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, 3 insertions, 0 deletions

diff --git a/src/compiler/glsl/ast_to_hir.cpp b/src/compiler/glsl/ast_to_hir.cpp
index 5cdeb94720b..7abb8199e1e 100644
--- a/src/compiler/glsl/ast_to_hir.cpp
+++ b/src/compiler/glsl/ast_to_hir.cpp
@@ -1108,12 +1108,15 @@ do_comparison(void *mem_ctx, int operation, ir_rvalue *op0, ir_rvalue *op1)
 
    switch (op0->type->base_type) {
    case GLSL_TYPE_FLOAT:
+   case GLSL_TYPE_FLOAT16:
    case GLSL_TYPE_UINT:
    case GLSL_TYPE_INT:
    case GLSL_TYPE_BOOL:
    case GLSL_TYPE_DOUBLE:
    case GLSL_TYPE_UINT64:
    case GLSL_TYPE_INT64:
+   case GLSL_TYPE_UINT16:
+   case GLSL_TYPE_INT16:
       return new(mem_ctx) ir_expression(operation, op0, op1);
 
    case GLSL_TYPE_ARRAY: {