+/**
+ * Given a gallium vertex element format, return the corresponding SVGA3D
+ * format. Return SVGA3D_DECLTYPE_MAX for unsupported gallium formats.
+ */
+static SVGA3dDeclType
+translate_vertex_format(enum pipe_format format)
+{
+ switch (format) {
+ case PIPE_FORMAT_R32_FLOAT: return SVGA3D_DECLTYPE_FLOAT1;
+ case PIPE_FORMAT_R32G32_FLOAT: return SVGA3D_DECLTYPE_FLOAT2;
+ case PIPE_FORMAT_R32G32B32_FLOAT: return SVGA3D_DECLTYPE_FLOAT3;
+ case PIPE_FORMAT_R32G32B32A32_FLOAT: return SVGA3D_DECLTYPE_FLOAT4;
+ case PIPE_FORMAT_B8G8R8A8_UNORM: return SVGA3D_DECLTYPE_D3DCOLOR;
+ case PIPE_FORMAT_R8G8B8A8_USCALED: return SVGA3D_DECLTYPE_UBYTE4;
+ case PIPE_FORMAT_R16G16_SSCALED: return SVGA3D_DECLTYPE_SHORT2;
+ case PIPE_FORMAT_R16G16B16A16_SSCALED: return SVGA3D_DECLTYPE_SHORT4;
+ case PIPE_FORMAT_R8G8B8A8_UNORM: return SVGA3D_DECLTYPE_UBYTE4N;
+ case PIPE_FORMAT_R16G16_SNORM: return SVGA3D_DECLTYPE_SHORT2N;
+ case PIPE_FORMAT_R16G16B16A16_SNORM: return SVGA3D_DECLTYPE_SHORT4N;
+ case PIPE_FORMAT_R16G16_UNORM: return SVGA3D_DECLTYPE_USHORT2N;
+ case PIPE_FORMAT_R16G16B16A16_UNORM: return SVGA3D_DECLTYPE_USHORT4N;
+ case PIPE_FORMAT_R10G10B10X2_USCALED: return SVGA3D_DECLTYPE_UDEC3;
+ case PIPE_FORMAT_R10G10B10X2_SNORM: return SVGA3D_DECLTYPE_DEC3N;
+ case PIPE_FORMAT_R16G16_FLOAT: return SVGA3D_DECLTYPE_FLOAT16_2;
+ case PIPE_FORMAT_R16G16B16A16_FLOAT: return SVGA3D_DECLTYPE_FLOAT16_4;
+
+ /* See attrib_needs_adjustment() and attrib_needs_w_to_1() below */
+ case PIPE_FORMAT_R8G8B8_SNORM: return SVGA3D_DECLTYPE_UBYTE4N;
+
+ /* See attrib_needs_w_to_1() below */
+ case PIPE_FORMAT_R16G16B16_SNORM: return SVGA3D_DECLTYPE_SHORT4N;
+ case PIPE_FORMAT_R16G16B16_UNORM: return SVGA3D_DECLTYPE_USHORT4N;
+ case PIPE_FORMAT_R8G8B8_UNORM: return SVGA3D_DECLTYPE_UBYTE4N;
+
+ default:
+ /* There are many formats without hardware support. This case
+ * will be hit regularly, meaning we'll need swvfetch.
+ */
+ return SVGA3D_DECLTYPE_MAX;
+ }
+}
+
+
+/**
+ * Does the given vertex attrib format need range adjustment in the VS?
+ * Range adjustment scales and biases values from [0,1] to [-1,1].
+ * This lets us avoid the swtnl path.
+ */
+static boolean
+attrib_needs_range_adjustment(enum pipe_format format)
+{
+ switch (format) {
+ case PIPE_FORMAT_R8G8B8_SNORM:
+ return TRUE;
+ default:
+ return FALSE;
+ }
+}
+
+
+/**
+ * Does the given vertex attrib format need to have the W component set
+ * to one in the VS?
+ */
+static boolean
+attrib_needs_w_to_1(enum pipe_format format)
+{
+ switch (format) {
+ case PIPE_FORMAT_R8G8B8_SNORM:
+ case PIPE_FORMAT_R8G8B8_UNORM:
+ case PIPE_FORMAT_R16G16B16_SNORM:
+ case PIPE_FORMAT_R16G16B16_UNORM:
+ return TRUE;
+ default:
+ return FALSE;
+ }
+}
+
+