svga: rename "tex_usage" to "bindings", add comments

Trivial.

diff --git a/src/gallium/drivers/svga/svga_screen.c b/src/gallium/drivers/svga/svga_screen.c
index 12ea4af824f94353ff9d7bbab057a3c91b5d1f9b..32eec038adaa48932f92b99545e5a72759378678 100644 (file)
--- a/src/gallium/drivers/svga/svga_screen.c
+++ b/src/gallium/drivers/svga/svga_screen.c
@@ -402,25 +402,29 @@ static int svga_get_shader_param(struct pipe_screen *screen, unsigned shader, en
 }
 
 
+/**
+ * Implemnt pipe_screen::is_format_supported().
+ * \param bindings  bitmask of PIPE_BIND_x flags
+ */
 static boolean
 svga_is_format_supported( struct pipe_screen *screen,
                           enum pipe_format format,
                           enum pipe_texture_target target,
                           unsigned sample_count,
-                          unsigned tex_usage)
+                          unsigned bindings)
 {
    struct svga_screen *ss = svga_screen(screen);
    SVGA3dSurfaceFormat svga_format;
    SVGA3dSurfaceFormatCaps caps;
    SVGA3dSurfaceFormatCaps mask;
 
-   assert(tex_usage);
+   assert(bindings);
 
    if (sample_count > 1) {
       return FALSE;
    }
 
-   svga_format = svga_translate_format(ss, format, tex_usage);
+   svga_format = svga_translate_format(ss, format, bindings);
    if (svga_format == SVGA3D_FORMAT_INVALID) {
       return FALSE;
    }
@@ -430,7 +434,7 @@ svga_is_format_supported( struct pipe_screen *screen,
     * visuals for all virtual hardware implementations.
     */
 
-   if (tex_usage & PIPE_BIND_DISPLAY_TARGET) {
+   if (bindings & PIPE_BIND_DISPLAY_TARGET) {
       switch (svga_format) {
       case SVGA3D_A8R8G8B8:
       case SVGA3D_X8R8G8B8:
@@ -456,13 +460,13 @@ svga_is_format_supported( struct pipe_screen *screen,
    svga_get_format_cap(ss, svga_format, &caps);
 
    mask.value = 0;
-   if (tex_usage & PIPE_BIND_RENDER_TARGET) {
+   if (bindings & PIPE_BIND_RENDER_TARGET) {
       mask.offscreenRenderTarget = 1;
    }
-   if (tex_usage & PIPE_BIND_DEPTH_STENCIL) {
+   if (bindings & PIPE_BIND_DEPTH_STENCIL) {
       mask.zStencil = 1;
    }
-   if (tex_usage & PIPE_BIND_SAMPLER_VIEW) {
+   if (bindings & PIPE_BIND_SAMPLER_VIEW) {
       mask.texture = 1;
    }