compositor: handle YUV buffers.

Signed-off-by: Gwenole Beauchesne <gwenole.beauchesne@intel.com>
diff --git a/src/compositor-wayland.c b/src/compositor-wayland.c
index c2a84c4..a0397ad 100644
--- a/src/compositor-wayland.c
+++ b/src/compositor-wayland.c
@@ -188,7 +188,7 @@
 	glUniformMatrix4fv(shader->proj_uniform,
 			   1, GL_FALSE, output->base.matrix.d);
 
-	glUniform1i(shader->tex_uniform, 0);
+	glUniform1i(shader->tex_uniforms[0], 0);
 	glUniform1f(shader->alpha_uniform, 1);
 	glUniform1f(shader->texwidth_uniform, 1);