_mesa_meta_GenerateMipmap: Support all texture targets by generating shaders at runtime

glsl path of _mesa_meta_GenerateMipmap() function would require different fragment
shaders depending on the texture target. This patch adds the code to generate
appropriate fragment shader programs at run time.
Fixes https://bugs.freedesktop.org/show_bug.cgi?id=54296

V2: Removed the code for integer textures as ARB is planning to
    disallow automatic mipmap generation for integer textures.
    Now using ralloc_asprintf in setup_glsl_generate_mipmap().

NOTE: This is a candidate for stable branches.

Signed-off-by: Anuj Phogat <[email protected]>
Reviewed-by: Brian Paul <[email protected]>

1 files changed, 2 insertions, 0 deletions

diff --git a/src/mesa/drivers/common/meta.h b/src/mesa/drivers/common/meta.h
index d8dfb56f9b1..8a6b33b3235 100644
--- a/src/mesa/drivers/common/meta.h
+++ b/src/mesa/drivers/common/meta.h
@@ -58,6 +58,8 @@
 #define MESA_META_MULTISAMPLE          0x100000
 /**\}*/
 
+void *mem_ctx;
+
 extern void
 _mesa_meta_init(struct gl_context *ctx);