mesa: Add fallback from RGB_FLOAT16 to RGBA_FLOAT16 before RGBA_FLOAT32.

Not all i965 hardware can do RGB float16, and this will at least save
half the memory and have expected behavior in terms of precision.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

diff --git a/src/mesa/main/texformat.c b/src/mesa/main/texformat.c
index aebe38ee0bfb5c94bdabe2ce3aacc68872363e7a..38571b837605f8699e1c9ff6019162d0fa40a30c 100644 (file)
--- a/src/mesa/main/texformat.c
+++ b/src/mesa/main/texformat.c
@@ -356,6 +356,7 @@ _mesa_choose_tex_format( struct gl_context *ctx, GLint internalFormat,
            break;
          case GL_RGB16F_ARB:
            RETURN_IF_SUPPORTED(MESA_FORMAT_RGB_FLOAT16);
+           RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT16);
            RETURN_IF_SUPPORTED(MESA_FORMAT_RGB_FLOAT32);
            RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
            break;