[Mesa-dev] [PATCH 4/4] st/mesa: advertise ARB_shading_language_packing for GLSL >= 1.30

[Marek Olšák]

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

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 6d556a2..f612b99 100644
--- a/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
+++ b/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
@@ -5153,6 +5153,21 @@ 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 |
-- 
1.7.10.4