glsl: Add gl_shader_program::UniformLocationBaseScale

This is used by _mesa_uniform_merge_location_offset and
_mesa_uniform_split_location_offset to determine how the base and offset
are packed.  Previously, this value was hard coded as (1U<<16) in those
functions via the shift and mask contained therein.  The value is still
(1U<<16), but it can be changed in the future.

The next patch dynamically generates this value.

NOTE: This is a candidate for stable release branches.

Signed-off-by: Ian Romanick <[email protected]>
Reviewed-by: Brian Paul <[email protected]>
Reviewed-and-tested-by: Chad Versace <[email protected]>

1 files changed, 5 insertions, 3 deletions

diff --git a/src/mesa/main/uniforms.h b/src/mesa/main/uniforms.h
index d718b0f12e3..14fe26d5fde 100644
--- a/src/mesa/main/uniforms.h
+++ b/src/mesa/main/uniforms.h
@@ -272,7 +272,9 @@ static inline GLint
 _mesa_uniform_merge_location_offset(const struct gl_shader_program *prog,
                                     unsigned base_location, unsigned offset)
 {
-   return (base_location << 16) | offset;
+   assert(prog->UniformLocationBaseScale >= 0);
+   assert(offset < prog->UniformLocationBaseScale);
+   return (base_location * prog->UniformLocationBaseScale) + offset;
 }
 
 /**
@@ -283,8 +285,8 @@ _mesa_uniform_split_location_offset(const struct gl_shader_program *prog,
                                     GLint location, unsigned *base_location,
 				    unsigned *offset)
 {
-   *offset = location & 0xffff;
-   *base_location = location >> 16;
+   *offset = location % prog->UniformLocationBaseScale;
+   *base_location = location / prog->UniformLocationBaseScale;
 }
 /*@}*/