Re-implement GLSL texture sampler variables.

GLSL sampler variables indicate which texture unit to use for TEX instructions.
Previously, this was baked into the fragment/vertex program and couldn't be
readily changed once set.
Now, SamplerUnits[] array indicates which texture unit is to be used for
each sampler variable.  These values are set with glUniform1i().
This is extra state that must be passed to the fragment/vertex program
executor at runtime.

2 files changed, 15 insertions, 0 deletions

diff --git a/src/mesa/pipe/failover/fo_context.h b/src/mesa/pipe/failover/fo_context.h
index 7a59701..759b53c 100644
--- a/src/mesa/pipe/failover/fo_context.h
+++ b/src/mesa/pipe/failover/fo_context.h
@@ -84,6 +84,7 @@ struct failover_context {
    struct pipe_framebuffer_state framebuffer;
    struct pipe_poly_stipple poly_stipple;
    struct pipe_scissor_state scissor;
+   uint sampler_units[PIPE_MAX_SAMPLERS];
    struct pipe_mipmap_tree *texture[PIPE_MAX_SAMPLERS];
    struct pipe_viewport_state viewport;
    struct pipe_vertex_buffer vertex_buffer[PIPE_ATTRIB_MAX];
diff --git a/src/mesa/pipe/failover/fo_state.c b/src/mesa/pipe/failover/fo_state.c
index f63137f..2cd1a50 100644
--- a/src/mesa/pipe/failover/fo_state.c
+++ b/src/mesa/pipe/failover/fo_state.c
@@ -294,6 +294,19 @@ failover_set_polygon_stipple( struct pipe_context *pipe,
    failover->hw->set_polygon_stipple( failover->hw, stipple );
 }
 
+static void
+failover_set_sampler_units( struct pipe_context *pipe,
+                            uint num_samplers, const uint *units )
+{
+   struct failover_context *failover = failover_context(pipe);
+   uint i;
+
+   for (i = 0; i < num_samplers; i++)
+      failover->sampler_units[i] = units[i];
+   failover->dirty |= FO_NEW_SAMPLER;
+   failover->hw->set_sampler_units(failover->hw, num_samplers, units);
+}
+
 static void *
 failover_create_rasterizer_state(struct pipe_context *pipe,
                                  const struct pipe_rasterizer_state *templ)
@@ -470,6 +483,7 @@ failover_init_state_functions( struct failover_context *failover )
    failover->pipe.set_clear_color_state = failover_set_clear_color_state;
    failover->pipe.set_framebuffer_state = failover_set_framebuffer_state;
    failover->pipe.set_polygon_stipple = failover_set_polygon_stipple;
+   failover->pipe.set_sampler_units = failover_set_sampler_units;
    failover->pipe.set_scissor_state = failover_set_scissor_state;
    failover->pipe.set_texture_state = failover_set_texture_state;
    failover->pipe.set_viewport_state = failover_set_viewport_state;