gallium: Introduce separate vertex texture/sampler state.

Previously, gallium shared sampler and texture state between vertex
and fragment shader stages. This change generalises this concept by
providing separate entrypoints for vertex and fragment sampler state
setting.

A new capability bit is added to query the driver for the number
of samplers that can be utilised by a vertex and fragment shader
at the same time.

3 files changed, 16 insertions, 4 deletions

diff --git a/src/gallium/include/pipe/p_context.h b/src/gallium/include/pipe/p_context.h
index 5569001e60..f896001eb1 100644
--- a/src/gallium/include/pipe/p_context.h
+++ b/src/gallium/include/pipe/p_context.h
@@ -123,7 +123,12 @@ struct pipe_context {
 
    void * (*create_sampler_state)(struct pipe_context *,
                                   const struct pipe_sampler_state *);
-   void   (*bind_sampler_states)(struct pipe_context *, unsigned num, void **);
+   void   (*bind_fragment_sampler_states)(struct pipe_context *,
+                                          unsigned num_samplers,
+                                          void **samplers);
+   void   (*bind_vertex_sampler_states)(struct pipe_context *,
+                                        unsigned num_samplers,
+                                        void **samplers);
    void   (*delete_sampler_state)(struct pipe_context *, void *);
 
    void * (*create_rasterizer_state)(struct pipe_context *,
@@ -173,9 +178,13 @@ struct pipe_context {
    void (*set_viewport_state)( struct pipe_context *,
                                const struct pipe_viewport_state * );
 
-   void (*set_sampler_textures)( struct pipe_context *,
-                                 unsigned num_textures,
-                                 struct pipe_texture ** );
+   void (*set_fragment_sampler_textures)(struct pipe_context *,
+                                         unsigned num_textures,
+                                         struct pipe_texture **);
+
+   void (*set_vertex_sampler_textures)(struct pipe_context *,
+                                       unsigned num_textures,
+                                       struct pipe_texture **);
 
    void (*set_vertex_buffers)( struct pipe_context *,
                                unsigned num_buffers,
diff --git a/src/gallium/include/pipe/p_defines.h b/src/gallium/include/pipe/p_defines.h
index fd14dc8e92..69a0970d5f 100644
--- a/src/gallium/include/pipe/p_defines.h
+++ b/src/gallium/include/pipe/p_defines.h
@@ -390,6 +390,8 @@ enum pipe_transfer_usage {
 #define PIPE_CAP_BLEND_EQUATION_SEPARATE 28
 #define PIPE_CAP_SM3                     29  /*< Shader Model 3 supported */
 #define PIPE_CAP_MAX_PREDICATE_REGISTERS 30
+#define PIPE_CAP_MAX_COMBINED_SAMPLERS   31  /*< Maximum texture image units accessible from vertex
+                                                 and fragment shaders combined */
 
 
 /**
diff --git a/src/gallium/include/pipe/p_state.h b/src/gallium/include/pipe/p_state.h
index 9766e86620..6de7af6a81 100644
--- a/src/gallium/include/pipe/p_state.h
+++ b/src/gallium/include/pipe/p_state.h
@@ -60,6 +60,7 @@ extern "C" {
 #define PIPE_MAX_COLOR_BUFS        8
 #define PIPE_MAX_CONSTANT         32
 #define PIPE_MAX_SAMPLERS         16
+#define PIPE_MAX_VERTEX_SAMPLERS  16
 #define PIPE_MAX_SHADER_INPUTS    16
 #define PIPE_MAX_SHADER_OUTPUTS   16
 #define PIPE_MAX_TEXTURE_LEVELS   16