[Mesa-dev] [PATCH v5 19/29] glsl: Support double inouts

[Ilia Mirkin]

From: Dave Airlie <airlied at gmail.com>

Signed-off-by: Dave Airlie <airlied at redhat.com>
---
 src/glsl/ir_set_program_inouts.cpp | 28 ++++++++++++++++++++++++----
 1 file changed, 24 insertions(+), 4 deletions(-)

diff --git a/src/glsl/ir_set_program_inouts.cpp b/src/glsl/ir_set_program_inouts.cpp
index 97ead75..e877a20 100644
--- a/src/glsl/ir_set_program_inouts.cpp
+++ b/src/glsl/ir_set_program_inouts.cpp
@@ -81,6 +81,13 @@ is_shader_inout(ir_variable *var)
           var->data.mode == ir_var_system_value;
 }
 
+static inline bool
+is_dual_slot(ir_variable *var)
+{
+   const glsl_type *type = var->type->without_array();
+   return type == glsl_type::dvec4_type || type == glsl_type::dvec3_type;
+}
+
 static void
 mark(struct gl_program *prog, ir_variable *var, int offset, int len,
      bool is_fragment_shader)
@@ -94,19 +101,32 @@ mark(struct gl_program *prog, ir_variable *var, int offset, int len,
     */
 
    for (int i = 0; i < len; i++) {
-      GLbitfield64 bitfield =
-         BITFIELD64_BIT(var->data.location + var->data.index + offset + i);
+      bool dual_slot = is_dual_slot(var);
+      int idx = var->data.location + var->data.index + offset + i;
+      GLbitfield64 bitfield = BITFIELD64_BIT(idx);
+
+      /* dvec3 and dvec4 take up 2 slots */
+      if (dual_slot) {
+         idx += i;
+         bitfield |= bitfield << 1;
+      }
       if (var->data.mode == ir_var_shader_in) {
 	 prog->InputsRead |= bitfield;
          if (is_fragment_shader) {
             gl_fragment_program *fprog = (gl_fragment_program *) prog;
-            fprog->InterpQualifier[var->data.location +
-                                   var->data.index + offset + i] =
+            fprog->InterpQualifier[idx] =
                (glsl_interp_qualifier) var->data.interpolation;
             if (var->data.centroid)
                fprog->IsCentroid |= bitfield;
             if (var->data.sample)
                fprog->IsSample |= bitfield;
+
+            /* Set the InterpQualifier of the next slot to the same as the
+             * current one, since dvec3 and dvec4 spans 2 slots.
+             */
+            if (dual_slot)
+               fprog->InterpQualifier[idx + 1] =
+                  (glsl_interp_qualifier) var->data.interpolation;
          }
       } else if (var->data.mode == ir_var_system_value) {
          prog->SystemValuesRead |= bitfield;
-- 
2.0.5