i965: Force border color A to 1 when it's not present in the GL format.

It's usually forced to 1 by the surface format, but sometimes we actually have
alpha present because it's the only format available.

Fixes piglit texwrap bordercolor tests for OpenGL 1.1, GL_EXT_texture_sRGB and
GL_ARB_texture_float.

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

diff --git a/src/mesa/drivers/dri/i965/brw_wm_sampler_state.c b/src/mesa/drivers/dri/i965/brw_wm_sampler_state.c
index e51381b855fe1efa02096f454ff58b643d4477cf..fb9cb83c7bc4ee9a72fc1f30fe0b48588f5c229b 100644 (file)
--- a/src/mesa/drivers/dri/i965/brw_wm_sampler_state.c
+++ b/src/mesa/drivers/dri/i965/brw_wm_sampler_state.c
@@ -105,6 +105,13 @@ upload_default_color(struct brw_context *brw, struct gl_sampler_object *sampler,
       color[3] = sampler->BorderColor.f[3];
    }
 
+   /* In some cases we use an RGBA surface format for GL RGB textures,
+    * where we've initialized the A channel to 1.0.  We also have to set
+    * the border color alpha to 1.0 in that case.
+    */
+   if (firstImage->_BaseFormat == GL_RGB)
+      color[3] = 1.0;
+
    if (intel->gen == 5 || intel->gen == 6) {
       struct gen5_sampler_default_color *sdc;