_compatibility_enable)
+      add_output(bbox_slot, array(vec4_t, 2), "gl_BoundingBox")
+         ->data.patch = 1;
 }
 
 
diff --git a/src/compiler/glsl/ir_set_program_inouts.cpp b/src/compiler/glsl/ir_set_program_inouts.cpp
index 4f6c886..48ed3c5 100644
--- a/src/compiler/glsl/ir_set_program_inouts.cpp
+++ b/src/compiler/glsl/ir_set_program_inouts.cpp
@@ -99,7 +99,9 @@ mark(struct gl_program *prog, ir_variable *var, int offset, int len,
       int idx = var->data.location + offset + i;
       bool is_patch_generic = var->data.patch &&
                               idx != VARYING_SLOT_TESS_LEVEL_INNER &&
-                              idx != VARYING_SLOT_TESS_LEVEL_OUTER;
+                              idx != VARYING_SLOT_TESS_LEVEL_OUTER &&
+                              idx != VARYING_SLOT_BOUNDING_BOX0 &&
+                              idx != VARYING_SLOT_BOUNDING_BOX1;
       GLbitfield64 bitfield;
 
       if (is_patch_generic) {
diff --git a/src/compiler/shader_enums.c b/src/compiler/shader_enums.c
index 00261d1..729a358 100644
--- a/src/compiler/shader_enums.c
+++ b/src/compiler/shader_enums.c
@@ -158,6 +158,8 @@ gl_varying_slot_name(gl_varying_slot slot)
       ENUM(VARYING_SLOT_PNTC),
       ENUM(VARYING_SLOT_TESS_LEVEL_OUTER),
       ENUM(VARYING_SLOT_TESS_LEVEL_INNER),
+      ENUM(VARYING_SLOT_BOUNDING_BOX0),
+      ENUM(VARYING_SLOT_BOUNDING_BOX1),
       ENUM(VARYING_SLOT_VAR0),
       ENUM(VARYING_SLOT_VAR1),
       ENUM(VARYING_SLOT_VAR2),
diff --git a/src/compiler/shader_enums.h b/src/compiler/shader_enums.h
index e128b17..c3a62e0 100644
--- a/src/compiler/shader_enums.h
+++ b/src/compiler/shader_enums.h
@@ -214,6 +214,8 @@ typedef enum
    VARYING_SLOT_PNTC, /* FS only */
    VARYING_SLOT_TESS_LEVEL_OUTER, /* Only appears as TCS output. */
    VARYING_SLOT_TESS_LEVEL_INNER, /* Only appears as TCS output. */
+   VARYING_SLOT_BOUNDING_BOX0, /* Only appears as TCS output. */
+   VARYING_SLOT_BOUNDING_BOX1, /* Only appears as TCS output. */
    VARYING_SLOT_VAR0, /* First generic varying slot */
    /* the remaining are simply for the benefit of gl_varying_slot_name()
     * and not to be construed as an upper bound:
@@ -294,6 +296,8 @@ const char *gl_varying_slot_name(gl_varying_slot slot);
 #define VARYING_BIT_PNTC BITFIELD64_BIT(VARYING_SLOT_PNTC)
 #define VARYING_BIT_TESS_LEVEL_OUTER BITFIELD64_BIT(VARYING_SLOT_TESS_LEVEL_OUTER)
 #define VARYING_BIT_TESS_LEVEL_INNER BITFIELD64_BIT(VARYING_SLOT_TESS_LEVEL_INNER)
+#define VARYING_BIT_BOUNDING_BOX0 BITFIELD64_BIT(VARYING_SLOT_BOUNDING_BOX0)
+#define VARYING_BIT_BOUNDING_BOX1 BITFIELD64_BIT(VARYING_SLOT_BOUNDING_BOX1)
 #define VARYING_BIT_VAR(V) BITFIELD64_BIT(VARYING_SLOT_VAR0 + (V))
 /*@}*/