glsl: Add 16-bit types

Adds new INT16, UINT16 and FLOAT16 base types.

The corresponding GL types for half floats were reused from the
AMD_gpu_shader_half_float extension. The int16 and uint16 types come from
NV_gpu_shader_5 extension.

This adds the builtins and the lexer support.

To avoid a bunch of warnings due to cases not handled in switch, the
new types have been added to a few places using same behavior as
their 32-bit counterparts, except for a few trivial cases where they are
already handled properly. Subsequent patches in this set will provide
correct 16-bit implementations when needed.

v2: * Use FLOAT16 instead of HALF_FLOAT as name of the base type.
    * Removed float16_t from builtin types.
    * Don't copy 16-bit types as if they were 32-bit values in
      copy_constant_to_storage().
    * Use get_scalar_type() instead of adding a new custom switch
      statement.
    (Jason Ekstrand)
v3: Use GL_FLOAT16_NV instead of GL_HALF_FLOAT for consistency
    (Ilia Mirkin)
v4: Add missing 16-bit base types support in glsl_to_nir (Eduardo Lima).
v5: Fix coding style (Topi Poholainen).

Signed-off-by: Jose Maria Casanova Crespo <[email protected]>
Signed-off-by: Eduardo Lima <[email protected]>
Signed-off-by: Alejandro Piñeiro <[email protected]>
Reviewed-by: Jason Ekstrand <[email protected]>
Reviewed-by: Nicolai Hähnle <[email protected]>

1 files changed, 6 insertions, 0 deletions

diff --git a/src/mesa/program/ir_to_mesa.cpp b/src/mesa/program/ir_to_mesa.cpp
index aa8b6d7084b..ea74539cd76 100644
--- a/src/mesa/program/ir_to_mesa.cpp
+++ b/src/mesa/program/ir_to_mesa.cpp
@@ -507,7 +507,10 @@ storage_type_size(const struct glsl_type *type, bool bindless)
    switch (type->base_type) {
    case GLSL_TYPE_UINT:
    case GLSL_TYPE_INT:
+   case GLSL_TYPE_UINT16:
+   case GLSL_TYPE_INT16:
    case GLSL_TYPE_FLOAT:
+   case GLSL_TYPE_FLOAT16:
    case GLSL_TYPE_BOOL:
       if (type->is_matrix()) {
 	 return type->matrix_columns;
@@ -2531,6 +2534,7 @@ _mesa_associate_uniform_storage(struct gl_context *ctx,
                dmul *= 2;
             /* fallthrough */
          case GLSL_TYPE_UINT:
+         case GLSL_TYPE_UINT16:
             assert(ctx->Const.NativeIntegers);
             format = uniform_native;
             columns = 1;
@@ -2540,6 +2544,7 @@ _mesa_associate_uniform_storage(struct gl_context *ctx,
                dmul *= 2;
             /* fallthrough */
          case GLSL_TYPE_INT:
+         case GLSL_TYPE_INT16:
             format =
                (ctx->Const.NativeIntegers) ? uniform_native : uniform_int_float;
             columns = 1;
@@ -2549,6 +2554,7 @@ _mesa_associate_uniform_storage(struct gl_context *ctx,
                dmul *= 2;
             /* fallthrough */
          case GLSL_TYPE_FLOAT:
+         case GLSL_TYPE_FLOAT16:
             format = uniform_native;
             columns = storage->type->matrix_columns;
             break;