mesa: GL_EXT_texture_norm16 extension plumbing

Patch enables use of short and unsigned short data for texture uploads,
rendering and reading of framebuffers within the restrictions specified
in GL_EXT_texture_norm16 spec.

Patch also enables those 16bit format layout qualifiers listed in
GL_NV_image_formats that depend on EXT_texture_norm16.

v2: expose extension with dummy_true
    fix layout qualifier map changes (Ilia Mirkin)

v3: use _mesa_has_EXT_texture_norm16, other fixes
    and cleanup (Ilia Mirkin)

v4: fix rest of the issues found

Signed-off-by: Tapani Pälli <[email protected]>
Acked-by: Ilia Mirkin <[email protected]>
Reviewed-by: Kenneth Graunke <[email protected]>

1 files changed, 3 insertions, 4 deletions

diff --git a/src/mesa/main/shaderimage.c b/src/mesa/main/shaderimage.c
index 596eadd4f85..feff8ccd916 100644
--- a/src/mesa/main/shaderimage.c
+++ b/src/mesa/main/shaderimage.c
@@ -430,9 +430,8 @@ _mesa_is_shader_image_format_supported(const struct gl_context *ctx,
     * ARB_shader_image_load_store extension, c.f. table 3.21 of the OpenGL 4.2
     * specification.
     *
-    * These can be supported by GLES 3.1 with GL_NV_image_formats &
-    * GL_EXT_texture_norm16 extensions but we don't have support for the
-    * latter in Mesa yet.
+    * Following formats are supported by GLES 3.1 with GL_NV_image_formats &
+    * GL_EXT_texture_norm16 extensions.
     */
    case GL_RGBA16:
    case GL_RGBA16_SNORM:
@@ -440,7 +439,7 @@ _mesa_is_shader_image_format_supported(const struct gl_context *ctx,
    case GL_RG16_SNORM:
    case GL_R16:
    case GL_R16_SNORM:
-      return _mesa_is_desktop_gl(ctx);
+      return _mesa_is_desktop_gl(ctx) || _mesa_has_EXT_texture_norm16(ctx);
 
    default:
       return false;