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.

5 files changed, 20 insertions, 0 deletions

diff --git a/src/mesa/pipe/softpipe/sp_context.c b/src/mesa/pipe/softpipe/sp_context.c
index 476d4ac01c..58ef744f30 100644
--- a/src/mesa/pipe/softpipe/sp_context.c
+++ b/src/mesa/pipe/softpipe/sp_context.c
@@ -318,6 +318,7 @@ struct pipe_context *softpipe_create( struct pipe_winsys *pipe_winsys,
    softpipe->pipe.set_feedback_state = softpipe_set_feedback_state;
    softpipe->pipe.set_framebuffer_state = softpipe_set_framebuffer_state;
    softpipe->pipe.set_polygon_stipple = softpipe_set_polygon_stipple;
+   softpipe->pipe.set_sampler_units = softpipe_set_sampler_units;
    softpipe->pipe.set_scissor_state = softpipe_set_scissor_state;
    softpipe->pipe.set_texture_state = softpipe_set_texture_state;
    softpipe->pipe.set_viewport_state = softpipe_set_viewport_state;
diff --git a/src/mesa/pipe/softpipe/sp_context.h b/src/mesa/pipe/softpipe/sp_context.h
index 3e77bd6b85..88a418d3c7 100644
--- a/src/mesa/pipe/softpipe/sp_context.h
+++ b/src/mesa/pipe/softpipe/sp_context.h
@@ -95,6 +95,7 @@ struct softpipe_context {
    struct pipe_viewport_state viewport;
    struct pipe_vertex_buffer vertex_buffer[PIPE_ATTRIB_MAX];
    struct pipe_vertex_element vertex_element[PIPE_ATTRIB_MAX];
+   uint sampler_units[PIPE_MAX_SAMPLERS];
    unsigned dirty;
 
    /*
diff --git a/src/mesa/pipe/softpipe/sp_quad_fs.c b/src/mesa/pipe/softpipe/sp_quad_fs.c
index 3371b109fc..9b9504cd15 100644
--- a/src/mesa/pipe/softpipe/sp_quad_fs.c
+++ b/src/mesa/pipe/softpipe/sp_quad_fs.c
@@ -85,6 +85,7 @@ shade_quad(
    /* Consts does not require 16 byte alignment. */
    machine->Consts = softpipe->mapped_constants[PIPE_SHADER_FRAGMENT];
 
+   machine->SamplerUnits = softpipe->sampler_units;
    machine->InterpCoefs = quad->coef;
 
    machine->Inputs[0].xyzw[0].f[0] = fx;
diff --git a/src/mesa/pipe/softpipe/sp_state.h b/src/mesa/pipe/softpipe/sp_state.h
index c194f0ea0d..61532bcdeb 100644
--- a/src/mesa/pipe/softpipe/sp_state.h
+++ b/src/mesa/pipe/softpipe/sp_state.h
@@ -99,6 +99,9 @@ void softpipe_delete_vs_state(struct pipe_context *, void *);
 void softpipe_set_polygon_stipple( struct pipe_context *,
 				  const struct pipe_poly_stipple * );
 
+void softpipe_set_sampler_units( struct pipe_context *,
+                                 uint numSamplers, const uint *units );
+
 void softpipe_set_scissor_state( struct pipe_context *,
                                  const struct pipe_scissor_state * );
 
diff --git a/src/mesa/pipe/softpipe/sp_state_sampler.c b/src/mesa/pipe/softpipe/sp_state_sampler.c
index c00e815f2d..e70eabd578 100644
--- a/src/mesa/pipe/softpipe/sp_state_sampler.c
+++ b/src/mesa/pipe/softpipe/sp_state_sampler.c
@@ -78,3 +78,17 @@ softpipe_set_texture_state(struct pipe_context *pipe,
 
    softpipe->dirty |= SP_NEW_TEXTURE;
 }
+
+
+void
+softpipe_set_sampler_units(struct pipe_context *pipe,
+                           uint num_samplers, const uint *units )
+{
+   struct softpipe_context *softpipe = softpipe_context(pipe);
+   uint i;
+   for (i = 0; i < num_samplers; i++)
+      softpipe->sampler_units[i] = units[i];
+   softpipe->dirty |= SP_NEW_SAMPLER;
+}
+
+