glsl: add forgotten textureOffset function for sampler2DArrayShadow

This was part of EXT_gpu_shader4 - as such it should have been supported
by glsl 130.
It was however forgotten, and not added until glsl 430 - with the wrong
syntax no less (glsl 430 mentions it was overlooked).
glsl 440 (but revision 8 only) fixed this finally for good.
At least nvidia supports this with just version glsl version 1.30 as well
(the spec doesn't explicitly say it should be supported retroactively),
so just add this to the other glsl 130 textureOffset functions.

Passes a (hacked) piglit tex-miplevel-selection test (2DArrayShadow
textureOffset -auto) with llvmpipe.

v2: fix up comment (by Ian), add testing to commit message.

Reviewed-by: Dave Airlie <airlied@gmail.com>

diff --git a/src/compiler/glsl/builtin_functions.cpp b/src/compiler/glsl/builtin_functions.cpp
index 1f6fb22924bd165372cb7cedb9d069b217c878eb..25d914dfb1c6bf5466baf185ef15c31a02b540d6 100644 (file)
--- a/src/compiler/glsl/builtin_functions.cpp
+++ b/src/compiler/glsl/builtin_functions.cpp
@@ -1756,6 +1756,13 @@ builtin_builder::create_builtins()
                 _texture(ir_tex, v130, glsl_type::uvec4_type, glsl_type::usampler2DArray_type, glsl_type::vec3_type, TEX_OFFSET),
 
                 _texture(ir_tex, v130, glsl_type::float_type, glsl_type::sampler1DArrayShadow_type, glsl_type::vec3_type, TEX_OFFSET),
+                /* The next one was forgotten in GLSL 1.30 spec. It's from
+                 * EXT_gpu_shader4 originally. It was added in 4.30 with the
+                 * wrong syntax. This was corrected in 4.40. 4.30 indicates
+                 * that it was intended to be included previously, so allow it
+                 * in 1.30.
+                 */
+                _texture(ir_tex, v130, glsl_type::float_type, glsl_type::sampler2DArrayShadow_type, glsl_type::vec4_type, TEX_OFFSET),
 
                 _texture(ir_txb, v130_fs_only, glsl_type::vec4_type,  glsl_type::sampler1D_type,  glsl_type::float_type, TEX_OFFSET),
                 _texture(ir_txb, v130_fs_only, glsl_type::ivec4_type, glsl_type::isampler1D_type, glsl_type::float_type, TEX_OFFSET),