Mesa (master): st/mesa: advertise ARB_shading_language_packing for GLSL >= 1.30

[Marek Olšák]

Module: Mesa
Branch: master
Commit: 48689ca14a0a28aa03a54b5fa57ecca67d2da051
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=48689ca14a0a28aa03a54b5fa57ecca67d2da051

Author: Marek Olšák <maraeo at gmail.com>
Date:   Thu Jan 31 23:52:14 2013 +0100

st/mesa: advertise ARB_shading_language_packing for GLSL >= 1.30

Reviewed-by: Brian Paul <brianp at vmware.com>

---

 src/mesa/state_tracker/st_extensions.c     |    1 +
 src/mesa/state_tracker/st_glsl_to_tgsi.cpp |   15 +++++++++++++++
 2 files changed, 16 insertions(+), 0 deletions(-)

diff --git a/src/mesa/state_tracker/st_extensions.c b/src/mesa/state_tracker/st_extensions.c
index 214588f..4d2d43d 100644
--- a/src/mesa/state_tracker/st_extensions.c
+++ b/src/mesa/state_tracker/st_extensions.c
@@ -597,6 +597,7 @@ void st_init_extensions(struct st_context *st)
       /* Extensions that either depend on GLSL 1.30 or are a subset thereof. */
       ctx->Extensions.ARB_conservative_depth = GL_TRUE;
       ctx->Extensions.ARB_shader_bit_encoding = GL_TRUE;
+      ctx->Extensions.ARB_shading_language_packing = GL_TRUE;
       ctx->Extensions.OES_depth_texture_cube_map = GL_TRUE;
    } else {
       /* Optional integer support for GLSL 1.2. */
diff --git a/src/mesa/state_tracker/st_glsl_to_tgsi.cpp b/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
index 3e9ff80..b20dfd5 100644
--- a/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
+++ b/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
@@ -5167,6 +5167,21 @@ st_link_shader(struct gl_context *ctx, struct gl_shader_program *prog)
                                              options->EmitNoIndirectUniform);
       }
 
+      if (ctx->Extensions.ARB_shading_language_packing) {
+         unsigned lower_inst = LOWER_PACK_SNORM_2x16 |
+                               LOWER_UNPACK_SNORM_2x16 |
+                               LOWER_PACK_UNORM_2x16 |
+                               LOWER_UNPACK_UNORM_2x16 |
+                               LOWER_PACK_SNORM_4x8 |
+                               LOWER_UNPACK_SNORM_4x8 |
+                               LOWER_UNPACK_UNORM_4x8 |
+                               LOWER_PACK_UNORM_4x8 |
+                               LOWER_PACK_HALF_2x16 |
+                               LOWER_UNPACK_HALF_2x16;
+
+         lower_packing_builtins(ir, lower_inst);
+      }
+
       do_mat_op_to_vec(ir);
       lower_instructions(ir,
                          MOD_TO_FRACT |